Surgical instrument for operation of anterior fenestrated spondylodessis in vertebral osteochondrosis

Claim 1

THE EMBODIMENTS OF THE INVENTION IN WHICH AN EXCLUSIVE PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS: 10. A surgical instrument for the operation of anterior fenestral spondylodesis in vertebral osteochondrosis, compris-ing: a hollow elongated cylindrical body; a handle secured on the rear end of said body transversally thereto; a detachable hollow cylindrical cutter with a cutting edge, secured on the front end of said body coaxially therewith and intended for the simultaneous excision of two transplants in the shape of cylindrical segments from the bodies of two adjacent verte-brae; a shaft situated in said body coaxially therewith and freely rotatable and movable longitudinally; a detachable knife situated in the cavity of said cutter and secured on the end of said shaft for movement jointly therewith, whose blades lie in a plane parallel to the plane of the cutting edge of the cutter, and whose size is so selected as to ensure the introduction of the knife into the intervertebral slit following the removal of an intervertebral disk and the comple-te undercutting of said transplants after their excision by said cutter, upon subsequent rotation of the knife; a device for locking said shaft relative to the aforementioned body in a position whereby the cutting edge of the cutter and the blades of the knife lie in approximately the same plane, while preventing the shaft's rotation relative to the body; a limit flange, secured on said shaft and situated within the cavity of said cutter at a distance from the blades of said knife, equal to the required height of the transplants being excised and intended for coming in contact with the surface of said adjacent vertebral bodies and thereby restricting the depth of the knife's descent into the intervertebral slit; a stop situated on the rear end of said body, interacting with the end of said shaft during its longitudinal movement towards the rear end of the body and ensuring thereby, together with said limit flange, a preset depth of penetration of the cutter into the adjacent vertebral bodies.