RU153550U1 - DEVICE FOR MOUNTING THE CLUTCHES OF THE SPINAL IMPLANTS CROSS BAR - Google Patents

Abstract

A device for mounting clamps of the transverse rod of spinal implants, comprising a curved rod with a handle at the distal end, characterized in that a lateral thickening is made at the proximal end of the rod, the proximal end is threaded, and a nut with corrugation of the side surface is installed on it, while the axis of thickening and the threaded rod is a right angle, and the axis of the rod is deviated from the axis of the threaded rod in the direction of lateral thickening by at least 30 °, while all the axes are located in the same plane.

Description

The invention relates to medicine, namely to pediatric orthopedics, and is intended for surgical intervention on the spine, in case of deformation (kyphosis, scoliosis), or traumatic injury (comminuted fractures of vertebral bodies). Currently, both in our country and abroad, the most widely used method of transpedicular fixation of the vertebral segment according to Catrel-Dubosset [1]. This method of fixation of the spine is carried out by correcting spinal deformity by distraction, compression, movement and rotational action with the help of several hooks or screws inserted transpedicularly and two longitudinal rods connected by two transverse rods to give the system a rectangular configuration. In FIG. 1 shows a roentgenogram of the spine after installing the longitudinal rods 1 on the pedicular hooks. The longitudinal rods are interconnected by two transverse rods - 2. Thus, the system becomes closed, which determines its high mechanical and strength characteristics, due to the uniform distribution of loads between the longitudinal rods. After installing on the pedicular screws, or hooks, longitudinal rods as close as possible to the posterior bone structures of the spine, certain difficulties arise when installing transverse rods between them. The transverse rod has a rectangular cross section and is mounted on the longitudinal rod using the clamps of the transverse rod and locking screws. Given that the longitudinal rods are located practically on the bone tissue of the vertebrae, it is difficult to introduce the clamps of the transverse rod using standard instruments that are part of the standard system of stabilization of the spine. Closely located bone and cartilage tissue prevent the installation of clamps, and without additional power techniques, it is not possible to assemble the stabilization system, often it is necessary to use a hammer or other improvised tools, which is not provided for by the holder structures. In addition, for introducing a cross-sectional, rectangular cross-sectional rod into the clamps of the transverse rod, it is necessary to observe their strict orientation in the horizontal plane and at an angle of 90 ° of the transverse rods relative to the longitudinal rods, since even a slight skew allowed during installation after a certain time, will lead to fatigue fracture of the transverse rod. The standard holder for the clamp of the transverse rod of the company “DEOST” [2] is taken by us as a prototype. Holding the clamp of the transverse rod is carried out by introducing the working ends of the holder of the clamp of the transverse rod into the grooves made on the side surfaces of this clamp. The design of the holder is such that the transverse rod, with its help, can only be installed without the application of force, it does not allow any kind of manipulation, especially with the use of force.

The invention consists in a combination of features sufficient to achieve the desired technical result, and consists in improving treatment outcomes by reducing the time of surgical intervention and ease of installation of lateral clamps, with transverse rods, rectangular cross-section, spinal implants in the treatment of deformities, and spinal injuries.

This essence lies in the fact that the device for installing clamps of the transverse rod of spinal implants contains a curved rod with a handle at the distal end. A lateral thickening is made at the proximal end of the rod. The proximal end of the rod is threaded, and a nut with a corrugated lateral surface is mounted on it, while the axis of thickening and the axis of the threaded rod make a right angle, and the axis

rod, deviated from the axis of the threaded rod in the direction of lateral thickening of not less than 30 °, and is located in the same plane with them.

The presence of lateral thickening at the proximal end of the rod increases the strength of the device and allows you to strike at it without fear of changing its configuration.

Threading at the proximal end of the device provides a reliable connection of this device with the clamp of the transverse shaft of the spinal implants.

A fluted nut serves as a lock nut, enhancing the reliability of the threaded connection during handling at the time of installation.

The corrugations along the lateral surface of the nut allow it to be tightened without the use of a tool.

Reinforced with a lock nut, the connection of the device with the clamp of the transverse rod, allows the installation of clamps on the longitudinal rods of the implant with the use of force, ensures the preservation of this connection.

The right angle between the axes of the bulge and the threaded rod provides the necessary direction of application of force when installing the clamp on the longitudinal rods of the implant.

Deviation of the axis of the rod from the axis of the threaded rod in the direction of thickening by at least 30 ° when all the axes are in the same plane allows the surgeon to perform power manipulations of the device without overlapping his hands, and with the handle of the device, the surgical wound, visually control the installation process.

The design of the device is illustrated by the illustrations, where:

In FIG. 1 is a view of a transpedicular structure mounted on a patient's spine;

In FIG. 2 - General view of the device, where 1 is the rod; 2 - lateral thickening on the rod; 3 - threaded end of the rod; 4 - a nut; 5 - device handle.

A device for mounting clamps of the transverse rod of spinal implants consists of a rod 1, a thickening 2 is made at the proximal end of the rod 1, the proximal end 3 of the rod is threaded, and a nut 4 with corrugation of the side surface is mounted on it. At the distal end of the rod 1, a handle 5 is installed.

The device is used as follows.

After mounting the longitudinal rods of the spinal implant on transpedicular screws or hooks, and eliminating the deformation of the spine, the transverse rods of rectangular section are installed, for which the clamp of the transverse rod is released from the standard screw. The nut 4 is screwed on the threaded end 3 of the device for mounting the clamps of the transverse shaft of the spinal implants, closer to the bulge 2, using corrugations on the side surface, freeing the end onto which the clamp of the transverse shaft is mounted by thread so that the proximal end of the device does not extend beyond the inside of the clamp. Fix (counter) the screw connection with the nut 4, screwing it along the threaded end 3 until it is in firm contact with the lateral surface of the clamp of the transverse rod, holding the corrugations on the lateral surface with your hand. The clamp of the transverse rod is mounted on the longitudinal rod using the proposed device. If necessary, force impact - handle 5 is used as a lever, and improvised means are used. A similar manipulation is performed on the contralateral side of the spinal implant, and the clamps of the transverse shaft should be located at the same level so that when installing transverse

rods their location relative to the longitudinal rods was strictly perpendicular. At the end of the installation of the rods, the clamp screws of the transverse rod are installed in the clamps of the transverse rod.

Information sources:

1. Dubousset, J. Recidived une scoliose lombaire et dun basin oblique apres fusion precoce: Le phenomene de villebrequin / J. Dubousset // Preceding Group etudd de la scoliose. Lyon, France: CRFMassues, 1973. - P.62-67

2. The catalog of the company "Deost", Implants for the spine; Spinal stabilization system; neck plates; S. 7, 13.

Claims (1)

A device for mounting clamps of the transverse rod of spinal implants, comprising a curved rod with a handle at the distal end, characterized in that a lateral thickening is made at the proximal end of the rod, the proximal end is threaded, and a nut with corrugation of the side surface is installed on it, while the axis of thickening and the threaded rod is a right angle, and the axis of the rod is deviated from the axis of the threaded rod in the direction of lateral thickening by at least 30 °, while all axes are located in the same plane.

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