Pressurized combination screw capable of quantizing torsion and composite screwdriver thereof

Abstract

The invention discloses a pressurized combination screw capable of quantizing torsion. The pressurized combination screw is characterized by comprising a component (A) and a component (B), wherein, the component (A) consists of a thread (1) and a thread (2), and a hollow prismatic structure (3) is contained in the tail part of the thread (2); the component (B) is an internally hollow columnar object, a thread (5) is arranged on the upper end inside the component (B), a flat tail end (7) is arranged at the tail part of the component (B), and a prismatic hole (6) is contained in the component (B); and the thread (2) is matched with the thread (5), the bore diameter of the prismatic hole (6) is greater than that of the hollow prismatic structure (3) contained in the tail part of the thread (2), the thread (1), the thread (2) and the thread (5) are coaxial, and the pitch and depth of the thread (1) are greater than those of the thread (2). The invention further discloses a special composite screwdriver of the pressurized combination screw. By adopting the pressurized combination screw, better treatment effect can be obtained, and patient pain in treatment can be reduced.

Description

technical field [0001] The invention relates to a medical fracture fixation device, in particular to an internal fixation system applied to reduction, pressurization and strong fixation between fracture blocks. Background technique [0002] In the treatment of some fractures that require surgery, such as: joint fractures, femoral neck fractures, etc., it is necessary to use lag screws to achieve reduction, compression and strong fixation between the fracture fragments. The biomechanical principle of this treatment method and the internal fixation used is as follows: the lag screw relies on the axial compressive stress between the spacer or the bone plate and the cortical bone to form a compression effect between the fracture fragments to realize the reduction and restoration of the fracture fragments. Pressurize and hold firmly. However, at present, when the lag screw achieves reduction, pressurization and strong fixation between the fracture fragments, it cannot quantify t...

AI Technical Summary

Problems solved by technology

However, at present, when the lag screw achieves reduction, pressurization and strong fixation between the fracture fragments, the torque required to screw in the lag screw cannot be quantified, and the pressure between the fracture fragments cannot be quantified, and there is a problem of initial fixation failure.

[0003] The so-called initial fixation failure refers to: the torque required for the lag screw screwed into the fracture fragment depends on the experience of the surgeon, and it is usually overtightened, resulting in plastic deformation and fracture of the screw, or damage to the interface between the bone and the thread, making the internal fixation invalid

The torque required to screw the lag screw into the fracture depends on the experience of the operator, and the accumulation of experience depends on the experience of failure. There is a slope of the learning curve, which is not conducive to the formation of quantitative standards for this technique.

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