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US 7,682,386 B2Granted
Counter rotational layering of ePTFE to improve mechanical properties of a prosthesis
AssigneeBoston Scientific Scimed, Inc.
InventorJamie S. Henderson
Life of this patent
Estimating the term…
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.
Claims13
A composite prosthesis comprising:
- a first seamless extruded ePTFE tube having a node and fibril structure;
- a second seamless extruded ePTFE tube positioned concentrically about said first ePTFE tube, the second seamless extruded ePTFE tube having a node and fibril structure;
- and
- only one of said first and second ePTFE tubes being in a helically twisted state oriented in a first rotational direction, and having been twisted from an initial untwisted state to said helically twisted state,
- wherein the node and fibril structure of said first seamless tube is angularly offset from the node and fibril structure of the second ePTFE tube.
2 more elements
A prosthesis comprising:
- a first seamless extruded ePTFE tube having a node and fibril structure;
- a second seamless extruded ePTFE tube positioned concentrically about said first ePTFE tube, the second seamless extruded ePTFE tube having a node and fibril structure;
- and
- one of said first and second seamless extruded ePTFE tubes being in a helically twisted state with a first amount of twisting and having been twisted from an initial untwisted state,
- the other of said first and second seamless extruded ePTFE tubes not having said first amount of twisting,
- wherein the node and fibril structure of said first seamless extruded ePTFE tube is angularly offset from the node and fibril structure of the second seamless extruded ePTFE tube.
3 more elements
Dependencies are inferred from the claim text.