Endomed, Inc.

Barbara L Teeter

William M Colone

William L Creer

Kevin G Farl

Joseph B Sinnott

Peter Y Lee

A method is disclosed for making vascular prostheses from ePTFE said prostheses having a diameter which is larger, and a wall thickness which is smaller than previously achievable using ram extrusion techniques. The method consists of extruding a PTFE tube, finish processing the tube into an ePTFE tube, laterally dilating it by expansion in incremental steps, calendering the tube after each dilating step, while the tube is being maintained at an elevated temperature. Once the tube is dilated it can be sintered with another tube to form a laminate. Alternatively, a wire stent may be joined with one or more tubes, thereby biasing the laminate to a cylindrical configuration.

Method of making large diameter vascular prostheses and vascular prosthesis made by said method

Expandable vascular prosthesis

An intraluminal device such as a stent graft is formed of a conformable ePTFE tube and preferably a compressed self-expanding stent affixed to the tube. The conformable tube is made by a special process which insures that the tube is radially deformable up to a predetermined diameter without exceeding the plastic deformation limit of the tube. The stent has a relaxed diameter larger than the diameter of the expanded tube after insertion so that the tube is biased to a cylindrical shape. The process for making the tube involves progressively dilating a small diameter extruded tube until a desired diameter is achieved. The tube is then contracted on a small diameter mandrel by heating.

Balloon-assisted intraluminal stent graft

Method of making large diameter vascular prosteheses and a vascular prosthesis made by said method

A device for disposing a radially self-expanding endoprosthesis in a body lumen. The implantation device includes an elongated catheter having a distal end and an outer surface over which the endoprosthesis is placed a sheath disposed to releasably surround at least a portion of the endoprosthesis, holding the endoprosthesis on the catheter in a radially contracted state, and a flexible elongation release element cooperating with the sheath. The sheath is released, permitting the surrounded portion of the endoprosthesis to expand, by axial withdrawal of the release element.

Delivery system for self-expanding stents and grafts

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Tempe, AZ, United States of America

Barbara L Teeter