Method and apparatus to prevent stent migration
AssigneeMedtronic AVE, Inc.
InventorsRobert Lashinski, Bradley Jendersee, Michael D. Boneau
Life of this patent
Estimating the term…
Abstract
An endoprosthesis is provided having an expandable, generally cylindrical body portion defining an inside surface and an outside surface. The inside surface is preferably regular and smooth to yield a low coefficient of friction, while the outside surface is modified to yield a relatively high coefficient of friction with a vessel surface, includes a macroscopic surface modification to engage the vessel surface, or includes an adhesive coating that bonds the stent to the vessel surface.
Claims7
A stent for implanting in a vessel within the human body, the vessel having a vessel surface, the stent comprising:
- an expandable, generally cylindrical segment defining an inside surface and an outside surface and comprising a plurality of substatially straight, non-overlapping wire-like segments connected at a plurality of apices, the inside surface being regular and smooth to yield a low coefficient of friction, the outside surface being treated to yield a higher coefficient of friction with the surface;
- wherin the outside surface includes a macroscopic surface modification comprising a multiplicity of substantially uniformly axially oriented features.
A stent for implantation into a vessel having a vessel surface, the stent having an expandable, generally seamless cylindrical body portion defining an inside surface and an outside surface, the inside surface being regular and smooth to provide a low coefficient of friction, the outside surface being treated to yield a higher coefficient of friction with the vessel surface;
- the outside surface comprising a macroscopic surface modification that engages the vessel surface, the macroscopic surface modification comprising a multiplicity of substantially uniformly cross-axial features.
An endovascular support device for implantation in a vessel within the human body, the vessel having an inner vessel surface, the endovascular support device comprising:
- a generally cylindrical body portion defining an inside surface and an outside surface, the body portion expandable from a first diameter to a second diameter;
- and
- wherein the outside surface includes a macroscopic surface modification that engages the inner vessel surface to yield an increased frictional force between the outside surface of the endovascular support device and the inner surface of the vessel, the macroscopic surface modification comprising at least one axially-oriented feature.
An expandable generally cylindrical coronary stent for implantation in a vessel within the coronary vasculature, the stent comprising:
- an inside surface and an outside surface, the outside surface comprising a macroscopic modification that engages the vessel surface, the macroscopic surface modification comprising a multiplicity of axially-oriented grooves that increase the surface area in contact with the vessel.
Dependencies are inferred from the claim text.