High precision manufacture of polyurethane products such as spinal disc implants having gradual modulus variation
First Claim
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1. A method of forming a polymeric article comprising:
- injecting a first polymeric material having a first stoichiometry into a mold;
injecting a second polymeric material having a second stoichiometry into the mold; and
molding a polymeric material article having a pre-determined portion exhibiting a gradual variation in Young'"'"'s modulus.
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Abstract
A process for making a polymeric product having a gradual variation in modulus through at least a portion of the product is disclosed together with an artificial spinal disc formed using the process.
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Citations
29 Claims
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1. A method of forming a polymeric article comprising:
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injecting a first polymeric material having a first stoichiometry into a mold;
injecting a second polymeric material having a second stoichiometry into the mold; and
molding a polymeric material article having a pre-determined portion exhibiting a gradual variation in Young'"'"'s modulus. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29)
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Specification