HYBRID ENDOFIXATOR WITH AN ADJUSTABLE INTERBODY ELEMENT (VERSIONS) AND A DEVICE FOR ITS ADJUSTMENT AND INSTALLATION Russian patent published in 2020 - IPC A61F2/44 

FIELD: medicine.

SUBSTANCE: group of inventions relates to medical equipment, specifically to neurosurgery, in particular to an implanted hybrid endofixator with an adjustable interbody element and a device for its adjustment and installation, and can be used in treating cervical spine diseases and injuries. Hybrid endofixator with adjustable interbody element includes a bent plate with holes for screws, contains two side shafts located on the plate and a screw of the stop plate. On each side shaft with proximal to the plate side is movable relative to the shaft is a front roller, and from the distal rear roller, besides, the locking plate screw is screwed into the stop plate, where the rear rollers rest against, and on the side shafts there are splines intended for adjustment of the rollers. In compliance with second version, hybrid endofixator with adjustable interbody element comprises bent plate with holes for screws, comprises a head on the plate, crowned with connected to two front rollers on their sides and a hollow shaft connected by crown connection to the front roller, having internal thread, through the heads and the shaft locking screws screwed into threaded channels of the rolls are passed, Besides, on heads and heads of lock screws there are splines for adjustment of rollers. In the third version, the hybrid endofixator with an adjustable interbody element includes a bent plate with holes for screws, contains two side shafts located on the plate and a screw of the stop plate. On each side shaft with distal side relative to the plate there is a rear roller, and on the screw of the stop plate proximal to the plate there is an unpaired ventral roller, besides, a locking plate is fixed on the screw of the retaining plate, in which the rear rollers rest, and on the heads of the ventral roller, shafts of the dorsal rolls and the screw of the stop plate, there are splines for adjusting the rollers. Device for adjustment and installation of the above endofixator includes a plate and a hollow rod installed inside the plate, as well as two pair of side switches. Each pair of side switches is located on side of plate at some distance on different sides of rod, besides, on side of docking with endofixator, pairs of side keys are close to rod. Inside the hollow rod there are also two keys, on the side of docking with the endofixator, the ends of the keys are made so that they fit tightly with splines on the endofixator rollers, besides, on the side of docking with the endofixator there are collets connected to the bushing through rod bars, and also between the bushing and the plate there is a spring on the rod.

EFFECT: use of inventions makes it possible to change the height of an interbody element in its different parts to achieve optimal dimensions for more stable fixation and correction of spinal deformations.

11 cl, 12 dwg