CPR Feedback via Arterial Venous Flow Waveform Comparison
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Solution Overview
Problem
Existing CPR systems lack effective methods to determine the real-time effectiveness of chest compressions, which can lead to suboptimal resuscitation efforts.
Innovation Solution
A system that uses sensors to measure blood flow data, processing this data to generate arterial and venous blood flow waveforms, and providing real-time feedback on the effectiveness of chest compressions based on peak comparisons of these waveforms.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If real-time blood flow monitoring is implemented during CPR, then the effectiveness of chest compressions can be assessed, but the device complexity increases
Solution Approach 1:
The patent uses photoplethysmographic sensors as intermediaries to indirectly measure blood flow characteristics during CPR. Instead of directly measuring complex hemodynamic parameters, the system uses optical sensors to detect changes in light absorption by blood, providing a simplified yet effective method to assess CPR effectiveness through arterial and venous blood flow waveforms
Solution Approach 2:
The patent replaces complex mechanical blood flow measurement systems with optical detection methods. By using photoplethysmography (light absorption by hemoglobin), the system substitutes mechanical sensors with optical sensors, reducing device complexity while maintaining measurement capability for assessing CPR effectiveness
2Measurement precision
If arterial and venous blood flow waveforms are analyzed separately, then the precision of CPR effectiveness measurement is improved, but the difficulty of detecting and measuring increases
Solution Approach 1:
The patent segments the blood flow measurement into separate arterial and venous waveform detections. By using multiple photoplethysmographic sensors positioned at different anatomical locations (e.g., finger for arterial, earlobe for venous), the system separately captures arterial and venous blood flow characteristics, enabling precise assessment of forward blood flow during CPR
Solution Approach 2:
The patent uses photoplethysmographic sensors as intermediaries to indirectly measure blood flow characteristics during CPR. Instead of directly measuring complex hemodynamic parameters, the system uses optical sensors to detect changes in light absorption by blood, providing a simplified yet effective method to assess CPR effectiveness through arterial and venous blood flow waveforms
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 system enables rescuers to adjust chest compression parameters in real-time, improving the effectiveness of CPR by ensuring optimal blood flow and tissue perfusion.
Implementation Method 1
The at least one sensor can include at least one of a photoplethysmographic sensor, an ultrasound sensor, or a blood flow sensor
Implementation Method 2
a 750 nm light-emitting diode (LED) for a venous target having a first absorbance is dominated by de-oxy hemoglobin, and a 850 nm LED for a 850 nm an arterial target having a second absorbance is dominated by oxy-hemoglobin
Implementation Method 3
The at least one sensor can include at least one of a photoplethysmographic sensor, an ultrasound sensor, or a blood flow sensor
Data Source
AI summary
A system for assisting with a chest compression treatment being administered to a patient. In one aspect, the system for assisting with chest compression treatment includes at least one sensor configured to measure blood flow data, one or more processors, in communication with the at least one sensor, and an output device configured to provide the output indication to the rescuer. The one or more processors are configured to perform operations including receiving the blood flow data from the at least one sensor, based on the blood flow data, generating arterial blood flow data and venous blood flow data, providing an estimation of chest compression effectiveness based on the arterial blood flow data and the venous blood flow data, the estimation being based on at least one peak comparison of arterial blood flow and venous blood flow, and generating an output indication of the estimation of chest compression effectiveness.