Vaso-occlusive devices and methods of use
Vaso-occlusive apparatuses, including implants, and methods of using them to treat aneurysms. For example, described herein are expandable vaso-occlusive implants that 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. In particular, the expandable implants described herein are configured to allow relatively soft and elongate implants to be pushed out of a cannula without binding up within the cannula.
1. A vaso-occlusion system for occluding an aneurysm, the system comprising:
a delivery catheter;
a vaso-occlusive device adapted to be pushed out of, and retrieved back into, a distal end opening of the delivery catheter, the vaso-occlusive device comprising a braided tubular member having a longitudinal axis, the braided tubular member having a collapsed configuration having a collapsed diameter when compressed by and within the delivery catheter, and self-expandable to an expanded diameter greater than the collapsed diameter in a deployed configuration when released from the delivery catheter,
wherein the braided tubular member is formed of about 24 to 36 strands,
wherein braid angles formed between crossing strands of the braided tubular member in a direction of the longitudinal axis are about 35 degrees or less when the braided tubular member is held in a collapsed configuration within the delivery catheter,
wherein the braided tubular member has a non-circular transverse shape in the deployed configuration when released from the delivery catheter; and
a friction element configured (1) to frictionally couple the braided tubular member to a pusher member when the braided tubular member is in the collapsed configuration, said frictional coupling caused by compression within the delivery catheter within the delivery catheter, and (2) to frictionally release the braided tubular member from the pusher member when the braided tubular member self-expands to the expanded diameter in the deployed configuration when released from the delivery catheter.
2. The vaso-occlusion system of claim 1 , wherein the braided tubular member has a width of between 0.75 mm and 3.0 mm when in the deployed configuration.
3. The vaso-occlusion system of claim 1 , wherein the strands comprise wires made out of composite materials.
4. The vaso-occlusion system of claim 3 , wherein the composite materials include Nitinol and one or more of cobalt-chromium ahoy, platinum, platinum ally, and a polymer.
5. The vaso-occlusion system of claim 1 , wherein braid angles formed between crossing strands of the braided tubular member in the direction of the longitudinal axis are about 35 to 90 degrees when the braided tubular member is in the deployed configuration.
6. The vaso-occlusion system of claim 5 , wherein braid angles formed between crossing strands of the braided tubular member in the direction of the longitudinal axis are less than about 50 degrees when the braided tubular member is in the deployed configuration.
7. The vaso-occlusion system of claim 1 , wherein a pore size formed between strands of the braided tubular member are less than about 0.1 square mm when the braided tubular member is in the deployed configuration.
8. The vaso-occlusive system of claim 1 , wherein the braided tubular member has a length that is greater than 5 cm when in the deployed configuration.
9. The vaso-occlusion system of claim 1 , wherein an elongate length of the vaso-occlusive device has a pre-set curve or shape when the braided tubular member is in the deployed configuration.
10. The vaso-occlusive system of claim 1 , further comprising:
the pushing member, and
wherein the friction element comprises a cylindrical body attached to, and annularly disposed around, the pusher member along a short portion of the pusher member, the friction element having a larger diameter than a diameter of the pusher member, and the cylindrical body disposed within the braided tubular member.
11. The vaso-occlusive system of claim 10 , wherein the friction element is formed of a polymer material having a high friction when contacting the tubular braided member.
12. The vaso-occlusive system of claim 1 , further comprising:
the pushing member, and
wherein the friction element comprises an expandable flare attached to the pusher member, the flare having a plurality of prongs extending radially outward from the pusher member, and the flare disposed within the braided tubular member.
13. The vaso-occlusive system of claim 12 , wherein the flare comprises a plurality of braided wires in which an end of each wire forms one of the prongs.
14. The vaso-occlusive system of claim 1 , further comprising:
the pushing member, and
wherein the friction element comprises a flexible basket annularly disposed around the pusher member, the flexible basket disposed within the braided tubular member.
15. The vaso-occlusive system of claim 1 , further comprising:
the pushing member, and wherein the friction element comprises a longitudinally separate region of the pushing member having an expanded diameter larger than a primary diameter of the pushing member.
16. The vaso-occlusive system of claim 1 , wherein the friction element is coupled to the tubular braided member within an inside of the tubular braided member.
17. The vaso-occlusive system of claim 16 , wherein the friction element is movable relative to the tubular braided member.
18. The vaso-occlusive system of claim 1 , comprising a plurality of friction elements, and wherein each friction element is coupled to the tubular braided member within an inside of the tubular braided member.
19. The vaso-occlusive system of claim 18 , wherein the friction elements are positioned at longitudinally spaced locations along the tubular braided member.
20. The vaso-occlusive system of claim 19 , wherein the friction elements are arranged in a spiral pattern along the tubular braided member.
21. The vaso-occlusive system of claim 18 , wherein the friction elements are arranged circumferentially around discrete longitudinally spaced locations.
22. The vaso-occlusive system of claim 18 , wherein each friction element comprises one of an annular ring, a C-shaped element and a U-shaped element.
23. A vaso-occlusive device, comprising:
a braided tubular member having a longitudinal axis, the braided tubular member having a collapsed configuration having a collapsed diameter when compressed by and within a delivery catheter and self-expandable to an expanded diameter greater than the collapsed diameter in a deployed configuration when released from the delivery catheter,
wherein the braided tubular member is formed of about 24 to 36 strands,
wherein braid angles formed between crossing strands of the braided tubular member in a direction of the longitudinal axis are about 35 degrees or less when the braided tubular member is held in a collapsed configuration within a delivery catheter,
wherein the braided tubular member has a non-circular transverse shape in the deployed configuration when released from the delivery catheter,
wherein the braided tubular member has a width between 0.75 mm and 3.0 mm when in the deployed configuration, and
a friction element configured (1) to frictionally couple the braided tubular member to a pusher member when the braided tubular member is in the collapsed configuration, said frictional coupling caused by compression within the delivery catheter within the delivery catheter, and (2) to frictionally release the braided tubular member from the pusher member when the braided tubular member self-expands to the expanded diameter in the deployed configuration when released from the delivery catheter.
24. The vaso-occlusive device of claim 23 , wherein the strands comprise wires made out of composite materials.
25. The vaso-occlusive device of claim 24 , wherein the composite materials include Nitinol and one or more of cobalt-chromium alloy, platinum, platinum ally, and a polymer.
26. The vaso-occlusive device of claim 23 , wherein braid angles formed between crossing strands of the braided tubular member in the direction of the longitudinal axis are about 35 to 90 degrees when the braided tubular member is in the deployed configuration.
27. The vaso-occlusive device of claim 26 , wherein braid angles formed between crossing strands of the braided tubular member in the direction of the longitudinal axis are less than about 50 degrees when the braided tubular member is in the deployed configuration.
28. The vaso-occlusive device of claim 23 , wherein a pore size formed between strands of the braided tubular member are less than about 0.1 square mm when the braided tubular member is in the deployed configuration.
29. The vaso-occlusive device of claim 23 , wherein the braided tubular member has a length that is greater than 5 cm when in the deployed configuration.
30. A vaso-occlusive device, comprising:
a braided tubular member having a longitudinal axis, the braided tubular member having a collapsed configuration having a collapsed diameter when compressed by and within a delivery catheter, and self-expandable to an expanded diameter greater than the collapsed diameter in a deployed configuration when released from the delivery catheter herein the braided tubular member is formed of about 24 to 36 strands comprising wires made out of composite materials,
wherein braid angles formed between crossing strands of the braided tubular member in a direction of the longitudinal axis are about 35 degrees or less when the braided tubular member is held in a collapsed configuration within a delivery catheter,
wherein the braided tubular member has a non-circular transverse shape in the deployed configuration when released from the delivery catheter, and
wherein braid angles formed between crossing strands of the braided tubular member in the direction of the longitudinal axis are about 35 to 90 degrees when the braided tubular member is in the deployed configuration, and
a friction element configured (1) to frictionally couple the braided tubular member to a pusher member when the braided tubular member is in the collapsed configuration within the delivery catheter, said frictional coupling caused by compression within the delivery catheter, and (2), to frictionally release the braided tubular member from the pusher member when the braided tubular member self-expands to the expanded diameter in the deployed configuration when released from the delivery catheter.
31. The vaso-occlusive device of claim 30 , wherein the composite materials include Nitinol and one or more of cobalt-chromium alloy, platinum, platinum ally, and a polymer.
32. The vaso-occlusive device of claim 30 , wherein braid angles formed between crossing strands of the braided tubular member in the direction of the longitudinal axis are less than about 50 degrees when the braided tubular member is in the deployed configuration.
33. The vaso-occlusive device of claim 30 , wherein the braided tubular member has a width between 0.75 mm and 3.0 mm when in the deployed configuration.