RU2154434C1 - Fixing member for performing femur osteosynthesis - Google Patents

Abstract

FIELD: medical engineering. SUBSTANCE: device has curved plate and branches one of which is long and sharpened at its end and the other one is short. The long branch allows the superior 1/3 part to be intramedullary set and inferior 2/3 part to be extramedullary set. The short branch length is not greater than the intramedullary part of the branch. Opening for screw to be inserted into the superior 1/3 part of the long branch is coaxial with the opening in the short branch. The inferior 2/3 part of the long branch has two additional openings for screw to be inserted. All openings are produced as longitudinal slots providing for retaining dynamic muscular compression effect. EFFECT: enhanced effectiveness of treatment; high stability of osteosynthesis. 1 dwg

Description

 The invention relates to medical equipment, and in particular to devices used in orthopedics for medializing osteosynthesis of fragments of the femur during intertrochanteric or subtrochanteric osteotomies.

 Known devices for compression osteosynthesis of fragments of the femur / see descriptions to the Copyright certificates of the USSR N 180297, 371927, 491382, 820814, M.cl. A 61 B 17/18 / containing a plate / rod / which / which / during osteosynthesis of the femur is fixed to the proximal fragment intramedullary, and to the distal fragment extramedullary. The advantage of the considered devices is the implementation of the medializing effect.

 Common disadvantages of the devices considered are the technological, structural complexity and cumbersome structures, which complicates their installation and leads to unnecessary tissue trauma, in addition, there is the possibility of rotational displacements of bone fragments / A.C. N 180297 /. Clamp by A.S. N 371927 is equipped with spikes to prevent rotational displacements, however, the size and location of these spikes do not allow for stable osteosynthesis.

 Known fixer Pozdnikina Yu. I. / A.S. N 874044 USSR, M.C. A 61 B 17/18 is a prototype / containing the osseous / short jaw / and the intraosseous / long jaw / plates interconnected / or made in the form of a curved plate / and with screw holes. The advantage of this clamp is the simplicity of design. The disadvantage is the lack of medialization of the distal fragment.

 The objective of the invention is to increase the effectiveness of treatment due to: 1) medialization of the distal fragment of the femur, because as a result, the tension of the joint capsule weakens and the lever arm of gravity decreases, which reduces the load on the articular surfaces, 2) increase the stability of osteosynthesis due to: a) maintaining the effect of dynamic muscle compression and b) preventing rotational displacements of the fragments of the femur, which reduces the risk of secondary deformations and development of false joints.

The clamp for osteosynthesis of the femur is made in the form of a curved plate, with a long, pointed at the end, and short jaws. The essence of the invention lies in the fact that the long jaw is configured to install the upper 1/3 - intramedullary, and the lower 2/3 - extramedullary, the length of the short jaw is not more than the intramedullary part of the long jaw, while the screw hole in the upper 1/3 of the long jaw coaxial to the opening of the short jaw, and the lower 2/3 - equipped with two additional holes for the screws, all holes are made in the form of longitudinal slots, providing the ability to maintain the effect of dynamic muscle compression
The drawing shows the installation diagram and design of the proposed device.

 The clamp for osteosynthesis of the femur is made in the form of a curved plate, including a long jaw 1, pointed at the end, and a short jaw 2. The holes 3 of the long and short jaw 1, 2 are made coaxially. Additional holes 4 are made in the lower 2/3 of the long jaw 1. All holes 3 and 4 are made in the form of longitudinal slots.

 Operational plan for the installation of a fixator for osteosynthesis of the femur.

 A corrective osteotomy of the femur is performed in the inter- or subrochanteric region. The proximal and distal femur fragments are matched at pre-calculated angles and width offsets to mediate the distal fragment. The long jaw 1 is inserted into the proximal fragment through the base of the greater trochanter intramedullary, while the short branch 2 bends around the greater trochanter along the lateral surface. Protruding from the proximal fragment 2/3 of the long jaw 1 are screwed through holes 4 extramedullary to the lateral surface of the distal fragment. Moreover, the screw is held at the upper edge of the hole 4. The intramedullary 1/3 of the long jaw 1 and short jaw 2 are attached to the proximal femur with a screw held in the femoral neck through the holes 3. Moreover, the screw is held at the lower edge of the holes 3. Such a screw holes 3 and 4 retain the effect of dynamic muscle compression, and a screw passed through holes 3 into the neck of the femur prevents rotational displacements of the fragments. The wound is sutured in layers.

 The use of this fixative during surgical correction of deformities of the proximal femur is less traumatic, simplifies and accelerates its installation, prevents rotational displacements of fragments of the femur, and also reduces the risk of secondary deformities and the development of false joints.

Claims (1)

 The clamp for osteosynthesis of the femur, made in the form of a curved plate, with a long, pointed at the end, and short jaws, with screw holes, characterized in that the long jaw is made with the possibility of installing the upper 1/3-intramedullary, and the lower 2/3 -extramedullary, the length of the short jaw is not more than the intramedullary part of the long jaw, while the screw hole in the upper 1/3 of the long jaw is coaxial with the hole in the short jaw, and the lower 2/3 are equipped with two additional screw holes, all holes are made in in the form of longitudinal slots, providing the ability to maintain the effect of dynamic muscle compression.