Embedded Signal-Processing Wearable Band for Reliable Electrode Contact
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Solution Overview
Problem
Wearable electronic devices with signal-processing components are often bulky and uncomfortable, leading to poor user experience and social acceptability, particularly due to inadequate form factors and issues with electrode contact for users with varying body types.
Innovation Solution
A wearable electronic device design featuring a cinch structure for secure fitting, separate band portions with and without electrical components, and customizable electrode dimensions based on user body types, along with a compute core and signal-processing components for efficient biopotential signal detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If wearable electronic devices include signal-processing components and multiple sensors to meet sensing requirements, then sensing capability is improved, but device size and weight increase making it bulky and uncomfortable
Solution Approach 1:
The wearable device is divided into modular components: a flexible circuit board with signal-processing components is separated from the sensor array, allowing sensors to be distributed across the band while processing components are consolidated. This segmentation enables reduced device weight while maintaining sensing capability through distributed sensor placement and centralized processing.
Solution Approach 2:
The flexible circuit board is configured to wrap around the wrist in a three-dimensional manner, transitioning from a flat two-dimensional layout to a curved three-dimensional structure. This dimensional change allows the circuit board to conform to the wrist anatomy, distributing components across the curved surface area and reducing the need for bulky housing while maintaining all necessary sensing and processing functions.
2Measurement precision
If wearable electronic devices include signal-processing components and multiple sensors, then sensing capability is improved, but device volume increases making it bulky and uncomfortable
Solution Approach 1:
A flexible circuit board serves as the structural substrate for signal-processing components, replacing rigid circuit boards and bulky housings. The flexible film structure allows components to be mounted on a thin, conformable surface that wraps around the wrist, dramatically reducing device volume while maintaining all necessary electronic functions and sensing capability.
Solution Approach 2:
The flexible circuit board with signal-processing components is nested within or integrated with the band structure itself. The circuit board is positioned within the band's cross-sectional profile, utilizing the existing band volume rather than adding external bulk, thereby reducing overall device volume while maintaining sensing and processing capabilities.
3Reliability
If electrode height is increased to ensure sufficient electrical contact for users with varying body types, then contact reliability is improved, but device complexity and adjustment requirements increase
Solution Approach 1:
The band structure incorporates an adjustable mechanism that allows the user to dynamically modify the band's circumference and tension. This dynamic adjustment enables the same electrode configuration to maintain reliable electrical contact across users with different wrist sizes and body types, eliminating the need for multiple fixed electrode heights or complex switching mechanisms.
Solution Approach 2:
The adjustable band mechanism changes the physical parameters of the band (circumference, tension, compression force) to optimize electrode-skin contact. By varying these parameters rather than changing electrode geometry, the system maintains contact reliability across different users while keeping the electrode structure simple and fixed.
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 design provides a comfortable, durable, and socially acceptable wearable device that efficiently detects biopotential signals, improving user interaction with computing systems and artificial-reality environments.
Implementation Method 1
The frictional force applied by the cinch structure is configured to be maintained adjacent to the adjustment length of the second band portion while the adjustable band is worn by the user such that the first circumference of the adjustable loop is also maintained.
Data Source
AI summary
An example band structure is provided which includes a first portion having an embedded structural member for holding one or more signal-processing components in fixed positions within the first portion of the band structure. The first portion also includes the one or more signal-processing components, which are coupled to the embedded structural member, and the one or more signal-processing components are configured to at least partially process neuromuscular signals. And the first portion includes one or more neuromuscular-signal-sensing electrodes attached to the first portion of the band structure and electrically coupled to the one or more signal-processing components. The band structure also includes a second portion that does not include any electrical components, where the first portion of the band structure and the second portion of the band structure are each configured to couple directly to one another to form a loop sized to accommodate a wrist of a user.