TIP FOR LEAD EXTRACTION DEVICE

• US 20080071341A1
• Filed: 10/05/2007
• Published: 03/20/2008
• Est. Priority Date: 04/15/2005
• Status: Active Grant

• Current Assignee: Cook Medical Technologies, LLC (Cook Group Incorporated)
• Original Assignee: Cook Vascular Incorporated (Cook Group Incorporated)
• Inventors: Booker, Robert, Lui, Chun, Goode, Louis
• Granted Patent: US 10,653,440 B2
• Time in Patent Office: Days
• US Class Current: 607/122
• CPC Class Codes: A61B 17/32002 with continuously rotating, oscillating or reciprocating cutting instruments
• CPC Class Codes: A61B 17/32053 Punch like cutting instruments, e.g. using a cylindrical or oval knife A61B17/326 takes precedence; trepans A61B17/1695; for use on the cornea A61F9/007
• CPC Class Codes: A61B 17/3207 Atherectomy devices working by cutting or abrading; Similar devices specially adapted for non-vascular obstructions A61B17/32037 takes precedence; endoscopic cutting instruments A61B17/320016
• CPC Class Codes: A61B 17/3468 for implanting or removing devices, e.g. prostheses, implants, seeds, wires devices for implanting seeds A61M37/0069
• CPC Class Codes: A61B 2017/320044 Blunt dissectors
• CPC Class Codes: A61B 2017/320741 for stripping the intima or the internal plaque from a blood vessel, e.g. for endarterectomy
• CPC Class Codes: A61N 1/056 Transvascular endocardial electrode systems
• CPC Class Codes: A61N 2001/0578 having means for removal or extraction

Abstract

A tip engageable with an elongated sheath member for extracting an implanted elongated structure, such as a cardiac lead, from an obstruction in a body vessel of a patient. The tip includes a tip body having a proximal end, a distal end, and a passageway extending therethrough. The tip body proximal end is engageable with the distal end of the sheath member distal end. The passageway of the tip is aligned with the passageway of the sheath such that the implanted structure is receivable therein. The tip body distal end includes a segment tapering toward a leading edge. A disrupter element, such as a plurality of helices, is disposed along the outer surface of the tip body distal end. The disruptor element is configured for non-cuttingly disrupting the obstruction as the tip is advanced over the implanted structure.

Claims

1. A tip engageable with an elongated sheath member for extracting an implanted structure from an obstruction in a body vessel of a patient, said sheath member having a distal end and a passageway extending at least substantially therethrough, said tip comprising:

a tip body having a proximal end, a distal end, and a passageway extending therethrough, said tip body proximal end engageable with said sheath member distal end, said respective passageways dimensioned and aligned such that said implanted structure is receivable therein, said tip body distal end including a segment tapering toward a leading edge, a disrupter element disposed along an outer surface of said tip body distal end, said disrupter element disposed proximal of at least said leading edge of said tapered segment along said outer surface, said disruptor element configured for disrupting said obstruction as said tip is advanced over said implanted structure.

2. The tip of claim 1, wherein said disrupter element comprises a helical structure disposed along said outer surface, and wherein a distalmost portion of said leading edge comprises a generally rounded profile.

3. The tip of claim 2, wherein said disrupter element comprises a plurality of helices disposed along said outer surface.

4. The tip of claim 3, wherein at least one of said helices has a discontinuity along its length, and wherein said helices are disposed proximal of said tapered segment.

5. The tip of claim 1, wherein said tip body has a smaller diameter proximal end and a larger diameter distal end, said smaller diameter proximal end sized and configured for engagement with an inner surface of said sheath member distal end.

6. The tip of claim 5, wherein said tip body smaller diameter proximal end includes an attachment member configured for engaging said inner surface of said sheath member distal end, said attachment member comprising a plurality of rings spaced along said tip body outer surface, said rings being aligned in order of increasing ring width in a direction of said tip distal end.

7. The tip of claim 6, wherein at least one of said rings includes a cut-out portion for inhibiting rotation of said tip, upon engagement with said sheath member.

8. An apparatus for extracting an elongate implanted structure from an obstruction within a vessel of a patient, comprising:

an elongate sheath member comprising a lumen sized to receive the elongated implanted structure therein, the elongate sheath member being sufficiently flexible to track over the implanted structure within the vessel; and

a tip disposed at the distal end of the sheath member comprising an outer surface having at least one disrupter element disposed at least partially thereabout, said tip having a leading edge configured for non-cutting engagement with said obstruction such that advancement of the sheath over the implanted structure and into the obstruction causes the at least one disruptor element to push aside and separate the obstruction from the implanted structure without a forward cutting action.

9. The apparatus of claim 8, wherein said leading edge is generally rounded, and said tip comprises a segment that tapers toward said leading edge, and wherein said disruptor element is spaced from said leading edge of said tip.

10. The apparatus of claim 8, wherein said disruptor element comprises one or more helical structures disposed along an outer surface of said tip.

11. The apparatus of claim 10, wherein at least one of said helical structures has a discontinuity along a length of said structure.

12. The apparatus of claim 8, further comprising a drive member operationally engaged with said elongate sheath member for driving at least one of rotational and axial movement of said sheath member.