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.