Blood-Flow Suppressing Section for Stable Pulse Detection
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Solution Overview
Problem
Conventional pulse data detecting apparatuses face challenges in accurately measuring pulse data due to variations in body surface conditions, such as uneven skin, body hair, and ambient noise, leading to unreliable results.
Innovation Solution
A pulse data detecting apparatus with a blood-flow suppressing section that protrudes to increase blood pressure in the measurement region, allowing for stable pulse data detection by reducing blood flow and enhancing signal quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional optical pulse detection is used on body surface, then pulse data can be obtained through light absorption measurement, but measurement accuracy deteriorates due to body surface conditions such as uneven skin, body hair, and ambient light interference
Solution Approach 1:
A blood flow suppressing section is introduced as an intermediary component between the light source and the body surface. This section temporarily suppresses blood flow in the measurement region, creating a more stable optical path that reduces interference from blood flow variations, body surface unevenness, and ambient light, thereby improving pulse data detection accuracy
Solution Approach 2:
The invention changes the physiological parameter of blood flow in the measurement region by applying temporary compression. This parameter change stabilizes the blood flow state during measurement, reducing fluctuations that would otherwise interfere with optical pulse detection and improving measurement precision under various body surface conditions
2Reliability
If blood flow is suppressed to increase blood pressure in measurement region, then signal quality is enhanced for stable pulse detection, but blood flow is reduced which may affect measurement representativeness
Solution Approach 1:
The blood flow suppression is applied periodically rather than continuously - activated only during the measurement phase and released afterward. This periodic application ensures measurement stability when needed while allowing normal blood flow to resume, maintaining the representativeness of pulse data and preventing prolonged physiological effects
Solution Approach 2:
The compression is applied locally to a specific measurement region rather than affecting the entire circulatory system. This partial action confines the blood flow suppression to the immediate measurement area, minimizing the impact on overall blood flow and ensuring that the suppressed region provides stable signals without compromising systemic circulation
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 apparatus achieves stable and accurate pulse measurement across various conditions by suppressing blood flow and enhancing signal quality, resulting in reliable pulse data output.
Implementation Method 1
Based on using the fact that the light absorption amount changes with change in concentration (density) of hemoglobin flowing through capillary vessels distributed over the body surface
Implementation Method 2
a (so-called optical) method of using the principle that the light amount of reflected light changes with heartbeat
Data Source
AI summary
A pulse data detecting apparatus, pulse data detecting method, and pulse data detection program are provided capable of suppressing an influence of the condition of the body surface to be measured and obtaining an appropriate measurement result under a wide range of conditions. In the present invention, a blood-flow-suppressing-projection protrusion-control mechanism section causes a blood-flow-suppressing projection to protrude to press or compress the body surface to suppress a blood flow on a downstream side, thereby increasing a blood pressure of a measurement region at the time of measurement. A light-receiving element receives reflected light of light applied from a light-emitting element to a skin surface, and outputs an electrical signal. Increasing the blood pressure of the measurement region enables to obtain an output signal at a sufficient output level from the light-receiving element. A CPU calculates a pulse rate based on the output signal from the light-receiving element.