CN202437169U

CN202437169U - Electronic stethoscope

Info

Publication number: CN202437169U
Application number: CN2012200007488U
Authority: CN
Inventors: 房春英; 张兴华; 才智
Original assignee: Individual
Current assignee: Individual
Priority date: 2012-01-04
Filing date: 2012-01-04
Publication date: 2012-09-19
Anticipated expiration: 2022-01-04

Abstract

The utility model provides an electronic stethoscope, which comprises a pickup head MIC, an amplification circuit, a low/high-pass filter and a power amplifier, wherein the signal output end of the pickup head MIC is connected with the signal input end of the amplification circuit; the signal output end of the amplification circuit is connected with the signal input end of the low/high-pass filter; and the signal output end of the low/high-pass filter is connected with the signal input end of the power amplifier. The electronic stethoscope has high waveform analysis capability; sound frequency beyond a set frequency band can be filtered, so that a clear amplified signal can be obtained; and the electronic stethoscope is mainly designed to input extracted heart sound and lung sound signals into a computer for processing such as time-domain analysis and frequency-domain analysis in the computer so as to lay a good foundation for further diagnosis.

Description

A kind of electronic stethoscope

Technical field

This utility model relates to a kind of electronic stethoscope, belongs to technical field of medical instruments.

Background technology

Existing auscultation with stethoscope hear sounds; Though operational approach is simple, often be difficult to capture some faint but very important biological sound that the inside of human body internal organs send, cause the doctor can't in time make diagnosis; And the foundation of diagnosis is mainly according to doctor's experience, and accuracy is relatively poor.Say that from another angle people's ear is the comprehensive effect of the sound intensity and frequency to the sensitivity of sound, thereby some pathological characters are difficult to catch, cause being difficult to auscultatory sound is carried out quantitatively, analyzes accurately.Though had some electronic stethoscopes at present, improved the accuracy that rhonchus is analyzed, existing electronic stethoscope only extracts electrocardiosignal, lung sound is not extracted, and the quantitative analysis of rhonchus also is difficult to reach the standard of the accurate diagnosis state of an illness.

Summary of the invention

This utility model provides a kind of electronic stethoscope, is used to solve existing electronic stethoscope and only extracts electrocardiosignal, lung sound is not extracted, and the quantitative analysis of rhonchus also is difficult to reach the problem of the accurate diagnosis state of an illness.

The purpose of this utility model realizes through following technical scheme:

A kind of electronic stethoscope; Comprise pick-up head MIC, amplifying circuit, low high pass filter and power amplifier; The signal output part of said pick-up head MIC is connected with the signal input part of said amplifying circuit; The signal output part of said amplifying circuit is connected with the signal input part of said low high pass filter, and the signal output part of said low high pass filter is connected with the signal input part of said power amplifier.

The beneficial effect of this utility model is: have good analysis waveform ability; Can be with the sound frequency filtering beyond the frequency band that sets; So can obtain amplifying later signal clearly; The design of this electronic stethoscope mainly is for hear sounds and the lung acoustical signal extracted are input in the computer, so that in computer, do processing such as time and frequency domain analysis, has carried out the basis for further diagnosing.

Description of drawings

The structural representation of the electronic stethoscope that Fig. 1 provides for the specific embodiment of this utility model;

The electrical block diagram of the electronic stethoscope that Fig. 2 provides for the specific embodiment of this utility model;

The internal circuit configuration sketch map of the electronic stethoscope that Fig. 3 provides for the specific embodiment of this utility model.

The specific embodiment

Below in conjunction with accompanying drawing this utility model is described further:

As shown in Figure 1; The electronic stethoscope that this specific embodiment provides; Comprise pick-up head MIC1, amplifying circuit 2, low high pass filter 3 and power amplifier 4; The signal output part of pick-up head MIC1 is connected with the signal input part of amplifying circuit 2, and the signal output part of amplifying circuit 2 is connected with the signal input part of low high pass filter 3, and the signal output part of low high pass filter 3 is connected with the signal input part of power amplifier 4.

Concrete, the circuit theory of electronic stethoscope is as shown in Figure 2, and this electronic stethoscope is made up of pick-up head MIC, amplifying circuit, low high pass filter, power amplifier.Because the received frequency signal of pick-up head MIC is very faint and is the broadband, need and require the filtering clutter useless to auscultation its amplification.Therefore we need do high-precision amplification, filter circuit.Closed in the time of through S1 and S2, break off, ((signal of 100Hz-1200Hz) passes through, and signal is directly inputted to the mike input of PC after treatment for 20Hz-400Hz) and lung acoustic frequency scope can to select the heartfelt wishes frequency range.On PC, further handle again.

Power supply is supplied power by computer USB, the maximum 500mA of output: 5V, and diode D1, D2 prevent reversal connection, and through after the many pressure drops of 1.4V, supply power to about 3.6V, the fuse of recovery certainly of 400mA can be inserted in the back.Not adopting two electricity, is to should be the complexity that has increased circuit, takes all factors into consideration the selection single supply.

Microphone can adopt SG6050P omnidirectional electret capacitor microphone, owing to be the microphone of the omnidirectional selected for use, we attempt packing microphone in the stethoscopic hose into, can play good radio reception effect.

Adopt INA114 the small-signal that collects to be amplified the characteristics of INA114: size is little, precision is high, cheap, can be used for electric bridge, thermocouple, data acquisition, RTD pick off and Medical Instruments etc.INA114 only needs a non-essential resistance that any yield value between 1 to 10000 just can be set, and inner input protection can withstand long term exposure ± 40V, offset voltage low (50 μ V); Little (0.25 μ V/ ℃) drifts about; Common mode rejection ratio high (being 50dB during G=1000) is adjusted with laser, can work down at the voltage of ± 2.25V; Use battery (group) or 5V single supply system, quiescent current is 3mA to the maximum.INA114 adopts 8 pin Plastic Package or SOL-16 surface encapsulation to paste part, and the environment for use temperature is-40 ℃～+ 85 ℃.The internal circuit configuration figure of this specific embodiment is as shown in Figure 3.

LM358 is the double operational chip of using always, and S1 is high pass 20Hz when closed, is high pass 100Hz during disconnection, low pass 400Hz when S2 is closed, 1200Hz during disconnection.Be S1, when S2 was closed, through 20Hz-400Hz (heartfelt wishes), S1 was when S2 breaks off, through 100Hz-1200Hz (lung sound).P1 is a microphone plug among Fig. 2, and diameter is 3.5mm, inserts on the microphone interface of computer.

The technical scheme that adopts this specific embodiment to provide; Not only extracted electrocardiosignal but also extracted the lung acoustical signal; The signal that extracts is through the pick up collection, and signal is heard hear sounds and the lung acoustical signal after the amplification after through amplifying circuit, low high-pass filtering circuit, audio frequency amplifier.This equipment has good analysis waveform ability; Can be with the sound frequency filtering beyond the frequency band that sets; So can obtain amplifying later signal clearly; The design of this electronic stethoscope mainly is for hear sounds and the lung acoustical signal extracted are input in the computer, so that in computer, do processing such as time and frequency domain analysis, has carried out the basis for further diagnosing.

The above; Be merely the preferable specific embodiment of this utility model; These specific embodiment all are based on the different implementations under this utility model general idea, and the protection domain of this utility model is not limited thereto, and any technical staff who is familiar with the present technique field is in the technical scope that this utility model discloses; The variation that can expect easily or replacement all should be encompassed within the protection domain of this utility model.Therefore, the protection domain of this utility model should be as the criterion with the protection domain of claims.

Claims

1. electronic stethoscope; Comprise pick-up head MIC, amplifying circuit, low high pass filter and power amplifier; It is characterized in that; The signal output part of said pick-up head MIC is connected with the signal input part of said amplifying circuit, and the signal output part of said amplifying circuit is connected with the signal input part of said low high pass filter, and the signal output part of said low high pass filter is connected with the signal input part of said power amplifier.