Positive Pressure Pulse CPR Device Synchronization
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Solution Overview
Problem
Current automated CPR devices face challenges in delivering consistent high-quality chest compressions and ventilation, particularly in non-stable patient positions, and are cumbersome when used with mechanical ventilators, leading to inefficiencies and potential airflow obstruction.
Innovation Solution
A device that generates air pressure pulses to increase intrathoracic pressure, simulating heart compressions by inflating the lungs, allowing for simultaneous CPR and ventilation with adjustable settings based on vital signs, using a single interface that can operate in various positions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Extent of automation
If a pre-determined fixed ventilation procedure is used, then the ventilation device can operate autonomously, but the rescuer cannot synchronize chest compressions with ventilation cycles, leading to counteracting pressures and prohibited airflow into the lung
Solution Approach 1:
The control unit detects chest compression signals and uses this feedback to dynamically adjust the ventilation timing and pressure delivery, enabling synchronization between manual chest compressions and mechanical ventilation without requiring the rescuer to manually coordinate the two actions
Solution Approach 2:
The ventilation system transitions from a fixed pre-determined procedure to a dynamic adaptive system that automatically adjusts ventilation parameters based on real-time detection of chest compression events, allowing the system to respond flexibly to varying compression rates and timings
2Productivity
If chest compressions are applied asynchronously with ventilation cycles, then the rescuer can maintain continuous compressions, but positive pressure during compression counteracts ventilation pressure, prohibiting airflow into the lung
Solution Approach 1:
The system detects chest compression events in real-time and uses this information to timing ventilation delivery, ensuring that positive pressure ventilation is applied during the relaxation phase between compressions when intrathoracic pressure is lower, thereby avoiding pressure counteraction and enabling effective airflow
Solution Approach 2:
The control unit anticipates the timing of chest compressions by detecting compression signals and pre-coordinates ventilation delivery to occur at the optimal moment during the compression cycle, preventing pressure counteraction before it occurs
3Quantity of substance
If the ventilator cannot provide tidal airflow volume higher than dead space, then the device can operate with limited capacity, but CO2 enriched air cannot be exchanged by oxygen-rich air
Solution Approach 1:
The system adjusts ventilation parameters including tidal volume, respiratory rate, and pressure delivery timing to ensure that adequate oxygen-rich air reaches the alveoli for gas exchange, overcoming the limitation of anatomical dead space by optimizing the volume and timing of delivered breaths
4Reliability
If separate devices are used for chest compressions and ventilation, then each function can be optimized independently, but the device becomes cumbersome and difficult to use in hard to reach locations
Solution Approach 1:
The invention combines the chest compression device and mechanical ventilator into a single integrated apparatus, where the control unit coordinates both compression and ventilation functions, reducing the number of separate devices needed while maintaining the ability to optimize each function independently through software control
Solution Approach 2:
The device is designed with multi-functionality, serving as both a chest compression device and a mechanical ventilator through a single patient interface and unified control system, enabling it to perform multiple CPR functions that previously required separate devices
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 efficient and synchronized delivery of CPR and ventilation, reducing the need for separate devices and improving airflow exchange, thus enhancing cardiac circulation and oxygenation during cardiac arrest.
Implementation Method 1
the air pressure generator generates a first output comprising a first plurality of positive pressure pulses for temporally increasing the subject's intrathoracic pressure to induce compressions of the heart of the subject
Implementation Method 2
generates a first plurality of positive pressure pulses for temporally increasing the subject's intrathoracic pressure to induce compressions of the heart of the subject by increasing the volume of the subject's lungs
Implementation Method 3
the air pressure generator generates a second output comprising a second plurality of positive pressure pulses for providing an assured airflow to the lungs of the subject
Data Source
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AI summary
A cardiopulmonary resuscitation, CPR, device (100, 200, 400) for delivering intrathoracic pressure pulses to a subject (290), the device comprising an air pressure generator (110, 310, 410) for delivering air to the airways of the subject (290), wherein the air pressure generator (110, 310, 410) is configured to: operate a first mode, wherein in the first mode the air pressure generator (110, 310, 410) generates a first output (412, 770a, 770b) comprising a first plurality of positive pressure pulses (771) for temporally increasing the subject's intrathoracic pressure to induce compressions of the heart of the subject (290) by increasing the volume of the subject's lungs; operate a second mode, wherein in the second mode the air pressure generator (110, 310, 410) generates a second output (414, 880) comprising a second plurality of positive pressure pulses for providing an assured airflow to the lungs of the subject (290); and deliver a resulting output (425, 986, 1086) to the airways of the subject (290), the resulting output being the superposition of the first output (412, 770a, 770b) and of the second output (414, 880); wherein said first plurality of positive pressure pulses (771) have an amplitude greater than 30 mbar and a frequency in a range of 40-240 beats per minute; and wherein said second plurality of positive pressure pulses have an amplitude smaller than 30 mbar and a frequency in a range of 3 to 20 cycles per minute.