DEVICE AND METHOD OF BLOCKED EXTERNAL OSTEOSYNTHESIS OF CONDYLAR FRACTURES OF LONG BONES Russian patent published in 2017 - IPC A61B17/80 A61B17/56 

FIELD: medicine.

SUBSTANCE: device for blocked external osteosynthesis of condylar fractures of long bones includes a plate, cancellous and cortical screws. The plate is made longitudinally curved in shape of the synthesized condyle and narrowed to the end along the length with the upper edge twice as wide as the lower one, with pointed lateral edges and tooth cutting along the edges for contact with the bone, with holes made top-down first in two transverse rows: in the top row with three, and in the bottom row with two. Between the two holes of the second row there is a hole for Kirschner's wire. The end holes of the first row of the plate are cut at an angle of 10° to the sides, and the average one is perpendicular to the plate, without thread. The two holes of the second row of the plate are cut at an angle of 10° to the sides. One longitudinal row of holes running along the top of the plate, which are cut alternately left-and-right at an angle of 10°, is located along the center of the plate curvature downward with an indent to a certain distance from the transverse ones. On the upper half of the plate thickness, the holes are made cone-shaped with a conical screw thread, and the other half of the plate thickness is smooth with diametre providing a passage, creating a tight contact in the threadless part of the screw. The cortical screw is made with a tapered thread under the cap on the half of the head, coincides with a similar thread of the upper half of the plate thickness. When screwing the screw bears against the edges of the plate hole and protrudes beyond its lower edge, and the length of the screw consists of the following: the screw cap, the thickness of the plate at an angle and 2 mm of deviation from the plate, and the diametre of the bone revealed on the X-ray diffraction pattern. The upper screws are cancellous, and the lower ones are cortical - without threads on their body, which is cut only at the end of the rod by 1/3 of the length. The method of blocking osteosynthesis of metaphysial fractures of long bones consists in repositioning and fixing bone fragments and in using a plate which is placed on the fracture site. The fragments are reduced and the Kirschner's wire is inserted through the hole for the wire. Then, a hole is drilled in a bone through the middle hole of the plate of the upper row and the plate is fixed, and then the screws are inserted into the side holes of the upper row in the plate, then the screws of the second row are inserted, and when confirming the correct position of the fragments, the screws are inserted into the diaphyseal part of the damaged bone, the Kirchner's wire is removed.

EFFECT: inventions provide the reliable fixation, minimum contact of the plate and bone surface, eliminating a risk of bed sores and disturbed repair process, simplifying the fixation procedure.

2 cl, 7 dwg