Pressurized locking combined screw system and special composite screwdriver

Abstract

The invention discloses a pressurized locking combined screw system, which is characterized by comprising an assembly (A), an I-shaped assembly (B), an II-shaped assembly (B) and a locking bone fracture plate (C), wherein the assembly (A) consists of two parts: screw threads (1) and screw threads (2), the inside of the screw threads (2) is a hollow prismatic hole, the I-shaped assembly (B) consists of screw threads (4) and screw threads (5), the screw threads (4) are internal screw threads, the screw threads (5) are external screw threads, scales are arranged on the surface of the screw threads (5), the inside of the screw threads (5) is a hollow prismatic hole, the hole penetrates through the screw threads (4), the II-shaped assembly (B) is formed by installing screw threads (9) with the conicity at the tail part of the screw threads (5) of the I-shaped assembly (B), the assembly (A) is connected with the I-shaped or II-shaped assembly (B) through the screw threads (2) and the screw threads (4), the I-shaped or II-shaped assembly (B) is connected with the locking bone fracture plate (C) through the screw threads (5) and the screw threads (12) of the locking bone fracture plate (C), and the screw threads (9) with the conicity of the II-shaped assembly (B) realize the press matching type screw thread connection with the screw threads (12), wherein the thread pitch of the screw threads (2) and (4) is greater than the thread pitch of the screw threads (5), the screw threads (9) and the screw threads (12), and the screw threads (1), the screw threads (2), the screw threads (4), the screw threads (5), the screw threads (9) and the screw threads (12) are coaxial screw threads. The pressurized locking combined screw system has the advantages that a better treatment effect is realized, and the pain of patients during the treatment is reduced.

Description

technical field [0001] The invention relates to a fracture internal fixation device, in particular to an internal fixation device and a system applied to joint fractures. Background technique [0002] The current treatment principles for joint fractures are as follows: intra-articular fractures require non-invasive anatomical reduction of the articular surface, pressurization and firm fixation of intra-articular fracture fragments, bone grafting and bone plate support after bone grafting to reconstruct the metaphysis, early postoperative functional exercise . Reconstruction of the metaphysis of the joint needs to protect the vitality of the soft tissue and the integrity of the capsule. Metaphyseal fractures do not require anatomical reduction, as long as the axis of the limb is maintained, allowing controlled early functional exercise through the relative stability of the overall structure. [0003] At present, the mixed use of locking compression bone plate and multiple ca...

AI Technical Summary

Problems solved by technology

The so-called initial fixation failure refers to: the torque required for the cancellous bone screw to be screwed into the intra-articular fracture depends on the experience of the operator, and is usually overtightened, resulting in plastic deformation of the screw, breakage or a gap between the cancellous bone and the screw thread. The interface damage makes the internal fixation fail

The so-called long-term fixation failure refers to: the cancellous bone screw cannot form a locked whole with the bone plate, and cannot provide angular and axial stability. After a certain period of time, the screws will loosen sequentially under the action of adverse stress, making the internal fixation invalid.

[0009] 2. Although the locking screw can be locked with the locking bone plate, it cannot assist the reduction of the intra-articular fracture block and provide a compression effect. At the same time, the pull-out resistance of a single locking screw in cancellous bone is less than that of a single cancellous bone screw

Therefore, it is often necessary to use locking screws together with cancellous bone screws, locking bone plates or locking compression bone plates, but this still cannot avoid related disadvantages, and the number of screws implanted in the body is greatly increased, but more internal fixation objects are implanted Will lead to greater surgical trauma, higher medical costs and other disadvantages

These shortcomings are particularly prominent in the treatment of partial joint fractures. Currently, the locking plate used in clinical mainstream treatment of partial joint fractures is longer than the fracture area. The bone plate extends to the diaphysis, and the unfractured part of the diaphysis also needs to be screwed in. screws, resulting in greater surgical trauma, and poor attachment of the longer bone plate to the bone may also lead to a decrease in the mechanical effect of the internal fixation system and soft tissue complications

[0011] 4. The torque required to screw the cancellous bone screw into the intra-articular fracture depends on the experience of the operator, so there is a slope of the learning curve, which is not conducive to the formation of quantitative standards for this technique, and the accumulation of experience depends on the experience of failure

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