Derotation Reducer Linkage With Polyaxial Locking Connector
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Solution Overview
Problem
Current spinal fusion surgery methods face challenges in effectively correcting rotational deformities of the spine due to limitations in the rigidity and maneuverability of existing derotation instruments, which struggle to maintain proper alignment and stability during the procedure.
Innovation Solution
A derotation reducer linkage system comprising left and right reducer linkages with U-shaped openings, rotatable flippers, and a polyaxial locking mechanism that allows for polyaxial movement between extended shaft portions, enabling the formation of a rigid construct that can be rotated as a single body to correct spinal curvature.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If derotation instruments are made rigid to maintain stability during spinal correction, then stability is improved, but maneuverability and ability to accommodate polyaxial movement deteriorate
Solution Approach 1:
The derotation instrument is divided into multiple segments: a first arm and a second arm that can move independently relative to each other. This segmentation allows each arm to maintain stability while the joint between them provides the necessary maneuverability and polyaxial movement capability during spinal correction procedures.
Solution Approach 2:
The instrument incorporates a dynamic joint mechanism between the first and second arms that allows controlled movement along multiple axes. This dynamic capability enables the instrument to adapt its configuration during the procedure, providing both stability when needed and maneuverability when required, resolving the contradiction between these two properties.
2Ease of operation
If derotation instruments are made flexible to improve maneuverability, then ease of operation is improved, but rigidity and stability deteriorate
Solution Approach 1:
By segmenting the instrument into separate arms connected by a joint, each arm can be designed with sufficient rigidity for stable operation, while the joint provides the flexibility needed for maneuverability. This resolves the contradiction by distributing the functional requirements across different components.
Solution Approach 2:
Different parts of the instrument have different mechanical properties: the arms are designed to be rigid for stability, while the joint region is designed to be flexible for maneuverability. This local differentiation of mechanical properties allows the instrument to simultaneously achieve both rigidity where needed and flexibility where needed.
3Stability of the object's composition
If a single rigid construct is used for derotation, then structural stability is improved, but adaptability to different spinal configurations deteriorates
Solution Approach 1:
The instrument features a dynamic joint that allows the second arm to move relative to the first arm along multiple axes. This dynamic capability enables the instrument to adapt to various spinal configurations and patient anatomies while maintaining structural stability during the derotation procedure, resolving the contradiction between stability and adaptability.
Data Source
AI summary
A derotation reducer linkage with polyaxial locking connector for use with screw reducers/extenders in spinal fusion surgery.