External Fixator Actuation Unit with Feedback
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Solution Overview
Problem
Existing external fixator systems for bone deformity correction are difficult for patients to adjust daily due to limited access and lack of feedback on the quantity of actuation, making it challenging to maintain stable fixation and adjust strut lengths effectively.
Innovation Solution
An external fixator system with an actuation unit that provides feedback through a spring-loaded ball mechanism, allowing for ergonomic access and adjustment of strut length and orientation between fixation plates, featuring a socket for tool actuation and a compact design with haptic, audible, and visual feedback.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If traditional nut-and-wrench adjustment mechanisms are used at the ends of struts, then the fixation system can be adjusted, but the patient has limited access and difficulty making daily adjustments
Solution Approach 1:
The actuation unit is repositioned from the traditional end-position of struts to a central location on the fixation plate, changing the spatial dimension of access. This allows the patient to reach adjustment points from the top/side of the frame rather than from the distant ends of long struts, significantly improving ergonomics and accessibility for daily adjustments
2Loss of information
If traditional adjustment mechanisms are used, then the structure can be simple, but the patient receives no feedback on the quantity of actuation made
Solution Approach 1:
The actuation unit incorporates a feedback mechanism that provides the patient with information about the quantity of actuation made. This allows the patient to gain knowledge about the adjustment being made to each strut, enabling better control and understanding of the deformation correction process without requiring complex electronic systems
3Volume of moving object
If the actuation unit is integrated into the fixation plate, then the structure becomes compact, but the mechanism must be more complex to achieve fixed connection
Solution Approach 1:
The actuation unit is merged with the fixation plate structure, with the actuation mechanism integrated directly into the plate body. This consolidation reduces the overall volume and eliminates separate mounting components, achieving a compact design while maintaining secure fixed connection through direct structural integration
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enhances patient compliance by providing clear feedback and easier access to adjustment points, allowing precise and safe adjustments of strut lengths and orientations, improving the effectiveness of deformity correction.
Implementation Method 1
feedback unit which provides a user with a feedback concerning the degree of the actuation
Data Source
AI summary
An external fixator system comprising at least two fixation plates which are arranged at a distance to each another, at least one adjustable length strut having a first end region and a second end region which are in connection with the fixation plates and at least one actuation unit to adjust the length of the strut in order to adjust the distance and/or orientation between the fixation plates. The actuation unit is in a fixed connection with at least one of the fixation plates as well as with at least one of the end regions of the respective strut in order to connect the strut with the fixation plate. The actuation unit comprises a feedback unit which provides the user with a feedback concerning the degree of the actuation.