Tubular polytetrafluoroethylene implantable prostheses
First Claim
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1. A process of preparing an expanded polytetrafluoroethylene (e-PTFE) tubular prosthesis having a microporous wall structure including nodes, internodal spaces and fibrils interconnecting said nodes wherein said internodal spaces have been impregnated with a solid, insoluble biocompatible material, comprising the steps of:
- preparing a dispersion or solution of a soluble biocompatible, biodegradable material including extracellular matrix proteins selected from the group consisting of collagen, gelatin, vitronectin, fibronectin, laminin, reconstituted basement membrane matrices and mixtures thereof at an acidic pH;
contacting said prosthesis with said dispersion or solution to impregnate said internodal spaces with said soluble biocompatible material;
increasing the pH of said dispersion or solution to precipitate out said soluble biocompatible, biodegradable material to render it into an insoluble state, whereby said internodal spaces are substantially filled with said insoluble biocompatible, biodegradable material.
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Abstract
An implantable prosthesis comprising an expanded polytetraethylene member having pores present in its wall structure wherein said pores contain a solid insoluble biocompatible, biodegradable material of natural origin. A process of preparing said prostheses is also disclosed.
125 Citations
8 Claims
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1. A process of preparing an expanded polytetrafluoroethylene (e-PTFE) tubular prosthesis having a microporous wall structure including nodes, internodal spaces and fibrils interconnecting said nodes wherein said internodal spaces have been impregnated with a solid, insoluble biocompatible material, comprising the steps of:
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preparing a dispersion or solution of a soluble biocompatible, biodegradable material including extracellular matrix proteins selected from the group consisting of collagen, gelatin, vitronectin, fibronectin, laminin, reconstituted basement membrane matrices and mixtures thereof at an acidic pH; contacting said prosthesis with said dispersion or solution to impregnate said internodal spaces with said soluble biocompatible material; increasing the pH of said dispersion or solution to precipitate out said soluble biocompatible, biodegradable material to render it into an insoluble state, whereby said internodal spaces are substantially filled with said insoluble biocompatible, biodegradable material. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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Specification