Anti-migration stent

Abstract

An illustrative stent includes an elongated tubular member comprising at least one strut or filament forming a tubular wall having a plurality of cells extending through a thickness of the tubular wall. The elongated tubular member may be configured to move between a radially collapsed configuration and a radially expanded configuration. A coating is disposed on the elongated tubular member and spanning the plurality of cells. The coating forms a pocket within at least some of the cells of the plurality of cells and extends radially inward of the tubular wall to define a void. In some instances, a partition or wall is positioned within at least some of the pockets and transects the void.

What is claimed is: 
     
         1 . A stent, the stent comprising:
 an elongated tubular member comprising at least one strut forming a tubular wall having a plurality of cells extending through a thickness of the tubular wall, the elongated tubular member configured to move between a radially collapsed configuration and a radially expanded configuration; and   a coating disposed on the elongated tubular member and spanning the plurality of cells, the coating forming a pocket within at least some of the plurality of cells and extending radially inward of the tubular wall to define a void;   wherein the pockets are truncated pyramidal shaped, with four converging side walls and a radially inward base wall intersecting each of the four converging side walls;   wherein a radially outward facing surface of the base wall is spaced radially inwardly of a radially innermost extent of the tubular wall.   
     
     
         2 . The stent of  claim 1 , further comprising a partition positioned within at least some of the pockets, each partition extending radially outward from the radially outward facing surface of the base wall of its respective pocket and transecting the void. 
     
     
         3 . The stent of  claim 2 , wherein at least some of the partitions extend generally perpendicular to a central longitudinal axis of the elongated tubular member. 
     
     
         4 . The stent of  claim 2 , wherein at least some of the partitions extend generally parallel to a central longitudinal axis of the elongated tubular member. 
     
     
         5 . The stent of  claim 2 , wherein at least some of the partitions extend at an oblique angle relative to a central longitudinal axis of the elongated tubular member. 
     
     
         6 . The stent of  claim 2 , wherein a height of the partitions is approximately equal to a height of the at least one strut having the coating disposed thereon. 
     
     
         7 . The stent of  claim 2 , wherein the at least one strut forms a plurality of cross-over points. 
     
     
         8 . The stent of  claim 7 , wherein at least some of the partitions extend between adjacent cross-over points. 
     
     
         9 . The stent of  claim 2 , wherein at least one pocket includes two or more partitions. 
     
     
         10 . The stent of  claim 2 , wherein the coating and the partitions are formed as a single monolithic structure. 
     
     
         11 . The stent of  claim 1 , wherein the coating defines an entirety of a surface of a lumen extending longitudinally through the stent. 
     
     
         12 . The stent of  claim 1 , wherein at least some of the pockets include an aperture formed therethrough. 
     
     
         13 . A stent, the stent comprising:
 an elongated tubular member comprising at least one strut forming a tubular wall having a plurality of cells extending through a thickness of the tubular wall, the elongated tubular member configured to move between a radially collapsed configuration and a radially expanded configuration; and   a coating disposed on the elongated tubular member and spanning the plurality of cells, the coating forming a pocket within at least some of the plurality of cells and extending radially inward of the tubular wall to define a void;   wherein the pockets have a rhombus shaped cross-section, with four flat side walls intersecting a base wall;   wherein a radially outward facing surface of the base wall is spaced radially inwardly of a radially innermost extent of the tubular wall.   
     
     
         14 . The stent of  claim 13 , further comprising a partition positioned within at least some of the pockets, each partition extending radially outward from the radially outward facing surface of the base wall of its respective pocket and transecting the void. 
     
     
         15 . The stent of  claim 13 , wherein the coating and the partitions are formed as a single monolithic structure. 
     
     
         16 . The stent of  claim 13 , wherein at least some of the pockets include an aperture formed therethrough. 
     
     
         17 . A stent, the stent comprising:
 an elongated tubular member comprising at least one strut forming a tubular wall having a plurality of cells extending through a thickness of the tubular wall, each of the plurality of cells having a cross-sectional shape, the elongated tubular member configured to move between a radially collapsed configuration and a radially expanded configuration; and   a coating disposed on the elongated tubular member and spanning the plurality of cells, the coating forming a pocket within at least some of the plurality of cells and extending radially inward of the tubular wall to define a void;   wherein the pockets each have a cross-sectional shape that is the same as the cross-sectional shape of the plurality of cells, the pockets each including four converging side walls and a radially inward base wall intersecting each of the four converging side walls;   wherein a radially outward facing surface of the base wall is spaced radially inwardly of a radially innermost extent of the tubular wall.   
     
     
         18 . The stent of  claim 17 , wherein the cross-sectional shape of the plurality of cells is a diamond shape. 
     
     
         19 . The stent of  claim 17 , further comprising a partition positioned within at least some of the pockets, each partition extending radially outward from the radially outward facing surface of the base wall of its respective pocket and transecting the void. 
     
     
         20 . The stent of  claim 17 , wherein at least some of the pockets include an aperture formed therethrough.