CA2468531A1 - Radio-frequency-based catheter system with improved deflection and steering mechanisms - Google Patents

Radio-frequency-based catheter system with improved deflection and steering mechanisms Download PDF

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Publication number
CA2468531A1
CA2468531A1 CA002468531A CA2468531A CA2468531A1 CA 2468531 A1 CA2468531 A1 CA 2468531A1 CA 002468531 A CA002468531 A CA 002468531A CA 2468531 A CA2468531 A CA 2468531A CA 2468531 A1 CA2468531 A1 CA 2468531A1
Authority
CA
Canada
Prior art keywords
radio
curvilinear
flexible
frequency antenna
configuration
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
CA002468531A
Other languages
French (fr)
Other versions
CA2468531C (en
Inventor
Theodore C. Ormsby
Ming-Fan Law
George L. Leung
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
MedWaves Inc
Original Assignee
Individual
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Publication of CA2468531A1 publication Critical patent/CA2468531A1/en
Application granted granted Critical
Publication of CA2468531C publication Critical patent/CA2468531C/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/42—Housings not intimately mechanically associated with radiating elements, e.g. radome
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B18/00—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body
    • A61B18/04—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body by heating
    • A61B18/12—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body by heating by passing a current through the tissue to be heated, e.g. high-frequency current
    • A61B18/14—Probes or electrodes therefor
    • A61B18/1492—Probes or electrodes therefor having a flexible, catheter-like structure, e.g. for heart ablation
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
    • A61B17/00234—Surgical instruments, devices or methods, e.g. tourniquets for minimally invasive surgery
    • A61B2017/00292—Surgical instruments, devices or methods, e.g. tourniquets for minimally invasive surgery mounted on or guided by flexible, e.g. catheter-like, means
    • A61B2017/003—Steerable
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
    • A61B2017/00831—Material properties
    • A61B2017/00867—Material properties shape memory effect
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B18/00—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body
    • A61B2018/00315—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body for treatment of particular body parts
    • A61B2018/00345—Vascular system
    • A61B2018/00351—Heart
    • A61B2018/00357—Endocardium
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B18/00—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body
    • A61B2018/00636—Sensing and controlling the application of energy
    • A61B2018/00773—Sensed parameters
    • A61B2018/00839—Bioelectrical parameters, e.g. ECG, EEG
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L2201/00—Properties
    • C08L2201/12—Shape memory

Abstract

A shapeable curvilinear radio-frequency antenna apparatus (110) for ablating biological tissue within the body vessel of a patient includes a flexible catheter body (120) having a distal portion (140) and an elongated lumen (150). Inner and outer coaxially aligned conductors (640, 660) extend within the catheter (120) and are coaxial with the lumen (150). A flexible shapeable curvilinear radio-frequency antenna (250) is carried by the distal portion of the flexible catheter body (120) and is in electrical communication with the inner and outer coaxially aligned conductors (640, 660). The flexible shapeable curvilinear radio-frequency antenna (250) is adaptable to receive and transmit radio-frequency energy for ablating biological tissue and is shapeable between a straight configuration (190) and a curvilinear configuration (180) for creating a curvilinear ablation pattern in biological tissue within the body vessel of a patient.

Claims (27)

1. A shapeable curvilinear radio-frequency antenna apparatus for ablating biological tissue within the body vessel of a patient, comprising:
a) a flexible catheter body including a distal portion and an elongated lumen;
b) inner and outer coaxially aligned conductors extending within the catheter and coaxial with the lumen; and c) a flexible shapeable curvilinear radio-frequency antenna carried by the distal portion of the flexible catheter body and in electrical communication with the inner and outer coaxially aligned conductors, the flexible shapeable curvilinear radio-frequency antenna adaptable to receive and transmit radio-frequency energy for ablating biological tissue and shapeable between a straight configuration and a curvilinear configuration for creating a curvilinear ablation pattern in biological tissue within the body vessel of a patient.
2. The antenna apparatus of claim 1, further including a pre-shaped deflection member carried by the flexible shapeable curvilinear radio-frequency antenna adaptable to take a pre-shaped memory configuration, and a deflection regulating member operatively associated with the pre-shaped deflection member for regulating the deflection of said pre-shaped deflection member, wherein at least one of the pre-shaped deflection member and the deflection regulating member controllable for changing the configuration of the flexible shapeable curvilinear radio-frequency antenna between a straight configuration and a pre-shaped memory curvilinear configuration.
3. The antenna apparatus of claim 2, wherein the pre-shaped deflection member is an elongated, flexible spine made of a shape-memory alloy and longitudinally disposed in the elongated lumen.
4. The antenna apparatus of claims 1 or 2, wherein the deflection regulating member is an elongated, rigid member longitudinally adjacent to the pre-shaped deflection member in the elongated lumen.
5. The antenna apparatus of any of claims 2-4, wherein at least one of the pre-shaped deflection member and the deflection regulating member is movable for changing the configuration of the flexible curvilinear radio-frequency antenna between a straight configuration and a pre-shaped memory curvilinear configuration.
6. The antenna apparatus of claim 2, further including a fluid pressure source and the deflection regulating member is fluid pressure within the elongated lumen from the fluid pressure source.
7. The antenna apparatus of any of claims 1-6, further including a deflectable catheter guide disposed within the elongated lumen and terminating distally of a distal end of the catheter to define a biological ablation pathway.
8. The antenna apparatus of claim 7, wherein the distal portion of the deflectable catheter guide includes an atraumatic tip.
9. The antenna apparatus of claims 7 or 8, wherein the deflectable catheter guide extends distally from the distal opening to define a guide leader.
10. The antenna apparatus of claim 9, wherein the guide leader has a manually adjustable length.
11. The antenna apparatus of claim 9, wherein the guide leader has a predetermined fixed length.
12. The antenna apparatus of any of claims 7-11, wherein the deflectable catheter guide has variable stiffness along at least part of its length.
13. The antenna apparatus of any of claims 7-12, wherein the deflectable catheter guide further comprises a pull wire tendon slidably disposed within the catheter lumen for deflecting the catheter guide.
14. The antenna apparatus of any of claims 1-13, wherein the radio-frequency antenna is adaptable to receive and transmit microwave energy at a frequency greater than 300 Megahertz.
15.A method of ablating biological tissue within the body vessel of a patient, comprising the steps of:
a) providing a shapeable curvilinear radio-frequency antenna apparatus for ablating biological tissue within the body vessel of a patient, the shapeable curvilinear radio-frequency antenna apparatus including a flexible catheter body including a distal portion and an elongated lumen, inner and outer coaxially aligned conductors extending within the catheter and coaxial with the lumen;
and a flexible shapeable curvilinear radio-frequency antenna carried by the distal portion of the flexible catheter body and in electrical communication with the inner and outer coaxially aligned conductors, the flexible shapeable curvilinear radio-frequency antenna adaptable to receive and transmit radio-frequency energy for ablating biological tissue and shapeable between a straight configuration and a curvilinear configuration for creating a curvilinear ablation pattern in biological tissue within the body vessel of a patient;
b) delivering the shapeable curvilinear radio-frequency antenna apparatus to a targeted body tissue ablation site within the body vessel of a patient;
c) changing the configuration of the flexible curvilinear radio-frequency antenna from a straight configuration to a pre-shaped memory curvilinear configuration so that the flexible curvilinear radio-frequency antenna is adjacent to the body tissue to be ablated; and d) ablating the body tissue using the flexible shapeable curvilinear radio-frequency antenna.
16. The method of claim 15, wherein the shapeable curvilinear radio-frequency antenna apparatus further includes a pre-shaped deflection member carried by the flexible curvilinear radio-frequency antenna adaptable to take a pre-shaped curvilinear memory configuration, a deflection regulating member operatively associated with the pre-shaped deflection member for regulating the deflection of said pre-shaped deflection member, and changing the configuration of the flexible curvilinear radio-frequency antenna includes controlling at least one of the pre-shaped deflection member and the deflection regulating member to change the configuration of the flexible curvilinear radio-frequency antenna from a straight configuration to a pre-shaped memory curvilinear configuration so that the flexible curvilinear radio-frequency antenna is adjacent to the body tissue to be ablated.
17. The method of claim 16, wherein the pre-shaped deflection member is an elongated, flexible spine made of a shape-memory alloy and longitudinally disposed in the elongated lumen.
18. The method of claims 16 or 17, wherein the deflection regulating member is an elongated, rigid member longitudinally adjacent to the pre-shaped deflection member in the elongated lumen.
19. The method of any of claims 16-18, wherein controlling at least one of the pre-shaped deflection member and the deflection regulating member includes moving at least one of the pre-shaped deflection member and the deflection regulating member for changing the configuration of the flexible curvilinear radio-frequency antenna from a straight configuration to a pre-shaped memory configuration.
20. The method of claims 16 or 17, further including a fluid pressure source and the deflection regulating member is fluid pressure within the elongated lumen from the fluid pressure source, and controlling at least one of the pre-shaped deflection member and the deflection regulating member includes supplying the elongated lumen with fluid pressure from the fluid pressure source to change the configuration of the flexible curvilinear radio-frequency antenna from a straight configuration to a pre-shaped memory configuration.
21. The method of any of claims 16-20, wherein the shapeable curvilinear radio-frequency antenna apparatus includes a deflectable catheter guide disposed within the elongated lumen, the catheter guide including a distal end; and the method further including positioning the radio-frequency antenna of the catheter adjacent to the body tissue to be ablated by anchoring the distal end of the catheter guide in the body vessel and deflecting the catheter guide so that the radio-frequency antenna of the catheter is adjacent to the body tissue to be ablated.
22. The method of claim 21, wherein the distal portion of the deflectable catheter guide includes an atraumatic tip, and anchoring the distal end of the catheter guide in the body vessel includes anchoring the atraumatic tip of the catheter guide in the body vessel.
23. The method of claims 21 or 22, wherein the deflectable catheter guide extends distally from an end of the catheter body to define a guide leader, and deflecting the catheter guide includes deflecting at least the guide leader.
24. The method of any of claims 21-23, wherein the deflectable catheter guide further comprises a pull wire tendon slidably disposed within the elongated lumen, and deflecting the catheter guide includes using the pull wire tendon to cause the catheter guide to deflect.
25. The method of any of claims 21-24, wherein the guide leader has a manually adjustable length, and the method further includes manually adjusting the length of the guide leader before deflecting the catheter guide.
26. The method of any of claims 21-24, wherein the guide leader has a predetermined fixed length.
27. The method of any of claims 15-26, wherein the radio-frequency antenna is adaptable to receive and transmit microwave energy at a frequency greater than 300 Megahertz.
CA2468531A 2001-11-29 2002-11-27 Radio-frequency-based catheter system with improved deflection and steering mechanisms Expired - Lifetime CA2468531C (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
US33419901P 2001-11-29 2001-11-29
US60/334,199 2001-11-29
PCT/US2002/037886 WO2003047448A1 (en) 2001-11-29 2002-11-27 Radio-frequency-based catheter system with improved deflection and steering mechanisms

Publications (2)

Publication Number Publication Date
CA2468531A1 true CA2468531A1 (en) 2003-06-12
CA2468531C CA2468531C (en) 2010-06-01

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Family Applications (1)

Application Number Title Priority Date Filing Date
CA2468531A Expired - Lifetime CA2468531C (en) 2001-11-29 2002-11-27 Radio-frequency-based catheter system with improved deflection and steering mechanisms

Country Status (10)

Country Link
US (3) US7004938B2 (en)
EP (1) EP1460954B1 (en)
JP (1) JP2005511135A (en)
CN (1) CN100508910C (en)
AT (1) ATE375127T1 (en)
AU (1) AU2002365882A1 (en)
CA (1) CA2468531C (en)
DE (1) DE60222934T2 (en)
HK (1) HK1073239A1 (en)
WO (1) WO2003047448A1 (en)

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US7004938B2 (en) 2006-02-28
US20060142752A1 (en) 2006-06-29
AU2002365882A1 (en) 2003-06-17
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ATE375127T1 (en) 2007-10-15
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US8152799B2 (en) 2012-04-10
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US7815637B2 (en) 2010-10-19
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JP2005511135A (en) 2005-04-28
CN1625371A (en) 2005-06-08

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