Rotatable apparatus having ablation capabilities

• US 6,102,908 A
• Filed: 01/04/1999
• Issued: 08/15/2000
• Est. Priority Date: 01/04/1999
• Status: Expired due to Fees

• Current Assignee: Irvine Biomedical, Inc. (Abbott Laboratories)
• Original Assignee: Hosheng Tu, Lily Chen Tu
• Inventors: Tu, Hosheng, Tu, Lily Chen
• Primary Examiner(s): PEFFLEY, MICHAEL F
• Application Number:
  US09/225,079
• Time in Patent Office: 589 Days
• Field of Search: 606/27-31, 606/41, 606/42, 606/191, 606/194, 606/198, 604/96
• US Class Current: 606/41
• CPC Class Codes: A61B 18/1492 having a flexible, catheter-like structure, e.g. for heart ablation A61B18/1477 takes precedence
• CPC Class Codes: A61B 2018/00214 Expandable means emitting energy, e.g. by elements carried thereon

Abstract

An ablation apparatus system for treating tissues or obstructions in vessels in the body includes a rotatable metallic member which is guided to the obstruction in a reduced diameter configuration, expanded and rotated to contact the tissue, optionally to remove the obstruction, and a RF current is applied to the tissue-contacting rotatable metallic member or the expanded stent for treating the tissues.

Claims

1. An ablation apparatus for supporting and ablating a vessel in an introduction of the ablation apparatus into the vessel, comprising:

a tubular shaft having a shaft distal section, a shaft distal end, and a shaft proximal end;

a handle attached to the shaft proximal end;

an expandable stent disposed on the shaft distal section;

an expandable member disposed between the tubular shaft and the expandable stent;

a RF current generator, wherein an electrical conductor is coupled from the RF current generator to the expandable stent for delivering RF current to said expandable stent for ablating the vessel, and wherein the RF current is within the range of 50 to 2,000 kHz; and

a rotating member extending through the tubular shaft and being rotatable within the tubular shaft, wherein a helically wound metallic member is attached to the rotating member.

2. An ablation apparatus for removing an obstruction and ablating a vessel, comprising:

a tubular shaft;

a hollow rotating member rotatably disposed within the tubular shaft;

a metallic member disposed on an end of the hollow rotating member and forming an expandable circumferential outer surface;

the expandable circumferential outer surface having a metallic contacting surface covering at least a portion of said circumferential outer surface;

a movable member disposed within the hollow rotating member;

the metallic member having one end coupled to said movable member and another end coupled to said hollow rotating member;

an expandable member disposed beneath said metallic member for expanding the expandable metallic member into supporting engagement with the vessel; and

a RF current generator, wherein an electrical conductor is coupled from the RF current generator to the metallic member for delivering RF current to said metallic member for ablating the vessel.

3. The ablation apparatus of claim 2, wherein the metallic member is helically wound.

4. The ablation apparatus of claim 2, wherein the expandable member is an inflatable balloon.

5. The ablation apparatus of claim 4, wherein the tubular shaft includes a fluid passageway for inflating said inflatable balloon.

6. The ablation apparatus of claim 2, wherein the metallic member is a memory coil.

7. The ablation apparatus of claim 2, wherein material for the metallic member is selected from the group consisting of platinum, iridium, gold, silver, stainless steel, Nitinol, or an alloy of their mixtures.

8. A method for removing an obstruction and ablating a vessel of a patient using an ablation apparatus, the ablation apparatus comprising:

a tubular shaft;

a hollow rotating member rotatably disposed within the tubular shaft;

a metallic member disposed on an end of the hollow rotating member and forming an expandable circumferential outer surface;

the expandable circumferential outer surface having a metallic contacting surface covering at least a portion of said circumferential outer surface;

a movable member disposed within the hollow rotating member;

the metallic member having one end coupled to said movable member and another end coupled to said hollow rotating member;

an expandable member disposed beneath said metallic member for expanding the expandable metallic member into supporting engagement with the vessel; and

a RF current generator, wherein an electrical conductor is coupled from the RF current generator to the metallic member for delivering RF current to said metallic member for ablating the vessel;

the method comprising the steps of;

(a) inserting the ablation apparatus through an artery or a vein to the location of the vessel of a patient for ablation;

(b) deploying the expandable metallic member; and

(c) applying RF current to the expandable metallic member to effect treatment of ablating the vessel.

9. A method for removing an obstruction and ablating a vessel of a patient using an ablation apparatus of claim 8, wherein the expandable member is an inflatable balloon.