Functional bionic artificial cervical disc

Abstract

The invention relates to a functional bionic artificial cervical disc, which comprises an upper rigid end plate, a lower rigid end plate and nucleus pulposus which is arranged between the upper rigid end plate and the lower rigid end plate, wherein a hollow ring is arranged at the outer side of the nucleus pulposus; in correspondence to the hollow ring, an upper convex part, which is perpendicularly inserted and clamped in the hollow ring, is arranged on the upper rigid end plate and a lower convex part, which is perpendicularly inserted and clamped in the hollow ring, is arranged on the lower rigid end plate; a first groove, in correspondence to a contact surface of the upper rigid end plate, is formed in the middle of the nucleus pulposus and a second groove, in correspondence to a contact surface of the lower rigid end plate, is formed in the middle of the nucleus pulposus; a first boss is arranged on the upper rigid end plate, and correspondingly, a second boss is arranged on the lower rigid end plate; and a transition layer is arranged between the nucleus pulposus and the upper rigid end plate and a transition layer is arranged between the nucleus pulposus and the lower rigid end plate. The artificial cervical disc provided by the invention is capable of doing activities of rotation, inflexion-extension and lateral bending within a three-dimensional space by six degrees of freedom, so as to achieve movement functions of normal cervical disc in a human body; and in addition, the functional bionic artificial cervical disc is excellent in biomechanic adaptability.

Description

technical field [0001] The invention relates to a functional bionic artificial cervical intervertebral disc, which belongs to the technical field of medical implantable orthopedic medical instruments. Background technique [0002] Cervical spine disease is a common and frequently-occurring disease. According to statistics, there are 50 million patients with cervical spine disease in my country. With the aging process and the accelerated pace of modern life, the incidence of cervical disc disease in my country is increasing year by year. In the surgical treatment of cervical disc disease, artificial cervical disc replacement is considered to be a very cutting-edge and effective treatment method. This method replaces the original intervertebral disc and makes it function by implanting a movable device in the intervertebral space. , to achieve the preservation of the movement function of the cervical spine, while providing the stability required by the cervical spine, preventin...

AI Technical Summary

Problems solved by technology

At present, most of the cervical intervertebral disc prosthesis adopts ball and socket sliding structure design, such as the intervertebral disc prosthesis disclosed in patents CN 102648879 A, ​​CN 101961270 A, etc. The mechanical properties of this hard support are different from the perfect structure and mechanical properties of the human cervical intervertebral disc It is large and not elastic, and it cannot protect the cervical spine well when it is shocked, and there is a certain risk of wear debris during long-term use, which will affect the surrounding tissues

The human cervical intervertebral disc is essentially an elastic structure. Obviously, the traditional hard-supported sliding friction structure cannot well simulate the structure and activity characteristics of the human cervical intervertebral disc.

In recent years, some elastic artificial intervertebral disc prostheses have been studied, but there are still some problems. On the one hand, it is still difficult to avoid the generation of friction debris. A big difference

The clinical application of many types of artificial cervical intervertebral disc products shows that after replacing the diseased human cervical intervertebral disc with artificial cervical intervertebral disc, good therapeutic effect can be achieved. After being implanted into the human body, the range of motion of the cervical spine of the implanted segment will increase significantly, and the stress on the adjacent facet joints and ligaments will increase. After a long period of implantation, the incidence of heterotopic ossification of the implanted segment will increase. high

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