Method and device for recanalization of a body passageway

• US 5,178,618 A
• Filed: 01/16/1991
• Issued: 01/12/1993
• Est. Priority Date: 01/16/1991
• Status: Expired due to Term

• Current Assignee: Brigham and Women's Hospital Incorporated
• Original Assignee: Brigham and Women's Hospital Incorporated
• Inventors: Kandarpa, Krishna
• Primary Examiner(s): Cohen, Lee S.
• Application Number:
  US07/641,890
• Time in Patent Office: 727 Days
• Field of Search: 606/41, 606/34, 606/27-29, 606/31, 606/191, 606/194, 606/195, 606/198
• US Class Current: 606/28
• CPC Class Codes: A61B 18/082 Probes or electrodes therefor
• CPC Class Codes: A61B 18/28 for heating a thermal probe or absorber
• CPC Class Codes: A61B 2017/22002 preventing restenosis
• CPC Class Codes: A61B 2017/22061 for spreading elements apart
• CPC Class Codes: A61F 2/95 Instruments specially adapted for placement or removal of stents or stent-grafts
• CPC Class Codes: A61M 25/104 used for angioplasty

Abstract

The present invention relates to a method and device for the recanalization of an occluded blood vessel which includes an expandable wire-mesh stent or support and an external radio frequency (rf) energy source or other suitable heat generating device. The device of the present invention may also be used to recanalize other occluded body passageways or conduits.

Claims

1. A device for recanalization of an occluded body passageway, comprising:

a stent, wherein said stent may be inserted into said occluded body passageway and has sufficient radial resistance to recanalize said passageway; and

means for destroying cells of said body passageway which may reocclude the same by heating said stent to a temperature between 50°

C. and 100°

C.

2. The device of claim 1, wherein said stent is a balloon expandable stent.

3. The device of claim 1, wherein said stent is biased to exert a radial force against the passageway.

4. The device of claim 1, wherein said means for heating said stent is a resistive heater.

5. The device of claim 1, wherein said means for heating said stent generates microwaves at a frequency sufficient to couple to said stent.

6. The device of claim 1, wherein said means for heating said stent is a laser radiation source.

7. The device of claim 1, wherein said means for heating said stent is an optical fiber.

8. The device of claim 1, wherein said stent is metallic.

9. The device for recanalization of an occluded body passageway, comprising:

a stent, wherein said stent may be inserted into said occluded body passageway and has sufficient radial resistance to recanalize said passageway; and

a means for destroying cells of said body passageway which may reocclude the same by heating said body passageway to a temperature between 50°

C. and 100°

C.

10. The device of claim 9, wherein said stent is a balloon expandable stent.

11. The device of claim 9, wherein said stent is biased to exert a radial force against said body passageway.

12. The device of claim 9, wherein said means for heating said body passageway is a radio frequency source.

13. The device of claim 12, wherein said radio frequency source is external to said body passageway.

14. The device of claim 13, wherein said radio frequency source includes paired multiple feed inductor rings positioned between a plurality of capacitor plates for producing a tuned radio frequency electromagnetic field.

15. The device of claim 9, wherein said stent is metallic.

16. A method for recanalizing an occluded body passageway comprising the steps of:

a) introducing a balloon catheter having a stent disposed about said catheter into a passageway to a location proximate an occlusion;

b) expanding said balloon catheter thereby expanding said stent;

c) applying heat to said stent; and

d) removing said balloon catheter from said passageway.

17. The method of claim 16, wherein said stent is heated to a temperature between 50°

C. and 100°

C.

18. The method of claim 16, wherein said stent is biased to exert a radial force against the passageway.

19. The method of claim 16, wherein said heat is generated by a resistive heater.

20. The method of claim 16, wherein said heat is generated by microwaves at a frequency sufficient to couple to the material forming the stent.

21. The method of claim 16, wherein said heat is generated by a laser radiation source.

22. The method of claim 16, wherein said heat is generated by an optical fiber.

23. A method for recanalizing an occluded body passageway comprising the steps of:

a) introducing a balloon catheter having a stent disposed about said catheter into a passageway to a location proximate an occlusion;

b) expanding said balloon catheter thereby expanding said stent;

c) applying heat to the tissue of said passageway; and

d) removing said balloon catheter from said passageway.

24. The method of claim 23, wherein said stent is biased to exert a radial force against the passageway.

25. The method of claim 23, wherein said passageway is heated to a temperature between 50°

C. and 100°

C.

26. The method of claim 23, wherein said heat is generated by a radio frequency source.

27. The method of claim 26, wherein said radio frequency source is external to said passageway.

28. The method of claim 27, wherein said step of applying heat to the tissue of said passageway utilizes paired multiple feed inductor rings positioned between a plurality of capacitor plates to produce a tuned radio frequency electromagnetic field.