Active Chest Compression System with Real-Time Compliance Feedback
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Solution Overview
Problem
Current cardiopulmonary resuscitation (CPR) methods face challenges in consistently applying optimal compression and decompression forces to the chest, as each patient's chest compliance varies significantly, leading to inefficiencies in blood circulation and potential injury from improper force application.
Innovation Solution
A mechanical chest compression system that includes a force sensor and a processor-controlled actuation arm, which estimates the chest compliance relationship to adjust the compression and decompression forces based on real-time feedback, ensuring effective CPR while minimizing the risk of injury.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If traditional manual chest compressions are performed by rescuers, then CPR can be provided to restore blood circulation, but the compression force and depth vary significantly between patients due to differences in chest compliance, leading to inconsistent CPR effectiveness and potential injury
Solution Approach 1:
The system employs force sensors to measure the actual compression force applied to the patient's chest in real-time. The processor receives these force signals and uses them to estimate chest compliance, which then feeds back to adjust the compression parameters dynamically, ensuring optimal and safe compression for each patient's specific anatomy
Solution Approach 2:
The mechanical chest compression system transitions from static, fixed-depth compressions to dynamic, adaptive compressions. The contact portion's position and applied force are continuously adjusted based on real-time feedback from force sensors and processor calculations, allowing the system to adapt to each patient's unique chest compliance characteristics
2Productivity
If higher compression forces are applied to ensure adequate blood flow, then CPR effectiveness improves, but the risk of injury to the patient's chest increases
Solution Approach 1:
Before initiating full CPR compressions, the system performs a preliminary assessment by applying small test forces and measuring the resulting chest displacement. The processor uses these measurements to estimate chest compliance and calculate the optimal compression force that will achieve adequate blood flow without causing injury
Solution Approach 2:
The system dynamically changes compression parameters including force magnitude, compression depth, and decompression depth based on the estimated chest compliance. This allows the system to optimize blood circulation efficiency while staying within safe force limits for each patient's specific anatomy
3Reliability
If mechanical chest compression systems are used to provide consistent compression, then CPR effectiveness improves, but the device complexity increases due to the need for force sensors, processors, and active decompression mechanisms
Solution Approach 1:
The mechanical chest compression system integrates multiple functions into a single device: it provides both compression and active decompression, incorporates force sensing capabilities, performs real-time compliance assessment, and automatically adjusts compression parameters. This multi-functionality reduces the need for separate devices and simplifies the overall resuscitation setup
4Productivity
If active decompression is implemented to enhance venous return, then blood circulation improves, but the device complexity and control requirements increase
Solution Approach 1:
The system implements continuous active decompression between compression cycles rather than passive release. The contact portion actively lifts the chest wall upward beyond the neutral position, maintaining continuous useful action that enhances venous return throughout the entire CPR cycle, improving blood circulation efficiency
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 ensures adequate blood circulation by applying tailored forces to each patient's chest, reducing the risk of injury and improving CPR effectiveness by adapting to individual chest compliance changes during resuscitation.
Implementation Method 1
a force sensor configured to generate a force signal during compression and decompression of the anterior surface of the patient
Implementation Method 2
The contact portion is movable relative to the base to provide compression and decompression to the anterior surface of the patient
Implementation Method 3
The rescuer then raises their hands upwards and releases them from the patient's sternal area, and the chest is allowed to expand by its natural elasticity
Data Source
AI summary
A mechanical chest compression system for performing cardiopulmonary resuscitation includes a resuscitation device and a controller operatively coupled to the resuscitation device. The resuscitation device includes a base, a contact portion configured to be in a superposed relation with an anterior surface of a patient when the patient is disposed on the base, and a force sensor configured to generate a force signal during compression and decompression of the anterior surface of the patient. In particular, the contact portion is movable relative to the base to provide compression and decompression to the anterior surface of the patient. The controller includes a processor configured to receive the force signal generated by the force sensor; estimate chest compliance relationship using the force signal; and generate instructions using the chest compliance relationship to drive the contact portion to provide compression and decompression to the anterior surface of the patient.