Wrist-Worn Pulse Wave Sensor with Differential Noise Reduction
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Solution Overview
Problem
Conventional pulse wave sensors face challenges in continuous measurement due to the need to restrict user behavior and are prone to noise interference from movement or vibration, limiting their ability to accurately measure pulse waves over extended periods.
Innovation Solution
A pulse wave sensor designed as an armlet worn on the wrist, featuring multiple light sensors, a power source, and a communication unit, with a controller that manages sensor operation and data transmission, and incorporates a differential signal processing circuit to reduce noise interference, allowing for continuous and accurate pulse wave measurement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of moving object
If a conventional pulse wave sensor is used at the fingertip, then the pulse wave can be measured for short periods, but the examinee's behavior must be restricted and continuous long-term measurement is difficult
Solution Approach 1:
The invention divides the measurement system into two independent parts: a sensor unit that can be easily attached to the fingertip and a main body unit that contains the control circuitry. This segmentation allows the sensor to remain on the fingertip during natural activities while the main body processes data, enabling long-term measurement without restricting user behavior.
Solution Approach 2:
A wireless communication module serves as an intermediary between the sensor unit and main body unit, allowing data transmission without physical connection. This eliminates the need for cables that would restrict movement, enabling users to perform daily activities freely while maintaining continuous measurement capability.
2Measurement precision
If a conventional pulse wave sensor is used, then the measurement can be performed with simple construction, but motion noise from movement or vibration prevents successful measurement
Solution Approach 1:
The control circuit continuously monitors the pulse wave signal quality and dynamically adjusts measurement parameters or activates noise filtering algorithms when motion noise is detected. This feedback mechanism maintains measurement accuracy even during physical activity by compensating for motion-induced disturbances in real-time.
Solution Approach 2:
The system changes measurement parameters such as light emission intensity, sampling frequency, and filtering characteristics based on detected motion levels. When motion noise is high, the system increases light intensity and applies more aggressive filtering, while maintaining normal parameters during rest periods, thus optimizing measurement accuracy across different activity states.
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
Enables continuous pulse wave measurement without restricting user behavior and effectively reduces motion noise interference, improving measurement accuracy and user convenience.
Implementation Method 1
a light emitting portion to emit a light to a fingertip of the examinee, and a light receiving portion to detect an intensity of the light penetrates through a living body
Data Source
AI summary
Among the technical characteristics disclosed in this specification, the pulse wave sensor with one of the technical characteristic includes a construction to detect the pulse wave at a wrist (i.e., a construction to measure the pulse wave to be worn at the wrist). To be more concrete, the pulse wave sensor includes a measurement unit to measure the pulse wave, a power source unit to supply power to the measurement unit, a cable to connect between the measurement unit and the power source unit electrically, and a armlet type housing to contain the measurement unit, the power source unit, and the cable.