Sensor-Integrated External Fixation Strut Length Adjustment
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Solution Overview
Problem
Existing external fixation systems face challenges with manual and cumbersome strut length adjustments, leading to human errors, frame instability, and inaccurate adjustments, particularly due to the complexity of existing programmable tools requiring patient involvement and measurement.
Innovation Solution
An external fixation strut equipped with an integrated sensor that measures its length and communicates directly with a programmable tool via a data port, eliminating the need for external power and simplifying the adjustment process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If manual adjustment methods are used for external fixation struts, then ease of operation is maintained, but measurement precision and reliability deteriorate due to human errors and frame instability
Solution Approach 1:
The patent replaces manual mechanical measurement and adjustment methods with an automated electronic system. A sensor integrated into the strut mechanically measures the strut length and converts it to an electrical signal, which is then processed by a controller to automatically adjust the strut length according to the treatment plan, eliminating manual measurement errors while maintaining operational simplicity through automation.
2Extent of automation
If programmable tools with external measurement requirements are used, then automation is improved, but device complexity and ease of operation worsen due to additional user tasks and measurement requirements
Solution Approach 1:
The patent merges the measurement function and adjustment function into a single integrated system. The sensor is built directly into the strut structure, and the controller is integrated with the adjustment mechanism. This combination eliminates the need for separate external measurement tools and manual intervention, achieving full automation while reducing overall system complexity.
Solution Approach 2:
The strut system performs self-measurement through the integrated sensor that automatically detects the strut length without external intervention. The controller then automatically executes the adjustment based on the measured data and pre-programmed treatment parameters, enabling the system to serve itself without requiring additional user tasks or external measurement devices.
3Measurement precision
If integrated sensors and data ports are added to struts, then measurement precision and automation are improved, but manufacturing cost and device complexity increase
Solution Approach 1:
The patent applies the sensor and electronic components only at specific locations where measurement data is needed, rather than throughout the entire strut structure. The sensor is positioned at strategic points to detect strut length changes, and the data port is located at the adjustment end, allowing precise measurement while minimizing the amount of expensive electronic materials and manufacturing complexity required.
Data Source
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AI summary
The present disclosure relates to an external fixation strut (200'), comprising: an elongated body (211) comprising at least a first shaft (212) and a second shaft (213) moveable with respect to each other to modify the length of said elongated body (211); at least a sensor (214') integrated in the external fixation strut (200') and adapted to perform at least a measurement which is indicative of the length of the elongated body (211); wherein said sensor (214') communicates with a programmable tool for lengthening/shortening the external fixation strut (200') through a data port which is engageable by said programmable tool.