Stent with enhanced friction
AssigneeCovidien LP
InventorPaul 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 undeployed 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.
Claims16
An intravascular device comprising:
- a tubular stent body expandable from an undeployed configuration to a deployed configuration, the stent body defining an exterior surface and an interior surface arranged about a stent axis, wherein some areas of the interior surface have a roughened surface finish and other areas of the interior surface are devoid of the roughened surface finish, the some areas having the roughened surface finish being on opposite sides of a center line of the stent body, the center line being orthogonal to the stent axis,
- wherein substantially all of the exterior surface of the stent body has a generally smooth finish relative to the roughened surface finish of the interior surface,
- wherein the stent body includes a plurality of ribs defining openings extending through the stent body from the interior surface to the exterior surface, and
- wherein the roughened surface finish of the interior surface defines pits having a maximum dimension of approximately 3 microns to approximately 20 microns in size.
A system comprising:
- a catheter comprising a balloon;
- a stent placed on the catheter surrounding the balloon, the stent comprising:
- a stent body expandable from an undeployed configuration to a deployed configuration, the stent body defining an exterior surface and an interior surface arranged about a stent axis, wherein some areas of the interior surface have a roughened surface finish and other areas of the interior surface are devoid of the roughened surface finish, the some areas having the roughened surface finish being on opposite sides of a center line of the stent body, the center line being orthogonal to the stent axis,
- wherein substantially all of the exterior surface of the stent body has a generally smooth finish relative to the roughened surface finish of the interior surface,
- wherein the stent body includes a plurality of ribs defining openings extending through the stent body from the interior surface to the exterior surface, wherein
- the roughened surface finish of the interior surface defines pits having a maximum dimension of approximately 3 microns to approximately 20 microns in size, and wherein
- wherein the balloon is configured to be inflated to expand the stent to the deployed configuration.
A method comprising:
- creating a roughened surface finish for some areas of an interior surface of a tubular stent body, the stent body being expandable from an undeployed configuration to a deployed configuration, and defining an exterior surface and the interior surface arranged about a stent axis,
- wherein some areas of the interior surface have the roughened surface finish and other areas of the interior surface are devoid of the roughened surface finish, the some areas having the roughened surface finish being on opposite sides of a center line of the stent body, the center line being orthogonal to the stent axis, wherein substantially all of the exterior surface of the stent body has a generally smooth finish relative to the roughened surface finish,
- wherein the stent body includes a plurality of ribs defining openings extending through the stent body from the interior surface to the exterior surface, and
- wherein creating the roughened surface finish comprises defining pits having a maximum dimension of approximately 3 microns to approximately 20 microns in size in the interior surface.
Dependencies are inferred from the claim text.