CPR Feedback Sensor Dual-Mechanism Reference Design
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Solution Overview
Problem
Existing CPR feedback devices struggle to accurately measure chest compression depth on flexible surfaces, which hinders effective cardiopulmonary resuscitation due to variations in surface yield, leading to potential delays in defibrillation and reduced survival rates during cardiac arrests like Ventricular Fibrillation.
Innovation Solution
A medical device system comprising a top mechanism placed on the patient's chest and a bottom mechanism positioned under the patient, which cooperate to generate a net compression depth measurement by comparing the displacement of both mechanisms during CPR, providing accurate feedback to rescuers and correcting errors in treatment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single sensor is used to measure CPR compression depth, then the device structure is simple, but the measurement precision deteriorates on flexible surfaces due to surface yield variations
Solution Approach 1:
The measurement system is divided into two separate sensors: a top sensor placed on the patient's chest and a bottom sensor placed on the surface beneath the patient. Each sensor independently measures displacement, and their readings are combined to calculate net compression depth. This segmentation allows the system to compensate for flexible surface yield by comparing the movement of the chest relative to the surface, thereby improving measurement precision without significantly increasing overall device complexity.
Solution Approach 2:
The bottom sensor acts as an intermediary reference point that measures the movement of the flexible surface itself. By using this intermediate measurement, the system can distinguish between actual chest compression and surface deformation, enabling accurate compression depth measurement even on flexible surfaces that would otherwise compromise measurement precision.
2Reliability
If CPR feedback measurement is implemented, then the effectiveness of CPR is improved, but the device complexity increases due to multiple mechanisms
Solution Approach 1:
The measurement system is divided into two separate sensors: a top sensor placed on the patient's chest and a bottom sensor placed on the surface beneath the patient. Each sensor independently measures displacement, and their readings are combined to calculate net compression depth. This segmentation allows the system to compensate for flexible surface yield by comparing the movement of the chest relative to the surface, thereby improving measurement precision without significantly increasing overall device complexity.
Solution Approach 2:
The system uses the existing flexible surface itself as part of the measurement reference frame. By placing a sensor on the surface and using its movement readings as a reference, the system turns the previously problematic flexible surface into a useful component of the measurement system, reducing the need for additional complex rigid support structures.
3Reliability
If accurate compression depth measurement is achieved on flexible surfaces, then the survival rate during cardiac arrest is improved, but the device complexity increases due to dual mechanism cooperation
Solution Approach 1:
The measurement system is divided into two separate sensors: a top sensor placed on the patient's chest and a bottom sensor placed on the surface beneath the patient. Each sensor independently measures displacement, and their readings are combined to calculate net compression depth. This segmentation allows the system to compensate for flexible surface yield by comparing the movement of the chest relative to the surface, thereby improving measurement precision without significantly increasing overall device complexity.
Solution Approach 2:
The system changes the measurement parameter from absolute displacement (single sensor) to relative displacement (difference between two sensors). By measuring the difference in movement between the top sensor on the chest and the bottom sensor on the surface, the system obtains net compression depth that is independent of surface flexibility, improving reliability without requiring complex additional hardware.
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 enables precise measurement of CPR compression depth on flexible surfaces, enhancing the effectiveness of CPR and potentially increasing survival rates by providing immediate and accurate feedback to rescuers, even in emergency situations where defibrillation is delayed.
Implementation Method 1
the top mechanism and the bottom mechanism cooperate to generate a value for a net depth of the compressions of the patient chest with reference to each other
Data Source
AI summary
Embodiments of the present concept are directed to medical devices for use by a rescuer who is caring for a patient and includes a bottom device for use with a top device to measure the depth of Cardio Pulmonary Resuscitation (CPR) chest compressions delivered to the chest of a patient. The top device is intended for placement on the chest of the patient and has a top mechanism that is moveable up and down as the chest compressions are delivered to the patient. The bottom device includes a generally elongate member having a handle at one end and a bottom mechanism near the opposite end. The elongate member is structured to be placed under the patient during delivery of CPR. The top mechanism and the bottom mechanism cooperate to generate a value for a net depth of the compressions of the patient chest with reference to each other.