Covered stent

Abstract

A covered stent, including a proximal end surface, a distal end surface and a peripheral surface located between the proximal end surface and the distal end surface, the peripheral surface including an inner surface and an outer surface. The outer surface is covered with a first coating membrane, and the inner surface is covered with a second coating membrane. The covered stent further includes a stent main body, which is between the first coating membrane and the second coating membrane. At least one of two ends of the first coating membrane and the second coating membrane fold inward or outward so as to wrap at least one from among the proximal end surface and the distal end surface.

1 . A covered stent, comprising: a proximal-end end surface, a distal-end end surface and a peripheral surface located between the proximal-end end surface and the distal-end end surface, the peripheral surface comprising an inner surface and an outer surface opposite to the inner surface; the outer surface is covered with a first coating membrane, and the inner surface is covered with a second coating membrane;
 the covered stent further comprising a stent main body arranged between the first coating membrane and the second coating membrane; wherein at least one of two ends of the first coating membrane and the second coating membrane are folded one of inwards or outwards so as to cover at least one of the proximal-end end surface and the distal-end end surface.   
     
     
         2 . The covered stent according to  claim 1 , wherein the two ends of the first coating membrane and the second coating membrane are folded towards the inner surface and are connected with the second coating membrane through the stent main body. 
     
     
         3 . The covered stent according to  claim 1 , wherein the two ends of the first coating membrane and the second coating membrane are folded towards the outer surface and are connected with the first coating membrane through the stent main body. 
     
     
         4 . The covered stent according to  claim 1 , wherein the first coating membrane and the second coating membrane are made of a PET membrane or PTFE membrane. 
     
     
         5 . The covered stent according to  claim 1 , wherein the stent main body is cut and expanded from a biocompatible plastic expansion material tubular. 
     
     
         6 . A membrane covering method of the covered stent according to  claim 2 , comprising:
 S 1 , covering the outer surface of the covered stent with a first coating membrane, and covering the inner surface with a second coating membrane;   S 2 , thermally treating the covered stent covered with the coating membranes so as to adhere the first coating membrane and the second coating membrane;   S 3 , after the coating membranes are cooled, cutting two ends of the first coating membrane and the second coating membrane to required lengths;   S 4 , folding the two ends of the first coating membrane and the second coating membrane towards the inner surface; and   S 5 , thermally treating the first coating membrane and the second coating membrane which are folded towards the inner surface so as to adhere the folded coating membranes with the second coating membrane.   
     
     
         7 . A membrane covering method of the covered stent according to  claim 3 , comprising:
 S 1 , covering the outer surface of the covered stent with a first coating membrane, and covering the inner surface with a second coating membrane;   S 2 , thermally treating the covered stent covered with the coating membranes so as to adhere the first coating membrane and the second coating membrane;   S 3 , after the coating membranes are cooled, cutting two ends of the first coating membrane and the second coating membrane to required lengths;   S 4 , folding the two ends of the first coating membrane and the second coating membrane towards the outer surface; and   S 5 , thermally treating the first coating membrane and the second coating membrane which are folded towards the outer surface so as to adhere the folded coating membranes with the first coating membrane.