Bone Stabilization Locking Device with Posted Member
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Solution Overview
Problem
Current bone stabilization systems for spinal correction and support lack effective mechanisms for securely attaching and stabilizing spinal rods to bone anchors, leading to potential instability and stress concentration at the interface.
Innovation Solution
A locking device comprising a seating member and a posted member, where the posted member includes an interface member with a post that extends into an opening of the seating member, facilitating secure attachment and control of the stabilization member within the coupling mechanism, and a surgical drive tool for inserting and extracting the locking device.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a traditional locking mechanism is used to secure the stabilization member to the bone anchor, then the attachment is secured, but stress concentration occurs at the interface leading to potential instability
Solution Approach 1:
The locking device is divided into multiple functional components: a seating member with opening, a posted member with post, and an interface member. This segmentation distributes the load and stress across multiple contact points rather than concentrating it at a single interface, thereby maintaining attachment security while reducing stress concentration.
Solution Approach 2:
The posted member acts as an intermediary element between the seating member and the stabilization member. The post of the posted member extends into the opening of the seating member, creating a distributed load path that reduces stress concentration at the interface while maintaining secure attachment.
2Stability of the object's composition
If the stabilization member is securely fixed within the coupling mechanism, then stability is improved, but the complexity of the locking device increases
Solution Approach 1:
The seating member, posted member, and interface member are combined into a single integrated locking device assembly that is inserted as one unit into the coupling mechanism. This merging approach maintains system stability through proper distribution of functions while simplifying the installation process and reducing the number of separate components the surgeon must handle.
Solution Approach 2:
The locking device is designed to perform multiple functions within a single assembly: the seating member provides structural support and load distribution, the posted member provides positioning and control, and the interface member secures the stabilization member. This multi-functionality achieves system stability without requiring multiple separate components.
3Ease of operation
If the posted member is disposed between the seating member and the stabilization member, then control of the stabilization member is facilitated, but the device complexity increases
Solution Approach 1:
The posted member is pre-positioned within the locking device assembly during manufacturing, with the post already extending into the opening of the seating member. This preliminary action allows the stabilization member to be controlled and positioned correctly during insertion without requiring complex adjustment mechanisms or additional steps during surgery.
Data Source
AI summary
A locking device and method are provided for a bone stabilization system which includes a bone anchor, a coupling mechanism and a stabilization member, wherein the coupling mechanism couples the stabilization member to the bone anchor. The locking device includes a seating member and a posted member. The seating member is operatively associated with the coupling mechanism for securing the stabilization member within the coupling mechanism, and is configured with an opening therein. The posted member, which includes an interface member and a post extending therefrom, is configured for disposition between the seating member and the stabilization member with the post extending therefrom being received into the opening in the seating member when the seating member is employed to secure the stabilization member within the coupling mechanism. The post is sized to engage and facilitate control of the stabilization member as the seating member operatively engages the coupling mechanism.