Automated CPR Chest Following Algorithm
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Solution Overview
Problem
Existing automated CPR devices face issues such as trauma, long set-up times, low stability, and insufficient force application, as well as limitations in chest recoil and ventilation due to fixed compression actuator positions, which compromise the effectiveness of chest compressions and ventilations.
Innovation Solution
A method and device for automated CPR that controls the position and force of a compression element during cycles, allowing for variable compression depths and counterforces to maintain contact with the chest, enabling optimal compressions and ventilation by adjusting the motor power and limiting depth deviations, and enabling/disabling position and force control at specific times.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the compression actuator is fixed at a zero position between chest compressions, then the device structure is simple, but a gap arises between the actuator and the thorax due to chest molding, compromising compression quality
Solution Approach 1:
The compression actuator transitions from a fixed position system to a dynamic position control system. The control element continuously adjusts the actuator position based on detected chest position, eliminating gaps caused by molding while maintaining simple device structure.
Solution Approach 2:
A sensor detects the position of the chest during CPR, and the control element uses this feedback to adjust the compression actuator position accordingly. This closed-loop feedback ensures continuous contact between the actuator and thorax despite chest molding.
2Ease of operation
If the compression actuator is fixed at its zero position, then the device operation is simple, but the thorax excursion during ventilation is limited, compromising ventilation effectiveness
Solution Approach 1:
The actuator position control system dynamically adjusts the actuator position in response to chest movement during ventilation. The sensor detects chest excursion and the control element modifies actuator position accordingly, allowing full chest movement during ventilation while maintaining simple operation.
Solution Approach 2:
The sensor provides feedback on chest position during ventilation, enabling the control element to adjust the actuator position to accommodate thorax excursion. This ensures ventilation effectiveness is not compromised while keeping the system easy to operate.
3Force
If large compression forces are applied continuously, then high-quality chest compressions are achieved, but the chest molding effect increases, causing the recoil point to drift
Solution Approach 1:
The sensor continuously monitors chest position and provides feedback to the control element. The control element adjusts compression forces in response to detected position changes, maintaining stable compression depth despite molding effects and preventing recoil point drift.
Solution Approach 2:
The control element dynamically changes compression force parameters based on real-time chest position detection. This allows the system to maintain optimal compression depth while adapting to changing chest conditions due to molding.
Data Source
AI summary
A method for automated CPR includes controlling a position of a compression element during movement of the compression element from an initial starting position (P0) of a first compression cycle to a first compression position (P1) corresponding to a first compression depth and back to a rest position of the compression element. After, the rest position has been reached, the method includes controlling a force exerted on the compression element, to ensure that the compression element stays in contact or re-contacts with the chest while allowing the chest to move upward due to ventilation, prior to the start of a second compression cycle.