Stent with enhanced friction
AssigneeTyco Healthcare Group LP
InventorPaul J. Thompson
Life of this patent
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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.
Claims24
A method for fabricating a stent for placement in the body lumen, the method comprising:
- forming an expandable stent body having a plurality of ribs defining a plurality of open cells, the stent body being sized to be advanced through a body lumen to a deployment site, the stent body having a stent axis extending between first and second axial ends of the stent body, the plurality of ribs having an exterior surface and an interior surface, the interior surface being configured to engage a balloon;
- and
- directing a stream of particulate at the interior surface of at least a region of the plurality of ribs to selectively remove material from the interior surface of said region to make the interior surface of said region rougher than before said directing commenced, a surface finish of the interior surface being rougher than a surface finish of the exterior surface.
A method of deploying a stent in a body lumen, the method comprising:
- fabricating a stent by
- forming an expandable stent body having a plurality of ribs defining a plurality of open cells, the stent body being sized to be advanced through the body lumen to a deployment site, the stent body having a stent axis extending between first and second axial ends of the stent body, the plurality of ribs having an exterior surface and an interior surface, and
- directing a stream of particulate at the interior surface of at least a region of the plurality of ribs to selectively remove material from the interior surface of said region to make the interior surface of said region rougher than before said directing commenced, a surface finish of the interior surface being rougher than a surface finish of the exterior surface;
- placing the stent on a balloon-tipped catheter such that the region of said interior surface of the plurality of ribs roughened by the stream of particulate frictionally engages a balloon;
- and
- advancing the catheter and the stent to the deployment site in the body lumen.
A method for fabricating a stent for placement in a body lumen, the method comprising:
- forming an expandable stent body having a plurality of ribs defining a plurality of open cells, the stent body being sized to be advanced through the body lumen to a deployment site, the stent body having a stent axis extending between first and second axial ends of the stent body, the plurality of ribs having an exterior surface and an interior surface, the interior surface being configured to engage a balloon;
- and
- directing a stream of particulate at the interior surface of at least a region of the plurality of ribs to selectively remove material from the interior surface of said region to so as to substantially uniformly cover said region of said interior surface with pits approximately 3 to 20 microns in size, a surface finish of the interior surface being rougher than a surface finish of the exterior surface.
Dependencies are inferred from the claim text.