SU401359A1 - DERMELT WITH A RETURN TRANSITIONAL MOTION - Google Patents

Description

one

This invention relates to medicine, in particular to surgical instruments.

Dermatome with reciprocating) The first movement of the knife, comprising a housing with an oviora bar and guide pins, a collapsible knife mounted on pins, a handle, an axle with an eccentric cam, a connecting rod, a connecting knife with an eccentric, reinforced inside it thickness torus and skin graft width limiter,

A disadvantage of the known dermatome is the considerable vibration of the body, which deteriorates the cutting conditions. In addition, such an arrangement of skin graft limiters complicates the work of the surgeon, i.e., impairs visibility in the working area of the knife.

The known device also does not allow to quickly determine the width and area of the skin graft.

The purpose of the invention is to eliminate the vibration of the body, improve visibility in the working area of the knife and quickly determine the width and thickness of the skin graft.

To do this, on the guide pins, under the knife, a counter-weight is movably mounted, made in the form of a plate with holes and kinematically connected with a two-arm driving eccentric, the axes of which are diametrically opposed, the width limits of the skin graft are

On the onopHoii nlanke, and in the gap, friction strip springs are installed in the gap between the support bar and the wall.

In addition, a scale of divisions is applied to the support bar.

FIG. 1 shows the proposed dermatome, incision; in fig. 2 - the same, top view; in fig. 3 - the same, vnd from below, a section (without a handle); in fig. 4 - the same, front view; in fig. 5 is a section along A-A in FIG. 2

The reciprocating dermat of the knife contains the body 1, the knife 2, the handle 3.

Case 1 is made in the form of an arc connected in the lower part by a base, and in the upper part is a support section of machine 4, on the KOTOpoii limiters 5 are movably located on the skin graft with a friction nolosovoy spring 6 and thickness adjustment knob 1 transverse 1, and also a scale 8 is applied width n scale divisions 9 thickness of the cut transnlantat.

Guide pins 10 are rigidly attached to the sides of the housing 1, on which the knife 2 and the counterweight 11 equal to it in weight, made in the form of a plate with holes, are movably mounted. The knife 2 consists of a bottom base 12 with an anti-slip slide 13, a replaceable blade 14 and an upper plate 15 with a clamping screw 16. At the ends of one of the studs 10, a restrictive roller 18 is hinged to the arms 17 with a hinged screw 19, which interacts with the adjustment knob 7 thickness. A handle 3 is fastened to the middle part of the housing 1 with a threaded joint, inside which is mounted an axle 21 on ball bearings 20, in which a two-shouldered eccentric 22 is installed with a diametrically opposed offset of the axes in the form of a crankshaft. The shoulder 23 of the ball1. Is globally connected through the bearing 24, the connecting rod 25, the bearing 26 and the axial end 27 with the bottom plate 12 of the knife 2, and the shoulder 28 is pivotally connected through the bearing 29, the connecting rod 30, the spring 31 and the axial end 32 of the opposite M 11 The planes of the dermatome (except for the knife) that are in contact with the skin of the donor site have special grooves 33, which restrain the skin from nodvizhnosti when cutting. Dermatom works as follows. The dermatome can be driven by a remotely located electric motor with a flexible sleeve, built into the handle. Cutting of skin grafts is carried out by reciprocating the knife 2, equipped with a replaceable blade 14. The rotational movement of the axis 21 is converted into the reciprocating movement of the knife 2, the operation of the shoulder 23, the eccentric 22 and the shield 25, and the counterweight 11 in the opposite direction of the knife 2 - the operation of the shoulder 28 and the connecting rod 30. The movement of the counterweight 11 dampens the vibration of the dermatome body 1 arising from the movement of the knife 2. The dermatome with eliminated vibration of the body 1 is in good contact with the skin of the donor site, and the knife 2 moves the poppy imalno relatively quickly cut by the skin. The thickness of the skin flap is limited by the roller 18 and is set by turning the knob 7 but the skirt 9. The limiters 5 of the skin flap move along the support bar 4 each separately and are set symmetrically or offset from the axis of the dermatome depending on the location of the donor site on the donor's body. The width of the flap is determined by the slit 8 on the support bar 4 for each limiter. The width of the flap is equal to the sum of the two readings, if the limiters 5 are set with offset, then in this case the dermatom will work with the edge. The same scale 8 can be used to measure the length of the cut flap when determining its area. The subject matter of the invention 1. A dermatom with a return-and-reach movement of a knife, comprising a housing with a support plate and guide pin, a collapsible knife mounted on pins, a handle, the shaft with a drive shaft, an eccentric rod, a rod connecting the cam with an eccentric, thickness regulator and skin graft width limiters, characterized in that, in order to avoid body vibration, on the guide pins, under the knife, a counterweight, movably mounted, made in the form of a plate with holes and kinematically connected with a two-armed drive eccentric whose axes are diametrically opposed offset. 2. Dermatum according to claim 1, characterized in that, in order to improve visibility in the work area, skin graft width limiters are located on the support bar, and friction strip springs are installed in the gap between the support bar and the wall of the limiter. 3. A dermatitis according to claim 1, characterized in that, in order to quickly determine the width and area of the skin graft, a scale of divisions is applied to the support bar.

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