ECG Electrode Circuit for Stable Contact State Detection
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Solution Overview
Problem
Existing electrocardiographic measurement devices face interruptions due to electrode attachment abnormalities and variations in electrode potential caused by body motion or dry skin, leading to inaccurate measurements.
Innovation Solution
A biological information measuring device with a configuration that includes three electrodes, utilizing non-inverting amplifiers and pull-up resistors to amplify and stabilize electrode potentials, allowing for accurate contact state detection and electrocardiographic waveform measurement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If electrode attachment abnormality detection is implemented, then measurement reliability is improved, but measurement interruptions increase due to false detections from body motion or dry skin
Solution Approach 1:
The patent changes the detection parameter from binary attachment/non-attachment to a continuous contact state assessment based on potential difference magnitude. By monitoring the absolute value of potential differences and comparing against thresholds, the system distinguishes between genuine attachment abnormalities and normal variations caused by body motion or skin conditions, thereby maintaining measurement continuity while ensuring reliability.
2Measurement precision
If pull-up resistors are added to each electrode, then contact state detection accuracy is improved, but device complexity increases
Solution Approach 1:
The patent makes each electrode circuit具有独立的功能，where pull-up resistors and non-inverting amplifiers serve dual purposes: they amplify the electrode potentials for accurate ECG measurement while simultaneously enabling independent contact state detection. This multi-functionality approach improves measurement precision without proportionally increasing overall device complexity, as the same circuit components serve multiple detection and measurement functions.
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 device achieves high-accuracy electrocardiographic waveform measurement by reducing noise and detecting electrode contact states effectively, ensuring stable measurements even with body motion or dry skin.
Implementation Method 1
a first non-inverting amplifier circuit including a first amplifier having a non-inverting input terminal to which a potential of the first electrode is input
Implementation Method 2
a first pull-up resistor connected between the first electrode and the first non-inverting amplifier circuit
Data Source
AI summary
A biological information measuring device including a first electrode, a second electrode, and a third electrode, and configured to measure biological information of a measurement target based on a potential difference between the first electrode and the second electrode with a potential of the third electrode used as a reference potential, the biological information measuring device including: a first non-inverting amplifier circuit; a first pull-up resistor; a first converter; a second non-inverting amplifier circuit; a second pull-up resistor; a second converter; a differential amplifier circuit configured to amplify a difference between a first amplified potential amplified and output by the first non-inverting amplifier circuit and a second amplified potential amplified and output by the second non-inverting amplifier circuit, and to output the biological information; and a processor configured to perform processing for measuring the biological information.