Multiple layer filamenyary devices for treatment of vascular defects

Abstract

Braid-balls suitable for aneurysm occlusion and/or parent vessel occlusion/sacrifice (e.g., in treating neurovascular defects) are disclosed. Especially for aneurysm treatment, but also for either one of the aforementioned treatments, the form of the ball is very important. In particular, the density of the device is paramount in applications where braid itself is intended to moderate or stop blood flow—allowing thrombosis within a volume formed by the ball.

1 - 79 . (canceled) 
     
     
         80 . An embolic device comprising:
 a braid forming inner and outer layers and configured to compress for delivery through a catheter and expand upon release from the constraint of the catheter to define an open volume, wherein the inner and outer layers meet at a folded section that is closed to define a distal end of the device, and wherein the inner and outer layers further meet at a hub that closes and holds at least the outer braid layer at the proximal end of the device.   
     
     
         81 . The device of  claim 80  wherein portions of the device adjacent to the hub and to the folded section are rounded when fully expanded. 
     
     
         82 . The device of  claim 80  wherein the braid has a flared profile when expanded. 
     
     
         83 . The device of  claim 80  wherein the braid is ball-shaped when expanded. 
     
     
         84 . The device of  claim 80  wherein the inner and outer layers at the folded section together define a dome-shaped atraumatic surface when expanded. 
     
     
         85 . The device of  claim 80  wherein the inner braid layer is not held in the hub. 
     
     
         86 . The device of  claim 80  wherein both the inner and outer braid layers are held in the hub. 
     
     
         87 . The device of  claim 80  wherein the hub comprises an outer band and an inner band, wherein the braid is between the outer band and the inner band and the inner band defines a hub port configured to receive an elongated delivery member. 
     
     
         88 . The device of  claim 80  wherein the hub is radiopaque. 
     
     
         89 . The device of  claim 80  wherein the braid is one of a 64-wire braid, a 72-wire braid, a 96-wire braid, a 128-wire braid, or a 144-wire braid. 
     
     
         90 . The device of  claim 80  wherein the braid comprises a plurality of wires, and wherein at least some of the wires are platinum core Nitinol DFT or gold core Nitinol DFT. 
     
     
         91 . The device of  claim 80  wherein the braid comprises a plurality of wires, and wherein at least some of the wires are a superelastic alloy. 
     
     
         92 . An embolic device comprising:
 a mesh formed of an inverted tubular braid that has been heat set to form a predetermined, three-dimensional shape in an expanded configuration, the braid comprising a plurality of wires having first and second ends, wherein a distal end of the mesh has a folded section and defines a dome-shaped atraumatic surface when the mesh is expanded, and wherein the first and second ends of the braid are held together by a hub at a proximal end of the device.   
     
     
         93 . The device of  claim 92  wherein the three-dimensional shape is generally spherical. 
     
     
         94 . The device of  claim 92  wherein the hub comprises an outer band and an inner band, wherein the braid is between the outer band and the inner band and the inner band defines a hub port configured to receive an elongated delivery member. 
     
     
         95 . The device of  claim 92  wherein the hub is radiopaque. 
     
     
         96 . The device of  claim 92  wherein the braid is one of a 64-wire braid, a 72-wire braid, a 96-wire braid, a 128-wire braid, or a 144-wire braid. 
     
     
         97 . The device of  claim 92  wherein at least some of the wires of the braid are platinum core Nitinol DFT or gold core Nitinol DFT. 
     
     
         98 . The device of  claim 92  wherein at least some of the wires of the braid are a superelastic alloy. 
     
     
         99 . The device of  claim 92  wherein the mesh includes an inner braid layer and an outer braid layer, and wherein the inner braid layer and the outer braid layer are continuous at the folded section.