CN2437293Y - Electrocardial signal acquisition device - Google Patents

Abstract

The utility model discloses an electrocardiosignal collector, which is composed of an ECG lead electrode, an ECG analog signal regulating circuit, an A/D converting circuit, a single chip computer circuit, an RS232 communication interface and a Bluetooth wireless communication module; electrocardiosignals detected by the ECG lead electrode are processed by the ECG analog signal regulating circuit and then converted into digital signals by the A/D converting circuit, and the digital signals are input into a single chip computer by a serial bus; the electrocardiosignals which are digitized are conducted and calculated in the single chip computer, the electrocardiosignals which are in serial format are transmitted into the Bluetooth wireless communication module by the RS232 communication interface so as to be emitted and received by an ECG monitoring system workstation or an analysis system of an ECG recorder so as to be analyzed and processed or used. The utility model can conduct real-time monitoring of a patient, and the electrocardiosignals are not required to be transmitted to a processing display system by a cable.

Description

The ecg signal acquiring device

This utility model relates to a kind of electrocardio armarium technology, especially relates to a kind of 12 lead ecg signal acquiring device that can be used for equipment such as remote electrocardiogram monitor system, hospital's electrocardiogram monitor system.

Cardiac monitoring is one of therapy of often using in clinical, not only be applied in the heart class disease as CCN, the cardiac rehabilitation monitoring, the diagnosis monitoring of early stage cardiac disease etc., also widely apply in Intensive Care Therapy, postoperative care, aspects such as fetal monitoring, present raising and science and technology development along with people's living standard, cardiac monitoring has institute's internal electronic monitoring of hospital to develop into institute's external electronic monitoring gradually, open-air monitoring and domestic monitoring, particularly in the application of institute's external electronic monitoring, convenient, real-time monitoring is the development trend of cardiac monitoring, traditional monitoring method and technology have two main application directions: the one, and ambulatory electrocardiogram, the Holter Monitor of current use is called HOLTER, it is a carry-on ECG Acquisition Device, can be by tape or more advanced 24 hours ambulatory electrocardiogram of FLASH memorizer record, after incident takes place, monitor or recording medium are taken back the playback analysis that hospital carries out historical data, the 2nd, bedside monitoring, usually the Intensive Care Therapy of hospital and CCN belong to this class and (do not relate to the pace-making monitoring here, the operation monitoring), gather electrocardiosignal by the cable transmission of leading to the signal processing display system, but the defective of these electrocardiogram monitor is: 1, owing to can not monitor in real time, when the patient falls ill in the cardiac monitoring process and can not be handled timely to the patient; 2, owing to the reason of memory span, the nothing compression electrocardiogram that the 1-3 that ambulatory electrocardiogram can only write down 24 hours leads, if the electrocardiogram of record 12 lead can only adopt optionally event-triggered record, in the dynamic electrocardiogram recording box because the volume problem of power supply particularly, the accurate extraction that is used for the anomalous ecg incident of trigger recording is very limited, particularly when being had greatly changed, just may note a large amount of garbage signals by the moving situation of guardianship, when needs write down, might be because exhausting of record space and can't record; 3, in the bedside monitoring, because the existence of leading cable, the object of being guarded can not be free movable in the process of accepting monitoring, even the so necessary physiological activity of defecation also will be by other people help.

The purpose of this utility model is to provide a kind of and can monitors in real time the patient, also need not the cable transmission electrocardiosignal to the 12 lead ecg signal acquiring device of handling display system.

For achieving the above object, this utility model is by the cardiac diagnosis lead electrode, the ECG simulator signal conditioning circuit, analog to digital conversion circuit, single chip circuit, RS232 communication interface and blue tooth wireless communication module constitute, the electrocardiosignal of cardiac diagnosis lead electrode detection is carried out signal processing by cardiac diagnosis lead cable transmission to ECG simulator signal amplification circuit, electrocardiosignal is adjusted to the signal potential that keeps relative and is concerned after analog to digital conversion circuit converts digital signal to, enter single-chip microcomputer by analog-to-digital digital signal through universal serial bus, in single-chip microcomputer, digitized electrocardiosignal is carried out digital filtering and the computing of leading, by the RS232 communication interface cardiac diagnosis lead signal of serial form is sent into the blue tooth wireless communication module, modulate the laggard radio frequency integrated circuit of going into through baseband circuit in the blue tooth wireless communication module, through the RF circuit, the duplex allotter is launched for signal records such as electrocardiogram monitor system work station or electro-cardiographs, analytical system receives the post analysis processing or uses.

ECG simulator signal conditioning circuit described in the utility model is made up of nine identical ECG simulator signal condition passages and right lower limb RL drive circuit, and each passage is made of low pass circuit, buffer amplifier circuit, high-pass filtering circuit, main amplifying circuit; Resistance R 1, resistance R 2, capacitor C 1 and amplifier A1 constitute low-pass network, one end of resistance R 1 is the input of passage, the outfan of amplifier A1 inserts the in-phase input end of the amplifier A2 in the buffer amplifier circuit, the outfan of amplifier A2 inserts by resistance R 3, the high-pass filtering circuit that capacitor C 2 constitutes, the outfan of high-pass filtering circuit inserts the in-phase input end of the amplifier A3 in the main amplifying circuit, RA, RL, LA, K1, K2, K3, K4, K5, nine electrodes of K6 are received the input of a passage respectively, RA, RL, the outfan of amplifier A2 in the buffer amplifier circuit that the LA electrode is connected links to each other with the inverting input of amplifier A4 in the right lower limb RL drive circuit simultaneously, small-signal on the electrode, by the low pass circuit limiting bandwidth, the impedance matching of buffer amplifier circuit makes the electrocardiosignal of high impedance be converted to low-impedance signal, be beneficial to main amplifying circuit and amplify electrocardiosignal under lower hot-tempered sound, the amplification by main amplifying circuit makes signal be amplified to the needed level of analog digital conversion; And driven-right-leg circuit and high-pass filtering circuit are respectively applied for and improve common mode rejection ratio and baseline drift.

After adopting foregoing circuit to constitute, compared with prior art has following advantage: 1, because this utility model is sent into the bluetooth baseband circuit to the electrocardiosignal after handling by the RS232 communication interface modulates, enter the RF IC emission again, realized the wireless transmission of electrocardiosignal, make that 12 lead electrocardiogram can the dynamic synchronization record, effectively the patient is monitored in real time; 2, in bedside monitoring, also need not the cable transmission electrocardiosignal to handling display system, improve greatly, improve patient's quality of life effectively by the degree of freedom of guardianship; 3, owing in analog circuit, use operational amplifier as main devices, cost is low, good electric property and use in high conformity, make nine amplification channels that consistent as far as possible amplification be arranged, after the A/D conversion, in single-chip microcomputer, finish whole 12 lead calculated signals in digital mode, rather than adopt analog circuit to calculate, therefore greatly reduce the distorted signals that causes in the analog circuit.

The utility model is described in further detail below in conjunction with drawings and Examples.

Fig. 1 is a functional-block diagram of the present utility model.

Fig. 2 is this utility model center electric analoging signal modulate circuit figure.

Fig. 3 is analog digital conversion and single chip circuit figure.

Fig. 4 is interface microcontroller and a blue tooth wireless communication circuit diagram in this utility model.

As shown in Figure 1, this utility model is by cardiac diagnosis lead electrode 1, ECG simulator signal conditioning circuit 2, analog to digital conversion circuit 3, single-chip microcomputer 4, RS232 communication interface 5 and blue tooth wireless communication module 6 constitute, the electrocardiosignal that cardiac diagnosis lead electrode 1 detects is carried out signal processing by cardiac diagnosis lead cable transmission to ECG simulator signal amplification circuit 2, electrocardiosignal is adjusted to the signal potential that keeps relative and is concerned after analog to digital conversion circuit 3 converts digital signal to, enter single-chip microcomputer 4 by analog-to-digital digital signal through universal serial bus, in single-chip microcomputer, digitized electrocardiosignal is carried out digital filtering and the computing of leading, by RS232 communication interface 5 the cardiac diagnosis lead signal of serial form is sent into blue tooth wireless communication module 6, modulate the laggard radio frequency integrated circuit of going into through the voltage controlled oscillator in blue tooth wireless communication module 6 baseband circuits and phase-locked loop circuit, through the RF circuit, the duplex allotter is launched for signal records such as electrocardiogram monitor system work station or electro-cardiographs, analytical system receives the post analysis processing or uses.

ECG simulator signal conditioning circuit 2 is made up of nine identical ECG simulator signal condition passages and right lower limb RL drive circuit 11 as shown in Figure 2, and each passage is made of low pass circuit 7, buffer amplifier circuit 8, high-pass filtering circuit 9, main amplifying circuit 10; Resistance R 1, resistance R 2, capacitor C 1 and amplifier A1 constitute low-pass network, one end of resistance R 1 is the input of passage, the outfan of amplifier A1 inserts the in-phase input end of the amplifier A2 in the buffer amplifier circuit 8, the outfan of amplifier A2 inserts by resistance R 3, the high-pass filtering circuit 9 that capacitor C 2 constitutes, the outfan of high-pass filtering circuit 9 inserts the in-phase input end of the amplifier A3 in the main amplifying circuit, RA, RL, LA, K1, K2, K3, K4, K5, nine electrodes of K6 are received the input of a passage respectively, RA, RL, the outfan of amplifier A2 in the buffer amplifier circuit that the LA electrode is connected links to each other with the inverting input of amplifier A4 in the right lower limb RL drive circuit simultaneously, amplifier adopts FET four high guaily unit TL074, with a passage is example: the small-signal on the electrode, R1 before the amplifier A2 in buffer amplifier circuit 8, R2, in the low-pass network that C1 constitutes bandwidth is controlled in the 120Hz, through buffer amplifier A1, after the impedance conversion of A2, make the electrocardiosignal of high impedance be converted to low-impedance signal, be beneficial to main amplifying circuit 10 and under lower noise, amplify electrocardiosignal, pass through C2 again, R3 is provided with a high pass circuit 9, be used to improve baseline drift, (bandpass characteristics 3db) is to satisfy the frequency response needs of ecg amplifier so just to keep 0.05Hz～120Hz before main amplifier stage, behind the amplifier A3 in main amplifying circuit 10, signal is amplified to ± level of 2.5V, to adapt to the requirement of analog to digital conversion; And right lower limb RL drive circuit 11 is used to improve common mode rejection ratio.

As Fig. 3, shown in Figure 4, ECG simulator signal after careful electric analoging signal modulate circuit 2 amplifies enters A-D converter TLC2543 by the outfan of the amplifier A3 in each passage main amplifying circuit 10, TLC2543 is the serial analog-digital conversion ic of one 11 passage, nine passage electrocardiosignaies convert digital signal at TLC2543, after the A/D conversion, enter single chip computer AT 89C51 by universal serial bus, in AT89C51, finish whole 12 lead calculated signals in digital mode, computational methods such as following table: the title of leading definition I I=LA-RA II II=LL-RA III III=LL-LAaVR aVR=RA-0.5 (LA+LL) aVL aVL=LA-0.5 (LL+RAaVF aVF=LL-0.5 (LA+RA) V1 V1=K1-0.333 (LA+RA+LL) V2 V2=K2-0.333 (LA+RA+LL) V3 V3=K3-0.333 (LA+RA+LL) V4 V4=K4-0.333 (LA+RA+LL) V5 V5=K5-0.333 (LA+RA+LL) V6 V6=K6-0.333 (LA+RA+LL)

RA wherein, LA, RL, LL are respectively four limb electrodes, K1-K6 is respectively six chest electrodes.

Single-chip microcomputer is by the digital filtering to nine tunnel electrocardiosignaies, lead computing and communication, in single-chip microcomputer with eight tunnel lead signals by not circuit and audion, the light idol is formed the serial communication circuit of RS232 standard, convert TTL positive logic level signal to bluetooth module required negative logic level by RS-232 and be sent to blue tooth wireless communication module ROK 101007/1, the bluetooth communication circuit is the mode with module, internal circuit is manufacturer's shielding, be connected by the connecting pin of bluetooth module definition and the communication port of RS232 standard, communications protocol according to definition can realize the wireless transmission of data, passes through radio circuit after the baseband circuit control modulation of the electrocardiosignal after the processing in bluetooth communication module, the emission of duplex allotter.

Blue tooth wireless communication module 6 is generic radio communication interfaces that a frequency is 2.45GHz, and it can be set up wireless connections and carry out junction service by a special networks between various portable equipments.The technical characteristic of bluetooth is:

-with the character rate transmission of a per second 1M code element, make full use of the maximum effective bandwidth of channel;

-fast frequency-hopped avoiding interference;

-variable power supply output makes interference reduction arrive minimum;

-adopt the short packages transmission to strengthen capacity of resisting disturbance;

-confirm that fast the coding that allows the additional low speed rate is sent on the link;

The voice coding of-Continuously Variable Slope delta modulation can be under the situation of high bit-error operate as normal;

-packet type is supported multiple application flexibly;

-radio air interfaces makes power consumption reach minimum;

Bluetooth basic fundamental summary is:

-each is small-sized, high-performance, integrated wireless set all have IEEE 802 prescribed by standard 48 unique bit addresses;

-open free the frequency range of 2.45GHz ISM, the whole world can freely be used;

-10 meters is the communication range that is suitable for mobile communication market and commercial user most;

-total speed is 1Mbit/s, and it is 721kbit/s that point-to-point connects the maximum data transfer rate that allows.

Claims (2)

1, a kind of ecg signal acquiring device, it is characterized in that: by cardiac diagnosis lead electrode (1), ECG simulator signal conditioning circuit (2), analog to digital conversion circuit (3), single chip circuit (4), RS232 communication interface (5) and blue tooth wireless communication module (6) constitute, the electrocardiosignal that cardiac diagnosis lead electrode (1) detects is carried out signal processing by cardiac diagnosis lead cable transmission to ECG simulator signal amplification circuit (2), electrocardiosignal is adjusted to the signal potential that keeps relative and is concerned after analog to digital conversion circuit (3) converts digital signal to, enter single-chip microcomputer (4) by analog-to-digital digital signal through universal serial bus, in single-chip microcomputer (4), digitized electrocardiosignal is carried out digital filtering and the computing of leading, by RS232 communication interface (5) the cardiac diagnosis lead signal of serial form is sent into blue tooth wireless communication module (6), modulate the laggard radio frequency integrated circuit of going at baseband circuit in blue tooth wireless communication module (6), through the RF circuit, the duplex allotter is launched for signal records such as electrocardiogram monitor system work station or electro-cardiographs, analytical system receives the post analysis processing or uses.

2, ecg signal acquiring device according to claim 1, it is characterized in that: described ECG simulator signal conditioning circuit (2) is made up of nine identical ECG simulator signal condition passages and right lower limb RL drive circuit (11), and each passage is made of low pass circuit (7), buffer amplifier circuit (8), high-pass filtering circuit (9), main amplifying circuit (10); Resistance R 1, resistance R 2, capacitor C 1 and amplifier A1 constitute low-pass network, one end of resistance R 1 is the input of passage, the outfan of amplifier A1 inserts the in-phase input end of the amplifier A2 in the buffer amplifier circuit (8), the outfan of amplifier A2 inserts by resistance R 3, the high-pass filtering circuit (9) that capacitor C 2 constitutes, the outfan of high-pass filtering circuit (9) inserts the in-phase input end of the amplifier A3 in the main amplifying circuit, RA, RL, LA, K1, K2, K3, K4, K5, nine electrodes of K6 are received the input of a passage respectively, RA, RL, the outfan of amplifier A2 in the buffer amplifier circuit that the LA electrode is connected links to each other with the inverting input of amplifier A4 in the right lower limb RL drive circuit simultaneously, small-signal on the electrode, by low pass circuit (7) limiting bandwidth, the impedance matching of buffer amplifier circuit (8) makes the electrocardiosignal of high impedance be converted to low-impedance signal, be beneficial to main amplifying circuit (10) and amplify electrocardiosignal under lower hot-tempered sound, the amplification by main amplifying circuit (10) makes signal be amplified to the needed level of analog digital conversion; And driven-right-leg circuit (11) and high-pass filtering circuit (9) are respectively applied for and improve common mode rejection ratio and baseline drift.

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