Combined CPR Device Using Circumferential Constriction and Anteroposterior Compression
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Solution Overview
Problem
Current cardiopulmonary resuscitation (CPR) methods fail to effectively combine anteroposterior compression and circumferential constriction, limiting hemodynamic enhancement and clinical efficacy, as they primarily rely on either cardiac or thoracic pump mechanisms without optimizing both.
Innovation Solution
A method that combines circumferential constriction and anteroposterior compression of the chest, with active decompression and airway obstruction during decompression phases, utilizing a powered piston mechanism and pneumatic systems to apply differential forces and pressures, optimizing hemodynamics through varying timing and force within the CPR cycle.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If circumferential constriction CPR is used, then intrathoracic pressure changes and blood flow are improved, but active decompression and airway impedance optimization cannot be achieved
Solution Approach 1:
The patent combines circumferential constriction CPR with active decompression and airway impedance threshold devices into a single integrated system. The device merges two previously separate approaches (circumferential constriction and active decompression) to simultaneously achieve both intrathoracic pressure optimization and venous return enhancement, resolving the contradiction between pressure improvement and decompression capability.
2Force
If anteroposterior compression is used, then the cardiac pump mechanism is engaged, but thoracic pump mechanism optimization is limited
Solution Approach 1:
The patent merges anteroposterior compression with circumferential constriction to engage both the cardiac pump mechanism and thoracic pump mechanism simultaneously. This combination allows the device to optimize both sternal compression force and intrathoracic pressure changes, resolving the contradiction between engaging one pump mechanism and optimizing the other.
3Force
If mechanical CPR devices are used, then compression force is improved, but clinical efficacy and return of spontaneous circulation remain insufficient
Solution Approach 1:
The patent combines multiple hemodynamic optimization techniques (circumferential constriction, active decompression, airway impedance threshold) into a single device to simultaneously improve compression force and enhance return of spontaneous circulation. This multi-mechanism approach addresses the contradiction between applying force and achieving reliable resuscitation outcomes.
Solution Approach 2:
The patent optimizes multiple parameters simultaneously including intrathoracic pressure changes, compression force, decompression timing, and airway impedance. By changing and coordinating these parameters, the device improves both the mechanical compression aspect and the physiological outcome of spontaneous circulation return, resolving the contradiction between force application and resuscitation reliability.
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
This combination enhances hemodynamic performance and clinical outcomes by engaging both cardiac and thoracic pump mechanisms, improving blood flow and return of spontaneous circulation, particularly in cardiac arrest scenarios.
Implementation Method 1
inflation of a circumferential pneumatic bladder
Implementation Method 2
anteroposterior compression of the mid-chest in the area of the sternum, either manually or mechanically with a piston like mechanism
Implementation Method 3
This is achieved by use of a suction cup device at the end of the piston
Implementation Method 4
Additional enhancement of negative intrathoracic pressure and venous return may be achieved by briefly obstructing the airway during the decompression release phase. Typically, this is achieved through utilization of a cracking valve mechanism called an impedance threshold device
Data Source
AI summary
The present invention is a method for improving hemodynamics and clinical outcome of patients suffering cardiac arrest and other low-flow states by combination of circumferential constriction and anteroposterior compression decompression of the chest cardiopulmonary resuscitation. Anteroposterior compression decompression may be provided by a piston mechanism attached to a gantry above the patient. Circumferential constriction may be achieved by inflation of pneumatic bladders or shortening of a band. The on-off sequence and relative force of circumferential constriction and anteroposterior compression decompression may be adjusted so as to improve efficacy.