Methods and apparatus for luminal stenting
Described herein are flexible implantable occluding devices that can, for example, navigate the tortuous vessels of the neurovasculature. The occluding devices can also conform to the shape of the tortuous vessels of the vasculature. In some embodiments, the occluding devices can direct blood flow within a vessel away from an aneurysm or limit blood flow to the aneurysm. Some embodiments describe methods and apparatus for adjusting, along a length of the device, the porosity of the occluding device. In some embodiments, the occluding devices allows adequate blood flow to be provided to adjacent structures such that those structures, whether they are branch vessels or oxygen-demanding tissues, are not deprived of the necessary blood flow.
1. A method, of implanting a stent in a patient's vessel, comprising:
expanding a first portion of a stent against a vessel wall;
expanding a second portion of the stent, proximal to the first portion; and
after expanding the first portion and the second portion, while the first portion maintains a substantially similar cross-sectional dimension, and while movement of the first portion is impeded by a frictional force applied to the first portion by the wall, applying an axial force to change a first porosity of the second portion to a second porosity, less than the first porosity.
2. The method of claim 1 , wherein, after changing the first porosity, a proximal portion of the stent and the first portion of the stent have a porosity greater than the second porosity.
3. The method of claim 1 , wherein the second portion is located at an aneurysm arising from the vessel.
4. The method of claim 1 , wherein the stent comprises woven strands.
5. The method of claim 1 , wherein the first porosity is changed by an elongate member.
6. The method of claim 1 , wherein the stent extends from a first location, proximal to the aneurysm, to a second location, distal to the aneurysm.
7. The method of claim 1 , wherein changing the first porosity comprises moving the second portion distally.
8. The method of claim 1 , wherein changing the first porosity decreases flow of blood into an aneurysm.
9. The method of claim 1 , wherein the axial force is an axially compressive force.
10. The method of claim 1 , wherein the second portion is located at a branch vessel arising from the vessel.
11. The method of claim 1 , wherein changing the first porosity comprises moving the second portion proximally.
12. The method of claim 1 , wherein changing the first porosity increases flow of blood into a branch vessel.
13. The method of claim 1 , wherein the axial force is an axially expansive force.
14. The method of claim 1 , further comprising:
while movement of a third portion of the stent is impeded by a frictional force applied to the third portion by the wall, changing a third porosity of a fourth portion of the stent to a fourth porosity, different than the third porosity.
15. The method of claim 14 , wherein the changing the third porosity comprises applying an axially compressive force.
16. The method of claim 14 , wherein the changing the third porosity comprises applying an axially expansive force.
17. The method of claim 1 , wherein applying the axial force comprises applying an axial force to a proximal portion of the stent.
18. The method of claim 1 , wherein, prior to expansion, the first portion and the second portion have substantially the same porosity.
19. The method of claim 1 , wherein the axial force is applied to change the first porosity of the second portion to a second porosity while the second portion maintains a substantially similar cross-sectional dimension.