Trans-luminal surgical device
A device for trans-luminal delivery of a self-expanding stent or other surgical device and which is designed for rapid exchange over a guidewire has a guidewire lumen that adjacent its proximal exit port lies side-by-side with the line of the shaft of the device. A sleeve which surrounds and confines the stent has a proximal end that is shaped around the guidewire exit port to show in profile a shape reminiscent of the nose of a dolphin. In preferred embodiments, the sleeve also has a tapered distal tip that is withdrawn proximally over the length of the stent to release it, progressively, from its distal end. The configuration delivers simplicity of design, enhanced performance and reliability in use.
1. A trans-luminal, guidewire-advanced, rapid-exchange surgical delivery device having a proximal end, a primary shaft and a distal zone to be advanced over a guidewire along a bodily lumen to a site of surgery, the distal zone comprising:
a sleeve including a tapered proximal portion having a guidewire lumen exit port, a proximal end through which the primary shaft extends, and a distal end tapered to a leading annulus that defines approximately an outer diameter of the guidewire;
a swaging ring compressing an annulus of the sleeve adjacent a distal end of the primary shaft;
a shaped member positioned within the sleeve, including a first guidewire lumen and a second lumen, the shaped member having a tapered distal end; and
a push wire extending through the primary shaft, through the second lumen of the shaped member and connecting to a pusher ring.
2. The device according to claim 1 , wherein the sleeve is reinforced by filamentary material within its wall thickness.
3. The device according to claim 2 , wherein the filamentary material is braided material.
4. The device according to claim 2 , wherein the filamentary material stops distally short of the distal end of the sleeve.
5. The device according to claim 1 , wherein the proximal end of the sleeve is form-fitted by the application of heat and radially inward pressure.