Surface gradient cross-linking method of ultra-high molecular weight polyethylene and the application thereof
Assigneesb-ONE Medical (Suzhou) Co., Ltd., b-ONE Medical Biotech Corporation, b-ONE Ortho, Corp.
InventorZongtao Zhang
Life of this patent
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Abstract
The invention relates to a surface gradient cross-linked method of a ultra-high molecular weight polyethylene and the application thereof. The surface gradient crosslinked method of ultrahigh molecular weight polyethylene includes a n ultra-high molecular weight polyethylene surface photoinitiator diffusion step and an ultraviolet light irradiation crosslinking step. In this method, the photoinitiator is diffused deeply into the surface of ultra-high molecular weight polyethylene, the body material shows a gradient cross-linking from the surface to the inside after ultraviolet irradiation so that the whole bulk has a high toughness and the surface there of has a high wear resistance.
Claims10
An ultra-high molecular weight polyethylene medical implant, wherein the medical implant are partly or entirely made of ultra-high molecular weight polyethylene, the medical implant has at least one bearing surface layer made of ultra-high molecular weight polyethylene, wherein the at least one bearing surface layer is gradient crosslinked, the at least one bearing surface layer is super crosslinked, highly crosslinked and low-degree crosslinked in order from the surface to the inside,
- wherein an average equivalent crosslinking degree of an outermost surface layer of the at least one bearing surface layer is more than 100 kGy;
- and
- wherein an average fracture force of a 0.25 mm thick film of the outermost surface layer of the at least one bearing surface layer is greater than 50.0 Newtons.
Dependencies are inferred from the claim text.