CPR Feedback Device Magnetic Interference Detection
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Solution Overview
Problem
Existing CPR feedback devices face challenges in providing accurate and precise feedback due to ambient magnetic interference, which can skew measurements and render them unreliable.
Innovation Solution
A medical device system that detects magnetic fields to measure CPR chest compression depth, includes a top and bottom device generating and utilizing a magnetic field, and employs a detector to sense and differentiate ambient interference, adjusting for interference above a threshold to ensure accurate feedback.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a CPR feedback device uses magnetic field detection to measure chest compression depth, then measurement capability is provided, but ambient magnetic interference skews measurements and reduces reliability
Solution Approach 1:
The patent introduces a reference sensor as an intermediary element that detects ambient magnetic interference separately from the measurement sensor. This reference sensor acts as a mediator that captures the interference component, allowing the system to subtract it from the total magnetic field signal and obtain accurate compression depth measurements free from environmental interference.
Solution Approach 2:
The patent extracts the harmful ambient magnetic interference component from the total magnetic field signal by using a dedicated reference sensor. By separating the interference detection function from the measurement function, the system can isolate and remove the interference portion, leaving only the genuine chest compression signal for accurate feedback.
2Measurement precision
If the device detects and filters ambient magnetic interference, then measurement accuracy improves, but device complexity increases
Solution Approach 1:
The patent segments the magnetic field detection function into two independent components: a measurement sensor for detecting total magnetic field (compression signal plus interference) and a reference sensor for detecting ambient interference only. This segmentation allows each sensor to be optimized for its specific function and simplifies the signal processing required to achieve accurate measurements.
Solution Approach 2:
The patent makes the magnetic field detection system multi-functional by using the same type of sensor (magnetic field sensor) for both measurement and reference purposes. This universality allows the system to achieve complex interference rejection capabilities while using relatively simple, off-the-shelf sensor components, thereby limiting the increase in device complexity.
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 provides reliable and accurate feedback on CPR compression depth by filtering out ambient magnetic interference, ensuring effective CPR administration and improving rescuer performance.
Implementation Method 1
A CPR feedback device that determines the depth of CPR chest compressions by detecting magnetic fields
Implementation Method 2
sensing whether, in a vicinity of the detector, there is interference superimposed on the detected magnetic fields, which interference is not associated with the CPR chest compressions
Data Source
AI summary
A medical device and/or a method are used by a rescuer who is caring for a patient. The depth of CPR chest compressions is determined, by detecting magnetic fields. An interference is sensed, which is not associated with the CPR chest compressions, but which is superimposed on the detected magnetic fields. Appropriate countermeasures may be taken, if the sensed interference is larger than a threshold.