Vascular stent with adjustable radial strength

1 . An intravascular device comprising:

an outer stent and an inner stent that is at least partially disposed in a lumen of the outer stent, wherein the lumen is configured to have:

a first configuration during deployment, wherein the first configuration has a first radial strength; and

a second configuration after the deployment, wherein the second configuration has a second radial strength and the inner stent is fused, at a plurality of fusion points, to the lumen of the outer stent by applying energy to the intravascular device, the fusion fixing a selected diameter of the intravascular device in the second configuration after the deployment,

wherein the energy is selected from an electric current, a heat, and an ultrasonic energy; and

wherein the selected diameter is adjusted in-situ, and wherein the first radial strength is less than the second radial strength.

2 . The intravascular device of claim 1 , wherein the intravascular device is configured for insertion within an intracranial vessel.

3 . The intravascular device of claim 1 , further comprising:

a wire configured to extend through the lumen and expand or contract the outer stent responsive to manipulation of the wire;

a proximal hub slidably coupled to a proximal region of the wire; and

a distal hub coupled to a distal region of the wire;

wherein:

the inner stent comprises a plurality of tethers configured to extend from an input device to the proximal hub and to a proximal end of the outer stent,

the plurality of tethers is further configured to extend through the lumen and couple a distal end of the outer stent to the distal hub, and

at least a portion of the plurality of tethers has electrical conductivity;

application of an electric current to the at least a portion of the plurality of tethers is configured to:

disengage the plurality of tethers from the proximal end and the distal end of the outer stent, respectively, for removal of the wire, and

fuse a luminal segment of the plurality of tethers, extending through the lumen of the outer stent, to the lumen of the outer stent.

4 . The intravascular device of claim 1 , wherein the outer stent comprises a polymer.

5 . The intravascular device of claim 3 , wherein each of the plurality of tethers comprises a braided wire.

6 . The intravascular device of claim 3 , wherein the plurality of tethers each comprise a plurality of segments.

7 . The intravascular device of claim 6 , wherein a coiled segment of the plurality of tethers is configured to extend from the input device to the proximal hub.

8 . The intravascular device of claim 7 , wherein a proximal segment of each of the plurality of tethers is configured to extend from the proximal hub to the proximal end of the outer stent.

9 . The intravascular device of claim 8 , wherein the proximal hub is configured to slide along the wire relative to the distal hub to expand or contract the outer stent.

10 . The intravascular device of claim 8 , wherein the coiled segment and the proximal segment are electrically conductive, such that the application of the electric current is configured to disengage the plurality of tethers from the proximal end of the outer stent.

11 . The intravascular device of claim 6 , wherein the plurality of tethers is substantially parallel to each other in the luminal segment.

12 . The intravascular device of claim 6 , wherein a distal segment of each of the plurality of tethers is configured to extend from the distal end of the outer stent to the distal hub.

13 . The intravascular device of claim 12 , wherein the distal segment is electrically conductive, such that the application of the electric current is configured to disengage the plurality of tethers from the distal end of the outer stent.

14 . The intravascular device of claim 3 , wherein the luminal segment of the plurality of tethers comprises a plurality of fusion contacts configured to fuse the luminal segment of the plurality of tethers to the lumen of the outer stent upon application of the electric current.

15 . The intravascular device of claim 3 , wherein the luminal segment of the plurality of tethers comprises uninsulated material.

16 . The intravascular device of claim 3 , further comprising the input device coupled to a proximal end of the plurality of tethers.

17 . An intravascular device comprising:

an outer stent; and

an inner stent that is at least partially disposed in a lumen of the outer stent,

wherein the outer stent and the inner stent are configured to have:

a first configuration during deployment, wherein the first configuration has a first radial strength; and

a second configuration after the deployment, wherein the second configuration has a second radial strength and wherein the inner stent is fused to the lumen of the outer stent by applying energy to the intravascular device, the fusion fixing a deployed selected diameter of the intravascular device in the second configuration after the deployment,

wherein the energy is selected from an electric current, a heat, and an ultrasonic energy, and wherein the first radial strength is less than the second radial strength.

18 . The intravascular device of claim 17 , wherein the selected diameter may be adjusted before the fusion.

19 . The intravascular device of claim 18 , wherein the energy comprises the electric current, and wherein the fusion comprises applying the electric current to the inner stent to fuse at least a portion of the inner stent to the outer stent at a plurality of fusion points along the lumen.

20 . The intravascular device of claim 17 , wherein the energy comprises the electric current, and wherein the fusion comprises applying the electric current to the inner stent to fuse at least a portion of the inner stent to the outer stent at a plurality of fusion points along the lumen and disengages the inner stent from a translatable wire configured to couple to the inner stent.