Stent-graft with proximal and distal attachment, delivery catheter and methods of making same
View Patent ↗A metallic or pseudometallic covered stent in which the stent component and the cover component are each fabricated of biocompatible metallic or pseudometallic materials, in which the cover and the stent are joined by at least one juncture at each of a proximal and distal end of the stent and the cover. A method of joining the stent and the cover is also disclosed.
1. A method for preparing an implantable medical device, comprising:
a) loading a stent into a lumen of a loading tube such that a first end region of the stent projects beyond a first terminal end of the loading tube;
b) loading a cover over the terminal end of the loading tube and slidably engaging the cover onto the loading tube such that a first end region of the cover is in apposition with the first end region of the stent that projects beyond the first terminal end of the loading tube;
c) joining the first end region of the cover to the first end region of the stent in a first join to form a covered stent assembly having the first join;
d) loading the covered stent assembly having the first join into a restraining tube such that a second end region of the cover and a second end region of the stent project beyond a terminal end of the restraining tube; and
e) joining the second end region of the cover to the second end region of the stent in a second join to form the implantable medical device.
2. The method of claim 1 , wherein steps c) and e) further comprise the step of forming the first join and the second join by resistance welding.
3. The method of claim 2 , further comprising the step of passivating the covered stent assembly.
4. The method of claim 1 , further comprising the step of transferring the covered stent assembly from the restraining tube into a catheter sheath.
5. The method of claim 4 , further comprising the steps of:
a) disposing a pusher member within the catheter sheath prior to loading the implantable medical device into the catheter sheath;
b) sliding the implantable medical device into the catheter sheath such that it is at least in adjacent proximity to the pusher member; and
c) disposing a guidewire sheath through a central bore in the pusher member and through a central lumen of the implantable medical device.
6. The method of claim 4 , wherein said catheter sheath further comprises a tapered catheter sheath.
7. The method of claim 6 , further comprising:
a) disposing a pusher member within the tapered catheter sheath prior to loading the implantable medical device into the catheter sheath;
b) sliding the implantable medical device into the tapered catheter sheath such that it is at least in adjacent proximity to the pusher member; and
c) disposing a guidewire sheath through a central bore in the pusher member and through a central lumen of the implantable medical device.
8. A method of joining a stent with a stent cover, comprising the steps of:
a) loading the stent into a lumen of a loading tube such that a first end region of the stent projects beyond a first terminal end of the loading tube;
b) loading the stent cover over the first terminal end of the loading tube and slidably engaging the stent cover onto the loading tube such that a first terminal end region of the stent cover is in apposition with the first end region of the stent that projects beyond the first terminal end of the loading tube;
c) joining the first terminal end region of the stent cover to the first end region of the stent in a first join to form a covered stent assembly having the first join.
9. The method of claim 8 , wherein step c) further comprises the step of forming the first join by resistance welding.
10. The method of claim 9 , further comprising the step of passivating the first join.