Counter rotational layering of ePTFE to improve mechanical properties of a prosthesis
First Claim
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1. A prosthesis comprising:
- a first ePTFE tube in a helically twisted state oriented in a first rotational direction, wherein said first tube having been twisted from an initial state, with a first point on a first end of said first tube being longitudinally aligned along a first longitudinal reference axis with a second point on a second end of said first tube, to said helically twisted state, with at least one of said first and second points having been angularly displaced from said first longitudinal reference axis; and
, a second ePTFE tube disposed coaxially within said first tube, said second tube being in a helically twisted state oriented in a second rotational direction different from said first rotational direction, wherein said second tube having been twisted from an initial state, with a first point on a first end of said second tube being longitudinally aligned along a second longitudinal reference axis with a second point on a second end of said second tube, to said helically twisted state, with at least one of said first and second points having been angularly displaced from said second longitudinal reference axis.
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Abstract
A prosthesis, and method for forming same, are provided which includes expanded polytetrafluoroethylene (ePTFE) tubes having angularly offset node and fibril configurations. Also, the node and fibril configurations are angularly offset from the longitudinal axes of the respective tubes, providing resistance against failure in the longitudinal direction.
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Citations
7 Claims
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1. A prosthesis comprising:
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a first ePTFE tube in a helically twisted state oriented in a first rotational direction, wherein said first tube having been twisted from an initial state, with a first point on a first end of said first tube being longitudinally aligned along a first longitudinal reference axis with a second point on a second end of said first tube, to said helically twisted state, with at least one of said first and second points having been angularly displaced from said first longitudinal reference axis; and
,a second ePTFE tube disposed coaxially within said first tube, said second tube being in a helically twisted state oriented in a second rotational direction different from said first rotational direction, wherein said second tube having been twisted from an initial state, with a first point on a first end of said second tube being longitudinally aligned along a second longitudinal reference axis with a second point on a second end of said second tube, to said helically twisted state, with at least one of said first and second points having been angularly displaced from said second longitudinal reference axis. - View Dependent Claims (2)
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3. A prosthesis comprising:
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a first ePTFE tube having a node and fibril structure; and
,a second ePTFE tube disposed coaxially within said first tube, said second tube being in a helically twisted state and having a node and fibril structure, wherein said second tube having been twisted from an initial state, with a first point on a first end of said second tube being longitudinally aligned along a longitudinal reference axis with a second point on a second end of said second tube, to said helically twisted state, with at least one of said first and second points having been angularly displaced from said longitudinal reference axis, and wherein said node and fibril structure of said second tube being angularly offset from said node and fibril structure of said first tube. - View Dependent Claims (4, 5, 6, 7)
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Specification