Process for producing a new class of ultra-high-molecular-weight polyethylene orthopaedic prostheses with enhanced mechanical properties
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United States of America Patent
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Jul 9, 1991
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N/A
app pub date -
Mar 17, 1989
filing date -
Mar 17, 1989
priority date (Note) -
Expired
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Abstract
A method for producing an UHMWPE product with enhanced planar mechanical properties. An initial UHMWPE semicrystalline morphology is solid-state deformed under compression in a mold including a mold cavity with an unenclosed perimeter zone or a perimeter zone with a reservoir enabling flow-through for molded UHMWPE. A polymer preform is oriented and extended in more than one direction in the mold cavity and the perimeter zone to an extent which is limited by the material properties of the polymer under the employed processing conditions. The oriented and extended UHMWPE is cooled under compression to ambient temperature for maintaining the maximum orientation and extension attained during the solid-state deformation process. The polymer product in the mold cavity is separated from the product in the perimeter zone of the mold cavity. The UHMWPE product has a markedly transformed morphology, as compared with the initial UHMWPE morphology. The product comprises oriented and extended molecular chains in more than one direction and exhibits markedly enhanced mechanical properties in more than one direction, the magnitude depending on the extent of deformation.
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