Wrist joint prosthesis with surface hydroxyapatite HA modified microporous titanium

Abstract

The invention discloses a wrist joint prosthesis with surface hydroxyapatite HA modified microporous titanium. The wrist joint prosthesis comprises a hemispherical cup, a radial handle, a movable hemisphere, a carpal bone platform and a metacarpal bone fixing handle. Titanium alloy (Ti6Al4V) is used as a material and is integrally manufactured in a laser 3D printing mode, the surface is covered with an HA coating through a plasma spraying technology, the HA coating can ensure that calcium and phosphorus ions are slowly released around the prosthesis, so that cell osteogenic differentiation is promoted, better bone ingrowth is achieved, the problem that middle and long-term prostheses are prone to loosening is solved, and the prosthesis has a good application prospect. Meanwhile, the HA coating can enable the surface of the prosthesis to become rough and can also be coated with an anti-infection coating, so that the prosthesis has antibacterial ability, and the problem that infection is likely to occur in the early stage of replacement is solved; the surface of the prosthesis is designed to be conical circular rings stacked layer by layer, friction force is increased, anti-pullout performance is improved, the surfaces of the radius assembly, the carpal assembly and screws on the two sides are all provided with HA coatings, and therefore better osseointegration is achieved.

Description

technical field [0001] The invention belongs to the field of joint prosthesis replacement, in particular to a wrist joint prosthesis with surface hydroxyapatite HA modified microporous titanium. Background technique [0002] The wrist joint is composed of four interrelated joints, the radiocarpal joint, the distal radioulnar joint, the middle wrist joint, and the carpus metacarpal joint. It is one of the more complex joints in the human body. The realization of hand functions depends on these four joints. However, the wrist joint is also a frequent site of many orthopedic diseases and traumas, such as rheumatoid arthritis, osteoarthritis, suppurative arthritis, traumatic arthritis, etc.; when the wrist joint functions due to these diseases When the hand function is completely lost and the hand function cannot be realized, wrist joint replacement is required; wrist joint replacement uses artificial joint prosthesis to replace the radiocarpal and middle wrist joints on the aff...

AI Technical Summary

Problems solved by technology

[0003] The current wrist prosthesis mainly has the following shortcomings: the wrist prosthesis is prone to loosening, sinking, and bone absorption around the prosthesis in the medium and long term; the soft tissue around the wrist joint is thin, and infection is prone to occur in the early postoperative period, resulting in wrist joint damage. Replacement failure; the main indication for wrist joint replacement is advanced wrist joint disease in rheumatoid arthritis. It has been reported in the literature that the probability of postoperative infection in patients with rheumatoid arthritis is 2-3 times that of patients without rheumatoid arthritis. Widely used wrist prostheses do not have antibacterial function, so postoperative infection is easy

[0004] 1) After the metacarpal fixation stem and radial stem of the prosthesis are implanted in the medullary cavity of the metacarpal and radius, there is no gripping force and the stability is poor; 2) Some wrists with barbed structures are designed on the metacarpal fixation stem and radial stem Although the joint prosthesis solves the problem of grasping the medullary cavity during implantation and increases the stability, it does not consider that if the patient has infection or other conditions, the prosthesis needs to be temporarily removed, so the barb structure is being removed at this time. During the process, it is bound to cause scratches to the tissue in the medullary cavity, making it difficult to remove the prosthesis

Images