Indwelling stent and the method for manufacturing the same
First Claim
1. A stent comprising a metal frame structure having a substantially circular cylindrical shape which is compressible to a smaller outside diameter for placement in a portion of a body and which is self-expandable from the smaller outside diameter after placement in the portion of thereby, said frame structure being a single piece of metal material without abrupt changes in physical properties of the metal frame structure and without any welded or soldered portions by removing portions of a super elastic metal pipe, said frame structure comprising wire segments in a shape of a repeating "<
- " which extend helically to form the substantially circular cylindrical shape of the frame structure.
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Accused Products
Abstract
One embodiment of a stent includes a cylindrical openwork frame having holes defined by side frame segments and middle frame segments, and notches defined by the side frame segments. This stent is made of a super elastic metal as a single piece without an abrupt change in the physical property of the stent. Another embodiment of the stent is made of wires in the shape of a substantially circular cylinder. The wires forming the stent are made thicker in the middle portion and thinner in both end portions. A stenosis-treating device includes an indwelling stent, a tubular sheath which holds the stent in a compressed state, a balloon catheter which is passed through the sheath and which has a dilatation balloon, and a projection at the rear of the portion of the sheath in which the stent is held which comes into contact with the rear end of the stent when the sheath is moved rearward and lets the stent out of the front end of the sheath.
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Citations
16 Claims
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1. A stent comprising a metal frame structure having a substantially circular cylindrical shape which is compressible to a smaller outside diameter for placement in a portion of a body and which is self-expandable from the smaller outside diameter after placement in the portion of thereby, said frame structure being a single piece of metal material without abrupt changes in physical properties of the metal frame structure and without any welded or soldered portions by removing portions of a super elastic metal pipe, said frame structure comprising wire segments in a shape of a repeating "<
- " which extend helically to form the substantially circular cylindrical shape of the frame structure.
- View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
- 15. A stent comprising a frame structure having a substantially circular cylindrical shape which is compressible to a smaller outside diameter for placement in a portion of a body and which is self-expandable from the smaller outside diameter after a placement in the portion of the body, said frame structure being formed as a single piece of material without abrupt changes in physical properties of the frame structure and without any welding portions and any soldering portions by removing portions of a Ti--Ni alloy pipe, said frame structure possessing a zigzag shape that extends helically.
Specification