Vibration sensitive ablation device and method

• US 20010039419A1
• Filed: 04/26/2001
• Published: 11/08/2001
• Est. Priority Date: 04/27/2000
• Status: Abandoned Application

• Current Assignee: Medtronic Incorporated (Medtronic Plc)
• Original Assignee: Medtronic Incorporated (Medtronic Plc)
• Inventors: Keogh, James R., Jahns, Scott E., Francischelli, David E.
• Application Number:
  US09/844,221
• Publication Number:
  US 20010039419A1
• Time in Patent Office: Days
• US Class Current: 606/42
• CPC Class Codes: A61B 18/14 Probes or electrodes therefor
• CPC Class Codes: A61B 18/1402 Probes for open surgery
• CPC Class Codes: A61B 18/1442 Probes having pivoting end effectors, e.g. forceps
• CPC Class Codes: A61B 18/1445 at the distal end of a shaft, e.g. forceps or scissors at the end of a rigid rod
• CPC Class Codes: A61B 2017/00022 Sensing or detecting at the treatment site
• CPC Class Codes: A61B 2017/00084 Temperature
• CPC Class Codes: A61B 2017/00115 with audible or visual output with imaging means A61B90/37, A61B34/20
• CPC Class Codes: A61B 2017/00128 related to intensity or progress of surgical action
• CPC Class Codes: A61B 2017/00243 cardiac
• CPC Class Codes: A61B 2017/00247 Making holes in the wall of the heart, e.g. laser Myocardial revascularization
• CPC Class Codes: A61B 2017/003 Steerable
• CPC Class Codes: A61B 2017/0243 for immobilizing local areas of the heart, e.g. while it beats trocars attached to inner organs or inner body tissue A61B2017/3488
• CPC Class Codes: A61B 2017/306 holding by means of suction
• CPC Class Codes: A61B 2018/00011 with fluids
• CPC Class Codes: A61B 2018/00107 Coatings on the energy applicator
• CPC Class Codes: A61B 2018/0016 Energy applicators arranged in a two- or three dimensional array
• CPC Class Codes: A61B 2018/00291 using suction
• CPC Class Codes: A61B 2018/00351 Heart
• CPC Class Codes: A61B 2018/00392 Transmyocardial revascularisation
• CPC Class Codes: A61B 2018/00577 Ablation
• CPC Class Codes: A61B 2018/00666 : using a threshold value
• CPC Class Codes: A61B 2018/00672 : lower
• CPC Class Codes: A61B 2018/00702 : Power or energy
• CPC Class Codes: A61B 2018/00708 : switching the power on or off
• CPC Class Codes: A61B 2018/00791 : Temperature
• CPC Class Codes: A61B 2018/00797 : measured by multiple temperature sensors
• CPC Class Codes: A61B 2018/00815 : measured by a thermistor
• CPC Class Codes: A61B 2018/00821 : measured by a thermocouple
• CPC Class Codes: A61B 2018/0088 : Vibration
• CPC Class Codes: A61B 2018/1253 : monopolar
• CPC Class Codes: A61B 2018/126 : bipolar
• CPC Class Codes: A61B 2018/146 : Scissors
• CPC Class Codes: A61B 2018/1472 : for use with liquid electrolyte, e.g. virtual electrodes
• CPC Class Codes: A61B 2218/002 : Irrigation

Abstract

An ablation apparatus including a maneuvering mechanism, a conductive element attached to the apparatus, a sensor attached to the apparatus and an output device in communication with the sensor is provided. The sensor senses vibration during the ablation procedure and sends a signal to the output device to reduce power to the conductive element.

Claims

1. An ablation apparatus comprising:

a maneuvering mechanism;

a conductive element attached to the maneuvering mechanism;

a sensor attached to the maneuvering mechanism and operatively adapted to sense vibration during an ablation procedure; and

an output device in communication with the sensor and operatively adapted to respond to a signal from the sensor, wherein the signal corresponds to a sensed vibration.

2. The apparatus of

claim 1

wherein the sensed vibration comprises the excitation of water molecules.

3. The apparatus of

claim 1

wherein the sensed vibration comprises vibration of the conductive element.

4. The apparatus of

claim 3

wherein the vibration of the conductive element corresponds to a vibration within the tissue.

5. The apparatus of

claim 1

wherein the output device comprises a switch operatively adapted to turn off power to the conductive element when the vibration has reached a given value.

6. The apparatus of

claim 1

wherein the output device is adapted to reduce power to the conductive element when the vibration exceeds a predetermined value.

7. The apparatus of

claim 1

further comprising:

a power source in communication with the conductive element, wherein the output device gives a visual signal to a user to control the power source.

8. The apparatus of

claim 1

further comprising:

a power source in communication with the conductive element, wherein the output device gives an audible signal to a user to control the power source.

9. The apparatus of

claim 1

wherein the sensor is integrated with the conductive element.

10. The apparatus of

claim 1

wherein the sensor comprises a microphone.

11. The apparatus of

claim 1

wherein the sensor comprises a piezoelectric crystal.

12. The apparatus of

claim 1

further comprising:

a fluid supply in communication with the apparatus, wherein the output device includes a switch operatively adapted to turn off the supply when the vibration has reached a given value.

13. The apparatus of

claim 1

further comprising:

a fluid supply in communication with the apparatus, wherein the output device gives an indication to the user to control the fluid supply.

14. The apparatus of

claim 1

wherein the maneuvering mechanism is a hemostat-like tool.

15. The apparatus of

claim 1

wherein the maneuvering mechanism is a catheter.

16. An apparatus for ablating organic tissue, comprising:

a maneuvering mechanism;

a conductive element disposed adjacent a face of the maneuvering mechanism;

a sensor adjacent the conductive element; and

an output device in communication with the conductive element, wherein the sensor is operatively adapted to sense vibration caused by an ablation procedure and send a signal to the output device to reduce power to the conductive element.

17. The apparatus of

claim 16

wherein the sensor is a piezoelectric crystal.

18. The apparatus of

claim 16

wherein the sensor is a piezoelectric polymer.

19. The apparatus of

claim 16

wherein the sensor is a mechanical sensor.

20. The apparatus of

claim 16

wherein the sensor is integrated with the conductive element.

21. The apparatus of

claim 16

wherein the output device is a switch operatively adapted to turn off a power source when the vibration has reached a given value.

22. The apparatus of

claim 16

wherein the output device gives a signal to a user to control a power source operatively connected to the conductive element.

23. The apparatus of

claim 16

wherein the maneuvering mechanism is a hemostat-like tool.

24. The apparatus of

claim 16

wherein the maneuvering mechanism is a catheter.

25. A method of ablating organic tissue, comprising:

positioning a conductive element adjacent the organic tissue;

supplying power to the conductive element;

sensing with a sensor positioned adjacent the conductive element the vibration of the organic tissue; and

reducing power to the conductive element when the vibration reaches a given value.

26. The method of

claim 25

, further comprising:

halting the power when the vibration reaches a given value.

27. The method of

claim 25

, further comprising:

supplying fluid from a fluid supply to the tissue; and

halting the fluid supply when the vibration reaches a given value.

28. The method of

claim 25

further comprising:

sending a signal from the sensor to a switch to reduce the power.

29. The method of

claim 25

, further comprising:

providing output from an output device when the vibration reaches a given value.

30. The method of

claim 29

further comprising:

sending a signal from the sensor to the output device; and

sending an indicator signal from the output device.

31. The method of

claim 25

wherein the sensor is a piezoelectric crystal.

32. The method of

claim 25

wherein the sensor is a piezoelectric polymer.

33. The method of

claim 25

wherein the sensor is integrated with the conductive element.

34. An ablation system for creating a tissue ablation site, the system comprising:

an energy source;

an ablation apparatus operatively coupled to the energy source, the ablation apparatus having a tissue contact surface and one or more energy transfer elements positioned along the tissue contact surface; and

a sensor device operatively coupled to the energy source and including a sensor adapted to sense a vibration parameter relating to the tissue ablation site, the sensor device comprising means for varying energy supplied by the energy source to the energy transfer elements in response to the sensed vibration parameter.

35. The system of

claim 34

wherein the ablation apparatus further has one or more suction openings positioned along the tissue contact surface and a suction conduit for providing suction from a suction source to the one or more suction openings, the suction conduit operatively connected with the one or more suction openings.

36. The system of

claim 34

wherein the sensor device further has a tissue contact surface, one or more suction openings positioned along the tissue contact surface and a suction conduit for providing suction from a suction source to the one or more suction openings, the suction conduit operatively connected with the one or more suction openings.

37. The system of

claim 34

wherein the ablation apparatus further comprises an irrigation fluid conduit for providing irrigation fluid from an irrigation source to the tissue ablation site.

38. The system of

claim 37

wherein the irrigation fluid is an energy-conducting liquid.

39. The system of

claim 37

wherein the irrigation fluid comprises one or more diagnostic or therapeutic agents.

40. The system of

claim 37

wherein the sensor further comprises a means for varying irrigation fluid supplied to the irrigation conduit in response to the sensed vibration parameter.

41. The system of

claim 34

wherein the ablation apparatus further comprises a maneuvering apparatus operatively connected with the tissue contact surface for maneuvering the energy transfer elements.

42. The system of

claim 41

wherein the maneuvering apparatus includes at least one pull wire.

43. The system of

claim 41

wherein the maneuvering apparatus includes a handle.

44. The system of

claim 43

wherein the handle comprises one or more hinges or joints.

45. The system of

claim 44

wherein the one or more hinges or joints are actuated remotely.

46. The system of

claim 43

wherein the handle is shapeable.

47. The system of

claim 34

wherein the sensor device further comprises a maneuvering apparatus operatively connected with the sensor for maneuvering the sensor.

48. The system of

claim 47

wherein the maneuvering apparatus includes at least one pull wire.

49. The system of

claim 47

wherein the maneuvering apparatus includes a handle.

50. The system of

claim 49

wherein the handle comprises one or more hinges or joints.

51. The system of

claim 50

wherein the one or more hinges or joints are actuated remotely.

52. The system of

claim 49

wherein the handle is shapeable.

53. The system of

claim 34

wherein the sensor device further comprises an output device for alerting or informing a practitioner regarding the vibration parameter relating to the tissue ablation site sensed by the sensor device.

54. The system of

claim 34

further comprising a generator operatively connected to the energy source.

55. The system of

claim 54

wherein the generator includes a control unit or processor.

56. The system of

claim 34

wherein the energy source is an RF energy source.

57. The system of

claim 34

wherein the energy source is an electrical energy source.

58. The system of

claim 34

wherein the energy source is a laser energy source.

59. The system of

claim 34

wherein the energy source is a thermal energy source.

60. The system of

claim 34

wherein the energy source is a microwave energy source.

61. The system of

claim 34

wherein the energy source is an ultrasound energy source.