Artificial joint with durable lubricating surface layer and preparation method of artificial joint

Abstract

The invention discloses an artificial joint with a durable lubricating surface layer. The artificial joint is composed of a substrate and a cross-linked polyelectrolyte brush layer prepared on the surface of the substrate, and the cross-linked polyelectrolyte brush layer comprises a polyelectrolyte brush layer formed on the substrate and polyelectrolyte molecules cross-linked on the polyelectrolyte brush layer. The preparation method of the joint comprises the following steps of (1) coating the surface of the substrate with an ultraviolet initiator, soaking the substrate into a grafted electrolyte monomer solution, and forming the polyelectrolyte brush layer under ultraviolet light; and (2) repeatedly and sequentially carrying out impregnation and cleaning of a first polyion electrolyte solution and impregnation and cleaning of a second polyion electrolyte solution on the substrate to form the cross-linked polyelectrolyte brush layer of which electrolyte molecules and polyelectrolyte brush molecules penetrate through each other, namely the durable lubricating surface layer. The artificial joint has a good durable lubricating effect, the lubricating service life of the polyelectrolyte brush is prolonged, the polyelectrolyte brush can still keep good tribological performance under the condition of long-term frictional wear, and the service life is prolonged.

Description

technical field

[0001] The invention relates to an artificial joint with a durable lubricating surface layer and a preparation method thereof, especially an artificial joint designed to maintain good lubricating effect under long-term friction and wear and a preparation method thereof. Background technique

[0002] Due to its good biocompatibility, corrosion resistance, fatigue resistance, etc., titanium alloys are currently commonly used replacement artificial joint materials, especially knee joint implant materials. However, its poor wear resistance limits its use as a bearing surface for artificial joints and seriously affects its service life.

[0003] There have been reports on the modification of artificial joint materials by using graft modification technology. Grafting hydrophilic acrylic acid, N,N-dimethyl-N-methacrylamidopropyl-N,N-dimethyl-N-propanesulfonic acid inner salt on the surface of titanium alloy, grafted polymer brushes The formed hydration layer effec...

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