Stent with a joining portion and a non-joining portion for joining a stent main wire and a strut
A stent is provided, which joins a plurality of stent components via a strut which, even when repeatedly bent over a long period of time, resists breaking. In particular, a stent is provided having a joining portion which integrally joins a stent main wire and a strut, the stent main wire and the strut being fitted into a restraining pipe in a non-joining portion of the stent main wire and the strut near the end of the joining portion. This construction restrains the relative movement of the stent main wire to the strut 4 is restrained and decreased, thus reducing fatigue.
1. A stent which has a joining portion integrally joining a stent main wire and a strut,
characteristic in that said stent comprises a restraining means which restrains the stent main wire and the strut in a non-joining portion of the stent main wire and the strut near an end of the joining portion while allowing the stent main wire and the strut to be relatively moved away from each other and moved towards each other with a repeated bending which acts on the strut.
2. A stent comprising:
a stent main wire;
a strut,
a joining portion disposed around the stent main wire and the strut so as to integrally join the stent main wire and the strut, said joining portion having a first end and a second end; and
a restraining pipe disposed around the stent main wire and the strut adjacent the second end of the joining portion,
wherein the restraining pipe restrains the stent main wire and the strut in a non-joining manner under repeated bending forces exerted upon the strut and distributing stress along a length of the restraining pipe, thereby reducing fatigue on the second end of the joining portion.
3. The stent of claim 2 , wherein the joining portion is comprised of an auxiliary pipe at the first end thereof, and two or more unit pipes disposed adjacent to the auxiliary pipe.
4. The stent of claim 3 , wherein the restraining pipe has a length equal to or slightly longer than one of the two or more unit pipes.
5. The stent of claim 2 , wherein the stent main wire and the strut are molded flat in an area adjacent the unit pipes of the joining portion.
6. The stent of claim 3 , wherein the auxiliary pipe and the units pipes are substantially rectangular.
7. The stent of claim 2 , wherein a folding back portion is formed in an end of the strut, adjacent to the joining portion, said folding back portion preventing the strut from disengaging from the joining portion.