Catheter with thin film pressure sensing distal tip
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
A61B-005/04
A61B-018/14
출원번호
US-0857342
(2010-08-16)
등록번호
US-8380276
(2013-02-19)
발명자
/ 주소
Schultz, Jeffrey W.
출원인 / 주소
Biosense Webster, Inc.
인용정보
피인용 횟수 :
9인용 특허 :
75
초록▼
A mapping and ablation catheter has contact force sensing capabilities at a distal end. In one embodiment, the catheter includes a catheter body, a deflectable section, and a tip distal tip section which has a tip electrode with a thin-film pressure sensor that is adapted to detect a force vector ap
A mapping and ablation catheter has contact force sensing capabilities at a distal end. In one embodiment, the catheter includes a catheter body, a deflectable section, and a tip distal tip section which has a tip electrode with a thin-film pressure sensor that is adapted to detect a force vector applied to the tip electrode. The thin-film pressure sensor includes two opposing flexible and thin support members containing a pressure-sensitive material therebetween whose resistivity changes as a result of pressure and is detected by trace electrode intersections supported on interfacing surfaces of the flexible and thin support members. Used with a stop member having a conforming shape against which the thin-film pressure sensor abuts when a force vector is applied to the tip electrode, the pressure sensor can have a 2-D, radially-symmetrical shape, e.g., a disc or ring configuration, or a 3-D, radially-symmetrical shape, e.g., a conical configuration.
대표청구항▼
1. A catheter adapted for mapping and/or ablation, comprising: a tubing adapted for passage through a vessel in a patient's body;a tip electrode distal the tubing, the tip electrode configured for contact with body tissue for mapping or ablation; anda thin, flexible force sensor distal the tubing, t
1. A catheter adapted for mapping and/or ablation, comprising: a tubing adapted for passage through a vessel in a patient's body;a tip electrode distal the tubing, the tip electrode configured for contact with body tissue for mapping or ablation; anda thin, flexible force sensor distal the tubing, the force sensor having: first and second thin flexible backing sheets;a first flexible electrode and a second flexible electrode, the first flexible electrode attached to and supported by the first thin flexible backing sheet to provide a driven electrode, the second flexible electrode attached to and supported by the second thin flexible backing sheet to provide a sensed electrode; anda resistive layer applied to at least one of the sensed or driven electrodes and made of a resistive material whose resistance changes as a function of the pressure applied thereto. 2. A catheter of claim 1, wherein the first flexible electrode and the second flexible electrode comprise at least two pairs of first flexible electrodes and second flexible electrodes, wherein the first flexible electrodes are attached to and supported by the first thin flexible backing sheet to provide at least two driven electrodes, and the second flexible electrodes are attached to and supported by the second thin flexible backing sheet to provide at least two sensed electrodes, and wherein the resistive layer is applied to at least one of the sensed electrodes or the driven electrodes. 3. A catheter of claim 2, wherein the at least two pairs of first flexible electrodes and second flexible electrodes form at least four crossings, each crossing being between one of the first flexible electrodes and one of the second flexible electrodes. 4. A catheter of claim 1, further comprising a stop member positioned between the tubing and the force sensor, the stop member being more rigid than the tubing for providing a normal force against the force sensor in response to a force applied to the tip electrode. 5. A catheter of claim 1, further comprising a stop member positioned between the tubing and the force sensor, wherein a distal end of the stop member and a proximal end of the tip electrode have a conforming configuration such that the force sensor is nested therebetween. 6. A catheter of claim 5, wherein the conforming configuration includes a generally conical shape. 7. A catheter of claim 6, wherein each of the distal end of the stop member, the proximal end of the tip electrode, and the force sensor has a generally conical shape. 8. A catheter of claim 7, wherein the distal end of the stop member has a generally concave conical shape and the proximal end of the tip electrode has a generally convex conical shape. 9. A catheter of claim 1, wherein the force sensor is disc-shaped and positioned between the tubing and the tip electrode. 10. A catheter of claim 9, wherein the force sensor has an outer diameter and an inner diameter defining a hole. 11. A catheter of claim 1, wherein the tubing has a single central lumen. 12. A catheter of claim 1, wherein the tubing supports a catheter body. 13. A catheter of claim 1, wherein the tubing is multi-lumen. 14. A catheter of claim 1, wherein the tubing supports a deflectable portion. 15. A catheter adapted for mapping and/or ablation, comprising: a tubing adapted for passage through a vessel in a patient's body;a tip electrode distal the tubing, the tip electrode configured for contact with body tissue for mapping or ablation; anda thin, flexible force sensor distal the tubing, the force sensor having first and second thin flexible backing sheets;a plurality of electrodes between the first and second backing sheets, the electrodes arranged to form a plurality of crossings with different pairs of the plurality of electrodes, each electrode being attached to and supported by at least one of the first or second flexible backing sheets, wherein for each pair of electrodes for each crossing one electrode is driven while the other electrode is sensed; anda resistive layer applied to at least one of the sensed or driven electrodes and made of a resistive material whose resistance changes as a function of the pressure applied thereto. 16. A catheter of claim 15, further comprising a stop member, wherein the force sensor is positioned between the stop member and the tip electrode. 17. A catheter of claim 16, wherein an adjacent end of the stop member and an adjacent end of the tip electrode have a conforming 3-D shape such that the force sensor is nested therebetween. 18. A catheter of claim 15, wherein the force sensor has a three-dimensional shape such that it is responsive to a force vector applied to the tip electrode with axial and radial components. 19. A catheter of claim 15, wherein the force sensor is responsive to a force vector applied to the tip electrode with axial and radial components. 20. A catheter of claim 15, wherein the force sensor has at least three crossings.
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이 특허에 인용된 특허 (75)
Vanney,Guy, Ablation fluid manifold for ablation catheter.
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