Wearable electro-cardio signal collection device based on fabric electrode

Abstract

The invention discloses a wearable electro-cardio signal collection device based on a fabric electrode. The device can carry out complete collection of electro-cardio signals of a human body aiming at the fabric electrode which is a novel flexible electrode. The device is characterized in that input impedance conversion of the fabric electrode could be achieved by an impedance conversion circuit, so the problem about high input impedance of the fabric electrode could be solved; common mode rejection and differential amplification are completed by a low-pass filtering circuit and a differential circuit; and finally, AD sampling and data set package transmission could be achieved. In comparison with a traditional electro-cardio collection circuit, the device disclosed by the invention is characterized in that the impedance conversion circuit is added at the fabric electrode part; power is supplied by a single power source; and an operational amplifier with a high signal to noise ratio and high input impedance is selected. In this way, the puzzle that signals are incomplete when the traditional electro-cardio collection circuits are used to extract the electro-cardio signals of the human body with application of the fabric electrode could be solved. The device is characterized by good performance, the small size and low power consumption. The device can be widely applied to wearable electro-cardio signal collection based on the fabric electrode; and comfort and convenience of use are enhanced.

Description

technical field [0001] The invention relates to the technical field of signal acquisition, in particular to a wearable ECG signal acquisition device based on fabric electrodes. Background technique [0002] The beating of the heart is pacing due to the electrical stimulation of the heart itself. This weak current generated by the electrical excitation of the heart can be transmitted to the surface of the body through human tissue and generate a potential difference of millivolts on the surface of the body. , usually this potential difference signal detected from the body surface is the ECG signal, which reflects the difference in the transmembrane potential of cardiomyocytes during depolarization and repolarization in each cardiac cycle. With the regular excitation, contraction and relaxation of the heart, these potential changes also show a certain regularity. The waveform recorded by these regular potential changes through amplification is called an electrocardiogram. [...

AI Technical Summary

Problems solved by technology

Due to the use of discrete components to achieve, it is inevitable to use a large number of integrated circuits, resistors and capacitors and other components, resulting in the disadvantages of large volume, high power consumption, and low flexibility in design. However, based on fabric electrodes In order to realize the wearable long-term continuous ECG signal acquisition technology, miniaturization and low power consumption design are required. The traditional acquisition circuit cannot meet the demand, and the design needs to be further improved.

[0006] The following problems often occur when traditional sticky wet electrodes are collected in daily ECG signals: First, the conductive paste applied between the electrodes and the skin maintains good contact for about 24 hours at most. The paste will dry out, causing the contact impedance between the electrode and the skin to change, reducing the sensitivity and signal-to-noise ratio of the signal; secondly, the conductive paste is in contact with the skin for a long time, and its compound is easy to penetrate into the skin, which is easy to cause some allergic reactions , such as itching, blistering, etc.; again, wet electrodes need to be exposed to the skin, and can only be worn after the skin surface is cleaned. The cold, sticky conductive paste is applied to the body and covered with a cold metal contact surface. This series of complicated operations and the discomfort brought by the sticky conductive paste may easily cause users to resist wearing electrodes. mood

[0010] Traditional ECG acquisition systems or devices are based on sticky disposable wet electrodes, which have low input impedance. The acquisition circuit usually uses a first-level conditioning amplifier circuit to meet the requirements. However, fabric electrodes have high input impedance. Form a high contact impedance, the traditional ECG conditioning circuit can no longer meet the requirements

[0011] A wearable ECG signal acquisition device based on fabric electrodes described in the present invention overcomes the ECG signal acquisition technology suitable for fabric electrodes, and solves the problem that traditional ECG signal acquisition circuits cannot collect when ECG fabric electrodes are used. The puzzle of getting to the complete ECG waveform

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