RU63670U1 - DEVICE FOR INSTALLATION OF LAVSAN VASCULAR PROSTHESIS FIXTOR - Google Patents

Abstract

The device can be used for surgical reconstruction of the anterior cruciate ligament of the knee joint. The device is a T-shaped structure containing a handle of circular cross-section (1) and a rod (2), rigidly connected to each other. 1/3 of the rod (3) at the distal end is a working part with a diameter of 3-4 mm. At the distal end of the working part, a thread (4) is made, onto which 2 nuts (5, 6) are screwed to support the clamp. The developed design allows to increase the reliability of the fixation of the lavsan vascular prosthesis fixator during surgical reconstruction of the anterior cruciate ligament of the knee joint. 1 ill.

Description

The utility model relates to the field of medicine, namely traumatology and orthopedics, and can be used to install the lavsan vascular prosthesis fixator during surgical reconstruction of the anterior cruciate ligament of the knee joint.

During surgical reconstruction of the anterior cruciate ligament of the knee joint, lavsan is widely used as a material for prosthetics (Movshovich I.A. Operative orthopedics. Manual for doctors. Ed. Second, revised and supplemented. M., "Medicine", 1994, 445 pp., S.299). A lavsan vascular prosthesis in the form of an lavsan ribbon is passed through the formed through channels, one in the external condyle of the thigh, the other in the metaphysis of the tibia. The tape is fixed on the external condyle of the thigh using a knot, and on the tibia it is sutured to the surrounding tissues. Fixation of the lavsan ribbon by tying the knot is not reliable enough, since in some cases it can be untied or, over time, the knot can decrease due to its constant tension, which can lead to its penetration into the formed channel, which may lead to instability of the restored knee ligament.

The authors of the claimed utility model have developed a method for the surgical treatment of chronic injuries of the anterior cruciate ligament of the knee joint, which improves the reliability of fixation of the prosthesis. (Application for invention No. 2005134029/17 (038060) dated 11/03/05. The decision to grant a patent for the invention on 11/21/06). In this method, spherical fixers made of bone cement are used to secure the ends of the vascular lavsan prosthesis.

Fastening the ends of the prosthesis with the help of clamps increases the reliability of fixing the end of the prosthesis due to the effect of mechanical jamming.

Initially, the authors used the Billroth clamp to install the latch, consisting of two articulated jaws with rings, a lock like a cremallera and a working part. (Ostroverkhov G.E., Bomash Yu.M., Lubotsky D.N. Surgical surgery and topographic anatomy. Textbook for students of medical universities, 4th edition, supplemented, Kursk. Rental enterprise "Kursk", 1999, 719 pp. , P.31; Burykh MP, General principles of the technology of surgical operations. Rostov-on-Don, Publishing House "Phoenix", 1999, 544 p., S.59). Using the working part of the clamp, the latch is captured and brought to the inlet of the bone channel, holding the latch. At the same time, with the help of the ram, they hit the retainer, thereby ensuring the introduction of the retainer into the bone canal. Billroth clip is selected by us as a prototype.

The installation of the clamp using the Billroth clamp has the following disadvantages:

1. The reliability of the installation of the latch due to the possibility of slipping the latch from the clamp during installation of the latch.

2. Difficulty in installing the latch in accordance with the axis of the channel.

3. The need for assistance of an assistant at the stage of using the pad.

The technical result of the utility model is to ensure the reliability of the fixation of the lavsan vascular prosthesis during surgical reconstruction of the anterior cruciate ligament of the knee joint, as well as simplifying the installation of the fixator.

The problem is solved in that the device is a T-shaped structure consisting of a handle of circular cross section and a rod rigidly connected to each other. 1/3 rod per

the distal end is a working part with a diameter of 3-4 mm, a thread is made at the distal end of the working part, on which 2 nuts are screwed to support the clamp.

Distinctive essential features of the claimed utility model are:

1. The form of the device, that is, in the form of a T-shaped structure.

The T-shaped design provides convenience for the surgeon when screwing the latch on the device shaft, as well as when installing the latch.

2. The connection of the handle and the rod is rigid.

A rigid connection of the handle and the rod is necessary to ensure the operation of the device with the application of shock loads on the handle when installing the latch.

3. The implementation of the handle with a circular cross section.

The presence of a circular cross-section at the handle provides ergonomic tools, that is, ease of use for the surgeon.

4. 1/3 of the rod is the working part.

The average depth of the joint with soft tissues is 6-7 cm, so the length of the working part of the shaft should be at least 7 cm, the distance from the handle to the working part of the shaft of 14-16 cm is sufficient for convenience when working with the device, so the working part should be 1/3 of the rod.

5. The implementation of the working part of the rod with a diameter of 3-4 mm

Performing a diameter of the working part of less than 3 mm can lead to a decrease in the strength characteristics of the device and, as a result, to breakdown of the device, and more than 4 mm will reduce the convenience of manipulation in the joint, since 4 mm is the maximum allowable size for arthroscopic manipulations in the knee joint.

6. The presence of threads at the distal end of the working part of the shaft is necessary for screwing on the nuts and retainer.

7. The presence of 2 nuts at the distal end of the working part of the rod-support and locknuts - necessary to support the latch

The set of distinctive essential features is new and allows to increase the reliability of the fixation of the lavsan vascular prosthesis during surgical reconstruction of the anterior cruciate ligament of the knee joint, as well as to simplify the installation of the latch.

The essence of the utility model is illustrated by the drawing, where Fig. 1 schematically shows a device for installing a fixer of the lavsan vascular prosthesis, where:

1. - handle

2 - rod

3. - 1/3 of the rod - the working part with D 3-4 mm.

4. - thread at the distal end of the working part

5. - bearing nut

6. - locknut

The length of the device is 215 mm, the thread pitch is 1 mm. The dimensions of the device handle are 120 × 5 mm. The length of the shaft is 210 mm. The length of the working part is 70 mm. The diameter of the rod in the area from the handle to the working part of the rod is 7 mm. The diameter of the working part is 3.5 mm. Sizes of nuts - inner diameter - 3.5 mm, outer diameter - 7 mm, thickness - 4 mm. Conical polyacrylamide retainer with dimensions - Length - 20 mm, diameter at the base - 6 mm, with internal thread 3.5 × 10 mm. The handle is connected to the rod by rolling. Another rigid connection is possible, for example, by welding. The device is made of titanium alloy VT-6 (Ti-Al-4V).

Sterilization of the device is carried out immediately before a surgical operation together with surgical instruments. A clamp having an internal thread corresponding to the thread of the working part of the rod is screwed onto the working end of the device.

After passing through the channels of the lavsan vascular prosthesis, a device for installing the fixator of the lavsan vascular prosthesis is inserted into the knee joint through the anteroposterior access towards the intercondylar notch. The latch at the end of the device is set with the tip to the inlet of the femoral canal. The correct location of the latch is checked. The fixer is inserted into the channel by striking hammers on the handle of the device. When the latch extends 1 mm beyond the edge of the canal in the lateral condyle of the thigh, it is necessary to test for stability by slightly pulling the device towards you. After making sure that the retainer is jammed, unscrew the working part of the rod counterclockwise and remove the working part from the joint. Arthroscopic examination of the fixator is performed.

The inventive design of the device for installing the lavsan vascular prosthesis fixator allows to increase the reliability of the installation of the lavsan vascular prosthesis fixator during surgical reconstruction of the anterior cruciate ligament of the knee joint, as well as to simplify the installation of the fixator.

Claims (1)

A device for installing a lavsan vascular prosthesis retainer, which is a T-shaped structure consisting of a circular handle and a shaft rigidly connected to each other, 1/3 of the rod at the distal end is a working part with a diameter of 3-4 mm, at the distal end of the working parts made thread on which two nuts are screwed to support the latch.