Interface-friction-free artificial intervertebral disc and forming method thereof

Abstract

The invention relates to an interface-friction-free artificial intervertebral disc and a forming method thereof. The interface-friction-free artificial intervertebral disc is composed of an upper rigid end plate, a lower rigid end plate, an elastic nucleus pulposus arranged between the upper rigid end plate and the lower rigid end plate and a membrane arranged on the outer side of the elastic nucleus pulposus. The elastic nucleus pulposus is made from two or more polyurethane materials different in elasticity modulus, and the polyurethane materials different in elasticity modulus are connected together. During forming, an upper rigid end plate-polyurethane material workpiece, a lower rigid end plate-polyurethane material workpiece are prepared firstly, and finally the middle is filled with the polyurethane material low in elasticity modulus to achieve connection of the upper and lower workpieces. The interface-friction-free artificial intervertebral disc is of an integrated structure and achieves physiological activities in all directions through elastic deformation of the elastic nucleus pulposus when being subject to a load.

Description

technical field [0001] The invention relates to an artificial intervertebral disc without interface friction and a molding method thereof, belonging to the technical field of medical implantable orthopedic medical devices. Background technique [0002] The intervertebral disc is the main component of the spinal motion segment. Its main function is to produce special limited activities between two adjacent vertebral bodies, absorb and buffer shocks with the help of the elasticity of the nucleus pulposus and the special structure of the fibrous annulus. Since the launch of the first generation of intervertebral disc prosthesis - ball joint prosthesis, ball and socket prosthesis, arch prosthesis, articular disc prosthesis and hard endplate-hard nucleus prosthesis have been developed successively, which can better Prostheses that meet the biomechanical requirements of the human body. However, most of these prostheses basically give up the requirement for elasticity and focus on ...

AI Technical Summary

Problems solved by technology

On the one hand, this kind of hard-supported ball-and-socket structure is not elastic, and cannot protect the cervical spine well when it is shaken; organizations that have an impact on

The C-type prosthesis does not contain articular surfaces, and its mobility is mainly achieved through the elastic deformation of the nucleus pulposus material. This type of prosthesis also includes a load attenuation function, but there are still a large number of interfaces between the nucleus pulposus and the endplate, as disclosed in the patent US8377138B2 A C-shaped prosthesis, which fixedly connects the elastomeric nucleus pulposus material to the rigid endplate through traditional mechanical fitting and other connection methods. Although a certain connection has been achieved, the elastomeric nucleus pulposus material and the metal rigid endplate The plate will have interface problems, and there will also be a displacement interface between the endplate components. During the long-term use of the implant in the body, problems such as material wear, heat generation, and shedding may still occur due to repeated friction

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