Bifurcated vascular stent and methods of manufacture
Bifurcated endovascular prostheses used to treat diseased blood vessels, such as arteries, are disclosed. In some embodiments, the bifurcated endovascular prosthesis is configured to be implanted within the diseased blood vessels adjacent a diseased section. The bifurcated endovascular prosthesis includes a primary stent graft and a secondary stent graft. The primary stent graft includes a pocket or sleeve disposed within a bore. A proximal portion of the secondary stent graft is disposed within the pocket or sleeve. Blood flow through the bifurcated endovascular prosthesis is divided into two flows, a first flow through the primary stent graft and a second flow through the secondary stent graft.
1 . A method of manufacturing a bifurcated endovascular prosthesis, comprising:
constructing a primary stent graft construct, comprising:
obtaining a pocket mandrel and a first body mandrel;
covering the pocket mandrel with a first polymeric covering;
disposing the covered pocket mandrel within a groove of the first body mandrel;
covering the covered pocket mandrel and the first body mandrel with a second polymeric covering; and
constructing a secondary stent graft construct, comprising:
obtaining a second body mandrel; and
covering the second body mandrel with a third polymeric covering.
2 . The method of claim 1 , wherein constructing the primary stent graft construct further comprises forming an opening in the first polymeric covering and the second polymeric covering adjacent a distal end of the pocket mandrel.
3 . The method of claim 2 , wherein constructing the primary stent graft further comprises:
winding a first wire around a plurality of winding pins of a primary wire stent mandrel to form a primary wire stent, wherein an area of the primary wire stent is void of the first wire;
disposing the primary wire stent over the covered pocket and body mandrels, wherein an area void of the first wire is disposed adjacent the opening; and
covering the primary wire stent with a fourth polymeric covering.
4 . The method of claim 3 , wherein constructing the primary stent graft construct further comprises sintering the primary stent graft.
5 . The method of claim 1 , wherein construction of the secondary stent graft further comprises:
winding a second wire around a plurality of winding pins of a secondary wire stent mandrel to form a secondary wire stent;
disposing the secondary wire stent over the covered second body mandrel; and
covering the secondary wire stent with a fifth polymeric covering.
6 . The method of claim 5 , wherein constructing the secondary stent graft construct further comprises sintering the secondary stent graft.
7 . The method of claim 1 , wherein covering the pocket mandrel with the first polymeric covering includes any one of wrapping strips of material around the pocket mandrel, serially depositing material onto the pocket mandrel, dipping the pocket mandrel into a solvent based polymer solution, and spraying the pocket mandrel with a solvent based polymer solution.
8 . The method of claim 1 , wherein covering the covered pocket mandrel and the body mandrel with the second polymeric covering includes any one of wrapping strips of material around the pocket mandrel, serially depositing material onto the pocket mandrel, dipping the pocket mandrel into a solvent based polymer solution, and spraying the pocket mandrel with the solvent based polymer solution.
9 . The method of claim 1 , wherein covering the second body mandrel with the third polymeric covering includes any one of wrapping strips of material around the pocket mandrel, serially depositing material onto the pocket mandrel, dipping the pocket mandrel into a solvent based polymer solution, and spraying the pocket mandrel with a solvent based polymer solution.
10 . The method of claim 3 , wherein covering the primary stent with the fourth polymeric covering includes any one of wrapping strips of material around the pocket mandrel, serially depositing material onto the pocket mandrel, dipping the pocket mandrel into a solvent based polymer solution, and spraying the pocket mandrel with a solvent based polymer solution.
11 . The method of claim 5 , wherein covering the secondary stent with the fifth polymeric covering includes any one of wrapping strips of material around the pocket mandrel, serially depositing material onto the pocket mandrel, dipping the pocket mandrel into a solvent based polymer solution, and spraying the pocket mandrel with a solvent based polymer solution.
12 . The method of claim 1 , wherein a distal end of the pocket mandrel comprises a surface having an angle ranging from 30 degrees to 90 degrees relative to a longitudinal axis of the pocket mandrel.
13 . A method of manufacturing a primary stent graft of a bifurcated endovascular prosthesis comprising constructing a primary stent graft construct, comprising:
obtaining a pocket mandrel and a body mandrel;
covering the pocket mandrel with a first polymeric covering;
disposing the covered pocket mandrel within a groove of the body mandrel;
covering the covered pocket mandrel and the body mandrel with a second polymeric covering; and
forming an opening in the first polymeric covering and the second polymeric covering adjacent a distal end of the pocket mandrel.
14 . The method of claim 13 , wherein constructing the primary stent graft further comprises:
winding a wire around a plurality of winding pins of a primary wire stent mandrel to form a primary wire stent, wherein an area the primary wire stent is void of the wire;
disposing the primary wire stent over the covered pocket and body mandrels, wherein the area void of the wire is disposed adjacent the opening; and
covering the primary wire stent with a third polymeric covering.
15 . The method of claim 14 , wherein constructing the primary stent graft construct further comprises sintering the primary stent graft construct at 385 degrees C.
16 . The method of claim 13 , wherein covering the pocket mandrel with the first polymeric covering includes any one of wrapping strips of material around the pocket mandrel, serially depositing material onto the pocket mandrel, dipping the pocket mandrel into a solvent based polymer solution, and spraying the pocket mandrel with a solvent based polymer solution.
17 . The method of claim 13 , wherein covering the covered pocket mandrel and the body mandrel with the second polymeric covering includes any one of wrapping strips of material around the pocket mandrel, serially depositing material onto the pocket mandrel, dipping the pocket mandrel into a solvent based polymer solution, and spraying the pocket mandrel with a solvent based polymer solution.
18 . The method of claim 14 , wherein covering the primary stent with the third polymeric covering includes any one of wrapping strips of material around the pocket mandrel, serially depositing material onto the pocket mandrel, dipping the pocket mandrel into a solvent based polymer solution, and spraying the pocket mandrel with a solvent based polymer solution.
19 . The method of claim 13 , wherein the pocket mandrel comprises any one of a circular cross-sectional shape, an elliptical cross-sectional shape, and a cross-sectional D-shape.