Anterior cervical vertebra decompression trepan with automatic depth control function

Abstract

The invention discloses an anterior cervical vertebra decompression trepan with an automatic depth control function. The trepan includes an internal guide rod and an outer trepan body sleeving the internal guide rod; the outer trepan body is a hollow cavity, teeth are arranged at the lower end of the outer trepan body, a rotary handle is arranged at the upper end, and an inner thread is arranged at the upper portion of the cavity; a self-tapping thread is arranged at the lower portion of the internal guide rod, and a fine thread matched with the inner thread is arranged at the upper portion ofthe internal guide rod; the large diameter of the self-tapping thread of the internal guide rod is smaller than or equal to the inner diameter of the outer trepan body; an observation window is formed in the lower portion of the outer trepan body. Through threaded cooperation between a trepan body and a mechanical device, downward transmission of a cutting force is achieved, and only the rotary handle needs to be rotated, then cutting of a cervical vertebra can be cut off; after the trepan body penetrates through a bone substance, a fixing rod and an annular bone column in the trepan body canstay in a free state, the rotation intensity can be quickly reduced, the cutting depth of the trepan cannot be increased even if the trepan continues to rotate, a downward action force cannot be generated again, and it is ensured that medulla spinalis in a spinal canal cannot be damaged by the trepan.

Description

technical field [0001] The invention relates to the field of medical instruments, in particular to an anterior cervical decompression ring saw with automatic depth control. Background technique [0002] The trephine is a necessary instrument for the treatment of cervical spondylosis in the anterior decompression of the cervical spine. The trephine used in the prior art is a round tube with a jagged top. During the operation, the end of the trephine needs to be pressed hard, and at the same time Cutting the cervical spine with a rotary trephine is time-consuming and laborious, and the cervical spinal canal is filled with the central spinal cord, and the central spinal cord at the corresponding part of the decompression is already under compression and has clinical symptoms of varying degrees of injury, and the degree of compression has exceeded the critical value of spinal cord injury. At this time, even a slight vibration of the cervical spine will aggravate the symptoms of ...

AI Technical Summary

Problems solved by technology

During the operation, the doctor only controls the cutting depth based on experience, and cannot observe the depth position of the trephine. When the trephine cuts through the vertebral body, it is easy to enter the spinal canal under the action of inertia and damage the spinal cord nerves in the spinal canal. Cause high paralysis of patients and cause major medical accidents

In order to avoid trephine damage to the spinal cord, the common clinical method is to use a curette to scrape off the part close to the nerve after the trephine cuts to a certain extent. The operation time is prolonged, and the doctor's operation is a little careless, which may also cause the curette to slip and cause spinal injury

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