Sacral Fixation Plate With Angled Housings for S2 Screw Hold
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Solution Overview
Problem
Existing sacral fixation systems for posterior spinal arthrodesis assemblies face issues with insufficient screw hold over time, leading to weakened mounting and limited lifespan, and there is a need for improved robustness and resistance to tearing forces.
Innovation Solution
A sacral fixation system with a plate design featuring angled housings and screws, allowing for optimal penetration of S1 and S2 vertebrae while incorporating a locking mechanism to prevent screw movement, ensuring mechanical strength and longevity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a sacral plate fixation system with screws is used to achieve robust fixation and resistance to tearing forces, then the mechanical strength is improved, but the screw hold may become insufficient over time, weakening the mounting and limiting its lifespan
Solution Approach 1:
The housing is designed to allow angular adjustment of the screw axis relative to the plate, enabling dynamic adaptation of screw orientation to optimize bone engagement and distribute loads more effectively over time, thereby maintaining screw hold and preventing loosening
Solution Approach 2:
The system allows changing the angular parameter of screw insertion by adjusting the housing angle within a range of 30-60 degrees relative to the plate plane. This parameter change enables optimization of screw trajectory through the bone, improving both initial fixation strength and long-term durability by avoiding stress concentration points
2Ease of manufacture
If the second housing axis forms a fixed angle with the plate plane, then the manufacturing is simplified, but the adaptability to optimize screw penetration and avoid organ damage is reduced
Solution Approach 1:
The housing incorporates an angular adjustment mechanism that allows the screw axis to be oriented at different angles (30-60 degrees) relative to the plate plane. This dynamic adjustment capability enables surgeons to optimize screw trajectory for each patient's anatomy while maintaining a relatively simple plate structure that can be manufactured using standard techniques
Solution Approach 2:
The fixation system is divided into modular components: the plate, the adjustable housing, and the screw. This segmentation allows the housing to be designed with angular adjustment capabilities independent of the plate manufacturing, enabling adaptability without significantly complicating overall system manufacturing
Data Source
Figure 1
Figure 2
Figure 3a~3b
AI summary
Sacral fixation system, comprising a plate (10) including: ∘ a proximal face (16) and a distal face (17), a plate plane extending between the distal and proximal faces, ∘ a first housing (21) extending along a first axis (X21) ∘ a second housing (22) extending along a second axis (X22), ∘ a plate axis, the second axis forming a first angle with the plate plane, and the second axis and the plate axis forming a second angle between 45 degrees and 110 degrees; - a second screw (12), received in the second housing to penetrate at least the S2 vertebra of the patient's sacrum; - a locking plug (13), which includes a skirt (36) and which is received in the second housing by interposing the skirt between the second screw and the second housing.