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US 8,501,079 B2Granted
Controlling crystalline morphology of a bioabsorbable stent
AssigneeAbbott Cardiovascular Systems Inc.
InventorsThierry Glauser, Vincent Gueriguian, Bethany Steichen, James Oberhauser, Manish Gada, Lothar Kleiner, Mary Beth Kossuth
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Abstract
Methods to expand polymer tubing with desirable or optimum morphology and mechanical properties for stent manufacture and fabrication of a stent therefrom are disclosed.
Claims3
A method for fabricating a stent comprising:
- providing a tube made from a material comprising PLLA;
- radially and axially expanding the tube while the tube is heated to a processing temperature;
- wherein the processing temperature is 84° C. and the radial and axial expansion percentages are 400% and 20%, respectively, to produce an expanded tube having an increased strength, fracture toughness and homogeneity in a mechanical property over a wall thickness of the expanded tube;
- and
- forming the stent from the expanded tube.
2 more elements
Dependencies are inferred from the claim text.