RU1782564C - Appliance for bone stretching - Google Patents

Abstract

Usage: the invention relates to traumatology and orthopedics, in particular to devices for bone extension. SUMMARY OF THE INVENTION: the device comprises an outer 1 and an inner 3 housings located therein with bone fixing MVI elements 2, 4, a spindle screw 9, placed coaxially in the housings, and two chambers of the New mechanisms, one of which is installed in the outer 1 and the other in the inner case 3. At the same time, both ratchet mechanisms are mutually engaged; the screw 9. 9 cp. , -. Joint venture v | 00 s (L about, 4

Description

The invention relates to medicine, in particular to devices for bone extension.

A device for extending a bone is known, comprising an outer and inner case with bone locking elements, a spindle mounted in the bodies, a ratchet mechanism in the form of a driving, driven ratchet wheel and an elastic element mounted in the outer case, and a lever for actuating the device.

The disadvantage of this device is its limited functionality, since it cannot be used during operations on the hand, it injures nearby soft tissues.

An object of the invention is to enable bone extension during operations on fingers and to reduce injury to soft tissues.

In FIG. 1 shows a General view of the device; in FIG. 2 - the device at the time of its installation inside the bone; in FIG. 3 - the device after installing it inside the bone; in FIG. 4 - device in the process of regenerate formation;

The device for bone extension includes an outer casing 1 with a bone fixation element 2, an inner casing 3 with a bone fixation element 4, mounted coaxially with the outer casing 1.

A ratchet mechanism is located inside the outer casing 1: the drive ratchet wheel b is pressed into the cover 5, to which the driven ratchet wheel 8 is mounted on the end of the screw screw 9. The lead screw 9 interacts with an additional ratchet mechanism by means of an elastic element - rings made of silicone rubber. - a khanism placed in the inner case; the thread 10 of the lead screw 9 interacts with the thread 11 of the sleeve 12, rigidly mounted on the inner housing 3. The sleeve 12 is the leading ratchet wheel of the additional ratchet mechanism and has teeth 13 at the end, the direction of which is opposite to the direction of the teeth of the drive ratchet wheel 6. Toward the teeth 13 of sleeve 12, with the help of an elastic element - silicone rubber ring 14, the teeth 15 of sleeve 16, which is a driven ratchet wheel of an additional ratchet mechanism, are pressed. The sleeve 16 contains an axial hole 17 through which the lead screw 9 is passed. The lead screw 9 has two longitudinal flats 18, and the shape of the hole 17 of the sleeve 16 corresponds to the cross section of the lead screw.

The operation of the device is illustrated by lengthening the main phalanx of the index finger.

Online access expose the upper third of the main phalanx of the index finger. Cross the phalanx at the level of the proximal metaphysis. Using known guides in the formed fragments 19 and 20, drill longitudinal and transverse holes 21 and 22, the device is installed inside the distal fragment 19, the fragments are compared, after which the device is moved inside the fragment 20. Then the outer casing 1 is attached using a bone fixing element 2 to the fragment 19, and the inner body 3 is attached with the bone fixing element 4 to the fragment 20.

After healing of the wounds and removal of the sutures, the patient is offered, holding the distal fragment of the main phalanx with the fingers of a healthy hand, rotate the latter by an angle of 5-10 ° relative to the longitudinal axis clockwise. In this rotation, the tooth 15 of the sleeve 16 abuts against the tooth 13 of the sleeve 12 connected to the inner housing 3. Due to the engagement between the sleeve 16 and the spindle 9, the latter is kept from turning relative to the inner housing 3, while the tooth of the ratchet wheel 6 is encircled by the tooth of the ratchet wheel 8. Then the distal fragment 19 is rotated in the opposite direction. In this direction of rotation, the teeth of the ratchet wheel 6 are engaged with the teeth of the ratchet wheel 8. The lead screw 9 rotates relative to the inner case 3 and as a result of the interaction of the thread 11 of the sleeve 12 with the thread 10 of the lead screw 9, the inner case 3 moves translationally relative to the outer case 1. Thanks to the engagement between the lead screw 9 and the sleeve 16, when the lead screw rotates counterclockwise, the teeth 15 in the sleeves 16 run around the teeth 13 of the sleeve 12. The cycle is then repeated. With the gradual extension of the inner case 3 from the outer case 1, the fragments 19 and 20 are moved apart by the required distance, and regenerate 23 is formed between them.

Claims (1)

The claims A device for lengthening a bone, comprising an outer and inner housing located therein with bone locking elements installed at their ends, a screw located in the housings coaxially with them, and a ratchet mechanism mounted in the outer housing and made in the form of a driving and driven storage wheels and an elastic element interacting with the driven wheel, characterized in that, in order to ensure elongation of the bones of the fingers of the hand while reducing trauma to soft tissues, the device is equipped with additional snoring th mechanism housed in the inner housing and configured as a driving ratchet wheel mounted on the spindle, driven ratchet 0 a wheel attached to the inner casing and an elastic element cooperating with the drive wheel, wherein the opening of the drive ratchet wheel and the cross section of the spindle are shaped and congruent, the drive ratchet wheel of the main ratchet mechanism being fixed to the outer case and the bone fixing element connected thereto , and the slave - at the end of the chassis absorbed FIG. 2. twenty FiGZ