Cutting wire assembly for use with a catheter

• US 8,685,049 B2
• Filed: 09/07/2011
• Issued: 04/01/2014
• Est. Priority Date: 11/18/2010
• Status: Active Grant

• Current Assignee: REX Medical LP
• Original Assignee: REX Medical LP
• Inventors: Schur, Israel, McGuckin, James F. Jr., Bressler, James Erich
• Primary Examiner(s): FISHBACK, ASHLEY LAUREN
• Application Number:
  US13/226,699
• Publication Number:
  US 20120130408A1
• Time in Patent Office: 937 Days
• Field of Search: 604/93.01, 604/96.01, 60410101-10105, 606/159, 606167-171, 606/180, 606/191, 606/192
• US Class Current: 606/159
• CPC Class Codes: A61B 17/320725 with radially expandable cutting or abrading elements A61B17/32075 takes precedence
• CPC Class Codes: A61B 2017/22001 Angioplasty, e.g. PCTA
• CPC Class Codes: A61B 2017/22038 with a guide wire
• CPC Class Codes: A61B 2017/22051 with an inflatable part, e.g. balloon, for positioning, blocking, or immobilisation A61B2017/22048, A61B2017/3486 take precedence

Abstract

A method of treating a lesion in a body lumen to enlarge a passageway in the lumen including inserting a plurality of cutting members and a tracking member through a first lumen of a catheter, withdrawing the catheter from the cutting members and tracking member, inserting the catheter over the tracking member and leaving the cutting members outside the catheter, and expanding a portion of the catheter to move the cutting members into cutting contact with the lesion. A device for treating a lesion in a body lumen including a plurality of cutting members and a tracking member is also provided.

Claims

1. A method of treating a lesion in a body lumen in a patient'"'"'s body, the method comprising:

inserting a tracking member and a plurality of cutting members through a first lumen of a catheter;

withdrawing the catheter from the cutting members and tracking member and removing the catheter from the body lumen;

subsequently inserting the catheter over a proximal end of the tracking member extending outside the patient'"'"'s body, and leaving the cutting members outside the catheter as the catheter is advanced over the tracking member; and

expanding a portion of the catheter to move the cutting members into cutting contact with the lesion to thereby enlarge a passageway in the body lumen.

2. The method of claim 1, wherein the portion of the catheter to move the cutting members includes an expandable balloon, and the step of expanding a portion of the catheter includes a step of expanding the balloon.

3. The method of claim 2, wherein the step of expanding the balloon causes the plurality of cutting members to be moved radially with respect to the catheter.

4. The method of claim 1, wherein the step of expanding a portion of the catheter causes a gap between the cutting members and tracking guidewire to widen.

5. The method of claim 1, wherein the cutting members have a cutting surface on a first surface opposite a second surface facing the tracking member, and expansion of the portion of the catheter forces the cutting surfaces into contact with the lesion.

6. The method of claim 1, wherein at least one of the cutting members and the tracking member are attached at a distal end and inserted as a unit through the first lumen of the catheter.

7. The method of claim 1, wherein a length of the tracking member exceeds a length of the cutting members.

8. The method of claim 1, wherein the cutting members have a first portion of a first configuration and a second portion of a second configuration, the second portion including a cutting surface and the first portion being atraumatic.

9. The method of claim 8, wherein a height of the second portion is less than a height of the first portion.

10. The method of claim 1, further comprising marker bands on the tracking member.

11. The method of claim 1, wherein the tracking member has a coil at a distal tip.

12. The method of claim 11, further comprising a shrink wrap over a portion of the tracking member and a portion of the cutting members.

13. A method of treating a lesion in a body lumen in a patient'"'"'s body, the method comprising:

inserting a plurality of cutting members and a tracking member into a vessel;

subsequently inserting a catheter into the patient'"'"'s body over a proximal end of the tracking member extending outside the patient'"'"'s body so the tracking member extends through a first lumen of the catheter and the cutting members do not extend through the first lumen; and

moving the cutting members away from the tracking member into cutting contact with the lesion to enlarge a passageway in the body lumen.

14. The method of claim 13, wherein the step of inserting the plurality of cutting members and tracking member comprises a step of inserting the cutting members and tracking member through a lumen of the same catheter subsequently inserted over the tracking member.

15. The method of claim 13, wherein the step of moving the cutting members comprises a step of expanding a balloon of the catheter.

16. The method of claim 13, wherein the cutting members and tracking member are attached at a distal end and inserted as a unit into the vessel.

17. The method of claim 13, wherein the cutting members are wires and the tracking member is a wire.

18. The method of claim 17, wherein the cutting members are substantially circular in cross-section in a proximal region and substantially triangular in a distal region.

19. A method of treating a lesion in a body lumen, the method comprising:

inserting a plurality of cutting members and a tracking member into the vessel;

inserting a catheter over the tracking member so the tracking member extends through a first lumen of the catheter and the cutting members do not extend through the first lumen; and

moving the cutting members away from the tracking member into cutting contact with the lesion to enlarge a passageway in the body lumen;

wherein the step of inserting the plurality of cutting members and tracking member includes a step of inserting the cutting members and tracking member through a lumen of a second catheter, the second catheter being different than the catheter inserted over the tracking member.