Plastic and nonmetallic article shaping or treating: processes – Direct application of electrical or wave energy to work – Microwave
Reexamination Certificate
2008-04-29
2008-04-29
Berman, Susan W. (Department: 1796)
Plastic and nonmetallic article shaping or treating: processes
Direct application of electrical or wave energy to work
Microwave
C264S494000, C522S161000, C526S352000, C623S023580
Reexamination Certificate
active
07364685
ABSTRACT:
The invention relates to a method of manufacturing implant parts made of highly cross-linked polyethylene, wherein a blank made of ultra-high-molecular-weight polyethylene is irradiated with ionizing radiation in order to produce radicals in the blank. To optimize the cross-linkage of the highly cross-linked polyethylene and to eliminate free radicals, the blank is subsequently treated by means of microwave radiation and/or ultrasound in such a way that free radicals, which have not recombined, are excited so as to ensure substantially complete recombination of the free radicals. The shape of the treated blank can then be adjusted by means of machining. The invention further relates to implant parts for application in human medicine that have been manufactured as described above.
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Berman Susan W.
Knobbe Martens Olson & Bear LLP
Plus Orthopedics AG
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