Microwave garment for heating and/or monitoring tissue

• US 6,330,479 B1
• Filed: 12/06/1999
• Issued: 12/11/2001
• Est. Priority Date: 12/07/1998
• Status: Expired due to Term

• Current Assignee: Regents of the University of California (University of California)
• Original Assignee: Regents of the University of California (University of California)
• Inventors: Stauffer, Paul R.
• Primary Examiner(s): GIBSON, ROY DEAN
• Application Number:
  US09/455,303
• Time in Patent Office: 736 Days
• Field of Search: 607/96-99, 607/101-102, 607/104, 607/154, 607/155
• US Class Current: 607/101
• CPC Class Codes: A61B 2562/046 in a matrix array
• CPC Class Codes: A61B 5/015 By temperature mapping of body part
• CPC Class Codes: A61B 5/0507 using microwaves or terahertz waves
• CPC Class Codes: A61N 5/02 using microwaves

Abstract

A flexible microwave applicator and method of use thereof. The applicator includes a flexible, dielectric-containing compartment (e.g. temperature regulated water or oil) having a variable contour, tissue-engaging surface and an opposite non-tissue-engaging surface and an antenna array adjacent to a non-tissue-engaging surface. The antenna array includes at least one flexible printed circuit board having a front metal surface, a dielectric substrate, a back metal surface, a connection structure for connecting the antenna array to at least one external microwave device, at least one dual concentric conductor aperture on the front surface, and at least one microstrip feedline in communication with the dual concentric conductor aperture and the connection structure. The microwave applicator also includes flexible attachment material for placement over the antenna array and dielectric compartment to allow the microwave applicator to be attached to a subject like a garment which closely conforms to the anatomy portion to be heated. The flexible attachment material may be configured such that the microwave applicator is configured as an appropriately-shaped type of garment, for example, a vest, jacket, cap, hood, blanket, custom shaped conformal wrap, sleeve, or as a pair of shorts.

Claims

1. A flexible conformal microwave applicator, the applicator comprising:

a flexible, dielectric containing compartment having a variable contour, tissue-engaging surface and an opposite, non-tissue-engaging surface;

an antenna array adjacent to the non-tissue-engaging surface and comprising;

at least one flexible printed circuit board comprising a front metal surface, a dielectric substrate, a back metal surface, and connection means for connecting the antenna array to at least one external microwave device;

at least one dual concentric conductor (DCC) radiating aperture on the front surface; and

at least one microstrip feedline in communication with the dual concentric conductor aperture and the connection means; and

flexible attachment material for placement over the antenna array and dielectric compartment to allow the microwave applicator to be attached to a subject.

2. The microwave applicator of claim 1 wherein the antenna array comprises a plurality of dual concentric conductor radiating apertures on the front surface and a plurality of feedlines in communication with the dual concentric conductor radiating apertures and the connection means.

3. The microwave applicator of claim 1 further comprising non-invasive temperature monitoring means for monitoring the temperature of superficial tissue of the subject.

4. The microwave applicator of claim 3 wherein the temperature monitoring means comprises at least one plastic catheter molded into the tissue-engaging surface and at least one temperature sensor that is placed within or pulled repeatedly through the catheter.

5. The microwave applicator of claim 3 wherein the temperature monitoring means comprises radiometric imaging means located on the flexible printed circuit board.

6. The microwave applicator of claim 5 wherein the radiometric imaging means comprises at least one complimentary antenna that is located within a central portion of a DCC aperture.

7. The microwave applicator of claim 5 wherein the radiometric imaging means is accomplished by time-sequenced heating and sensing from at least one aperture of the at least one dual concentric conductor aperture.

8. The microwave applicator of claim 6 wherein the complimentary antenna comprises a second smaller dual concentric conductor aperture concentric within the central portion of a dual concentric conductor aperture.

9. The microwave applicator of claim 6 wherein the complimentary antenna comprises a microstrip antenna within the central portion of a dual concentric conductor aperture.

10. The microwave applicator of claim 6 wherein the complimentary antenna comprises a spiral microstrip antenna within the central portion of a dual concentric conductor aperture.

11. The microwave applicator of claim 5 wherein the radiometric imaging means comprises at least one complimentary antenna located in a metal layer of the printed circuit board that is different from the dual concentric conductor and at least partially overlaps a dual concentric conductor aperture.

12. The microwave applicator of claim 11 wherein the complimentary antenna comprises at least one spiral microstrip antenna that partially overlaps a dual concentric conductor aperture.

13. The microwave applicator of claim 1 further comprising a support belt to act as a strain relief and a support for connecting microwave coaxial cables and tubes for circulating cooling fluid.

14. The microwave applicator of claim 1 wherein the dielectric containing compartment has a thickness in a range of 0.25 cm to 2.5 cm.

15. The microwave applicator of claim 14 wherein the dielectric containing compartment has a thickness in a range of 0.5 cm to 1.5 cm.

16. The microwave applicator of claim 14 wherein the dielectric containing compartment has a thickness 0.75 cm.

17. The microwave applicator of claim 1 wherein the flexible attachment material is configured such that the microwave applicator is configured as a vest.

18. The microwave applicator of claim 1 wherein the flexible attachment material is configured such that the microwave applicator is configured as a jacket.

19. The microwave applicator of claim 1 wherein the flexible attachment material is configured such that the microwave applicator is configured as a custom shaped informal wrap.

20. The microwave applicator of claim 1 wherein the flexible attachment material is configured such that the microwave applicator is configured as a blanket.

21. The microwave applicator of claim 1 wherein the flexible attachment material is configured such that the microwave applicator is configured as a cap.

22. The microwave applicator of claim 1 wherein the flexible attachment material is configured such that the microwave applicator is configured as a sleeve.

23. The microwave applicator of claim 1 wherein the flexible attachment material is configured such that the microwave applicator is configured as a pair of shorts.

24. The microwave applicator of claim 1 wherein the external microwave devices are microwave power sources.

25. The microwave applicator of claim 1 wherein the external microwave devices are high gain microwave receivers.

26. A flexible conformal microwave applicator comprising:

a flexible bolus having a tissue-engaging surface and an opposite non-tissue-engaging surface;

an antenna array adjacent to the non-tissue-engaging surface and comprising;

at least one flexible printed circuit board comprising a front metal surface, a dielectric substrate, a back metal surface, and connection means for connecting the antenna array to a plurality of external microwave devices;

a plurality of dual concentric conductor (DCC) apertures on the front surface; and

a plurality of microstrip feedlines in communication with the dual concentric conductor apertures and the connection means; and

flexible attachment material for placement over the antenna array and bolus to allow the microwave applicator to be securely attached to a subject.

27. The microwave applicator of claim 26 further comprising non-invasive temperature monitoring means for monitoring the temperature of superficial tissue.

28. The microwave applicator of claim 27 wherein the temperature monitoring means comprises at least one plastic catheter or open lumen channel molded into the tissue-engaging surface and at least one temperature sensor that is within or pulled repeatedly through the catheter or open lumen channel.

29. The microwave applicator of claim 28 wherein the temperature monitoring means comprises a plurality of plastic catheters or channels molded into the tissue-engaging surface and a plurality of temperature sensors that are within or pulled repeatedly through the catheters.

30. The microwave applicator of claim 28 wherein the temperature monitoring means comprises radiometric imaging means located on the flexible printed circuit board.

31. The microwave applicator of claim 30 wherein the radiometric imaging means comprises at least one complimentary antenna that is located within or at least partially overlaps a central portion of a DCC radiating aperture and consists of one of a dual concentric conductor aperture.

32. The microwave applicator of claim 30 wherein the radiometric imaging means comprises at least one complimentary antenna that is located within or at least partially overlaps a central portion of a DCC radiating aperture and consists of one of a microstrip antenna.

33. The microwave applicator of claim 30 wherein the radiometric imaging means comprises at least one complimentary antenna that is located within or at least partially overlaps a central portion of a DCC radiating aperture and consists of one of a spiral microstrip antenna.

34. The microwave applicator of claim 30 wherein the radiometric imaging means is accomplished by time-sequenced heating and sensing from at least one of the dual concentric conductor apertures.

35. The microwave applicator of claim 26 further comprising a support belt to act as a strain relief and support for connecting microwave coaxial cables and circulating cooling fluid tubes.

36. The microwave applicator of claim 26 wherein the fluid compartment has a thickness in a range of 0.25 cm to 2.5 cm.

37. The microwave applicator of claim 36 wherein the fluid compartment has a thickness in a range of 0.5 cm to 1.5 cm.

38. The microwave applicator of claim 37 wherein the fluid compartment has a thickness of 0.75 cm.

39. The microwave applicator of claim 26 wherein the flexible attachment material is configured such that the microwave applicator is configured as a vest.

40. The microwave applicator of claim 26 wherein the flexible attachment material is configured such that the microwave applicator is configured as a jacket.

41. The microwave applicator of claim 26 wherein the flexible attachment material is configured such that the microwave applicator is configured as a custom shaped conformal wrap.

42. The microwave applicator of claim 26 wherein the flexible attachment material is configured such that the microwave applicator is configured as a blanket.

43. The microwave applicator of claim 26 wherein the flexible attachment material is configured such that the microwave applicator is configured as a sleeve.

44. The microwave applicator of claim 26 wherein the flexible attachment material is configured such that the microwave applicator is configured as a pair of shorts.

45. The microwave applicator of claim 26 wherein the flexible attachment material is configured such that the microwave applicator is configured as a cap.

46. A method of heating and monitoring superficial tissue over contoured anatomy, the method comprising:

providing a microwave applicator comprising;

a flexible, dielectric-containing compartment having a tissue-engaging surface and an opposite non-tissue-engaging surface;

an antenna array adjacent to the non-tissue-engaging surface and comprising;

at least one flexible printed circuit board comprising a front metal surface, a dielectric substrate, a back metal surface, and connection means for connecting the antenna array to at least one external microwave device;

at least one dual concentric conductor aperture on the front surface; and

at least one microstrip feedline in communication with the dual concentric conductor aperture and the connection means; and

flexible attachment material for placement over the antenna array and dielectric compartment to allow the microwave applicator to be securely attached to a subject;

placing the microwave applicator over the target tissue on a subject;

conforming the microwave applicator to fit the contour of the patient anatomy to be treated; and

supplying power from the power source to the at least one connection means and thereby to the at least one microstrip feedline and the at least one dual concentric conductor radiating aperture; and

creating a radiating microwave field within the contoured anatomy of the patient with the at least one dual concentric conductor aperture to thereby heat superficial tissue located directly under the corresponding radiating aperture.

47. The method of claim 46 with the method further comprising

non-invasive monitoring of physiologic tissue properties.

48. The method of claim 46 wherein the amount of power supplied is in a range of 0.1-10,000 Watts per aperture.

49. The method of claim 46 wherein the amount of power supplied is continuous wave in a range of 5-50 Watts per aperture.

50. The method of claim 46 wherein the amount of power supplied is continuous wave less than 35 Watts per aperture.

51. The method of claim 46 wherein the power is applied at a frequency in a range of 300-5000 MHz.

52. The method of claim 51 wherein the power is continuous wave applied at a frequency in a range of 400-2500 MHz.

53. The method of claim 52 wherein the power is continuous wave applied at a frequency of 915 MHz.

54. The method of claim 46 further comprising simultaneous heating and non-invasive monitoring of physiologic tissue properties..

55. The method of claim 54 wherein the monitoring of the temperature or other physiologic property is accomplished by radiometric imaging.

56. The method of claim 46 wherein the microwave applicator comprises a plurality of dual concentric conductor apertures and a plurality of microstrip feedlines.

57. The method of claim 46 wherein the microwave applicator comprises a plurality of dual concentric conductor apertures, a plurality of complimentary microstrip antenna structures, and a plurality of microstrip feedlines connected to the connection means.

58. The method of claim 57 wherein the amount of power supplied is less than 50 Watts per aperture.

59. The method of claim 57 further comprising monitoring changes in physiologic tissue properties of the superficial tissue.

60. The method of claim 59 wherein the monitoring of physiologic tissue properties is accomplished by radiometric imaging.