US20050277832A1 - Percutaneous registration apparatus and method for use in computer-assisted surgical navigation - Google Patents

Percutaneous registration apparatus and method for use in computer-assisted surgical navigation Download PDF

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Publication number
US20050277832A1
US20050277832A1 US11/199,419 US19941905A US2005277832A1 US 20050277832 A1 US20050277832 A1 US 20050277832A1 US 19941905 A US19941905 A US 19941905A US 2005277832 A1 US2005277832 A1 US 2005277832A1
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Prior art keywords
implant
operable
inserter
rod
implant system
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Abandoned
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US11/199,419
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Kevin Foley
John Clayton
Anthony Melkent
Michael Sherman
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Medtronic Navigation Inc
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Surgical Navigation Technologies Inc
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Priority to US11/199,419 priority Critical patent/US20050277832A1/en
Assigned to SURGICAL NAVIGATION TECHNOLOGIES, INC. reassignment SURGICAL NAVIGATION TECHNOLOGIES, INC. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: FOLEY, KEVIN T., SHERMAN, MICHAEL C., CLAYTON, JOHN B., MELKANT, ANTHONY
Publication of US20050277832A1 publication Critical patent/US20050277832A1/en
Abandoned legal-status Critical Current

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    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61BDIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B17/00Surgical instruments, devices or methods, e.g. tourniquets
    • A61B17/56Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor
    • A61B17/58Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor for osteosynthesis, e.g. bone plates, screws, setting implements or the like
    • A61B17/68Internal fixation devices, including fasteners and spinal fixators, even if a part thereof projects from the skin
    • A61B17/70Spinal positioners or stabilisers ; Bone stabilisers comprising fluid filler in an implant
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61BDIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B17/00Surgical instruments, devices or methods, e.g. tourniquets
    • A61B17/56Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor
    • A61B17/58Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor for osteosynthesis, e.g. bone plates, screws, setting implements or the like
    • A61B17/68Internal fixation devices, including fasteners and spinal fixators, even if a part thereof projects from the skin
    • A61B17/70Spinal positioners or stabilisers ; Bone stabilisers comprising fluid filler in an implant
    • A61B17/7074Tools specially adapted for spinal fixation operations other than for bone removal or filler handling
    • A61B17/7083Tools for guidance or insertion of tethers, rod-to-anchor connectors, rod-to-rod connectors, or longitudinal elements
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61BDIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B34/00Computer-aided surgery; Manipulators or robots specially adapted for use in surgery
    • A61B34/20Surgical navigation systems; Devices for tracking or guiding surgical instruments, e.g. for frameless stereotaxis
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61BDIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B17/00Surgical instruments, devices or methods, e.g. tourniquets
    • A61B17/56Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor
    • A61B17/58Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor for osteosynthesis, e.g. bone plates, screws, setting implements or the like
    • A61B17/68Internal fixation devices, including fasteners and spinal fixators, even if a part thereof projects from the skin
    • A61B17/70Spinal positioners or stabilisers ; Bone stabilisers comprising fluid filler in an implant
    • A61B17/7001Screws or hooks combined with longitudinal elements which do not contact vertebrae
    • A61B17/7032Screws or hooks with U-shaped head or back through which longitudinal rods pass
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61BDIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B17/00Surgical instruments, devices or methods, e.g. tourniquets
    • A61B2017/00477Coupling
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61BDIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B34/00Computer-aided surgery; Manipulators or robots specially adapted for use in surgery
    • A61B34/20Surgical navigation systems; Devices for tracking or guiding surgical instruments, e.g. for frameless stereotaxis
    • A61B2034/2046Tracking techniques
    • A61B2034/2055Optical tracking systems
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61BDIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B34/00Computer-aided surgery; Manipulators or robots specially adapted for use in surgery
    • A61B34/20Surgical navigation systems; Devices for tracking or guiding surgical instruments, e.g. for frameless stereotaxis
    • A61B2034/2072Reference field transducer attached to an instrument or patient
    • 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
    • A61B2090/363Use of fiducial points
    • 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
    • A61B90/39Markers, e.g. radio-opaque or breast lesions markers
    • A61B2090/3937Visible markers
    • A61B2090/3945Active visible markers, e.g. light emitting diodes
    • 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
    • A61B90/39Markers, e.g. radio-opaque or breast lesions markers
    • A61B2090/3983Reference marker arrangements for use with image guided surgery
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61BDIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B34/00Computer-aided surgery; Manipulators or robots specially adapted for use in surgery
    • A61B34/10Computer-aided planning, simulation or modelling of surgical operations
    • 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
    • A61B90/10Instruments, 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 for stereotaxic surgery, e.g. frame-based stereotaxis
    • A61B90/11Instruments, 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 for stereotaxic surgery, e.g. frame-based stereotaxis with guides for needles or instruments, e.g. arcuate slides or ball joints

Definitions

  • the present teachings relate generally to guiding, directing, or navigating instruments or implants in a body percutaneously, in conjunction with systems that use and generate images during medical and surgical procedures, which images assist in executing the procedures and indicate the relative position of various body parts, surgical implants, and instruments.
  • the teachings relate to apparatus and minimally invasive procedures for navigating instruments and providing surgical implants percutaneously in the spine, for example, to stabilize the spine, correct deformity, or enhance fusion in conjunction with a surgical navigation system for generating images during medical and surgical procedures.
  • spinal surgical procedures used for example, to provide stabilization, fusion, or to correct deformities, require large incisions and substantial exposure of the spinal areas to permit the placement of surgical implants such as, for example, various forms of screws or hooks linked by rods, wires, or plates into portions of the spine.
  • This standard procedure is invasive and can result in trauma, blood loss, and post operative pain.
  • fluoroscopes have been used to assist in placing screws beneath the skin. In this alternative procedure at least four incisions must be made in the patient's back for inserting rods or wires through previously inserted screws.
  • Fluoroscopic screw placement techniques have traditionally used rods or plates that are subcutaneous to connect screws from vertebra to vertebra. This is due in part to the fact that there is no fluoroscopic technique that has been designed which can always adequately place rods or plates at the submuscular region (or adjacent to the vertebrae). These subcutaneous rods or plates may not be well tolerated by the patient. They also may not provide the optimal mechanical support to the spine because the moment arm of the construct can be increased, thereby translating higher loads and stresses through the construct.
  • Surgical navigation systems typically include tracking means such as, for example, an LED array on the body part, LED emitters on the medical instruments, a digitizer to track the positions of the body part and the instruments, and a display for the position of an instrument used in a medical procedure relative to an image of a body part.
  • tracking means such as, for example, an LED array on the body part, LED emitters on the medical instruments, a digitizer to track the positions of the body part and the instruments, and a display for the position of an instrument used in a medical procedure relative to an image of a body part.
  • Bucholz et al. WO 96/11624 is of particular interest, in that it identifies special issues associated with surgical navigation in the spine, where there are multiple vertebral bodies that can move with respect to each other.
  • Bucholz et al. describes a procedure for operating on the spine during an open process where, after imaging, the spinous process reference points may move with respect to each other. It also discloses a procedure for modifying and repositioning the image data set to match the actual position of the anatomical elements. When there is an opportunity for anatomical movement, such movement degrades the fidelity of the pre-procedural images in depicting the intra-procedural anatomy. Therefore, additional innovations are desirable to bring image guidance to the parts of the body experiencing anatomical movement.
  • spinal surgical procedures are typically highly invasive. There is, thus, a need for more minimally invasive techniques for performing these spinal procedures, such as biopsy, spinal fixation, endoscopy, spinal implant insertion, fusion, and insertion of drug delivery systems, by reducing incision size and amount.
  • One such way is to use surgical navigation equipment to perform procedures percutaneously, that is beneath the skin. To do so by means of surgical navigation also requires apparatus that can indicate the position of the spinal elements, such as, for example the vertebrae, involved in the procedure relative to the instruments and implants being inserted beneath the patient's skin and into the patient's spine. Additionally, because the spinal elements naturally move relative to each other, the user requires the ability to reorient these spinal elements to align with earlier scanned images stored in the surgical navigation system computer, to assure the correct location of those elements relative to the instruments and implants being applied or inserted percutaneously.
  • the present teachings are directed to apparatus and procedures for percutaneous placement of surgical implants and instruments such as, for example, screws, rods, wires and plates into various body parts using image guided surgery.
  • Various embodiments are directed to apparatus and procedures for the percutaneous placement of surgical implants and instruments into various elements of the spine using image guided surgery.
  • an apparatus for use with a surgical navigation system comprises an attaching device rigidly connected to a body part, such as the spinous process of a vertebrae, with an identification superstructure rigidly but removably connected to the attaching device.
  • This identification superstructure is a reference arc and fiducial array, which accomplishes the function of identifying the location of the superstructure, and, therefore, the body part to which it is fixed, during imaging by CAT scan or MRI, and later during medical procedures.
  • the attaching device is a clamp with jaws and sharp teeth for biting into the spinous process.
  • the fixture is a screw, having a head, wherein the screw is implanted into the spinous process and a relatively rigid wire is attached to the head of the screw and also implanted into the spinous process at an angle to the axis of the screw to prevent the screw from rotating in either direction.
  • the superstructure includes a central post, and a fiducial array and a reference arc rigidly but removably attached to the central post.
  • the fiducial array is composed of image-compatible materials, and includes fiducials for providing a reference point, indicating the position of the array, which are rigidly attached to the fiducial array, composed of, for example titanium or aluminum spheres.
  • the reference arc includes emitters, such as, for example Light Emitting Diodes (“LEDs”), passive reflective spheres, or other tracking means such as acoustic, magnetic, electromagnetic, radiologic, or micropulsed radar, for indicating the location of the reference arc and, thus, the body part it is attached to, during medical procedures.
  • LEDs Light Emitting Diodes
  • passive reflective spheres or other tracking means such as acoustic, magnetic, electromagnetic, radiologic, or micropulsed radar
  • a method for monitoring the location of an instrument, surgical implants and the various portions of the body, for example, vertebrae, to be operated on in a surgical navigation system comprising the steps of: attaching a fixture to the spinous process; attaching a superstructure including a fiducial array with fiducials and a reference arc to the fixture; scanning the patient using CT, MRI or some other three-dimensional method, with fiducial array rigidly fixed to patient to identify it on the scanned image; and thereafter, in an operating room, using image-guided technology, touching an image-guided surgical pointer or other instrument to one or more of the fiducials on the fiducial array to register the location of the spinal element fixed to the array and emitting an audio, visual, radiologic, magnetic or other detectable signal from the reference arc to an instrument such as, for example, a digitizer or other position-sensing unit, to indicate changes in position of the spinal element during a surgical procedure, and performing a surgical or medical procedure percutaneously on the patient using instruments
  • the method includes inserting screws or rigid wires in spinal elements in the area involved in the anticipated surgical procedure before scanning the patient, and after scanning the patient and bringing the patient to the operating area, touching an image-guided or tracked surgical pointer to these screws and wires attached to the vertebrae to positively register their location in the surgical navigation computer, and manipulating either the patient's spine or the image to align the actual position of the spinal elements with the scanned image.
  • the method includes percutaneously implanting screws into spinal elements, which screws are located using image guided surgical navigation techniques, and further manipulating the orientation of the screw heads percutaneously using a head-positioning probe containing an emitter, that can communicate to the surgical navigation computer the orientation of the screw heads and position them, by use of a specially designed head-positioning tool with an end portion that mates with the heads of the screws and can rotate those screw heads to receive a rod, wire, plate, or other connecting implant. If a rod is being inserted into the screw heads for example, the method further includes tracking the location and position of the rod, percutaneously using a rod inserter having one or more emitters communicating the location and orientation of the rod to the surgical navigation computer.
  • a system and method is provided to a user, such as a surgeon, to track an instrument and surgical implants used in conjunction with a surgical navigation system in such a manner to operate percutaneously on a patient's body parts, such as spinal vertebrae which can move relative to each other.
  • a system and method to simply and yet positively indicate to the user a change in position of body parts, such as spinal vertebrae segments, from that identified in a stored image scan, such as from an MRI or CAT scan, and provide a method to realign those body parts to correspond with a previously stored image or the image to correspond with the actual current position of the body parts.
  • body parts such as spinal vertebrae segments
  • a system or method for allowing a fiducial array or reference arc that is removable from a location rigidly fixed to a body part and replaceable back in that precise location is provided.
  • a system and method for positively generating a display of instruments and surgical implants such as, for example screws and rods, placed percutaneously in a patient using image-guided surgical methods and techniques.
  • a percutaneous reference array and fiducial array as described herein, to be used to register and track the position of the vertebrae for the purposes of targeting a radiation dose to a diseased portion of said vertebrae using a traditional radiosurgical technique.
  • FIG. 1 is a schematic diagram of various embodiments of a superstructure for use with the current teachings, including a reference arc, center post and fiducial array and rigid Kirschner wires (“K wires”) and screws placed in the spine for use with a surgical navigation system for percutaneous spinal surgical procedures.
  • K wires Kirschner wires
  • FIG. 1A is an enlarged view of the superstructure depicted in FIG. 1 engaging a vertebra by a clamp and also K wires implanted in adjacent vertebrae in the superior and inferior positions of the spinous process.
  • FIG. 2 is a diagram of various embodiments of a clamp fixture for rigid connection to the spinous process of a single vertebrae with an H-shaped fiducial array attached to a center post rigidly attached to the clamp and a mating connector at the tip of the post for mating with a reference array, and a reference array for use in the current invention.
  • FIG. 2A is a side view of FIG. 2 .
  • FIG. 2B is another side view of FIG. 2 .
  • FIG. 2C is a top view of FIG. 2 .
  • FIG. 2D is an exploded view of FIG. 2 without the reference arc.
  • FIG. 2E is an exploded view of the interface of the center post and clamp of FIG. 2 .
  • FIG. 3 is a diagram of a W-Shaped fiducial array mounted to a central post with generally spherical fiducials attached to the array, for mounting to a single vertebrae.
  • FIG. 3A is a side view of FIG. 3 .
  • FIG. 3B is another side view of FIG. 3 .
  • FIG. 3C is a top view of FIG. 3 .
  • FIG. 4 is a diagram of a reference arc and fiducial attached to a center post for use in the current invention in mounting to a single vertebrae.
  • FIG. 4A is a side view of FIG. 4 .
  • FIG. 4B is a back view of FIG. 4 .
  • FIG. 4C is a top view of FIG. 4 .
  • FIG. 4D is an expanded view of FIG. 4 .
  • FIG. 4E is an expanded side view of FIG. 4 .
  • FIG. 4F is an expanded view of the array foot and shoe of FIG. 4E .
  • FIG. 5 is a diagram according to various embodiments of a fixture using a cannulated screw for insertion into a vertebrae, with Kirschner wire mounted on a central post and including a fiduciary array and reference arc combined on a single structure.
  • FIG. 6 is a side view of the screw and Kirschner wire fixture of FIG. 5 implanted in a spinous process of a vertebrae.
  • FIG. 7 is a diagram of a screw-head positioning probe and multiaxial screw for insertion into a single vertebrae.
  • FIG. 7A is a diagram of the screw of FIG. 7 .
  • FIG. 8 is a diagram of a head positioning probe, multiaxial screw and spinal segment.
  • FIG. 9 is a diagram of a rod inserter with an LED.
  • FIG. 10 is a diagram of various embodiments of the teachings including a cannulated tube and attachment for holding a reference arc.
  • FIG. 11 is a diagram of the cannulated tube of FIG. 10 with a reference arc and screw for attachment to a spinal process.
  • FIG. 12 is a posterior view of spinal segment and implanted screws before alignment.
  • FIG. 13 is a posterior view of spinal segment and implanted screws after alignment.
  • FIG. 1 a typical surgical navigation system is shown in FIG. 1 .
  • a computer assisted image-guided surgery system indicated generally at 10 , generates an image for display on a monitor 106 representing the position of one or more body elements, such as spinal elements fixedly held in a stabilizing frame or device such as a spinal surgery frame 125 commonly used for spinal surgery.
  • a reference arc 120 bearing tracking means or emitters, such as for example LED emitters 122 is mounted to the spinous process by a central post 150 .
  • the structures 20 and K wires 260 of FIG. 1 are depicted in more detail in FIG. 1A .
  • the image 105 is generated from an image data set, usually generated preoperatively by a CAT scanner or by MRI for example, which image 105 has reference points for at least one body element, such as a spinal element or vertebrae.
  • the reference points of the particular body element have a fixed spatial relation to the particular body element.
  • the system includes an apparatus such as a digitizer or other Position Sensing Unit (PSU), such as for example sensor array 110 on support 112 for identifying, during the procedure, the relative position of each of the reference points to be displayed by tracking the position of emitters 122 on arc 120 .
  • the system also includes a processor 114 such as a PC or other suitable workstation processor associated with controller 108 for modifying the image data set according to the identified relative position of each of the reference points during the procedure, as identified by digitizer 110 .
  • the processor 114 can then, for example, generate an image data set representing the position of the body elements during the procedure for display on monitor 106 .
  • a surgical instrument 130 such as a probe or drill or other tool, may be included in the system, which is positioned relative to a body part and similarly tracked by sensor array 110 .
  • a registration device 20 is rigidly fixed to a spinal element by, for example, a device such as a bone clamp 30 depicted in FIG. 2 .
  • a screw retention device 40 such as the cannulated screw 42 depicted in FIG. 5 , and described in more detail below, can be used.
  • the clamp 30 includes at least two blades (or jaws) 32 with tips or teeth 34 , which are preferably sharp, for driving together and penetrating soft tissue or more dense bone for rigid fixation to the spinous process.
  • the teeth 34 are also preferably sized to accommodate the bulb shape of the spinous process.
  • the driving mechanism 40 is, for example, a screw driven into a sleeve 41 and is also preferably located such that it will be accessible in a percutaneous manner. Attached to the clamp 30 is a superstructure 20 .
  • the superstructure 20 includes a central post 150 which is relocatable, that is, it fixes to the clamp 30 in a rigid fashion, for example, as depicted in FIGS. 2D and 2E , by being inserted into a V-shaped wedge 44 orienting the post 150 front to back and providing a mating hole 48 along the wedge 44 for insertion of post 150 in a single orientation and also providing fasteners such as screw 43 for tightening to lock the post 150 in place.
  • the post 150 can be removed and reapplied by loosening and tightening screw 43 , such that the original geometry and orientation is maintained.
  • the central post 150 has at its apex a connector 60 with unique geometrical configuration, such as, for example, a starburst, onto which a spinal reference arc 120 of the superstructure 20 attaches.
  • a spinal reference arc 120 can be used, such as depicted in FIGS. 1A, 4 , and 11 , preferably including emitters 122 , such as for example LEDs or reflective spheres for providing a positive indication of movement to the surgical navigation system during a procedure.
  • a fiducial array 170 which can be of various different shapes, such as, for example the H-shaped frame 170 depicted in FIG. 2 , the W-shaped frame 170 ′ as depicted in FIG. 3 , the U-shaped frame 170 ′′ as depicted in FIG. 4 or the X-shaped frame 120 ′, 170 ′′′ depicted in FIG. 5 (depicting a structure that is both a fiducial array and a reference arc). As depicted in FIGS.
  • this array can include fiducial points 29 or spheres 17 , rigidly attached to fiducial array 170 , 170 ′ and is, for example, as depicted in FIG. 3 , substantially in the shape of spheres 17 and of a material detectable by the CAT scan or MRI, preferably titanium or aluminum.
  • This fiducial array such as 170 indicates to the surgical navigation system the location of the bone structure to which the clamp 30 and central post 150 are attached by touching a pointed surgical tracker to fiducial points 29 or a cup-shaped probe to fiducial spheres 17 , thereby indicating the center of the fiducial to the surgical navigation controller 114 .
  • the array 170 and central post 150 are also attached to the clamp 30 , as described above, in such a way that they can be removed and replaced in the same geometric orientation and location, for example, by means of a uniquely shaped interface, for example, a triangle, or a single unique shape or a combination of unique angles or pins with the clamp 30 such that the post 150 can only be reinserted the same way it was removed.
  • a uniquely shaped interface for example, a triangle, or a single unique shape or a combination of unique angles or pins
  • the fiducial array 170 can be located at various heights on the post 150 to accommodate variations in patient tissue depth and size, preferably as close to the patient's body as possible, and then fixed at that specific height by the use of pins or indents matched to holes 19 (shown in FIG. 2 ) in the central post 150 or by placing the rods 39 of H-shaped array 170 in different holes 31 .
  • the fiducial array 170 also has, for example, divots 29 (shown in FIG. 2 ) shaped to interface with an instrument such as a surgical pointer 130 which can touch that divot 29 to register the location of the divot 29 and, thus, the location of the fiducial array 170 and likewise the spinal element in the surgical navigation system.
  • the fiducials 17 or 29 can be mounted in a manner such that they can be adjusted, for example by mounting them on a rotatable or collapsible arm 66 (as depicted in FIG. 3 ) that pivots and folds together, to get the maximum distance between fiducials while not dramatically increasing the field of view required at the time of scanning.
  • a screw 42 and rigid wire 45 attachment may be used to rigidly attach the central post of the superstructure 20 to a body element, such as, for example, a vertebrae.
  • a body element such as, for example, a vertebrae.
  • screw 42 is screwed into the spinal process of spinal element 100 .
  • a rigid wire 45 , post, or other sufficiently rigid fastener such as for example a Kirschner wire (K-wire)
  • K-wire Kirschner wire
  • FIGS. 10 and 11 Another embodiment for preventing the superstructure 20 from rotating as depicted in FIGS. 10 and 11 includes the insertion of a screw 85 through a cannulated tube 86 which has teeth 89 in the end (or V-shaped end) that would bite into the tip of the spinous process, preventing rotation.
  • clamp 30 of FIG. 2 or screw 42 and K-Wire 45 of FIG. 5 are implanted percutaneously through a small incision in the skin and rigidly attached to the spinal process. This attachment occurs with the clamp 30 , by driving the blades 32 of the clamp 30 together to hold the spinous process rigidly.
  • the central post 150 is then rigidly fixed to the clamp 30 or screw 42 and the fiducial array 170 is rigidly fixed to the central post 150 .
  • the patient is then scanned and imaged with a CAT scan or MRI with a field of view sufficiently large to display the spinal anatomy and the clamp 30 or screw 42 and the fiducial array 170 . This scan is loaded into the surgical navigation system processor 104 .
  • the array 120 and post 150 can be removed from the patient, while leaving in place the rigidly connected clamp 30 or screw 42 .
  • a foot 55 located below array 170 ′′ engages with shoe 56 and rigidly connected by screws 57 and 58 .
  • the post 150 , array 120 and other remaining portions of the superstructure 20 once removed, may be sterilized. The patient is then moved to the operating room or similar facility from, for example, the scanning room.
  • the patient may be positioned in an apparatus, such as, for example, a spinal surgery frame 125 to help keep the spinal elements in a particular position and relatively motionless.
  • the superstructure 20 is then replaced on the clamp 30 or screw 42 in a precise manner to the same relative position to the spinal elements as it was in the earlier CAT scan or MRI imaging.
  • the reference arc 120 is fixed to the starburst or other interface connector 60 on the central post 150 which is fixed to the clamp 30 or screw 42 .
  • the operator touches an instrument with a tracking emitter such as a surgical pointer 130 with emitters 195 to the divots 29 on the fiducial array 170 to register the location of the array 170 and, thus, because the spinal process is fixed to the fiducial array 170 , the location of the spinal element is also registered in the surgical navigation system.
  • a tracking emitter such as a surgical pointer 130 with emitters 195 to the divots 29 on the fiducial array 170 to register the location of the array 170 and, thus, because the spinal process is fixed to the fiducial array 170 , the location of the spinal element is also registered in the surgical navigation system.
  • any instrument 130 fitted with tracking emitters thereon such as, for example, a drill or screw driver, can be tracked in space relative to the spine in the surgical navigation system without further surgical exposure of the spine.
  • the position of the instrument 130 is determined by the user stepping on a foot pedal 116 to begin tracking the emitter array 190 .
  • the emitters 195 generate infrared signals to be picked up by camera digitizer array 110 and triangulated to determine the position of the instrument 130 .
  • other methods may be employed to track reference arcs, pointer probes, and other tracked instruments, such as with reflective spheres, or sound or magnetic emitters, instead of LED's.
  • reflective spheres can reflect infrared light that is emitted from the camera array 110 back to the camera array 110 .
  • the relative position of the body part, such as the spinal process is determined in a similar manner, through the use of similar emitters 122 mounted on the reference frame 120 in mechanical communication with the spinal segment.
  • the computer would illustrate a preoperative scan—such as the proper CAT scan slice—on the screen of monitor 106 which would indicate the position of the tool 130 and the spinal segment for the area of the spine involved in the medical procedure.
  • the fiducial array 170 can be removed from the central post 150 , by, for example, loosening screw 42 and sliding the array 170 off post 150 , leaving the reference arc 120 in place or replacing it after removal of array 170 .
  • the central post 150 , reference arc 120 , and fiducial array 170 can be removed after the spinal element has been registered leaving only the clamp 30 or screw 42 in place. The entire surgical field can then be sterilized and a sterile post 150 and reference arc 170 fixed to the clamp 30 or screw 42 with the registration maintained.
  • This surgical navigation system with spinal element registration maintained, can then be used, for example, to place necessary and desired screws, rods, hooks, plates, wires, and other surgical instruments and implants percutaneously, using image-guided technology.
  • image-guided technology Once the location of the spinal element 100 involved in the procedure is registered, by the process described above, in relation to the image data set and image 105 projected on monitor 106 , other instruments 130 and surgical implants can be placed under the patient's skin at locations indicated by the instrument 130 relative to the spinal element 100 .
  • the location of other spinal elements, relative to the spinal element 100 containing the fiducial array 170 can be registered in the surgical navigation system by, for example, inserting additional screws 250 , rigid wires 260 , or other rigid implants or imageable devices into the spinal segment.
  • additional screws 250 or rigid and pointed wires 260 are placed in the vertebrae adjacent to the vertebrae containing the clamp 30 and post 150 prior to scanning.
  • the surgeon can see the clamp 30 or screw 42 and fiducial array 170 and also the additional screws 250 , wires 260 or other imageable devices.
  • these screws 250 are used, these screws 250 (as depicted in FIG.
  • the head 7 may contain a divot 256 or other specially shaped interface on the head 255 so that a pointer probe 130 can be used to point to the head 255 of the screw 250 (or wire) and indicate the orientation of the screw 250 or wire 260 to the surgical navigation system by communicating to the controller 114 or by emission from LEDs 195 on probe 130 to digitizer 110 .
  • the image of these additional screws 250 also appear in the scan.
  • the image of the screw 250 can be compared to the actual position of the screw 250 as indicated by the pointer probe 130 that is touched to the head 255 of the screw 250 or wire 260 .
  • the operator can manipulate the position of the patient to move the spinal element and thus the location of the screw 250 or wire 260 to realign the spinal elements with the earlier image of the spine.
  • the operator can manipulate the image to correspond to the current position of the spinal segments.
  • the operator can place additional rigid wires 260 or screws 250 into the vertebrae, for example, located at the superior (toward the patient's head) and inferior (towards the patient's feet) ends of the spinal process to more accurately position those vertebrae relative to the other vertebrae and the image data.
  • the wires 260 and screws 250 implanted to provide positioning information can also be equipped with emitters, such as, for example, LEDs, to provide additional information to the surgical navigation system on the location of the wire 260 or screw 250 , and thus the vertebra to which they are affixed.
  • the patient can be placed in a position stabilizing device, such as a spinal surgery frame 125 or board, before a scan is taken, and then moved to the operating facility for the procedure, maintaining the spine segments in the same position from the time of scanning until the time of surgery.
  • a fluoroscope can be used to reposition the spinal segments relative to the earlier image from the scan.
  • An ultrasound probe can be used to take real-time images of the spinal segment which can be portrayed by monitor 106 overlayed or superimposed on image 105 . Then the operator can manually manipulate the spinal elements and take additional images of these elements with the fluoroscope to, in an iterative fashion, align the spinal elements with the previously scanned image 105 .
  • a clamp 30 or screw 42 and superstructure 20 can be rigidly fixed to each vertebra involved in the surgical or medical procedure to register the position of each vertebra as explained previously for a single vertebra.
  • spinal implants, endoscopes, or biopsy probes can be passed into the spine and procedures such as, for example, spinal fusion, manipulation, or disc removal can be performed percutaneously and facilitated by the surgical navigation image-guiding system.
  • a radiation dose can be targeted to a specific region of the vertebrae.
  • screws and rods fixed to different vertebra in a spine to stabilize them.
  • screws for example multiaxial screws 250
  • FIG. 12 the percutaneous insertion of screws and rods, fixed to different vertebra in a spine to stabilize them.
  • screws for example multiaxial screws 250
  • FIG. 12 the percutaneous insertion of screws and rods, fixed to different vertebra in a spine to stabilize them.
  • This probe 280 includes a head 285 that mates in a geometrically unique fashion with the head 255 of the screw 250 .
  • An emitter such as, for example, an LED array 380 on the probe 280 , indicates the location and orientation of the screw head 255 to the computer 114 of the surgical navigation system by providing an optical signal received by digitizer 110 .
  • the screw head 255 can then be rotatably manipulated under the patient's skin by the head positioning probe 280 to be properly oriented for the receipt of a rod 360 inserted through the rotating head 255 .
  • the operator can then plan a path from the head 255 of each screw 250 to the other screws 250 to be connected. Then, with reference now to FIG.
  • an optically tracked rod inserter 245 also equipped with emitters, such as, for example LEDs 247 , can be placed through another small incision to mate with and guide a rod 360 through the holes or slots in the screw heads 245 , through and beneath various tissues of the patient, with the rod inserter 245 , and, therefore, the rod 360 , fixed to the inserter 245 , being tracked in the surgical navigation system.
  • the operator can also use the computer 114 to determine the required bending angles of the rod 360 .
  • the geometry of the screws 250 could be loaded into the computer 114 and when the position and orientation of the head 255 is given to the computer 114 via the probe 280 , the computer 114 could place this geometry onto the image data and three-dimensional model.
  • the rod 360 geometry could also be loaded into the computer 114 and could be visible and shown in real time on monitor 106 as the operator is placing it in the screw heads 255 .
  • one or more plates and/or one or more wires may be inserted instead of one or more rods 360 .

Abstract

An apparatus and procedures for percutaneous placement of surgical implants and instruments such as, for example, screws, rods, wires and plates into various body parts using image guided surgery. An apparatus for use with a surgical navigation system, an attaching device rigidly connected to a body part, such as the spinous process of a vertebrae, with an identification superstructure rigidly but removably connected to the attaching device. This identification superstructure, for example, is a reference arc and fiducial array which accomplishes the function of identifying the location of the superstructure, and, therefore, the body part to which it is fixed, during imaging by CAT scan or MRI, and later during medical procedures.

Description

    CROSS-REFERENCE TO RELATED APPLICATIONS
  • This application is a continuation of U.S. patent application Ser. No. 10/423,332 filed on Apr. 24, 2003; which is a reissue of Ser. No. 09/148,498 filed Sep. 4, 1998 which is now U.S. Pat. No. 6,226,548 issued on May 1, 2001; which claims rights under 35 U.S.C. §119 on provisional application No. 60/059,915, filed on Sep. 24, 1997. The disclosures of the above applications are incorporated herein by reference.
  • FIELD
  • The present teachings relate generally to guiding, directing, or navigating instruments or implants in a body percutaneously, in conjunction with systems that use and generate images during medical and surgical procedures, which images assist in executing the procedures and indicate the relative position of various body parts, surgical implants, and instruments. In particular the teachings relate to apparatus and minimally invasive procedures for navigating instruments and providing surgical implants percutaneously in the spine, for example, to stabilize the spine, correct deformity, or enhance fusion in conjunction with a surgical navigation system for generating images during medical and surgical procedures.
  • BACKGROUND
  • Typically, spinal surgical procedures used, for example, to provide stabilization, fusion, or to correct deformities, require large incisions and substantial exposure of the spinal areas to permit the placement of surgical implants such as, for example, various forms of screws or hooks linked by rods, wires, or plates into portions of the spine. This standard procedure is invasive and can result in trauma, blood loss, and post operative pain. Alternatively, fluoroscopes have been used to assist in placing screws beneath the skin. In this alternative procedure at least four incisions must be made in the patient's back for inserting rods or wires through previously inserted screws. However, this technique can be difficult in that fluoroscopes only provide two-dimensional images and require the surgeon to rotate the fluoroscope frequently in order to get a mental image of the anatomy in three dimensions. Fluoroscopes also generate radiation to which the patient and surgical staff may become over exposed over time. Additionally, the subcutaneous implants required for this procedure may irritate the patient. A lever arm effect can also occur with the screws that are not connected by the rods or wires at the spine. Fluoroscopic screw placement techniques have traditionally used rods or plates that are subcutaneous to connect screws from vertebra to vertebra. This is due in part to the fact that there is no fluoroscopic technique that has been designed which can always adequately place rods or plates at the submuscular region (or adjacent to the vertebrae). These subcutaneous rods or plates may not be well tolerated by the patient. They also may not provide the optimal mechanical support to the spine because the moment arm of the construct can be increased, thereby translating higher loads and stresses through the construct.
  • A number of different types of surgical navigation systems have been described that include indications of the positions of medical instruments and patient anatomy used in medical or surgical procedures. For example, U.S. Pat. No. 5,383,454 to Bucholz; PCT Application No. PCT/US94/04530 (Publication No. WO 94/24933) to Bucholz; and PCT Application No. PCT/US95/12894 (Publication No. WO 96/11624) to Bucholz et al., the entire disclosures of which are incorporated herein by reference, disclose systems for use during a medical or surgical procedure using scans generated by a scanner prior to the procedure. Surgical navigation systems typically include tracking means such as, for example, an LED array on the body part, LED emitters on the medical instruments, a digitizer to track the positions of the body part and the instruments, and a display for the position of an instrument used in a medical procedure relative to an image of a body part.
  • Bucholz et al. WO 96/11624 is of particular interest, in that it identifies special issues associated with surgical navigation in the spine, where there are multiple vertebral bodies that can move with respect to each other. Bucholz et al. describes a procedure for operating on the spine during an open process where, after imaging, the spinous process reference points may move with respect to each other. It also discloses a procedure for modifying and repositioning the image data set to match the actual position of the anatomical elements. When there is an opportunity for anatomical movement, such movement degrades the fidelity of the pre-procedural images in depicting the intra-procedural anatomy. Therefore, additional innovations are desirable to bring image guidance to the parts of the body experiencing anatomical movement.
  • Furthermore, spinal surgical procedures are typically highly invasive. There is, thus, a need for more minimally invasive techniques for performing these spinal procedures, such as biopsy, spinal fixation, endoscopy, spinal implant insertion, fusion, and insertion of drug delivery systems, by reducing incision size and amount. One such way is to use surgical navigation equipment to perform procedures percutaneously, that is beneath the skin. To do so by means of surgical navigation also requires apparatus that can indicate the position of the spinal elements, such as, for example the vertebrae, involved in the procedure relative to the instruments and implants being inserted beneath the patient's skin and into the patient's spine. Additionally, because the spinal elements naturally move relative to each other, the user requires the ability to reorient these spinal elements to align with earlier scanned images stored in the surgical navigation system computer, to assure the correct location of those elements relative to the instruments and implants being applied or inserted percutaneously.
  • In light of the foregoing, there is a need in the art for apparatus and minimally invasive procedures for percutaneous placement of surgical implants and instruments in the spine, reducing the size and amount of incisions and utilizing surgical navigation techniques.
  • SUMMARY
  • Accordingly, the present teachings are directed to apparatus and procedures for percutaneous placement of surgical implants and instruments such as, for example, screws, rods, wires and plates into various body parts using image guided surgery. Various embodiments are directed to apparatus and procedures for the percutaneous placement of surgical implants and instruments into various elements of the spine using image guided surgery.
  • To achieve these objects and other advantages and in accordance with the purpose of the invention, as embodied and broadly described herein, an apparatus for use with a surgical navigation system and comprises an attaching device rigidly connected to a body part, such as the spinous process of a vertebrae, with an identification superstructure rigidly but removably connected to the attaching device. This identification superstructure is a reference arc and fiducial array, which accomplishes the function of identifying the location of the superstructure, and, therefore, the body part to which it is fixed, during imaging by CAT scan or MRI, and later during medical procedures.
  • According to various embodiments, the attaching device is a clamp with jaws and sharp teeth for biting into the spinous process.
  • According to various embodiments, the fixture is a screw, having a head, wherein the screw is implanted into the spinous process and a relatively rigid wire is attached to the head of the screw and also implanted into the spinous process at an angle to the axis of the screw to prevent the screw from rotating in either direction.
  • According to various embodiments, the superstructure includes a central post, and a fiducial array and a reference arc rigidly but removably attached to the central post. The fiducial array is composed of image-compatible materials, and includes fiducials for providing a reference point, indicating the position of the array, which are rigidly attached to the fiducial array, composed of, for example titanium or aluminum spheres. The reference arc includes emitters, such as, for example Light Emitting Diodes (“LEDs”), passive reflective spheres, or other tracking means such as acoustic, magnetic, electromagnetic, radiologic, or micropulsed radar, for indicating the location of the reference arc and, thus, the body part it is attached to, during medical procedures.
  • According to various embodiments, a method for monitoring the location of an instrument, surgical implants and the various portions of the body, for example, vertebrae, to be operated on in a surgical navigation system comprising the steps of: attaching a fixture to the spinous process; attaching a superstructure including a fiducial array with fiducials and a reference arc to the fixture; scanning the patient using CT, MRI or some other three-dimensional method, with fiducial array rigidly fixed to patient to identify it on the scanned image; and thereafter, in an operating room, using image-guided technology, touching an image-guided surgical pointer or other instrument to one or more of the fiducials on the fiducial array to register the location of the spinal element fixed to the array and emitting an audio, visual, radiologic, magnetic or other detectable signal from the reference arc to an instrument such as, for example, a digitizer or other position-sensing unit, to indicate changes in position of the spinal element during a surgical procedure, and performing a surgical or medical procedure percutaneously on the patient using instruments and implants locatable relative to spinal elements in a known position in the surgical navigation system.
  • In another aspect, the method includes inserting screws or rigid wires in spinal elements in the area involved in the anticipated surgical procedure before scanning the patient, and after scanning the patient and bringing the patient to the operating area, touching an image-guided or tracked surgical pointer to these screws and wires attached to the vertebrae to positively register their location in the surgical navigation computer, and manipulating either the patient's spine or the image to align the actual position of the spinal elements with the scanned image.
  • In another aspect, the method includes percutaneously implanting screws into spinal elements, which screws are located using image guided surgical navigation techniques, and further manipulating the orientation of the screw heads percutaneously using a head-positioning probe containing an emitter, that can communicate to the surgical navigation computer the orientation of the screw heads and position them, by use of a specially designed head-positioning tool with an end portion that mates with the heads of the screws and can rotate those screw heads to receive a rod, wire, plate, or other connecting implant. If a rod is being inserted into the screw heads for example, the method further includes tracking the location and position of the rod, percutaneously using a rod inserter having one or more emitters communicating the location and orientation of the rod to the surgical navigation computer.
  • According to various embodiments, a system and method is provided to a user, such as a surgeon, to track an instrument and surgical implants used in conjunction with a surgical navigation system in such a manner to operate percutaneously on a patient's body parts, such as spinal vertebrae which can move relative to each other.
  • According to various embodiments, is provided a system and method to simply and yet positively indicate to the user a change in position of body parts, such as spinal vertebrae segments, from that identified in a stored image scan, such as from an MRI or CAT scan, and provide a method to realign those body parts to correspond with a previously stored image or the image to correspond with the actual current position of the body parts.
  • According to various embodiments, is provided a system or method for allowing a fiducial array or reference arc that is removable from a location rigidly fixed to a body part and replaceable back in that precise location.
  • According to various embodiments, is provided a system and method for positively generating a display of instruments and surgical implants, such as, for example screws and rods, placed percutaneously in a patient using image-guided surgical methods and techniques.
  • According to various embodiments, is provided a percutaneous reference array and fiducial array, as described herein, to be used to register and track the position of the vertebrae for the purposes of targeting a radiation dose to a diseased portion of said vertebrae using a traditional radiosurgical technique.
  • Additional application of the teachings will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the teaching. The applications of the teachings will be realized and attained by means of the elements and combinations particularly pointed out in this description.
  • It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive.
  • Further areas of applicability of the present teachings will become apparent from the detailed description provided hereinafter. It should be understood that the detailed description and various examples, while indicating various embodiments, are intended for purposes of illustration only and are not intended to limit the scope of the teachings.
  • BRIEF DESCRIPTION OF THE DRAWINGS
  • The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate various embodiments of the teachings and together with the description, serve to explain the principles of the invention.
  • FIG. 1 is a schematic diagram of various embodiments of a superstructure for use with the current teachings, including a reference arc, center post and fiducial array and rigid Kirschner wires (“K wires”) and screws placed in the spine for use with a surgical navigation system for percutaneous spinal surgical procedures.
  • FIG. 1A is an enlarged view of the superstructure depicted in FIG. 1 engaging a vertebra by a clamp and also K wires implanted in adjacent vertebrae in the superior and inferior positions of the spinous process.
  • FIG. 2 is a diagram of various embodiments of a clamp fixture for rigid connection to the spinous process of a single vertebrae with an H-shaped fiducial array attached to a center post rigidly attached to the clamp and a mating connector at the tip of the post for mating with a reference array, and a reference array for use in the current invention.
  • FIG. 2A is a side view of FIG. 2.
  • FIG. 2B is another side view of FIG. 2.
  • FIG. 2C is a top view of FIG. 2.
  • FIG. 2D is an exploded view of FIG. 2 without the reference arc.
  • FIG. 2E is an exploded view of the interface of the center post and clamp of FIG. 2.
  • FIG. 3 is a diagram of a W-Shaped fiducial array mounted to a central post with generally spherical fiducials attached to the array, for mounting to a single vertebrae.
  • FIG. 3A is a side view of FIG. 3.
  • FIG. 3B is another side view of FIG. 3.
  • FIG. 3C is a top view of FIG. 3.
  • FIG. 4 is a diagram of a reference arc and fiducial attached to a center post for use in the current invention in mounting to a single vertebrae.
  • FIG. 4A is a side view of FIG. 4.
  • FIG. 4B is a back view of FIG. 4.
  • FIG. 4C is a top view of FIG. 4.
  • FIG. 4D is an expanded view of FIG. 4.
  • FIG. 4E is an expanded side view of FIG. 4.
  • FIG. 4F is an expanded view of the array foot and shoe of FIG. 4E.
  • FIG. 5 is a diagram according to various embodiments of a fixture using a cannulated screw for insertion into a vertebrae, with Kirschner wire mounted on a central post and including a fiduciary array and reference arc combined on a single structure.
  • FIG. 6 is a side view of the screw and Kirschner wire fixture of FIG. 5 implanted in a spinous process of a vertebrae.
  • FIG. 7 is a diagram of a screw-head positioning probe and multiaxial screw for insertion into a single vertebrae.
  • FIG. 7A is a diagram of the screw of FIG. 7.
  • FIG. 8 is a diagram of a head positioning probe, multiaxial screw and spinal segment.
  • FIG. 9 is a diagram of a rod inserter with an LED.
  • FIG. 10 is a diagram of various embodiments of the teachings including a cannulated tube and attachment for holding a reference arc.
  • FIG. 11 is a diagram of the cannulated tube of FIG. 10 with a reference arc and screw for attachment to a spinal process.
  • FIG. 12 is a posterior view of spinal segment and implanted screws before alignment.
  • FIG. 13 is a posterior view of spinal segment and implanted screws after alignment.
  • DETAILED DESCRIPTION OF THE VARIOUS EMBODIMENTS
  • Reference will now be made in detail to various embodiments, an example of which is illustrated in the accompanying drawings. Wherever possible, the same reference numbers will be used throughout the drawings to refer to the same or like parts. The following example is intended to be purely exemplary.
  • As generally described in PCT/US95/12894, the entire disclosure of which is incorporated herein by reference, a typical surgical navigation system is shown in FIG. 1. A computer assisted image-guided surgery system, indicated generally at 10, generates an image for display on a monitor 106 representing the position of one or more body elements, such as spinal elements fixedly held in a stabilizing frame or device such as a spinal surgery frame 125 commonly used for spinal surgery. A reference arc 120 bearing tracking means or emitters, such as for example LED emitters 122, is mounted to the spinous process by a central post 150. The structures 20 and K wires 260 of FIG. 1 are depicted in more detail in FIG. 1A. The image 105 is generated from an image data set, usually generated preoperatively by a CAT scanner or by MRI for example, which image 105 has reference points for at least one body element, such as a spinal element or vertebrae. The reference points of the particular body element have a fixed spatial relation to the particular body element.
  • The system includes an apparatus such as a digitizer or other Position Sensing Unit (PSU), such as for example sensor array 110 on support 112 for identifying, during the procedure, the relative position of each of the reference points to be displayed by tracking the position of emitters 122 on arc 120. The system also includes a processor 114 such as a PC or other suitable workstation processor associated with controller 108 for modifying the image data set according to the identified relative position of each of the reference points during the procedure, as identified by digitizer 110. The processor 114 can then, for example, generate an image data set representing the position of the body elements during the procedure for display on monitor 106. A surgical instrument 130, such as a probe or drill or other tool, may be included in the system, which is positioned relative to a body part and similarly tracked by sensor array 110.
  • In summary, the general operation of a surgical navigating system is well known in the art and need not further be described here.
  • With further reference to FIGS. 1 through 6, a registration device 20 is rigidly fixed to a spinal element by, for example, a device such as a bone clamp 30 depicted in FIG. 2. Alternatively, a screw retention device 40, such as the cannulated screw 42 depicted in FIG. 5, and described in more detail below, can be used.
  • With reference now to FIG. 2, bone clamp 30 is fixedly attached to the spinous process. The clamp 30 includes at least two blades (or jaws) 32 with tips or teeth 34, which are preferably sharp, for driving together and penetrating soft tissue or more dense bone for rigid fixation to the spinous process. The teeth 34 are also preferably sized to accommodate the bulb shape of the spinous process. The driving mechanism 40 is, for example, a screw driven into a sleeve 41 and is also preferably located such that it will be accessible in a percutaneous manner. Attached to the clamp 30 is a superstructure 20. The superstructure 20 includes a central post 150 which is relocatable, that is, it fixes to the clamp 30 in a rigid fashion, for example, as depicted in FIGS. 2D and 2E, by being inserted into a V-shaped wedge 44 orienting the post 150 front to back and providing a mating hole 48 along the wedge 44 for insertion of post 150 in a single orientation and also providing fasteners such as screw 43 for tightening to lock the post 150 in place. The post 150 can be removed and reapplied by loosening and tightening screw 43, such that the original geometry and orientation is maintained. The central post 150 has at its apex a connector 60 with unique geometrical configuration, such as, for example, a starburst, onto which a spinal reference arc 120 of the superstructure 20 attaches. Any such standard reference arc 120 can be used, such as depicted in FIGS. 1A, 4, and 11, preferably including emitters 122, such as for example LEDs or reflective spheres for providing a positive indication of movement to the surgical navigation system during a procedure.
  • Also rigidly attached to the central post 150, as part of the superstructure 20 preferably at a location closer to the skin, or possibly collocated with or also performing the function of the reference arc 120, is a fiducial array 170, which can be of various different shapes, such as, for example the H-shaped frame 170 depicted in FIG. 2, the W-shaped frame 170′ as depicted in FIG. 3, the U-shaped frame 170″ as depicted in FIG. 4 or the X-shaped frame 120′, 170′″ depicted in FIG. 5 (depicting a structure that is both a fiducial array and a reference arc). As depicted in FIGS. 2 and 3, this array can include fiducial points 29 or spheres 17, rigidly attached to fiducial array 170, 170′ and is, for example, as depicted in FIG. 3, substantially in the shape of spheres 17 and of a material detectable by the CAT scan or MRI, preferably titanium or aluminum. This fiducial array such as 170 indicates to the surgical navigation system the location of the bone structure to which the clamp 30 and central post 150 are attached by touching a pointed surgical tracker to fiducial points 29 or a cup-shaped probe to fiducial spheres 17, thereby indicating the center of the fiducial to the surgical navigation controller 114. The array 170 and central post 150 are also attached to the clamp 30, as described above, in such a way that they can be removed and replaced in the same geometric orientation and location, for example, by means of a uniquely shaped interface, for example, a triangle, or a single unique shape or a combination of unique angles or pins with the clamp 30 such that the post 150 can only be reinserted the same way it was removed.
  • Additionally, the fiducial array 170, can be located at various heights on the post 150 to accommodate variations in patient tissue depth and size, preferably as close to the patient's body as possible, and then fixed at that specific height by the use of pins or indents matched to holes 19 (shown in FIG. 2) in the central post 150 or by placing the rods 39 of H-shaped array 170 in different holes 31. The fiducial array 170 also has, for example, divots 29 (shown in FIG. 2) shaped to interface with an instrument such as a surgical pointer 130 which can touch that divot 29 to register the location of the divot 29 and, thus, the location of the fiducial array 170 and likewise the spinal element in the surgical navigation system. Multiple divots can be registered to further increase accuracy of the registration system. In one preferred embodiment of the array, the fiducials 17 or 29 can be mounted in a manner such that they can be adjusted, for example by mounting them on a rotatable or collapsible arm 66 (as depicted in FIG. 3) that pivots and folds together, to get the maximum distance between fiducials while not dramatically increasing the field of view required at the time of scanning.
  • Alternatively, rather than using clamp 30, a screw 42 and rigid wire 45 attachment, as depicted in FIGS. 5 and 6, may be used to rigidly attach the central post of the superstructure 20 to a body element, such as, for example, a vertebrae. As depicted in FIG. 6, screw 42 is screwed into the spinal process of spinal element 100. A rigid wire 45, post, or other sufficiently rigid fastener such as for example a Kirschner wire (K-wire), is inserted through the cannulation in the center of post 150 and the screw 42 or is otherwise fixed to the screw 42, and exits the tip of the screw 42 at some angle, and is also implanted into the spinal element 100 to prevent the screw 42 from rotating in either direction.
  • Another embodiment for preventing the superstructure 20 from rotating as depicted in FIGS. 10 and 11 includes the insertion of a screw 85 through a cannulated tube 86 which has teeth 89 in the end (or V-shaped end) that would bite into the tip of the spinous process, preventing rotation.
  • Having described various embodiments of this apparatus of the present system, a method of using this apparatus for registering a single vertebrae will now be discussed. The operation of a surgical navigating system is generally well known and is described in PCT/US95/12894. According to various embodiments method of operation, clamp 30 of FIG. 2 or screw 42 and K-Wire 45 of FIG. 5 are implanted percutaneously through a small incision in the skin and rigidly attached to the spinal process. This attachment occurs with the clamp 30, by driving the blades 32 of the clamp 30 together to hold the spinous process rigidly. The central post 150 is then rigidly fixed to the clamp 30 or screw 42 and the fiducial array 170 is rigidly fixed to the central post 150. The patient is then scanned and imaged with a CAT scan or MRI with a field of view sufficiently large to display the spinal anatomy and the clamp 30 or screw 42 and the fiducial array 170. This scan is loaded into the surgical navigation system processor 104.
  • After scanning the patient, the array 120 and post 150 can be removed from the patient, while leaving in place the rigidly connected clamp 30 or screw 42. For example, as depicted in FIGS. 4D and 4E, a foot 55 located below array 170″ engages with shoe 56 and rigidly connected by screws 57 and 58. Before the surgical procedure, the post 150, array 120 and other remaining portions of the superstructure 20, once removed, may be sterilized. The patient is then moved to the operating room or similar facility from, for example, the scanning room.
  • Once in the operating room, the patient may be positioned in an apparatus, such as, for example, a spinal surgery frame 125 to help keep the spinal elements in a particular position and relatively motionless. The superstructure 20 is then replaced on the clamp 30 or screw 42 in a precise manner to the same relative position to the spinal elements as it was in the earlier CAT scan or MRI imaging. The reference arc 120 is fixed to the starburst or other interface connector 60 on the central post 150 which is fixed to the clamp 30 or screw 42. The operator, for example a surgeon, then touches an instrument with a tracking emitter such as a surgical pointer 130 with emitters 195 to the divots 29 on the fiducial array 170 to register the location of the array 170 and, thus, because the spinal process is fixed to the fiducial array 170, the location of the spinal element is also registered in the surgical navigation system.
  • Once the superstructure 20 is placed back on the patient, any instrument 130 fitted with tracking emitters thereon such as, for example, a drill or screw driver, can be tracked in space relative to the spine in the surgical navigation system without further surgical exposure of the spine. The position of the instrument 130 is determined by the user stepping on a foot pedal 116 to begin tracking the emitter array 190. The emitters 195 generate infrared signals to be picked up by camera digitizer array 110 and triangulated to determine the position of the instrument 130. Additionally, other methods may be employed to track reference arcs, pointer probes, and other tracked instruments, such as with reflective spheres, or sound or magnetic emitters, instead of LED's. For example, reflective spheres can reflect infrared light that is emitted from the camera array 110 back to the camera array 110. The relative position of the body part, such as the spinal process is determined in a similar manner, through the use of similar emitters 122 mounted on the reference frame 120 in mechanical communication with the spinal segment. As is well known in this art and described generally in PCT/US95/12894, based upon the relative position of the spinal segment and the instrument 130 (such as by touching a known reference point) the computer would illustrate a preoperative scan—such as the proper CAT scan slice—on the screen of monitor 106 which would indicate the position of the tool 130 and the spinal segment for the area of the spine involved in the medical procedure.
  • For better access by the operator of various areas near the central post 150, the fiducial array 170 can be removed from the central post 150, by, for example, loosening screw 42 and sliding the array 170 off post 150, leaving the reference arc 120 in place or replacing it after removal of array 170. By leaving the reference arc 120 in place, the registration of the location of the spinal process is maintained. Additionally, the central post 150, reference arc 120, and fiducial array 170 can be removed after the spinal element has been registered leaving only the clamp 30 or screw 42 in place. The entire surgical field can then be sterilized and a sterile post 150 and reference arc 170 fixed to the clamp 30 or screw 42 with the registration maintained.
  • This surgical navigation system, with spinal element registration maintained, can then be used, for example, to place necessary and desired screws, rods, hooks, plates, wires, and other surgical instruments and implants percutaneously, using image-guided technology. Once the location of the spinal element 100 involved in the procedure is registered, by the process described above, in relation to the image data set and image 105 projected on monitor 106, other instruments 130 and surgical implants can be placed under the patient's skin at locations indicated by the instrument 130 relative to the spinal element 100.
  • Additionally, the location of other spinal elements, relative to the spinal element 100 containing the fiducial array 170, can be registered in the surgical navigation system by, for example, inserting additional screws 250, rigid wires 260, or other rigid implants or imageable devices into the spinal segment.
  • For example, as depicted in FIG. 1, and in more detail FIG. 1A, additional screws 250 or rigid and pointed wires 260 are placed in the vertebrae adjacent to the vertebrae containing the clamp 30 and post 150 prior to scanning. On the image 105 provided by monitor 106, the surgeon can see the clamp 30 or screw 42 and fiducial array 170 and also the additional screws 250, wires 260 or other imageable devices. When screws 250 or other devices are used, these screws 250 (as depicted in FIG. 7) may contain a divot 256 or other specially shaped interface on the head 255 so that a pointer probe 130 can be used to point to the head 255 of the screw 250 (or wire) and indicate the orientation of the screw 250 or wire 260 to the surgical navigation system by communicating to the controller 114 or by emission from LEDs 195 on probe 130 to digitizer 110. The image of these additional screws 250 also appear in the scan. Once the patient is then moved to the operating facility, rather than the scanning area, the image of the screw 250 can be compared to the actual position of the screw 250 as indicated by the pointer probe 130 that is touched to the head 255 of the screw 250 or wire 260. If necessary, the operator can manipulate the position of the patient to move the spinal element and thus the location of the screw 250 or wire 260 to realign the spinal elements with the earlier image of the spine. Alternatively, the operator can manipulate the image to correspond to the current position of the spinal segments.
  • For additional positioning information, the operator can place additional rigid wires 260 or screws 250 into the vertebrae, for example, located at the superior (toward the patient's head) and inferior (towards the patient's feet) ends of the spinal process to more accurately position those vertebrae relative to the other vertebrae and the image data. Additionally, the wires 260 and screws 250 implanted to provide positioning information can also be equipped with emitters, such as, for example, LEDs, to provide additional information to the surgical navigation system on the location of the wire 260 or screw 250, and thus the vertebra to which they are affixed.
  • Alternatively, the patient can be placed in a position stabilizing device, such as a spinal surgery frame 125 or board, before a scan is taken, and then moved to the operating facility for the procedure, maintaining the spine segments in the same position from the time of scanning until the time of surgery. Alternatively, a fluoroscope can be used to reposition the spinal segments relative to the earlier image from the scan. An ultrasound probe can be used to take real-time images of the spinal segment which can be portrayed by monitor 106 overlayed or superimposed on image 105. Then the operator can manually manipulate the spinal elements and take additional images of these elements with the fluoroscope to, in an iterative fashion, align the spinal elements with the previously scanned image 105.
  • Alternatively, a clamp 30 or screw 42 and superstructure 20 can be rigidly fixed to each vertebra involved in the surgical or medical procedure to register the position of each vertebra as explained previously for a single vertebra.
  • After the spinal elements are registered in the spine, various medical and surgical procedures can be performed on that patient. For example, spinal implants, endoscopes, or biopsy probes can be passed into the spine and procedures such as, for example, spinal fusion, manipulation, or disc removal can be performed percutaneously and facilitated by the surgical navigation image-guiding system. Additionally, a radiation dose can be targeted to a specific region of the vertebrae.
  • One such procedure facilitated by the apparatus and methods described above is the percutaneous insertion of screws and rods, fixed to different vertebra in a spine to stabilize them. Once screws, for example multiaxial screws 250, (as depicted in FIG. 12, before manipulation) are implanted through small incisions they can be manipulated by a head-positioning probe 280. The final position of screws 250 and heads 255 are depicted in FIG. 13. This probe 280, as depicted in FIG. 7, includes a head 285 that mates in a geometrically unique fashion with the head 255 of the screw 250. An emitter, such as, for example, an LED array 380 on the probe 280, indicates the location and orientation of the screw head 255 to the computer 114 of the surgical navigation system by providing an optical signal received by digitizer 110. The screw head 255 can then be rotatably manipulated under the patient's skin by the head positioning probe 280 to be properly oriented for the receipt of a rod 360 inserted through the rotating head 255. The operator can then plan a path from the head 255 of each screw 250 to the other screws 250 to be connected. Then, with reference now to FIG. 9, an optically tracked rod inserter 245 also equipped with emitters, such as, for example LEDs 247, can be placed through another small incision to mate with and guide a rod 360 through the holes or slots in the screw heads 245, through and beneath various tissues of the patient, with the rod inserter 245, and, therefore, the rod 360, fixed to the inserter 245, being tracked in the surgical navigation system. The operator can also use the computer 114 to determine the required bending angles of the rod 360. For greater visualization, the geometry of the screws 250 could be loaded into the computer 114 and when the position and orientation of the head 255 is given to the computer 114 via the probe 280, the computer 114 could place this geometry onto the image data and three-dimensional model. The rod 360 geometry could also be loaded into the computer 114 and could be visible and shown in real time on monitor 106 as the operator is placing it in the screw heads 255.
  • In an alternative procedure, one or more plates and/or one or more wires may be inserted instead of one or more rods 360.
  • It will be apparent to those skilled in the art that various modifications and variations can be made in the present teachings and in construction of this surgical navigation system without departing from the scope or spirit of the teachings. Other embodiments of the teachings will be apparent to those skilled in the art from consideration of the specification and practice of the teachings disclosed herein. It is intended that the specification and examples be considered as exemplary only.

Claims (53)

1. An implant system for facilitating percutaneous placement of an implant in an anatomy and adapted for use with a surgical navigation system to tracks positions of the implant system in space, said implant system comprising:
an implant inserter adapted to releasably attach to the implant; and
a position identification structure rigidly and removably attached to said implant inserter;
wherein said position identification structure includes an assembly for providing position information to the surgical navigation system.
2. The implant system of claim 1, wherein said position identification structure includes at least one optical emitter.
3. The implant system of claim 1, wherein said position identification structure includes at least one light emitting diode.
4. The implant system of claim 1, wherein said position identification structure includes a selected geometrical shape.
5. The implant system of claim 1, wherein said position identification structure includes at least one of reflective spheres, sound emitters, magnets, eletromagnets, light emitting diodes, or combinations thereof.
6. The implant system of claim 5, wherein said reflectors can reflect at least one of visible light, infrared light, ultraviolet light, or combinations thereof.
7. The implant system of claim 5, wherein said magnets or electromagnets are operable to produce a magnetic field.
8. The implant system of claim 1, further comprising:
a rod;
wherein said rod can form a portion of the surgical implant.
9. The implant system of claim 8, wherein said rod extends between a first end and a second end;
wherein said implant inserter is releasably attached to at least one of said first end, said second end, or combinations thereof.
10. The implant system of claim 8, wherein said rod holder is operable to assist in moving a rod along a selected path.
11. The implant system of claim 8, wherein said rod holder is operably interconnected with the implant to determine a position of at least a portion of the implant.
12. The implant system of claim 11, wherein the implant includes a
screw head and a rod;
wherein said position identification structure attached to said rod holder is operable to determine a position of the rod relative to the screw head.
13. The implant system of claim 1, wherein said implant inserter includes a rod holder.
14. The implant system of claim 1, further comprising:
a bone screw;
wherein said bone screw can form a portion of the implant.
15. The implant system of claim 14, wherein said bone screw includes a slot operable to be aligned.
16. The implant system of claim 15, further comprising:
a second screw having a slot operable to be aligned percutaneously with said bone screw.
17. The implant system of claim 1, further comprising:
an imaging system operable to produce image data of the anatomy.
18. The implant system of claim 17, further comprising:
a display;
wherein the position of the implant inserter, the position of the implant, or combinations thereof can be displayed on the display with the image data.
19. The implant system of claim 18, further comprising:
a bone screw operable to be positioned in the anatomy;
wherein the geometry of the bone screw can be displayed on said display relative to the image data.
20. The implant system of claim 19, wherein the position of the implant, the geometry of the screw, and combinations thereof can be used intra-operably to determine bending of a rod.
21. The implant system of claim 18, wherein the display allows for substantially percutaneous placements of the implant relative to the anatomy.
22. The implant system of claim 1, further comprising:
an optical tracking system; an acoustic tracking system; an electromagnetic tracking system; a micropulsed radar tracking system; or combinations thereof.
23. An implant system for facilitating percutaneous placement of an implant in an anatomy and adapted use with a surgical navigation system to track positions in space, said implant system comprising:
an implant inserter operably interconnected to the implant;
a reference structure operably interconnected with said implant inserter;
wherein said reference structure is operable with the surgical navigation system to determine a position of at least one of said implant inserter, said implant, said reference structure, or combinations thereof.
24. The implant system of claim 23, further comprising:
a rod;
wherein said rod can form a portion of the implant;
wherein said rod extends between a first end and a second end.
25. The implant system of claim 24, wherein said implant inserter is operable to be interconnected with at least one of said first end, said second end, or combinations thereof.
26. The implant system of claim 24, wherein said implant inserter is operable to assist in moving said rod along a selected path.
27. The implant system of claim 26, further comprising:
a bone screw;
wherein said bone screw can form a portion of the implant.
28. The implant system of claim 27, wherein the surgical navigation system assists in displaying a position of said rod relative to said bone screw to intra-operatively determine a configuration of said rod.
29. The implant system of claim 23, wherein said position identification structure includes a selected geometrical shape.
30. The implant system of claim 23, wherein said position identification structure includes at least one of reflective spheres, sound emitters, magnets, electromagnets, emitting members, or combinations thereof.
31. The implant system of claim 24, wherein said emitting members include light emitting diodes.
32. The implant system of claim 30, wherein said reflectors can reflect at least one of visible light, infrared light, ultraviolet light, or combinations thereof.
33. The implant system of claim 23, further comprising:
an imaging system operable to produce image data of the anatomy.
34. The implant system of claim 33, further comprising:
a display;
wherein the position of the implant inserter, the position of the surgical implant, or combinations thereof can be displayed on the display with the image data.
35. The implant system of claim 34, further comprising:
a bone screw operable to be positioned in the anatomy;
wherein the geometry of the bone screw can be displayed on said display relative to the image data.
36. The implant system of claim 35, wherein the position of the implant, the geometry of the screw, and combinations thereof can be used intra-operably to determine bending of a rod.
37. The implant system of claim 34, wherein the display allows for substantially percutaneous placements of the implant relative to the anatomy.
38. The implant system of claim 23, wherein said reference structure is removably connected to said implant inserter.
39. The implant system of claim 23, further comprising:
an optical tracking system; an acoustic tracking system; an electromagnetic tracking system; a micropulsed radar tracking system; or combinations thereof.
40. An implant system for facilitating percutaneous placement of an implant in an anatomy that can be used with a surgical navigation system to track positions in space, the implant system comprising:
an implant having a head and a body operable to be positioned relative to a selected portion of the anatomy;
an implant inserter operable to be interconnected to said head of said implant; and
a reference structure operable to be interconnected with said implant inserter;
wherein said reference structure is operable with the surgical navigation system to determine a position and produce position data of at least one of said implant inserter, said implant, said reference structure, or combinations thereof;
wherein said implant inserter is operable to move said implant relative to the anatomy.
41. The implant system of claim 40, wherein said implant includes a screw and said body includes a thread operable to engage the anatomy;
wherein said implant inserter is operable to interconnect with at least the head of said screw.
42. The implant system of claim 40, further comprising:
an imaging device that produces image data of the anatomy.
43. The implant system of claim 42, further comprising:
a display;
wherein said display is operable to display the image data of the anatomy.
44. The implant system of claim 43, wherein the position data of said implant is determined by determining a position of the reference's structure relative to the anatomy;
wherein said implant position data is displayed on the display.
45. The implant system of claim 44, wherein said implant position data includes a position of said head.
46. The implant system of claim 42, wherein said head includes a slot.
47. The implant system of claim 46, wherein said implant position data includes a position of said slot.
48. The implant system of claim 44, wherein said position data displayed on the display is determined with a processor.
49. The implant system of claim 40, wherein said implant is operable to be positioned percutaneously relative to the anatomy via said implant inserter;
wherein said implant is operable to be manipulated percutaneously via said implant inserter and said referenced structure.
50. The implant system of claim 49, wherein the position image data of the implant is displayed on a display relative to image data of the anatomy to facilitate percutaneous placement of the implant relative to the anatomy.
51. The implant system of claim 50, wherein positioning of the implants includes positioning a head of a bone screw in a selected orientation relative to the anatomy.
52. The implant system of claim 37, wherein said implant is a screw.
53. The implant system of claim 52, further comprising:
a rod implant;
a rod implant inserter;
a rod inserter reference structure operably interconnected with said rod inserter, wherein said rod inserter reference structure is operable with the surgical navigation system to determine a position of at least a portion of said rod implant;
wherein said implant inserter is operable to position said head relative to the anatomy percutaneously;
wherein said rod inserter is operable to position said rod implant relative to said head that has been positioned with said implant inserter.
US11/199,419 1997-09-24 2005-08-08 Percutaneous registration apparatus and method for use in computer-assisted surgical navigation Abandoned US20050277832A1 (en)

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US10/423,332 USRE39133E1 (en) 1997-09-24 2003-04-24 Percutaneous registration apparatus and method for use in computer-assisted surgical navigation
US11/199,419 US20050277832A1 (en) 1997-09-24 2005-08-08 Percutaneous registration apparatus and method for use in computer-assisted surgical navigation

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US10/423,332 Expired - Lifetime USRE39133E1 (en) 1997-09-24 2003-04-24 Percutaneous registration apparatus and method for use in computer-assisted surgical navigation
US11/199,419 Abandoned US20050277832A1 (en) 1997-09-24 2005-08-08 Percutaneous registration apparatus and method for use in computer-assisted surgical navigation
US11/199,418 Abandoned US20060009780A1 (en) 1997-09-24 2005-08-08 Percutaneous registration apparatus and method for use in computer-assisted surgical navigation
US11/451,595 Expired - Lifetime USRE42226E1 (en) 1997-09-24 2006-06-12 Percutaneous registration apparatus and method for use in computer-assisted surgical navigation
US11/451,594 Expired - Lifetime USRE42194E1 (en) 1997-09-24 2006-06-12 Percutaneous registration apparatus and method for use in computer-assisted surgical navigation
US13/036,939 Expired - Lifetime USRE44305E1 (en) 1997-09-24 2011-02-28 Percutaneous registration apparatus and method for use in computer-assisted surgical navigation
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US11/451,594 Expired - Lifetime USRE42194E1 (en) 1997-09-24 2006-06-12 Percutaneous registration apparatus and method for use in computer-assisted surgical navigation
US13/036,939 Expired - Lifetime USRE44305E1 (en) 1997-09-24 2011-02-28 Percutaneous registration apparatus and method for use in computer-assisted surgical navigation
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USRE42226E1 (en) 2011-03-15
USRE44305E1 (en) 2013-06-18
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