Caped stent

Abstract

An intravascular stent having a stent body and at least one cover overlying the stent body to cover the first portion of the stent body. The cover has a first region attached to the stent body and a second region unattached to the stent body. Multiple covers can be attached to the stent body in overlapping arrangement, each cover having a free unattached end. The free ends reduce the overall stiffness of the stent.

1 - 23 . (canceled) 
     
     
         24 . An intravascular stent positionable within a vessel of a patient comprising:
 a) an outer layer composed of a woven material; and   b) an inner layer positioned within the outer layer, the inner layer composed of an expanding material and movable from a collapsed condition to an expanded condition to facilitate expansion of the outer layer within the vessel.   
     
     
         25 . The intravascular according to  claim 24 , wherein the inner layer is attached to the outer layer and inserted together into a patient's body. 
     
     
         26 . The intravascular stent according to  claim 24 , wherein the inner layer has a porosity greater than the porosity of the outer layer. 
     
     
         27 . The intravascular stent according to  claim 26 , wherein the porosity of the inner layer is greater than about 80%. 
     
     
         28 . The intravascular stent according to  claim 24 , where the outer layer has a first length and the inner layer has a second length, and the first length is equal to the second length. 
     
     
         29 . The intravascular stent according to  claim 24 , where the outer layer has a first length and the inner layer has a second length, and the first length is different than the second length. 
     
     
         30 . The intravascular stent according to  claim 24 , further comprising a first cover attached to one or both of an outer wall or inner wall of the outer layer to cover a first portion of the outer layer and extending longitudinally over the first portion, the first cover having a first region and an unattached region, the unattached region having a free end, the first cover attached at the first region to reduce porosity of the inner layer. 
     
     
         31 . The intravascular stent according to  claim 30 , further comprising a second cover attached to one or both of an outer wall or inner wall of the outer layer and extending longitudinally over a second portion, the second cover having a first region and an unattached region, the unattached region of the second cover having a free end, wherein the first cover overlaps the first region of the second cover and a free end of the second cover is not overlapped by the first cover, and the free ends of the first and second covers are axially spaced. 
     
     
         32 . The intravascular stent according to  claim 25 , further comprising a first cover attached to one or both of inner wall or outer wall of the inner layer, the cover extending longitudinally, the first cover having a first region and an unattached region, the unattached region having a free end, the first cover attached to the inner wall at the first region. 
     
     
         33 . The intravascular according to  claim 32 , further comprising a second cover attached to one or both of inner wall or outer wall of the inner layer, the second cover having a first region and an unattached region, the unattached region of the second cover having a free end, wherein the first cover overlaps the first region of the second cover and the free end of the second cover is not overlapped by the first cover. 
     
     
         34 . The intravascular stent according to  claim 24 , further comprising hydrogel adhered to one or both of the inner layer or outer layer. 
     
     
         35 . The intravascular stent according to  claim 24 , further comprising a cover attached to the inner or outer wall of the inner or outer layer and a hydrogel is adhered to one or more of the cover, inner layer or outer layer. 
     
     
         36 . The intravascular stent according to  claim 24 , wherein the inner layer is inserted into the outer layer after the outer layer is positioned within a patient's body. 
     
     
         37 . The intravascular stent according to  claim 36 , wherein the inner layer has a porosity greater than the porosity of the outer layer. 
     
     
         38 . The intravascular stent according to  claim 37 , wherein the porosity of the inner layer is greater than about 80%. 
     
     
         39 . The intravascular stent according to  claim 36 , where the outer layer has a first length and the inner layer has a second length, and the first length is equal to the second length. 
     
     
         40 . The intravascular stent according to  claim 36 , where the outer layer has a first length and the inner layer has a second length, and the first length is different than the second length. 
     
     
         41 . The intravascular stent according to  claim 36 , further comprising a) a first cover attached to one or both of inner wall or outer wall of the outer layer to cover the first portion of the outer layer and extending longitudinally over the first portion, the first cover having a first region and an unattached region, the unattached region having a free end, the first cover attached to the outer layer at the first region to reduce porosity of the inner layer and b) a second cover attached to one or both of an outer wall or inner wall of the outer layer and extending longitudinally over the second portion, the second cover having a first region and an unattached region, the unattached region of the second cover having a free end, wherein the first cover overlaps the first region of the second cover and a free end of the second cover is not overlapped by the first cover, and the free ends of the first and second covers are axially spaced. 
     
     
         42 . The intravascular stent according to  claim 36 , further comprising a) a first cover attached to one or both of inner wall or outer wall of the inner layer, the cover extending longitudinally, the first cover having a first region and an unattached region, the unattached region having a free end, the first cover attached to the inner wall at the first region and b) a second cover attached to one or both of inner wall or outer wall of the inner layer, the second cover having a first region and an unattached region, the unattached region of the second cover having a free end, wherein the first cover overlaps the first region of the second cover and the free end of the second cover is not overlapped by the first cover. 
     
     
         43 . The intravascular stent according to  claim 36 , further comprising a cover over one of the inner layer or outer layer and a hydrogel adhered to one or more of the inner layer outer layer or cover.