Self-expanding medical device
The invention relates to a helical coil comprising multiple reversing sense helical coil units that are capable of drug elution, come in lengths appropriate for long, diffuse lesions, have the ability to have a step-wise tapering diameter, and provide all the benefits of a small closed cell stent design while maintaining high flexibility, high radial force and crush resistance due to an underlying helical coil.
1. A device for placement in a lumen, the device comprising: a plurality of segments, wherein each segment comprises a first helical coil and a second helical coil of opposing winding sense and each segment is connected to another segment by a first structure, wherein each first structure changes the winding sense of adjacent segments, wherein each first structure comprises a cross-over point comprising an end of one of the first helical coils overlapping an end of one of the second helical coils, wherein the end of the first helical coil and the end of the second helical coil are joined, and each first structure extends into and fills a gap created by the divergence of the segments connected to each first structure, and wherein each first structure pushes the end of the first helical coil and the end of the second helical coil against a wall of the lumen and exerts force on the lumen.
2. The device according to claim 1 , wherein the segments and each first structure are configured to exert forces on the wall of the lumen wherein the device is placed, and where the effect of said forces holds the device in place within the lumen.
3. The device according to claim 1 , wherein the first and second helical coils of each segment are connected by a second structure.
4. The device according to claim 1 , wherein the device comprises a covering.
5. The device according to claim 4 , wherein the covering comprises a mesh, sheet, cloth, foam or film.
6. The device according to claim 1 , comprising a covering that spans a length of the device from one end to the other and is attached to varying locations on the device including but not limited to at or near ends of the device, at or near each first structure of the device, or at any other location.
7. The device according to claim 6 , wherein the covering is attached to the device along an edge of the covering.
8. The device according to claim 6 , wherein the covering is attached to the device along opposite edges of the covering.
9. The device according to claim 6 , wherein the covering comprises drugs.
10. The device according to claim 1 , wherein the plurality of segments comprise one or more drugs that are configured to be released into the lumen or into the wall of the lumen.
11. The device according to claim 1 , wherein a diameter of the device is constant along its length.
12. The device according to claim 1 , wherein a diameter of the device varies along its length.
13. A system comprising a delivery means, wherein the delivery means is removably connected to the device of claim 1 .
14. The system according to claim 13 , wherein the delivery means releases one or more of the devices at a specific location within a lumen.
15. The system according to claim 13 , wherein the delivery means comprises one or more catheters.
16. The system according to claim 13 , wherein the delivery means comprises a mechanical delivery mechanism.