Polyaxial Bone Anchor Extension Device with Actuated Pivot Control
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Solution Overview
Problem
Current devices for correcting bone fractures using bone anchors and extension devices lack controlled manipulation and convenient attachment, which can complicate surgical procedures and limit accessibility for surgeons.
Innovation Solution
A device comprising a system with two receptacles for accommodating extension devices, allowing for controlled pivoting and movement of bone screws via actuation devices that change the distance between pivot axes, enabling easy attachment and manipulation of bone anchors for precise fracture correction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If polyaxial bone anchors are used to provide flexibility in orientation, then adaptability is improved, but device complexity increases due to the need for additional blocking mechanisms
Solution Approach 1:
The bone anchor system transitions from a static fixed-orientation design to a dynamic polyaxial design that allows movement during insertion and then can be locked into position. The extension device incorporates a blocking mechanism that can dynamically transition between allowing pivoting motion and constraining the anchor in a fixed orientation, providing both flexibility and stability as needed during different surgical phases.
2Ease of operation
If extension devices are made longer to provide better leverage for manipulation, then ease of operation is improved, but device complexity increases due to additional attachment mechanisms
Solution Approach 1:
The extension device is designed with a nested structure where the tube-like body contains internal components and the bone anchor can be inserted into and removed from the extension device. The blocking mechanism is nested within the extension device structure, allowing compact integration while maintaining the extended leverage arm length needed for effective manipulation during surgery.
3Manufacturing precision
If the force introduction section is positioned closer to the pivot axis for better control, then manufacturing precision is improved, but ease of operation worsens due to reduced accessibility
Solution Approach 1:
The device architecture separates the control functions into different spatial dimensions and locations. The force introduction section is positioned at one location along the extension device while the pivot axis is located at another position, creating a moment arm that provides both precise control and adequate accessibility. The receptacle and actuation mechanisms are arranged in three-dimensional space to allow surgeon access from appropriate angles while maintaining precise force application relative to the pivot axis.
Data Source
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AI summary
The invention relates to a device (10) for correcting a bone fracture using bone anchors (14), in particular bone screws (14), and extension devices (12) attachable to the bone anchors (14).