SU897231A1 - Apparatus for training joints - Google Patents

Description

(54) DEVICE FOR DEVELOPING JOINTS

I

The invention relates to medical technology, namely, devices for carrying out osteosynthesis, and can be used to change the angular position of the bones or their fragments.

An apparatus is known, for developing joints, which contains, with fixed needles, tie rods, crownneins, rigidly connected to the supports and pivotally interconnected 1.

A disadvantage of the known device is that the angular displacements of the bones or their fragments do not allow metered stretching of soft tissues and bone regenerate to an acceptable value, since the displacements are carried out without taking into account the distance from the biomechanical axis of rotation to the zone of maximum stretch of these tissues. Therefore, tissue over-exaggeration is possible, which causes pain in patients and local circulatory disorders. The elimination of the angular displacements of bone fragments with growing fractures or with false joints with a non-dosed stretch of bone regenerate, causes trauma to it.

diminishing osteogenetic potencies and compensatory abilities of the newly formed bone tissue violate the regeneration process.

The purpose of the invention is the elimination of overgrowth of soft tissues and impaired regenerative process.

The goal is achieved by the fact that in the apparatus for the development of joints, containing supports with fixed needles, straps, brackets rigidly connected with the supports and pivotally with each other, the brackets are made L-shaped curved with a longitudinal groove on one of the shoulders, with by this

The 15 shoulders of each pair of brackets are interconnected by screws with the possibility of moving the ends of the screws along the slots of the brackets.

In addition to 3TOfo, the grooves have a linear scale.

20

FIG. 1 shows an apparatus for developing joints, side view; in fig. 2 - slider mounting unit to the bracket; in fig. 3 4 and 5 - brackets installation diagrams. 38 The device contains supports 1, made in the form of rings or arcs, the supports mounted on the bone of the same name are interconnected by strings 2. In the rings (arcs) using fastening elements, for example bolts 3 with a hole under the head, needles are fixed 4. Proximal and the distal supports of opposite bones are interconnected by each other L-shaped curved brackets 5, which, to adjust their position relative to the biomechanical axis of the joint, are mounted on threaded rods 6, connected for stiffness by the bar 7. The angles between the arms onshteynov 90 °. The axis of the hinges 8 brackets 5 coincides with the biomechanical axis of the joint. The brackets are mounted so that some of them are parallel longitudinal axes of the bones, while others are perpendicular. The axes of the grooves of 9 crowns of mattes in the event that the arms of the brackets relative to each other are arranged in parallel planes, intersect the axis of the hinge 8 and, when the shoulders are flattened, are located in the same plane. Along the slots, a linear millimeter scale 10 is applied to the brackets. In the slots of the brackets 5 there are placed sliders 11 with a swivel head 12 (Fig. 2 OB from the biomissan axis to the zone of maximum stretch of soft tissues (Fig. 3). If the brackets are designed (Fig. 4) in such a way that their shoulders are in the same plane and the axes of the grooves run parallel to the surfaces of the brackets with the reduction of shoulders soprikas Each other and are located in planes passing through the center of the axis of the hinge 8, the distances from the axes of the sliders 11 to the axis of the hinge are set using the following dependencies.

OAi ABOUT + a,

OAi ABOUT

where a is the amount of mixing of the axis of the groove relative to the axis of the hinge.

With the dosed elimination of the angular mixing of bone fragments, the distance from the axis of rotation O of the brackets (Fig. 5), which is set at the top of the angular deformation (biomechanical axis), to the zone of maximum stretching of the bone tissue, distance OA and OAj. They are chosen equal to or a multiple of the OB distance.

The axis of the grooves intersect the biomechanical axis:

OAi GAj - n OB Formula.

Claims (1)

1. An apparatus for the development of joints, containing supports with fixed needles, straps, brackets rigidly connected to the supports and hinged among themselves, so that, in order to prevent overgrowth of soft tissues and disruption of the regenerative process, the brackets are made L-shaped curved with a longitudinal groove on one of the shoulders, while The shoulders of each pair of brackets are connected to each other with screws, with the possibility of moving the ends of the screws along the slots of the brackets. The axis of the grooves do not intersect the biomechanical axis: OAi n OB OAg n OB + a tg where n 1,2, 3 ...; and - the angle between the bone fragments. The magnitude of the approach of the arms of the brackets in this case will be more than the permissible magnitude of the regenerate stretch n times. The device works as follows. When the screw 13 is rotated relative to one swivel head 12 and screwed into the other swivel head, the brackets 5 and the associated supports of the apparatus reciprocally rotate, in which the limb bones (bone fragments) are fixed. The approach of the axes of the sliders 11 by means of a screw 13 by a certain amount, for example by 1 mm, ensures the stretching of biological tissues in the zone of their maximum stretch by the same amount. If the thread pitch of the viite 13 is 1 mm, then it is necessary to turn the screw one turn to ensure that the tissues are also stretched 1 mm. With a gradual gradual elimination of the angular displacements of fragments between them, a bone regenerate-wedge-shaped form is formed, the value of which is permissible: at which is the value of the approximation of the sliders of the brackets. In this case, if the distances OAi and OAg are set in multiples of the distance OB, then in order to achieve a height of 1 mm, it is necessary to turn the screw 13 by the number of revolutions equal to the number of multiplicities. The use of the device ensures the optimization of the process of dosed stretching of tissues and significantly simplifies the process of up-. Equal to outer 4pecKacTH. the apparatus for the elimination of contractures of the joints and angular deformations of limb segments. 58972316 1. The device according to claim. 1, distinguishes -1. Transosseous compression and distraction with this grooves have a linear scale, osteosynthesis in traumatology and ortho Sources of information, pedias. Collection of scientific papers. L., 1977,  taken into account during the examination. 102 E I J Cg .f