Device for longitudinal connecting rods

 

The invention relates to medical equipment, namely to devices used for segmental extension rods andcorrective used instrumental correction of deformity and stabilization of the spine. The invention improves the efficiency of surgical treatment, reduction of length of stay in hospital and the risk of complications due to ease of installation, increased rigidity and reliability of fixation. The device has an eccentric connected with the locking bolt in its thick wall, the locking rods end to end. On the edge of the thin side of the eccentric couplings includes a reinforcing collar. The locking bolts protrude into the lumen of the clutch cones and placed in the wells of conical shape, made in the rods. 1 Il.

The invention relates to medical equipment, namely to devices used for segmental extension rods andcorrective used instrumental correction of deformity and stabilize the spine.

A device for segmental increase rod length distractor [USSR Author's certificate No. 1219070 a And 61 In 17/60, 1973], the and abutting the end of one rod and a sleeve with an open groove G - shaped under the above ledge for abutting the other end.

This device is not designed for rigid fixation, therefore, remains a rotational movement between the joined rods within the lower knee of the l-shaped groove, which leads to instability and the emergence of pseudoarthrosis. The castle system is efficient in terms of distraction, but in the course of contractions can occur undocking design in place of fixation, which can lead to pseudoarthrosis and loss of correction. Connection of this device in the wound is complex, requires significant effort and additional manipulation that increases the invasiveness of surgery.

The closest to the essence of the technical solution is a device used in the system Cotrel Dubousset Instrumentation (CDI) “Horizon”, consisting of two rods, the fixed end to the eccentric coupling with four fixing bolts in her colon wall [Dubousset J. C-D Horizon: A New Cotrel - Dubousset Instrumentation. //Spine, 2000, V. 25, No. 6S, P. 86S].

Despite the fact that the device uses four such bolts, under the influence of Omni-directional cyclic loading fatigue failure occurs vertices of the cones fixing bolts while the thin edge of the eccentric coupling resultatives rods. is niania bolts, which leads to instability, pseudoarthrosis and loss of correction.

The present invention is to improve the efficiency of surgical treatment, reduction of length of stay in hospital and the risk of complications due to the ease of installation of the device, increase the toughness and reliability of fixation rods.

When the task has positive therapeutic and socio-economic effect in reducing the length of hospitalization, the rejection of external immobilization, reducing cases of morbidity and duration of stay on disability, which promotes the most rapid and complete social adaptation of patients.

The technical result is achieved due to the fact that you are using the eccentric sleeve, the ends of which at the edge of the semicircle of the thin wall formed by the shoulder, increasing the strength properties of the thinned region and preventing reswallowing rod. Conical holes on the surface of the bars increase rigidity and reliability of fixing bolts due to the fact that the entire cone locking bolt into a hole, therefore, counteracts the destructive forces is not the top of the cone, and the cone from the apex to the by the collar, on rods made holes conical shape corresponding to the location, protruding into the lumen of the clutch cones fixing bolts.

The invention is illustrated graphic material, where the drawing shows a General view of the device in the assembled state. The device consists of an eccentric coupling 2 with a reinforcing collar 7, which is located on the edge of its thin wall 4. In the coupling inserted two rods 1 with two tapered holes 6 in each. Through the screw holes in the thick wall of the clutch 5 four twisted the locking bolt 3, the cone 8 from the apex to the base is immersed in the conical hole of the rods.

The device is used as follows. Known methods provide access to the rear spine. The locking bolts are fully vivencial from the clutch. After installation of the base-locking elements and commit to them the cranial and caudal rods on the free end of one of the rods put on the clutch, so that the end of the rod held out of her holes on 1 see the Free rod capture customerdataset type “crocodile” at 3 cm from its end. A similar tool grab the clutch. By force the ends of the rods compare the end-to-end. When help is O. Movement of the coupling along the axis of the rods terminate when their ends reach the middle of the length of the coupling. By using the electric drill and drill appropriate diameter through the screw holes of the coupling rods form a conical hole. The locking bolt is screwed in the screw holes and tighten with wrench. Installation complete, the wound is sutured in layers, leaving the active drainage.

Claims

Device for longitudinal connecting rods andconnector spine, containing an eccentric connected with the locking bolt in its thick wall of the locking rods end-to-end, characterized in that the edge of the thin side of the eccentric couplings includes a reinforcing collar fixing bolts protrude into the lumen of the clutch cones and placed in the wells of conical shape, made in the rods.



 

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FIELD: medicine; medical engineering.

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