Elastomerically impregnated ePTFE to enhance stretch and recovery properties for vascular grafts and coverings
First Claim
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1. An elastomerically recoverable PTFE material comprising:
- (a) an ePTFE material defined by nodes and fibrils, said fibrils being in longitudinally compressed state and defining pores of a size sufficient to permit penetration of an elastomeric material; and
(b) an elastomeric matrix within said pores;
said compressed fibrils and elastomeric matrix cooperatively permitting longitudinal expansion and elastomeric recovery without plastic deformation of said ePTFE material, wherein said elastomeric matrix is a polycarbonate urethane material having a shore hardness rating between 70A and 75 D.
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Abstract
An elastomerically recoverable PTFE material is provided including a longitudinally compressed fibrils of ePTFE material penetrated by elastomeric material within the pores defining the elastomeric matrix. The elastomeric matrix and the compressed fibris cooperatively expand and recover without plastic deformation of the ePTFE material. The material may be used for various prosthesis, such as a vascular a prosthesis like a patch, a graft and an implantable tubular stent. Further, a method of producing the elastomerically recoverable PTFE material is provided herein.
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Citations
14 Claims
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1. An elastomerically recoverable PTFE material comprising:
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(a) an ePTFE material defined by nodes and fibrils, said fibrils being in longitudinally compressed state and defining pores of a size sufficient to permit penetration of an elastomeric material; and
(b) an elastomeric matrix within said pores;
said compressed fibrils and elastomeric matrix cooperatively permitting longitudinal expansion and elastomeric recovery without plastic deformation of said ePTFE material, wherein said elastomeric matrix is a polycarbonate urethane material having a shore hardness rating between 70A and 75 D. - View Dependent Claims (2, 3, 4)
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5. An implantable tubular stent graft comprising:
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(a) an ePTFE material defined by nodes and fibrils, said fibrils being in longitudinally compressed state and defining pores of a size sufficient to permit penetration of an elastomeric material;
(b) an elastomeric matrix within said pores;
said compressed fibrils and elastomeric matrix cooperatively permitting longitudinal expansion and elastomeric recovery without plastic deformation of said ePTFE material, wherein said elastomeric matrix is a polycarbonate urethane material having a shore hardness rating between 70A and 75 D; and
(c) a longitudinally expandable stent.
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6. A method of producing an elastomerically recoverable PTFE structure comprising the steps of:
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(a) providing an ePTFE material defined by nodes, fibrils and pores, wherein said pore size is a space defined by the distance between said nodes and distance between said fibrils;
(b) providing an elastomeric material, said elastomeric matrial is a polycarbonate urethane material having a shore hardness rating between 70A and 75 D;
(c) compressing said fibrils longitudinally wherein said pore size is sufficient to permit penetration of said elastomeric material; and
(d) applying said elastomeric material within said pores to provide a structurally integral elastomerically recoverable PTFE material. - View Dependent Claims (7, 8, 9, 10, 11, 12, 13)
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14-21. -21. (canceled)
Specification