Rotatable Electrode Turntable for EDA Sensor Signal Alignment
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Solution Overview
Problem
Existing electrodermal activity (EDA) sensors face challenges in achieving high signal-to-noise (S/N) ratios due to random orientations and positions of electrodes relative to eccrine glands, leading to insufficient area overlap and inaccurate readings.
Innovation Solution
A wearable device with rotatable electrodes mounted on a turntable, allowing for adjustment of electrode orientation to maximize area overlap with eccrine glands, thereby optimizing S/N ratios by determining and rotating to the orientation that yields the highest S/N ratio.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If electrodes are fixed in position and orientation on the user's skin, then the device structure is simple, but the signal-to-noise ratio is insufficient due to random alignment with eccrine glands
Solution Approach 1:
The patent applies the dynamics principle by making the electrode assembly rotatable relative to the user's skin surface. The electrodes are mounted on a rotatable platform that can be adjusted to different angular positions, transforming the static fixed-position electrode design into a dynamic adjustable system. This allows the electrodes to be rotated to achieve optimal alignment with eccrine glands, thereby improving the signal-to-noise ratio while maintaining a relatively simple overall device structure.
2Measurement precision
If electrodes are fixed in orientation, then the manufacturing process is simple, but the area overlap with eccrine glands is insufficient leading to inaccurate readings
Solution Approach 1:
The patent implements dynamics by providing an adjustable rotatable platform that holds the electrodes. Instead of manufacturing electrodes with fixed orientations that must precisely match skin gland locations, the system allows post-manufacturing adjustment through rotation. This maintains ease of manufacture for the electrode components themselves while enabling precise orientation adjustment to maximize area overlap with eccrine glands during device assembly or use.
Solution Approach 2:
The patent applies preliminary action by allowing the electrode orientation to be adjusted and optimized before actual EDA measurements are taken. The rotatable platform enables users or operators to pre-align the electrodes with the user's specific eccrine gland distribution pattern, ensuring optimal measurement conditions are established before data collection begins.
3Measurement precision
If electrodes have fixed positions, then the device is simple to operate, but the signal quality varies due to random relationships with gland locations
Solution Approach 1:
The patent applies dynamics by introducing a rotatable platform that enables adjustment of electrode orientation. While this adds a mechanical adjustment component, the operation remains simple through intuitive rotational movement. The system may include indicators or feedback mechanisms to guide users in achieving optimal alignment, maintaining ease of operation while significantly improving signal quality through adjustable positioning that adapts to individual user anatomy.
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
This approach enhances the accuracy of EDA readings by ensuring maximum area overlap between electrodes and eccrine glands, improving the signal quality and consistency of the data collected.
Implementation Method 1
The EDA sensors may use electrodes in physical contact with the user's skin to transmit an electrical current between the electrodes. Based on an estimate of the resistance or conductance encountered during current transmission, an EDA signal may be generated
Data Source
AI summary
A wearable device includes an attachment structure, at least one turntable operably connected to the attachment structure, and a pair of insulatively spaced-apart electrodes affixed to the at least one turntable and structured to contact a skin surface of a user. The turntable and electrodes may form parts of an electrodermal activity (EDA) sensor operably connected to the attachment structure. Use of the turntable enables a rotational orientation of the electrodes to be adjusted so as to achieve maximum available area overlap with eccrine glands located in the skin of a user in contact with the electrodes. This maximum available area overlap may provide a best available S/N ratio for an EDA signal generated based on electrode current transmission through the user's skin.