Two-way shape memory vascular treatment methods
Vascular treatment and methods include a plurality of self-expanding bulbs and a hypotube including interspersed patterns of longitudinally spaced rows of kerfs. Joints between woven structures and hypotubes include solder. Woven structures include patterns of radiopaque filaments measurable under x-ray. Structures are heat treated to include at least shapes at different temperatures. A catheter includes a hypotube including interspersed patterns of longitudinally spaced rows of kerfs. Heat treating systems include a detachable flange. Laser cutting systems include a fluid flow system.
1. A method of treating a thrombus in a vessel, the method comprising:
advancing a microcatheter in the vessel comprising crossing a distal end of the thrombus with a distal end of the microcatheter;
after advancing the microcatheter, inserting a thrombectomy device in a radially compressed state into the microcatheter, the thrombectomy device comprising a plurality of wires woven to form a textile fabric comprising:
a first shape upon advancing out of the microcatheter, and
a second shape upon exposure to a temperature between about 10° C. and about 18° C., the second shape different than the first shape;
after inserting the thrombectomy device into the microcatheter, advancing the thrombectomy device in the vessel and through the microcatheter proximate to the distal end of the microcatheter;
after advancing the thrombectomy device, maintaining a location of a proximal portion of the thrombectomy device while proximally retracting the microcatheter, wherein upon advancing out the microcatheter the textile fabric changes from the radially compressed shape to the first shape;
after retracting the microcatheter, injecting fluid to expose the textile fabric to the temperature, wherein, upon exposure to the temperature, the textile fabric changes from the first shape to the second shape;
while the textile structure is in the second shape, torsionally rasping the thrombectomy device; and
after torsionally rasping the thrombectomy device, retracting at a similar rate the microcatheter and the proximal portion of the thrombectomy device.
2. The method of claim 1 , wherein the first shape comprises a plurality of bulbs and the second shape comprises a spiral.
3. The method of claim 1 , wherein the textile fabric comprises a third shape upon exposure to a second temperature higher than the temperature, the third shape different than the first shape and the second shape.
4. The method of claim 3 , wherein the first shape comprises an expanded cylinder, the second shape comprises a spiral, and the third shape comprises a plurality of bulbs.
5. The method of claim 3 , wherein the second temperature is about 37° C.
6. The method of claim 1 , wherein torsionally rasping the thrombectomy device comprises at least one of removing portions of the thrombus attached to an endothelium wall, entrapping the thrombus in the radially expanded distal portion of the thrombectomy device, and collecting emboli in the radially expanded distal portion of the thrombectomy device.
7. The method of claim 1 , wherein the vessel comprises a blood vessel in a brain or a blood vessel in a leg.
8. A method of treating a thrombus in a vessel, the method comprising:
advancing a thrombectomy device in a radially compressed state in the vessel and through a microcatheter until the thrombectomy device is proximate to a distal end of the microcatheter and a distal end of the thrombus, the thrombectomy device comprising a plurality of wires woven to form a textile fabric comprising:
a first shape upon advancing out of the microcatheter,
a second shape upon exposure to a temperature, the second shape different than the first shape, and
a third shape upon exposure to a second temperature different than the temperature, the third shape different than the first shape and the second shape;
after advancing the thrombectomy device, maintaining a location of a proximal portion of the thrombectomy device while proximally retracting the microcatheter, wherein upon being unsheathed from the microcatheter the textile fabric changes from the radially compressed shape to the first shape and wherein upon being exposed to the temperature the textile fabric changes from the first shape to the second shape;
entrapping the thrombus in the textile fabric in the second shape;
exposing the textile fabric to the second temperature, wherein upon being exposed to the second temperature the textile fabric changes from the second shape to the third shape; and
entrapping the thrombus in the textile fabric in the third shape.
9. The method of claim 8 , wherein the first shape comprises a cylinder and the second shape comprises a plurality of bulbs.
10. The method of claim 9 , wherein the second shape comprises at least two of the plurality of bulbs having different outer diameters, different shapes, or different outer diameters and different shapes.
11. The method of claim 9 , wherein the second shape is tapered.
12. The method of claim 9 , wherein the second shape comprises at least two of the plurality of bulbs separated by a neck.
13. The method of claim 8 , wherein the first shape comprises a cylinder and the second shape comprises a spiral.
14. The method of claim 8 , wherein entrapping the thrombus comprises torsionally rasping the thrombectomy device.
15. The method of claim 8 , wherein the vessel comprises a blood vessel in a brain or a blood vessel in a leg.
16. A method of treating a vessel, the method comprising:
providing a device configured to be advanced in a vessel and through a microcatheter in a radially compressed state, the device comprising:
a first shape in the radially compressed state in the microcatheter,
a second shape upon expansion of the device out of the microcatheter,
a third shape upon exposure to a first temperature, the third shape different than the first shape and the second shape, and
a fourth shape upon exposure to a second temperature higher than the first temperature, the fourth shape different than the first shape, the second shape, and the third shape;
wherein the shapes of the device facilitate treatment of the vessel.
17. The method of claim 16 , wherein the device comprises a textile structure.
18. The method of claim 16 , wherein the device comprises a laser cut structure.
19. The method of claim 16 , wherein at least one of the third shape and the fourth shape is non-cylindrical.