Inflatable Limb Sleeves for CPR Blood Flow Redirection
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Solution Overview
Problem
Current cardiopulmonary resuscitation (CPR) methods have a low success rate due to limitations in perfusion of critical organs, with existing automated devices and pharmacological interventions like epinephrine causing unintended harm and inefficiencies in blood flow distribution.
Innovation Solution
Mechanical systems comprising inflatable sleeves placed on limbs to externally compress and redirect blood flow from limbs to the torso and head regions, using inflatable fluid chambers and a user interface to control pressure, ensuring continuous compression above systolic blood pressure during CPR.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If epinephrine and vasoconstrictors are used to enhance blood flow to central organs, then blood flow to critical organs is improved, but myocardial necrosis and aortic stiffness increase causing harm
Solution Approach 1:
The patent replaces pharmacological intervention (epinephrine injection) with a mechanical system (inflatable sleeves) to achieve peripheral vasoconstriction. The sleeves apply external compression to limbs to redirect blood flow to central organs, eliminating the harmful side effects of epinephrine while maintaining its hemodynamic benefits
Solution Approach 2:
The inflatable sleeves act as an intermediary mechanical device between the rescuer and the patient's circulatory system. Instead of introducing chemical substances (epinephrine) that cause harm, the sleeves provide a mechanical intermediary that achieves blood flow redistribution through controlled external compression
2Reliability
If manual CPR is performed, then blood flow to critical organs can be maintained, but rescuer knowledge, technique, and endurance limitations reduce effectiveness
Solution Approach 1:
The system incorporates automated features including pressure sensors that monitor compression levels, inflation/deflation cycles that occur automatically with each CPR compression, and a user interface that guides operation. This reduces the technical skill and physical endurance requirements for the rescuer while maintaining effective perfusion
Solution Approach 2:
The system uses pressure sensors to provide real-time feedback on compression pressure and blood flow effectiveness. This feedback loop allows the system to automatically adjust inflation pressure and timing to optimize perfusion while reducing the knowledge burden on the rescuer
3Stress or pressure
If peripheral vascular system is compressed to redirect blood to torso and head, then perfusion pressure to critical organs is enhanced, but blood flow distribution to limbs is reduced
Solution Approach 1:
The sleeves are inflated and deflated in synchronization with CPR compression cycles. During compression phases, the sleeves are inflated to redirect blood to central organs; during relaxation phases, they are deflated to allow peripheral blood flow restoration. This periodic action enhances central perfusion while minimizing overall energy loss
Solution Approach 2:
The sleeves are positioned and pre-inflated before CPR begins, establishing the hemodynamic redirection pattern in advance. This preliminary setup ensures immediate enhancement of perfusion pressure to critical organs from the start of resuscitation
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
Enhances perfusion pressure to critical organs, reduces the need for pharmacological interventions, and improves CPR outcomes by maintaining blood flow to vital regions, potentially lowering drug dosages and minimizing myocardial oxygen consumption.
Implementation Method 1
mechanical systems and methods that can serve to externally compress and/or collapse the peripheral vascular system to redirect blood to the torso and head regions
Implementation Method 2
at least one inflation source fluidly coupled to each of the inflatable fluid chambers of the sleeves and operable to inflate the fluid chambers to a desired compression pressure and maintain the desired compression pressure throughout CPR
Data Source
AI summary
Systems and methods to externally compress or collapse the peripheral vascular system of a patient during CPR to mechanically redirect blood to the torso and head regions to enhance the likelihood of successful CPR outcomes. A plurality of sleeves adapted for placement on a patient's limbs during CPR, each sleeve including at least one inflatable fluid chamber, and at least one inflation source fluidly coupled to each of the inflatable fluid chambers of the sleeves. The sleeve chambers can be inflated to a desired compression pressure and maintained at the desired compression pressure continuously throughout CPR to prevent or restrict blood flow in the limbs. The compression pressure may be sufficient to redirect substantial blood from the patient's limbs to the patient's torso and head regions and enhance hemodynamic wave reflection during CPR.