A wearable multi-parameter measuring instrument

Abstract

The invention discloses a wearable multi-parameter measuring instrument, which includes a processor and a first-order high-frequency low-pass filter whose input end is connected to the human body, whose output end is electrically connected to the input end of an impedance converter; The output end of the device is electrically connected to the input end of the processor through a first-order anti-aliasing low-pass filter and an analog-to-digital converter; the processor is equipped with an oversampling unit and a digital filtering unit; the sampling unit is used for analog-to-digital conversion The output signal of the device is oversampled, and the sampled data is sent to the digital filter unit; the digital filter unit is used to digitally filter the sampled data and obtain the electrocardiogram signal; it also includes the first composite electrode and / or the second composite electrode; The first composite electrode measures ECG and body temperature; the second composite electrode measures ECG and heart sounds. The signal obtained by the invention is precise, small in size and low in power consumption; it can simultaneously monitor electrocardiogram and body temperature data, and simultaneously monitor electrocardiogram and heart sound data, with few user operation steps and low use cost.

Description

technical field [0001] The invention belongs to the technical field of medical devices, in particular to a wearable multi-parameter measuring instrument. Background technique [0002] Multi-parameter monitor is an instrument widely used in hospitals. In many occasions such as surgery, postoperative, ICU, ambulance, etc., it collects the physiological parameters of patients in real time, displays and alarms when the indicators exceed the standard. It can be said that the monitor is a monitor. instrument of life. In general, the commonly used monitor monitors six parameters including ECG, blood pressure, blood oxygen, respiration, body temperature and pulse. [0003] With the development of the times, wearable multi-parameter measuring instruments are the direction of future development. [0004] The ECG signal has the characteristics of weak signal, high impedance, and susceptible to interference. The strength of the interference signal is generally dozens of times the stre...

AI Technical Summary

Problems solved by technology

[0007] 1. Since the electrocardiogram signal needs low frequency components as low as 0.05Hz and the polarization voltage needs to be removed at the same time, a DC blocking high-pass filter 3 must be used. For the frequency of 0.05Hz, the RC must be very large, and the tiny leakage of capacitor C is particularly easy The back-end amplifier will be saturated hundreds of times, and the electrocardiograph will not be usable at this time.

[0008] 2. Due to errors in electronic parts, the effect of analog filters will be greatly reduced, especially for band-stop filters for power frequency interference. The accuracy of RC directly affects the position and width of the notch, which eventually leads to a decrease in the accuracy of data acquisition

[0010] 4. The precise analog circuit makes the product have high requirements for the use environment. For example, in the case of temperature and humidity changes and poor air quality, the insulation degree of the circuit board will be reduced, and the filter effect will also be reduced. Therefore, Traditional electrocardiograph circuit boards often adopt the method of spraying insulating varnish to resist the influence of the environment, resulting in complicated production process and decreased stability of product quality

[0011] 5. In general, digital devices are much more adaptable to interference than analog devices, and too many analog devices increase the probability of product performance degradation

[0014] First, it can only monitor ECG data, not body temperature data

If you need to monitor ECG data and body temperature data at the same time, you need to place ECG electrodes and body temperature sensors, which is time-consuming and labor-intensive, and is prone to wrong placement

[0015] Second, it can only monitor ECG data, not heart sound data

If you need to monitor ECG data and heart sound data at the same time, you need to place ECG electrodes and heart sound sensors, and the operation is time-consuming and laborious

[0016] Third, the one-piece design needs to be discarded as a whole after one use, and the cost of use is high

[0017] Fourth, the contact area between the conductive part and the skin is small, and the quality of the collected ECG data is low

Due to the forward voltage drop (Vf) of the diode, the signal must first be amplified to a level where Vf can be tolerated, even so, the Vf of the diode will greatly reduce the detection efficiency

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