CA2525999A1 - Electromagnetic radiation transparent device and method of making thereof - Google Patents

Electromagnetic radiation transparent device and method of making thereof Download PDF

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Publication number
CA2525999A1
CA2525999A1 CA002525999A CA2525999A CA2525999A1 CA 2525999 A1 CA2525999 A1 CA 2525999A1 CA 002525999 A CA002525999 A CA 002525999A CA 2525999 A CA2525999 A CA 2525999A CA 2525999 A1 CA2525999 A1 CA 2525999A1
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Canada
Prior art keywords
pattern
electrically conductive
conductive material
medical stent
medical
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Abandoned
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CA002525999A
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French (fr)
Inventor
Robert W. Gray
Stuart G. Mcdonald
Jeffrey L. Helfer
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Biophan Technologies Inc
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Individual
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    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61BDIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B5/00Measuring for diagnostic purposes; Identification of persons
    • A61B5/02Detecting, measuring or recording pulse, heart rate, blood pressure or blood flow; Combined pulse/heart-rate/blood pressure determination; Evaluating a cardiovascular condition not otherwise provided for, e.g. using combinations of techniques provided for in this group with electrocardiography or electroauscultation; Heart catheters for measuring blood pressure
    • A61B5/02007Evaluating blood vessel condition, e.g. elasticity, compliance
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61FFILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2/00Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/82Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/86Stents in a form characterised by the wire-like elements; Stents in the form characterised by a net-like or mesh-like structure
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61FFILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2/00Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/82Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/86Stents in a form characterised by the wire-like elements; Stents in the form characterised by a net-like or mesh-like structure
    • A61F2/90Stents in a form characterised by the wire-like elements; Stents in the form characterised by a net-like or mesh-like structure characterised by a net-like or mesh-like structure
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61FFILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2/00Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/82Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/86Stents in a form characterised by the wire-like elements; Stents in the form characterised by a net-like or mesh-like structure
    • A61F2/90Stents in a form characterised by the wire-like elements; Stents in the form characterised by a net-like or mesh-like structure characterised by a net-like or mesh-like structure
    • A61F2/91Stents in a form characterised by the wire-like elements; Stents in the form characterised by a net-like or mesh-like structure characterised by a net-like or mesh-like structure made from perforated sheet material or tubes, e.g. perforated by laser cuts or etched holes
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61LMETHODS OR APPARATUS FOR STERILISING MATERIALS OR OBJECTS IN GENERAL; DISINFECTION, STERILISATION OR DEODORISATION OF AIR; CHEMICAL ASPECTS OF BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES; MATERIALS FOR BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES
    • A61L31/00Materials for other surgical articles, e.g. stents, stent-grafts, shunts, surgical drapes, guide wires, materials for adhesion prevention, occluding devices, surgical gloves, tissue fixation devices
    • A61L31/02Inorganic materials
    • A61L31/022Metals or alloys
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61LMETHODS OR APPARATUS FOR STERILISING MATERIALS OR OBJECTS IN GENERAL; DISINFECTION, STERILISATION OR DEODORISATION OF AIR; CHEMICAL ASPECTS OF BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES; MATERIALS FOR BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES
    • A61L31/00Materials for other surgical articles, e.g. stents, stent-grafts, shunts, surgical drapes, guide wires, materials for adhesion prevention, occluding devices, surgical gloves, tissue fixation devices
    • A61L31/12Composite materials, i.e. containing one material dispersed in a matrix of the same or different material
    • A61L31/121Composite materials, i.e. containing one material dispersed in a matrix of the same or different material having an inorganic matrix
    • A61L31/124Composite materials, i.e. containing one material dispersed in a matrix of the same or different material having an inorganic matrix of other specific inorganic materials not covered by A61L31/122 or A61L31/123
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61LMETHODS OR APPARATUS FOR STERILISING MATERIALS OR OBJECTS IN GENERAL; DISINFECTION, STERILISATION OR DEODORISATION OF AIR; CHEMICAL ASPECTS OF BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES; MATERIALS FOR BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES
    • A61L31/00Materials for other surgical articles, e.g. stents, stent-grafts, shunts, surgical drapes, guide wires, materials for adhesion prevention, occluding devices, surgical gloves, tissue fixation devices
    • A61L31/14Materials characterised by their function or physical properties, e.g. injectable or lubricating compositions, shape-memory materials, surface modified materials
    • A61L31/18Materials at least partially X-ray or laser opaque
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01RMEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R33/00Arrangements or instruments for measuring magnetic variables
    • G01R33/20Arrangements or instruments for measuring magnetic variables involving magnetic resonance
    • G01R33/28Details of apparatus provided for in groups G01R33/44 - G01R33/64
    • G01R33/285Invasive instruments, e.g. catheters or biopsy needles, specially adapted for tracking, guiding or visualization by NMR
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61BDIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B90/00Instruments, implements or accessories specially adapted for surgery or diagnosis and not covered by any of the groups A61B1/00 - A61B50/00, e.g. for luxation treatment or for protecting wound edges
    • A61B90/36Image-producing devices or illumination devices not otherwise provided for
    • A61B90/37Surgical systems with images on a monitor during operation
    • A61B2090/374NMR or MRI
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61BDIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B5/00Measuring for diagnostic purposes; Identification of persons
    • A61B5/05Detecting, measuring or recording for diagnosis by means of electric currents or magnetic fields; Measuring using microwaves or radio waves 
    • A61B5/055Detecting, measuring or recording for diagnosis by means of electric currents or magnetic fields; Measuring using microwaves or radio waves  involving electronic [EMR] or nuclear [NMR] magnetic resonance, e.g. magnetic resonance imaging
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61FFILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2210/00Particular material properties of prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof
    • A61F2210/009Particular material properties of prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof magnetic
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61FFILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2220/00Fixations or connections for prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof
    • A61F2220/0008Fixation appliances for connecting prostheses to the body
    • A61F2220/0016Fixation appliances for connecting prostheses to the body with sharp anchoring protrusions, e.g. barbs, pins, spikes
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61NELECTROTHERAPY; MAGNETOTHERAPY; RADIATION THERAPY; ULTRASOUND THERAPY
    • A61N1/00Electrotherapy; Circuits therefor
    • A61N1/16Screening or neutralising undesirable influences from or using, atmospheric or terrestrial radiation or fields
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61NELECTROTHERAPY; MAGNETOTHERAPY; RADIATION THERAPY; ULTRASOUND THERAPY
    • A61N2/00Magnetotherapy

Abstract

A medical device includes a pattern of electrically conductive material. The pattern of electrically conductive material has an anti-antenna geometrical shape such that the anti-antenna geometrical shape substantially prevents the medical device from creating an imaging artifact and/or substantially allows imaging of a volume within the medical device. The pattern may be formed by multiple "figure-8" shaped electrical conductors, multiple "figure-8"
emulating electrical conductors, multiple sine-wave-like shaped electrical conductors, multiple zig-zag patterned electrical conductors, by multiple electrical conductors, each having sequential conductive loops, and/or a single conductor weaved into a loop mesh. The electrically conductive material may be titanium, tantalum, nitinol, stainless steel, and/or NbZr.

Description

ELECTROMAGNETIC RADIATION TRANSPARENT DEVICE AND
METHOD OF MAKING THEREOF
TECHNICAL FIELD
[0001] The present invention is directed to scent designs, deployment devices for scents, and the fabrications thereof. More particularly, the present invention is directed to scents which produce little or no magnetic resonance image artifacts and the fabrications thereof.
BACKGROUND ART
[0002] The use of scents as a medical corrective and preventive device is well mown.
[0003] For example, United States Patent 5,133,732 discloses that a scent can be implanted into a body vessel. The stmt is a cylindrical body formed by a coiled generally continuous wire with a deformable zig-zag structure. The stem is further provided with means for preventing the stmt body from stretching along its longitudinal axis. This scent is especially useful when implanting very long stems by means of balloon expansion. The entire content of United States Patent 5,133,732 is hereby incorporated by reference.
[0004] In another example, United Slates Patent 5,507,767 discloses that a self expanding endovascular stmt is formed of stainess steel wire which is bent into an elongated zigzag pattern. The zigzag pattern has a plurality of substantially straight wire sections of various lengths separating a plurality of bends. The zigzag pattern is helically wound about a central alts to define a tubular shape such that a majority of the bends is disposed in a helix.
Adjacent bends in the helix are interconnected with a filament. The entire content of United States Patent S,SU7,767 is hereby incorporated by reference.
[0005] Magnetic resonance imaging ("MRI") has been developed as an imaging technique adapted to obtain both images of anatomical features of human patients as well as some aspects of the functional activities and characteristics of biological tissue. These images have medical diagnostic value in determining the state of the health of the tissue examined.
Unlike the situation with fluoroscopic imaging, a patient undergoing magnetic resonance imaging procedure may remain in the active imaging system for a significant amomt of time, e.g. a half hour or more, without suffering any adverse effects.
[0006] In an MRI process, a patient is typically aligned to place the portion of the patient's anatomy to be examined in the imaging volume of the MR1 apparatus.
Such an MRI
apparatus typically comprises a primary electromagnet for supplying a constant magnetic field (Bo) which, by convention, is along the z-axis and is substantially homogeneous over the imaging volume and secondary electromagnets that cm provide linear magnetic field gradients along each of three principal Cartesian a<~es in space (generally x, y, and z, or xl, Yz and ~;, respectively). The MRI apparatus also comprises one or more RF (radio frequency) coils which provide excitation and detection of the MRI induced signals in the patient's body.
[0007] The gradient fields are switched ON and OFF at different rates depending on the MRI scan sequence used. In some cases, this may result in a changing magnetic field on the order of dB/dt = 50 T/s. The frequency that a gradient field may be turned ON
can be between 200Hz to about 3001iIiz.
[0008] Uniformity in the static magnetic Bo field over the imaging volume is important for image clarity. When the field is not iuuform, image distortions called "image artifacts"
result. Additionally, if the gradient fields deviate significantly from their ideal linear character over the imaging volume, image artifacts develop.
[0009] Medical devices which are placed into a patient's body can cause the magnetic Melds of the MRI system to deviate from their preferred characteristics for clear imaging. If a medical device comprises metallic components (such as iron), image artifacts result due to the metal's magnetic susceptibility properties distorting the MRI system applied magnetic fields.
These are laiown as susceptibility artifacts. Additionally, if the medical device comprises conductive components, eddy currents develop in these conductive components when the MRI system's oscillating magnetic fields are applied. The eddy currents distort the net magnetic fields in the imaging volume, thereby providing another source for MR
imaging artifacts.
[0010] After a stmt is inserted into a patient, it is often desirable, over time, to determine if the scent is performing as expected. In the case, for elample, of deploying a stmt to correct a stenosis problem, it is desirable to detennuie if there is any indication of restenosis. This, as well as for other medical situations, requires obtaining images of the volume inside the stmt. Due to the image artifact problems, described above, inherent in metallic, conductive stems, it is not possible to obtain clear MR images of the interior vohune of the stems.
[0011] Attempts have been made to overcome these problems. The article.
"Ariifact-Free In-Stent Liunen Visualization by Standard Magnetic Resonance Angiography Using a New Metallic Magnetic Resonance Imaging Stent" by Arno Buecler, et al., Circulation, April 16, 2002, pp. 1772-1775, discloses that a handmade scent can enhance the imaging ability of the stmt's lumen. However, the handmade prototypes lacked a radial force comparable to standard stainless steel scents. Additionally, the article discloses the use of a contrasting agent to enhance visualization of the scent lumen.
[0012] The article "MR Imaging of Vascular Scents: Effects of Susceptibility, Flow, and Radiofrequency Eddy Currents" by Lamberius W. Bartels, et al., published in Journal of Vascular and Interventional Radiolo~,y, volume 12, Number 3, March 2001, pp.
3G5-371, describes the various image artifacts that prevent clear imaging of scent lumen.
[0013] The article "Improved Lumen Visualization in Metallic Vascular Implants by Reducing RF Artifacts" by Lainbertus W. Sanels, et al., published in Magnetic Resonance in Medicine, 74:171-180 (2002), describes attempts at imaging metallic stems lumen by using contrast agents and by increasing the power deposited into the patient during the MRl procedure. The power deposited into the patient body, measured as the Specific Absorption Rate (SAR) can be harmful to the patient undergoing an MRI if set too high. In addition to the higher power deposited into the patient, the article discloses that adjustments in the image reconstruction process need to be implemented.
[0014] Unted States Patent Application Publication US 2002/0188345 A1, published December 12, 2002, discloses an expandable metallic stmt that has discontinuities of non-conducting material. These eliminate electrically conducting paths in the stmt rings and cells. This makes the scent easier to image with magnetic resonance imaging (MRI). The entire content of United States Patent Application Publication US 2002/0188345 Al is hereby incorporated by reference.
[0015] WIPO PCT publication WO 03/015662 A1 discloses that a metallic endoproschesis causes no significant artifacts on images taken by magnetic resonance tomography (MRT), as a result of the combination of the production materials with a special design, which permits an evaluation of the externally adjacent region and the lumen of the endoprosthesis by means of MRT.
[OO1G] Although the above-described scents can be used to help a patient, these stems still cause magnetic resonance imaging artifacts. Moreover, the above-described scents prevent the imaging of the volume within the scent during magnetic resonance imaging.
[0017] Therefore, it is desirable to provide a stmt which produces little to no magnetic resonance imaging artifacts. Moreover, it is desirable to provide a scent that allows the imaging of the volume within the stmt. Furthermore, it is desirable to provide a stmt which produces little to no magnetic resonance imaging artifacts and/or allows the imaging oC the volume within the scent.
DISCLOSURE OF INVENTION
[0018] One aspect of the present invention is a medical stmt. The medical scent includes a pattern of electrically conductive material. The pattern of electrically conductive material has an anti-antenna geometrical shape such that the anti-antenna geometrical shape substantially prevents the medical stmt from creating an imaging artifact.
[0019] Another aspect of the present invention is a medical scent. The medical scent includes a pattern of electrically conductive material. The pattern of electrically conductive material has an anti-antenna geometrical shape such that the anti-antenna geometrical shape subst~.ntially allows imaging of a volume within the scent.
[0020] Another aspect of the present invention is a medical stmt. The medical stmt includes a pattern of electrically conductive material. The pattern of electrically conductive material leas an anti-antenna geometrical shape such that the anti-antenna geometrical shape substantially prevents the medical stmt from creating an imaging artifact and substantially allows imaging of a volume within the stmt.
[0021] Another aspect of the present invention is m electrically conductive structure.
The electrically conductive structure includes a pattern of electrically conductive material.
The pattern of electrically conductive material has an anti-antenna geometrical shape such that the anti-antenna geometrical shape substantially prevents creation of an imaging' artifact by the electrically conductive structure.
[0022] Another aspect of the present invention is a medical device. The medical device includes a pattern of electrically conductive material. The pattern of electrically conductive material has an anti-antenna geometrical shape such that the anti-antenna geometrical shape substantially prevents creation of an imaging artifact by the medical device.
[0023] Another aspect of the present invention is an electrically conductive structure.
The electrically conductive structure includes a pattern of electrically conductive material.
The pattern of electrically conductive material has an anti-antenna geometrical shape such that the anti-antenna geometrical shape substantially allows imaging of a volume within the electrically conductive structure.
[0024] Another aspect of the present invention is an electrically conductive structure.
The electrically conductive structure includes a pattern of electrically conductive material.
The pail:ern of electrically conductive material has an anti-antenna geometrical shape such that the anti-antenna geometrical shape subst~niially prevents creation of an imaging artifact by the medical device and substantially allows imaging of a volume within the electrically conductive structure.
[0025] Another aspect of the present invention is a medical device. The medical device includes a pattern of electrically conductive material. The pattern of electrically conductive material has an anti-antenna geometrical shape such that the anti-antenna geometrical shape substantially allows imaging of a volume within the medical device.

[0026] Another aspect of the present invention is a medical device. The medical device includes a pastern of electrically conductive material. The pattern of electrically conductive material has an anti-antenna geometrical shape such that the anti-antenna geometrical shape substantially prevents creation of an imaging artifact by the medical device and substantially allows imaging of a volume within the medical device.
[0027] Another aspect of the present invention is a medical stmt. The medical stmt includes a pattern of electrically conductive material. The pattern of electrically conductive material substantially prevents the medical stmt from creating an imaging artifact.
[0028] Another aspect of the present invention is a medical stmt. The medical scent includes a pai~tern of electrically conductive material. The pattern of electrically conductive material substantially allows imaging of a volume within the stmt.
[0029] Another aspect of the present invention is a medical stmt. The medical stmt includes a pattern of electrically conductive material. The pattern of electrically conductive material substantially prevents the medical stmt From creating an imaging artifact and substantially allows imaging of a volume within the scent.
[0030] Another aspect of the present invention is an electrically conductive structure.
The electrically conductive structure includes a pattern of electrically conductive material.
The pattern of electrically conductive material substantially prevents creation of an imaging artifact by the electrically conductive structure.
[0031] Another aspect of the present invention is a medical device. The medical device includes a pattern of electrically conductive material. The pattern of electrically conductive material substantially prevents creation of an imaging artifact by the medical device.
[0032] Another aspect of the present invention is an electrically conductive structure.
The electrically conductive structure includes a pattern of electrically conductive material.
The pattern of electrically conductive material substantially allows imaging of a volume within the electrically conductive structure.
[0033] Another aspect of the present invention is an electrically conductive structure.
The electrically conductive structure includes a pattern of electrically conductive material.
The pattern of electrically conductive material substantially prevents creation of an imaging artifact by the medical device and substantially allows imaging of a volume within the electrically conductive structure.
[0034] Another aspect of the present invention is a medical device. The medical device includes a pati;ern of electrically conductive material. The pattern of electrically conductive material substmtially allows imaging of a volume within the medical device.

(0035] Another aspect of the present invention is a medical device. The medical device includes a pattern of electrically conductive material. The pattern of electrically conductive material substantially prevents creation of an imaging artifact by the medical device and subsi~ntially allows imaging of a volume within the medical device.
[003G] Another aspect of the present invention is a medical stmt. The medical stmt includes a pattern of electrically conductive material. The pattern of electrically conductive material substantially prevents the medical scent from creating an imaging artifact. The electrically conductive material is shaped so as to be expandable, the expansion of the electrically conductive material causing an increase in a radius of the medical stmt.
[0037] Another aspect of the present invention is a medical stmt. The medical scent includes a pattern of electrically conductive material. The pattern of electrically conductive material substantially allows imaging of a volume within the stmt. The electrically conductive material is shaped so as to be expandable, the expansion of the electrically conductive material causing an increase in a radius of the medical stmt.
[0038] Another aspect of the present invention is a medical stmt. The medical stmt includes a pattern of electrically conductive material. The pattern of electrically conductive material subst~.ntially prevents the medical stmt from creating an imaging artifact and substantially allows imaging of a volume within the scent. The electrically conductive material is shaped so as to be expandable, the expansion of the electrically conductive material causing an increase in a radius of the medical scent.
[0039] Another aspect of the present invention is a medical stmt. The medical stmt includes a pattern of electrically conductive material. The pattern of electrically conductive material substantially prevents the medical stmt from creating an imaging artifact. The electrically conductive material is shaped so as to be expandable upon application of heat, the expansion of the electrically conductive material causing an increase in a radius of the medical scent.
[0040] Another aspect of the present invention is a medical scent. The medical scent includes a pattern of electrically conductive material. The pati;ern of electrically conductive material substantially allows imaging of a volume within the stmt. The electrically conductive material is shaped so as to be expandable upon application of heat, the expansion of the electrically conductive material causing an increase in a radius of the medical scent.
[0041] Another aspect of the present invention is a medical stmt. The medical scent includes a pattern of electrically conductive material. The pastern of electrically conductive material substantially prevents the medical scent from creating an imaging artifact and substantially allows imaging of a volume within the scent. The electrically conductive -G-material is shaped so as to be expandable upon application of heat, the expansion of the electrically conductive material causing an increase in a radius of the medical scent.
[0042] Another aspect of the present invention is a medical stmt. The medical scent includes a pattern of electrically conductive material and a track-and-lock mechanism having a shape substantially matching the shape of the electrically conductive material so as to substantially prevent the electrically conductive material from moving in such a way as to reduce the radius of the medical scent. The pattern of electrically conductive material substantially prevents the medical scent from creating an imaging ari;ifact.
The electrically conductive material is shaped so as to be expandable, the expansion of the electrically conductive material causing m increase in a radius of the medical scent.
[0043] Another aspect of the present invention is a medical scent. The medical scent includes a pattern of electrically conductive material and a track-and-lock mechanism having a shape substantially matching the shape of the electrically conductive material so as to substantially prevent the electrically conductive material from moving in such a way as to reduce the radius of the medical scent. The pattern of electrically conductive material substantially allows imaging of a volume within the stmt. The electrically conductive material is shaped so as to be expandable, the expansion of the electrically conductive material causing an increase in a radius of the medical scent.
[0044] Another aspect of the present invention is a medical stmt. The medical stem includes a pattern of electrically conductive material and a track-and-lock mechmism having a shape substantially matching the shape of the electrically conductive material so as to substantially prevent the electrically conductive material from moving in such a way as to reduce the radius of the medical scent. The pattern of electrically conductive material substantially prevents the medical stmt from creating an imaging artifact and substantially allows imaging of a volume within the stmt. The electrically conductive material is shaped so as to be expandable, the expansion of the electrically conductive material causing an increase in a radius of the medical scent.
[0045] Another aspect of the present invention is a medical scent. The medical stmt includes a pattern of electrically conductive material and a track-and-loch meclmnism having a shape substantially matching the shape of the electrically conductive material so as to allow the electrically conductive material to move in a single direction. The patl:ern of electrically conductive material subsi°mtially prevents the medical stmt from creating an imaging artifact.
The electrically conductive material is shaped so as to be expandable, the expansion of the electrically conductive material causing an increase in a radius of the medical scent.

[004G] Another aspect of the present invention is a medical stmt. The medical scent includes a pattern of electrically conductive material and a track-and-lock mechanism having a shape substantially matching the shape of the electrically conductive material so as to allotv the electrically conductive material to move in a single direction. The pattern of electrically conductive material substantially allows imaging of a volume within the scent.
The electrically conductive material is shaped so as to be expandable, the expansion of the electrically conductive material causing an increase in a radius of the medical scent.
[0047] Another aspect of the present invention is a medical stmt. The medical scent includes a pattern of electrically conductive material and a track-and-lock mechanism having a shape substantially matching the shape of the electrically conductive material so as to allow the electrically conductive material to move in a single direction. The pattern of electrically conductive material substantially prevents the medical scent from creating an imaging artifact and substantially allows imaging of a volume within the stmt. The electrically conductive material is shaped so as to be expandable, the expansion of the electrically conductive material causing an increase in a radius of the medical stmt.
[0048] Another aspect of the present invention is a medical scent. The medical scent includes a plurality of lima, each linlc being connected together so as to form a cylindrical shaped medical stmt, each link being shaped so as to be expandable, the expansion of the links causing an increase in a radius of the medical stmt.
[0049] Another aspect of the present invention is a medical stmt. The medical stmt includes a plurality of links, each link being connected together so as to form a cylindrical shaped medical scent, each linlc being shaped so as to be expandable upon application of heat, the expansion of the linlcs causing an increase in a radius of the medical stmt.
[0050] Another aspect oI° the present invention is a medical stmt. The medical scent includes a plurality of links, each link being connected together so as to form a cylindrical shaped medical stmt, each link being shaped so as to be expandable, the expansion of the links causing an increase in a radius of the medical scent; and a iraclc-and-lock mechanism having a shape substantially matching the shape of the links so as to substantially prevent the linlcs from moving in such a way as to reduce the radius of the medical scent.
[0051] Another aspect of the present invention is a medical scent. The medical scent includes a. plurality ol° links, each link being connected together so as to form a cylindrical shaped medical scent, each link being shaped so as to be expandable upon application of heat, the expansion of the links causing an increase in a radius of the medical scent; and a track-and-loclc mechanism having a shape substantially matching the shape of the lima so as to allow the links to move in a single direction.
_g_ [0052] Another aspect of the present invention is a method of fabricating a medical scent. The method cuts a first cylinder of electrically conductive material so as to crease a first pattern of conductive mesh strmds having a plurality of nodes; cuts a second cylinder of electrically conductive material so as to create a first pattern of conductive mesh strands having a plurality of nodes; positions tile first cylinder into a volume of the second cylinder and positioning the First cylinder with respect to the second cylinder such the nodes of the first cylinder are close to the nodes of the second cylinder without the nodes of the 1"irst cylinder touching the nodes of the second cylinder; and applies a non-conductive binding material to adjacent nodes of the two cylinders.
[0053] Another aspect of the present invention is a method of fabricating a medical stmt. The method cuts a first cylinder of electrically conductive material so as to create a i"nst pattern of conductive mesh strands having a plurality of nodes; cuts a second cylinder of electrically conductive material so as to create a first pattern of conductive mesh strands having a plurality of nodes; positions the first cylinder into a volume of the second cylinder and positioning the first cylinder with respect to the second cylinder such the nodes of the first cylinder are close to the nodes of the second cylinder without the nodes of the first cylinder touching the nodes of the second cylinder; positions a third cylinder of a non-conductive binding material between the first and second cylinders; and applies heat to the adjacent nodes of the first and second cylinders to cause the non-conductive binding material to bind the adjacent nodes together.
[0054] Another aspect of the present invention is a method of fabricating a medical stmt. The method produces a web of conductive strands wherein at all the cross-over points, a non-conductive material is applied to hold the cross-over point strands in place and to electrically isolate the conductive strands from one another; cuts a portion of the web to produce a sheet of conductive strands; forms the sheet of conductive strands into a cylinder shape; and attaches ends of sheet together to hold the cylinder shape in place.
BRIEF DESCRIPTION OF DRAWINGS
[0055] The present invention may take form in various components and arrangements of components, and in various steps and arrangements of steps. The drawings are only for purposes of illustrating a preferred embodiment and are not to be constmed as limiting the present invention, wherein:
[OOSG] Figure 1 is a schematic illustration of two conductive loops in a changing magnetic field;
[0057] Figure 2 is a schematic illustration of a conductor in a "figure-8"
configuration in a changing magnetic field;
_9_ [0058] Figure 3 is an illustration of one stmt embodiment according to the concepts of the present invention;
[0059] Figure ~ is an illustration of another stmt embodiment according to the concepts of the present invention;
[OOGO] Figure 5 is an illustration of another stmt embodiment according to the concepts of the present invention;
[OOG1] Figure 6 is an illustration of another scent embodiment according to tile concepts of the present invention;
[OOG2] Figure 7 illustrates a curved scent mesh embodiment according to the concepts of the present invention;
[OOG3] Figures 8 and ) illustrate a stmt mesh by a "~"-like shape strand according to the concepts of the present invention;
[0064] Figure 10 illustrates a scent mesh embodiment according to the concepts of the present invention;
[OOGS] Figure 11 illustrates a cross-over node in a scent mesh according to the concepts of the present invention;
(OOGG] Figure 12 illustrates another cross-over node in a scent mesh according to fihe concepts of the present invention;
[OOG7] Figure 13 illustrates another scent embodiment according to the concepts of the present invention;
[OOGB] Figure 14 illustrates a scent within a body which is heated by application of external RF energy;
[0069] Figure 15 is a cross sectional view of a coated scent according to the concepts of the present invention;
[0070] Figures 16 through 21 illustrate various steps in the creation of a medical scent according to the concepts of the present invention;
[0071] Figures 22 through 24 illustrate the use of a phnar conductive weave sheet material from which a stmt is formed according to the concepts of the present invention; and [0072] Figures 25 and 26 illustrate a locking mechanism for an expandable stem according to the concepts of the present invention.
BEST MODE FOR CARRYING OUT THE INVENTION
[0073] The present invention will be described in connection with preferred embodiments; however, it will be understood that there is no intent to limit the present invention to the embodiments described herein. On the contrary, the intent is to cover all alternatives, modifications, and equivalents as may be included within the spirit and scope of the present invention, as defined by the appended C1ai111S.
[0074] For a general understanding of the present invention, reference is made to the drawings. In the drawings, like reference have been used throughout to designate identical or equivalent elements. It is also noted that the various drawings illustrating the present invention axe not drawn to scale and that certain regions have been purposely drawn disproportionately so that the features and concepts of the present invention could be properly illustrated.
[0075] Figure 1 is a schematic illustration of induced currents 110 and 112 in two conductive rings 102 and 104, respectively, when the conductive rings 102 &
104 are placed in an environment in which there is an oscillating magnetic field 106. At an instant in time, as illustrated in Figure 1, both currents 110 ~ 112 travel in a clockwise direction. But as the magnetic field oscillates, the direction of these currents 110 & 112 will diminish to zero and then begin to circulate in a counter-clockwise direction (not shown.) [0076] Figure 2 illustrates when the conductive rings 102 & 104 have been electrically joined together to form a single "figure-8" shaped or emulating conductor 120.
The two lobes 12G & 128 of the "figure-8" shaped or emulating conductor 120 have equal planar areas. When placed in changing magnetic field 122 such that the flux of the magnetic field 122 passes through the lobes 126 & 128, no net current will be induced in the "figure-8"
shaped or emulating conductor 120. The "figure-8" shaped or emulating conductor 120 is electrically insulated at the cross-over point 124.
[0077] Figure 3 illustrates a portion of a medical stem 130, according to the concepts of the present invention. The illustrated medical scent 130 includes multiple "figure-8"
shaped or emulating conductors 132, 134, 136 & 138. The "figure-8" shaped or emulating conductors 132, 134, 13G & 138 are electrically insulated at the cross-over points 131. The cross-over points 131 may also provide mechanical support for the "figure-8"
shaped or emulating conductors 132, 134, 136 & 138 [0078] The "figure-8'' shaped or emulating conductors 132, 134, 13G & 138 are fastened together by non-conductive connectors 140. These connectors 140 may be constructed of Teflon0, TePzelO, a nonconductive polymer, silicon, or other nonconductive material. The "figure-8" shaped or emulating conductors 132, 134, 136 & 138 may be, for example, tantalum, nitinol, copper, or other conductive material or conductive composite material, which has a low magnetic susceptibility.

[0079] The "figure-8" shaped or emulating conductors realize immunity from the electromagnetic interference or insult. In other words, each "figure-8" shaped or emulating conductor has an anti-antenna geometrical shape such that the anti-antema geometrical shape prevents the medical stmt from creating an imaging artifact and/or allows the imaging of the volume within the scent.
[0080] Figure 4 illustrates a portion of a medical stmt 1G0, according to the concepts of the present invention. The illustrated medical scent 1G0 includes conductors 1G2 & 1G4 having sequential conductive loops to form the cylindrical surface of the medical scent 1G0.
The sequential conductive loops form two or more sequential "figure-8" shaped or emulating conductive loop pairs wherein each sequentially looped conductor 1G2 & 164 contains an even number of loops.
[0081] At crossover point 1G8, the conductor 1G4 is electrically isolated by an insulation member 1G5 to prevent short circuiting the overall loop sequence. At crossover point 1G9, the conductor 1G2 is electrically isolated by an insulation member 167 to prevent short circuiting the overall loop sequence. The insulation members 1G5 and 1G7, at the crossover points 1G8 & 1G9, can also provide mechanical support for conductors 162 & 1G4 so that the shape is maintained.
[0082] The sequentially looped conductors 1G2 & 1G4 are fastened to each other using non-conductive material 1GG. Material 1GG also provides means for securing the sequentially looped conductor 1G2 & 1G4 from slipping through the fasteners 1GG. Additional sequentially looped conductors (not shown) are added to complete the stmt construction.
[0083] The sequentially looped conductors realize immunity from the electromagnetic interference or insult. In other words, each sequentially looped conductor has an anti-antenna geometrical shape such that the anti-antenna geometrical shape prevents the medical scent from creating an imaging artifact and/or allows the imaging of the volume within the stem.
[0084] Figure 5 illustrates a portion of a medical scent 170, according to the concepts of the present invention. The illustrated medical stem 170 includes a single conductor 172 weaved into a loop mesh to define tl~e stmt cylinder. The weave, for elample, beginning at 174, traces down the length of the to-be-constructed scent cylinder 170 and then back up the cylinder length to define an even number of loops. The pattern formed by the weave may be sinusoidal, "Z" shaped, zig-zag shaped, or sawtooth shaped or other such pattern that traverses back and forth with respect to a direction that is perpendicular to the progressive direction of travel of the trace. This pattern forms two or more runs of two or more sequential "figure-8" shaped or emulating conductive loop pairs ~~~herein each run of two or more sequential "figure-8" shaped or emulating conductive loop pairs contains an even number of loops.
[0085] Continuing to follow the weave pattern, the conductor 172 continues to weave down and up the lengl;h of the cylinder to the point 176. To complete the scent, the weave continues in a like fashion around the circumference of the yet to-be-defined cylinder stmt 170.
[008G] At each infra-run cross-over point 178, a nonconductive material 179 is used to electrically insulate the conductor 172 From itself Additionally, the nonconductive material 179 secures the crossed-over conductor, along a run, From deforming or slipping or otherwise changing the infra-run cross-over points.
[0087] At each inter-run cross-over point 175, a nonconductive material 177 is used to electrically insulate the conductor 172 from itself Additionally, the nonconductive material 177 secures the crossed-over conductor, between runs, from deforming or slipping or otherwise changing the inter-run cross-over points.
[0088] The weave pattern of the conductor realizes immunity from the electromagnetic interference or insult. In other words, the weave pattern has an anti-antenna geometrical shape such that the anti-antenna geometrical shape prevents the medical scent from creating an imaging artifact and/or allows the imaging of the volume within the scent.
[0089] Figure 6 illustrates a portion of a cylinder shaped stmt 190 being constructed from a single conductive material 192 in a weave pattern. In this case, the conductor completes a circumferential sine-wave-like pattern rather than the longitudinal sine-wave-like pattern shown in Figure 5.
[0090] It is noted that the circumferential pattern formed by the weave may also be sawtooth or other such pattern that traverses back and forth with respect to a direction that is perpendicular to the progressive direction of travel of the trace.
[0091] At intra-run cross-over points 194 & 198, nonconductive materials 191 &

are used to electrically insulate the conductive material 192 from itself.
Additionally, the nonconductive materials 191 & 193 secure the crossed-over conductive material 192, along a run, from deforming or slipping or otherwise changing the intra-run cross-over points.
[0092] At each inter-run cross-over point 19G, a nonconductive material 195 is used to electrically insulate the conductive material 192 from itself. Additionally, the nonconductive material 195 secures the crossed-over conductive material 192, between runs, from deforming or slipping or otherwise changing the inter-run cross-over points.
[0093] The circumferential pattern realizes immunity from the electromagnetic interference or insult. In other words, the circmnferential pattern has an anti-antenna geometrical shape such that the anti-antenna geometrical shape prevents the medical stmt from creating an imaging artifact andlor allows the imaging of the volume within the stem.
[0094] Figures 7-9 illustrate how the curved segments of the sine-wave like shape of the weaves mentioned in Figures 3, 4, 5, and 6 can be replaced by "Z" shaped, zi5 zag shaped, or sawtooth shaped semnents.
[0095] Figure 7 shows a typical cross-over point of a stmt weave. Conductors 200 and 202 (or a single conductor) of a stem weave are fastened together by a non-conductive material 201 which electrically insulates the conductors 200 and 202 (or a single conductor) from each other. It is noted that conductors 200 and 202 are continuous, not discontinuous, through non-conductive material 201.
[0096] Figure 8 shows one possible alternative to the curved weave segments 200 and 202 of Figure 7. In Figure 8, the conductive segments have a "Z" shaped, zig-zag shaped, or sawtooth shaped. The conductive segments 204 and 206 do not cross over each other. The conductive segments 204 and 206 are fastened to each other by material 208 which electrically isolates conductive segments 204 and 206 from each other.
[0097] When the stmt is to be positioned and expanded in the body, the "Z"
shaped segments of conductive segments 204 and ZOG straighten out to increase the overall diameter of the cylinder defined by the stmt. This is shown in Figure 9 wherein the conductive segments 204 and 206 have been straightened, thus increasing their span length and the overall diameter of the cylinder defined by the scent.
[0098] Figure 10 shows a conductive cylinder medical scent 220 mesh comprising many conductive strands 221 and junctions 222. In this case, the conductors complete a sine-wave-life pattern. The pattern formed by the conductors may be circulnferential or longitudinal. It is noted that the pattern formed by the conductors may also be "Z" shaped, zig-zag shaped, or sawtooth shaped or other such pattern that traverses back and forth with respect to a direction that is perpendicular to the progressive direction of travel of the trace.
[0099] The pattern formed by the conductors realizes immunity fTOIn the electromagnetic interference or insult. In other words, the pattern formed by the conductors has an anti-antema geometrical shape such that the anti-antenna geometrical shape prevents the medical scent from creating an imaging artifact andlor allows the imaging of the volume within the stmt.
[0100] Figure 11 illustrates an expanded view of a junction 222, according to the concepts of the present invention. The junction 222 includes four conductive strands 224, 226, 228 & 230 fastened together and electrically isolated from one another by the non-conductive material 234. Small holes 225, 227, 229 & 231 are optionally fabricated into the ends of the conductive strands 224, 22G, 228 & 230 so that the fastening material 234 may be shaped to include protrusions to securely fasten to the strands 224, 22G, 228 & 230 with no possibility of any of the strands slipping out of the material 234.
[0101] It is noted that, although not shown, certain ends of the conductive strands 224, 22G, 228 & 230 may be electrically connected to each other to form the proper loop circuitry needed to produce the opposing currents in the stmt so that a net zero current is realized. For example, conductive strand 224 may be electrically connected to conductive strand 230, while conductive strand 22G may be electrically connected to conductive strand 228.
On the other hand, for another example, conductive strand 224 may be electrically connected to conductive strand 226, while conductive strand 230 may be electrically connected to conductive strand 228.
[0102] The connection pattern of certain ends of the conductive strands realizes immunity from the electromagnetic interference or insult. In other words, the connection pattern of ceri:ain ends of the conductive strands has an anti-antenna geometrical shape such that the anti-antenna geometrical shape prevents the medical stmt from creating an imaging artifact and/or allows the imaging of the volume within the stmt.
[0103] Other shapes for the conductive strand ends to help secure the conductive strands 224, 22G, 228 &~ 230 together, while keeping the conductive strands 224, 226, 228 &
230 electrically isolated, may be used. For example, Figure 12 shows the conductive strands 224, 22G, 228 & 230 with barbed ends 240, 242, 24G & 248, respectively, so that the fastening material 234 may be shaped around the barbed ends 240, 242, 24G &
248 to securely fasten to the strands 224, 22G, 228 & 230 with no possibility of any of the strands slipping out of the material 234.
[0104] It is noted that, although not shown, certain of the barbed ends 240, 242, 24G &
248 of the conductive strands 224, 226, 228 & 230 may be electrically connected to each other to form the proper loop circuitry needed to produce the opposing currents in the scent so that a net zero current is realized. For example, conductive barbed end 240 may be electrically connected to conductive barbed end 242, while conductive barbed end 24G may be electrically connected to conductive barbed end 248. On the other hand, for another example, conductive barbed end 240 may be electrically connected to conductive barbed end 24G, while conductive barbed end 248 may be electrically connected to conductive barbed end 242.
[0x05] The connection pattern of certain barbed ends of the conductive strands realizes immunity from the electromagnetic interference or insult. In other words, the connection pattern of certain barbed ends of the conductive strands has an anti-antenna geometrical shape such that the anti-antenna geometrical shape prevents the medical stmt from creating an imaging artifact and/or allows the imaging o f the volume within the stmt.
[0106] Figure 13 illustrates another type of conductive stmt weave wl>ich can be employed as a stmt or as a component of a scent. The conductor 260 is formed to produce a loop 261 that would have induced current flowing in a first direction, a loop 264 that would have induced current flowing in a second direction, a loop 2GG that would have induced current flowing in the first direction, and a loop 268 that would have induced current Flowing in the second direction, the first direction being opposite of the second direction. The direction changing pattern 263 enables the adjacent loops to have induced currents flowing in opposite directions.
[0107] An example of such a configuration is a loop-1l2 hitch-loop-ll2 hitch pattern wherein the lI2 hitch would correspond to the direction changing pattern 263 of Figure 13.
[0108] As illustrated in Figure 13, stacking such loops 261, 264, 266, 268 ..
, with the interspersed direction changing pattern 263, forms a cylindrical coil. In this way, when following the conductor 260 from one end to the other, a trace would travel clockwise around the First loop 261, counter-clockwise around the next loop 264, clockwise around the next 2GG, counter-clockrwise around the next 2G8, and so on.
[0109] At each cross-over point, nonconductive materials 267 & 265 are used to electrically insulate the conductive material 260 from itself. Additionally, the nonconductive materials 267 & 265 secure the crossed-over conductive material 260 from deforming or slippuzg or otherwise changing the cross-over points.
[0110] ~ptionally, non-conductive structural ribbing 262 may also be added to increase the structure st1-ength and integrity of the overall scent.
[0111] The stacked loop pattern, with interspersed direction changing pattern, realizes impunity from the electromagnetic interference or insult. In oilier words, the stacked loop pattern, with interspersed direction changing pattern, has an anti-antenna geometrical shape such that the anti-antenna geometrical shape prevents the medical scent from creating an imaging artifact and/or allows the imaging of the volume vvitlun the scent.
[0112] Figure 14 illustrates the deployment of an arterial scent 302. The arterial scent 302 is initially attached to a guidewire 306 at its distal end 304 and is positioned into place within a body 310 and within an artery 308. The arterial stmt 302 is fabricated out of a memory material, for example, nitinol which, when heated, returns to a previous manufactured shape.
[0113] Initially the arterial stent 302 has a small cylindrical diameter. When RF energy 312 is transmitted through the body 310, the arterial scent 302 will heat up and expand to its final deployed diameter.
[0114] In one embodiment, the distal end 304 of the guidewire 306 is coated with a material which is particularly efficient at converting the RF energy 312 into heat energy to heat and activate the stmt 302 expansion.
[0115] In another embodiment, the arterial scent 302, which may be a mesh or weave like stmt as describe above, is coated with a material 322 (see Figure 15) which is particularly efficient at converting the RF energy 312 (see Figure 15) into heat energy. It is noted that the arterial stem 302 should be constructed to realize immuniy from the electromagnetic interference or insult. In other words, the arterial stmt 302 should be constructed to have an anti-antenna geometrical shape such that the anti-antenna geometrical shape prevents the medical stmt from creating an imaging artifact and/or allows the imaging of the volume within the stmt.
[0116] Figure 15 shows a. cross-section of the arterial stmt 302 which is comprised of the stmt mesh shape memory material 320 coated with heating material 322.
Alternatively, only the outside of the stmt mesh 320 is coated with the heating material 322.
Alternatively, only the inside of the stmt mesh 320 is coated with the heating material 322.
[0117] The RF energy 312 may be that which is transmitted by an MRI system (not shown) or may be that from some other RF transmitter (not shown). It is known that in some cases and under some conditions long conductors in an MRI environment can heat up. When this phenomenon is incorporated into the catheter or guide-wire which is part of the overall stmt delivery system, this heat energy can be utilized to activate the shape memory material expansion, thus expanding the stmt.
[0118] Figure 16-21 illustrate one possible fabrication process for a medical stmt.
Referring to Figure 16, the initial stock material 349; for example, tantalum;
is in the shape of a hollow cylinder. The cylinder may be cut into a pattern as illustrated in Figure 17, for example. The cutting of the cylinder stock material 349 may be accomplished by laser cutting or by other means.
[0119] Figure 17 shows the resulting cut cylinder 351 which comprises end rings 350 and 354, and one half of the scent pattern mesh strands 356, 358 & 360. (Other mesh strands are shown as dashed lines for clarity.) [0120] The mesh strands 35G, 358 & 360 are connected to the end rings 350 &
354 by tabs 362 & 364.
[0121] Figure 18 shows two such cut cylinders 351 positioned such that one cylinder has been rotated by 180 degrees; so that the two end rings 354 are close to each other. As the arrows 355 in Figure 18 illustrate, one cylinder is to be slid into the other.
This may be accomplished in several different ways including: heating one of the cut cylinders so that it expands and/or fabricating one of the two cut cylinders out a cylinder sioclc material which is slightly smaller in diameter than the other.
[0122] Figure 19 illustrates the two cut cylinders in their anal position. The orientation is such that the nodes in the cut pattern 381 & 382 are close together, but are not touching.
[0123] The two cut cylinders realize immunity from the electromagnetic interference or insult. In other words, the two cut cylinders have an anti-antenna geometrical shape such that the anti-antenna. geometrical shape prevents the medical stmt from creating an imaging artifact and/or allows the imaging of the volume «rithin the stmt.
[0124] Figure 20 illustrates the application of a non-conductive binding material 390, for example, silicon rubber or other thermoplastic or thermoset polymer, or glass, etc. at each of the nodes 381 & 382 which rigidly fasten the conductive mesh strands 35G, 358 & 3G0 together. The resulting stmt mesh 388 is then cut from the supporting nubs 3G2 & 3G4 of Figure 17, giving the final stmt portion 388 shown in Figure 21.
[0125] The pattern that is cut out of the initial hollow cylinder stock of Figure 16 may alternatively include "2" shaped, zig-zag shaped, or sawtooth shaped segments as shown in Figure 8 which facilitates the final stmt's ability to expand radially.
[012G] In one embodiment (not shown, but referring to Figure 21), the non-conductive binding material 390 of Figure 20 is initially in the form of a hollow cylinder which is so dimensioned as to fit between the two cut cylinders 351 forming three concentric cylinders, the binding material 390 cylinder being the middle layer. The application of a laser or other means then melts the binding material 390 at the nodes as well as eliminates unwanted binding material.
[0127] In one embodiment, the weaving of the conductive material (see, for example, Figure 5) is used to produce a sheet stock planar material 400 illustrated in Figure 22. As mentioned for other conductive weaves (see description of Figure 5), at all the cross-over points, non-conductive materials 401 and 403 is applied to hold the cross-over point strands in place and to electrically isolate the conductive strands from one another.
A portion 40G of the planar woven sheet or web is cut from the initial woven sheet 400. The dashed lines 402 and 404 indicate where a cut through the woven sheet or web 400 is made.
[0128] Figures 23 and 24 show the cut portion 40G being rolled into a cylinder shape.
The cut strand, which come together as the cut edges 402 and 404, are brought together and then attached to one another to hold the scent together. The attachment may be affected by either a conductive material (solder, welding, etc.) or by a non-conductive means (glass, polymer, etc.) [0129] In one embodiment (not shown) conductive metallic scents are coated with a nano-magnetic thin film coating which reduces the amount of eddy currents generated by the oscillating magnetic fields of an MRI system. In one such embodiment, multiple lays oP
various compositions and/or thiclazesses are applied to the stems. In another embodiment, only portions of the stem are coated with the nano-magnetic thin films, thus changing the MRI system induced eddy current flow pattern.
[0130] In one embodiment, non-magnetic stems are coating with a nano-magnetic thin film coating which alters the magnetic fields of the MRI system enough for the stmt to be rrisible in an MR image without distorting the image of the tissue a short distance from the scent.
[0131] In another embodiment (not sho«ln) conductive metallic scent is coated with a carbon composite material, in part, in patterns, or in whole.
[0132] In another embodiment (not shown) non-conductive sients are coated with a carbon composite material, in part, in patterns, or in whole.
[0133] Figures 25 and 26 illustrate a stmt 500 which is, initially, at its smallest radius "r" 501. The stmt 500 is in the shape of a cylinder.
[0134] Figure 25 illustrates a cross section of the stmt 500. A stmt strand 512 is wrapped within the scent 500 to reduce the cylindrical radius 501 before deplo5nnent with a body. The stmt 500 has a track-and-lock mechanism 502 through which stmt strand 512 passes and is conl"med to.
[0135] Figure 26 gives one example of a track-and-lock mechanism 502. A
portion 506 of the track-and-lock mechanism 502 is shown as a cut-away view in Figure 26. The scent strand 512 has teeth which match that of the teeth 510 within the track-and-loch mechanism 502. The scent strand 512 is conned to move in the guide slot 514 and can only move in such a way so as to increase the overall radius 501 of the cylinder scent 500.
[0136] The shape of the teeth of the scent strand 512 and the shape of the teeth of the track-and-loci: mechanism 502 prevent the scent strand 512 from moving in such a way as to reduce the cylinder radius 501. Thus, when deployed with; e.g. a balloon catheter system (not shown); the stmt may be expanded to its full and final radius and locked into that radius.
[0137] In summary, the various scent embodiments, described above, realize immunity from the electromagnetic interference or insult. In other words, the stmt has an anti-antenna geometrical shape such that the anti-antenna geometrical shape prevents the medical stem from creating an imaging artifact and/or allows the imaging ofthe volume within the scent.
[0138] Although the various embodiments discussed above have been described in the context of a medical scent, the vaxious concepts and aspects of the present invention are readily applicable to other devices and uses.
[0139] For example, the pattern of electrically conductive material, according to the various concepts of the present invention, cm be used in medical devices having electrically conductive structures that would, under normal circumstances, generate imaging artifacts and/or heat in response to the imaging processes, such as magnetic radiation imaging (MRI), and/or radio frequency radiation so as to mane the medical devices imaging artifact immune and heat resistant. More specifically, the pattern of electrically conductive material, according to the various concepts of the present invention, could be used to create an imaging artifact immune and heat resistant mail for a doctor's glove or clothing.
[0140] While various examples and embodiments of the present invention have been shown and described, it will be appreciated by those spilled in the art that the spirit and scope of the present invention are not limited to the specific description and drawings herein, but extend to various modifications and changes.

Claims

THE CLAIMS

1. A medical stent, comprising:
a pattern of electrically conductive material;
said pattern of electrically conductive material having an anti-antenna geometrical shape such that said anti-antenna geometrical shape substantially prevents the medical stent from creating an imaging artifact.
2. The medical stent as claimed in claim 1, wherein said pattern is formed by multiple "figure-8" shaped electrical conductors.
3. The medical stent as claimed in claim 1, wherein said pattern is formed by multiple "figure-8" emulating electrical conductors.
4. The medical stent as claimed in claim 1, wherein said pattern is formed by multiple sine-wave-like shaped electrical conductors.
5. The medical stent as claimed in claim 1, wherein said pattern is formed by multiple zig-zag patterned electrical conductors.
6. The medical stent as claimed in claim 1, wherein said pattern is formed by multiple electrical conductors, each having sequential conductive loops.
7. The medical stent as claimed in claim 1, wherein said pattern is formed by a single conductor weaved into a loop mesh, said loop mesh being formed of two or more sequential "figure-8" shaped conductive loop pairs.
8. The medical stent as claimed in claim 7, wherein said single conductor is sine-wave-like shaped.
9. The medical stent as claimed in claim 7, wherein said single conductor is zig-zag patterned.
10. A medical stent, comprising:
a pattern of electrically conductive material;
said pattern of electrically conductive material having an anti-antenna geometrical shape such that said anti-antenna geometrical shape substantially allows imaging of a volume within the stent.
11. The medical stent as claimed in claim 10, wherein said pattern is formed by multiple "Figure-8" shaped electrical conductors.
12. The medical stent as claimed in claim 10, wherein said pattern is formed by multiple "Figure-8" emulating electrical conductors.
13. The medical stent as claimed in claim 10, wherein said pattern is formed by multiple sine-wave-like shaped electrical conductors.

14. The medical stent as claimed in claim 10, wherein said pattern is formed by multiple zig-zag patterned electrical conductors.
15. The medical stent as claimed in claim 10, wherein said pattern is formed by multiple electrical conductors, each having sequential conductive loops.
16. The medical stent as claimed in claim 10, wherein said pattern is formed by a single conductor weaved into a loop mesh, said loop mesh being formed of two or more sequential "figure-8" shaped conductive loop pairs.
17. The medical stent as claimed in claim 16, wherein said single conductor is sine-wave-like shaped.
18. The medical stent as claimed in claim 16, wherein said single conductor is zig-zag patterned.
19. A medical stent, comprising:
a pattern of electrically conductive material;
said pattern of electrically conductive material having an anti-antenna geometrical shape such that said anti-antenna geometrical shape substantially prevents the medical stent from creating an imaging artifact and substantially allows imaging of a volume within the stent.
20. The medical stent as claimed in claim 19, wherein said pattern is formed by multiple "figure-8" shaped electrical conductors.
21. The medical stent as claimed in claim 19, wherein said pattern is formed by multiple "figure-8" emulating electrical conductors.
22. The medical stent as claimed in claim 19, wherein said pattern is formed by multiple sine-wave-like shaped electrical conductors.
23. The medical stent as claimed in claim 19, wherein said pattern is formed by multiple zig-zag patterned electrical conductors.
24. The medical stent as claimed in claim 19, wherein said pattern is formed by multiple electrical conductors, each having sequential conductive loops.
25. The medical stent as claimed in claim 19, wherein said pattern is formed by a single conductor weaved into a loop mesh, said loop mesh being formed of two or more sequential "figure-8" shaped conductive loop pairs.
26. The medical stent as claimed in claim 25, wherein said single conductor is sine-wave-like shaped.
27. The medical stent as claimed in claim 25, wherein said single conductor is zig-zag patterned.

28. The medical stent as claimed in claim 1, wherein said pattern is formed by multiple "Z"-shaped electrical conductors.
29. The medical stent as claimed in claim 1, wherein said pattern is formed by multiple sawtooth shaped electrical conductors.
30. The medical stent as claimed in claim 7, wherein said single conductor is "Z"-shaped.
31. The medical stent as claimed in claim 7, wherein said single conductor is sawtooth shaped.
32. The medical stent as claimed in claim 10, wherein said pattern is formed by multiple "Z"-shaped electrical conductors.
33. The medical stent as claimed in claim 10, wherein said pattern is formed by multiple sawtooth shaped electrical conductors.
34. The medical stent as claimed in claim 16, wherein said single conductor is "Z"-shaped.
35. The medical stent as claimed in claim 16, wherein said single conductor is sawtooth shaped.
36. The medical stent as claimed in claim 19, wherein said pattern is formed by multiple "Z"-shaped electrical conductors.
37. The medical stent as claimed in claim 19, wherein said pattern is formed by multiple sawtooth shaped electrical conductors.
38. The medical stent as claimed in claim 25, wherein said single conductor is "Z"-shaped.
39. The medical stent as claimed in claim 25, wherein said single conductor is sawtooth shaped.
40. The medical stent as claimed in claim 1, wherein said electrically conductive material is tantalum.
41. The medical stent as claimed in claim 1, wherein said electrically conductive material is nitinol.
42. The medical stent as claimed in claim 1, wherein said electrically conductive material is stainless steel.
43. The medical stent as claimed in claim 1, wherein said electrically conductive material is NbZr.
44. The medical stent as claimed in claim 1, wherein said electrically conductive material is titanium.

45. The medical stent as claimed in claim 10, wherein said electrically conductive material is tantalum.
4G. The medical stent as claimed in claim 10, wherein said electrically conductive material is nitinol.
47. The medical stent as claimed in claim 10, wherein said electrically conductive material is stainless steel.
48. The medical stent as claimed in claim 10, wherein said electrically conductive material is NbZr.
49. The medical stent as claimed in claim 10, wherein said electrically conductive material is titanium.
50. The medical stent as claimed in claim 19, wherein said electrically conductive material is tantalum.
51. The medical stent as claimed in claim 19, wherein said electrically conductive material is nitinol.
52. The medical stent as claimed in claim 19, wherein said electrically conductive material is stainless steel.
53. The medical stent as claimed in claim 19, wherein said electrically conductive material is NbZr.
54. The medical stent as claimed in claim 19, wherein said electrically conductive material is titanium.
55. The medical stent as claimed in claim 1, further comprising:
non-conductive binding material located at areas where said electrically conductive material produces a cross-over point so as to prevent a short circuit between crossing-over electrically conductive materials.
56. The medical stent as claimed in claim 55, wherein said non-conductive binding material providing structural support to said pattern of electrically conductive material.
57. The medical stent as claimed in claim 55, wherein said non-conductive binding material is silicon rubber.
58. The medical stent as claimed in claim 55, wherein said non-conductive binding material is a thermoplastic.
59. The medical stent as claimed in claim 55, wherein said non-conductive binding material is a thermoset polymer.
60. The medical stem as claimed in claim 55, wherein said non-conductive binding material is glass.

61. The medical stent as claimed in claim 10, further comprising:
non-conductive binding material located at areas where said electrically conductive material produces a cross-over point so as to prevent a short circuit between crossing over electrically conductive materials.
62. The medical stent as claimed in claim 61, wherein said non-conductive binding material providing structural support to said pattern of electrically conductive material.
63. The medical stent as claimed in claim 61, wherein said non-conductive binding material is silicon rubber.
64. The medical stent as claimed in claim 61, wherein said non-conductive binding material is a thermoplastic.
65. The medical stent as claimed in claim 61, wherein said non-conductive binding material is a thermoset polymer.
66. The medical stent as claimed in claim 61, wherein said non-conductive binding material is glass.
67. The medical stent as claimed in claim 19, further comprising:
non-conductive binding material located at areas where said electrically conductive material produces a cross-over point so as to prevent a short circuit between crossing-over electrically conductive materials.
68. The medical stent as claimed in claim 67, wherein said non-conductive binding material providing structural support to said pattern of electrically conductive material.
69. The medical stent as claimed in claim 67, wherein said non-conductive binding material is silicon rubber.
70. The medical stent as claimed in claim 67, wherein said non-conductive binding material is a thermoplastic.
71. The medical stent as claimed in claim 67, wherein said non-conductive binding material is a thermoset polymer.
72. The medical stent as claimed in claim 67, wherein said non-conductive binding material is glass.
73. The medical stent as claimed in claim 7, wherein said single conductor is shaped to form a first-loop/direction-changing-pattern/second-loop pattern such that current induced in the first loop of said loop/direction-changing-pattern/loop pattern flows has substantially a same magnitude but opposite direction as current induced in the second loop.

74. The medical stent as claimed in claim 73, wherein said first-loop/direction-changing-pattern/second-loop pattern is a first-loop/half-hitch/second-loop pattern such that the direction changing pattern is a half hitch pattern.
75. The medical stent as claimed in claim 73, wherein said first-loop/direction-changing-pattern/second-loop pattern is repeated along a length of the medical stent.
76. The medical stent as claimed in claim 16, wherein said single conductor is shaped to form a first-loop/direction-changing-pattern/second-loop pattern such that current induced in the first loop of said loop/direction-changing-pattern/loop pattern flows has substantially a same magnitude but opposite direction as current induced in the second loop.
77. The medical stent as claimed in claim 76, wherein said first-loop/direction-changing-pattern/second-loop pattern is a first-loop/hall hitch/second-loop pattern such that the direction changing pattern is a half hitch pattern.
78. The medical stent as claimed in claim 76, wherein said first-loop/direction-changing-pattern/second-loop pattern is repeated along a length of the medical stent.
79. The medical stent as claimed in claim 25, wherein said single conductor is shaped to form a first-loop/direction-changing-pattern/second-loop pattern such that current induced in the first loop of said loop/direction-changing-pattern/loop pattern flows has substantially a same magnitude but opposite direction as current induced in the second loop.
80. The medical stent as claimed in claim 79, wherein said first-loop/direction-changing-pattern/second-loop pattern is a first-loop/half-hitch/second-loop pattern such that the direction changing pattern is a half hitch pattern.
81. The medical stent as claimed in claim 79, wherein said first-loop/direction-changing-pattern/second-loop pattern is repeated along a length of the medical stent.
82. An electrically conductive structure, comprising:
a pattern of electrically conductive material;
said pattern of electrically conductive material having an anti-antenna geometrical shape such that said anti-antenna geometrical shape substantially prevents creation of an imaging artifact by the electrically conductive structure.
83. The electrically conductive structure as claimed in claim 82, wherein said pattern is formed by multiple "Figure-8" shaped electrical conductors.
84. The electrically conductive structure as claimed in claim 82, wherein said pattern is formed by multiple sine-wave-like shaped electrical conductors.
85. The electrically conductive structure as claimed in claim 82, wherein said pattern is formed by multiple zig-zag patterned electrical conductors.

86. The electrically conductive structure as claimed in claim 82, wherein said pattern is formed by multiple electrical conductors, each having sequential conductive loops.
87. The electrically conductive structure as claimed in claim 82, wherein said pattern is formed by a single conductor weaved into a loop mesh, said loop mesh being formed of two or more sequential "figure-8" shaped conductive loop pairs.
88. The electrically conductive structure as claimed in claim 87, wherein said single conductor is sine-wave-like shaped.
89. The electrically conductive structure as claimed in claim 87, wherein said single conductor is zig-zag patterned.
90. A medical device, comprising:
a pattern of electrically conductive material;
said pattern of electrically conductive material having an anti-antenna geometrical shape such that said anti-antenna geometrical shape substantially prevents creation of an imaging artifact by the medical device.
91. The medical device as claimed in claim 90, wherein said pattern is formed by multiple "figure-8" shaped electrical conductors.
92. The medical device as claimed in claim 90, wherein said pattern is formed by multiple sine-wave-like shaped electrical conductors.
93. The medical device as claimed in claim 90, wherein said pattern is formed by multiple zig-zag patterned electrical conductors.
94. The medical device as claimed in claim 90, wherein said pattern is formed by multiple electrical conductors, each having sequential conductive loops.
95. The medical device as claimed in claim 90, wherein said pattern is formed by a single conductor weaved into a loop mesh, said loop mesh being formed of two or more sequential "figure-8" shaped conductive loop pairs.
96. The medical device as claimed in claim 95, wherein said single conductor is sine-wave-like shaped.
97. The medical device as claimed in claim 95, wherein said single conductor is zig-zag patterned.
98. An electrically conductive structure, comprising:
a pattern of electrically conductive material;
said pattern of electrically conductive material having an anti-antenna geometrical shape such that said anti-antenna geometrical shape substantially allows imaging of a volume within the electrically conductive structure.

99. The electrically conductive structure as claimed in claim 98, wherein said pattern is formed by multiple "figure-8" shaped electrical conductors.
100. The electrically conductive structure as claimed in claim 98, wherein said pattern is formed by multiple sine-wave-like shaped electrical conductors.
101. The electrically conductive structure as claimed in claim 98, wherein said pattern is formed by multiple zig-zag patterned electrical conductors.
102. The electrically conductive structure as claimed in claim 98, wherein said pattern is formed by multiple electrical conductors, each having sequential conductive loops.
103. The electrically conductive structure as claimed in claim 98, wherein said pattern is formed by a single conductor weaved into a loop mesh, said loop mesh being formed of two or more sequential "figure-8" shaped conductive loop pairs.
104. The electrically conductive structure as claimed in claim 103, wherein said single conductor is sine-wave-like shaped.
105. The electrically conductive structure as claimed in claim 103, wherein said single conductor is zig-zag patterned.
106. An electrically conductive structure, comprising:
a pattern of electrically conductive material;
said pattern of electrically conductive material having an anti-antenna geometrical shape such that said anti-antenna geometrical shape substantially prevents creation of an imaging artifact by the medical device and substantially allows imaging of a volume within the electrically conductive structure.
107. The electrically conductive structure as claimed in claim 106, wherein said pattern is formed by multiple "figure-8" shaped electrical conductors.
108. The electrically conductive structure as claimed in claim 106, wherein said pattern is formed by multiple sine-wave-like shaped electrical conductors.
109. The electrically conductive structure as claimed in claim 106, wherein said pattern is formed by multiple zig-zag patterned electrical conductors.
110. The electrically conductive structure as claimed in claim 106, wherein said pattern is formed by multiple electrical conductors, each having sequential conductive loops.
111. The electrically conductive structure as claimed in claim 106, wherein said pattern is formed by a single conductor weaved into a loop mesh, said loop mesh being formed of two or more sequential "figure-8" shaped conductive loop pairs.
112. The electrically conductive structure as claimed in claim 111, wherein said single conductor is sine-wave-like shaped.

113. The electrically conductive structure as claimed in claim 111, wherein said single conductor is zig-zag patterned.
114. A medical device, comprising:
a pattern of electrically conductive material;
said pattern of electrically conductive material having an anti-antenna geometrical shape such that said anti-antenna geometrical shape substantially allows imaging of a volume within the medical device.
115. The medical device as claimed in claim 114, wherein said pattern is formed by multiple "figure-8" shaped electrical conductors.
116. The medical device as claimed in claim 114, wherein said pattern is formed by multiple sine-wave-like shaped electrical conductors.
117. The medical device as claimed its claim 114, wherein said pattern is formed by multiple zig-zag patterned electrical conductors.
118. The medical device as claimed in claim 114, wherein said pattern is formed by multiple electrical conductors, each having sequential conductive loops.
119. The medical device as claimed in claim 114, wherein said pattern is formed by a single conductor weaved into a loop mesh, said loop mesh being formed of two or more sequential "figure-8" shaped conductive loop pairs.
120. The medical device as claimed in claim 119, wherein said single conductor is sine-wave-like shaped.
121. The medical device as claimed in claim 119, wherein said single conductor is zig-zag patterned.
122. A medical device, comprising:
a pattern of electrically conductive material;
said pattern of electrically conductive material having an anti-antenna geometrical shape such that said anti-antenna geometrical shape substantially prevents creation of an imaging artifact by the medical device and substantially allows imaging of a volume within the medical device.
123. The medical device as claimed in claim 122, wherein said pattern is formed by multiple "figure-8" shaped electrical conductors.
124. The medical device as claimed in claim 122, wherein said pattern is formed by multiple sine-wave-like shaped electrical conductors.
125. The medical device as claimed in claim 122, wherein said pattern is formed by multiple zig-zag patterned electrical conductors.

126. The medical device as claimed in claim 122, wherein said pattern is formed by multiple electrical conductors, each having sequential conductive loops.
127. The medical device as claimed in claim 122, wherein said pattern is formed by a single conductor weaved into a loop mesh, said loop mesh being formed of two or more sequential "figure-8" shaped conductive loop pairs.
128. The medical device as claimed in claim 127, wherein said single conductor is sine-wave-like shaped.
129. The medical device as claimed in claim 127, wherein said single conductor is zig-zag patterned.
130. A medical stent, comprising:
a pattern of electrically conductive material;
said pattern of electrically conductive material substantially preventing the medical stent from creating an imaging artifact.
131. A medical stent, comprising:
a pattern of electrically conductive material;
said pattern of electrically conductive material substantially allowing imaging of a volume within the stent.
132. A medical stent, comprising:
a pattern of electrically conductive material;
said pattern of electrically conductive material substantially preventing the medical stent from creating an imaging artifact and substantially allowing imaging of a volume within the stent.
133. An electrically conductive structure, comprising:
a pattern of electrically conductive material;
said pattern of electrically conductive material substantially prevents creation of an imaging artifact by the electrically conductive structure.
134. A medical device, comprising:
a pattern of electrically conductive material;
said pattern of electrically conductive material substantially prevents creation of an imaging artifact by the medical device.
135. An electrically conductive structure, comprising:
a pattern of electrically conductive material;
said pattern of electrically conductive material substantially allows imaging of a volume within the electrically conductive structure.
136. An electrically conductive structure, comprising:

a pattern of electrically conductive material;
said pattern of electrically conductive material substantially prevents creation of an imaging artifact by the medical device and substantially allows imaging of a volume within the electrically conductive structure.
137. A medical device, comprising:
a pattern of electrically conductive material;
said pattern of electrically conductive material substantially allows imaging of a volume within the medical device.
138. A medical device, comprising:
a pattern of electrically conductive material;
said pattern of electrically conductive material having an anti-antenna geometrical shape such that said anti-antenna geometrical shape substantially prevents creation of an imaging artifact by the medical device and substantially allows imaging of a volume within the medical device.
139. A medical stent, comprising:
a pattern of electrically conductive material;
said pattern of electrically conductive material substantially preventing the medical stent from creating an imaging artifact;
said electrically conductive material being shaped so as to be expandable, said expansion of said electrically conductive material causing an increase in a radius of the medical stent.
140. A medical stent, comprising:
a pattern of electrically conductive material;
said pattern of electrically conductive material substantially allowing imaging of a volume within the stent;
said electrically conductive material being shaped so as to be expandable, said expansion of said electrically conductive material causing an increase in a radius of the medical stent.
141. A medical stent, comprising:
a pattern of electrically conductive material;
said pattern of electrically conductive material substantially preventing the medical stent from creating an imaging artifact and substantially allowing imaging of a volume within the stent;

said electrically conductive material being shaped so as to be expandable, said expansion of said electrically conductive material causing an increase in a radius of the medical stent.
142. A medical stent, comprising:
a pattern of electrically conductive material;
said pattern of electrically conductive material substantially preventing the medical stent from creating an imaging artifact;
said electrically conductive material being constructed so as to be expandable upon application of heat, said expansion of said electrically conductive material causing an increase in a radius of the medical stent.
143. A medical stent, comprising:
a pattern of electrically conductive material;
said pattern of electrically conductive material substantially allowing imaging of a volume within the stent;
said electrically conductive material being constructed so as to be expandable upon application of heat, said expansion of said electrically conductive material causing an increase in a radius of the medical stent.
144. A medical stent, comprising:
a pattern of electrically conductive material;
said pastern of electrically conductive material substantially preventing the medical stent from creating an imaging artifact and substantially allowing imaging of a volume within the stent;
said electrically conductive material being constructed so as to be expandable upon application of heat, said expansion of said electrically conductive material causing an increase in a radius of the medical stent.
145. A medical stent, comprising:
a pattern of electrically conductive material; and said pastern of electrically conductive material substantially preventing the medical stent from creating an imaging artifact;
said electrically conductive material being shaped so as to be expandable, said expansion of said electrically conductive material causing an increase in a radius of the medical stent;
a track-and-lock mechanism having a shape substantially matching the shape of said electrically conductive material so as to substantially prevent said electrically conductive material from moving in such a way as to reduce the radius of the medical stent.

146. A medical stent, comprising:
a pattern of electrically conductive material; and said pattern of electrically conductive material substantially allowing imaging of a volume within the stent;
said electrically conductive material being shaped so as to be expandable, said expansion of said electrically conductive material causing an increase in a radius of the medical stent;
a track-and-lock mechanism having a shape substantially matching the shape or said electrically conductive material so as to substantially prevent said electrically conductive material from moving in such a way as to reduce the radius of the medical stent.
147. A medical stent, comprising:
a pattern of electrically conductive material; and said pattern of electrically conductive material substantially preventing the medical stent from creating an imaging artifact and substantially allowing imaging of a volume within the stent;
said electrically conductive material being shaped so as to be expandable, said expansion of said electrically conductive material causing an increase in a radius of the medical stent;
a track-and-lock mechanism having a shape substantially matching the shape of said electrically conductive material so as to substantially prevent said electrically conductive material from moving in such a way as to reduce the radius of the medical stent.
148. A medical stent, comprising:
a pattern of electrically conductive material; and said pattern of electrically conductive material substantially preventing the medical stent from creating an imaging artifact;
said electrically conductive material being shaped so as to be expandable, said expansion of said electrically conductive material causing an increase in a radius of the medical stent;
a track-and-lock mechanism having a shape substantially matching the shape of said electrically conductive material so as to allow said electrically conductive material to move in a single direction.
149. A medical stent, comprising:
a pattern of electrically conductive material; and said pattern of electrically conductive material substantially allowing imaging of a volume within the stent;
-33-~

said electrically conductive material being shape so as to be expandable, said expansion of said electrically conductive material causing an increase in a radius of the medical stent;
a track-and-lock mechanism having a shaped substantially matching the shape of said electrically conductive material so as to allow said electrically conductive material to move in a single direction.
150. A medical stent, comprising:
a pattern of electrically conductive material; and said pattern of electrically conductive material substantially preventing the medical stent from creating an imaging artifact and substantially allowing imaging of a volume within the stent;
said electrically conductive material being shape so as to be expandable, said expansion of said electrically conductive material causing an increase in a radius of the medical stent;
a track-and-lock mechanism having a shaped substantially matching the shape of said electrically conductive material so as to allow said electrically conductive material to move in a single direction.
151. A medical stent, comprising:
a plurality of links, each link being connected together so as to form a cylindrical shaped medical stent, each link being shaped so as to be expandable, said expansion of said links causing an increase in a radius of the medical stent.
152. A medical stent, comprising:
a plurality of links, each link being connected together so as to form a cylindrical shaped medical stent, each link being shaped so as to be expandable upon application of heat, said expansion of said links causing an increase in a radius of the medical stent.
153. A medical stent, comprising:
a plurality of links, each link being connected together so as to form a cylindrical shaped medical stent, each link being shaped so as to be expandable, said expansion of said links causing an increase in a radius of the medical stent; and a track-and-lock mechanism having a shape substantially matching the shape of said links so as to substantially prevent said links from moving in such a way as to reduce the radius of the medical stent.
154. A medical stent, comprising:

a plurality of links, each link being connected together so as to form a cylindrical shaped medical stent, each link being shaped so as to be expandable upon application of heat, said expansion of said links causing an increase in a radius of the medical stent; and a track-and-lock mechanism having a shape substantially matching the shape of said links so as to allow said links to move in a single direction.

155. A method of fabricating a medical stent, comprising:
(a) cutting a first cylinder of electrically conductive material so as to create a first pattern of conductive mesh strands having a plurality of nodes;
(b) cutting a second cylinder of electrically conductive material so as to create a first pattern of conductive mesh strands having a plurality of nodes;
(c) positioning the first cylinder into a volume of the second cylinder and positioning the first cylinder with respect to the second cylinder such the nodes of the first cylinder are close to the nodes of the second cylinder without the nodes of the first cylinder touching the nodes of the second cylinder; and (d) applying a non-conductive binding material to adjacent nodes of the two cylinders.

157. The method as claimed in claim 155, wherein the first cylinder and second cylinder are made of tantalum.

158. The method as claimed in claim 155, wherein the non-conductive binding material is silicon rubber.

159. The method as claimed in claim 155, wherein the non-conductive binding material is a thermoplastic.

160. The method as claimed in claim 155, wherein the non-conductive binding material is a thermoset polymer.

161. The method as claimed in claim 155, wherein the non-conductive binding material is glass.

162. The method as claimed in claim 155, wherein the conductive mesh stands include "Z" shaped segments to facilitate radial expansion of the medical stent.

163. A method of fabricating a medical scent, comprising:
(a) cutting a first cylinder of electrically conductive material so as to create a first pattern of conductive mesh strands having a plurality of nodes;
(b) cutting a second cylinder of electrically conductive material so as to create a first pattern of conductive mesh strands having a plurality of nodes;
(c) positioning the first cylinder into a volume of the second cylinder and positioning the first cylinder with respect to the second cylinder such the nodes of the first cylinder are close to the nodes of the second cylinder without the nodes of the first cylinder touching the nodes of the second cylinder;
(d) positioning a third cylinder of a non-conductive binding material between the first and second cylinders; and (e) applying heat to the adjacent nodes of the first and second cylinders to cause the non-conductive binding material to bind the adjacent nodes together.

164. The method as claimed in claim 163, wherein the first cylinder and second cylinder are made of tantalum.

165. The method as claimed in claim 163, wherein the non-conductive binding material is silicon rubber.

166. The method as claimed in claim 163, wherein the non-conductive binding material is a thermoplastic.

167. The method as claimed in claim 163, wherein the non-conductive binding material is a thermoset polymer.

168. The method as claimed in claim 163, wherein the non-conductive binding material is glass.

169. The method as claimed in claim 163, wherein the conductive mesh strands include "Z" shaped segments to facilitate radial expansion of the medical stent.

170. The method as claimed in claim 163, further comprising:
(e) applying heat to areas of non-adjacent nodes of the first and second cylinders to cause the non-conductive binding material to be removed.

171. A method of fabricating a medical stent, comprising:
(a) producing a web of conductive strands wherein at all the cross-over points, a non-conductive material is applied to hold the cross-over point strands in place and to electrically isolate the conductive strands from one another;
(b) cutting a portion of the web to produce a sheet of conductive strands;
(c) forming the sheet of conductive strands into a cylinder shape; and (d) attaching ends of sheet together to hold the cylinder shape in place.

172. The method as claimed in claim 171, wherein the ends of the sheet are attached with conductive material.

173. The method as claimed in claim 171, wherein the ends of the sheet are attached with non-conductive material.

174. The method as claimed in claim 155, wherein the first cylinder and second cylinder are made of nitinol.

175. The method as claimed in claim 155, wherein the first cylinder and second cylinder are made of stainless steel.

176. The method as claimed in claim 155, wherein the first cylinder and second cylinder are made of NbZr.

177. The method as claimed in claim 155, wherein the first cylinder and second cylinder are made of titanium.

178. The method as claimed in claim 163, wherein the first cylinder and second cylinder are made of nitinol.

179. The method as claimed in claim 163, wherein the first cylinder and second cylinder are made of stainless steel.

180. The method as claimed in claim 163, wherein the first cylinder and second cylinder are made of NbZr.

181. The method as claimed in claim 163, wherein the first cylinder and second cylinder are made of titanium.
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