Delivery mechanism for implantable stent
First Claim
1. A stent deployment system for introducing a self-expanding stent into a body vessel, comprising:
- an inner catheter having a proximal end and a distal end, the distal end being attached to a tip, the inner catheter permitting passage of a guidewire therethrough;
a reinforcing spring element surrounding the inner catheter for resisting compression and providing flexibility for moving through a body vessel;
an abutment element attached to a distal end of the reinforcing spring element for preventing axial movement of the self-expanding stent in a proximal direction, the abutment element having an open end; and
an outer catheter having a proximal end and a distal end, the proximal end being attached to a movable member, the distal end surrounding the self-expanding stent, wherein movement of the movable member retracts the outer catheter to release the self-expanding stent.
1 Assignment
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Accused Products
Abstract
A delivery mechanism for an implantable stent which provides a high mechanical advantage to the surgeon and convenient operation so as to facilitate smooth withdrawal of an outer catheter sheath following placement of the stent in the desired location within the patient'"'"'s vessel. Preferred embodiments include a moving rail actuated by a V-shaped lever, a hydraulic actuator, a rack and pinion drive, and a power screw system. The delivery mechanism has a movable member that is attached to the outer catheter sheath so that actuating the mechanism results in an incremental movement of the moveable member, which in turn results in an incremental movement of the outer catheter sheath. Once the outer catheter sheath is retracted from the stent, the stent is deployed into the patient'"'"'s vessel and the remaining parts of the mechanism, including an inner tube, an atraumatic tip, and a stabilizing element, are easily removed.
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Citations
20 Claims
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1. A stent deployment system for introducing a self-expanding stent into a body vessel, comprising:
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an inner catheter having a proximal end and a distal end, the distal end being attached to a tip, the inner catheter permitting passage of a guidewire therethrough; a reinforcing spring element surrounding the inner catheter for resisting compression and providing flexibility for moving through a body vessel; an abutment element attached to a distal end of the reinforcing spring element for preventing axial movement of the self-expanding stent in a proximal direction, the abutment element having an open end; and an outer catheter having a proximal end and a distal end, the proximal end being attached to a movable member, the distal end surrounding the self-expanding stent, wherein movement of the movable member retracts the outer catheter to release the self-expanding stent. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A stent deployment system, comprising:
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an inner catheter having a distal end that extends through a tip that is attached thereto; a reinforcing element surrounding the inner catheter along a portion of its length, an abutment element attached to a distal end of the reinforcing element, the abutment element having a concave surface; and an outer catheter having a proximal end attached to a movable member and a distal end covering a stent so that movement of the movable member moves the outer catheter in a proximal direction to uncover the stent. - View Dependent Claims (16, 17, 18, 19, 20)
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Specification