Covered stents with degradable barbs

Abstract

The present invention is directed at a removable stent for providing reinforcement to a selected region of a selected body lumen including a resilient cylindrical layer, including at least one bioresorbable extrusion exterior from the resilient cylindrical layer for resisting migration of the removable stent when the removable stent is positioned in the selected region of the selected body lumen. The present invention also includes a temporary implantable endoprosthesis which includes a tubular, radially compressible and axially flexible structure, including at least one bioresorbable extrusion exterior from the resilient cylindrical layer for resisting migration of the removable stent when the removable stent is positioned in the selected region of the selected body lumen.

1 . A removable stent for providing reinforcement to a selected region of a selected body lumen including a resilient cylindrical layer, the improvement which comprises: 
 at least one bioresorbable extrusion exterior from the resilient cylindrical layer for resisting migration of the removable stent when said removable stent is positioned in said selected region of said selected body lumen.    
     
     
         2 . The removable stent of  claim 1  wherein said extrusion is a barb.  
     
     
         3 . The removable stent of  claim 1  that is radially self-expandable.  
     
     
         4 . The removable stent of  claim 1  wherein said selected body is composed of a non-bioresorbable material.  
     
     
         5 . The removable stent of  claim 1  wherein said removable stent and said at least one extrusion are part of a unitary design.  
     
     
         6 . The removable stent of  claim 1  wherein said removable stent is a covered stent.  
     
     
         7 . The removable stent of  claim 1  wherein said removable stent is a ePTFE covered removable stent.  
     
     
         8 . The removable stent of  claim 1  wherein said at least one bioresorbable extrusion is composed of material selected from the group consisting of PGA, PLA, PEO, nylon and polyester urethane.  
     
     
         9 . A temporary implantable endoprosthesis including a tubular, radially compressible and axially flexible structure, the improvement which comprises: 
 at least one bioresorbable extrusion exterior from the resilient cylindrical layer for resisting migration of the stent when said stent is positioned in said selected region of said selected body lumen.    
     
     
         10 . The temporary implantable endoprosthesis of  claim 9  wherein said extrusion is a barb.  
     
     
         11 . The temporary implantable endoprosthesis of  claim 9  that is radially self-expandable.  
     
     
         12 . The temporary implantable endoprosthesis of  claim 9  wherein said temporary implantable endoprosthesis is made of non-bioresorbable material.  
     
     
         13 . The temporary implantable endoprosthesis of  claim 9  wherein said removable stent and said at least one extrusion are part of a unitary design.  
     
     
         14 . The temporary implantable endoprosthesis of  claim 9  wherein said removable stent is a covered stent.  
     
     
         15 . The temporary implantable endoprosthesis of  claim 9  wherein said removable stent is a ePTFE covered removable stent.  
     
     
         16 . The temporary implantable endoprosthesis of  claim 9  wherein said at least one extrusion is composed of material selected from the group consisting of PGA, PLA, PEO, nylon and polyester urethane.  
     
     
         17 . A method of reducing migration of a removable stent comprising the steps of: 
 constructing said removable stent including a resilient cylindrical layer;    placing at least one bioresorbable extrusion exterior from the resilient cylindrical layer of said removable stent on said removable stent;    positioning said removable stent in a body lumen;    expanding said removable stent within said body lumen; and    resisting migration of said removable stent by interaction between said at least one bioabsorbable extrusion and said body lumen.    
     
     
         18 . The method of  claim 17  wherein said step of placing at least one bioresorbable extrusion is performed when the removable stent is constructed as a unitary removable stent.  
     
     
         19 . The method of  claim 17  wherein said step of placing at least one extrusion is performed after the resilient cylindrical layer of said removable stent is completed.  
     
     
         20 . The method of  claim 17  wherein said step of expanding said removable stent is accomplished by including self-expanding material in the construction of said removable stent.  
     
     
         21 . The method of  claim 17  wherein said step of resisting migration is performed by forming said at least one extrusion in the shape of a barb.  
     
     
         22 . The method of  claim 17  wherein said step of resisting migration is performed by said at least one extrusion interacting with the wall of said body lumen.  
     
     
         23 . The method of  claim 17  further comprising the step of: 
 weakening said at least one extrusion by forming said extrusion of a bioabsorbable material.  
 
     
     
         24 . The method of  claim 23  wherein the step of weakening said at least one extrusion is accomplished by forming the extrusion of material selected from the group consisting of PGA, PLA, PEO, nylon and polyester urethane.