A Posterior Cervical Internal Fixation Apparatus for Reduction of Skull Base Depression

Abstract

The invention relates to a posterior occipitocervical internal fixation appliance for basilar impression reposition. The posterior occipitocervical internal fixation appliance comprises an angle-adjustable occipital cervical fixing rod, an epistropheus reposition screw system and at least two occipital bone reposition screw systems, wherein the epistropheus reposition screw system comprises an epistropheus reposition screw and a first connecting part; each occipital bone reposition screw system comprises an occipital bone reposition screw and a second connecting part; each of the first connecting part and the second connecting part comprises a screw seat, a tubular element and a locking mechanism; the angle-adjustable occipital cervical fixing rod is accommodated in the tubular element; the locking mechanism limits the relative movement of the angle-adjustable occipital cervical fixing rod and the tubular element; and each screw seat for installing the epistropheus reposition screw is rotationally connected with the corresponding tubular element. The posterior occipitocervical internal fixation appliance has the advantages that the occipital cervical angle is corrected through rotating the epistropheus reposition screw at the sagittal plane, so that the sufficient and direct reposition force can be provided; the occipital cervical angle correction angle can be precisely controlled; the angle of the occipital cervical fixing rod can be conveniently set and regulated; and through the quantitative unidirectional strutting correction dislocation between two points, the correction degree of the atlantoaxial transverse and longitudinal dislocation can be precisely controlled.

Description

technical field [0001] The invention relates to the technical field of medical devices, in particular to a posterior cervical internal fixation device for reduction of skull base depression. Background technique [0002] Skull basilar depression is a relatively common occipitocervical deformity, and patients are often accompanied by obvious atlantoaxial dislocation and abnormal sequence of upper cervical spine. There are two main types of atlantoaxial dislocations in patients with basilar depression: lateral dislocation caused by the posterior movement of the odontoid process and longitudinal dislocation caused by the upward movement of the odontoid process. The upward and backward compression of the spinal cord by the dislocated odontoid process is the pathological mechanism that causes clinical symptoms; therefore, effective reduction of the lateral and longitudinal dislocations of the atlantoaxial spine during basilar depression surgery is the key to obtaining satisfactor...

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Problems solved by technology

[0004] The patent document (CN203291002U) discloses an internal fixation device for atlantoaxial dislocation reduction, but it cannot accurately control the correction angle of the occipital-cervical angle, and it is inconvenient to set and adjust the angle of the occipital-cervical fixation rod, and cannot accurately correct the atlantoaxial Lateral or longitudinal vertebral dislocation with limited ability to correct the dislocation

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