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Pleated composite ePTFE/textile hybrid covering

  • US 7,510,571 B2
  • Filed: 08/19/2003
  • Issued: 03/31/2009
  • Est. Priority Date: 06/11/2001
  • Status: Expired due to Fees
First Claim
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1. A composite multilayer implantable material comprising:

  • a first inner tubular layer formed of expanded polytetrafluoroethylene having a porous microstructure defined by nodes interconnected by fibrils, wherein said first layer has a plurality of pleated folds, each of said pleated folds forming a masked portion under said pleated folds;

    a second tubular layer formed of textile material circumferentially disposed exteriorly to said first layer, wherein said first and second layers are secured to each other by an elastomeric bonding agent positioned along a contacting layer of said first and second layers; and

    wherein said masked portion of each of said pleated folds is not secured to said second layer by said bonding agent to permit unfolding and longitudinal lengthening of said composite multilayer implantable material.

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