Bidirectional Fixation Steel Plate for Intramedullary Nail Stability
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Solution Overview
Problem
Current internal fixation methods, such as the intramedullary nail system, fail to effectively address the issues of unstable fracture ends and non-healing fractures, leading to complications like nonunion and delayed healing, particularly in cases of comminuted fractures.
Innovation Solution
A bidirectional fixation steel plate with guide holes and locking screws is used to stabilize the intramedullary nail, providing rotational and axial stability, and positioning holes for additional screws to ensure accurate placement and contact with the bone shaft, enhancing fracture stability and healing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If intramedullary nail fixation system is used, then the bone fracture can be fixed internally, but the fracture end stability is insufficient leading to nonunion or delayed healing
Solution Approach 1:
The fixation system is divided into two independent but cooperative parts: an intramedullary nail inserted into the bone marrow cavity and a steel plate fixed on the bone surface. Each component provides stabilization from different directions, creating a segmented fixation approach that overcomes the limitations of single-system fixation and significantly improves fracture end stability
Solution Approach 2:
The steel plate structure is designed to wrap around and enclose the intramedullary nail, with the nail nested within the bone cavity and the plate providing external containment. This nested configuration creates a stable fixation system where the internal nail controls rotation and the external plate provides axial stability, resolving the contradiction between internal fixation and stability
2Ease of manufacture
If conventional steel plate with standard holes is used, then the plate can be fixed to bone, but the intramedullary nail lacks rotational and axial stability
Solution Approach 1:
The steel plate is designed with non-uniform hole distribution and varying hole orientations at different locations. The guide holes have specific angles designed to match the nail structure, providing localized rotational control where needed. This local quality variation in hole configuration enables the plate to provide targeted rotational and axial stability to the nail while maintaining ease of manufacture through standardized hole shapes
Data Source
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AI summary
The present invention relates to a bidirectional fixation steel plate and a bone shaft fixation system. The bidirectional fixation steel plate comprises a steel plate body, wherein the steel plate body is used to be implanted from a front side of a bone shaft and has a structure matched with the front side of the bone shaft to fixedly fit with a fracture end, the steel plate body is provided with at least two pairs of guide holes for first locking screws to pass through respectively in the structure matched with the front side of the bone shaft, and angles of the guide holes enable the first locking screws passing through to clamp an intramedullary nail together to control rotation and axial stability of the intramedullary nail. The bidirectional fixation steel plate proposed by the present invention may achieve support, anti-rotation and axial stability of the bone shaft fracture end through the cooperation of the first locking screws and the guide holes of the steel plate body provided with specific angles, to further enhance the reliability of fixation after reduction, thereby effectively guaranteeing to assist in stable reduction and healing of the fracture site.