Vaso-occlusive devices including a friction element and methods of use

• US 9,011,482 B2
• Filed: 05/28/2014
• Issued: 04/21/2015
• Est. Priority Date: 02/09/2012
• Status: Active Grant

• Current Assignee: Stryker European Operations Holdings, LLC (Stryker Corporation)
• Original Assignee: Tw Medical Technologies, LLC
• Inventors: Wallace, Michael P., Greenhalgh, E. Skott
• Primary Examiner(s): ANDERSON, GREGORY A
• Application Number:
  US14/289,567
• Publication Number:
  US 20140277099A1
• Time in Patent Office: 328 Days
• Field of Search: 606/151, 606/191, 606/200
• US Class Current: 606/200
• CPC Class Codes: A61B 17/12031 complete occlusion
• CPC Class Codes: A61B 17/12113 within an aneurysm
• CPC Class Codes: A61B 17/1214 Coils or wires
• CPC Class Codes: A61B 17/1215 comprising additional materials, e.g. thrombogenic, having filaments, having fibers, being coated
• CPC Class Codes: A61B 17/12163 having a string of elements connected to each other
• CPC Class Codes: A61B 17/12168 having a mesh structure A61B17/1214 takes precedence
• CPC Class Codes: A61B 2017/00004 (bio)absorbable, (bio)resorbable, resorptive for implantable prostheses A61F2210/0004
• CPC Class Codes: A61B 2017/00367 Details of actuation of instruments, e.g. relations between pushing buttons, or the like, and activation of the tool, working tip, or the like
• CPC Class Codes: A61B 2017/00526 Methods of manufacturing
• CPC Class Codes: A61B 2017/00884 enhancing wound closure
• CPC Class Codes: A61B 2017/00893 pharmaceutically effective
• CPC Class Codes: A61B 2017/1205 Introduction devices
• CPC Class Codes: A61B 2017/12054 Details concerning the detachment of the occluding device from the introduction device
• CPC Class Codes: A61B 2017/12063 electrolytically detachable
• CPC Class Codes: A61B 2017/12068 detachable by heat
• CPC Class Codes: A61B 2017/12095 Threaded connection

Abstract

Vaso-occlusive apparatuses, including implants, and methods of using them to treat aneurysms. The vaso-occlusive implants described herein include one or more soft and expandable braided member coupled to a pushable member such as a coil that maybe inserted and retrieved from within an aneurism using a delivery catheter as well as a friction element between the soft braided member and the coil. The friction element allows the relatively soft and elongate implant to be pushed out of a cannula without binding up within the cannula.

Claims

1. A vaso-occlusion system for occluding an aneurysm, the system comprising:

a delivery catheter extending from a proximal end to a distal end; and

a vaso-occlusive device within the delivery catheter, wherein the vaso-occlusive device is adapted to be pushed out of, and retrieved back into, the distal end of the delivery catheter, the vaso-occlusive device comprising;

an elongate inner member having a length, wherein the length comprises a plurality of elongate regions having a first diameter separated by discrete regions having a second diameter that is greater than the first diameter but less than 1.5 times the first diameter, wherein the discrete regions form friction elements;

an outer braided tubular member, wherein the braided tubular member has a length that is less than the length when deployed of the elongate inner member and greater than 5 cm, and has a collapsed configuration when held within the delivery catheter, and expands to a diameter of greater than 1.5 times the first diameter of the inner member at a distal end of the outer braided tubular member when released from the delivery cannula; and

wherein the friction elements are positioned along the length of the inner member proximal to the distal end of the outer braided tubular member and distal to the proximal end of the outer braided tubular member, and are configured to press the braided tubular member against the catheter when the inner member is in the collapsed configuration within the delivery catheter so that the braided tubular member moves with the inner member when the vaso-occlusive device is pushed distally out of the delivery catheter.

2. The system of claim 1, wherein the elongate inner member comprises a helical coil having regions of different diameter.

3. The vaso-occlusion system of claim 1, wherein the braided tubular material is formed from a plurality of strands having a thickness that is less than about 0.0008 inches diameter.

4. The vaso-occlusion system of claim 1, wherein the catheter has an inner diameter of between about 0.015 inches and about 0.025 inches.

5. A vaso-occlusion system for occluding an aneurysm, the system comprising:

a delivery catheter extending from a proximal end to a distal end; and

a vaso-occlusive device within the delivery catheter, wherein the vaso-occlusive device is adapted to be pushed out of, and retrieved back into, the distal end of the delivery catheter, the vaso-occlusive device comprising;

an elongate inner member having a length and a diameter;

an outer braided tubular member, wherein the braided tubular member has a length that is less than the length of the elongate inner member when deployed and greater than 5 cm, and has a collapsed configuration when held within the delivery catheter, and expands to a diameter of greater than 1.5 times the diameter of the inner member at a distal end of the outer braided tubular member when released from the delivery cannula; and

a plurality of friction elements on the inner member at locations along the length of the inner member proximal to the distal end of the outer braided tubular member and distal to the proximal end of the outer braided tubular member, wherein the friction elements are configured to press the braided tubular member against the catheter when the inner member is in the collapsed configuration within the delivery catheter so that the braided tubular member moves with the inner member when the vaso-occlusive device is pushed distally out of the delivery catheter.

6. The vaso-occlusion system of claim 5, wherein the friction element is configured as a bump on the inner member having a diameter of greater than about 1.2×

the diameter of the inner member.

7. The vaso-occlusion system of claim 5, wherein the friction elements comprise annular elements.

8. The vaso-occlusion system of claim 5, wherein the braided tubular material is formed from a plurality of strands having a thickness that is less than about 0.0008 inches diameter.

9. The vaso-occlusion system of claim 5, wherein the braided tubular material is formed from a plurality of strands of Nitinol wire having a thickness that is between about 0.0004 inches and about 0.00075 inches.

10. The vaso-occlusion system of claim 5, wherein the braided tubular material is formed from a plurality of strands and wherein the braided tubular member has a pore size formed between strands in the expanded configuration of less than about 0.1 square mm.

11. The vaso-occlusion system of claim 5, wherein an elongate length of the vaso-occlusive device is configured to have a pre-set curve.

12. The vaso-occlusion system of claim 5, wherein the catheter has an inner diameter of between about 0.015 inches and about 0.025 inches.