Electrode Contact Quality Evaluation Circuit for ECT Systems
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Solution Overview
Problem
Existing electro-convulsive therapy (ECT) and related devices lack a built-in capability to evaluate the quality of electrode contact with the patient's skin, leading to potential poor signal quality and increased susceptibility to interference due to inadequate skin preparation and electrode conditions.
Innovation Solution
Integration of an electrode contact quality evaluation circuit within the ECT system to measure and report the contact impedance of each electrode, using AC impedance measurements at a test frequency of approximately 30 Hz, allowing for real-time assessment and notification of clinician for electrode replacement or reapplication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If visual or physical inspection of applied electrodes is used to assess contact quality, then the inspection process is simple and quick, but the determination of actual electrical connection quality is inadequate and unreliable
Solution Approach 1:
The patent replaces manual visual/physical inspection with an automated electrical impedance measurement system. The ECT system automatically measures contact impedance through electrodes during system initialization, substituting mechanical inspection methods with electrical measurement to objectively assess contact quality without requiring manual evaluation of electrode appearance or placement.
2Device complexity
If electrode contact quality is not evaluated, then the device operation is straightforward, but signal quality deteriorates and susceptibility to interference increases
Solution Approach 1:
The patent implements preliminary evaluation of electrode contact quality through impedance measurement during system initialization, before actual ECT treatment begins. This preliminary assessment allows the system to detect poor contact conditions in advance, alert operators to reposition or replace electrodes, and ensure reliable signal quality before treatment commences, preventing interference issues during the actual procedure.
3Reliability
If skin preparation steps are performed to improve electrode contact, then contact quality may be improved, but the preparation process becomes more time-consuming and complex
Solution Approach 1:
The patent implements feedback through automated impedance measurement that objectively assesses electrode contact quality after application. This feedback mechanism provides quantitative data about contact quality, allowing operators to determine whether additional skin preparation is necessary or if the current contact is sufficient, thereby avoiding unnecessary preparation steps and optimizing the balance between contact quality and preparation time.
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
Enhances the quality of electrical signals by ensuring optimal electrode contact, reducing noise and artifacts, and preventing device malfunction by providing integrated and convenient measurement of electrode contact quality within the ECT system.
Implementation Method 1
using AC impedance measurements at a test frequency of approximately 30 Hz
Data Source
AI summary
A patient monitoring system within an Electroconvulsive Therapy (ECT) device includes a patient monitoring channel including a first electrode and a second electrode, with each electrode coupled to a respective lead. The monitoring system also includes an Alternating Current source structured to inject a test current to the first electrode lead or the second electrode lead and a differential amplifier structured to measure differences between signals received from the first electrode lead and the second electrode lead. Related methods include evaluating a quality of an electrode contact with a skin surface by injecting a lead of the electrode and one input of a differential amplifier with a known electrical current, comparing a difference between an electrical signal received from the lead of the injected electrode as well as from a lead of a passive signal electrode, and evaluating the compared difference.