Combined type pressurizing locking device applied on metrizable torque force for articulation fractures

Abstract

A torsion-measurable combination-type compression locking device for joint fractures, characterized in that: said device comprises a component (A), a component (B), and a locking bone fixation plate (C). Component (A) is composed of a screw thread (1), a screw thread (2), and a tail portion (4). The screw thread (1) is a tapered screw thread, the screw thread (2) is a straight screw thread, and the tail portion (4) is a prismatic structure. The component (B) is composed of a screw thread (5) and a screw thread (7). The inside of the screw thread (7) is a hollow prismatic hole that extends through screw thread (5). The tail portion (4) of component (A) passes through the inside of the screw thread (5) and the screw thread (7). Component (A) and component (B) are connected my means of the screw thread (2) and the screw thread (5). Component (B) and the locking bone fixation plate (C) are connected by means of the screw thread (7) and the screw thread (8). The pitch of the screw threads (2 and 5) is greater than that of the screw threads (7 and 8). The screw threads (2, 5, 7, and 8) are all straight screw threads. The present invention allows for compression of the bone fracture pieces in the joint while also allowing for excellent angular axial stability, measurable torsion, and pressure on the bone fracture fragments.

Description

Technical field [0001] The invention relates to an internal fixation device for fractures, in particular to an internal fixation device and system applied to joint fractures. Background technique [0002] The current treatment principles of joint fractures are as follows: intra-articular fractures require non-invasive anatomical reduction of the articular surface, compression and firm fixation of the intra-articular fractures, bone grafting and bone plate support to reconstruct the metaphysis, and early postoperative functional exercises . Reconstruction of the joint metaphysis needs to protect the vitality of the soft tissue and the integrity of the capsule. The metaphyseal fracture does not require anatomical reduction, as long as the axis of the limb is maintained, and the overall structure is relatively stable to allow controlled early functional exercise. [0003] At present, the design based on this principle and the mainstream use in clinical practice is the mixed use of lo...

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.

[0007] 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

Generally, more internal fixators need to be implanted to realize the treatment principle of joint fractures, but implanting more internal fixators will lead to greater surgical trauma, higher medical expenses 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

[0009] 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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