Pulse Wave Sensor Device with Blood Flow Blockage Reducing Part
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Solution Overview
Problem
Existing pulse wave sensor devices face challenges in detecting pulse waves due to blood flow blockage when the finger is strongly pressed or during physical activity, leading to unstable measurements and user discomfort.
Innovation Solution
The pulse wave sensor device is designed with a light emitter and receiver positioned on the palm, excluding the center and wrist-side portions, and incorporates a blood-flow blockage reducing part with a step formation to minimize compression and maintain stable blood flow, allowing for easy detection of pulse waves even under strong pressure or movement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the finger is strongly pressed to the light emitter or light receiver to ensure contact, then the light contact reliability is improved, but the blood flow in arteries is blocked causing pulse wave detection failure
Solution Approach 1:
The device is divided into multiple functional components: a pressing force detecting means that independently monitors compression levels, a light emitter and receiver that perform the actual measurement, and a control means that processes both the pulse wave signal and pressing force data. This segmentation allows the system to detect light contact reliably while simultaneously monitoring for harmful compression levels, resolving the contradiction between ensuring contact and preventing blood flow blockage.
2Loss of information
If pressing force detecting means is added to monitor compression levels, then the information about measurement validity is improved, but the device complexity increases
Solution Approach 1:
The control means serves multiple functions: it processes the pulse wave signal from the light receiver, analyzes the pressing force signal from the pressing force detecting means, determines measurement validity, and controls the output display. By making the control means multi-functional, the patent adds pressing force monitoring and measurement validity assessment without requiring separate dedicated processing units, thus minimizing the increase in device complexity while still providing comprehensive measurement validity information.
3Stability of the object's composition
If the light emitter protrudes to reliably contact the finger, then the contact stability is improved, but the pressing force required to maintain contact increases causing pulse wave detection failure
Solution Approach 1:
The pressing force detecting means provides continuous feedback about the compression level applied to the finger. The control means uses this feedback information to determine whether the pressing force has exceeded the threshold that would block blood flow. This feedback mechanism allows the system to maintain stable contact through the protruding light emitter while actively monitoring and identifying when the contact force becomes harmful, enabling the user to adjust pressure appropriately.
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 configuration reduces blood flow blockage and allows for stable pulse wave detection, minimizing user burden and maintaining measurement accuracy during various activities.
Implementation Method 1
a light emitter that outputs light to a living body and a light receiver that receives light, which is emitted from the light emitter and reflected by the living body
Data Source
AI summary
A light emitter and a light receiver are provided at a side surface of a lever. When a user grips the lever with his hand, the light emitter and the light receiver are positioned close to bases of the middle finger, a ring finger, and a little finger, as a measurement portion of a palm. A blood-flow blockage reducing component protrudes to contact a portion between the index finger and the middle finger, and a thumb, as a contact portion of the palm.