CN110693490A

CN110693490A - Portable wireless electrocardiograph

Info

Publication number: CN110693490A
Application number: CN201911030936.8A
Authority: CN
Inventors: 武荷艳; 齐玉杰
Original assignee: Zhengzhou Central Hospital
Current assignee: Zhengzhou Central Hospital
Priority date: 2019-10-28
Filing date: 2019-10-28
Publication date: 2020-01-17

Abstract

The invention relates to the technical field of electrocardiographs, in particular to a portable wireless electrocardiograph. It includes the electrocardiograph body and leads and allies oneself with the piece, lead the piece including disposable paster and wireless transmission chip, the top of disposable paster is provided with the magnet piece, the bottom of wireless transmission chip is seted up and is pegged graft complex magnet groove with the magnet piece, magnet piece and magnet groove magnetic adsorption. In this portable wireless electrocardiograph, each leads and sets up wireless sensor, accomplish that heart physiological signal record is wireless uploads, and every sensor sending information can be accepted to the electrocardiograph simultaneously, realizes electrocardiographic wireless transmission, and the wireless transmission chip passes through the direct absorption of magnet and leads the piece, can conveniently do the heart electrograph repeatedly, and magnet connection is simpler, and is convenient, and the electrocardiograph sets up critical value early warning system, simply knows the picture to the result, and the warning is sent out immediately in the abnormal report, reminds medical staff.

Description

Portable wireless electrocardiograph

Technical Field

The invention relates to the technical field of electrocardiographs, in particular to a portable wireless electrocardiograph.

Background

The electrocardiograph can automatically record the bioelectric signals generated by exciting cardiac muscle during heart activity, and is a medical electronic instrument commonly used for clinical diagnosis and scientific research. Wireless transmission can not be achieved by the conventional electrocardiograph, so that an electrocardiogram test has certain limitation, and meanwhile, the electrocardiograph can not identify information of a patient, so that careless mistakes can be caused in detection information.

Disclosure of Invention

The present invention is directed to a portable radio electrocardiograph, which solves the above problems.

In order to achieve the purpose, the invention provides a portable wireless electrocardiograph, which comprises an electrocardiograph body and a lead sheet, wherein the lead sheet comprises a disposable patch and a wireless transmission chip, a magnet block is arranged at the top of the disposable patch, a magnet groove matched with the magnet block in an inserted manner is formed in the bottom of the wireless transmission chip, and the magnet block and the magnet groove are magnetically adsorbed.

Preferably, the top surface of the electrocardiograph body is provided with an intelligent touch screen, and the electrocardiograph body is internally provided with an electrocardiosignal processing chip for analyzing electrocardiosignal information.

Preferably, the electrocardiograph body is associated with a hospital medical record system.

Preferably, an emergency value early warning system is arranged in the electrocardiograph body.

Compared with the prior art, the invention has the beneficial effects that:

1. in the portable wireless electrocardiograph, each lead is provided with the wireless sensor, the wireless uploading of the heart physiological signal record is completed, and meanwhile, the electrocardiograph can receive the information sent by each sensor to realize the wireless transmission of the electrocardiogram.

2. In this portable wireless electrocardiograph, the wireless transmission chip passes through the direct absorption of magnet and leads the connection piece, can conveniently do the heart electrograph repeatedly, and magnet connection is simpler, and is convenient.

Drawings

FIG. 1 is a schematic view of the overall structure of the present invention;

FIG. 2 is an exploded view of a lead patch structure of the present invention;

FIG. 3 is a diagram of a wireless transmission chip according to the present invention;

FIG. 4 is a schematic diagram of the operation of the amplification module of the present invention;

FIG. 5 is a schematic diagram of the operation of the bandpass filtering module of the present invention;

FIG. 6 is a schematic diagram of the operation of the power frequency notch module of the present invention;

FIG. 7 is a schematic diagram of the operation of the main amplifier circuit of the present invention;

fig. 8 is a schematic diagram of the operation of the wireless transmission module of the present invention.

The various reference numbers in the figures mean:

1. an electrocardiograph body; 11. a smart touch screen; 2. a conductive sheet; 21. disposable sticking; 22. a wireless transmission chip; 23. a magnet block; 24. a magnet slot.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", and the like, indicate orientations and positional relationships based on those shown in the drawings, and are used only for convenience of description and simplicity of description, and do not indicate or imply that the equipment or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be considered as limiting the present invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.

Referring to fig. 1-8, the present invention provides a technical solution:

the invention provides a portable wireless electrocardiograph, please refer to fig. 1-8, which comprises an electrocardiograph body 1 and a lead sheet 2, wherein the lead sheet 2 comprises a disposable patch 21 and a wireless transmission chip 22, a magnet block 23 is arranged at the top of the disposable patch 21, a magnet groove 24 which is in plug fit with the magnet block 23 is arranged at the bottom of the wireless transmission chip 22, and the magnet block 23 and the magnet groove 24 are magnetically adsorbed.

In this embodiment, the top surface of the electrocardiograph body 1 is provided with the intelligent touch screen 11, and the electrocardiograph body 1 is internally provided with an electrocardiosignal processing chip for analyzing electrocardiosignal information.

The electrocardiosignal processing chip comprises a preamplification module, a band-pass filtering module, a power frequency trap module, a main amplification module and a display module.

Further, the preamplifier module is required to have high input impedance, high common mode rejection ratio, high gain, high stability, low noise and low drift, and simultaneously, the characteristics of portability and power consumption and volume are considered, the preamplifier module in the embodiment selects a preamplifier module of AD620an.ad620an0z of the american analog devices company, the AD620AN is an instrument amplifier structure integrated with three operational amplifiers, a triode at the input end provides simple differential bipolar input for protecting the high precision of gain control, a p process is adopted to obtain lower input bias current, the collector current of the input triode is kept constant through feedback of the internal operational amplifier of the input stage, and the input voltage is added to an external gain control Rg resistor;

the band-pass filtering module adopts a second-order active filter, and the gain formula is as follows:

the transfer function of this circuit is derived as follows: according to the circuit, the current equation Σ I of the nodes C and B is listed as 0, respectively, and is obtained:

the formula above can be combined to obtain:

different types of filters are available by giving Y1 to Y4 different rc elements, and by giving Y1 ═ Y3 ═ 1/R and Y2 ═ Y4 ═ SC, the transfer function is:

the transfer function has two poles and no zero, and is a second-order low-pass filter, in which:

in the formula of omega₀For characteristic angular frequency, K is operational amplifier gain, Q is equivalent quality factor of the filter circuit, Q is too low, the filter hardly has a steep transition band, when K > 3, the coefficient s term in the mother becomes negative, the pole moves to the right half plane of the s plane, thus causing system instability, if the positions of R and C in the low-pass circuit are interchanged, an RC high-pass circuit can be obtained, that is, if Y1 is Y3 is SC, Y2 is Y4 is 1/R, a second-order active high-pass filter can be obtained, since the second-order high-pass filter and the second-order low-pass filter have symmetry in circuit structure, their transfer functions also have a dual relation, the transfer function of the high-pass filter can be obtained as follows:

when the low-pass filter circuit and the high-pass filter circuit are connected in series, a band-pass filter circuit can be formed, provided that the cut-off angle frequency of the low-pass filter circuit is larger than that of the high-pass filter circuit, and the two covered pass bands provide a band-pass response.

Although in the preamplifier circuit, the embodiment employs a low-noise integrated operational amplifier to suppress 50HZ power frequency interference, the 50HZ power frequency interference cannot be completely eliminated in actual measurement in different environments, and therefore, a power frequency notch module is also required to eliminate the power frequency interference, which is generally suppressed by common band-stop filtering, and a band-stop filter is also called a notch filter, and when the 50HZ interference is very serious, a notch filter using 50HZ as a center frequency can be used to filter the 50HZ frequency component.

The amplitude of the electrocardiosignal is known as 10uV-5mV, the input level of the selected A/D converter is required to be 0-3.3V, so that the electrocardiosignal needs to be efficiently amplified by about 600-80 times by gain, the preamplification module theoretically amplifies by 10 times, and at the moment, the main amplification module amplifies by about 80 times, and the main amplification circuit consists of R15, R16 and an operational amplifier, and the embodiment adopts a same-proportion amplification circuit which intervenes in a R16 variable resistor and can adjust the optimal gain output.

Further, the wireless transmission chip 22 is composed of an STC12C5a60S2 single chip microcomputer and an nRF24L01 wireless transceiver chip, the STC12C5a60S2 single chip microcomputer and an nRF24L01 wireless transceiver chip are composed of a transmitting end and a receiving end, the transmitting end performs a/D conversion and wireless transmission through the single chip microcomputer, the receiving end receives data through an nRF24L01 and then transmits the data to the STC12C5a60S2 single chip microcomputer for display and analysis, all configuration work of the wireless module nRF24L01 is completed through SPI, 30B configuration words are shared, an enhanced shockburst tm transceiver mode is generally adopted, programming of the system is simpler and higher in stability, the enhanced shockburst configuration word enables an nRF24L01 to process a radio frequency protocol, after configuration is completed, in the nRF24L01 work process, the content in the lowest byte can be changed to realize switching between a receiving mode and an nRF24L01 mode, and wireless transceiver chip 366 or point-to point modulation is adopted for wireless communication, FSK 361 or point-to point modulation, the wireless communication speed can reach 2Mb/S, the nRF24L01 can be connected with the microprocessor through the SPI interface, the setting and data receiving and sending work can be completed through the interface, the SPI controller is integrated into the STC12C5A60S2 single chip microcomputer, the data can be output only when the local address is received through software setting, and the programming is very convenient.

Further, electrocardiograph body 1 is associated with hospital case history system, hospital case history system adopts the J2EE mode to realize, mainly adopt servlet technique to realize producing alternately with patient's mobile terminal, adopt J2EE to have the platform independence, easy transplantation, high performance, characteristics such as easy deployment, in this system realization, only need install a small-size machine as server hardware at the computer lab, apply for a domain name simultaneously, can realize information sharing, the user only needs to interact with the server just can realize logging in hospital case history system, be convenient for draw electrocardiogram medical advice information automatically, can show incomplete patient, sweep patient's wrist strap and confirm the automatic generation information, automatic upload after the electrocardiogram is accomplished.

Specifically, the emergency value early warning system is arranged in the electrocardiograph body 1, the result can be simply recognized, an abnormal report immediately gives a warning to remind medical staff, the early warning system adopts a buzzer, the buzzer can be divided into an active buzzer and a passive buzzer, and the active buzzer is internally provided with an oscillation source so that the alarm can be called as long as one is electrified. The passive buzzer is not provided with an oscillation source, so that the passive buzzer cannot sound when driven by a direct current signal and must be driven by a square wave signal of 2KHz-5 Hz.

The foregoing shows and describes the general principles, essential features, and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, and the preferred embodiments of the present invention are described in the above embodiments and the description, and are not intended to limit the present invention. The scope of the invention is defined by the appended claims and equivalents thereof.

Claims

1. A portable wireless electrocardiograph comprises an electrocardiograph body (1) and a lead sheet (2), and is characterized in that: lead and lead piece (2) including disposable paster (21) and wireless transmission chip (22), the top of disposable paster (21) is provided with magnet piece (23), the complex magnet groove (24) are pegged graft with magnet piece (23) are seted up to the bottom of wireless transmission chip (22), magnet piece (23) and magnet groove (24) magnetic adsorption.

2. The portable radio-electrocardiograph according to claim 1, wherein: the electrocardiograph is characterized in that an intelligent touch screen (11) is arranged on the top surface of the electrocardiograph body (1), and an electrocardiosignal processing chip for analyzing electrocardiosignal information is arranged in the electrocardiograph body (1).

3. The portable radio-electrocardiograph according to claim 1, wherein: the electrocardiograph body (1) is associated with a hospital medical record system.

4. The portable radio-electrocardiograph according to claim 1, wherein: an emergency value early warning system is arranged inside the electrocardiograph body (1).