Systems and methods for delivery of stents and stent-like devices
Systems for treating an aneurysm in a cerebral vessel and methods of use are described. In one embodiment, the system includes an elongate tubular member having a lumen, an expandable stent, and a delivery device. The expandable stent has a constrained state that is configured for delivery through the lumen of the elongate tubular member, and an expanded state configured for placement within the cerebral vessel adjacent the aneurysm. The delivery device includes an elongate member and a self-expandable portion. The proximal end of the self-expandable portion is coupled to the elongate member at or near the distal end of the elongate member. The self-expandable portion of the delivery device includes a tubular mesh structure having a constrained state and an expanded state. The stent is engaged (e.g., mechanical, frictional, or intermeshing) with the self-expandable portion of the delivery device.
1. A system for treating an aneurysm in a cerebral vessel, comprising:
an elongate tubular member having a proximal end, a distal end, and a lumen therebetween having an inner diameter d;
an expandable stent having a proximal end, a distal end, and a lumen therebetween, the expandable stent having a constrained state with an outer diameter od 1 that is configured for delivery through the lumen of the elongate tubular member, and an expanded state having an inside diameter id 2 and an outer diameter od 2 , wherein the expanded state is configured for placement within the cerebral vessel adjacent the aneurysm, wherein od 2 is greater than od 1 , wherein the expandable stent comprises a tubular mesh structure formed of a plurality of filaments, wherein the plurality of filaments comprise a shape memory alloy, and wherein at least some of the plurality of filaments comprise drawn filled tubes, and
a delivery device comprising an elongate member having proximal and distal ends, and a self-expandable portion having outer and inner surfaces and proximal and distal ends, the proximal end of the self-expandable portion coupled to the elongate member at or near the distal end of the elongate member, the distal end of the self-expandable portion having a distal opening, wherein the self-expandable portion comprises a tubular mesh structure having a constrained state with an outer diameter OD 1 that is configured for delivery through the lumen of the elongate tubular member, and an expanded state having an outer diameter OD 2 ,
wherein the delivery device and stent are configured to exit the distal end of the elongate tubular member while the stent is engaged with an outer-most surface of the self-expandable portion of the delivery device.
2. The system of claim 1 , wherein the inside diameter id 2 of the expanded state of the stent is between about 2 mm and about 5 mm.
3. The system of claim 1 , wherein the inside diameter id 2 of the expanded state of the stent is substantially the same between the proximal and distal ends of the stent.
4. The system of claim 1 , wherein the stent comprises a tubular mesh.
5. The system of claim 1 , wherein the stent comprises a slotted tube having a plurality of struts.
6. The system of claim 1 , wherein at least part of the self-expandable portion of the delivery device is disposed within the lumen of the stent.
7. The system of claim 6 , wherein the at least part of the self-expandable portion mechanically engages at least a portion of the stent.
8. The system of claim 6 , wherein the at least part of the self-expandable portion frictionally engages at least a portion of the stent.
9. The system of claim 6 , wherein the at least part of the self-expandable portion mechanically engages at least a portion of the stent through intermeshing.
10. The system of claim 6 , wherein the at least part of the self-expandable portion mechanically engages the stent substantially from the proximal end to the distal end of the stent.
11. The system of claim 6 , wherein the at least part of the self-expandable portion frictionally engages the stent substantially from the proximal end to the distal end of the stent.
12. The system of claim 1 , wherein the tubular mesh structure of the self-expandable portion of the delivery device comprises a plurality of filaments.
13. The system of claim 12 , wherein the plurality of filaments of the tubular mesh structure of the self-expandable portion comprises a cobalt-chromium alloy.
14. The system of claim 12 , wherein the plurality of filaments of the tubular mesh structure of the self-expandable portion each have a diameter of between about 0.0010 inches and 0.0020 inches.
15. The system of claim 12 , wherein the plurality of filaments of the tubular mesh structure of the self-expandable portion are braided.
16. The system of claim 1 , wherein the stent is completely self-expanding.
17. The system of claim 1 , wherein the stent is partially self-expanding.
18. The system of claim 1 , wherein a braid angle of the stent is different than a braid angle of the self-expandable portion of the delivery device.
19. The system of claim 1 , wherein a braid angle of the stent is substantially similar to a braid angle of the self-expandable portion of the delivery device.
20. The system of claim 1 , wherein the drawn filled tubes comprise an outer shell of nickel-titanium and an inner core of platinum.