ECG Patch with Floating High-Pass Filter Bias
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Solution Overview
Problem
Conventional ECG patches require a separate bias electrode for body biasing, which increases the size and complexity, and the contact area with the skin, making them less convenient for attachment and detachment.
Innovation Solution
An ECG patch design incorporating two electrodes and a floating high-pass filter that generates and applies a bias voltage directly through the electrodes, eliminating the need for a separate bias electrode and minimizing skin contact area.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a separate bias electrode is used for body biasing, then the bias voltage can be supplied to the patient's body, but the size and complexity of the ECG patch increases and the skin contact area increases
Solution Approach 1:
The patent combines the bias electrode function with the existing ECG electrodes by using the same electrodes to both detect ECG signals and supply bias voltage. The high-pass filter circuit is integrated into the electrode assembly, allowing the bias voltage to be supplied through the signal electrodes rather than requiring a separate bias electrode. This merging of functions reduces the number of components and simplifies the overall patch structure.
Solution Approach 2:
The ECG electrodes are designed to perform multiple functions: detecting ECG signals and simultaneously supplying bias voltage to the patient's body. The high-pass filter circuit enables the signal electrodes to serve dual purposes, acting as both sensing elements and bias voltage delivery pathways. This multi-functionality eliminates the need for dedicated bias electrodes and reduces skin contact requirements.
2Reliability
If a separate bias electrode is used for body biasing, then the bias voltage can be supplied to the patient's body, but the contact area with the skin increases making attachment and detachment less convenient
Solution Approach 1:
The patent merges the bias voltage supply function into the existing two ECG electrodes, eliminating the need for a separate bias electrode that would require additional skin contact. The high-pass filter circuit allows the signal electrodes to simultaneously provide bias voltage, reducing the number of attachment points needed and improving ease of application and removal.
3Reliability
If the high pass filter is integrated into the ECG patch, then the bias voltage can be generated and applied through the electrodes, but the circuit complexity increases
Solution Approach 1:
The high-pass filter circuit is designed to generate the bias voltage automatically from the incoming signal without requiring external bias voltage input. The circuit uses the ECG signal itself to create the necessary bias voltage through its high-pass filtering action, making the system self-sufficient and eliminating the need for additional bias voltage generation components.
Solution Approach 2:
The high-pass filter circuit changes the voltage parameters of the ECG signal by blocking DC components and passing AC components, thereby generating a time-varying bias voltage from the signal itself. This parameter transformation allows the circuit to produce the required bias voltage dynamically without additional power supply circuits or static bias voltage sources.
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 design reduces the size and complexity of the ECG patch, enhances convenience in attachment and detachment, and improves the form factor by minimizing the skin contact area while maintaining effective ECG signal processing and transmission.
Implementation Method 1
a high-pass filter configured to perform high-pass filtering on the first ECG signal to generate a first high-pass filtered signal, and to perform high-pass filtering on the second ECG signal to generate a second high-pass filtered signal
Implementation Method 2
These electrodes detect tiny electrical changes on the person's skin that arise from the heart depolarizing during each heartbeat
Data Source
AI summary
An electrocardiograph (ECG) patch including: a first electrode; a second electrode; a high pass filter configured to receive a bias voltage and provide the bias voltage to the first electrode and the second electrode; and a signal processing unit configured to generate the bias voltage and provide the bias voltage to the high pass filter.