Pull back stent delivery system
First Claim
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1. A delivery system for implantation of a medical device in a vessel, comprising:
- a medical device; and
elongate flexible catheter means having proximal and distal ends for delivering a medical device to a predetermined location in a vessel of a patient, the elongate flexible catheter means being further comprised of;
an inner shaft which carries the medical device near its distal end,a middle pull back shaft concentrically arranged around the inner shaft, the medical device being carried between the inner shaft and middle pull back shaft, andan outer stiffening shaft concentrically arranged around the middle pull back shaft, the inner and outer shafts being connected at their proximal ends to prevent axial movement of the inner shaft with respect to the outer shaft,whereby the medical device is delivered at the desired site by pulling on the proximal end of the middle pull back shaft, which deploys the medical device, and where the outer stiffening shaft connection to the inner shaft prevents axial movement of the inner shaft with respect to the outer stiffening shaft, thereby preventing the distal end of the inner shaft from being urged forward during delivery and therefore allowing for more accurate placement of the medical device.
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Abstract
A delivery system for implantation of a medical device in a vessel which has three concentric shafts, an inner shaft for carrying a medical device, a middle pull back shaft and an outer stiffening shaft. The inner and outer shafts are connected together at the proximal end of the delivery system to preclude the inner shaft from moving axially relative to the outer shaft as the middle pull back shaft is retracted. This allows for accurate placement of the medical device.
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Citations
5 Claims
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1. A delivery system for implantation of a medical device in a vessel, comprising:
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a medical device; and
elongate flexible catheter means having proximal and distal ends for delivering a medical device to a predetermined location in a vessel of a patient, the elongate flexible catheter means being further comprised of;an inner shaft which carries the medical device near its distal end, a middle pull back shaft concentrically arranged around the inner shaft, the medical device being carried between the inner shaft and middle pull back shaft, and an outer stiffening shaft concentrically arranged around the middle pull back shaft, the inner and outer shafts being connected at their proximal ends to prevent axial movement of the inner shaft with respect to the outer shaft, whereby the medical device is delivered at the desired site by pulling on the proximal end of the middle pull back shaft, which deploys the medical device, and where the outer stiffening shaft connection to the inner shaft prevents axial movement of the inner shaft with respect to the outer stiffening shaft, thereby preventing the distal end of the inner shaft from being urged forward during delivery and therefore allowing for more accurate placement of the medical device. - View Dependent Claims (2, 3, 4, 5)
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Specification