Embolic obstruction retrieval devices and methods

• US 8,795,317 B2
• Filed: 07/08/2009
• Issued: 08/05/2014
• Est. Priority Date: 07/08/2009
• Status: Active Grant

• Current Assignee: Stryker Corporation
• Original Assignee: Concentric Medical, Inc. (Stryker Corporation)
• Inventors: Grandfield, Ryan M., Wilson, Scott D., Miller, John H., Vu, Emily, Pedersen, Kirk L., Bonsignore, Craig L., Sanders, Elliot H.
• Primary Examiner(s): HOLWERDA, KATHLEEN SONNETT
• Application Number:
  US12/499,713
• Publication Number:
  US 20110009875A1
• Time in Patent Office: 1,854 Days
• Field of Search: 606/110, 606/113, 606/127, 606/128, 606/200, 606/159
• US Class Current: 606/200
• CPC Class Codes: A61B 17/221 Gripping devices in the form of loops or baskets for gripping calculi or similar types of obstructions surgical snare instruments A61B17/32056
• CPC Class Codes: A61B 2017/00867 shape memory effect
• CPC Class Codes: A61B 2017/2215 having an open distal end
• CPC Class Codes: A61B 2017/2217 single wire changing shape to a gripping configuration

Abstract

An embolic obstruction retrieval device including a self-expandable member having a proximal end portion, a main body portion and a distal end portion. Each of the self-expandable portions consists of a plurality of cell structures formed by intersecting strut members. At least one proximal cell structure in the proximal end portion has one or more struts that have a width and/or thickness greater than the width and/or thickness of the majority of strut members in the main body and distal end portions of the expandable member. Attached to at least one of the proximal-most cell structures in the proximal end portion is a proximally extending flexible wire having sufficient length and flexibility to navigate the tortuous vasculature and access the embolic obstruction. In one implementation, the embolic obstruction retrieval device is delivered to the embolic obstruction through the lumen of a delivery catheter.

Claims

1. An embolic obstruction retrieval device comprising:

an elongate self-expandable member expandable from a first delivery position to a second placement position, in the first delivery position the expandable member being in an unexpanded position and having a nominal first diameter and in the second position the expandable member being in a radially expanded position and having a second nominal diameter greater than the first nominal diameter, the expandable member comprising a plurality of generally longitudinal undulating elements with adjacent undulating elements being interconnected in a manner to form a plurality of diagonally disposed cell structures, the expandable member having a proximal end portion with a first length and an elongate cylindrical main body portion with a second length, the elongate cylindrical main body portion located distal to the proximal end portion, the elongate cylindrical main body portion comprising at least a first circumferential row of cell structures that extends diagonally and circumferentially around a longitudinal axis of the expandable member, a second circumferential row of cell structures located distal to and interconnected with the first circumferential row of cell structures that extends diagonally and circumferentially around the longitudinal axis of the expandable member, a third circumferential row of cell structures located distal to and interconnected with the second circumferential row of cell structures that extends diagonally and circumferentially around the longitudinal axis of the expandable member, a fourth circumferential row of cell structures located distal to and interconnected with the third circumferential row of cell structures that extends diagonally and circumferentially around the longitudinal axis of the expandable member, the proximal end portion comprising multiple rows of cell structures with none of the multiple rows of cell structures extending circumferentially around the longitudinal axis of the expandable member, the second length of the elongate cylindrical main body portion being between 2.5 and 3.5 times greater than the first length of the proximal end portion, the outer-most cell structures in the proximal end portion having proximal-most wall segments that form first and second rail segments that each extend from a position at or near a proximal-most end of the expandable member to a position at or near a proximal end of the cylindrical main body portion, when the expandable member is cut and laid flat on a surface at least the first rail segment is substantially straight; and

a first proximally extending elongate flexible wire connected to the proximal-most end of the expandable member.

2. The embolic obstruction retrieval device of claim 1, wherein the first and second rail segments are of the same length.

3. The embolic obstruction retrieval device of claim 1, wherein in the radially expanded position the cylindrical main body portion comprises a first region and a second region, the second region having a diameter greater than the first region.

4. The embolic obstruction retrieval device of claim 3, wherein the diameter of the second region is between about 25.0 to about 35.0 percent greater than the diameter of the first region.

5. The embolic obstruction retrieval device of claim 3, wherein the second region is located distal to the first region.

6. The embolic obstruction retrieval device of claim 3, wherein the second region is located at a distal end of the cylindrical main body portion.

7. The embolic obstruction retrieval device of claim 1, wherein at least a portion of the expandable member is coated with a radiopaque material.

8. The embolic obstruction retrieval device of claim 1, further comprising radiopaque markers positioned at or near the proximal-most and distal-most ends of the expandable member.

9. The embolic obstruction retrieval device of claim 1, wherein each of the cell structures in the proximal end portion are larger than the cell structures in the elongate cylindrical main body portion.