SU1311729A1 - Fixative of the femur neck - Google Patents

Abstract

This invention relates to traumatology and orthopedics, intended for fixing the neck of the femur and helps prevent the spongy substance of the bone from being removed when the fixator is removed. The retainer includes a threaded body 1 with derotational ribs 2, adjusting nuts 5, spring-loaded petals in the shape of needles 11, the curved ends of which are directed to one side. The needles are placed in several circular anavas and are displaced in a checkerboard pattern. A rod with needles recessed into the grooves is inserted into the bone canal and screwed into the reference mark. The needles 11 are spread and penetrate into the spongy substance, which ensures reliable fixation of the fragment and constant compression between the fragments. When removing the retainer, the rod is unscrewed, the needles 11 are pressed into the grooves by the direction of the bend, which prevents the sponge from being removed. 6 Il. (L 8 6

Description

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The invention relates to medical technology, namely to traumatology and orthopedics.

The aim of the invention is to prevent the spongy substance of the bone from being removed when removing the fixative.

FIG. Figure 1 shows the femoral neck fixative installed in the thigh, a general view; in fig. 2 - retainer with retracted petals, cross section; in fig. 3 - the same, with extended petals, in FIG. 4 - threaded rod; in fig. 5 shows a hollow threaded body; FIG. 6 shows section A-A in FIG. 5. I

The clamp contains a hollow cylindrical threaded body 1 with detonated ribs 2. On the threaded body 1 on the side of its threaded part there are interconnected washers 3 with spring 4 and adjusting nuts 5 and 6. A threaded rod is rotatably mounted in the threaded body 1 7 with locking nut 8 and slot 9 at one end. At the other end of the threaded rod, which is an inlet, are annular grooves 10, in which the ends of the spring-like petals, having the form of curved needles 1.1, are fixed at one end. The hollow cylindrical threaded body 1, on the side of the outlet, has windows 12 located in several lines around the perimeter in a checkerboard pattern. All the pointed ends of the bent needles 11 are directed to one side, and the bent needles 11 are fixed in the annular grooves 10 not along one vertical, but in a checkerboard pattern. The needles 11, for example, the first and third grooves 10 are offset with respect to the needles 11 of the second and fourth grooves 10 by 60. Windows 12 on the threaded body are located opposite the needles 11. In the initial position, all curved needles 11 are recessed in the grooves 10, and their sharp ends abutted with the side side between the window joints 13. At the ends of the threaded body 1 and the threaded rod 7 marks must be stamped (not shown ), indicating the relative position of the windows 12 and the bent needles 11. Work with the latch occurs as follows.

After accessing the femur, a channel is drilled, the diameter of which is 1-1.5 mm smaller by

92

The diameter of the threaded body 1 is then screwed into it by a threaded rod 7 with curved needles 11 recessed into its grooves 10.

After that, the threaded rod 7 is rotated until its marks coincide with the marks on the threaded body 1. As a result, the bent needles 11 pass through the windows 12, extend beyond the threaded body 1 and penetrate into the spongy material of the femur. The final position of the bent needles 11 is fixed by the fixing nut 8. The position

the bent needles 11 around the threaded body 1, their offset position relative to each other and a large number ensure reliable fixation of the proximal part of the fixer within the limits of the proximal fragment and allow the approximation of the physical fragment close to the proximal part while simultaneously creating constant compression between the fragment

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Additional factors ensuring reliable fixation of the bent needles 11 within the spongy substance are the contours of the windows 12 of the threaded body tightly inserted into the bone tissue, which even with pronounced osteoporosis eliminates the risk of the bent needles 11 cutting into the spongy substance.

After installing the retainer, a figured washer 3, spring 4 and adjusting nuts 5 and 6 are put on the threaded body 1, Spring 4 creates a constant compression between the fragments,, Rotation of the nut 5 can regulate the compression force, the Rotational ribs 2 prevent rotational movements of the retainer. Remove latch

after splicing, the fragments are performed in the same order as

Claims (1)

Invention Formula A femoral neck fixator containing a hollow threaded body with derotational ribs, on which from the side of its threaded part are placed interconnected washers with a spring and adjusting nuts; a threaded rod is mounted in the housing for rotation; spring sliding petals are different, in that 3 131 warnings to see the spongy bone substance when removing the fixer, the hollow threaded body on the side of the outlet opening has windows located along the perimeter in a checkerboard pattern, the input end of the threaded 29 The rod is made with annular grooves in which spring ends are fixed with one end, having the form of curved needles, and the free ends of the ends are in contact with the inter-window spaces of the housing. // 13 2 eleven 12 f1 W FI.5 - /) Compiled by L. Povarov Editor I. Shulla Tehred A. Kravchuk Proofreader L. Patay Order 1913/5 Circulation 596 Subscription  USSR State Committee for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5 Production and printing company, Uzhgorod, st. Project 4 FIG. five Phage.5