Connecting assembly of spine orientation double-end screw

Abstract

The connecting assembly comprises a screw, a screw seat and a mold sleeve, the screw seat is sunken downwards to form a first U-shaped rod groove and a second U-shaped rod groove which are adjacent to each other, a guide hole is formed in the bottom of the first rod groove, a first rod groove locking thread is arranged on the inner wall of the first rod groove, and a second rod groove locking thread is arranged on the inner wall of the second rod groove. The bottom of the first rod groove locking thread is sunken downwards to form an annular limiting groove, and a second rod groove locking thread is arranged on the inner wall of the second rod groove. The screw comprises a screw rod and a screw head at the front end of the screw rod; the mold sleeve is cylindrical, and the mold sleeve is sleeved on the head of the screw. According to the connecting assembly of the double-end screw, through the split type design, the performance of fixing the double-end screw is guaranteed, meanwhile, the machining difficulty is lowered, and the cost is saved.

Description

technical field [0001] The present application relates to the technical field of medical devices, and in particular, to a connection assembly of a spinal orientation double-head screw. Background technique [0002] Spinal screw rod internal fixation system is widely used in the surgical treatment of spinal correction. After spinal correction surgery, the single screw and connecting rod may break the connecting rod to a certain extent due to excessive postoperative movement or excessive weight of the patient. risk. In order to prevent the fracture of the connecting rod in the spinal internal fixation system, it is generally parallel in the osteotomy area, and another connecting rod increases the overall strength of the spinal screw rod internal fixation system. Therefore, a double-headed screw used to connect the parallel double rods. being widely used. [0003] In the prior art, the structure of the double-headed screw used for the fixed direction of the double-bar connect...

AI Technical Summary

Problems solved by technology

[0003] In the prior art, the structure of the double-headed screw used to fix the direction of the double-rod connection is an integrated structure of the screw and the nail seat. During processing, this integrated fixed double-ended screw structure causes great difficulty in production and processing. The production cycle is long, and the shape of the screw part and the nail head part is poor, which also leads to material waste, poor processing technology, and low processing efficiency.

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