Elastic piece damping type dual-ring odontoid sighting device

Abstract

The invention relates to a medical instrument, in particular to a elastic piece damping type dual-ring odontoid sighting device used for leading a hollow screw to be located in odontoid fracture treatment. The elastic piece damping type dual-ring odontoid sighting device comprises a hollow guide tube and a sighting device body connected to the hollow guide tube. The sighting device body comprises an inner lantern ring and an outer lantern ring which are concentrically arranged, the inner lantern ring, the outer lantern ring and the hollow guide tube are connected through crossed rotating shafts, and each rotating shaft is formed by being provided with an inner sleeve rod and an outer sleeve tube in a sleeving mode, wherein the inner sleeve rod and the outer sleeve tube can be rotated relatively and are concentrically arranged. The sighting device is simple in structure, convenient to use, accurate and quick in locating and can be used for leading a kirschner wire to be accurately located in odontoid fracture treatment, thereby improving operation quality, reducing operation errors and alleviating pains of a patient.

Description

technical field [0001] The invention relates to a medical device, in particular to a shrapnel damping type double-ring pivot cone odontoid collimator used for guiding the positioning of a hollow screw 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 tr...

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