Apparatus and method for an ultrasonic medical device with variable frequency drive

• US 20060116610A1
• Filed: 11/30/2004
• Published: 06/01/2006
• Est. Priority Date: 11/30/2004
• Status: Abandoned Application

• Current Assignee: Cybersonics, Inc
• Original Assignee: OmniSonics Medical Technologies, Inc.
• Inventors: O'Leary, Anthony W., Robertson, Roy M., Hare, Bradley A., Jarger, Kyle K., Murphy, Thomas A., Vadala, Charles J. Jr.
• Application Number:
  US10/999,539
• Publication Number:
  US 20060116610A1
• Time in Patent Office: Days
• US Class Current: 601/2
• CPC Class Codes: A61B 17/22012 in direct contact with, or very close to, the obstruction or concrement for removing obstructions in blood vessels by laser A61B18/245
• CPC Class Codes: A61B 2017/22014 the ultrasound transducer being outside patient's body; with an ultrasound transmission member; with a wave guide; with a vibrated guide wire not applied in A61B17/22012
• CPC Class Codes: A61B 2017/320098 with transverse or torsional motion

Abstract

An apparatus and method for an ultrasonic medical device with a variable frequency drive for ablating a biological material comprises an ultrasonic probe having a proximal end, a distal end and a longitudinal axis therebetween; a transducer that drives the ultrasonic probe over a variable frequency range, creating a transverse ultrasonic vibration along at least a portion of the longitudinal axis of the ultrasonic probe; a coupling engaging the proximal end of the ultrasonic probe to a distal end of the transducer; and an ultrasonic energy source engaged to the transducer that produces an ultrasonic energy, wherein driving the ultrasonic probe over the variable frequency range allows for the ultrasonic energy to propagate around a bend of the ultrasonic probe to ablate the biological material in communication with the ultrasonic probe.

Claims

1. An ultrasonic medical device for ablating a biological material comprising:

an ultrasonic probe having a proximal end, a distal end and a longitudinal axis therebetween;

a transducer that drives the ultrasonic probe over a variable frequency range, creating a transverse ultrasonic vibration along at least a portion of the longitudinal axis of the ultrasonic probe;

a coupling engaging the proximal end of the ultrasonic probe to a distal end of the transducer; and

an ultrasonic energy source engaged to the transducer that produces an ultrasonic energy,

wherein driving the ultrasonic probe over the variable frequency range allows for the ultrasonic energy to propagate around a bend of the ultrasonic probe to ablate the biological material in communication with the ultrasonic probe.

2. The ultrasonic medical device of claim 1 wherein the ultrasonic probe comprises a material that allows the ultrasonic probe to be bent, deflected and flexed.

3. The ultrasonic medical device of claim 1 wherein the transducer obtains a broadband signal to drive the ultrasonic probe and produce power over a broad range of frequencies.

4. The ultrasonic medical device of claim 1 wherein the transducer operates at frequencies away from the resonant frequencies of the ultrasonic probe.

5. The ultrasonic medical device of claim 1 wherein a plurality of transverse resonances of the ultrasonic probe are excited.

6. The ultrasonic medical device of claim 1 wherein a longitudinal resonance of the ultrasonic probe is avoided.

7. The ultrasonic medical device of claim 1 wherein the transducer allows for uniform power output over the variable frequency range.

8. The ultrasonic medical device of claim 1 wherein the transducer is a magnetostrictive mechanism.

9. The ultrasonic medical device of claim 1 wherein the transducer is a voicecoil mechanism.

10. The ultrasonic medical device of claim 1 wherein the transducer is a pneumatic mechanism.

11. The ultrasonic medical device of claim 1 wherein the ultrasonic energy source is a broadband ultrasonic energy source.

12. The ultrasonic medical device of claim 1 wherein the transverse ultrasonic vibration generates a plurality of transverse nodes and a plurality of transverse anti-nodes along at least a portion of the longitudinal axis of the ultrasonic probe, creating cavitation in a medium surrounding the ultrasonic probe to ablate the biological material.

13. The ultrasonic medical device of claim 1 wherein the ultrasonic probe is driven in an open loop configuration over the variable frequency range.

14. The ultrasonic medical device of claim 1 wherein the ultrasonic probe is driven in a closed loop configuration over the variable frequency range.

15. The ultrasonic medical device of claim 1 wherein the transducer drives the ultrasonic probe over the variable frequency range causing a longitudinal ultrasonic vibration along at least a portion of the longitudinal axis of the ultrasonic probe.

16. The ultrasonic medical device of claim 1 wherein the transducer drives the ultrasonic probe over the variable frequency range causing a torsional ultrasonic vibration along at least a portion of the longitudinal axis of the ultrasonic probe.

17. The ultrasonic medical device of claim 1 wherein the ultrasonic probe is disposable.

18. The ultrasonic medical device of claim 1 wherein the ultrasonic probe contains a super-elastic alloy.

19. An ultrasonic medical device for resolving a biological material comprising:

an ultrasonic probe having a proximal end, a distal end terminating in a probe tip and a longitudinal axis between the proximal end and the distal end;

a transducer that converts electrical energy into mechanical energy, creating a transverse ultrasonic vibration along the longitudinal axis of the ultrasonic probe;

a coupling engaging the proximal end of the ultrasonic probe to a distal end of the transducer,

wherein the ultrasonic probe is driven over a variable frequency range with an approximately uniform power output to ablate the biological material.

20. The ultrasonic medical device of claim 19 wherein the ultrasonic medical device allows an ultrasonic energy to propagate around a bend of the ultrasonic probe.

21. The ultrasonic medical device of claim 19 wherein the transverse ultrasonic vibration produces a plurality of transverse nodes and a plurality of transverse anti-nodes along a portion of the longitudinal axis of the ultrasonic probe.

22. The ultrasonic medical device of claim 19 wherein the transverse ultrasonic vibration creates cavitation in a medium surrounding the ultrasonic probe.

23. The ultrasonic medical device of claim 19 wherein the transducer obtains a broadband signal to drive the ultrasonic probe and produce power over a broad range of frequencies.

24. The ultrasonic medical device of claim 19 further comprising an ultrasonic energy source engaged to the transducer that produces an ultrasonic energy.

25. The ultrasonic medical device of claim 19 wherein a plurality of transverse resonances of the ultrasonic probe are excited.

26. The ultrasonic medical device of claim 19 wherein a longitudinal resonance of the ultrasonic probe is avoided.

27. The ultrasonic medical device of claim 19 wherein the ultrasonic probe is driven in an open loop configuration over the variable frequency range.

28. The ultrasonic medical device of claim 19 wherein the ultrasonic probe is driven in a closed loop configuration over the variable frequency range.

29. The ultrasonic medical device of claim 19 wherein the transducer drives the ultrasonic probe over the variable frequency range causing a longitudinal ultrasonic vibration along at least a portion of the longitudinal axis of the ultrasonic probe.

30. The ultrasonic medical device of claim 19 wherein the transducer drives the ultrasonic probe over the variable frequency range causing a torsional ultrasonic vibration along at least a portion of the longitudinal axis of the ultrasonic probe.

31. The ultrasonic medical device of claim 19 wherein the ultrasonic probe contains a super-elastic alloy.

32. The ultrasonic medical device of claim 19 wherein the ultrasonic probe is for a single use on a single patient.

33. A method of propagating an ultrasonic energy along a bend of an ultrasonic medical device to ablate a biological material comprising:

providing the ultrasonic medical device comprising an ultrasonic probe having a proximal end, a distal end and a longitudinal axis therebetween;

inserting the ultrasonic probe in a vasculature of a body;

flexing the ultrasonic probe along a bend of the vasculature;

moving the ultrasonic probe adjacent to the biological material;

activating an ultrasonic energy source engaged to the ultrasonic probe to generate a transverse ultrasonic vibration along at least a portion of the longitudinal axis of the ultrasonic probe; and

driving the ultrasonic probe over a variable frequency range to allow the ultrasonic energy to propagate along a bend of the ultrasonic probe to ablate the biological material.

34. The method of claim 33 further comprising creating a plurality of transverse nodes and a plurality of transverse anti-nodes along a portion of the longitudinal axis of the ultrasonic probe.

35. The method of claim 33 further comprising producing a uniform power output over the variable frequency range.

36. The method of claim 33 further comprising generating acoustic energy in a medium surrounding the ultrasonic probe through the transverse ultrasonic vibration of the ultrasonic probe.

37. The method of claim 33 further comprising providing a transducer of the ultrasonic medical device that drives the ultrasonic probe over the variable frequency range.

38. The method of claim 33 further comprising exciting one or more transverse resonances of the ultrasonic probe.

39. The method of claim 33 further comprising avoiding a longitudinal resonance of the ultrasonic probe.

40. The method of claim 33 further comprising providing a transducer that is a magnetostrictive mechanism.

41. The method of claim 33 further comprising providing a transducer that is a voicecoil mechanism.

42. The method of claim 33 further comprising providing a transducer that is a pneumatic mechanism.

43. The method of claim 33 further comprising driving the ultrasonic probe over a variable frequency range in an open loop configuration.

44. The method of claim 33 further comprising driving the ultrasonic probe over a variable frequency range in a closed loop configuration.

45. The method of claim 33 further comprising propagating a longitudinal ultrasonic vibration long at least a portion of the longitudinal axis of the ultrasonic probe.

46. The method of claim 33 further comprising propagating a torsional ultrasonic vibration long at least a portion of the longitudinal axis of the ultrasonic probe.

47. The method of claim 33 further comprising providing the ultrasonic probe having a flexibility allowing the ultrasonic probe to be deflected and articulated.

48. The method of claim 33 wherein the ultrasonic probe contains a super-elastic alloy.

49. A method of ablating a biological material adjacent to a bend in a vasculature of a body comprising:

providing an ultrasonic medical device comprising an ultrasonic probe having a proximal end, a distal end terminating in a probe tip and a longitudinal axis between the proximal end and the distal end;

inserting the ultrasonic probe in an insertion point of the vasculature;

moving the ultrasonic probe along the bend in the vasculature;

placing the ultrasonic probe in communication with the biological material;

activating an ultrasonic energy source engaged to the ultrasonic probe to produce an electric signal that drives a transducer of the ultrasonic medical device to produce a transverse ultrasonic vibration of the ultrasonic probe;

driving the ultrasonic probe over a variable frequency range to maintain a biological material destroying effect along a bend of the ultrasonic probe.

50. The method of claim 49 further comprising creating a plurality of transverse nodes and a plurality of transverse anti-nodes along a portion of the longitudinal axis of the ultrasonic probe.

51. The method of claim 49 further comprising exciting one or more transverse resonances of the ultrasonic probe.

52. The method of claim 49 further comprising driving the ultrasonic probe over a variable frequency range in an open loop configuration.

53. The method of claim 49 further comprising driving the ultrasonic probe over a variable frequency range in a closed loop configuration.

54. The method of claim 49 further comprising providing a transducer of the ultrasonic medical device that drives the ultrasonic probe over the variable frequency range.

55. The method of claim 49 further comprising propagating a longitudinal ultrasonic vibration long at least a portion of the longitudinal axis of the ultrasonic probe.

56. The method of claim 49 further comprising propagating a torsional ultrasonic vibration long at least a portion of the longitudinal axis of the ultrasonic probe.

57. The method of claim 49 wherein the ultrasonic probe contains a super-elastic alloy.