CN2236817Y - Recording and displaying device for heart sounds envelope marking and detecting chart - Google Patents

Abstract

The utility model is composed of a heart sound channel, an A/D converter for an electrocardiochannel, and a micro-computer, wherein, the heart sound channel is formed by the sequential connection of a multichannel heart sound sensor, an amplifier, a filter, a sensitivity controller, and an envelope detector; the electrocardiochannel is composed of an electrocardioelectrode, a preceding stage floating amplifier, and a sensitivity controller. The signals from the both channels which are sent to the A/D converter are stored, displayed, and printed after processed by the microcomputer. The utility model has the advantages of clear graphic, ordered rise and fall, convenient recording and analysis, and convenient operation. The utility model is a novel detecting device for medical treatment which provides basis for the research of the heart sound.

Description

Hear sounds envelope scaling graph is recorded display device

This utility model relates to a kind of hear sounds checkout gear, particularly can accurate recording hear sounds envelope curve image record display device.

It is to use traditional extremely widely inspection method in the clinical diagnosis work that hear sounds detects.From French doctor Lan Nike in 1816 had at first created wooden monotubular stethoscope in medical practice since, nearly 200 years so far though the utensil that hear sounds is detected has many improvement, was main means with traditional phonocardiogram still aspect phonocardiogram so far.This figure is the hear sounds wave of oscillation curve at a few auscultation position record of pareordia, when record high frequency hear sounds and heart murmur, overlapping, the ambiguous phenomenon of lines is often arranged, and influence brings difficulty to the identification and the analysis of figure to diagnosis.Though there are problems such as image diffusion, quantity of information lack too in the intentionally research of audio frequency spectrogram in recent years, has influenced and has applied.

Traditional phonocardiogram is to constitute by changing frequent wave of oscillation curve, and it is represented to diagnosing valuable information by the peak valley of the envelope of its wave of oscillation, so hear sounds envelope figure can keep phonocardiographic key character, remove the wave of oscillation curve little to diagnostic significance, make figure clear, be convenient to identification and analyze.

Based on above-mentioned analysis as can be known, adopting hear sounds envelope figure is science as clinical analysis of diagnosis.

The purpose of this utility model is utilization modern electronic technology and MICROCOMPUTER PROCESSING means, develop a kind of can intuitively show hear sounds envelope curve, working stability, reliably, clear image, the hear sounds envelope scaling graph that can store, print record display device.

Structure of the present utility model has reached above-mentioned purpose of design: it is by the multiple tracks heart sound transducer, amplifier, wave filter, sensitivity controller, the envelope detector, A/D converter, microcomputer, display terminal and printer constitute, electrocardiosignal is as time synchronizing signal, this electrocardiosignal passage is by electrocardioelectrode, floating ground of prime amplifier, sensitivity controller constitutes, the wave filter of hear sounds passage has low frequency, intermediate frequency, high frequency, the output of full range fourth gear, the output signal of envelope detector output signal and electrocardiac channel sensitivity controller is all sent into A/D converter and is carried out signal processing, signal mixing microcomputer after the processing, carry out date processing by computer, and control shows and printing.

This utility model adopts 6 identical channel parallel work, choose 30 mapping points altogether in the front, heart sound information is through amplifying, filtering, sensitivity control are after the output of envelope detector, electrocardiosignal is all delivered to mould/number conversion circuit conversion with the cardiechema signals of envelope detector output and is become digital signal behind the floating ground of prime amplifier and sensitivity control circuit, storage after MICROCOMPUTER PROCESSING again, show, print.

The utlity model has following remarkable advantage:

1. survey wide, test point is many, more common phonocardiogram more system, more fully show each position hear sounds feature of front, and constitute a width of cloth front hear sounds sound field situation map.This is the irrealizable progress of traditional hear sounds inspection diagnosis.

2, this utility model demonstration, the hear sounds envelope figure that prints are array combination figure who assumes overall responsibility for 30 mapping position hear sounds features, can play a figure at hands, the important function that the overall situation is in one's hands also can be amplified arbitrarily local figure and anatomized, and is easy to differentiate normal cardiac sound and various heart murmur.

3. be convenient to comparative study,, be convenient to find out the peak position of hear sounds and heart murmur, peak arteries and veins trend, noise form and involve scope etc. because the graphics system of each mapping point is arranged in one.

4. has high performance heart sound transducer equipment series in 6 roads and dedicated microcomputer software, can finish the work such as record, demonstration, printing, storage of hear sounds envelope quickly and accurately, has the operation sequence prompt facility, be easy to grasp operation, being convenient to promote, is a kind of effective equipment of novel detection hear sounds.

Describe this utility model in detail below in conjunction with accompanying drawing:

Fig. 1 hear sounds envelope scaling graph is recorded the display device block diagram.

Fig. 2 hear sounds envelope amplifier circuit figure.

Fig. 3 ecg amplifier circuit diagram.

Fig. 4 hear sounds envelope signal A/D converter circuit diagram.

Fig. 5 hear sounds envelope scaling graph recording arrangement axonometric chart.

The hear sounds envelope figure of 30 mapping points that Fig. 6 display shows.

Hear sounds envelope scaling graph is recorded display device as shown in Figure 1, constitute by 6 road heart sound transducers, pre-amplifier, wave filter, sensitivity controller, envelope detector, electrocardioelectrode, floating ground of prime amplifier, sensitivity controller A/D converter, microcomputer, display and printer, the output signal of hear sounds envelope detector and electrocardio sensitivity control is all delivered to A/D converter and is carried out conversion, the digital information that the produces microcomputer of feeding, carry out date processing, storage by microcomputer, and control shows and printing.

Hear sounds pre-amplifier N1 is by low noise, and high-performance integrated transporting discharging OP-07 and peripheral circuit constitute.The cardiechema signals that heart sound transducer is examined is delivered to 4 groups of second-order bandpass filter N2 that are made of TLO84 after N1 amplifies, its frequency band meets high, medium and low, complete 4 sections hear sounds and detects the frequency range requirement, each frequency band filter is selected by band switch S1, and each frequency range amplification is inversely proportional to corresponding hear sounds frequency range amplitude.

Integrated transporting discharging N3a and band switch S1 constitute sensitivity controller, the sensitivity of each adjacent gear differs 6dB, N3b～3d constitutes hear sounds envelope detector, detect the positive half cycle envelope of cardiechema signals, the time constant of cymoscope is determined by C16 (R14+RP2), circuit is adjusted to 14ms, and time constant is excessive, too small all to be unfavorable for clear reflection envelope shape.

Permutator S3 is used for selecting original cardiechema signals of output or hear sounds envelope signal.

The heart sound amplifier of instrument has 6, and the circuit structure of each heart sound amplifier is identical.N4～7 and peripheral circuit thereof are formed floating ground formula electrocardio pre-amplifier, this amplifier be floated on " " on, promptly break away from contacting of " ", thereby can guarantee the safety of tested human body with city's net power supply.N4,5,6a constitute the high-performance data amplifier, and its noise is minimum, and common mode rejection ratio is very high, and promptly good in anti-interference performance is very suitable for amplifying faint human ecg signal.The intergrade that N7 forms is further amplified electrocardiosignal.Integrated transporting discharging N6a, photoelectrical coupler N8 constitute photoelectricity coupled signal output stage, and its effect is that the electrocardiosignal that will be exaggerated is delivered to post-amplifier in the mode of opto-electronic conversion from the prime isolated amplifier, and N9a and band switch S2 constitute the sensitivity controlled stage.N9b, N9c constitute civil power 50HZ suppressor and signal output stage.When switch S 5 is connected the 50HZ suppressor of being made up of assembly Z and N9c and worked, can reduce the 50HZ civil power interference component in the electrocardiosignal effectively.

Audion V2, V3, transformator T, integrated voltage stabilizer N10, N11 and adjunct circuit thereof constitute the isolation agitator of floating ground amplifier, to become higher-order of oscillation electric current by the DC current that E provides, be coupled to VD7～CD10 rectification through transformator T, output ± 15V is as the power supply of floating ground of prime amplifier after N10, the N11 voltage stabilizing.

A/D converter is made of U1～U5, and U1 adopts CD4051, and U2 adopts AD0801, and U3 adopts 74LS245, and U4, U5 adopt 74LS138.Its input signal is taken from hear sounds envelope detector output end, and output signal is delivered to the microcomputer input interface.

During detection, in the person under inspection front by helping interbody spacer the matrix mapping point of 6 groups of 5 row to be set, totally 30.Place hear sounds, EGC sensor, divide and record hear sounds envelope and electrocardiosignal from each mapping position 5 times.During record, the person under inspection keeps quite, and suspend to breathe for 3 seconds, and recording can screen display hear sounds envelope mapping image after finishing, and can print immediately or with image memory, note the common heartfelt wishes figure of person under inspection simultaneously.

As seen from Figure 6, above six groups of every row of the five elements, show 30 shirtfront sound field mapping point hear sounds envelope positive polarity waveforms altogether.Bottom line is the hear sounds waveform, as the contrast reference.

Claims (2)

1, hear sounds envelope scaling graph is recorded display device, comprise A/D converter, microcomputer, display terminal and printer, hear sounds passage and electrocardiac channel constitute in it is characterized in that, the hear sounds passage is by the multiple tracks heart sound transducer, amplifier, wave filter, sensitivity controller, the envelope detector is linked in sequence and forms, electrocardiac channel is by electrocardioelectrode, floating ground of prime amplifier, sensitivity controller constitutes, envelope detection device outfan is the cardiechema signals outfan, the sensitivity controller outfan is the electrocardiosignal outfan, the two paths of signals outfan all connects analog-digital converter, analog-digital converter output termination microcomputer, microcomputer output connects display and printer respectively.

2, record display device according to the described hear sounds envelope of claim 1 scaling graph, it is characterized in that heart sound transducer has 6 roads, wave filter has low frequency, intermediate frequency, high frequency, the output of full range fourth gear.

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