COMPRESSION ROD APPARATUS FOR LONG BONE REDUCTION Russian patent published in 2012 - IPC A61B17/66 

FIELD: medicine.

SUBSTANCE: invention refers to medicine, namely traumatology and orthopaedics. A compression rod apparatus for long bone reduction comprises threaded bearing rods with a threaded portion longitudinally movable with the use of axial movement screw nuts of a tube body with distal and proximal axial deflection assemblies arranged on the body in mutually perpendicular cavities with transosseous rod holders and transosseous rods fixed therein. The apparatus additionally has a spacer ring 1 with proximal 2 and distal 3 hinged joints arranged on both end thereof. The proximal hinged joint 2 is fixed with the use of an O-ring groove 4 and a retaining screw 5 on the proximal end 1-P of the spacer ring 1 with the proximal hinged joint 2 rotating about an axis of the spacer ring 1. The distal hinged joint 3 is arranged on a distal smooth end 1-D of the spacer ring 1 with the distal hinged joint 3 rotating about the spacer ring 1 and movable along the spacer ring 1 and further rigid fixation thereon in a required position with the use of a clamping bolted assembly with a screw 6. The proximal hinged joint 2 and the distal hinged joint 3 are identical and consisting of a body 9 and a loop 10 coupled by a connecting axis 7 with a collar 8. The body 9 is rigidly fixed on a short end 7A of the connecting axis 7 with the use of a pin 11, while the pin 10 is arranged on the other end of the connecting axis 7 rotating and rigidly fixed in the required position with the use of the clamping bolted assembly with the screw 6. Each body 9 has a hole 12 for placing and further rigid fixation in the required position with the use of the clamping bolted assembly with the screw 6 of the proximal threaded bearing rod 13 or the distal threaded bearing rod 14, as well as a hole 15 perpendicular to the hole 12 for placing a short end 7A of the connecting axis 7 of the proximal hinged joint 2 or the distal hinged joint 3. Each loop 10 has a hole 16 for placing and further rigid fixation in the required position with the use of the clamping bolted assembly with the screw 6 of the proximal end 1-P or the distal end 1-D of the spacer ring 1. An axis of the hole 16 is perpendicular to an axis connecting the axis 7 of the hinged joint, as well as there is a hole 30 for placing and further rigid fixation in the required position with the use of the clamping bolted assembly with the screw 6 of the other end of the connecting axis 7. The tube body 17 of the distal threaded bearing rod 13 or the proximal threaded bearing rod 14 comprises small holders 18 of transosseous rods 19 and extensions 20 with placed grasping forceps 21 of the transosseous rod 19. The grasping forceps 21 are movable along the extension rod 20 and further fixation in the required position with the use of the clamping bolted assembly with the screw 6. The transosseous rods 19 are placed in the small holder 18 and the grasping forceps 21 by a second hole 22 a diameter of which matches with an external diameter of the transosseous rod 19, the axis of which are perpendicular to the axis of the tube body 17. The transosseous rods 19 are placed in the hole 22 movable and rigidly fixed in the small holder body 18 and the grasping forceps 21 with the use of screw nuts 23. The second hole 22 is created from one side from the basic hole 27 of the small holder 18. On the opposite side of the small holder 18 there is an opening slot of the clamping bolted assembly with the screw 6. The holder body of the grasping forceps 21 comprises a hole 28 a diameter of which matches with an external diameter of the tube body 17. The tube body 17 of the proximal threaded bearing rod 13 and the distal threaded bearing rod 14 comprises an additionally arranged stop ring 24 of rigid fixation in the pre-set position of a slide tube 17 on the threaded bearing rod 13 or 14 with the use of a lock bolt 26 through a hole 30 in the tube body 17 after pre-set movement of the tube body 17 along the proximal threaded bearing rod 13 and the distal threaded bearing rod 14 with the use of screw nuts 29 of axial movement of the tube body 17. A wall of the stop ring 24 has various walls and comprises a threaded hole 25 for placing a lock bolt 26 thereon and fixation in the pre-set position of the slide tube 17 on the proximal threaded bearing rod 13 and the distal threaded bearing rod 14. The invention provides osteosynthesis of all types of long bones, one-stage bone reduction and bone fragment reduction preceded by application of a structure in a stabilising mode.

EFFECT: invention provides osteosynthesis of all types of long bones with the use of three-dimensional alignment of the rod apparatus, one-stage bone reduction, elimination of all types of remote bone reduction, use for a short bone fragment of patient's extremity, bone fragment reduction preceded by application of the structure in the stabilising mode.

7 cl, 24 dwg