Damping type sighting device for odontoid process of vertebra dentata

Abstract

The invention relates to medical appliances and particularly relates to a damping type sighting device for odontoid process of vertebra dentata. The sighting device is used for guiding hollow screws to be located during the treatment of fracture of the odontoid process of the vertebra dentata. The sighting device comprises a hollow guide tube and a sighting instrument which is connected onto the hollow guide tube, wherein the sighting instrument comprises an inner sleeve ring and an outer sleeve ring which are arranged in a concentric manner, the inner sleeve ring, the outer sleeve ring and the hollow guide tube are connected through cross rotating shafts, and each rotating shaft is formed through nesting an inner sleeve bar and an outer sleeve which are rotatable relatively and are arranged coaxially. The sighting device is simple in structure, convenient in use and accurate and rapid in locating and can be used for guiding Kirschner wires to be accurately located during the treatment of fracture of the odontoid process of the vertebra dentata, so that the quality of surgery is improved, faults in surgery are reduced, and the suffering of patients is reduced.

Description

technical field [0001] The invention relates to a medical instrument, in particular to a damping type pivot cone odontoid aimer used for guiding the positioning of hollow screws in the treatment of pivotal odontoid process fractures. Background technique [0002] Axial odontoid process fractures are common fractures of the cervical spine, accounting for 10% to 14% of cervical fractures. The nonunion rate of untreated or improperly treated odontoid fractures is 42-72%, and there is potential atlantoaxial instability at the same time, which may lead to acute or chronic damage to the brainstem, spinal cord or nerve roots, causing severe Quadriplegia, respiratory dysfunction, and even death. Therefore, patients with axial odontoid process fractures should be actively treated. Since the first report in 1981 that the use of screws for direct internal fixation of odontoid process fractures has been reported in clinical practice, compared with traditional treatment methods, this t...

AI Technical Summary

Problems solved by technology

However, during the operation, since there are many positions to be adjusted, and the adjustment points are interrelated, repeated adjustments are often required to meet the requirements, which affects the progress of the operation.

In addition, the length of the telescopic link adjusted by the nut is difficult to accurately measure, and the position of the telescopic link connected to the fine-tuning control panel is also uncertain. This kind of pivot bevel toothed screw sight cannot record the position with coordinate data, and cannot reproduce the previous positioning during surgery

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