SU1219062A1 - Fixative for osteosynthesis of femur neck - Google Patents

Description

The invention relates to medical technology, more specifically to traumatology and orthopedics.

The aim of the invention is to provide electromechanical stimulation of the adhesion of the head with the neck.

FIG. 1 shows a fixator for osteosynthesis of the femoral neck, general view; in fig. 2 is a view A of FIG. one.

The clamp contains a hollow cylinder 1, a rod 2 installed in the hollow cylinder 1, a diaphysis pad 3 with screws 4, a locking pin 5 with a flexible rod 6. At the end of the rod 2 there is a threaded groove 7 in which a part of the torsion spring 8 is installed, the end of which fixed in the hole 9 at the end of the rod 2. The other part 10 of the spring 8, located on the middle part of the rod 2, is wound in the opposite direction relative to the part of the spring 8. The end of the part 10 of the spring is rigidly fixed on the hollow cylinder 1. On the head 1 1 of the rod 2 and the head 12 hollow cylinder 1 are located on the same diameter of a series of holes 13. A locking pin 5 is installed in the holes 13 on the heads 11 and 12.

The head 11 of the rod 2 has a slot for a screwdriver, and the head 12 of a hollow cylinder 1 has a turnkey hexagonal shape.

The rod 2 and both parts of the spring 8 and 10 are made of an electrically insulating material or of titanium coated with an emaltal film.

In the free position without installing the locking pin 5, the spring 8 is twisted and protrudes from the grooves 7 1 / 3-1 / 5 of the diameter or thickness of the wire.

The latch works as follows.

In the free state (without installing the locking pin 5), the clamp is screwed 0

into the pre-drilled channel. In this case, the role of the screw threading is performed by the part of the torsion spring 8. A torque is applied to the screwed-in retainer, to the heads 11 and 12, by means of an aperture and a wrench. In this case, part of the spring 8 begins to unwind, exit from the threaded groove 7, and part 10 of the spring is twisted, reducing its length and creating compression between the bone and fragments. In this position, a stopper 5 is installed in the aperture 13 of heads 11 and 12. A flexible bend ha 6 is released from the wound. The energies of the spring 8 and 10 are constantly acting on the bone fragments and bone,

5 creating mechanical radial forces in them, which ensure the emergence of electrical.-Potential, and their difference is the flow of electric current at the fracture site, creating an electrostimulating effect.

After adhesion of bone fragments, it is necessary to stop the mechanical impact on the bone in order to avoid excessive formation of callus at the fracture site. For this, chickpeas are for flexible 6 and

5, the locking pin 5 is removed from the holes 13. The heads 11 and 12 are released and part of the spring 8 is twisted, and part 10 of the spring is unwound. The pressure of a part of the spring 8 against the walls of the channel in the bone fragment is stopped, and the compresses are also stopped. The electric current is weakened and there will be no excessive bone buildup.

The proposed fixture provides a reduction in the timing of adhesions of the femoral neck fractures, and makes it possible to eliminate the repeated operation to extract the fixative.

0

five

FIG. 2

Claims (2)

1. LOCK FOR OSTEOSYNTHESIS OF THE NECK OF THE HIP, containing a hollow cylinder with a spring fixed at its end and connected to the diaphysis pad, characterized in that, in order to provide electromechanical stimulation of the fusion of the head with the neck, a rod of variable cross section with a head and a threaded groove is installed in the hollow cylinder , in which a part of the spring is placed, and on the middle part of the rod its part is installed with the opposite winding, the hollow cylinder and the head of the rod being made with holes for the stopper. 2. The latch on π. 1, characterized in that the rod and spring are made of electrical insulating material. Figure 1>