Use of at least one composite piezoelectric transducer in the manufacture of an ultrasonic therapy apparatus for applying therapy, in a body zone, in particular to concretions, to tissue, or to bones, of a living being and method of ultrasonic therapy

• US 5,316,000 A
• Filed: 01/21/1992
• Issued: 05/31/1994
• Est. Priority Date: 03/05/1991
• Status: Expired due to Term

• Current Assignee: Institut National De La Sante Et De La Recherche Medicale (Inserm) (Allianz Global Investors GmbH), Technomed Medical Systems
• Original Assignee: Institut National de La Recherche Agronomique, Technomed International
• Inventors: Blanc, Emmanuel, Chapelon, Jean-Yves, Cathignol, Dominique
• Primary Examiner(s): Cohen, Lee S.
• Assistant Examiner(s): Casler, Brian L.
• Application Number:
  US07/823,306
• Time in Patent Office: 861 Days
• Field of Search: 128/660.03, 128/24 AA, 128/24 EL, 310/334, 310/335, 607/97
• US Class Current: 600/439
• CPC Class Codes: A61B 17/22004 using mechanical vibrations, e.g. ultrasonic shock waves A61B17/225 takes precedence
• 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 17/2202 the ultrasound transducer being inside patient's body at the distal end of the catheter
• CPC Class Codes: A61B 2017/00274 Prostate operation, e.g. prostatectomy, turp, bhp treatment
• CPC Class Codes: A61B 2017/22021 electric leads passing through the catheter
• CPC Class Codes: A61B 2017/22025 applying a shock wave A61B2017/22091 takes precedence
• CPC Class Codes: A61B 2017/22028 arrays, e.g. phased arrays
• CPC Class Codes: A61B 2018/00547 Prostate
• CPC Class Codes: A61N 7/02 Localised ultrasound hyperthermia hyperthermia in general A61F7/00
• CPC Class Codes: A61N 7/022 intracavitary
• CPC Class Codes: B06B 1/06 operating with piezoelectric effect or with electrostriction piezoelectric or electrostrictive devices per se H10N30/00

Abstract

The invention relates to a composite piezoelectric transducer for making an acoustic or an ultrasonic therapeutic apparatus. The transducer may be a single large-size transducer or it may be a multi-transducer device and it advantageously emits ultrasonic waves that are focused on a focal point.

Claims

1. A method for effecting therapeutic treatment of a body zone, comprising:

providing at least one composite piezoelectric transducer element for emitting ultrasound waves, wherein said composite transducer element comprises piezoelectric ceramic material in combination with a polymer; and

applying a current to said composite piezoelectric transducer element for causing said piezoelectric transducer element to emit ultrasound waves having sufficient acoustic energy for effecting said therapeutic treatment of said body zone.

2. The method of claim 1, further comprising the steps of focusing said ultrasound waves emitted by said piezoelectric transducer element to a focus, and bringing said body zone into coincidence with said focus for effecting said therapeutic treatment.

3. The method of claim 2, wherein said step of providing at least one composite piezoelectric transducer element comprises providing a plurality of composite piezoelectric transducer elements.

4. The method of claim 3, wherein said step of focusing said ultrasound waves comprises orienting said plurality of composite piezoelectric transducer elements such that their respective emitted ultrasound waves coincide at said focus.

5. The method of claim 3, wherein said step of focusing said ultrasound waves comprises applying current to said plurality of composite piezoelectric transducer elements with predetermined phase shifts.

6. The method of claim 3, wherein said step of applying a current to said plurality of composite piezoelectric transducer elements comprises applying a sufficient current for generating an energy greater than 0.01 joule per pulse.

8. The method of claim 3, further comprising the step of using at least a first piezoelectric transducer element for effecting imaging of said body zone.

9. The method of claim 8, further comprising the step of selectively applying said current to said at least a first piezoelectric transducer element for effecting imaging of said body zone.

10. The method of claim 3, wherein said step of applying a current comprises applying a current for effecting one of lithotrity, hyperthermia and tissue removal.

11. The method of claim 1, wherein said step of applying a current to said at least one composite piezoelectric transducer element comprises applying a sufficient current for generating an energy greater than 0.01 joule per pulse.

12. The method of claim 1, wherein said step of applying a current comprises applying a current for effecting one of lithotrity, hyperthermia and tissue removal.

7. The method of claim, wherein said step of applying a current comprises applying a current for effecting one of lithotrity, hyperthermia and tissue removal.

13. An apparatus for effecting therapeutic treatment of a body zone, comprising:

at least one composite piezoelectric transducer element for emitting ultrasound waves, wherein said composite transducer element comprises piezoelectric ceramic material in combination with a polymer; and

means for applying a current to said composite piezoelectric transducer element for causing said piezoelectric transducer element to emit ultrasound waves having sufficient acoustic energy for effecting said therapeutic treatment of said body zone.

14. The apparatus of claim 13, further comprising means for focusing said ultrasound waves emitted by said piezoelectric transducer element to a focus, whereby said body zone may be brought into coincidence with said focus for effecting said therapeutic treatment.

15. The apparatus of claim 14, wherein said at least one composite piezoelectric transducer element comprises a plurality of composite piezoelectric transducer elements.

16. The apparatus of claim 15, wherein said means for focusing said ultrasound waves comprises means for orienting said plurality of composite piezoelectric transducer elements such that their respective emitted ultrasound waves coincide at said focus.

17. The apparatus of claim 15, wherein said means for focusing said ultrasound waves comprises means for applying current to said plurality of composite piezoelectric transducer elements with predetermined phase shifts.

18. The apparatus of claim 15, wherein said means for applying a current to said plurality of composite piezoelectric transducer elements comprises means for applying a sufficient current for generating an energy greater than 0.01 joule per pulse.

19. The apparatus of claim 18, wherein said means for applying a current comprises means for applying a current for generating sufficient energy for effecting one of lithotrity, hyperthermia and tissue removal.

20. The apparatus of claim 15, wherein at least a first piezoelectric transducer element is useable for effecting imaging of said body zone and further comprises, means for selectively applying said current to said at least a first piezoelectric transducer element 4 effecting imaging of said body zone.

21. The apparatus of claim 15, wherein said means for applying a current comprises means for applying a current for generating sufficient energy for effecting one of lithotrity, hyperthermia and tissue removal.

22. The apparatus of claim 13, wherein said means for applying a current to said at least one composite piezoelectric transducer element comprises means for applying a sufficient current for generating a energy greater than 0.01 joule per pulse.

23. The apparatus of claim 13, wherein said means for applying a current comprises means for applying a current for generating sufficient energy for effecting one of lithotrity, hyperthermia and tissue removal.