RU134418U1 - BONE LOCK - Google Patents

Abstract

A bone retainer comprising a screw rod with a threaded end and longitudinal grooves having a bevel at the working end, knitting needles mounted on the screw grooves and a fixing unit mounted on the screw rod, characterized in that the latter is made in the form of a glass provided with side slots and a centrally located hole with recesses, covering the clamping sleeve associated with it by a threaded connection, rotatably mounted on a nut mounted on the threaded end of the screw shaft, the threaded connections being the same th step.

Description

A useful model - bone fixative - refers to medical equipment and can be used in the surgical treatment of patients with injuries and diseases of limb bones.

Known bone retainer containing a rod-screw with a threaded end and longitudinal grooves having a bevel at the working end, spokes located in the grooves of the knitting needles and mounted on the screw-rod, made in the form of a coupling (Bone fixation unit. / Bunov BC, Teplenky M.P. ., Parfenov E.M., Stepanov M.A. // Genius of Orthopedics. - 2012. No. 2, p. 140-143).

However, this design does not provide rigid fixation of the spokes in the grooves of the rod-screw, which does not exclude their migration during osteosynthesis.

The objective of the utility model is the development of a bone retainer, providing increased rigidity of fixation of the bone by preventing the migration of spokes.

This problem is solved in that in the bone retainer containing a screw rod with a threaded end and longitudinal grooves having a bevel at the working end, knitting needles mounted on the screw groove and a fixing unit mounted on the screw rod, the latter is made in the form of a glass equipped with side slots and a centrally located hole with recesses, covering a clamping sleeve associated with it by a threaded connection, rotatably mounted on a nut mounted on the threaded end of a screw rod, and threaded connections have the same pitch.

The utility model is illustrated by the description and diagrams, which depict:

Figure 1 - bone retainer, General view;

Figure 2 - sectional fixation unit;

Figure 3 - node fixation of the bone retainer disassembled.

The bone retainer comprises a screw rod 1 (Fig. 1) with longitudinal grooves 2 having a bevel at the working end and a threaded end 3. In the longitudinal grooves 2 there are spokes 4 that are fixed using the fixing unit 5 mounted on the screw shaft 1. The latter is made in the form of a glass 6, provided with side slots 7 and a central hole 8 with recesses 9 (Fig. 3). The glass 6 covers the pressure sleeve 10, connected with the glass through a threaded connection. The clamping sleeve 10 is provided with a turnkey hexagon head 11, is mounted rotatably on the cylindrical surface 12 of the nut 13 and secured by flaring to eliminate axial displacement, while the nut 13 is mounted on the threaded end 3 of the screw rod 1. Threaded connections of the clamping sleeve with a glass and nuts with a screw-rod are made with the same pitch.

Bone retainer is used as follows.

A rod-screw 1 is inserted into the fixed part of the bone or its fragment by known methods and along its longitudinal grooves 2 having bevels, knitting needles 4. If necessary, loop-shaped stops are formed on the side of the working ends of the knitting needles (not shown on the diagram). In this case, the spokes are displaced in the opposite direction until the abutment contacts the bone. After that, their free ends are fixed in the fixing unit 5. For this, put a glass 8 on the screw rod and place the knitting needles in the recesses 9 of its central hole 8 and, bending the ends at an angle of 90 degrees, insert them into the side slots 7 of the glass 6. Screw on screw-nut 13, with the clamping sleeve 10 mounted on it. Rotating the nut 13 and the clamping sleeve 10 together, screw the latter into the glass 6 until it contacts the spokes 4. In the case of using spokes 4 with stops, rotate the nut 13 in the opposite direction, move glass 6 with a clamping sleeve 10 and zazha bubbled between the spokes towards the pressing stops the bone. The screw-rod 1 is fixed to the support of the transosseous apparatus. The loss of rigidity of fixation of the bone fragment due to bone resorption is eliminated by additional tightening of the nut 13 to maintain a state of stress in the bone fixer - bone system.

To remove the bone retainer, the clamping sleeve 10 is unscrewed from the glass, while at the same time the nut 13 is rotated in the same direction. Having freed from the nut, the glass 6 is displaced along the rod-screw 1. Bite off the needles 4 in straight sections and from the side of the working end is removed from the bone. Then unscrew the screw rod 1.

The use of this bone fixer showed that its use increases the rigidity of fixation of the bone or its fragment by preventing the migration of spokes. At the same time, the device provides the possibility of early dosed functional load in the postoperative period without the threat of loss of fixation due to loosening of the retainer as a result of bone resorption, leading to secondary displacement of fragments and non-fusion, especially in conditions of severe osteoporosis.

Claims (1)

A bone retainer comprising a screw rod with a threaded end and longitudinal grooves having a bevel at the working end, knitting needles mounted on the screw grooves and a fixing unit mounted on the screw rod, characterized in that the latter is made in the form of a glass provided with side slots and a centrally located hole with recesses, covering the clamping sleeve associated with it by a threaded connection, rotatably mounted on a nut mounted on the threaded end of the screw shaft, the threaded connections being the same th step.

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