Multizone implants
First Claim
1. A fixation device comprising at least two homogeneous degradation zones fabricated from polymeric materials that are not reinforced with ceramic or particulate fillers, the at least two homogeneous degradation zones including a first degradation zone having a first degradation rate and a second degradation zone having a second degradation rate that is different from the first degradation rate, and an interphase providing a gradient or gradual transition between the first degradation zone and the second degradation zone,wherein a region of the interphase closer to the first homogeneous degradation zone comprises more of the polymeric material of the first degradation zone than a region of the interphase closer to the second homogeneous degradation zone.
2 Assignments
0 Petitions
Accused Products
Abstract
Medical devices having more than one degradation zone or degradation mechanism are used for orthopedic repair devices and soft tissue fixation devices.
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Citations
15 Claims
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1. A fixation device comprising at least two homogeneous degradation zones fabricated from polymeric materials that are not reinforced with ceramic or particulate fillers, the at least two homogeneous degradation zones including a first degradation zone having a first degradation rate and a second degradation zone having a second degradation rate that is different from the first degradation rate, and an interphase providing a gradient or gradual transition between the first degradation zone and the second degradation zone,
wherein a region of the interphase closer to the first homogeneous degradation zone comprises more of the polymeric material of the first degradation zone than a region of the interphase closer to the second homogeneous degradation zone.
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15. A fixation device comprising at least two homogeneous degradation zones fabricated from polymeric materials that are not reinforced with ceramic or particulate fillers, the at least two homogeneous zones including a first degradation zone comprising a copolymer having a first ratio of monomers and a second degradation zone comprising the copolymer at a second ratio of monomers that is different from the first ratio of the first degradation zone, and an interphase providing a transition between the first degradation zone and the second degradation zone, wherein a region of the interphase proximal to the first homogeneous degradation zone comprises a ratio of monomers of the copolymer closer to the first ratio of the copolymer of the first degradation zone and a region of the interphase proximal to the second homogeneous degradation zone comprises a ratio of monomers of the copolymer closer to the second ratio of the second degradation zone.
Specification