Bone Anchoring Device with Rotatable Seat Member for Adjustable Pivot
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Solution Overview
Problem
Existing bone anchoring devices face difficulties in adjusting the direction of an enlarged pivot angle once the bone anchoring element is partially or fully inserted into a bone, limiting precise orientation during surgery.
Innovation Solution
A bone anchoring device that allows rotation of the seat member holding the head of the bone anchoring element using a driver or tool from the top end of the receiving part, enabling adjustment of the pivot direction with a single support block for pre-orientation and secure locking through pressure exerted from above.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the bone anchoring element is inserted into the bone with a fixed seat member orientation, then the insertion is simple and quick, but the pivot direction cannot be adjusted after insertion
Solution Approach 1:
The seat member is designed to be rotatable relative to the receiving part after insertion, transforming the system from a static fixed-orientation configuration to a dynamic adjustable-orientation configuration. This allows the pivot direction to be changed by rotating the seat member using a driver inserted through the top end of the receiving part, while maintaining the initial simplicity of insertion.
2Adaptability or versatility
If the seat member is made rotatable to adjust pivot direction, then the adaptability is improved, but the device complexity increases
Solution Approach 1:
The receiving part is designed to serve multiple functions: it receives the bone anchoring element, allows rotation of the seat member, provides a passage for the driver to rotate the seat member, and maintains structural support. This multi-functionality reduces the need for additional separate components, thereby limiting the increase in device complexity despite adding rotational adjustability.
3Adaptability or versatility
If the pivot angle is enlarged to provide more orientation options, then the adaptability is improved, but the precision of positioning becomes more difficult
Solution Approach 1:
The driver inserted through the top end of the receiving part serves as a feedback mechanism for positioning. By observing the orientation of the driver during rotation of the seat member, the surgeon can precisely control and verify the pivot direction, ensuring accurate positioning even with an enlarged pivot angle range.
Data Source
AI summary
A bone anchoring device includes a bone anchoring element having a head and a shaft, a receiving part for coupling the bone anchoring element to a stabilization element, the receiving part having a bore having a bore axis, a seat member configured to be arranged in the bore and to be rotatable around the bore axis, the seat member forming a seat for polyaxially holding the head, the seat member being configured to allow a greater pivot angle of the bone anchoring element in a first direction compared to other directions when the bone anchoring element and the seat member are in the receiving part, and a pressure member configured to contact the head to exert pressure onto the head, and to be connected to the seat member, such that the pressure member is rotatable together with the seat member around the bore axis.