SU1489750A1 - Internal fixative - Google Patents

Description

The invention relates to medicine and is intended to ensure the reuse of the fixative for osteosynthesis of tubular bone fractures. Rods 1 are inserted into the bone canal. Then the supports made of a material with a shape memory effect are cooled and the sleeves of the 2 supports are mounted on the rods. When the sleeve 2 is heated, the rods 1 are wedged, and the loops spread the rods to the sides and bend to the rods. After the end of the treatment, the supports are cooled, while the rods 1 approach and wedge -.

are in sleeves 2. 10 Il. with

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The invention relates to medical equipment, namely, trauma instruments for the treatment of fractures of tubular bones.

The aim of the invention is the provision of reuse intraosseous fixator.

FIG. 1 shows the intraosseous fixator, general view; in fig. 2 - the same, side view; in fig. 3 - the same, after deformation in a cooled state; in fig. 4 is the same as in FIG. 3, side view; in fig. 5 scheme of osteosynthesis of oblique fracture of the tubular bone; in fig. 6 - intraosseous fixative, version (general view); in fig. 7 - the same, side view; in fig. 8 - the same, after deformation in a cooled state; in fig. 9 is the same as in FIG. 8, Side view; in fig. 10 is a diagram of the osteosynthesis of oblique fracture of the tubular bone using the device according to the second embodiment.

The intraosseous fixator for osteosynthesis contains rods 1 of identical cross section, for example round (Fig. 1-5) or with longitudinal edges (Fig. 6-10), the ends of which are connected detachably by means of supports, each of which contains sleeves 2, adapted to the shape of the rods 1, connected by means of arcuately curved loops 3, located between the sleeves 2. The sleeves 2 are tubular (Fig. 1-5) or-.c

1489750

legs under the faceted rods 1 (Fig. 6-10) - are arranged with the possibility of changing the distance between them. $

Loops 3 at opposite ends of the device are bent opposite. The sleeves 2 with loops 3 between them are made of a material having a shape memory effect, for example titanium nickelide, and the phase transition temperature of the arcuate loops 3 is higher than the phase transition temperature of the sleeves 2.

The intraosseous fixator works ^ 5 as follows.

Clamp supports are cooled, for example, by spraying with chloroethyl, the diameter of the openings of sleeves 2 (Fig. 3 and 4) is increased, the knives of 20 sleeves 2 are cut apart for faceted rods (Fig. 8 and 9), sleeves 2 come together and loops 3 are located in planes perpendicular to the longitudinal axis of the device (Fig. 3,4,8 and 9). Then 25

rods 1 are inserted into the previously completed channel in juxtaposed bone fragments 4 and 5, at protruding ends of rods 1, they are installed into sleeves 2 and the clamp supports are shifted to the contact time of loops 3 with the surface of bone fragments 4 and 5. memory effect and tends to become a predetermined unit (i.e., original) form, initially, the fixing rod 1 into the sleeve 2, the phase transition temperature is less than the phase transition temperature of the loop 3, θ ₄ by reducing the diameter the hubs of the sleeves 2 (Fig. 2) and the convergence of the legs of the sleeves 2 (Fig. 7), and then when the bends of the loops 3 are restored (Figs. 1,2 and 6,7), the rods are fixed in bone fragments 4 and 5 due to the dilution of the sleeves 2, and when recovering oncoming loops 3 at the opposite ends of the device, constant dynamic compression of the bone fragments 4 and 5 is ensured (Fig. 5 and 10). The ends of the rod 1 protruding from the sleeves 2 are bitten or cut.

After the treatment is completed, the supports at the ends of the device are irrigated with chloroethyl, while the diameter of the holes of the tubular sleeves 2 (figure 4) increases and the legs of the sleeves 2 (figure 9) are separated. The supports of the clamp are removed, and then the rods 1 are removed from the bone.

Claims (3)

Claim An intraosseous fixator containing parallel rods connected at the ends with supports made of a material with a shape memory effect, with the possibility of changing the distance between the rods, characterized in that, in order to ensure multiple use of the clamp, the supports are made removable in the form of sleeves connected by loops with the possibility of fixing the rods in the sleeves and bending loops in the direction of the rods, and the loops have a phase transition temperature greater than the sleeve. 1D8975O 2 1489750 Fy 3 ί I Yes 2/3 Fm9