Anterior Spinal Deformity Correction With Rotatable Screw Platforms
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Solution Overview
Problem
Existing anterior spinal deformity correction devices face limitations in angular stability and space constraints, particularly due to unpredictable angular changes between vertebral body screws and screw-head platforms, which can complicate surgery and increase the risk of component loss.
Innovation Solution
A device with a screw-head platform that rotatably connects the main vertebral body screw, restricting axial movement while allowing rotational freedom, and aligns the anchor screw in a common plane with the main screw to enhance angular stability and reduce the platform's size, minimizing space requirements and improving biomechanical stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the main vertebral body screw is freely connected to the screw-head platform, then the screw can be easily inserted and positioned, but unpredictable angular changes occur between the screw and platform during or after implantation
Solution Approach 1:
The connection between the main vertebral body screw and screw-head platform is designed to be dynamic during insertion (allowing free movement for ease of positioning) but becomes stable once implanted. The rotatable connection allows the screw to be inserted at various angles relative to the platform, but once secured, the angular relationship is fixed, providing reliability during and after implantation.
2Reliability
If the screw-head platform is made larger to accommodate separate anchor screw positioning, then better angular control is achieved, but the space requirements within the vertebral body increase
Solution Approach 1:
The screw-head platform is designed as a multi-functional component that serves multiple purposes: it provides the main screw attachment point, guides anchor screw positioning, and maintains angular relationships between all screws. By integrating these functions into a single compact platform, the invention achieves reliable angular control without requiring excessive space within the vertebral body.
Solution Approach 2:
The anchor screw positioning mechanism is nested within or integrated into the screw-head platform structure. The platform contains features such as guide bores or positioning elements that are part of its overall structure, allowing the anchor screw to be positioned at the correct angle relative to the main screw without requiring a separate, larger platform structure.
3Adaptability or versatility
If multiple separate components are used for screw and platform assembly, then flexibility in positioning is improved, but the complexity of assembly during surgery increases and risk of component loss rises
Solution Approach 1:
The invention merges the screw-head platform with the main vertebral body screw into a closely integrated assembly. The platform is designed to be attached to or form part of the screw structure, reducing the number of separate components that need to be handled and assembled during surgery. This integration maintains positioning flexibility while significantly reducing assembly complexity and the risk of losing small components.
Data Source
AI summary
A device, kit and method for the correction of spinal deformity using an anterior approach. The device comprises a screw-head platform, wherein the screw-head platform comprises a primary recess for receiving a primary rod, and a main vertebral body screw rotatably connected to the screw-head platform.