Wearable Tremor and Motion Sensor Structure for Accurate Activity Detection
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Solution Overview
Problem
Existing biological activity detection sensors, such as those described in Patent Literature 1, face inaccuracies in detecting biological activity due to reliance on myoelectric potential and require multiple wearable electrodes, leading to a complex configuration.
Innovation Solution
A biological activity detection sensor incorporating a motion detection sensor and a tremor sensor, with a deformable first member and a less deformable second member, accurately detects slight tremors and larger movements by utilizing a piezoelectric film and insulating substrate, respectively, without direct skin contact.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple wearable electrodes are directly attached to the living body for myoelectric potential measurement, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The sensor is divided into two distinct members with different deformation characteristics: a first member that easily deforms to detect tremors and a second member that hardly deforms to detect larger movements. This segmentation allows each member to specialize in detecting specific types of biological activity, improving overall detection accuracy while simplifying the overall configuration compared to multiple electrodes
Solution Approach 2:
Different regions of the sensor have different mechanical properties - the first member is designed to be flexible and deformable for detecting subtle tremors, while the second member is designed to be rigid and stable for detecting larger movements. This local differentiation of material properties enables accurate detection of various biological activities without requiring multiple separate electrodes
2Device complexity
If only myoelectric potential is used for detection, then device complexity is reduced, but measurement precision deteriorates
Solution Approach 1:
The patent combines two different detection mechanisms - tremor detection through the deformable first member and motion detection through the rigid second member - into a single integrated sensor. This merging of detection functions improves measurement precision by capturing multiple aspects of biological activity simultaneously, while maintaining relatively simple device complexity compared to multiple separate electrode systems
3Manufacturing precision
If a rigid structure is used for the sensor, then manufacturing precision is improved, but adaptability to living body movements deteriorates
Solution Approach 1:
The sensor structure is segmented into a first member with high flexibility for adapting to body movements and a second member with high rigidity for manufacturing precision. This segmentation allows each component to optimize its properties for its specific function while maintaining overall sensor integrity
Solution Approach 2:
The sensor employs composite construction combining flexible and rigid materials in a single device. The first member uses flexible materials that can deform with body movements, while the second member uses rigid materials that maintain their shape for accurate motion detection, creating a composite structure that satisfies both adaptability and manufacturing precision requirements
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 sensor provides accurate detection of biological activity with improved usability by combining tremor and motion sensors, reducing complexity and discomfort while maintaining sensitivity and robustness.
Implementation Method 1
using a piezoelectric film as the tremor sensor
Data Source
AI summary
A biological activity detection sensor is provided that includes a motion detection sensor that detects motion of a living body, a tremor sensor that detects a tremor of the living body, and a base member that can be mounted on the living body. The base member includes a first member that is deformable in accordance with a mounted state on the living body, and a second member that is less deformable than the first member. The tremor sensor is provided in the first member, and the motion detection sensor is provided in the second member.