Removable stent

1. An implant, the implant comprising:

an elongated tubular member comprising:

a first region having a proximal end region and a distal end region, the first region including a flared proximal stent frame tapering radially inward in a distal direction;

a second region having a proximal end region and a distal end region, the second region including a flexible sleeve extending distally from the distal end region of the first region;

a third region having a proximal end region and a distal end region, the third region including a distal stent frame having an outer diameter less than an outer diameter of the flared proximal stent frame adjacent the proximal end region of the first region and extending distally from the distal end region of the second region; and

a first retrieval suture interwoven with the proximal stent frame and the distal stent frame, wherein the first retrieval suture is configured to partially collapse the flared proximal stent frame without collapsing the distal stent frame;

wherein the flexible sleeve is configured to extend across a natural valve or sphincter and collapse upon itself in response to a radially applied force.

2. The implant of claim 1 , wherein the first retrieval suture includes a first suture loop interwoven with the flared proximal stent frame, a second suture loop interwoven with the distal stent frame, and a connecting suture portion extending between and coupling the first and second suture loops.

3. The implant of claim 2 , wherein a proximal force exerted on the first retrieval suture is configured to partially collapse the flared proximal stent frame adjacent the proximal end region of the first region.

4. The implant of claim 3 , wherein once the outer diameter of the flared proximal stent frame adjacent the proximal end region of the first region is partially collapsed, the distal stent frame is configured to begin collapsing simultaneously with further collapsing of the proximal stent frame.

5. The implant of claim 3 , wherein the connecting suture portion includes a slack portion which is configured to be drawn taut as the flared proximal stent frame is partially collapsed before the distal stent frame begins to collapse.

6. The implant of claim 2 , wherein a distal force exerted on the first retrieval suture is configured to partially collapse the distal stent frame adjacent the distal end region of the third region.

7. The implant of claim 2 , wherein the connecting suture portion includes a slack portion which is configured to be drawn taut as the distal stent frame is partially collapsed before the flared proximal stent frame begins to collapse.

8. The implant of claim 2 , further comprising a second retrieval suture interwoven with the flared proximal stent frame and the distal stent frame.

9. The implant of claim 8 , wherein at least one of the first or second retrieval sutures is configured to at least partially collapse the flared proximal stent frame prior to collapsing the distal stent frame.

10. The implant of claim 8 , wherein at least one of the first or second retrieval sutures is configured to at least partially collapse the distal stent frame prior to collapsing the flared proximal stent frame.

11. The implant of claim 2 , wherein a length of the connecting suture portion is greater than a distance between the first suture loop and the second suture loop.

12. The implant of claim 1 , wherein the outer diameter of the flared proximal stent frame adjacent the proximal end region of the first region is in the range of about 25 millimeters (mm) to about 50 mm.

13. The implant of claim 1 , wherein the outer diameter of the distal stent frame is in the range of about 15 millimeters (mm) to about 25 mm.

14. An implant, the implant comprising:

an elongated tubular member comprising:

a proximal stent having a proximal end region and a distal end region, the proximal stent tapering from a first outer diameter adjacent the proximal end region to a second smaller outer diameter adjacent the distal end region;

a flexible sleeve having a proximal end region and a distal end region, the flexible sleeve extending distally from the distal end region of the flared proximal stent; and

a distal stent having a proximal end region and a distal end region, the distal stent having an outer diameter less than the first outer diameter of the proximal stent and extending distally from the distal end region of the flexible sleeve;

a first retrieval suture interwoven with the proximal stent and the distal stent, wherein the first retrieval suture is configured to at least partially collapse the proximal stent prior to beginning to collapse the distal stent;

wherein the flexible sleeve is configured to extend across a natural valve or sphincter and collapse upon itself in response to an applied radial force.

15. The implant of claim 14 , wherein the proximal stent is configured to be positioned at a gastric outlet of a stomach and the flexible sleeve is configured to be positioned across a pyloric sphincter.

16. The implant of claim 15 , wherein the applied radial force is a natural action of the pyloric sphincter.

17. The implant of claim 14 , wherein the first retrieval suture is configured to at least partially collapse the distal stent prior to begin collapsing the proximal stent.