VASO-OCCLUSIVE DEVICES INCLUDING A FRICTION ELEMENT AND METHODS OF USE

摘要

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.

主权项

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 and a diameter; anda plurality of distally-open, adjacently arranged outer braided tubular members that are distally pushable out of the delivery catheter, wherein a proximal end of each of the outer braided tubular members is fixed to the elongate inner member but a distal end of each of the outer braided tubular members is not attached to the elongate inner member, further wherein each of the outer braided tubular members has a length that is greater than 5 cm and less than the length, when deployed, of the elongate inner member, and wherein each of the outer braided tubular members has a collapsed configuration when held within the delivery catheter, and expands to an expanded configuration having a diameter of greater than 1.5 times the diameter of the inner member at a distal end of each of the outer braided tubular members when released from the delivery cannula, further wherein each of the outer braided tubular members is formed from about 24 to 36 strands of Nitinol, and each of the outer braided tubular members has a braid angle of 35 degrees or less in the collapsed configuration within the delivery catheter.