Methods and apparatus for luminal stenting
AssigneeCovidien LP
InventorChris Folk
Life of this patent
Estimating the term…
Abstract
A stent delivery assembly and methods of use are provided. The assembly can comprise a catheter, a cover member, a core member, a stent, and a stent retention mechanism. The stent can extend within the cover member lumen and have a section extending at least partially between an inner layer of the cover member and the core member. The stent retention mechanism can be coupled to the core member and comprise an outer surface that is configured to exert a radially outward force against the stent for axially restraining the stent relative to the core member when the stent is in contact with the inner layer of the cover member.
Claims23
A stent delivery assembly, comprising:
- a catheter comprising a lumen;
- a dual layer cover member, extending within the catheter lumen, having a lumen, an inner layer, and an outer layer;
- a core member extending within the cover member lumen;
- a stent, extending within the cover member lumen, having a section extending at least partially between the inner layer and the core member;
- and
- a stent retention mechanism, extending within the cover member lumen, coupled to the core member, the stent retention mechanism comprising an outer surface configured to exert a radially outward force against the stent for axially restraining the stent relative to the core member when the stent is in contact with the inner layer.
A stent delivery assembly, comprising:
- an outer member having a lumen and being configured to be positioned in a blood vessel;
- an inner member, extending within the outer member lumen, having a lumen and an inner surface;
- a core member, extending within the inner member lumen, having an enlarged portion;
- and
- a self-expanding stent, extending over the enlarged portion with a section of the stent being radially squeezed between the enlarged portion and the inner surface for resisting axial movement of the stent relative to the core member, wherein friction between the stent section and the enlarged portion is greater than friction between the stent and the inner surface;
- wherein the inner member is configured to maintain the stent in a collapsed configuration when the inner member is advanced within the outer member, the inner member being retractable relative to the core member to expose the stent and permit expansion of the stent.
A method of operating a stent delivery system within a vessel of a patient, comprising:
- positioning a delivery catheter, having a proximal end, a distal end, and a lumen extending between the proximal and distal ends, in the vessel to allow the catheter distal end to be at a treatment site;
- positioning a core assembly within the catheter lumen, the core assembly comprising (i) an inner member having a lumen and an inner surface, (ii) a core member, extending within the inner member lumen, having an enlarged portion, (iii) a self-expanding stent extending over the enlarged portion and having a section being radially squeezed between the inner surface and the enlarged portion;
- while maintaining the stent in a collapsed configuration within the inner member, advancing the core assembly distally through the catheter to allow the stent to be positioned distally beyond the catheter distal end;
- and
- while radially squeezing the stent section between the enlarged portion and the inner member, proximally retracting the inner member relative to the core member to expose the stent and permit expansion of the stent from the collapsed configuration into apposition with a vessel wall at the treatment site.
Dependencies are inferred from the claim text.