05980799 is referenced by 30 patents and cites 111 patents.

A method of forming porous articles with a varying pore distribution by extrusion from a billet with a varying lubricant distribution. A single-polymer polytetrafluoroethylene is extruded and then stretched and sintered to provide a differential porous PTFE structure composed of fibers and nodes connected to one another by these fibers. The microfibrous structure has a portion within the cross-section that possesses a different pore size, accompanied by a different node and fiber geometry, than adjacent areas within that cross section. In a vascular graft, the pores taper inwardly, providing a fluid-tight lumen wall structure that prevents leakage, yet promotes cellular ingrowth and natural tissue regeneration. A node structure of radially-oriented plates provides flexibility, suture strength, and enhanced protection against collapse.

Title
Methods of making controlled porosity expanded polytetrafluoroethylene products and fabrication
Application Number
850862
Publication Number
5980799
Application Date
June 16, 1998
Publication Date
November 9, 1999
Inventor
Steve A Herweck
Nashua
NH, US
Theodore Karwoski
Hollis
NH, US
Paul Martakos
Pelham
NH, US
Agent
Lahive & Cockfield
Assignee
Atrium Medical Corporation
NH, US
IPC
B29C 55/22
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