Cervical disc prosthesis, implantable device, cervical disc prosthesis and implantable device combination device and method of implanting cervical implant to cervical vertebra

Abstract

The invention relates to cervical disc prosthesis, an implantable device, a cervical disc prosthesis and implantable device combination device and a method of implanting a cervical implant to cervical vertebra. The combination device comprises the cervical disc prosthesis and the implantable device, wherein the cervical disc prosthesis is composed of an upper endplate, nucleus pulposus and a lower endplate, the upper endplate and the nucleus pulposus form a ball and socket joint, and the nucleus pulposus and the lower endplate are in interference fit to form a cylinder fitting structure; the implantable device is composed of a clamping rod, a sleeve, a rotation handle and a stop pin, the clamping rod is sleeved inside the sleeve in an empty mode, the stop pin prevents relative rotation between the clamping rod and the sleeve, the rotation handle in rotation bolted connection onto the tail end of the clamping rod promotes relative axial movement generated between the clamping rod and the sleeve whose tail end is embedded inside the rotation handle fitting groove, the sleeve squeezes the clamping head of the clamping rod in the case of axial movement of the clamping rod, and relaxation and clamping of the prosthesis are realized through opening and closing of the clamping head.

Description

technical field [0001] The invention relates to the field of orthopedic implants, in particular to a cervical intervertebral disc prosthesis, an implant instrument, a combination device of the cervical intervertebral disc prosthesis and the implant instrument, and a method for implanting the cervical spine implant into the cervical spine. Background technique [0002] Cervical intervertebral disc prosthesis has Bryan, PrestigeLP, Prodisc-C, CerviCore, Mobi-C, Discover and other products, but the main performance parameters of these products are designed based on the bone size of foreign populations, which are not suitable for China Population bone size. [0003] It is difficult for the cervical intervertebral disc prosthesis itself to reach the designated implantation position. In order to accurately implant the cervical intervertebral disc prosthesis, corresponding implantation instruments are needed. EP-A-1306064 describes an implant device under the intervertebral disc p...

AI Technical Summary

Problems solved by technology

EP-A-1306064 describes an implant device under the intervertebral disc prosthesis system, the prosthesis is not provided with a clamping hole, the implant device has two pairs of grasping parts rigidly connected to each other instead of holes, each of which passes through the Friction holds an endplate, which can lead to unreliable implantation for implants that are used in the cervical spine and very small implants that must be positioned very precisely

[0004] CN1822803A and CN1822804A respectively disclose "device composed of neck prosthesis and implanted instrument" and "implanted instrument for neck prosthesis". For the clamping and loosening of the prosthesis, although this pliers-shaped design can save space and be used in narrow areas such as the neck and spine, it also has shortcomings. The degree of clamping of the prosthesis is only through the user's own feeling. It is easy to cause loose clamping, the position of the prosthetic parts changes during the operation, or the clamping is too tight, causing a certain degree of damage to the prosthesis

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