SU825052A1 - Device for introducing bone transplant - Google Patents

Description

(54) DEVICE FOR THE INTRODUCTION OF BONE TRANSPLANT

it can be seen that it is necessary to deepen at least one more thread pitch, which will be approximately two thicknesses of the cortical layer. Such a recess is sufficient for areas with poorly developed muscle tissue. For areas surrounded by well-developed muscle tissue, such depth is insufficient and it is necessary to deepen to four thicknesses of the cortical layer, which also leads to elongation of the thread.

The removal of bone chips dictates the creation of gutters that should extend beyond the surface of the incision. Assuming that chip formation is possible, of a length equal to the depth of penetration, the length of the groove should be approximately 0.6 °, where 1 is the length of the thread, and then the length of the grooves will be determined by the above ratio.

The outer diameter of the body is usually 4-8 thicknesses of the cortical layer, 1-2 wall thicknesses of the cortical layer, and the height of the toothed cutting edge 0.4-0.6 thicknesses of the cortical layer.

The depth of the thread and grooves fluctuates within 0.5-1 of the thickness of the cortical bone.

The device works as follows.

All elements of the device are sterilized by conventional methods. The operation is performed under operating conditions in compliance with aseptic rules. Above the site of introduction of the graft (bone schtifta) cut through the skin for 0.6-1.0 cm. On the rod 7 put on the case, facing nut 5 to the handle 8.

With the rod 7, soft tissues are punctured through the skin wound, and the rod is rotated in the desired direction to a predetermined depth (Fig. 2). Then, the body 1 is displaced all the way up to the stop into the bone, the rotational-translational impact on the nut 5 is screwed into the bone with the threaded part (Fig. 3). In this case, the bone chips come out along the grooves 3 of the working surface of the housing, which occupies 1/3 - 1/2 of the circumference of the outer diameter of the housing. Focusing on the division, on the stylate, the value of the created channel is determined, after which the rod is removed. Next, a bone pin is prepared or picked up with a length equal to the length of the bone canal and placed in the body (Fig. 4), after which the pusher is displaced into the bone canal (Fig. 5). By rotating in the opposite direction, the body is removed from the bone (Fig. 6), and then from the wound of soft tissues (Fig. 7). If the edges of the skin wound do not close spontaneously, they are joined with one schwom or strip of adhesive tape.

The design of the device and the possibility of making it with various sizes allows for the use of osteochondropathies in the area of the skeleton of the chest, pelvis, metaphysis,

epiphyses and apophyses of the extremities, as well as in violation of the physical growth of tubular bones.

The presence of a thread on the body of the p-allows to firmly fix it in the bone, maintain the desired shape and size of the channel for insertion of the graft, eliminate the displacement of soft tissues into the canal, facilitate and shorten the duration of the operation. The relative dimensions of the device are established by direct experiment.

5 The device design allows the operation to be performed by one operator without an assistant and shortens the operation time by 3-4 times.

Claims (1)

Invention Formula A bone graft insertion device, comprising a hollow body and a stem with a handle mounted therein, characterized in that, in order to replace spongy and small tubular bones and reduce the trauma of the operation, the outer surface of the working part of the body has a thread and grooves along the housing axis 0 the end of the working part of the body is made in the form of a toothed cutting edge, and the end of the rod has curvilinear cutting edges. Sources of information taken into account in the examination 5 1. USSR author's certificate No. 500798, cl. A 61 B 17/18, 1974.