Multi-layered poly(tetrafluoroethylene)/elastomer materials usef

Details Multi-layered poly(tetrafluoroethylene)/elastomer materials usef Multi-layered poly(tetrafluoroethylene)/elastomer materials usef

1987-04-28

1989-03-28

Swisher, Nancy A. B.

Stock material or miscellaneous articles

Composite

Of fluorinated addition polymer from unsaturated monomers

428422, 623 1, 623 11, 623 66, 427 2, A61F 124

Patent

active

048163392

ABSTRACT:
Biologically compatible materials capable of being formed into implants, comprising layers of poly(tetrafluoroethylene) and mixtures of poly(tetrafluoroethylene) and elastomer, having excellent compliance, strength, elasticity and suturability are disclosed. The materials are preferably prepared as implants or vascular grafts by co-extruding a relatively thin luminal layer of poly(tetrafluoroethylene) having a distinct fibral nodal microstructure within a layer of a mixture of poly(tetrafluoroethylene) and elastomer to impart elasticity to the implant. A preferred embodiment comprises a radially asymmetric composite vascular graft having a luminal layer of poly(tetrafluoroethylene), a second layer of poly(tetrafluoroethylene)/elastomer mixture, a third layer of elastomer, and a fourth layer of a monomer fibrous elastomer matrix with each layer having a distinctive pore size, pore shape and porosity to promote tissue ingrowth and periprosthetic tissue anchoring.

REFERENCES:
patent: 3527650 (1970-09-01), Block
patent: 4193138 (1980-03-01), Okita
patent: 4229838 (1980-10-01), Mano
patent: 4286341 (1981-09-01), Greer et al.
patent: 4718907 (1988-01-01), Karwoski et al.

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