Stent delivery system
Medical device and methods for delivery or implantation of prostheses within hollow body organs and vessels or other luminal anatomy are disclosed. The subject technologies may be used in the treatment of atherosclerosis in stenting procedures.
1 . A self-expanding stent delivery system comprising:
a sleeve for restraining a stent in a compressed form, an inner member for receipt within at least a portion of the sleeve, the inner member comprising a corewire and outer cladding,
the corewire comprising a distal stent-bearing section, and
the cladding covering at least a distal portion of the corewire proximal to the stent-bearing section,
wherein the inner member is adapted to provide increased flexibility in a proximal to distal fashion, and has a substantially constant diameter proximal to the stent bearing section.
2 . The system of claim 1 , wherein the stent-bearing section has a constant diameter.
3 . The system of claim 1 , wherein the corewire comprises a tapered section proximal to the distal stent-bearing section, and wherein the cladding covers at least the tapered section and has an inner surface having a space-filling profile that is complimentary to the tapered section of the corewire.
4 . The system of claim 3 , wherein the space-filling profile of the cladding comprises a taper having a slope inverse to that of the tapered section of the corewire.
5 . The system of claim 3 , wherein the corewire further comprises a constant diameter section proximal to the tapered section.
6 . The system of claim 1 , comprising a plurality of cladding sections with different material properties.
7 . The system of claim 6 , wherein the corewire comprises a constant diameter, and the plurality of sections have progressively lower modulus of elasticity in a proximal to distal direction.
8 . The system of claim 1 , wherein the cladding is made of material having a modulus of elasticity less than the corewire.
9 . The system of claim 1 , further comprising a stent.
10 . The system of claim 9 , wherein the stent comprises superelastic shape memory alloy material.
11 . The system of claim 1 , further comprising a filter operatively attached to the corewire at a location distal to the stent-bearing section.
12 . The system of claim 11 , wherein the filter comprises superelastic shape memory alloy material.
13 . The system of claim 1 , further comprising a stop for the stent at a distal end of the cladding.
14 . The system of claim 13 , wherein the stop is selected from one of an comprises one of a band and a disc.
15 . A self-expanding stent delivery system comprising:
a corewire comprising a constant diameter distal section upon which the stent is received and a body section proximal to the distal section, and having a cladding covering at least the proximal section, wherein the cladding has a constant outer diameter;
a filter mechanism attached to the distal section of the corewire; and
an outer sleeve set over the corewire and cladding, wherein the outer sleeve is adapted to hold stent and filter in reduced states.
16 . The system of claim 15 , wherein the body section includes at least one tapered portion.
17 . The system of claim 15 , wherein the body section is constant in diameter.
18 . The system of claim 15 , wherein the filter mechanism is self-expanding.
19 . The system of claim 15 , wherein the filter mechanism is positioned distally of the stent.
20 . The system of claim 15 , further comprising a stop for the stent at a distal end of the cladding.