PPG Signal Analysis for Non-Invasive Pain Monitoring
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Solution Overview
Problem
Current pain management monitoring techniques are inadequate for unconscious or sedated patients and children, as they cannot communicate their pain needs effectively, and existing methods for continuous non-invasive blood pressure monitoring are invasive or cumbersome.
Innovation Solution
The use of photoplethysmograph (PPG) signals to monitor physiological parameters such as blood pressure, respiration rate, and respiration effort, allowing for continuous non-invasive blood pressure monitoring and pain management assessment through a single sensor, combined with continuous wavelet transforms to analyze PPG signals for accurate parameter calculation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If continuous non-invasive blood pressure monitoring is implemented using traditional methods, then blood pressure can be monitored continuously, but the monitoring device becomes invasive or cumbersome
Solution Approach 1:
The patent replaces traditional mechanical blood pressure monitoring devices with an optical-based photoplethysmograph (PPG) system. The PPG sensor detects blood volume changes through optical signals, eliminating the need for invasive catheters or cumbersome mechanical cuffs, thus achieving continuous non-invasive blood pressure monitoring
Solution Approach 2:
The patent introduces photoplethysmographic signals as an intermediary to indirectly measure blood pressure. Instead of directly measuring pressure mechanically, the system uses optical signals that correlate with blood volume changes, serving as a mediator to derive blood pressure information non-invasively
2Measurement precision
If physiological monitoring is performed on unconscious or sedated patients, then pain management can be assessed, but the patients cannot communicate their pain needs
Solution Approach 1:
The patent enables the patient's body to communicate pain status through physiological signal changes. The system detects pain-related physiological variations (heart rate, respiration, blood pressure) without requiring patient awareness or communication, allowing the body itself to provide the information needed for pain assessment
Solution Approach 2:
The patent uses physiological parameters as intermediaries to convey pain information. Since unconscious or sedated patients cannot directly communicate pain, the system measures physiological changes (heart rate variability, respiration patterns, blood pressure fluctuations) that serve as indirect indicators of pain status
3Measurement precision
If multiple sensors are used for comprehensive physiological monitoring, then accurate pain management assessment can be achieved, but the device complexity increases
Solution Approach 1:
The patent makes the photoplethysmograph sensor universal by enabling it to detect multiple physiological parameters simultaneously. The same PPG sensor measures blood volume changes, heart rate, respiration rate, and blood pressure, eliminating the need for separate sensors for each parameter and thus reducing overall device complexity
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 pain management monitoring in unconscious or sedated patients by accurately tracking physiological changes indicative of pain or pain medication efficacy, providing a comprehensive and non-invasive solution for continuous blood pressure and respiration rate measurement.
Implementation Method 1
physiological parameters, such as one or more vital signs of a patient may be used to monitor effectiveness of pain management. For example, when a patient is sedated, anesthetized or otherwise provided pain medication, the patient may experience certain physiological effects
Implementation Method 2
continuous wavelet transforms to analyze PPG signals for accurate parameter calculation
Data Source
AI summary
The present disclosure relates to systems and methods for monitoring pain management using measurements of physiological parameters based on a PPG signal. A reference physiological parameter may be compared against a later measurement to identify a change in condition that may indicate a pain management problem.