Triangular Osteosynthesis Plate with Integral Extension for Vertebral Fixation
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Solution Overview
Problem
Existing osteosynthesis plates for the lumbosacral joint either fail to provide complete immobilization of the fifth lumbar vertebra or require complex and delicate immobilization of the bifurcations of the vena cave and the aorta, making the operation challenging.
Innovation Solution
A triangularly shaped plate with an integral upper extension and multiple directional screw holes allows for complete immobilization of the fifth lumbar vertebra while minimizing the mobilization of the bifurcations of the vena cave and the aorta, using a second screw in the extension to secure the vertebra and allowing multidirectional screw placement for secure anchoring.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a triangular plate with one upper hole is used, then the plate can be placed without excessive mobilization of the bifurcations, but complete immobilization of the fifth lumbar vertebra is not achieved
Solution Approach 1:
The plate is segmented into a main triangular body and an integral upper extension, allowing the structure to adapt to the anatomical space while providing multiple screw fixation points. The extension divides the fixation function into two separate upper holes, enabling complete vertebral immobilization without requiring excessive mobilization of surrounding structures.
2Reliability
If a square plate with two upper holes is used, then complete immobilization of the fifth lumbar vertebra is achieved, but substantial and delicate immobilization of the bifurcations is required
Solution Approach 1:
The plate employs an asymmetric design with a triangular main body and a unilateral upper extension rather than a symmetric square shape. This asymmetry allows the plate to fit into the available anatomical space on one side of the vertebral column, providing two upper fixation holes without requiring bilateral mobilization of the bifurcations, thereby reducing surgical complexity.
3Ease of operation
If the extension width is increased, then easier screw implantation is achieved, but mobilization of the bifurcations of the vena cave and aorta is required
Solution Approach 1:
The extension features locally optimized quality with its width specifically dimensioned to accommodate the second upper hole for screw implantation while maintaining a narrow profile throughout its length. This local adaptation allows sufficient space for screw placement without the extension broadening enough to contact or require mobilization of the bifurcations of the vena cave and aorta.
Data Source
AI summary
The plate (1) has a generally triangular shape and includes two juxtaposed lower holes (7), intended to receive implantation screw (2) in the sacrum (100), and a first upper hole (8) for receiving an implantation screw (2) in the fifth lumbar vertebra (101). According to the invention, the plate (1) includes an extension (6) integral therewith, extending its upper side, i.e. protruding from the side opposite the two juxtaposed lower holes (7), the extension (6) having a second upper hole (15) formed in its entirety thereon, for receiving a second screw (2) intended to be implanted in the fifth lumbar vertebra (101), and having, at all points of its length, a width not greater than two times the diameter of the second upper hole (15); the direction in which the extension (6) protrudes from the plate (1) is such that the first upper hole (8) and the second upper hole (15) are placed on a first line (L1) substantially perpendicular to a second line (L2) passing through the two juxtaposed lower holes (7).