Controlled ingrowth feature for antimigration

Abstract

A tubular prosthesis that includes a scaffolding formed by at least one scaffolding filament; a cover; and at least one controlled ingrowth feature constructed and arranged to abut an inner surface of a lumen wall when the prosthesis is implanted in the body lumen.The controlled ingrowth feature may extend inwards or outwards from the prosthesis outer surface. The controlled ingrowth feature may be formed by a scaffolding filament; by a separate filament; by the cover; and combinations thereof

What is claimed is: 
     
         1 . A stent, comprising:
 a tubular scaffolding having an outer surface and an inner surface defining a lumen extending therethrough, wherein the tubular scaffolding is configured to radially expand from a delivery configuration to a deployed configuration; and   a protruding element extending radially outward from the outer surface in the deployed configuration;   wherein the tubular scaffolding is formed from at least one filament interwoven about a central longitudinal axis of the stent;   wherein the protruding element is formed from a portion of the at least one filament.   
     
     
         2 . The stent of  claim 1 , further comprising a cover secured to the tubular scaffolding. 
     
     
         3 . The stent of  claim 2 , wherein the tubular scaffolding includes a plurality of scaffold openings extending through the tubular scaffolding from the outer surface to the inner surface and the cover spans at least some of the plurality of openings. 
     
     
         4 . The stent of  claim 2 , wherein the cover is configured to prevent tissue ingrowth into the lumen. 
     
     
         5 . The stent of  claim 1 , wherein protruding element is configured to engage a wall of a body lumen when the tubular scaffolding is in the deployed configuration within the body lumen. 
     
     
         6 . The stent of  claim 1 , wherein the protruding element defines a gap between the protruding element and the outer surface. 
     
     
         7 . The stent of  claim 1 , wherein the protruding element defines a maximum radial extent measured radially outward from the outer surface, the maximum radial extent being in a range of about 0.25 millimeters to about 4 millimeters. 
     
     
         8 . The stent of  claim 7 , wherein the range of the maximum radial extent is about 0.5 millimeters to about 2 millimeters. 
     
     
         9 . The stent of  claim 1 , wherein the protruding element is oriented non-parallel to the central longitudinal axis of the stent. 
     
     
         10 . A stent, comprising:
 a tubular scaffolding having an outer surface and an inner surface defining a lumen extending therethrough, wherein the tubular scaffolding is configured to radially expand from a delivery configuration to a deployed configuration; and   a plurality of protruding elements extending radially outward from the outer surface in the deployed configuration;   wherein the tubular scaffolding is formed from at least one filament interwoven about a central longitudinal axis of the stent;   wherein each of the plurality of protruding elements is formed from the at least one filament.   
     
     
         11 . The stent of  claim 10 , wherein the plurality of protruding elements is disposed between a first end of the tubular scaffolding and a second end of the tubular scaffolding opposite the first end. 
     
     
         12 . The stent of  claim 10 , wherein the plurality of protruding elements is configured to engage a wall of a body lumen when the tubular scaffolding is in the deployed configuration within the body lumen. 
     
     
         13 . The stent of  claim 12 , wherein the plurality of protruding elements permits tissue ingrowth between the plurality of protruding elements and the outer surface when engaged with the wall of the body lumen. 
     
     
         14 . The stent of  claim 12 , wherein the plurality of protruding elements is configured to prevent axial migration of the stent within the body lumen in the deployed configuration. 
     
     
         15 . The stent of  claim 10 , further comprising a cover extending along at least a portion of the tubular scaffolding to prevent tissue ingrowth into the lumen. 
     
     
         16 . A stent, comprising:
 a tubular scaffolding having an outer surface and an inner surface defining a lumen extending therethrough, wherein the tubular scaffolding is configured to radially expand from a delivery configuration to a deployed configuration; and   a protruding element extending radially outward from the outer surface in the deployed configuration;   wherein the tubular scaffolding is formed from at least one filament interwoven about a central longitudinal axis of the stent;   wherein the protruding element is formed from a separate filament distinct from the at least one filament forming the tubular scaffolding.   
     
     
         17 . The stent of  claim 16 , further comprising a cover extending along at least a portion of the tubular scaffolding to prevent tissue ingrowth into the lumen. 
     
     
         18 . The stent of  claim 16 , wherein the separate filament is oriented parallel to one or more of the at least one filament. 
     
     
         19 . The stent of  claim 16 , wherein the separate filament is secured to the tubular scaffolding. 
     
     
         20 . The stent of  claim 16 , wherein the separate filament is interwoven into the tubular scaffolding.