Bidirectional Thermally Actuated Component for Medical Devices
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Solution Overview
Problem
Conventional medical devices for alignment, compression, and traction often rely on manually actuated or electrically powered mechanisms, which are prone to errors, malfunctions, and are costly, with potential for catastrophic failures, and require frequent medical visits for verification.
Innovation Solution
A bidirectional thermally actuated component using a material that transitions between solid and fluid states based on temperature, such as eutectic wax, to provide predictable expansion and contraction, integrated with a control circuit for safe and controlled operation, and communication capabilities for remote monitoring.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If manually actuated adjustment elements are used, then device complexity is reduced, but reliability deteriorates due to user error and incomplete input
Solution Approach 1:
The system performs self-adjustment through automated control algorithms that monitor sensor data and modify device parameters without requiring manual user input. The processor automatically interprets sensor signals and actuates components to maintain optimal alignment, eliminating user error while preserving simple device architecture.
Solution Approach 2:
The system incorporates sensors that continuously monitor device position and alignment, feeding this data back to a processor that automatically adjusts parameters. This closed-loop feedback mechanism ensures reliable operation by constantly verifying and correcting alignment without requiring manual verification or adjustment by the user.
2Reliability
If electric motors and gears are used, then reliability improves through automated control, but device complexity increases
Solution Approach 1:
The system replaces complex mechanical transmission components like gears and motors with direct-actuation mechanisms controlled by electronic sensors and processors. This substitution maintains automated reliability while reducing mechanical complexity by using electronic control signals rather than mechanical power transmission chains.
Solution Approach 2:
The processor and sensor system serve multiple functions simultaneously: monitoring alignment, interpreting user input, controlling actuation, and providing feedback. This multi-functionality consolidates what would otherwise require separate specialized components, reducing overall device complexity while maintaining automated reliability.
3Adaptability or versatility
If powered devices with unlimited travel range are used, then adaptability improves, but harmful factors increase due to runaway error and catastrophic failure
Solution Approach 1:
The system incorporates pre-programmed safety limits and boundary conditions that prevent the device from operating beyond safe parameters. The processor monitors position and alignment continuously and automatically stops actuation when approaching predefined safety thresholds, preventing runaway errors before they can occur while still allowing full adaptability within safe operating ranges.
4Measurement precision
If conventional devices require frequent medical visits for verification, then measurement precision is maintained, but loss of time increases
Solution Approach 1:
The system incorporates sensors that continuously monitor device position and alignment, providing real-time feedback on measurement precision. This continuous electronic monitoring maintains precise alignment measurements without requiring periodic manual verification during medical visits, thereby preserving measurement accuracy while eliminating time loss associated with frequent appointments.
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
The component ensures finite and controlled output, reducing the risk of errors and malfunctions, allowing for remote monitoring and reducing the need for frequent medical visits, while maintaining precise adjustments.
Implementation Method 1
a thermally responsive material stored in the flexible container; a heating element positioned such that heat from the heating element melts the thermally responsive material when the heating element is activated
Implementation Method 2
the flexible container expands into the expanded position and the thermally responsive material compresses as it cools when the heating element is deactivated
Data Source
AI summary
A bidirectional thermally actuated component includes a heating element and wax material provided in an enclosed housing wherein the heating element is activated to melt the wax which expands to cause movement of the housing or an element mounted therein. When the heating element is deactivated, the was hardens and constricts to allow for movement in the opposite direction based on application of a force in the opposite direction, which may be provided by a biasing spring or a second actuator. An adjustable medical device may include the thermally actuated component to control adjustment of the device.