Percutaneous or surgical radiofrequency intravascular thrombectomy catheter system and method

• US 7,749,220 B2
• Filed: 03/28/2006
• Issued: 07/06/2010
• Est. Priority Date: 03/31/2005
• Status: Expired due to Fees

• Current Assignee: Covidien AG (Medtronic Plc)
• Original Assignee: Covidien AG (Medtronic Plc)
• Inventors: Schmaltz, Dale F.
• Primary Examiner(s): Cohen; Lee S
• Application Number:
  US11/391,620
• Publication Number:
  US 20060224155A1
• Time in Patent Office: 1,561 Days
• Field of Search: 606/7, 606 41- 42, 606 49- 50, 606/159, 606/200
• 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
• CPC Class Codes: A61B 2018/0041 Removal of thrombosis
• CPC Class Codes: A61F 2/013 Distal protection devices, i.e. devices placed distally in combination with another endovascular procedure, e.g. angioplasty or stenting

Abstract

The present disclosure relates to intravascular thrombectomy systems and methods for ablating a blockage and preventing the introduction of emboli into the blood stream during and after surgery performed to reduce or ablate the blockage in a blood vessel. The system includes a catheter sleeve having electrodes disposed proximate a distal end portion thereof, either at the distal end itself or axially spaced along the length of the catheter sleeve. The system further includes a capture element which is expandable to span the lumen of the vessel. The capture element is deployable downstream of the blockage. The electrodes of the catheter sleeve may be placed on one side of the blockage or on either side of the blockage.

Claims

1. A catheter system for ablating a partial or a complete blockage of a corporal vessel, the catheter system comprising:

a catheter sleeve including a capture element supported thereon at a location proximal to a distal end thereof,

wherein the capture element includes a first condition wherein the capture element is retracted onto the catheter sleeve and a second condition wherein the capture element is capable of at least substantially spanning the entire lumen of the corporal vessel; and

at least a pair of axially spaced apart electrodes supported on the catheter sleeve at a location proximal of the capture element, wherein each of the electrodes substantially surrounds the catheter sleeve.

2. The catheter system according to claim 1, wherein each electrode is isolated from one another.

3. The catheter system according to claim 2, wherein each electrode is electrically connectable to a source of electrosurgical energy.

4. The catheter system according to claim 2, further comprising a source of electrosurgical energy electrically connectable to each electrode of the catheter sleeve.

5. The catheter system according to claim 1, wherein the capture element forms a cage when in the second condition.

6. A catheter system for ablating a partial or a complete blockage of a corporal vessel, the catheter system comprising:

a catheter sleeve having a distal end portion;

a capture element disposed on the catheter sleeve at a location proximal to the distal end portion of the catheter sleeve, the capture element having a first condition wherein the capture element is retracted onto the catheter sleeve and a second condition wherein the capture element is capable of at least substantially spanning the entire lumen of the corporal vessel; and

at least a pair of axially spaced apart electrodes supported on the catheter sleeve at a location proximal of the capture element, wherein each electrode is connectable to a source of electrosurgical energy, wherein the pair of axially spaced apart electrodes are separated from one another by a distance such that at least one electrode is disposed distal of the blockage and at least one electrode is disposed proximal of the blockage when the capture element is in the second condition.

7. The catheter system according to claim 6, wherein the catheter sleeve is flexible and enables pushability and trackability.

8. The catheter system according to claim 6, further comprising a source of electrosurgical energy electrically connectable to each electrode.

9. The catheter system according to claim 8, wherein the electrosurgical energy source delivers an effective amount of energy to the electrodes to ablate the blockage.

10. The catheter system according to claim 6, wherein the catheter sleeve has a gauge of about 0.060 inches.

11. The catheter system according to claim 6, further comprising at least one radio-opaque marker located in close proximity to each electrode.

12. A method of ablating a blockage in a corporal vessel comprising the steps of:

introducing a catheter sleeve into the corporal vessel;

advancing the catheter sleeve through the corporal vessel to the blockage,

the catheter sleeve including a capture element supported thereon at a location proximal to a distal end thereof and at least a pair of axially spaced apart electrodes supported thereon, wherein each of the electrodes substantially surrounds the catheter sleeve;

positioning the capture element downstream of the blockage;

deploying the capture element to at least substantially span the lumen of the corporal vessel;

positioning the catheter sleeve within the corporal vessel such that at least one electrode is positioned in close proximity to the blockage; and

activating an electrosurgical energy source to energize the electrodes and ablate the blockage.

13. The method according to claim 12, further comprising the step of delivering an effective amount of energy for an effective amount of time to the blockage.

14. The method according to claim 12, wherein the capture element includes a first condition wherein the capture element is retracted onto the catheter sleeve and a second condition wherein the capture element at least substantially spans the entire lumen of the vessel.

15. The method according to claim 12, further comprising the step of advancing the catheter sleeve though the corporal vessel and through the blockage until the capture element and a distal-most electrode is positioned distal of the blockage.

16. The method according to claim 12, wherein each electrode of the catheter sleeve is electrically independent from one another.

17. The method according to claim 12, further comprising the step of positioning at least one marker proximate the electrodes to identify a location of at least one electrode relative to the blockage.