Aneurysm device and delivery method
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.
1. A method of delivering an occlusive device to an aneurysm in a blood vessel in a patient, comprising:
slidably positioning a delivery tube within a microcatheter;
slidably positioning a braid with the delivery tube, the braid being in a collapsed state and comprising a distal end and a proximal end;
selectively positioning the microcatheter, the delivery tube, and the braid into vasculature of the aneurysm;
distally sliding the braid, by the delivery tube, from the microcatheter towards the aneurysm;
causing a distal segment between the proximal and distal ends of the braid to move from the collapsed state within the microcatheter to a deployed stated defined by the distal segment radially expanding to form an occlusive sack as the distal end of the braid is moved distally from the microcatheter; then
inverting and buckling a proximal segment proximal the distal segment into the occlusive sack; and then
releasing the braid within the aneurysm and withdrawing the delivery tube and the microcatheter from the aneurysm.
2. The method of claim 1 , further comprising:
positioning wherein the distal segment across the aneurysm neck, wherein the distal segment comprises a higher braid angle relative to the occlusive sack.
3. The method of claim 2 , further comprising:
increasing a braid angle of one or more segments proximal the distal segment relative to a braid angle of the distal segment thereby facilitating inversion.
4. The method of claim 1 , wherein the distal end of the braid is opened.
5. The method of claim 1 , further comprising:
positioning a tapered segment between the distal segment and the proximal segment; and
sealing, by the occlusive sack, the neck of the aneurysm.
6. The method of claim 5 , further comprising:
diverting flow, by the tapered segment, as the distal segment forms the occlusive sack adjacent to, or is against, a wall of the aneurysm.
7. The method of claim 1 , wherein the occlusive sack of the distal segment is a collapsible cage-like vaso-occlusive structure.
8. The method of claim 1 , wherein the distal segment comprises fewer wire segments than the tapered and proximal segments.