External Fixation Device Movable Carriage Bone Alignment
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Solution Overview
Problem
Existing linear based systems for correcting long bone deformities require complex reconfiguration due to changes in bone alignment during the correction process, with weak connections between rail segments and limited flexibility in accommodating varying deformities.
Innovation Solution
An external fixation system featuring a movable carriage with a drive system and lock mechanism on an elongate beam element, allowing for adjustable positioning and secure locking along the beam, along with supplementary beam elements and hinge elements for enhanced flexibility and stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If linear based systems use fixed rail configurations, then structural stability is maintained, but adaptability to changing bone deformities deteriorates
Solution Approach 1:
The patent implements a movable carriage system that can be repositioned along the rail at different locations. This dynamic reconfigurability allows the fixation device to adapt to changing bone deformities during the correction process while maintaining structural stability through the rigid rail and carriage locking mechanism.
Solution Approach 2:
The fixation system is divided into modular components including separate rails, carriages, and bone anchor assemblies. This segmentation enables independent adjustment of carriage positions along the rail without affecting the overall structural integrity, providing both stability and adaptability.
2Adaptability or versatility
If multiple rail segments are connected to accommodate deformities, then adaptability improves, but connection weakness and device complexity increase
Solution Approach 1:
The carriage serves multiple functions: it acts as a structural connector between bone anchors and the rail, provides a movable mounting point for adjustment, and maintains load-bearing capacity. This multi-functionality eliminates the need for separate connection components, strengthening the overall structure while maintaining adaptability.
3Adaptability or versatility
If threaded rods and nuts are used for elongation, then adjustability is achieved, but device complexity and potential weak points increase
Solution Approach 1:
The carriage integrates the bone anchor mounting function with the elongation adjustment function into a single component. The bone anchor is directly mounted to the carriage body, eliminating the need for separate rods and nuts, thereby reducing device complexity while maintaining full adjustability for bone lengthening.
Data Source
AI summary
An external fixation system for the correction of long bone deformities includes an elongate beam element having an engagement feature along a longitudinal edge of the elongate beam element, a connector element secured to the elongate beam and structurally configured to support a first bone anchor extending from the external fixation system, and a movable carriage engaged with the engagement feature along the longitudinal edge of the elongate beam element and selectively movable along the engagement feature of the elongate beam element. The movable carriage is selectively lockable into a position along the elongate beam element. The movable carriage is structurally configured to support a second bone anchor extending from the external fixation system.