Single-side and double-side spine and lumbar vertebra damping zygopophysis prosthesis

Abstract

The single-side and double-side spine and lumbar vertebra damping articular process prosthesis comprises one or a pair of prosthesis devices which are the same in structure and opposite in direction, and each prosthesis device comprises an upper fixing part, a lower fixing part, a ball-and-socket joint device and a damping device; wherein the upper fixing part is fixed to the inclined upper portion of the ball-and-socket joint device, the damping device is connected to the bottom of the ball-and-socket joint device, and the lower fixing part is fixed to one side of the damping device. According to the invention, the prosthesis device can be selectively fixed at one side or two sides according to the actual condition of a patient. In conclusion, due to the small size, the damage is small, meanwhile, the flexibility and the damping performance are effectively improved through the ball-and-socket joint device and the damping device, the operation steps in the operation are well simplified through the integrated structure, only screws are needed for up-down fixing, and the operability is good.

Description

technical field [0001] The invention belongs to the technical field of orthopaedic spinal surgery implants, in particular to a unilateral and bilateral spinal lumbar shock absorbing facet joint prosthesis. Background technique [0002] The intervertebral discs and the paired facet joints in a single segment of the spine are often collectively referred to as a triarticular complex. as true synovial joints such as figure 1 As shown, each facet joint is composed of the superior articular process with the inferior vertebral body facing the posterolateral side and the inferior articular process and the joint capsule with the superior vertebral body facing the anteromedial side. The shape and orientation of this facet joint determines that its main function is to prevent the spine Excessive exercise while transmitting and taking part of the stress. The facet joints of the lumbar spine tend to be oriented sagittal, which can limit the axial rotation of the spine, but reduce the l...

AI Technical Summary

Problems solved by technology

However, there are still some defects in the design of the current facet joint prosthesis, including: 1. Large volume: not only the facet joints on both sides of the diseased segment need to be removed, but also the spinous process and surrounding ligaments of the corresponding segment need to be removed. 2. Complicated use: There are many structural parts in the design, and the screw needs to be tightened several times during the operation to assemble, which is not convenient for operation; 3. Poor mobility: the whole is connected and fixed by metal and other materials , focusing on stabilizing the posterior structure of the lumbar spine, but the design of the range of motion is not enough to meet the natural conditions, and the movement is relatively limited; 4. Single function: the design of the prosthesis structure and function is relatively simple, it cannot restore the three-joint complex, and cannot restrict excessive exercise or to help relieve stress

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