Laser Blood Pressure Analysis Device Noise Reduction
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Solution Overview
Problem
Existing blood pressure measurement technologies face challenges in accurately calculating systolic and diastolic blood pressures due to noise in artery diameter and blood flow rate measurements, leading to imprecise results.
Innovation Solution
A biological analysis device and method that calculate pulse pressure and average blood pressure indices using a blood flow index derived from a frequency spectrum of light reflected from the body, allowing for precise determination of systolic and diastolic blood pressures through a laser-based measurement system.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If ultrasonic wave radiation method is used to measure blood flow rate and artery diameter, then blood pressure can be calculated, but measurement precision deteriorates due to noise in calculated values
Solution Approach 1:
The patent replaces the ultrasonic wave-based mechanical measurement system with an optical measurement system using laser beams. The laser beam intensity spectrum is used to calculate blood flow index, which then determines blood pressure. This substitution of measurement physics (from acoustic to optical) eliminates the noise problems associated with ultrasonic artery diameter calculations while maintaining blood pressure measurement capability.
Solution Approach 2:
The patent changes the measurement parameters from direct artery diameter and blood flow rate (derived from ultrasonic waves) to blood flow index (derived from laser beam intensity spectrum). This parameter transformation allows blood pressure to be calculated through pulse pressure index and average blood pressure index without being affected by the noise that plagues direct artery diameter measurements.
2Measurement precision
If artery diameter calculation is used to determine systolic and diastolic blood pressure, then blood pressure can be estimated, but measurement accuracy deteriorates due to noise in maximum and minimum artery diameter values
Solution Approach 1:
The patent substitutes the ultrasonic artery diameter measurement system with an optical laser-based blood flow index system. By measuring the intensity spectrum of reflected laser light and deriving blood flow index from it, the system avoids the noise contamination that affects maximum and minimum artery diameter calculations, thereby preserving critical information for accurate systolic and diastolic blood pressure determination.
Solution Approach 2:
The patent introduces blood flow index as an intermediary parameter between the measurement signal and blood pressure calculation. Instead of directly using noisy artery diameter extremes, the system uses the blood flow index (derived from laser intensity spectrum) as a mediator to calculate pulse pressure index and average blood pressure index, which then yield accurate systolic and diastolic values without information loss.
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 solution enables high-precision calculation of systolic and diastolic blood pressures by reducing the impact of noise and skin thickness variations, improving measurement accuracy and reducing physical load on the subject.
Implementation Method 1
an intensity spectrum related to a frequency of light reflected and received from an inside of the biological body through radiation of a laser beam
Data Source
AI summary
A biological analysis device includes: a pulse pressure calculation unit that calculates a pulse pressure index related to a pulse pressure of a biological body; an average blood pressure calculation unit that calculates an average blood pressure index related to an average blood pressure of the biological body; and a blood pressure calculation unit that calculates a systolic blood pressure and a diastolic blood pressure in accordance with the pulse pressure index and the average blood pressure index. At least one of the pulse pressure index and the average blood pressure index is calculated in accordance with a blood flow index which is calculated from an intensity spectrum related to a frequency of light reflected and received from an inside of the biological body through radiation of a laser beam and is related to a blood flow of the biological body.