Elastomerically impregnated ePTFE to enhance stretch and recovery properties for vascular grafts and coverings
First Claim
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.
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Accused Products
Abstract
This invention relates to an elastomerically recoverable PTFE material that includes a longitudinally compressed fibrils of ePTFE material penetrated by elastomeric material within the pores defining the elastomeric matrix. The elastomeric matrix and the compressed fibrils cooperatively expand and recover without plastic deformation of the ePTFE material. This invention was used for various prosthesis, such as a vascular prosthesis like a patch, a graft and an implantable tubular stents. Furthermore, this invention discloses a method of producing the elastomerically recoverable PTFE material which include the steps of: providing the specified ePTFE, defined by the nodes and fibrils, to meet the desired end use; longitudinally compressing the fibrils of the ePTFE, the pore size sufficiently enough to permit penetration of the elastomeric material; applying the elastomeric material within the pores to provide a structurally integral elastomerically recoverable PTFE material defining an elastomeric matrix. The elastomeric material is applied to the ePTFE by dip, brush or spray coating techniques. The compression step and the application steps are interchangeable to produce the desired properties for the end use material. Finally, the elastomeric material is dried within the pores of the longitudinally compressed ePTFE to solidify the elastomeric matrix.
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Citations
21 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.
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2. A vascular prosthesis 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. - View Dependent Claims (3, 4)
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5. An implantable tubular stent graft comprising:
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(a) an ePTFE material deformed 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; 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; and
(b) compressing said fibrils longitudinally wherein said pore size is sufficient to permit penetration of elastomeric material; and
(c) 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. 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; and
(b) applying said elastomeric material to said pores; and
(c) compressing said fibrils longitudinally wherein said pore size is sufficient to permit penetration of elastomeric material pores to provide a structurally integral elastomerically recoverable PTFE material. - View Dependent Claims (15, 16, 17, 18, 19, 20, 21)
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Specification