Double Ring Pivot Bevel Dent Sight

Abstract

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. It includes a hollow guide tube and an aiming device connected to the hollow guide tube, the aiming device includes an inner collar and an outer collar arranged concentrically, and the inner collar, the outer collar and the hollow guide tube are connected by a crossed rotating shaft , the rotating shaft is made of an inner casing and an outer casing that are relatively rotatable and coaxially arranged. The aimer has the advantages of simple structure, convenient use, accurate and rapid positioning, and can be used to guide accurate positioning of Kirschner wires in the treatment of axial odontoid process fractures, thereby improving operation quality, reducing operation errors, and reducing patient's pain.

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