COMPRESSION-DISTRACTION APPARATUS (VERSIONS) Russian patent published in 2006 - IPC A61B17/60 

FIELD: medical equipment; traumatology.

SUBSTANCE: compression-distraction apparatus has to be structural member of device used for through-bone fixation of bone fragments. According to the first version, apparatus has two girders made of braces and rings provided with needles. Girders are connected together by means of compression-distraction members made in form threaded studs provided with adjusting screws. Studs are connected with girders by means of insertions which are fastened to girders in cantilever in perpendicular to studs. One insertion of any connection of girder is made resilient and s provided with resistance strain gauges connected into bridge circuit for connection to controller. According to the second version, apparatus has two girders composed of braces and rings provided with needles. Girders are connected together by means of compression-distraction members provided with threaded stud connected tightly with one girder. At least three longitudinal grooves are made onto stud. Grooves have balls to be inserted into separator outside which separator the bushing is put onto balls. Bushing is tightly connected with the other girder. One side of bushing contacts with adjusting nut and the other its side contacts with second adjusting nut via spring. Studs and bushings are tightly connected with girders by means of insertions which are attached in cantilever onto girders in perpendicular to studs. One insertion in any connection is made resilient and is provided with resistance strain gauges which are connected into bridge circuit for connection to controller.

EFFECT: digital visualization of compression and distraction processes; improved precision of reposition, compression load and gap between fragments.

2 cl, 3 dwg