Aneurysm device and delivery system

Abstract

The present disclosure relates to a self-expanding braid for treating an aneurysm. The braid can include a lumen with a proximal end opposite a distal end. Translating the braid can cause a distal segment of the braid to expand and form an outer occlusive sack while a segment proximal the distal segment can invert into the outer occlusive sack like a tube sock. The braid can then be detached from its delivery system.

What is claimed is: 
     
         1 . An occlusive device for treating an aneurysm, comprising:
 a delivery system; and   a braid being slideably disposed within a microcatheter in a collapsed state, the braid having a distal end opposite a proximal end, the braid comprising a distal segment between the distal and proximal ends;   the braid configured to distally translate from within the microcatheter to a deployed state,   the braid configured to radially expand to the deployed state as the distal end of the braid exits the microcatheter thereby causing the distal segment to form an occlusive sack for the aneurysm disposed across the aneurysm neck,   the distal segment comprising a porosity that is reduced relative to the occlusive sack configured to thereby reduce flow velocity into the aneurysm; and   the braid being configured so that distally translating the proximal end of the braid a first distance from outside the aneurysm as the distal sack is forming inside the aneurysm causes the proximal end of the distal segment to invert then buckle inside the aneurysm so that the proximal end tucks one or more segments proximal of the distal segment into the occlusive sack.   
     
     
         2 . The device of  claim 1 , the braid further comprising:
 a tapered segment disposed between the distal segment and a proximal segment, the proximal segment being disposed on or adjacent the proximal end of the braid; and   a buckle portion between the distal segment and the tapered segment.   
     
     
         3 . The device of  claim 2 , the proximal end of the braid configured to be overlaid internal to the occlusive sack of the distal segment by being inverted and buckled at the buckle portion after the occlusive sack of the distal segment has formed by radially expanding. 
     
     
         4 . The device of  claim 1 , the distal segment comprises a higher braid angle relative to the occlusive sack. 
     
     
         5 . The device of  claim 1 , the one or more segments proximal the distal segment comprise an increased braid angle relative to a braid angle of the distal segment. 
     
     
         6 . The device of  claim 1 , the distal end of the braid being opened. 
     
     
         7 . The device of  claim 1 , the distal segment of the occlusive sack being empty of filling material. 
     
     
         8 . The device of  claim 1 , the braid being detachable from the delivery system in the aneurysm, the delivery system comprising:
 a delivery tube comprising a distal end and a proximal end, the distal end of the delivery tube being detachably connected to the proximal end of the braid, the delivery tube being translatably disposable within a microcatheter;   the delivery tube configured to distally translate the braid within the microcatheter from the collapsed state to the deployed state.   
     
     
         9 . The device of  claim 8 , the braid further comprising:
 a tapered segment disposed between the distal segment and a proximal segment, the proximal segment being disposed on or adjacent the proximal end of the braid;   the occlusive sack of the distal segment being spherical and capable of sealing the neck of the aneurysm.   
     
     
         10 . The device of  claim 9 , the distal segment configured to expand to form the occlusive sack as the distal end of the braid is distally translated away from the delivery tube. 
     
     
         11 . The device of  claim 9 , the proximal segment attaches the braid to the distal end of the delivery tube and, after the distal segment has expanded to form the occlusive sack, the proximal segment is further configured to initiate inversion and buckling of the proximal end of the braid overlaid into the occlusive sack of the distal segment. 
     
     
         12 . The device of  claim 9 , wherein the occlusive sack of the distal segment is a collapsible cage-like vaso-occlusive structure. 
     
     
         13 . The device of  claim 9 , wherein the distal segment comprises fewer wire segments than the tapered and proximal segments. 
     
     
         14 . The device of  claim 9 , the tapered segment configured to divert flow as the distal segment forms the occlusive sack adjacent or is against a wall of the aneurysm and the proximal segment inverts and buckles into the distal segment at the neck of the aneurysm. 
     
     
         15 . A braid capable of moving from a collapsed state within a microcatheter to a deployed state distal to the microcatheter, comprising:
 a proximal segment on or adjacent a proximal end;   a distal segment on or adjacent a distal end; and   a tapered segment between the distal segment and the proximal segment;   the braid configured so that when the distal end is distal of the microcatheter the distal segment is configured to radially expand and form an outer occlusive sack disposed across the aneurysm neck, the distal segment comprising a porosity that is reduced relative to the occlusive sack and configured to induce a flow diverting effect into the aneurysm, the occlusive sack having a diameter greater than the microcatheter;   the braid being configured so that distally translating the proximal end of the braid a first distance from outside the aneurysm as the distal sack is forming inside the aneurysm causes the proximal end of the distal segment to invert then buckle inside the aneurysm so that the proximal end tucks one or more segments proximal of the distal segment into the occlusive sack.   
     
     
         16 . The braid of  claim 15 , the braid further comprising a buckle portion between the distal segment and the tapered segment, the buckle portion causing the proximal end of the braid to buckle into the occlusive sack 
     
     
         17 . The braid of  claim 15 , the braid further comprising a buckle portion between the distal segment and the proximal segment, the buckle portion causing the proximal end of the braid to buckle into the occlusive sack. 
     
     
         18 . The braid of  claim 15 , a braid angle of the tapered segment being reduced compared to a braid angle of the distal segment.