RU19638U1 - ROD-SCREW TO THE DEVICE FOR TRANSPOSE OSTEOSYNTHESIS - Google Patents

Abstract

1. The screw rod to the apparatus for transosseous osteosynthesis comprises a rod that is equipped with a conical pointed working end and a fastening end, characterized in that the working end has a sharpening made at an angle of 30-35, and a cone-shaped section on which a trapezoidal thread is made, in addition, a smooth cylindrical section, and a thread and a section having faces are made at the fastening end. 2. The screw rod according to claim 1, characterized in that the maximum diameter of the conical section and the diameter of the smooth cylindrical section is 4 mm. 3. The screw rod according to claim 1, characterized in that the maximum diameter of the conical section and the diameter of the smooth cylindrical section is 5 mm.

Description

Rod - screw for transosseous osteosynthesis apparatus

The utility model relates to the Medipino technique, namely to instruments used in orthopedics and traumatology, in particular for fixing bone fragments in transosseous osteosynthesis apparatuses.

Known rod apparatus for lengthening long tubular bones, which contains rods for osteosynthesis, fixed in the holes of the rotary retainers (Pat. 2050839, RF).

Known transosseous external fixation element, which consists of a threaded rod with a cutter; her thread-cutting part. Through the rod, through mutually perpendicular grooves are filled (Application No. 93008881, RF).

A well-known rod for external transosseous osteosynthesis, containing a point pointed at a cone with an angle of 40-45 ° with two flat faces forming one cutting edge, which can be sharpened and connected to the point with a jumper at an angle of 55 °, an intake cone made with teeth for cutting the profile of the persistent thread, and the cylindrical section of the rod following the cone with a persistent thread of the same profile as that of the intake cone (Pat. 2134081, RF).

However, the known rod for external transosseous osteosynthesis contains a suction cone, which, after placing the area with a persistent thread in the bone, protrudes with the pointed cone in soft tissue, in addition, when using the known rod, it is not possible to maintain the rigidity of its fixation in the bone during treatment with possible bone resorption.

The objective of this utility model is to develop the design of the rod - screw to the device for transosseous osteosynthesis, which allows maintaining the rigidity of fixation of the bone - rod system during treatment due to the cone-shaped portion of the trapezoidal thread on the rod.

The problem is solved in that in the rod - the screw to the apparatus for transosseous osteosynthesis, containing the rod, which is equipped with a tapered pointed working end and a fixed end, the working end

it has a sharpening executed at an angle of 25 - 30 ° and a cone-shaped section, on which a persistent trapezoidal thread is made, in addition, a smooth cylindrical section, while the thread and the section having faces are made on the fastening end.

In the embodiment of the utility model, for osteosynthesis of tubular bones of small diameter in children, the diameter of the smooth cylindrical section should be 4 mm, and the fastening end is metric with a metric thread Mb.

For osteosynthesis of tubular bones in adults, it is advisable to use a diameter of a smooth cylindrical section of 5 mm, and the fastening end should also be metric with a metric thread Mb.

Patented utility model is explained by a detailed description, a diagram, which shows a General view of the rod - the screw.

The rod is a screw to the transosseous osteosynthesis apparatus, comprises a rod 1, a working end with a pointed portion 2 and a fixing end 3. At the same time, a conical portion 4 provided with a trapezoidal tapered thread is made on the working end. The mounting end has a metric thread and a shank 5. The latter has a tetrahedral section.

The screw rod is used as follows.

Under anesthesia with a scalpel, a soft tissue puncture is performed with a length corresponding to the diameter of 4-5 mm of the rod 1, then with the help of a drill the rod - screw is screwed to the entire thickness of the bone. In this case, the cutting pointed end 2 drills a hole with a diameter of 2 mm, which includes a conical section 4 with a trapezoidal thread. Using standard parts of the Ilizarov apparatus, the rod - screw is attached to the annular or arc external supports of the apparatus. In addition to fixing the rod using the fixing section 3, you can control the position of the bone fragments. During treatment, if the fixation of the rod decreases as a result of local osteolysis, it is possible, by twisting the rod into the Vi-l revolution, using the section with faces 5, to restore the rigidity of its fixation due to the conical shape of section 4 with a persistent trapezoidal thread.

The proposed rod-screw allows you to reduce trauma to bone tissue, increases the strength of the set rod, provides support for it during the treatment. In addition, the presence of a fastening end with a metric thread makes it easy to fix the screw shaft to the external fixation device and correct the position of the bone fragments. The proposed rod-screw is used in the clinical departments of the Russian Orthodox Church "WTO.

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Claims (3)

1. The screw rod to the apparatus for transosseous osteosynthesis comprises a rod that is equipped with a conical pointed working end and a fastening end, characterized in that the working end has a sharpening made at an angle of 30-35 ^o , and a cone-shaped section on which a trapezoidal thread is made besides, there is a smooth cylindrical section, and a thread and a section having faces are made at the fastening end.  2. The screw rod according to claim 1, characterized in that the maximum diameter of the conical section and the diameter of the smooth cylindrical section is 4 mm. 3. The screw rod according to claim 1, characterized in that the maximum diameter of the conical section and the diameter of the smooth cylindrical section is 5 mm.