Method and system for ultrasound treatment with a multi-directional transducer

• US 7,393,325 B2
• Filed: 09/16/2004
• Issued: 07/01/2008
• Est. Priority Date: 09/16/2004
• Status: Active Grant

• Current Assignee: Guided Therapy Systems Llc
• Original Assignee: Guided Therapy Systems Llc
• Inventors: Slayton, Michael H., Barthe, Peter G.
• Primary Examiner(s): Casler; Brian L.
• Assistant Examiner(s): Roy; Baisakhi
• Application Number:
  US10/944,499
• Publication Number:
  US 20060058707A1
• Time in Patent Office: 1,384 Days
• Field of Search: 600/437, 600/439, 600/466, 600/444, 600/459, 601 1- 5, 604 20- 22
• US Class Current: 600/439
• CPC Class Codes: A61B 2017/00084 Temperature
• CPC Class Codes: A61B 2090/378 using ultrasound
• CPC Class Codes: A61B 8/4272 involving the acoustic interface between the transducer and the tissue
• CPC Class Codes: A61N 2007/0078 with multiple treatment transducers
• CPC Class Codes: A61N 7/022 intracavitary

Abstract

A method and system for ultrasound treatment utilizing a multi-directional transducer to facilitate treatment, such as therapy and/or imaging or other tissue parameter monitoring, in two or more directions. In accordance with an exemplary embodiment, a multi-directional transducer comprises a transduction element configured to provide for ultrasound energy, such as radiation, acoustical energy, heat energy, imaging, positional information and/or tissue parameter monitoring signals in two or more directions. The transduction element can comprise various materials for providing ultrasound energy or radiation, such as piezoelectric materials, with and without matching layers. In addition, the transduction element can be configured for substantially uniform, focused and/or defocused radiation patterns, as well as for single, multiple-element and/or multiple-element array configurations. In addition, an exemplary multi-directional transducer can comprise multiple elements, either side by side, stacked or in an array.

Claims

1. An ultrasound system for facilitating treatment to at least two regions of interest, said ultrasound system comprising:

a control system configured to control operation of said ultrasound system; and

a multi-directional transducer configured for facilitating treatment in the at least two regions of interest, said multi-directional transducer comprising a single first transduction element, said single first transduction element having both a first firing face adjacent to and facing a first region of interest that is configured for radiating ultrasound energy to provide a first radiation pattern from said first firing face and a second firing face adjacent to and facing a second region of interest that is configured for radiating a second radiation pattern from said second firing face, wherein said second radiation pattern is different from said first radiation pattern and wherein said both first radiation pattern and said second radiation pattern are emitted on a single emission axis that is parallel to an axis of electrical excitation within said single first transduction element and wherein said single first transduction element expands and contracts in the same direction as said axis of electrical excitation and does not substantially expand and contract in a direction that is not parallel to the axis of electrical excitation.

2. An ultrasound system according to claim 1, wherein said single first transduction element comprises a single piezoelectrically active material.

3. An ultrasound system according to claim 2, wherein said piezoelectrically active material comprises at least one of lead zirconante titanate, lead titanate, barium titanate, lead metaniobate and lithium niobate.

4. An ultrasound system according to claim 2, wherein said single first transduction element further comprises a matching layer configured along said piezoelectrically active material.

5. An ultrasound system according to claim 1, wherein said multi-directional transducer comprises:

an electrical coupling for enabling transfer of signals to and from said single first transduction element;

a mechanical mounting mechanism configured to reduce interference from said electrical coupling; and

wherein said single first transduction element has a width at least two times the size of said single first transduction element'"'"'s thickness.

6. An ultrasound system according to claim 1, wherein said second firing face is configured to provide damping effects to acoustical energy provided by said first firing face.

7. An ultrasound system according to claim 1, wherein said second firing face is configured without acoustic isolation.

8. An ultrasound system according to claim 7, wherein said first firing face and said second firing face are configured with acoustical loading.

9. An ultrasound system according to claim 1, wherein said first firing face and said second firing face are substantially opposed.

10. An ultrasound system according to claim 1, wherein said first firing face and said second firing face are configured to generate ultrasound energy simultaneously in at least two directions.

11. An ultrasound system according to claim 1, wherein said first firing face and said second firing face are configured to generate ultrasound energy in an alternating manner in at least two directions.

12. An ultrasound system according to claim 1, wherein said ultrasound system further comprises a tubular member configured for covering said multidirectional transducer to facilitate invasive treatment.

13. An ultrasound system according to claim 12, wherein said multidirectional transducer is configured for at least one of rotational and translational movement.

14. An ultrasound system according to claim 1, wherein said control system is configured for capturing two-directional information from said multi-directional transducer with respect to a patient, and to assess the information to facilitate multi-directional therapy.

15. An ultrasound system according to claim 1, wherein said single first transduction element comprises more than two firing faces configured for radiating ultrasound energy to provide more than two radiation patterns.

16. An ultrasound system according to claim 1, wherein said multi-directional transducer comprises a combined ultrasonic imaging, therapy and temperature monitoring transducer.

17. An ultrasound system according to claim 1, wherein said ultrasound system further comprises a coupling system configured for acoustic coupling between said multi-directional transducer and the at least two regions of interest.

18. An ultrasound system according to claim 17, wherein said coupling system is configured for controlled cooling of an interface surface proximate to the at least two regions of interest to facilitate control of thermal energy effects of said ultrasound system.

19. The ultrasound system according to claim 1, wherein said multi-directional transducer is a hand-held multi-directional transducer probe.

20. The ultrasound system according to claim 1, wherein said first radiation pattern and said second radiation pattern are the only two patterns of energy emission.

21. A multidirectional transducer configured for facilitating treatment to at least two regions of interest, said multidirectional transducer comprising:

a hand-held probe;

a single first transduction element disposed within said hand-held probe, said single first transduction element having both a first firing face adjacent to and facing a first region of interest configured for radiating ultrasound energy in a first radiation pattern from said first firing face; and

a second firing face adjacent to and facing a second region of interest configured for radiating ultrasound energy in a second radiation pattern from said second firing face;

wherein both said first radiation pattern and said second radiation pattern are emitted on a single emission axis wherein said single first transduction element expands and contracts in the same direction as an axis of electrical excitation within said single first transduction element and does not substantially expand and contract in a direction that is not parallel to the axis of electrical excitation.

22. A multidirectional transducer according to claim 21, wherein said single first transduction element comprises a single piezoelectrically active material comprising at least one of lead zirconante titanate, lead titanate, barium titanate, lead metaniobate and lithium niobate.

23. A multidirectional transducer according to claim 22, wherein said single first transduction element further comprises a matching layer configured along said piezoelectrically active material.

24. A multidirectional transducer according to claim 21, wherein said single first transduction element comprises a mechanical mounting mechanism configured to reduce interference from electrical connections coupled to said single first transduction element.

25. A multidirectional transducer according to claim 24, wherein said first firing face and said second firing face are configured to generate ultrasound energy simultaneously in at least two directions.

26. A multidirectional transducer according to claim 21, wherein said second firing face is configured to provide damping effects to acoustical energy provided by said first firing face, and said first firing face and said second firing face are configured with acoustical loading.

27. A multidirectional transducer according to claim 21, wherein said first firing face and said second firing face are substantially opposed.

28. A multidirectional transducer according to claim 27, wherein said first firing face and said second firing face are configured to generate ultrasound energy in an alternating manner in at least two directions.

29. A multidirectional transducer according to claim 21, wherein said single first transduction element comprises more than two firing faces configured for radiating ultrasound energy to provide more than two radiation patterns.

30. A multidirectional transducer according to claim 21, wherein each of said first firing face and said second firing face are configured with one of a flat, concave, and convex surface.

31. A multidirectional transducer according to claim 30, wherein said first firing face and said second firing face are configured with different surfaces.

32. A multidirectional transducer according to claim 21, wherein each of said first firing face and said second firing face are configured with a flat surface and respectively coupled to a first lens and a second lens.

33. A multidirectional transducer according to claim 32, wherein each of said first lens and said second lens are configured with one of a flat, concave, and convex surface.

34. A multidirectional transducer according to claim 33, wherein said first lens and said second lens are configured with different surfaces.

35. A multidirectional transducer according to claim 21, wherein said multi-directional transducer comprises a phased array configured for electronic focusing.

36. The multi-directional transducer according to claim 21, wherein said hand-held probe is a rigid member configured to be used to treat a patient non-invasively.

37. The multi-directional transducer according to claim 21, wherein said single first transduction element has a width approximately two times the size of said single first transduction element'"'"'s thickness.

38. A method for multi-directional ultrasound treatment comprising:

generating radiation energy in a multi-directional transducer substantially in only two directions along a single emission axis that is parallel with an axis of electrical excitation of said multi-directional transducer;

radiating acoustical energy having a first radiation pattern from a first firing face of a single first transduction element of said multi-directional transducer to provide treatment in a first direction for facilitating treatment in a first region of interest; and

radiating acoustical energy having a second radiation pattern from a second firing face of said single first transduction element of said multi-directional transducer to provide treatment in a second direction for facilitating treatment in a second region of interest, wherein said first radiation pattern is different from said second radiation pattern.

39. The method according to claim 38, wherein said radiating of acoustical energy occurs from at least one of a flat, concave, and convex surface of said first firing face and said second firing face.

40. The method according to claim 38, wherein said radiating of acoustical energy occurs simultaneously from said first firing face and said second firing face.

41. The method according to claim 38, wherein said multi-directional transducer is a rigid, hand-held probe.

42. The method according to claim 41, further comprising the step of moving said multi-directional, rigid, hand-held probe across an external surface of a patient'"'"'s body.

43. An ultrasound system for facilitating treatment to at least two regions of interest, said ultrasound system comprising:

a control system configured to control operation of said ultrasound system; and

a multi-directional transducer configured for facilitating treatment in the at least two regions of interest, said multi-directional transducer comprising a single first transduction element, said single first transduction element having both a first firing face adjacent to and facing a first region of interest that is configured for radiating ultrasound energy to provide a first radiation pattern from said first firing face and a second firing face adjacent to and facing a second region of interest that is configured for radiating a second radiation pattern from said second firing face, and wherein said both first radiation pattern and said second radiation pattern are emitted on a single emission axis that is parallel to an axis of electrical excitation within said single first transduction element and wherein said single first transduction element expands and contracts in the same direction as said axis of electrical excitation and does not substantially expand and contract in a direction that is not parallel to the axis of electrical excitation.

44. The ultrasound system according to claim 43, wherein the first radiation pattern and the second radiation pattern are the same.

45. The ultrasound system according to claim 43, wherein the first radiation pattern and the second radiation pattern are different.