Stent delivery system for prevention of kinking, and method of loading and using same
DCFirst Claim
1. A stent delivery system-adapted to deliver a compressed stent having a proximal end and a distal end to a distal deployment location inside a body lumen from a proximal access location outside the body lumen, the stent delivery system comprising:
- a pusher having a distal end located adjacent the stent proximal end; and
a catheter tip having a proximal end located adjacent the stent distal end and attached to a central core slideably disposed within the pusher;
wherein at least one of the pusher distal end and catheter tip proximal end comprises a docking section adapted to releasably engage a limited length of one end of the compressed stent, the docking section comprising an axially flared engagement surface which extends inside a short axial length of the stent.
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Abstract
A stent delivery system adapted to deliver a compressed stent to a distal deployment location inside a body lumen from a proximal access location outside the body lumen. The system houses a compressed stent and includes a pusher and a catheter tip attached to a central core slideably disposed within the pusher. At least one of the pusher distal end and catheter tip proximal end comprises a docking section adapted to releasably engage a limited length of one end of the compressed stent. The docking section may comprise a pocket having a flared end rim that is radially biased outward and adapted to be inwardly compressed to grip the stent end when the docking section is loaded in an outer sheath. Other docking section configurations are also disclosed, such as an insert within the stent, an annular pocket, and/or a set of fingers that grip the stent. A docking pusher and a docking catheter tip having such docking sections are disclosed, as are methods for loading and deploying a stent with a stent delivery system as described herein.
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Citations
36 Claims
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1. A stent delivery system-adapted to deliver a compressed stent having a proximal end and a distal end to a distal deployment location inside a body lumen from a proximal access location outside the body lumen, the stent delivery system comprising:
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a pusher having a distal end located adjacent the stent proximal end; and
a catheter tip having a proximal end located adjacent the stent distal end and attached to a central core slideably disposed within the pusher;
wherein at least one of the pusher distal end and catheter tip proximal end comprises a docking section adapted to releasably engage a limited length of one end of the compressed stent, the docking section comprising an axially flared engagement surface which extends inside a short axial length of the stent. - View Dependent Claims (2)
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- 3. A pusher adapted to facilitate delivery of a compressed stent to a distal deployment location inside a body lumen from a proximal access location outside the body lumen, the pusher having a distal end comprising a docking section having a flared end rim with an inward protrusion that is radially biased outward relative to the compressed stent and adapted for the inward protrusion to releasably grip a limited length of a proximal end of the stent in pushing engagement therewith when the flared end rim is inwardly compressed to a non-flared diameter.
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8. A pusher adapted to facilitate delivery of a compressed stent to a distal deployment location inside a body lumen from a proximal access location outside the body lumen, the pusher having a distal end comprising a docking section that is radially biased outward relative to the compressed stent and adapted to releasably engage a limited length of a proximal end of the stent in pushing engagement therewith, wherein the docking section comprises an insert comprising an axially flared engagement surface adapted to be inserted within the stent proximal end.
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9. A catheter tip having a proximal end comprising a docking section adapted to releasably engage a limited length of a distal end of a compressed stent during delivery of the stent to a distal deployment location inside a body lumen from a proximal access location outside the body lumen wherein the docking section comprises an axially flared engagement surface comprising a reduced diameter section of the catheter tip that extends inside a short axial length of the stent.
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10. A method for loading a stent delivery system adapted to deliver a compressed stent having a proximal end and a distal end to a distal deployment location inside a body lumen from a proximal access location outside the body lumen, the stent delivery system comprising a pusher having a distal end located adjacent the stent proximal end, and a catheter tip having a proximal end located adjacent the stent distal end and attached to a central core slideably disposed within the pusher;
- the method comprising;
loading at least the compressed stent and a pusher within an outer sheath, including releasably engaging a portion of one of;
the stent proximal end with a pusher docking section that is radially biased outward relative to the compressed stent at the pusher distal end;
the stent distal end with a catheter tip docking section;
or a combination thereof, wherein at least one of the pusher docking section or the catheter tip docking section comprises (a) a flared end rim that is radially biased outward and adapted to be inwardly compressed, the docking section comprising a pocket having an inward protrusion that grips the stent when the docking section is loaded within the outer sheath, or (b) an axially flared engagement surface which extends inside a short axial length of the stent. - View Dependent Claims (11, 12)
- the method comprising;
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13. A method for deploying a stent in a distal deployment location inside a body lumen from a proximal access location outside the body lumen, the method comprising:
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a) introducing a pre-loaded stent delivery system into the body lumen, the stent delivery system housing a compressed stent having a proximal end and a distal end and comprising a pusher having a distal end located adjacent the stent proximal end and a catheter tip having a proximal end located adjacent the stent distal end and attached to a central core slideably disposed within the pusher, one or both of the pusher distal end and catheter tip proximal end comprising a docking section that releasably engages a limited length of one end of the compressed stent, and an outer sheath overlying the compressed stent, the pusher, and each docking section, at least one of the pusher docking section or catheter tip docking sections comprising at least one of;
an annular pocket having an inner wall and an outer wall, a pocket having a radial protrusion therein adapted to releasably secure the distal end of the stent within the pocket, or an axially flared engagement surface that extends inside a short axial length of the stent;
b) navigating the stent delivery system to a desired location for deploying the stent; and
c) retracting the outer sheath to deploy the stent from the outer sheath into the desired location and to release the stent from each docking section. - View Dependent Claims (14, 15, 16, 17)
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18. A stent delivery system adapted to deliver a compressed stent from a proximal access location outside the body lumen to a distal deployment location inside a body lumen, the compressed stent having a proximal end and a distal end, the stent delivery system comprising at least one docking section defining a pocket adapted to releasably contain a limited length of one end of the compressed stent, the pocket comprising at least one of:
- (a) an annular pocket having an inner wall and an outer wall, and (b) a pocket having a radial protrusion therein adapted to releasably secure the distal end of the stent within the pocket.
- View Dependent Claims (19, 20, 21)
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22. A method for loading a stent delivery system adapted to deliver a compressed stent from a proximal access location outside the body lumen to a distal deployment location inside a body lumen, the stent having a proximal end and a distal end, the stent delivery system comprising a pusher, a catheter tip attached to a central core slideably disposed within the pusher, at least one docking section defining a pocket adapted to releasably contain a limited length of one end of the compressed stent, and an outer sheath, the docking section pocket comprising at least one of:
- (a) an annular pocket having an inner wall and an outer wall, and (b) a pocket having a radial protrusion therein adapted to releasably secure the distal end of the stent within the pocket;
the method comprising loading the compressed stent about the central core between the catheter tip and the pusher, inserting one of the ends of the stent in the pocket, and enclosing at least the stent, central core, pusher, and each docking section within the outer sheath.
- (a) an annular pocket having an inner wall and an outer wall, and (b) a pocket having a radial protrusion therein adapted to releasably secure the distal end of the stent within the pocket;
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23. A method for deploying a stent in a distal deployment location inside a body lumen from a proximal access location outside the body lumen, the stent having a distal end, a proximal end, a compressed configuration, and an expanded configuration, the method comprising:
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a) introducing a pre-loaded stent delivery system into the body lumen, the stent delivery system housing the stent in the compressed configuration and comprising a pusher, a catheter tip attached to a central core slideably disposed within the pusher, at least one docking section defining a pocket that releasably contains one end of the compressed stent, and an outer sheath overlying the compressed stent, the pusher, and each docking section, the docking section pocket comprising at least one of;
(i) an annular pocket having an inner wall and an outer wall, and (ii) a pocket having a radial protrusion therein adapted to releasably secure the distal end of the stent within the pocket;
b) navigating the stent delivery system to a desired location for deploying the stent;
c) retracting the outer sheath to deploy at least a portion of the stent in the expanded configuration in the deployment location; and
d) releasing from each pocket the end of the stent contained in the pocket.
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24. A stent delivery system adapted to deliver a compressed stent having a proximal end and a distal end to a distal deployment location inside a body lumen from a proximal access location outside the body lumen, the stent delivery system comprising:
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a pusher having a distal end located adjacent the stent proximal end;
a catheter tip having a proximal end located adjacent the stent distal end and attached to a central core slideably disposed within the pusher, at least one of the pusher distal end and catheter tip proximal end comprising a docking section adapted to releasably engage a limited length of one end of the compressed stent; and
wherein the docking section comprises a pocket having a radial protrusion therein adapted to releasably secure the stent end within the pocket. - View Dependent Claims (25, 26, 27, 28, 29)
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- 30. A pusher having a distal end comprising a docking section adapted to releasably engage a limited length of a distal end of a compressed stent during delivery of the stent to a distal deployment location inside a body lumen from a proximal access location outside the body lumen, the docking section comprising a pocket having a radial protrusion therein adapted to releasably secure the proximal end of the stent within the pocket.
- 32. A catheter tip having a proximal end comprising a docking section adapted to releasably engage a limited length of a distal end of a compressed stent during delivery of the stent to a distal deployment location inside a body lumen from a proximal access location outside the body lumen, the docking section comprising a pocket having a radial protrusion therein adapted to releasably secure the distal end of the stent within the pocket.
Specification