SU1655477A1 - Device for executing cranioplasty - Google Patents

Abstract

The invention relates to medicine, namely to neurotraumatology, and can be used in the treatment of cranial defects after trepanation. The purpose of the invention is to eliminate the mobility of the graft and increase the strength of its fixation. The device contains a plate and at least three fixing elements made in the form of splints of porous nickelide, each of which has a flattened head 1 with studs 2 and a trapezoidal rod 4 with divergent end 5. Rods 4 are oriented in the plane of the plate orthogonal to the line of its edge. On the side of the cranial defect, at least three bony grooves 7 of a trapezoidal shape, corresponding in size and shape of the rods 4, are formed, then diverging channels 9 are formed to a depth of the diverging end 5. The fixing element is made of porous material with a memory effect that restores the original a predetermined shape of the divergent end 5 of the rod 4 after preliminary deformation at a temperature below 0 ° C. the porosity creates intimate contact between the plastic and the fixing element; good sprouting of the element by bone tissue is ensured. 5 il.

Description

fe4

The invention relates to medicine, namely to neurotrauma, and can be used in the treatment of cranial defects after trepanation.

The aim of the invention is to eliminate the mobility of the transplant and increase the strength of its fixation.

FIG. 1 shows a fixation element in the form of a pin of porous forming material; Fig. 2 shows the pin in the working position after deformation in the cooled state of the diverging ends, the ends are close together; Fig. 3 shows a diagram of the formation of a trapezoidal bone groove in the skull and channels for the diverging ends of the pin; Fig 4 is a step of inserting the fixation member into the bone grooves; in fig. 5 - skull after cranioplasty, general view, The device contains at least three fixing elements in the form of splints of porous titanium nickelide, each of which consists of a flattened head 1 with studs 2, covered with plastic on the concave surface 3, and a trapezoidal rod 4 with divergent end 5, while gteozhni 4 are oriented in the plane of the plate 6 orthogonal to the line of its edge.

The implementation of the fixing element of porous material with a memory effect, for example, of an alloy of titanium nickelide of the TH-1-P grade, ensures restoration, iep of the initially predetermined shape of the diverging end 5 of the rod, of preliminary deformation at a temperature below 0 ° C. At the same time, the porosity of the material itself provides a good fit to the fixation element with bone tissue. The concave surface 3 of the head 1 of the fixation element is covered with biocompatible plastic, such as pro-acryl, which excludes germination. hane and scar formation between the FIXING element and the membranes of the brain.

A device for spiraoplasty is followed. in a way.

During the operation expose the defect of the skull. From the side of the defect of the skull, using a circular saw and to “form at least three bone grooves 7 of a trapezoidal shape (Fig. 3} so as not to damage the inner surface of the skull plate 8. Sizes and the shape of the bone grooves 7 should correspond to the size and shape trapezoidal retainer rod 4. Then the diverging channels 9 to the depth of the diverging end of the fixation element 5 are formed with a drill in the inner corners of the trapezoidal bone groove. Then 8 the concave surface 3 of the heads presses a thin plate

self hardening plastic. After its polymerization, the diverging end 5 of the fixation element is irrigated with chloroethyl for 20-30 s, cooling it to a temperature below 0 ° C. Using, for example, pliers, the diverging end is squeezed laterally, giving shape (Fig. 2), convenient for insertion into the cylindrical channels 9 of the bone groove 7. Thereafter, the tralezium shaped rod 4 with the divergent end 5 is inserted into the bone groove 7 with cylindrical channels 9 (Fig. 4) so that the trapezoidal rod 4 of the fixation element fits snugly into the trapezoid bone groove 7.

After 30-40 seconds as the contact heating of the porous titanium nickelide to a temperature above 0CC, the shape memory effect appears. In this case, the tail end 5 is moved apart and flatly wedged in

cylindrical channels 9 of the bone groove 7, which ensures reliable fixation of the rod 4, and a tight fit of the fixation element to the bone groove (Fig. 4). Thereafter, a cranial skull defect is carried out. A graft of self-hardening plastic with a size and shape corresponding to the cranial defect is prepared, modeled in the form of plastics; 6 are placed on a concave AHOCib metal plate of the presser and firmly pressed to the defect (Fig. 5). The presence of pores in the head 1 and spikes 2 creates intimate contact between the plastic and the fixing element,

this eliminates the possibility of pushing the plate 6 into the cavity of the skull.

Due to the formation of at least the sin of a trapezoidal bone groove around the perimeter of the bone defect and element

Fixation made of a porous forming material in the form of a pin, having a flattened head with spikes and a trapezoidal rod with a diverging end, provides a significant increase in the fixation of the graft in the bone defect, eliminates the mobility of the graft

50

Claims (1)

Invention Formula A device for cranioplasty containing a plate, characterized in that, in order to exclude the mobility of the graft and increase its strength of fixation 5, it additionally contains at least three fixing elements made in the form of porous nickelmd titanium splints, each splint having a flattened head spiked and trapezoidal rod with divergent the end, the splint heads are placed into the body in the plane of the ortho-plate plate on the side of the ends, and the rods are exactly the lines of its edge. figure 1 Figz 2 H., x- 5