Defibrillator Electrode Segmentation for ECG Artifact Reduction
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Solution Overview
Problem
Existing external defibrillators face challenges in minimizing electrical interference between high-level defibrillator charges and low-level ECG monitoring signals, particularly due to ECG artifacts caused by chest compressions, patient motion, and electrostatically charged rescuers, which can adversely affect rhythm assessment during cardiac resuscitation.
Innovation Solution
The development of an electrode assembly with a first combination circuit that includes a monitoring segment and a therapy segment, where the therapy segment is electrically insulated from the monitoring segment, and a capacitor is used to couple the therapy segment to the defibrillator, allowing for a single communication channel for both ECG signal transmission and charge delivery, thereby reducing electrical interference and ECG artifacts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single communication channel is used for both ECG signal transmission and charge delivery, then device complexity is reduced, but electrical interference and ECG artifacts increase
Solution Approach 1:
The electrode is divided into a monitoring segment and a therapy segment that are electrically insulated from each other. The monitoring segment receives ECG signals while the therapy segment delivers defibrillator charges. This segmentation allows both functions to coexist in a single electrode structure without electrical interference, resolving the contradiction between device simplicity and signal quality.
Solution Approach 2:
A capacitor is introduced as an intermediary component between the single communication channel and the therapy segment. The capacitor couples the therapy segment to the defibrillator while blocking high-frequency noise and electrical interference from affecting the ECG monitoring signals, enabling clean signal transmission through a shared channel.
2Measurement precision
If electrical insulation between monitoring and therapy segments is implemented, then ECG signal quality improves, but electrode manufacturing complexity increases
Solution Approach 1:
The single electrode structure serves multiple functions: it provides both ECG monitoring and defibrillator charge delivery through its segmented design. The monitoring segment and therapy segment work together within one electrode assembly, reducing the need for separate components while maintaining signal quality through electrical insulation.
3Object-affected harmful factors
If a capacitor is used to couple the therapy segment, then electrical interference is reduced, but component count and assembly complexity increase
Solution Approach 1:
The capacitor coupling is integrated into the single communication channel architecture, merging the charge delivery function with the signal transmission path. This consolidation allows the capacitor to serve dual purposes: coupling the therapy segment for charge delivery while simultaneously filtering electrical interference from the ECG monitoring signals.
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 solution effectively reduces electrical interference and ECG artifacts, enabling more accurate monitoring and delivery of charges during defibrillation, improving the chances of successful resuscitation by maintaining clear ECG signals and ensuring effective impedance measurement.
Implementation Method 1
The coupling to the therapy node includes a capacitor
Data Source
AI summary
An electrode for use with an external defibrillator for a patient includes a first combination circuit including a circuit node electrically coupled to an adapter for coupling to the defibrillator. The circuit node is further coupled to a monitoring node defined by a monitoring segment of a first pad of the electrode and to a therapy node defined by a therapy segment of the first pad of the electrode. The therapy segment is electrically insulated from the monitoring segment. The first combination circuit further includes a capacitor coupled between the circuit node and the therapy node. The electrode of this disclosure hence provides additional solutions for reducing ECG artifact during the operation of the electrode.