Jaw tractor with self-locking function

Abstract

The invention relates to a jaw tractor with a self-locking function. The jaw tractor is characterized in that the jaw tractor comprises a traction frame provided with a guiding groove, a first plug provided with a containing cavity and fixed to the rear end in the guiding groove, a fixed traction plate fixed to the traction frame and provided with first mounting holes, a second plug fixed to the front end in the guiding groove, a movable traction seat provided with a threaded through hole and constrained in the guiding groove, a movable traction plate provided with second mounting holes and fixed to the movable traction seat, a screw rod provided with a first annular blocking shoulder, and a self-locking spring, wherein the screw rod is arranged in the guiding groove and can rotate aroundthe axis of the screw rod, the rear end of the screw rod is movably inserted in the containing cavity, the screw rod penetrates through and is connected into the threaded through hole in a threaded mode, the self-locking spring is arranged in the containing cavity and acts on the rear end face of the screw rod, thus the screw rod keeps forward moving, and then the first annular blocking shoulder has the tendency of compressing the inner end face of the second plug. According to the jaw tractor, the screw rod is not prone to self-rotating in the osteogenesis traction process.

Description

technical field [0001] The invention belongs to the technical field of medical instruments used in oral cavity, jaw surgery and plastic surgery, and in particular relates to a jaw retractor with self-locking function. Background technique [0002] At present, there is a special retractor for the jaw, which is widely used in oral and maxillofacial or cranial surgery and plastic surgery. After truncation or incomplete truncation, external force is used to gradually spread the broken ends of the bone to form a gap, and the traction force is used to induce the osteogenesis ability of the jaw itself to continuously form new bone to fill the gap and achieve the purpose of lengthening the mandible. This technology utilizes the tissue regeneration potential of the body to repair bone defects or deformities caused by various congenital or acquired reasons. [0003] Such as the Chinese utility model patent "A Jawbone Traction Extender" with the patent number ZL95200175.6 (the announc...

AI Technical Summary

Problems solved by technology

[0004] The existing jaw retractor has the following defects. Because the adjustment handle is exposed, and after the traction is over, the stretched jaw itself will have a certain restoring force. If the outside world accidentally touches the drive handle or is affected by vibration, the screw will be loosened. Generally, two retractors are used to pull the jaw together. If the traction position of one of the retractors changes, it will lead to uneven traction of the jaw, and the gap between the broken bones will shift, eventually resulting in new fractures. Bone formation jagged, seriously affecting the quality of surgery

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