STENT DELIVERY SYSTEM
First Claim
Patent Images
1. A stent delivery system comprising:
- a shaft section through which extends a guide wire lumen which is open at opposite ends for receiving a guide wire to guide the stent delivery system to a desired position within a living body;
a sheath encircling at least a distal portion of the shaft section so that an inner surface of the sheath faces an outer surface of the shaft section, with a space between the inner surface of the sheath and the outer surface of the shaft section, the sheath being movable in a proximal direction relative to the shaft section;
a self-expandable stent possessing a central axis and a proximal end, the stent encircling the distal portion of the shaft section and being positioned in the space between the inner surface of the sheath and the outer surface of the shaft section so that the sheath covers the stent;
the stent being compressed inwardly towards the central axis of the stent while covered by the sheath, and automatically expanding outwardly into a pre-compression shape when the sheath is moved in the proximal direction relative to the shaft section to a position no longer covering the stent;
the stent comprising a plurality of through openings at a proximal end of the stent;
a breakable fixing wire comprising a first portion and a second portion both fixed to the shaft section so that the first portion and the second portion of the breakable fixing wire move together as a unit with the shaft section, the breakable fixing wire comprising a third portion spaced from the first portion and the second portion, the third portion of the breakable fixing wire passing through the through openings at the proximal end of the stent so that the breakable fixing wire engages the stent and holds the stent relative to the shaft section; and
means for breaking the fixing wire to release the stent from engagement by the other portion of the fixing wire, the third portion of the fixing wire being a portion of the fixing wire between the first portion and the second portion.
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Accused Products
Abstract
A stent delivery system includes a self-expandable stent, a shaft section having a guide wire lumen, and a sheath having distal portion containing the stent. The stent is located at a position which is on the shaft section and near the distal end of the shaft section. The stent delivery system has a stent proximal portion fixing wire and a breaking member. The stent proximal portion fixing wire has one end portion and the other end portion which are fixed to the shaft section, and also has an intermediate portion engaged with a proximal portion of the stent. The breaking member breaks the stent proximal portion fixing wire to release the stent from the engagement.
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Citations
20 Claims
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1. A stent delivery system comprising:
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a shaft section through which extends a guide wire lumen which is open at opposite ends for receiving a guide wire to guide the stent delivery system to a desired position within a living body; a sheath encircling at least a distal portion of the shaft section so that an inner surface of the sheath faces an outer surface of the shaft section, with a space between the inner surface of the sheath and the outer surface of the shaft section, the sheath being movable in a proximal direction relative to the shaft section; a self-expandable stent possessing a central axis and a proximal end, the stent encircling the distal portion of the shaft section and being positioned in the space between the inner surface of the sheath and the outer surface of the shaft section so that the sheath covers the stent; the stent being compressed inwardly towards the central axis of the stent while covered by the sheath, and automatically expanding outwardly into a pre-compression shape when the sheath is moved in the proximal direction relative to the shaft section to a position no longer covering the stent; the stent comprising a plurality of through openings at a proximal end of the stent; a breakable fixing wire comprising a first portion and a second portion both fixed to the shaft section so that the first portion and the second portion of the breakable fixing wire move together as a unit with the shaft section, the breakable fixing wire comprising a third portion spaced from the first portion and the second portion, the third portion of the breakable fixing wire passing through the through openings at the proximal end of the stent so that the breakable fixing wire engages the stent and holds the stent relative to the shaft section; and means for breaking the fixing wire to release the stent from engagement by the other portion of the fixing wire, the third portion of the fixing wire being a portion of the fixing wire between the first portion and the second portion. - View Dependent Claims (2)
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3. A stent delivery system that delivers a stent to a desired position in a living body, the stent delivery system comprising:
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a cylindrically shaped stent possessing a central axis, the stent being compressed toward the central axis of the stent at the time of insertion into a living body, the stent being configured to automatically expand outwardly when placed in the living body to be restored into a pre-compression shape; a shaft section having a guide wire lumen, the shaft section possessing a distal end and a proximal end; a sheath containing the stent, the stent being located on the shaft section at a position near the distal end of the shaft section; a stent proximal portion fixing wire possessing one end portion and an other end portion, the one end portion and the other end portion of the stent proximal portion fixing wire being fixed to the shaft section; the stent proximal portion fixing wire also possessing an intermediate portion which is in engagement with a proximal portion of the stent; and a breaking member for breaking the stent proximal portion fixing wire to release the stent from engagement by the intermediate portion of the stent proximal portion fixing wire. - View Dependent Claims (4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
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19. A method of operating a stent delivery system to deliver a stent to a desired position in a living body, the method comprising:
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positioning a distal portion of a stent delivery system at a desired location in a living body lumen, the stent delivery system comprising;
a shaft section;
a sheath surrounding a distal portion of the shaft section with an annular space between the shaft section and the sheath;
a self-expandable stent surrounding the distal portion of the shaft section, positioned in the space, and covered by the sheath, the stent being compressed toward a central axis of the stent and configured to automatically expand outwardly when the sheath is moved in a proximal direction relative to the shaft section to expose the stent; and
a stent proximal portion fixing wire having one end portion fixed to the shaft section and an other portion in engagement with a proximal portion of the stent;proximally moving the sheath relative to the stent to uncover the stent and allow the stent to automatically expand outwardly, except for the proximal portion of the stent which continues to be engaged by the other portion of the stent proximal portion fixing wire in a manner preventing the proximal portion of the stent from expanding outwardly; and breaking the stent proximal portion fixing wire to release the proximal portion of the stent and allow the proximal portion of the stent to automatically expand outwardly. - View Dependent Claims (20)
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Specification