IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
US-0085867
(2011-04-13)
|
등록번호 |
US-8628473
(2014-01-14)
|
발명자
/ 주소 |
- Sliwa, John
- Ma, Zhenyi
- Morse, Stephen
|
출원인 / 주소 |
|
대리인 / 주소 |
|
인용정보 |
피인용 횟수 :
4 인용 특허 :
7 |
초록
▼
An ablation catheter with acoustic monitoring comprises an elongated catheter body; a distal member disposed adjacent a distal end and including an ablation element to ablate a biological member at a target region outside the catheter body; and one or more acoustic transducers each configured to dir
An ablation catheter with acoustic monitoring comprises an elongated catheter body; a distal member disposed adjacent a distal end and including an ablation element to ablate a biological member at a target region outside the catheter body; and one or more acoustic transducers each configured to direct an acoustic beam toward a respective target ablation region and receive reflection echoes therefrom. The distal member includes a transducer housing in which the acoustic transducers are disposed, the transducer housing including at least one transducer window which is the only portion in the distal member through which the acoustic beam passes, at least the at least one transducer window portion of the distal member being made of a material comprising at least 50% carbon by volume, the transducer window material having an acoustic impedance between that of the acoustic transducers and that of the biological member.
대표청구항
▼
1. An ablation catheter with acoustic monitoring, the ablation catheter comprising: an elongated catheter body extending longitudinally between a proximal end and a distal end along a longitudinal axis;a distal member disposed adjacent the distal end, the distal member including an ablation element
1. An ablation catheter with acoustic monitoring, the ablation catheter comprising: an elongated catheter body extending longitudinally between a proximal end and a distal end along a longitudinal axis;a distal member disposed adjacent the distal end, the distal member including an ablation element to ablate a biological member at a target region outside the catheter body; andone or more acoustic transducers each configured to direct an acoustic beam toward a respective target ablation region and receive reflection echoes therefrom;wherein the distal member includes a transducer housing in which the one or more acoustic transducers are disposed, the transducer housing including at least one transducer window through which the acoustic beam passes, the at least one transducer window portion of the distal member being at least 50% carbon by volume, the at least one transducer window being thermally and electrically conductive and having an acoustic impedance between an acoustic impedance of the one or more acoustic transducers and an acoustic impedance of the biological member;wherein the distal member is thermally and electrically conductive and is at least 50% carbon by volume. 2. The ablation catheter of claim 1, wherein the at least one transducer window is at least about 90% carbon by volume. 3. The ablation catheter of claim 2, wherein the at least one transducer window is about 100% carbon by volume. 4. The ablation catheter of claim 1, wherein the at least one transducer window comprises a carbon matrix material which is exterior surface-infused with a noble metal. 5. The ablation catheter of claim 1, wherein the at least one transducer window includes an exterior surface-infused or overlying coating of noble metal. 6. The ablation catheter of claim 1, wherein the at least one transducer window spans 360 degrees around the one or more acoustic transducers. 7. The ablation catheter of claim 1, wherein the distal member comprises a carbon matrix material which is exterior surface-infused with a noble metal. 8. The ablation catheter of claim 1, wherein the distal member is made substantially entirely of carbon. 9. The ablation catheter of claim 8, wherein the distal member comprises a surface coating of noble metal on an exterior surface thereof, and the distal member is more than about 90% by volume carbon. 10. The ablation catheter of claim 1, wherein the at least one transducer window has an acoustic impedance of about 20-30 mega Rayles (kg/m2s). 11. The ablation catheter of claim 1, wherein the at least one transducer window comprises an acoustic lens having a concave external surface. 12. An ablation apparatus having the ablation catheter of claim 1, further comprising: a control unit configured to control the ablation element and the one or more acoustic transducers so that thermal ablation of the biological member and passage of the acoustic beam to and from the biological member occur sequentially and periodically. 13. The ablation apparatus of claim 12, wherein the control unit is configured to control the ablation element and the one or more acoustic transducers so that the thermal ablation of the biological member has a high duty cycle of more than about 90% and the directing of the acoustic beam passage to and from the biological member has a low duty cycle of less than about 10%. 14. The ablation catheter of claim 1, wherein the one or more acoustic transducers include a sideways-directed acoustic transducer oriented in a sideways direction non-parallel to the longitudinal axis to monitor a sideways-formed lesion and a forward-directed acoustic transducer oriented in a forward distal direction parallel to the longitudinal axis to monitor a forward-facing lesion, respectively. 15. The ablation catheter of claim 14, wherein the distal member is rotatable to direct acoustic beam from the sideways-directed acoustic transducer through the at least one transducer window toward a target tissue on a side of the distal member. 16. The ablation catheter of claim 1, wherein a remaining portion of the distal member, other than the at least one transducer window portion, comprises one or more materials selected from the group consisting of metal, ceramic, cermet, and glass. 17. An ablation catheter with acoustic monitoring, the ablation catheter comprising: an elongated catheter body extending longitudinally between a proximal end and a distal end along a longitudinal axis;a distal member disposed adjacent the distal end, the distal member including an ablation element to ablate a biological member at a target region outside the catheter body; andone or more acoustic transducers each configured to direct an acoustic beam toward a respective target ablation region and receive reflection echoes therefromwherein the distal member includes a transducer housing in which the one or more acoustic transducers are disposed, the distal member being at least 50% carbon by volume, the distal member being thermally and electrically conductive and having an acoustic impedance between an acoustic impedance of the one or more acoustic transducers and an acoustic impedance of the biological member. 18. The ablation catheter of claim 17, wherein the distal member is at least about 90% carbon by volume. 19. The ablation catheter of claim 17, wherein the distal member is about 100% carbon by volume. 20. The ablation catheter of claim 17, wherein the distal member has a surface-infused or overlying coating of noble metal on an exterior surface thereof. 21. The ablation catheter of claim 17, wherein the distal member has an acoustic impedance of about 20-30 mega Rayles (kg/m2s). 22. An acoustic monitoring method for an ablation procedure using an ablation catheter which includes an elongated catheter body extending longitudinally between a proximal end and a distal end along a longitudinal axis; a distal member disposed adjacent the distal end, the distal member including an ablation element to ablate a biological member at a target region outside the catheter body; and at least one acoustic transducer, the distal member including a transducer housing in which the at least one acoustic transducer is disposed, the transducer housing including at least one transducer acoustic window each corresponding to the respective at least one acoustic transducer and through which respective acoustic beam from the respective at least one acoustic transducer passes, the at least one transducer window being at least 50% carbon by volume, the at least one transducer window being thermally and electrically conductive and having an acoustic impedance between an acoustic impedance of the at least one acoustic transducer and an acoustic impedance of the biological member, the distal member being thermally and electrically conductive and at least 50% carbon by volume; the method comprising: thermally ablating the biological member at the target region with the ablation element; anddirecting an acoustic beam through the acoustic window to and from the biological member. 23. The acoustic monitoring method of claim 22, wherein directing the acoustic beam to and from the biological member comprises at least one of acoustic lesion feedback of the biological member being ablated, a tissue thickness measurement in a region of the biological member being ablated, a tissue proximity measurement in a region of the biological member being ablated, a pre-pop warning of the biological member being ablated, a pre-pop detection of the biological member being ablated, or sensing of a tissue contact force on the distal member. 24. The acoustic monitoring method of claim 22, wherein the thermally ablating the biological member and the directing the acoustic beam to and from the biological member occur sequentially and periodically. 25. The acoustic monitoring method of claim 24, wherein the thermally ablating of the biological member has a high duty cycle of more than about 90% and the directing of the acoustic beam to and from the biological member has a low duty cycle of less than about 10%.
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