Occlusive devices
A system for treatment of an aneurysm includes an intrasaccular device that can be delivered using a catheter. The device can include at least one expandable structure adapted to transition from a compressed configuration to an expanded configuration when released into the aneurysm. The expandable structure can have a specific shape or porosity. Multiple expandable structures can also be used, in which case each of the expandable structures can have a unique shape or porosity profile. The morphology of the aneurysm and orientation of any connecting arteries can determine the type, size, shape, number, and porosity profile of the expandable structure used in treating the aneurysm.
1. A method for treatment of an aneurysm, comprising:
positioning a distal opening of a catheter adjacent to the aneurysm, the catheter containing a framing device comprising a braided structure having a compressed state for delivery through the catheter to the aneurysm and an expanded state, the braided structure being shape set such that it forms a preset shape in the expanded state that has an interior cavity and an exterior surface for contacting a wall of the aneurysm;
releasing the framing device from the catheter such that the braided structure self-expands to its preset shape and the exterior surface of the braided structure contacts a distal portion of the aneurysm wall; and
after self-expansion of the braided structure, releasing at least one expandable component comprising foam into the interior cavity of the braided structure and thereby further expanding the framing device such that a distal portion of the framing device conforms at least partially to a shape of at least the distal portion of the aneurysm wall.
2. The method of claim 1 , wherein the braided structure comprises a substantially closed three-dimensional expanded shape.
3. The method of claim 2 , wherein the three-dimensional shape is selected from the group consisting of spheres, cylinders, hemispheres, polyhedrons, prolate spheroids, oblate spheroids, non-spherical surface of revolution, and combinations thereof.
4. The method of claim 1 , wherein the expandable component further comprises a braided structure.
5. The method of claim 1 , wherein the device comprises four quadrants, and the releasing comprises causing at least a portion of each quadrant to contact the aneurysm wall.
6. The method of claim 5 , wherein the device comprises a substantially spherical expanded shape.
7. The method of claim 1 , wherein:
the braided structure comprises an opening to the interior cavity, and
releasing the at least one expandable component further comprises injecting the at least one expandable component comprising foam into the device cavity through the opening.
8. The method of claim 7 , wherein the braided structure is formed of a plurality of braided filaments, and the opening is defined by an aperture formed between the filaments of the braided structure.
9. The method of claim 7 , wherein the braided structure has a closed end and an open end opposite the closed end, wherein the open end defines the opening, and wherein advancing the framing device comprises aligning the opening with a neck of the aneurysm.
10. The method of claim 1 , wherein:
the braided structure is formed of a plurality of braided filaments and has an opening to the interior cavity formed between the filaments, and wherein releasing the at least one expandable component comprises injecting the at least one expandable component comprising foam into the interior cavity through the opening.
11. The method of claim 1 , wherein the braided structure is formed of a plurality of braided filaments made of stainless steel and/or nitinol cobalt chromium.
12. A method for treatment of an aneurysm, comprising:
positioning a distal opening of a catheter adjacent to the aneurysm, the catheter containing a framing device comprising a braided structure having a compressed state for delivery through the catheter to the aneurysm and an expanded state, the braided structure being shape set such that it forms a preset shape in the expanded state that has an interior cavity and an exterior surface for contacting a wall of the aneurysm;
releasing the framing device from the catheter such that the braided structure self-expands to its preset shape such that at least a portion of the exterior surface of the braided structure contacts a distal portion of the aneurysm wall; and
after self-expansion of the braided structure, releasing at least one expandable component comprising a liquid embolic into the interior cavity of the braided structure and thereby further expanding the braided structure such that a distal portion of the braided structure conforms at least partially to a shape of at least the distal portion of the aneurysm wall.
13. The method of claim 12 , wherein the braided structure comprises a substantially closed three-dimensional expanded shape.
14. The method of claim 13 , wherein the three-dimensional shape is selected from the group consisting of spheres, prolate spheroids, oblate spheroids, and combinations thereof.
15. The method of claim 12 , wherein:
the braided structure comprises an opening to the interior cavity, and
releasing the at least one expandable component further comprises injecting the at least one expandable component into the interior cavity through the opening.
16. The method of claim 15 , wherein the braided structure is formed of a plurality of braided filaments, and the opening is defined by an aperture formed between the filaments of the braided structure.
17. The method of claim 15 , wherein the braided structure has a closed end and an open end opposite the closed end, wherein the open end defines the opening, and wherein advancing the framing device comprises aligning the opening with a neck of the aneurysm.
18. The method of claim 12 , wherein:
the braided structure is formed of a plurality of braided filaments and has an opening to the interior cavity formed between the filaments, and wherein releasing the at least one expandable component comprises injecting the at least one expandable component into the interior cavity through the opening.
19. The method of claim 12 , wherein the braided structure is formed of a plurality of braided filaments made of stainless steel and/or nitinol cobalt chromium.