Treatment of stenotic regions
View Patent ↗An improved method and devices for preventing restenosis are provided. The method may include delivering a stent configured to contain a stenosis to a body vessel. The method may also include using atherectomy at the site prior to stent delivery. In one embodiment, the stent has a proximal end, a distal end, and a center portion arranged such that the diameters of the proximal and distal ends are greater than the diameter of the center portion. In one embodiment, the atherectomy device includes a housing to prevent injury to the unaffected areas of the body vessels but the cutter is extendible beyond the housing. In one embodiment, the stent may be impregnated with at least one drug after stent deployment.
1. A method of inhibiting restenosis, the method comprising:
performing a dilation in a vessel at a vessel site;
delivering a stent to the site;
expanding the stent in the vessel at the vessel site, and
containing a stenosis at the vessel site between the stent and a wall of the vessel and between a proximal portion of the stent and a distal portion of the stent by expanding the stent such that the stent has a larger diameter at the proximal portion and the distal portion than a diameter of a center portion, wherein containing the stenosis further comprises leaving a pocket between the vessel wall and the stent.
2. The method of claim 1 , wherein said containing the stenosis comprises containing the stenosis with no structure between the stent and the stenosis.
3. The method of claim 1 , wherein said containing the stenosis further comprises extending the stent between about 1 mm and about 6 mm beyond the stenosis.
4. The method of claim 1 , wherein said expanding the stent further comprises conforming the stent to the shape of the stenosis.
5. The method of claim 1 , wherein said expanding the stent comprises expanding the stent to a length of between about 3 cm and about 5 cm.
6. The method of claim 1 , wherein said expanding the stent comprises expanding the stent to a diameter of between about 0.1 cm and about 1.5 cm.
7. The method of claim 1 , wherein said expanding the stent further comprises providing structural support to the arterial wall.
8. The method of claim 1 , further comprising compressing a self-expanding stent prior to expanding said stent at the vessel site.
9. The method of claim 1 , wherein said expanding the stent is facilitated by a balloon.
10. The method of claim 1 , further comprising providing a therapeutic agent at said vessel site.
11. The method of claim 10 , wherein said providing the therapeutic agent comprises providing said therapeutic agent in or on said stent.
12. A method of inhibiting restenosis, the method comprising:
providing a stent having, in an expanded state, a proximal end having a first diameter, a distal end having a second diameter, and a center portion having a third diameter, wherein the first diameter and the second diameter are greater than the third diameter;
inserting the stent in a collapsed state into a vessel;
advancing said stent intraluminally to a vessel site and extending said stent beyond a stenosis at said vessel site;
containing said stenosis by expanding said stent such that the proximal end and distal end of the stent extend beyond the stenosis by at least 1 mm, wherein a pocket is left between the vessel and the stent.
13. The method of claim 12 , wherein the distal end is extended beyond the stenosis by about 5 mm.
14. The method of claim 12 , wherein providing the stent comprises providing a stent wherein at least one of either the first diameter and second diameter is greater than the other of the first diameter and second diameter.
15. The method of claim 12 , wherein the stent conforms to the stenosis when expanded.
16. A method of inhibiting restenosis, the method comprising:
mapping the stenosis with a radiopaque balloon;
performing a dilation in a vessel at a vessel site;
delivering a stent to the site;
expanding the stent in the vessel at the vessel site, and
containing a stenosis at the vessel site between the stent and a wall of the vessel and between a proximal portion of the stent and a distal portion of the stent by expanding the stent such that the stent has a larger diameter at the proximal portion and the distal portion than a diameter of a center portion.
17. The method of claim 16 , wherein said containing the stenosis comprises containing the stenosis with no structure between the stent and the stenosis.
18. The method of claim 16 , wherein said containing the stenosis further comprises extending the stent between about 1 mm and about 6 mm beyond the stenosis.
19. The method of claim 16 , wherein said expanding the stent further comprises conforming the stent to the shape of the stenosis.
20. The method of claim 16 , wherein said expanding the stent comprises expanding the stent to a length of between about 3 cm and about 5 cm.
21. The Method of claim 16 , wherein said expanding the stent comprises expanding the stent to a diameter of between about 0.1 cm and about 1.5 cm.
22. The method of claim 16 , wherein said expanding the stent further comprises providing structural support to the arterial wall.
23. The method of claim 16 , further comprising compressing a self-expanding stent prior to expanding said stent at the vessel site.
24. The method of claim 16 , wherein said expanding the stent is facilitated by a balloon.
25. The method of claim 16 , further comprising providing a therapeutic agent at said vessel site.
26. The method of claim 25 , wherein said providing the therapeutic agent comprises providing said therapeutic agent in or on said stent.