Segmented Strap Sensor for Wrist Positioning Accuracy
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Solution Overview
Problem
One-size-fits-all sensor wristbands are ineffective due to varying wrist circumferences and shapes, requiring expert positioning for accurate psychophysiological parameter sensing, which is costly and complex.
Innovation Solution
A strap-based sensor device with adjustable ends, user interface, data storage, and markers for precise positioning and tightening, allowing two-sided adjustment and length customization using a segmented pattern for optimal electrode placement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a one-size-fits-all sensor wristband is used, then manufacturing cost and device complexity are reduced, but measurement precision and positioning accuracy deteriorate due to varying wrist circumferences and shapes
Solution Approach 1:
The strap is divided into multiple segments that can be independently adjusted in length. This segmentation allows the strap to be customized for different wrist sizes and shapes while maintaining a relatively simple overall device structure, resolving the contradiction between measurement precision and device complexity
Solution Approach 2:
The strap incorporates adjustable fastening mechanisms that allow dynamic adaptation to different wrist circumferences. This dynamic adjustability enables precise positioning for accurate measurements without requiring complex custom-designed straps for each user
2Measurement precision
If expert positioning is implemented for optimal sensor placement, then measurement precision improves, but ease of operation and cost increase
Solution Approach 1:
The strap includes pre-marked positioning indicators and pre-configured segment lengths that guide users to the correct sensor placement locations. This preliminary preparation eliminates the need for expert positioning while maintaining measurement precision and simplifying user operation
Solution Approach 2:
The adjustable strap design with clear markings and intuitive fastening mechanisms enables users to independently position and adjust the sensor device correctly without requiring expert assistance, thereby improving ease of operation while maintaining positioning accuracy
3Adaptability or versatility
If the strap is made adjustable for different wrist sizes, then adaptability improves, but device complexity and manufacturing difficulty increase
Solution Approach 1:
The strap is constructed from standardized segments that can be manufactured using simple, repeatable processes. This segmentation approach achieves high adaptability to different wrist sizes while keeping manufacturing relatively simple and cost-effective
Solution Approach 2:
The adjustable strap design uses universal components and standardized fastening mechanisms that can serve multiple size requirements. This universality provides broad wrist size adaptability without significantly complicating the manufacturing process
Data Source
AI summary
A sensor device and method for tightening and positioning the sensor device with a wristband or strap (62) for a range of wrist sizes and shapes or other body portions, such that the optimal sensor position is obtained and maintained during ambulatory use, which provides two-sided fastening of the strap (62). The strap (62) has a marker (67) that is positioned by the wearer at a predetermined measuring position, e.g., on the middle of the volar side of the wrist. The wrist is then put on the table to fix its position, and the strap (62) is tightened on both sides of the wrist. This ensures a precision of at least 5 mm of the position of the sensors (66) in the strap.