Double-ring type pivot cone odontoid sighting device

Abstract

The invention relates to a medical instrument, in particular to a double-ring type pivot cone odontoid sighting device for guiding hollow screw locating in pivot cone odontoid fracture treatment. The double-ring type pivot cone odontoid sighting device comprises a hollow guiding pipe and a sighting device connected to the hollow guiding pipe. The sighting device comprises an inner sleeve ring and an outer sleeve ring which are arranged concentrically. The inner sleeve ring, the outer sleeve ring and the hollow guiding pipe are connected through cross rotating shafts. The rotating shafts are formed by inner sleeve pipes and outer sleeve pipes in a sleeved mode, and the inner sleeve pipes and the outer sleeve pipes can rotate relatively and are arranged coaxially. The sighting device is simple in structure, convenient to use and accurate and quick in locating, the device can be used for guiding a Kirschner wire to be located accurately in pivot cone odontoid fracture treatment, accordingly, operation quality is improved, operation errors are reduced, and the pain of a patient is lowered.

Description

technical field [0001] The invention relates to a medical instrument, in particular to a double-ring 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, th...

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

Images