Stent delivery system
First Claim
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1. A stent delivery system comprising:
- a stent formed into a substantially cylindrical shape,an inner tube body having a guidewire lumen, anda stent housing tube body that houses the stent in a distal portion,wherein the stent is configured to be compressed in a center axis direction when being inserted into a living body and expanded outward to be restored to a shape before compression when being indwelled in a living body,wherein the stent is disposed so as to cover a distal portion of the inner tube body, the stent being discharged by moving the stent housing tube body toward a proximal side relative to the inner tube body,wherein an inner surface of the stent housing tube body from at least a distal end of the stent housing tube body to a proximal part of a stent housing portion is a substantially polygonal prism inner surface extending along an axial direction of the stent housing tube body.
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Abstract
A stent delivery system is provided with a stent which, when inserted into an organism, is compressed in the center axis direction and which, when placed in the organism, can be expanded outward and restored to the shape which the stent has before being compressed; an inner tube body (inner tube); and a stent housing tube body (sheath) in which the stent is housed. The stent can be discharged by moving the stent housing tube body to the proximal side relative to the inner tube body. At least a portion of an inner surface of the stent housing tube body is a substantially polygonal prism-shaped inner surface which extends in the axial direction of the stent housing tube body.
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Citations
20 Claims
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1. A stent delivery system comprising:
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a stent formed into a substantially cylindrical shape, an inner tube body having a guidewire lumen, and a stent housing tube body that houses the stent in a distal portion, wherein the stent is configured to be compressed in a center axis direction when being inserted into a living body and expanded outward to be restored to a shape before compression when being indwelled in a living body, wherein the stent is disposed so as to cover a distal portion of the inner tube body, the stent being discharged by moving the stent housing tube body toward a proximal side relative to the inner tube body, wherein an inner surface of the stent housing tube body from at least a distal end of the stent housing tube body to a proximal part of a stent housing portion is a substantially polygonal prism inner surface extending along an axial direction of the stent housing tube body. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A stent delivery system comprising:
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a stent formed into a substantially cylindrical original shape, a sheath that houses the stent in a distal portion, wherein the stent is configured to be compressed in a center axis direction when being inserted into a living body and expanded outward to be restored to the substantially cylindrical original shape before compression when being indwelled in a living body, wherein an inner surface of the sheath defines a substantially polygonal prism inner surface extending along an axial direction of the sheath. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19)
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20. A method for indwelling a stent in a target stenosis of a living body comprising:
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providing a stent delivery system comprising a stent formed into a substantially cylindrical original shape, an inner tube body having a guidewire lumen, and a stent housing tube body that houses the stent in a distal portion, wherein the stent is configured to be compressed in a center axis direction when being inserted into the living body and expanded outward to be restored to the original shape when being indwelled in the living body, wherein the stent is disposed so as to cover a distal portion of the inner tube body, wherein at least a portion of an inner surface of the stent housing tube body is a substantially polygonal prism inner surface extending along an axial direction of the stent housing tube body, wherein the inner tube body includes a distal-side tube including the guidewire lumen, a proximal-side tube, and a fixing tube to which a proximal portion of the distal-side tube and a distal portion of the proximal-side tube are fixed and that has an opening communicating with the guidewire lumen, wherein the stent housing tube body encloses a distal side of the distal-side tube and is slidable in a proximal direction of the distal-side tube, and at least one pulling wire having one end fixed to the stent housing tube body and extending in the proximal-side tube, the pulling wire configured to move the stent housing tube body toward the proximal side by pulling the pulling wire toward a proximal side of the proximal-side tube, inserting a proximal portion of a guidewire into a distal opening of the distal-side tube of the stent delivery system and leading the guidewire out through the opening in the fixing tube, inserting the stent delivery system into a guiding catheter inserted in the living body, pushing the stent delivery system forward along the guidewire to locate a stent housing portion of the stent housing tube body at the target stenosis, pulling the pulling wire such that the stent housing tube body and a slide tube disposed close to a proximal end of the stent housing tube body move toward a proximal side, abutting a proximal-end surface of the stent on a distal-end surface of a stent proximal part locking portion of the distal-side tube such that the stent is locked, discharging the stent from a distal-end opening of the stent housing tube body, self-expanding the stent at the target stenosis to thereby indwell the stent and expand the stenosis.
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Specification