Plethysmographic Detection of Respiratory Arterial Pressure Wave

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Solution Overview

Problem

Current methods for assessing and monitoring heart rate variability do not directly address the underlying dynamic respiratory arterial pressure wave, which is a primary physiological phenomenon influencing autonomic nervous system regulation and heart rate variability, as there is little recognition or monitoring of this wave.

Innovation Solution

Employing plethysmographic detection and monitoring techniques to assess changes in blood volume, specifically using DC optical plethysmographs to detect and characterize the dynamic respiratory arterial pressure wave, allowing for direct monitoring and biofeedback of this wave without relying on heart rate variability measurements.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If heart rate variability monitoring is used to assess physiological status, then autonomic nervous system regulation can be evaluated, but the underlying respiratory arterial pressure wave is not directly monitored

Engineering Contradiction:

Improvephysiological assessment accuracyVSAvoidrespiratory arterial pressure wave data

Core Design Contradiction:

Measurement precisionVSLoss of information

Solution Approach 1:

The patent introduces a respiratory inductance plethysmograph as an intermediary device to directly detect the respiratory arterial pressure wave. This mediator captures the pressure wave information that was previously lost or indirect in HRV monitoring, allowing simultaneous measurement of both the pressure wave and its physiological effects.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The patent replaces the indirect mechanical pulse detection method with an optical detection system using LED light sources and photodetectors. This substitution allows non-invasive measurement of blood volume changes and respiratory pressure waves through tissue transmission, eliminating the need for direct arterial catheterization.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

2Measurement precision

If direct monitoring of respiratory arterial pressure wave is implemented, then first-order physiological data is obtained, but device complexity increases

Engineering Contradiction:

Improverespiratory pressure wave detectionVSAvoidmonitoring system structure

Core Design Contradiction:

Measurement precisionVSDevice complexity

Solution Approach 1:

The patent designs a multi-functional monitoring system where the same plethysmograph hardware can detect both respiratory pressure waves and heart rate variability. The system uses universal signal processing algorithms that can analyze different physiological parameters from the same sensor data, reducing overall system complexity while maintaining comprehensive monitoring capabilities.

Inventive Principle:

Principle #6Universality (Multi-functionality)

Solution Approach 2:

The patent creates a simplified optical copy of the complex arterial pressure wave measurement system. Instead of using invasive pressure transducers directly in arteries, the system uses optical plethysmography to create a non-invasive replica measurement of blood volume changes that mirrors the pressure wave characteristics.

Inventive Principle:

Principle #26Copying

3Measurement precision

If plethysmographic technique is used to detect blood volume changes, then respiratory arterial pressure wave can be monitored, but measurement interpretation becomes more complex

Engineering Contradiction:

Improveblood volume wave detectionVSAvoidsignal analysis complexity

Core Design Contradiction:

Measurement precisionVSDifficulty of detecting and measuring

Solution Approach 1:

The patent segments the complex plethysmographic signal into distinct physiological components: respiratory pressure wave, heart rate variability, and baseline blood volume. By separating these components through signal processing, the system makes interpretation easier while maintaining measurement precision for each individual parameter.

Inventive Principle:

Principle #1Segmentation

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 effective monitoring and biofeedback of the dynamic respiratory arterial pressure wave, providing first-order physiological data for diagnostic and remedial purposes, correlating with systolic and diastolic arterial pressures and improving health by optimizing breathing patterns.

Implementation Method 1

employing plethysmographic detection and monitoring techniques to assess changes in blood volume, specifically using DC optical plethysmographs to detect and characterize the dynamic respiratory arterial pressure wave

Methodology Applied

Scientific EffectOptical absorption: Absorption (EM radiation)

Data Source

PatentUS7922664B2Method and system for improving physiologic status and health via assessment of the dynamic respiratory arterial pressure wave using plethysmographic technique

Publication Date: 2011.04.12 COHERENCE LLC

AI summary

The present invention specifies a method and system for assessing the dynamic respiratory arterial pressure wave using plethysmographic sensing techniques. The dynamic respiratory arterial pressure wave is measured and plotted for purposes of diagnosis and or remedial biofeedback.