DC Electrode Respiration Sensing in Wearable Cardioverter Defibrillators
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Solution Overview
Problem
Existing healthcare devices for monitoring both heart rhythm and respiration are cumbersome and complicated due to the need for separate signal paths for electrocardiogram (ECG) and transthoracic impedance signals, which can be simplified by using direct current (DC) voltage to detect respiration rates without additional circuitry.
Innovation Solution
A wearable cardioverter defibrillator (WCD) uses DC signals injected into electrodes to measure electrode resistance, which is affected by respiration, allowing for the extraction of respiration rates from ECG signals without additional circuitry, thereby integrating respiration monitoring into heart rhythm analysis.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If separate devices are used to monitor heart rhythm and respiration, then monitoring capabilities are comprehensive, but device complexity increases and ease of operation deteriorates
Solution Approach 1:
The patent combines heart rhythm monitoring and respiration monitoring into a single integrated device. The WCD incorporates both ECG electrodes for cardiac monitoring and utilizes the same device platform to perform respiration rate determination through DC signal analysis, eliminating the need for separate monitoring devices and reducing overall system complexity
Solution Approach 2:
The WCD device performs multiple functions: it monitors heart rhythm through ECG signals and simultaneously determines respiration rate by analyzing DC voltage signals from the same electrodes. This multi-functional approach allows a single device to provide comprehensive health monitoring without requiring separate specialized devices
2Adaptability or versatility
If transthoracic impedance device is added to WCD for respiration monitoring, then respiration monitoring capability is added, but device complexity and circuitry requirements increase
Solution Approach 1:
The existing ECG electrodes and signal processing circuitry of the WCD are used for dual purposes: detecting cardiac electrical signals and measuring respiration rate. By injecting DC signals through the same electrodes and analyzing the resulting voltage changes, the device achieves respiration monitoring without requiring separate transthoracic impedance sensing circuitry
Solution Approach 2:
The WCD uses its own existing infrastructure (electrodes, signal processing capabilities, and computational resources) to perform respiration monitoring. The device leverages its inherent ECG monitoring capabilities and extends them to include respiration rate determination, eliminating the need for additional dedicated hardware components
3Adaptability or versatility
If additional circuitry is added for respiration monitoring, then respiration detection capability is improved, but device complexity and ease of manufacture worsen
Solution Approach 1:
The patent enables respiration detection using the same electrode system and basic signal processing circuitry already present in the WCD for ECG monitoring. By implementing software-based DC signal analysis algorithms, the device achieves respiration monitoring capability without requiring additional physical components, simplifying the manufacturing process
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 method enables simultaneous and efficient monitoring of heart rhythm and respiration without additional components, improving the accuracy of arrhythmia detection and providing timely interventions by considering both heart and respiratory conditions.
Implementation Method 1
A wearable cardioverter defibrillator (WCD) uses DC signals injected into electrodes to measure electrode resistance, which is affected by respiration
Data Source
AI summary
Technologies and implementations for determining a respiration rate of a person from heart rate monitoring signal is disclosed.