Cervical intervertebral disc prosthesis, implant device, combination device of cervical intervertebral disc prosthesis and implant device, and method for implanting cervical vertebra implant into cervical spine

Abstract

The invention relates to a cervical vertebra shoulder disc prosthesis, an implanting device, a device composed of the cervical vertebra shoulder disc prosthesis and the implanting device and a method for implanting the cervical vertebra implant into the cervical spine. The device comprises a cervical shoulder disc prosthesis and an implant instrument, the cervical intervertebral disc prosthesis is composed of an upper endplate, a 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 The interference fit is a cylindrical fitting structure; the implanted instrument is composed of a clamping rod, a sleeve, a rotating handle and a stop pin. The clamping rod is empty in the sleeve, and the stop pin prevents any Relatively rotating, rotating the rotating handle screwed at the end of the clamping rod to promote the relative axial movement of the clamping rod and the sleeve embedded in the fitting groove of the rotating handle at the end, when the axial movement of the clamping rod, the sleeve squeezes the clip The clamping head of the holding rod realizes loosening and clamping of the prosthesis through the 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, Prestige LP, 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 is not suitable Chinese 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-1 306 064 describes an implant device under an intervertebral disc pr...

AI Technical Summary

Problems solved by technology

EP-A-1 306 064 describes an implant device under an intervertebral disc prosthesis system. The prosthesis is not provided with a clamping hole. Instead of the hole, the implant device has two pairs of grasping parts rigidly connected to each other. An endplate is held in between by friction, which can lead to unreliable implantation for implants that need to be 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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