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Method of making envelope for tissue expander

  • US 5,035,249 A
  • Filed: 10/20/1989
  • Issued: 07/30/1991
  • Est. Priority Date: 12/17/1987
  • Status: Expired due to Fees
First Claim
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1. A method of making an envelope for a tissue expander having a single means for inflation, said method comprising the steps of:

  • (a) applying a first fluid elastomeric polymer composition, capable of forming a first cohesive elastic layer stretchable to at least about 50% of its unstretched length, to less than the entire surface of a mandrel, leaving at least one section of the mandrel surface free of said first composition and capable of forming another cohesive layer thereon;

    (b) applying a second fluid elastomeric polymer composition, capable of forming a second elastic layer stretchable to at least about 50% of its unstretched length, to selected other sections of the mandrel surface free of said first composition, so that the mandrel surface is substantially entirely covered with said fluid compositions;

    (c) applying a third fluid polymeric composition at least partially covering said second composition, said third composition being capable of forming a third cohesive elastic layer; and

    (d) forming said first, second and third cohesive layers from said applied elastomeric compositions into a seamless three-dimensional envelope, said first and third layers each having a modulus of elasticity greater than said second layer, such that one area of said envelope has a greater modulus of elasticity than a surrounding area, allowing the envelope to assume a complex shape.

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