Prosthetic vascular graft

  • US 6,436,135 B1
  • Filed: 10/24/1974
  • Issued: 08/20/2002
  • Est. Priority Date: 10/24/1974
  • Status: Expired due to Term
First Claim
Patent Images

1. A prosthetic vascular structure of expanded polytetrafluorethylene having:

  • (i) a macroscopically tubular configuration with proximal and distal ends, and (ii) a microscopic superstructure of irregularly spaced nodes of various sizes and shapes interconnected by fibrils;

    said vascular structure further comprising;

    a. an average wall thickness in the range between 0.2 and 0.8 millimeters;

    b. a substantially uniform distribution of nodes throughout said tubular configuration;

    c. an average density in the range between 0.2 and 0.5 grams per milliliter; and

    d. an average distance between said nodes small enough to prevent transmural blood flow and thrombosis but no less than the maximum dimension of an average red cell;

    whereby said structure may provide for the smooth flow of blood between at least two points in a living organism while controlling cellular ingrowth through the wall of the tubular configuration to promote and nourish a thin, viable neointima over the inner surface thereof and to firmly attach said prosthetic vascular structure to adjacent tissue of said living organism.

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