PPG and Secondary Sensor Respiratory Monitoring
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Solution Overview
Problem
There is a critical need for non-invasive, reliable monitoring of respiratory parameters in non-intubated patients, as existing technologies are inadequate for ambulatory patients and those receiving patient-controlled anesthesia, particularly in identifying respiratory depression or arrest.
Innovation Solution
The use of photoplethysmography (PPG) sensors in conjunction with secondary respiration sensors to determine respiratory attempts and effective ventilation, allowing for the assessment of respiratory effectiveness and differentiation between central and obstructive apnea.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional respiratory monitoring equipment is used, then reliable respiratory parameter measurement is achieved, but the equipment requires intubation and mechanical ventilation which limits applicability to non-intubated patients
Solution Approach 1:
The patent replaces mechanical respiratory monitoring systems (pressure transducers, flow transducers requiring intubation) with optical detection systems (PPG sensors, capnography) that can measure respiratory parameters non-invasively through skin or breath analysis, enabling monitoring of non-intubated patients while maintaining measurement reliability
Solution Approach 2:
The patent introduces intermediary measurement methods such as capnography (measuring CO2 in exhaled breath) and PPG (measuring blood volume changes through light absorption) as mediators to indirectly assess respiratory parameters without requiring direct mechanical access to the airway, thus bridging the gap between reliable measurement and non-invasive application
2Measurement precision
If intensive respiratory monitoring is implemented, then respiratory parameters can be precisely measured, but the complexity and cost of equipment increases
Solution Approach 1:
The patent makes existing monitoring equipment multi-functional by enabling PPG sensors and capnography devices to perform both their primary functions (cardiac monitoring, breath analysis) and respiratory effectiveness assessment simultaneously, eliminating the need for separate complex monitoring systems and reducing overall device complexity while maintaining measurement precision
Solution Approach 2:
The patent combines multiple measurement modalities (PPG optical detection, capnography CO2 measurement, respiratory flow monitoring) into an integrated system that assesses respiratory effectiveness through a unified approach, reducing the complexity associated with multiple separate monitoring devices while achieving comprehensive precise measurement
3Reliability
If respiratory monitoring is provided for non-intubated patients, then patient safety is improved, but the ability to accurately differentiate between central and obstructive apnea is compromised
Solution Approach 1:
The patent implements feedback mechanisms where PPG signal characteristics (amplitude, frequency, waveform morphology) and capnography data are continuously analyzed and compared against reference patterns to differentiate between central and obstructive apnea, providing real-time feedback that maintains both patient safety monitoring and diagnostic precision
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 of respiratory efforts and ventilation in non-intubated patients, reducing the risk of respiratory depression and arrest by providing accurate and reliable data on respiratory parameters, thereby improving patient safety.
Implementation Method 1
determining whether a respiratory attempt in the individual occurred based on photoplethysmography (PPG) signals obtained from a PPG sensor
Data Source
AI summary
The present invention relates to systems and methods for comparing photoplethysmography (PPG) signals from an individual with signals from a secondary respiration sensor secured to the individual to determine whether effective respiration has occurred or whether the individual has apnea, hypopnea, or other respiratory distress.