RU2035899C1 - Device for directing screw - Google Patents

Abstract

FIELD: medical engineering, particularly, traumatology and orthopedics. SUBSTANCE: this device incorporates stilet 1, external bushing 5, internal bushing 2, and pins 10 and 11. External bushing 5 has two guides made in the form of tubes 8 and 9. Bushings 2 and 5 has openings in their end portions, which are coaxially disposed relative to tubes 8 and 9. EFFECT: more reliable design. 8 dwg

Description

 The invention relates to medicine, namely to traumatology and orthopedics, and can be used to introduce screws of the Shants type into the bone in the treatment of fractures with rod fixation devices.

 A device is known as a “triple trocar” [1] consisting of a trocar itself, two bushings and designed to insert a Shants screw into a hole pre-drilled in the bone. The soft tissue is perforated with a triple trocar in assembled form through a previously made skin incision until it stops in the bone surface. The trocar stylet is removed and a hole of the required size is drilled through the bushings into the bones. Then, the Shants screw is screwed into the hole through the outer sleeve.

 The disadvantage of the closest analogue device is the lack of a device in it that allows you to accurately fix its position on the curved surface of the bone. The vibration of the electric drill displaces the bushings held by the assistant’s hand, which can lead to slipping of the drill and complications: trauma to soft tissues and adjacent neurovascular structures, inaccurate drilling of holes.

 Using the proposed device, you can achieve accurate drilling holes in the bone, completely eliminate the possibility of the above complications.

 In FIG. 1 shows a disassembled device; in FIG. 2 the same, in assembled form; in FIG. 3-8 stages of using the device.

 The device consists of a stylet 1, an inner sleeve 2 with holes 3 and 4 in its end parts, an outer sleeve 5 with holes 6 and 7 in its end parts, guides 8 and 9, rigidly connected to the outer sleeve.

 The device is used as follows.

 Through the perforated scalpel skin above the site of the proposed screw insertion, an electric drill is used to carry the Kirchner needle 10 in the direction of the diameter of the bone until it stops in the opposite cortical layer (Fig. 3). The device is put on the spoke 10 through the hole of one of the guides, for example 8, and through it through the holes in the end parts of the sleeves 2 and 5, it is advanced through the perforation hole in the skin and soft tissues until it stops in the bone (Fig. 4).

 Through the hole 2 of the inner sleeve and the hole 5 of the outer sleeve along the guide 9, the Kirschner needle 11 is held all the way to the bone and then with the electric drill all the way to the opposite cortical bone layer (Fig. 5).

 The stylet 1 of the device is removed. For convenience, the ends of the spokes 10 and 11 are bred to the sides and a drill 12 of the desired diameter is drilled through the bushings 2 and 5 through the hole (Fig. 6). The drill is removed, the inner sleeve and the screw 13 is inserted through the outer sleeve 5 using the chuck 14 (Fig. 7). Remove the knitting needles, outer sleeve. The screw 13 is left in the bone (Fig. 8).

 The advantages of the proposed device are the ability to drill holes in a precisely defined location of the bone with the prevention of complications of trauma to soft tissues and damage to neurovascular formations.

Claims (1)

 A DEVICE FOR DIRECTING THE SCREW OF THE SCREW, consisting of a stylet, an external and an internal sleeve, characterized in that the external sleeve is provided with two guides in the form of tubes, the sleeve has holes in the end parts, while the tubes and holes are aligned coaxially.

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