| 摘要 |
A prosthetic delivery device is adapted for introducing a stent within a patient's vasculature through a reverse deployment procedure, beginning at a proximal location and finishing at a distal location. The device comprises: a guide tube, a rotation tube, and an outer tube. The guide tube threadably receives the rotation tube thereon. The rotation tube comprises a sheath rotatably secured at one end to overhang over a portion of the outer tube, which is received over a portion of the rotation tube, and which is fixedly secured to the guide tube. Rotating the rotation tube causes its translation relative to the outer tube. A stent crimped to be disposed beneath the sheath is forced to deploy proximally by relative movement of an annular deployment ring on the outer tube. A key on the outer tube is received within a key way of the sheath to prevent its rotation. |
| 主权项 |
1. A stent placement device, for use in placing a stent within a patient's vasculature through a reverse deployment procedure, with deployment beginning at a proximal location and ending at a distal location, said prosthetic delivery device comprising:
a guide tube having a proximal end and a distal end; a portion of said guide tube comprising external threading; a rotation tube having a proximal end and a distal end, a portion of an inner surface of said rotation tube comprising internal threading configured to threadably engage with said external threading of said guide tube; a sheath, said sheath attached in proximity to said distal end of said rotation tube, and configured to extend toward said proximal end of said rotation tube; an outer tube having a proximal end and a distal end, an inner surface of said outer tube configured to receive a portion of said rotation tube therein; wherein when said rotation tube is at a first position relative to said guide tube, said sheath is configured to overhang a portion of an outer surface of said outer tube, said portion of said outer surface of said outer tube being from proximate to its distal end to a position between its distal and proximal ends; said portion of said outer surface of said outer tube configured to provide a clearance gap with an inner surface of said sheath, to receive an outwardly biased self-expanding stent therein; means of fixedly securing said outer tube to said guide tube, while permitting relative motion of said rotation tube thereto; a deployment ring configured to protrude outwardly from said outer surface of said outer tube; wherein rotation of said rotation tube relative to said guide tube causes said threaded engagement therebetween to cause corresponding movement of said rotation tube, distally, from said first position to a second position; and wherein said distal movement of said rotation tube is configured to correspondingly cause movement of said sheath relative to said deployment ring, with said deployment ring configured to urge deployment of the stent out from said gap, to permit said proximal-to-distal stent deployment. |
