Stent with enhanced friction
AssigneeCovidien LP
InventorPaul J. Thompson
Life of this patent
Estimating the term…
Abstract
A stent for placement in a body lumen is fabricated by forming a tube having an un-deployed diameter sized for the tube to be placed on a deployment balloon and advanced through a body lumen to a deployment site. The tube is expandable upon inflation of the balloon to an enlarged diameter sized for the tube to be retained within the lumen at the site upon deflation and withdrawal of the balloon. The tube has a stent axis extending between first and second axial ends of the tube. The tube has an exterior surface and an interior surface. The tube is polished to polish the exterior surface to a smooth surface finish and with at least a portion of the interior surface having a rough surface finish rougher than the surface finish of the exterior surface.
Claims10
An intravascular device, which comprises:
- a stent body comprising an un-deployed orientation for introduction and passage through vasculature for positioning adjacent a deployment site therewithin, and a deployed orientation in which the stent body is capable of being retained within the vasculature at the deployment site, the stent body including a metal base and defining an interior surface and an exterior surface arranged about a stent axis, the stent body having a plurality of ribs defining openings extending through the stent body from the interior surface to the exterior surface, and having radial surfaces extending from the interior surface to the exterior surface, at least a segment of the interior surface having a roughened surface finish defined in the metal base and wherein the exterior surface of the stent body has a generally smooth finish relative to the roughened surface finish of the interior surface, and
- wherein the roughened surface finish is dimensioned to extend along the stent axis and is spaced from axial ends of the stent body such that axial end segments of the interior surface are devoid of the roughened surface finish and a central segment between the axial end segments has the roughened surface finish.
An intravascular stent, which comprises:
- a stent body defining a stent axis and having a plurality of ribs defining open cells extending through the stent body, the ribs having interior surfaces and exterior surfaces and being coaxially arranged about the stent axis, the open cells extending from the interior surfaces of the ribs to the exterior surfaces of the ribs, the stent body being adapted to transition from an un-deployed orientation for introduction and passage through vasculature for positioning adjacent a deployment site therewithin, and a deployed orientation in which the stent body is capable of being retained within the vasculature at the deployment site, at least some of the interior surfaces each being devoid of a coating and having a roughened surface finish relative to a surface finish of the exterior surfaces, and
- wherein the stent body defines a longitudinal axis and has axial end segments, and a central segment defined between the axial end segments, the interior surfaces of the ribs of the axial end segments being devoid of the roughened surface finish and the interior surfaces of the ribs of the central segment having the roughened surface finish.
Dependencies are inferred from the claim text.