Stent with anti-migration devices
A stent is disclosed that has an elongated body composed of a bioabsorbable polymer having a proximal end, a distal end, two open spiral channels formed on the exterior surface of the body to provide fluid communication between the proximal end and the distal end. The stent has a central lumen open at the proximal and distal ends of the stent for the passage of a guide wire. The stent also has an anti-migration device used for immobilization of the stent at the target site.
1. A stent comprising:
an elongated body composed of a biodegradable material having a proximal end, a distal end, at least one open spiral channel formed on the exterior surface of said body to provide fluid communication between said proximal end and said distal end,
a central lumen open at the proximal and distal ends of the stent for the passage of a guide wire, wherein the central lumen comprises an oval or elliptical cross-section and is not in fluid communication with the at least one open spiral channel,
wherein said stent comprises at least two anti-migration tails extending beyond at least one end of the elongated body in a longitudinal direction, and
wherein the at least two anti-migration tails extending from at least one end of the elongated body form a Y-shape with the elongated body,
wherein said anti-migration tails are blunt-shaped at their ends.
2. The stent of claim 1 , wherein the at least two anti-migration tails extending from at least one end of the elongated body are different in length.
3. The stent of claim 1 , wherein the at least two anti-migration tails extending from at least one end of the elongated body are different in thickness.
4. The stent of claim 1 , wherein the at least two anti-migration tails extending from at least one end of the elongated body are made of different material than the elongated body.
5. The stent of claim 1 , wherein at least one of: length, thickness, and flexibility of the at least two anti-migration tails are determined based on expected dimensions of a target site for stent placement relative to dimensions of the stent.
6. The stent of claim 1 , wherein shape of the at least one anti-migration device extending from at least one end of the elongated body is tapered.
7. The stent of claim 1 , wherein shape of the at least one anti-migration device extending from at least one end of the elongated body is flat.
8. The stent of claim 1 , wherein a tip of the at least one anti-migration device extending from at least one end of the elongated body is radiused.
9. The stent of claim 1 , wherein the at least two anti-migration tails are tucked in, in order to remain flush with the body of the stent prior to arrival at the target site.
10. The stent of claim 1 , wherein the stent comprises a single extension protruding longitudinally from an internal position proximal to a first end of the elongated body toward a second end of the elongated body.
11. A stein comprising:
an elongated body composed of a biodegradable material having a proximal end, a distal end, at least one open spiral channel formed on the exterior surface of said body to provide fluid communication between said proximal end and said distal end,
a central lumen open at the proximal and distal ends of the stent for the passage of a guide wire and wherein the central lumen is not in fluid communication with the at least one open spiral channel, and
wherein said stent comprises at least two anti-migration tails extending from at least one end of the elongated body in a longitudinal direction such that the at least two anti-migration tails form a Y-shape with the elongated body,
wherein said anti-migration tails are blunt-shaped at their ends.