Vaso-occlusive devices and methods of use
View Patent ↗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 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 diameter;
a soft outer braided tubular member formed of about 24 to 36 strands comprising a Nitinol wire having a thickness that is 0.0010 inches or less in diameter, wherein the braided tubular member is attached and fixed to the inner member at a proximal end of the braided tubular member and extends in a longitudinal axis over the inner member but is not attached to the inner member at a distal end of the braided tubular member, further wherein the braided tubular member has a length that is greater than 5 cm, forms a braid angle between crossing strands in a direction of the longitudinal axis of about 35 degrees or less when held within the delivery catheter, and expands relative to the inner member to a diameter of greater than 1.5 times the diameter of the inner member when released from the delivery catheter.
2. The vaso-occlusion system of claim 1 , further comprising a pusher connected to the vaso-occlusive device.
3. The vaso-occlusion system of claim 1 , wherein the strands comprise a monofilament wire having a thickness that is less than about 0.0008 inches diameter.
4. The vaso-occlusion system of claim 1 , wherein the strands comprise a Nitinol wire having a thickness that is between about 0.0004 and 0.00075 inches diameter.
5. The vaso-occlusion system of claim 1 , wherein the inner member comprises a closed pitch coil.
6. The vaso-occlusion system of claim 1 , wherein the inner member comprises a platinum coil.
7. The vaso-occlusion system of claim 1 , wherein the braided tubular member comprises a braid angle of 30 degrees or less when held within the delivery catheter.
8. The vaso-occlusion system of claim 1 , further comprising a second outer braided tubular member that is attached to the inner member proximal to the outer braided/braided tubular member.
9. The vaso-occlusion system of claim 1 , wherein the braided tubular member is configured to have an expanded braid angle between about 35-90 degrees and a diameter between about 0.75 mm to about 3.0 mm.
10. The vaso-occlusion system of claim 1 , wherein the braided tubular member is configured to have an expanded braid angle less than about 50 degrees and a diameter between about 0.75 mm to about 3.0 mm.
11. The vaso-occlusion system of claim 1 , wherein the braided tubular member has a pore size formed between strands in the expanded configuration of less than about 0.1 square mm.
12. The vaso-occlusion system of claim 1 , wherein the braided tubular member is configured to have a pre-set transverse shape that is non-circular.
13. The vaso-occlusion system of claim 1 , wherein the braided tubular member is configured to have a pre-set to a 3D configuration.
14. The vaso-occlusion system of claim 1 , wherein an elongate length of the vaso-occlusive device is configured to have a pre-set curve or shape.
15. The vaso-occlusion system of claim 1 , wherein the proximal end of the braided tubular member is bound to the inner member by a polymeric junction or a metallic weld.
16. The vaso-occlusion system of claim 1 , wherein the braided tubular member has a length that is less than about 45 cm.
17. 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.
18. The vaso-occlusion system of claim 1 , wherein the catheter has an inner diameter of between about 0.015 inches and about 0.018 inches.
19. A vaso-occlusion device for occluding an aneurysm, wherein the vaso-occlusion device comprises a collapsed configuration that is pushable out of a delivery catheter and an expanded configuration, the vaso-occlusive device further comprising:
an elongate inner member having a diameter; and
a soft outer braided tubular member formed of about 24 to 36 strands comprising a Nitinol wire having a thickness that is 0.0010 inches or less in diameter, wherein the braided tubular member is attached and fixed to the inner member at a proximal end of the braided tubular member and extends in a longitudinal axis over the inner member but is not attached to the inner member at a distal end of the braided tubular member, further wherein the braided tubular member has a length that is greater than 5 cm, forms a braid angle between crossing strands in a direction of the longitudinal axis of about 35 degrees or less in the collapsed configuration within the delivery catheter, and expands relative to the inner member to a diameter of greater than 1.5 times the diameter of the inner member in the expanded configuration when released from the delivery catheter.
20. A method of occluding an aneurysm in a patient, the method comprising:
inserting a catheter into the patient, wherein the catheter houses a vaso-occlusive device in a collapsed configuration within a lumen of the catheter, and the vaso-occlusive device comprises an elongate inner member having a diameter and an outer braided tubular member formed of about 24 to 36 strands comprising a Nitinol wire having a thickness that is 0.0010 inches or less in diameter, wherein the braided tubular member is attached and fixed to the inner member at a proximal end of the braided tubular member and extends in a longitudinal axis over the inner member but is not attached at a distal end of the braided tubular member, further wherein the braided tubular member has a length that is greater than 5 cm, and the braided tubular member forms a braid angle between crossing strands in a direction of the longitudinal axis of about 35 degrees or less in the collapsed configuration within the catheter; and
pushing the vaso-occlusive device distally out of the catheter so that the braided tubular member expands relative to the inner member to a diameter of greater than 1.5 times the diameter of the inner member in an expanded configuration when released from the delivery cannula.
21. The method of claim 20 , further comprising detaching a distal length of the vaso-occlusive device from the proximal end of the vaso-occlusive device.
22. The method of claim 20 , further comprising retrieving at least a portion of the vaso-occlusive device that has been pushed out of the catheter back into the catheter by retracting the vaso-occlusive device proximally into the catheter.
23. The method of claim 20 , further comprising retrieving at least a portion of the vaso-occlusive device that has been pushed out of the catheter back into the catheter by retracting the vaso-occlusive device proximally into the catheter, and then again pushing the vaso-occlusive device distally out of the catheter.
24. The method of claim 20 , wherein the vaso-occlusive device is pre-biased in a curve so that it bends as it is pushed out of the catheter to assume three-dimensional shape.
25. The method of claim 20 , further comprising positioning a distal end region of the catheter adjacent an aneurysm in the body before pushing the vaso-occlusive device out of the catheter.
26. The method of claim 20 , further comprising limiting the flow of blood through the vaso-occlusive device when inserted into the patient after being pushed from the catheter by a small pore size formed between strands in the expanded configuration that are less than about 0.1 square mm.