CN2196783Y

CN2196783Y - Cardioelectric wave form generator

Info

Publication number: CN2196783Y
Application number: CN 94207145
Authority: CN
Inventors: 李志民; 陈凡; 罗四维
Original assignee: Beijing Jiaotong University
Current assignee: Beijing Jiaotong University
Priority date: 1994-03-24
Filing date: 1994-03-24
Publication date: 1995-05-10
Anticipated expiration: 2004-03-24

Abstract

The utility model discloses a cardioelectric wave form generator, which is formed by the connection of a wave form generating circuit, a wave form output circuit, a range detecting circuit, a counting displaying circuit, a one-minute signal generating circuit, a range display, and a reset circuit. The utility model provides the cardioelectric wave form generator completely simulating the number of times of the heart beat of the human body and the cardioelectric wave form in the heart beat; the utility model can especially produce the fixed proportion of the inclined ascent edge and the inclined descent edge; the utility model is a high-precision cardioelectric wave form generator with variable repetition period. The utility model provides a useful tool for the calibrating test of the cardioelectric pacemaker; the utility model can provide the wave form for the application of the special requirement; the utility model is especially suitable for the condition that the interval of the wave form needs the large-scale regulation. The utility model has good interchange ability.

Description

Cardioelectric wave form generator

The utility model relates to a kind of waveform frequency, high precision ecg wave form generator that amplitude is adjustable.Be applicable to the calibration testing of electrocardio pacemaker, the application that also can be special requirement provides different waveforms.Be specially adapted to WFS and need the situation of adjusting on a large scale.

In the prior art, waveform generator mostly is low frequency, high frequency, signal generator, signals such as general sine wave commonly used, square wave can only be provided.Main experiment, the test that is fit to electronic circuit.And the electrocardio generator is different from other generator, it should be fully can anthropomorphic dummy's systemic heart number and the ecg wave form during heartbeat, particularly can produce waveform oblique ascension edge and oblique deascension along fixed ratio, and variable ecg wave form of repetition period.At present, the ecg wave form generator that does not still have this kind function.

The purpose of this utility model is: provide a kind of complete can the anthropomorphic dummy ecg wave form when the number of systemic heart and heartbeat; Particularly can produce waveform oblique ascension edge and oblique deascension along fixed ratio, and variable high precision ecg wave form generator of repetition period.

The purpose of this utility model is achieved in that high precision ecg wave form generator, and it is electrically connected and is formed by, Waveform generating circuit, waveform output circuit, frequency control circuit, amplitude detection circuit, counting display circuit, one minute signal generating circuit, reset circuit, power circuit.

The utility model is compared the beneficial effect that is had with background technology: provide a kind of complete can the anthropomorphic dummy ecg wave form when the number of systemic heart and heartbeat; Particularly can produce waveform oblique ascension edge and oblique deascension along fixed ratio, and variable high precision ecg wave form generator of repetition period.And have intuitive display, characteristics such as safe and reliable, easy to operate.

The composition frame chart of Fig. 1 ecg wave form generator

The drawing of Fig. 2 ecg wave form generator master control

Fig. 3 ecg wave form produces circuit

Fig. 4 ecg wave form output circuit

Fig. 5 reset circuit

Fig. 6 amplitude detection circuit

Fig. 7 frequency control circuit

Fig. 8 produced circuit in one minute

Fig. 9 counts display circuit

Figure 10 power circuit

The utility model is described in further detail in conjunction with the accompanying drawings:

Ecg wave form generator (Fig. 1,2), it is by Waveform generating circuit

(Fig. 3), waveform output circuit (Fig. 4), amplitude detection circuit (Fig. 6), frequency control circuit (Fig. 7), one minute generation circuit (Fig. 8), counting display circuit (Fig. 9), power circuit (Figure 10), reset circuit (Fig. 5) are electrically connected and form.

Ecg wave form produces the ecg wave form that circuit (Fig. 3) produces standard.Different waveforms can be provided as required.Waveform by the amplitude and the output impedance of designing requirement, is exported the stable ecg wave form of high precision by waveform output circuit (Fig. 4).Detect the magnitude of voltage (millivolt level) that can reflect waveform peak by amplitude detection circuit (Fig. 6) then.Signal frequency control circuit (Fig. 7) is triggered by Waveform generating circuit, realizes the control to the ecg wave form time interval, and this interval can be regulated on a large scale, thereby realizes each wave period variable effect interval time.One minute signal of one minute signal generating circuit (Fig. 8) generation standard is delivered to counting display circuit (Fig. 9) control counting, thereby realizes that simulation heartbeat number of times shows.Reset circuit (Fig. 5) can make frequency control circuit, one minute signal generating circuit, counting display circuit, amplitude detection circuit reset simultaneously.Power circuit (Figure 10) provide working power for generator.

Fig. 3 is that ecg wave form produces circuit, and it is by hex inverter N1:A and N1:B(7404), two tetrad counter N2(74LS393), two input ends, four Sheffer stroke gate N3:A.B(7400), address counter N4(4040), EPROM Erasable Programmable Read Only Memory EPROM N5(2764), 12 D/A converter N6(DAC1230), resistance R 1-R4(1.5K), capacitor C 1(120P), C2(820P) form.Its function is to produce ecg wave form (also can provide difform waveform according to special requirement).The oscillator of being made up of N1:A and N1:B, CRY crystal oscillator, capacitor C 1, C2 and resistance R 1, R2 wherein, the N2:A frequency division is passed through in the pulse that produces about 8MHZ, as N4(4040) trigger pulse of address counter.N4 is as N5(2764) address generator, it is received on the address wire of N5, under the effect of trigger pulse, reads the data of each address storage respectively, and it is delivered to N6(DAC1230) data line on.Carry out the conversion of digital simulation amount by N6, make it become analog waveform signal with heartbeat.Owing to adopt 12 D/A converters, further improved the conversion accuracy of waveform.N3:A and N3:B guarantee N6 operate as normal sequential and are provided with, and are combined into the sequential of D/A needs by the fractional frequency signal of pulse.N6(DAC1230) 11,12 output to ecg wave form output circuit N7(LF357) 2,3.

Fig. 4 is the ecg wave form output circuit, and it is by broadband amplifiers N7(LF357), high precision operating amplifier N14(OP-07), resistance R 5(56K), the equal 10K of R6, R21(), R22(43K), the equal 1K of potentiometer P1, P2(), P5(20K), P7(10K) form.Its function is with N6(DAC1230) output the analog electrocardiogram signal carry out conversion and amplification.N7 is a wide-band amplifier, and the amplitude of output ecg wave form signal is regulated by potentiometer P1, and output direct current amplitude (millivolt value) is regulated by P2.P5 and P7 adjust the zero point of operational amplifier.Ecg wave form outputs to P8(OP-07), N9:A, N9:B carry out amplitude detection.

Fig. 6 is an amplitude detection circuit, and it is by high precision operating amplifier N8(OP-07), dual operational amplifier N9:A and N9:B(TL082), NPN high-frequency tube N10(2SC945) and S1 discharge switch, resistance R 6(10K), R7(1K), R8(100K), R9(10K), R10(10K), R11(1M), R14, R15(100), the equal 10K of R16, R17(), potentiometer P3, P4(10K), diode D1(1S1588), D2-D3(1SS104) form.This is a kind of circuit that keeps the analog signal voltage peak value, and it is stored in E1(10uf to the peak-peak of signal moment) lining.Be applicable to the maximal value of measuring individual pulse,, also can measure accurately even adopt the very slow pulse instrument of sample rate.In addition, after sampling finishes, if charging charge is not bled off; If next time, the signal peak of input was lower than last time peak value, then peak value just can not meet with a response.Therefore, discharge switch S1 should be installed, the accuracy of its measurement is further improved.P3 adjusts negative feedback.P4 adjusts N8(OP-07) zero point of operational amplifier.Amplitude detection is passed through CON2(3PIN) socket, connect the DPM milivoltmeter, the amplitude of carrying out shows.

Fig. 7 is the signal frequency control circuit, by time-base generator N11(NE555), d type flip flop N12:A(74LS74) or door N13:A in N13:B(74LS32), phase inverter N1:C(7404) and resistance R 18(10K), capacitor C 4(2UF), potentiometer P9(200k), P6(1m) constitute, between its each device and and other circuit between electrically connect as:

Time-base generator N11 4 with VCC and resistance R 12(10K) an end link to each other, 2 of N11 links to each other with 6, and by potentiometer P6(1M), P9(200K) link to each other with 7 of N11,7 of N11 passes through resistance R 18(10K) link to each other with VCC, capacitor C 4(2 μ F) one be connected to

N11

2,6, and potentiometer P6(1M) an end, other end ground connection; The output terminal 3 of N11 links to each other with 5 of N1:C, and links to each other with 2 of N13:A, and 6 of N1:C links to each other with 1 of N12:A, N12:A 3 with N2:B(74LS393) 10 the linking to each other of two tetrad counters, this signal is as clock trigger signal; 2 of N12:A is connected to VCC with 4,5 of N12:A is an output terminal, link to each other with H with 1 of N13:A respectively, H is connected to CON2(3PIN) 3 ends (in one-period, milivoltmeter is shown to be kept), the output terminal 3 of N13:A links to each other with 4 of N13:B, and 5 of N13:B connects and a door N3:D(7400) 11 and resistance R 13(1K) an end, the other end is connected to TEST and resistance R 17(10K) link to each other.When S2 connected, 11 of N3:D was a high level, made the output terminal 6 of N13:B also be high level, it is the RET1 signal, this signal is as the trigger pip of counting display circuit, and its function is that the waveform number is counted, thereby realizes that each wave period sends an ecg wave form signal.

Fig. 8 is one minute signal generating circuit, by time-base generator N16(NE555), two tetrad counter N15:A and N15:B(74LS393), d type flip flop N12:B(74LS74), two input ends, four Sheffer stroke gate N3:C(7400), and resistance R 23(10K), capacitor C 5(2 μ F), C6(0.01 μ F), potentiometer P8(200K) constitute.Function is one minute signal of generation standard.Wherein clock oscillator (comprising N16, R23, P8, C5, C6) produces the clock reference signal, carries out 128 frequency divisions, one minute signal of generation standard through frequency dividing circuit (comprising N15, N12:B, N3:C).This signal is delivered to counting display circuit control gate time, thereby realizes that simulation heartbeat number of times shows.Oscillator fine setting (P8) can be calibrated one minute signal of standard.

Constitute the connection between the components and parts of one minute signal generating circuit: 4 of time-base generator N16 links to each other with 8, and connection VCC and resistance R 23(10K) end, 5 of N16 links to each other with C6 one end, C6 other end ground connection, 2 of N16 links to each other with 6, and pass through P8(200K) with 7 and the resistance R 23(10K of N16) other end links to each other, C5(2UF) one be connected to 2 and 6 of N16, other end ground connection, 1 ground connection of N16, the output terminal 3 of N16 connects 13 of N15:B, 12 of N15:B connect respectively N15:A 2 and N3:D 11, and with CON(4PIN) 4 link to each other; 8 of N15:B links to each other with 1 of N15:A, N15:A 5,6, link to each other with 9,10 of N3:C respectively, 8 of N3:C links to each other with 11 of N12:B; 13 of N12:B links to each other with 12,13 of the end of S2 and N3:D; 12,10 of N12:B meets VCC, N12:B 9 with CON(4PIN) 2 be connected, i.e. INH signal, this signal is one minute signal of standard.

Fig. 9 is the counting display circuit, by decimal system counting/seven sections decoding/driver U1, U2, U3(4026), seven segment digital tubes L1, L2, L3(LED7), edge connector 5PIN forms.Passing through CON(5PIN) socket introduces control signal, power supply and ground.The RET1 signal is by N13:B(74LS32) 6 pin output, this signal is as the trigger pip of counting display circuit.Its function is that the waveform number is counted, and realizes that three decimal adds, one counting shows.The INH signal is by N12:B(74LS74) 9 pin output, through CON(5PIN) 2 pin add to the counting display circuit, as one minute signal of standard; And under this signal controlling, count, forbid and keep displaying contents, thereby realize the demonstration of simulation heartbeat number of times.The R signal is by N3:D(7400) 11 pin, pass through CON(4PIN) 4 pin add to the CON(5PIN of counting display circuit) 4 pin, realize the zero clearing of reset signal.

Fig. 5 is a reset circuit, by two input ends, four Sheffer stroke gate N3:D(7400), switch S 2, resistance R 12(10K), R13(1K) form.Produce the hand-reset signal, deliver to one minute and produce circuit, wave generator circuit, peak detection circuit and counting display circuit.

Figure 10 is a power circuit, by transformer T1, T2, bridge heap B1, B2, integrated regulator L1(LH7805CT), L2(LH7905CT), L3(LH7812CT), L4(LH7912CT), electrochemical capacitor E1, E2, the equal 2200 μ F of E3, E4(), the equal 220 μ F of E5, E6() and filter capacitor C1, C2, the equal 0.1 μ F of C3, C4(), the equal 22 μ F of C5, C6() form.The diagram circuit is a simple and practical bipolarity stabilized voltage supply, exportable ± 5v, ± four groups of voltages of 12v.～220v voltage adds to the elementary of T1, T2 transformer through sl power switch and F1 protective tube, and the secondary voltage after step-down adds to B1 respectively, B2 bridge heap carries out rectification.Add to 1 end and 2 ends of L1, L2 respectively from the pulsating volage of bridge heap B1 two ends output, thereby obtain ± the 5v DC voltage from 3 ends of L1, L2.Obtaining of ± 12v voltage is that the pulsating volage of exporting from B2 Qiao Dui two ends adds to 1 end and 2 ends of L3, L4 respectively, thereby obtains ± the 12v DC voltage from 3 ends of L3, L4.

Amplitude shows employing DPM7100 series panel table, stable and reliable for performance, this chip adopts double integration principle to carry out the A/D conversion, has therefore eliminated the influence of long-time integration stability with temperature coefficient, and have very strong antijamming capability, so conversion accuracy height.Polarity is determined in automatic zero set (AZS) automatically, and is easy to use.

Claims

1, a kind of ecg wave form generator, it is connected into by Waveform generating circuit, waveform output circuit, amplitude detection circuit, counting display circuit, one minute signal generating circuit, amplitude demonstration, reset circuit, it is characterized in that:

The signal frequency control circuit, constitute by time-base generator N11, d type flip flop N12: A or door N13: A and N13: B, phase inverter N1: C and resistance R 18, capacitor C 4, potentiometer P9, P6, between its each device and with other circuit between electrically connect as: 4 of time-base generator N11 links to each other with an end of VCC and resistance R 12,2 of N11 links to each other with 6, and link to each other with 7 of N11 by potentiometer P6, P9,7 of N11 passes through resistance R 18 and links to each other with VCC, capacitor C 4 one is connected to the end of 2,6 and the potentiometer P6 of N11, other end ground connection; Output terminal 3 and the N1 of N11: 5 of C links to each other, and links to each other N1 with 2 of N13: A: 6 of C links to each other N12 with 1 of N12: A: 3 of A links to each other with 10 of the two tetrad counters of N2: B, and this signal is as clock trigger signal; 2 of N12: A is connected to VCC with 4,5 of N12: A is an output terminal, respectively with N13: 1 of A links to each other with H, H is connected to 3 ends of CON2, output terminal 3 and the N13 of N13: A: 4 of B links to each other, 5 connections of N13: B and an end of 11 and the resistance R 13 of door N3: D, the other end links to each other with resistance R 17 with TEST;

One minute signal generating circuit, by time-base generator N16, two tetrad counter N15: A and N15: B, d type flip flop N12: B, with door N3: C, resistance R 23, capacitor C 5, C6, potentiometer P8 constitutes, 4 of time-base generator N16 links to each other with 8, and connection VCC and resistance R 23 1 ends, 5 of N16 links to each other with C6 one end, C6 other end ground connection, 2 of N16 links to each other with 6, and by 2 of P8 and N16,7 and resistance R 23 other ends link to each other, C5 one is connected to 2 and 6 of N16, other end ground connection, 1 ground connection of N16, the output terminal 3 of N16 connects 13 of N15: B, and 12 of N15: B connects 2 and the N3 of N15: A: 11 of D respectively, and links to each other with 4 of CON; 8 of N15: B links to each other N15 with 1 of N15: A: 5,6 of A links to each other N3 with 9,10 of N3: C respectively: 8 of C links to each other with 11 of N12: B; N12: B 13 with an end and the N3 of S2: 12,13 of D links to each other; 12,10 of N12: B meets VCC, N12: 9 of B is connected with 2 of CON.