Dual-PPG Pulse Oximeter for Early Spontaneous Pulse Detection During CPR
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Solution Overview
Problem
Manual palpation for pulse detection during cardiopulmonary resuscitation (CPR) is unreliable and time-consuming, leading to prolonged interruptions in chest compressions, which negatively impact CPR outcomes.
Innovation Solution
A dual-PPG sensor system comprising a central and peripheral PPG sensor integrated into a pulse oximeter, allowing for early detection of spontaneous pulse and qualitative assessment of circulation, providing clinical decision support for CPR management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If manual palpation is used for pulse detection during CPR, then the method is simple to perform, but the detection is unreliable and time-consuming, leading to prolonged interruptions in chest compressions
Solution Approach 1:
The patent replaces the manual mechanical palpation method with an optical detection system (photoplethysmography/PPG). The PPG sensor optically detects blood volume changes to identify spontaneous pulses during CPR, eliminating the need for manual tactile assessment and reducing interruption time while improving detection reliability.
Solution Approach 2:
The patent introduces a PPG sensor as an intermediary device between the rescuer and the patient's circulation system. The sensor acts as a mediator that objectively measures pulse presence without requiring direct physical contact or interruption of compressions, thus resolving the contradiction between reliable detection and minimal interruption.
2Measurement precision
If a single peripheral PPG sensor is used, then the device is simple, but early detection of spontaneous pulse is delayed
Solution Approach 1:
The patent divides the detection system into two separate PPG sensors: one placed centrally (e.g., on the forehead) for early detection of spontaneous pulse, and another placed peripherally (e.g., on the finger) for confirming circulation quality. This segmentation allows each sensor to perform its specific function optimally, improving early detection capability while maintaining manageable device complexity.
Solution Approach 2:
The patent adds a spatial dimension to pulse detection by utilizing both central and peripheral locations on the patient's body. The central PPG sensor detects pulses earlier in the circulation path, providing a time advantage for early ROSC detection, while the peripheral sensor provides complementary information about circulation quality.
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 dual-PPG sensor system enables reliable and timely detection of spontaneous circulation, reducing compression interruptions and improving CPR effectiveness by facilitating informed decision-making on medication administration and cessation of chest compressions.
Implementation Method 1
photoplethysmography (PPG), which is a readily available, non-invasive and easy-to-use optical technology currently widely applied in pulse oximetry
Data Source
AI summary
A PPG pulse oximeter employing a dual PPG probe including a central PPG sensor and a peripheral PPG sensor connectable in a circuit configuration with a pulse oximeter monitor. In operation, the pulse oximeter monitor controls synchronous generations of a central PPG signal by the central PPG sensor and of a peripheral PPG signal by the peripheral PPG sensor, and also control a CPR pulse detection via the dual PPG probe including a detection of a presence of a spontaneous pulse of the central PPG signal and a detection of a presence of a spontaneous pulse of the peripheral PPG signal.