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US20070043443A1 High precision manufacture of polyurethane products such as spinal disc implants having gradual modulus variation 审中-公开

High precision manufacture of polyurethane products such as spinal disc implants having gradual modulus variation
摘要：
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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