Patella fracture hollow screw cable locking system

Abstract

The invention provides a patella fracture hollow screw cable locking system, and relates to the technical field of medical instruments. The patella fracture hollow screw cable locking system comprises a hollow screw, a fastening screw and a traction cable, the head end of the hollow screw is provided with internal threads, and the tail end of the hollow screw is provided with external threads. The tail end of the fastening screw is in threaded connection with the hollow screw through an internal thread; and the head end of the fastening screw is fixedly connected with the traction cable. According to the patella fracture hollow screw cable locking system, the hollow screw is adopted, a guide pin can be inserted through an internal through cavity of the hollow screw before a traction wire cable is placed, after reduction, a hollow drill for reaming is not needed, secondary placement of the screw is not needed, reduction fracture displacement is not needed, limited bone loss caused by secondary placement can be avoided, and the patella fracture hollow screw cable locking system is suitable for popularization and application. Meanwhile, incision reduction is not needed, and early rehabilitation after the patella operation is better facilitated. After the guide needle is pulled out, the traction cable and the hollow screw are stably connected through the fastening screw, and the success rate and effectiveness of the operation are further improved.

Description

technical field [0001] The invention relates to the technical field of medical devices, in particular to a hollow nail-cable locking system for patella fractures. Background technique [0002] At present, there are many fixation methods for patella fractures, including suturing around the patella, patella fixation, AO tension band fixation, internal patella fixation, partial or complete patella resection, and Cable-pin system. Among them, with the continuous advancement of orthopedic internal fixation devices, the Cable-pin system has been gradually applied to fracture treatment based on the principle of convergent fixation using convergent tension bands, tension nails and purse string cerclage. [0003] This system uses a half-thread cancellous bone compression screw and a bone tunnel guide pin at both ends of the system. When the screw penetrates into the bone, it will pressurize. The steel cable is easy to tighten because of its flexibility, which effectively prevents the...

AI Technical Summary

Problems solved by technology

Because of the combination of the characteristics of biomechanical materials, the steel cable has a tension band after the cerclage to dynamically pressurize the broken end of the patella fracture, forming an integrated nail and cable, which makes the screw more firm and prevents the steel cable from sliding further. Interaction, the stability is greatly improved, but the Cable-pin system is a solid screw, a hollow drill is required to ream the hole after reset, and the guide pin is pulled out. When the screw is inserted for the second time, the fracture displacement will occur and the screw tunnel cannot be found. , leading to limited bone loss, resulting in failure of fixation

In addition, because the hollow guide wire cannot be used for guidance, simple patella fractures need to be reduced by open reduction, which is not conducive to early recovery

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