CN2343973Y

CN2343973Y - Electronic noise-resisting stethoscope

Info

Publication number: CN2343973Y
Application number: CN 98227044
Authority: CN
Inventors: 赵建淮
Original assignee: Individual
Current assignee: Individual
Priority date: 1998-06-09
Filing date: 1998-06-09
Publication date: 1999-10-20
Anticipated expiration: 2008-06-09

Abstract

The utility model relates to an electronic noise-resisting stethoscope, belonging to a stethoscope. The rear sides of a sound pick-up (A) and a sound pick-up (B) are respectively connect with amplifiers and the signal which is output by the amplifier is mixed in a mixed potentiometer; the mixed signal is output to a high and low pass filter whose output end is connected with a power amplifier; the output end of the power amplifier is connected with a loudspeaker and a power supply inverter and the output end of a direct current inverter is connected with a rectifying bridge; after the voltage is stabilized with a filter capacitor and a voltage-stabilizing integrated circuit, the rectifying bridge supplies the electricity to an electronic stethoscope. The stethoscope effectively filter the background noise to enhance the precision of hearing the heart sound and the fetal sound and can accurately hear the heart sound and the fetal sound without considering the exterior environmental noise and the actions of the breath holding, etc., of the patient.

Description

Electronics noise suppression stethoscope

This utility model relates to a kind of stethoscope, particularly a kind of electronics noise suppression stethoscope.

Traditional stethoscope has a receiver, and receiver is connected with pipeline, and the end points of pipeline connects pick up, and this tradition stethoscope can only be as a kind of " microphone ", and its no noise suppression function can easily not listened to noise and tire sound in the hear sounds; Existing electronic stethoscope only is equivalent to one " microphone ", and they are subjected to the external world and patient's self noise jamming, and are quite big at people's the background noise that ears produced, and can't not hear noise and tire sound in the hear sounds.

The purpose of this utility model is to provide a kind of: no background noise, can not hear the electronics noise suppression stethoscope of noise and tire sound in the hear sounds.

The purpose of this utility model is achieved in that stethoscope is made up of electronic stethoscope and power inverter; Electronic stethoscope is by two pickup amplifiers, high and low pass filter amplifier, and power amplifier is formed;

Electronic stethoscope: pick up (A) is connected with amplifier (IC1a), and amplifier (IC1a) output is connected with mixed potentiometer (W9); Pick up (B) is connected with amplifier (IC1b), and amplifier (IC1b) output is connected with phase inverter (IC1c), and phase inverter (IC1c) output is connected with mixed potentiometer (w9); Mixed potentiometer (W9) output is connected with high pass filter (IC1d), is connected with amplifier (IC2b) and high and low pass filter behind the high pass filter (IC1d), and high-pass and low-pass filter output is connected with amplifier (IC3a); Amplifier (IC3a) is connected with power amplifier (IC4), and the power amplifier outfan is connected with speaker; Power inverter: battery (E) is connected with inversion audion (Q1, Q2), contravariant transformer (B), and contravariant transformer (B) outfan is connected with rectifier bridge (Q4), and rectifier bridge (Q4) is connected with integrated regulator (Q3) with filter capacitor.

Two pickup amplifiers: an end of pick up (A) is connected with ground; The other end is connected with positive pole, the resistance (R1) of capacitor (C1) simultaneously, and resistance (R1) connects power supply, and the negative pole of capacitor (C1) is connected with negative input end, the resistance (R2) of integrated amplifier (IC1a) simultaneously; The other end of resistance (R2) is connected with outfan, the resistance (R3) of integrated amplifier (IC1a) simultaneously, the positive input terminal of integrated amplifier (IC1a) is connected with positive source, the other end of resistance (R3) is connected with the negative pole of mixed potentiometer (W9), capacitor (C2) simultaneously, the other end ground connection of mixed potentiometer (W9), an end ground connection of pick up (B); The other end is connected with the positive pole of resistance (R8), capacitor (C6) simultaneously, another termination power of resistance (R8), the negative pole of capacitor (C6) is connected with negative input end, the resistance (R7) of integrated amplifier (IC1b) simultaneously, the other end of resistance (R7) is connected with outfan, the negative pole of capacitor (C5), the resistance (R6) of integrated amplifier (IC1b) simultaneously, the other end ground connection of resistance (R6), the positive input terminal of integrated amplifier (IC1b) is connected with positive source; The negative pole of capacitor (C5) is connected with the negative input end of integrated circuit phase inverter (IC1c), resistance (R5), be connected across between the negative input end and outfan of integrated circuit phase inverter (IC1c) after capacitor (C4) parallel connection, the positive input terminal of integrated circuit phase inverter (IC1c) is connected with positive source, integrated circuit phase inverter (IC1c) outfan while and resistance (R4), the positive pole of capacitor (C3) connects, the other end ground connection of resistance (R4), the negative pole of capacitor (C3) is connected with the intermediate contact of mixed potentiometer (W9), the negative pole of capacitor and the indirect of mixed potentiometer, the positive pole of capacitor (C2) is exported mixed signal.

High, low-pass filter amplifier: the positive pole of capacitor (C2) is connected with the negative input end of integrated circuit high pass filter (IC1d), the positive input terminal of integrated circuit high pass filter (IC1d) is connected with positive source, cross-over connection has resistance (R9) between the negative input end of integrated circuit high pass filter (IC1d) and outfan, resistance (R10), on the junction point of resistance (R9) and resistance (R10), a capacitor (C7) ground connection is arranged, the outfan of integrated circuit high pass filter (IC1d) is connected with the negative input end of integrated amplifier (IC2b) by resistance (R11), the positive input terminal of integrated amplifier (IC2b) is connected with positive source, resistance (R12), potentiometer (W5), potentiometer (W6), potentiometer (W7), potentiometer (W8) is connected across between the negative input end and outfan of integrated amplifier (IC2b), outfan while and potentiometer (W1) of integrated amplifier (IC2b), potentiometer (W2), potentiometer (W3), capacitor (C12) connects, the intermediate contact of potentiometer (W1) is connected back and resistance (R13) with its other end, capacitor (C9) series connection, capacitor (C9) back in parallel ground connection with capacitor (C8), resistance (R13) is connected with the positive input terminal of integrated circuit low pass filter (IC2c) with the junction point of capacitor (C9) simultaneously, and the negative input end of integrated circuit low pass filter (IC2c) is connected the back and is connected with the intermediate point of potentiometer (W5) by resistance (R14) with its outfan; The intermediate contact of potentiometer (W2) is connected the back and connects with resistance (R15), capacitor (C10) with its other end, by capacitor (C10) ground connection, resistance (R15) is connected with the positive input terminal of integrated circuit low pass filter (IC2d) with the junction point of capacitor (C10) simultaneously, and the negative input end of integrated circuit low pass filter (IC2d) is connected the back and is connected with the intermediate point of potentiometer (W6) by resistance (R16) with its outfan; The intermediate contact of potentiometer (W3) is connected the back and connects with resistance (R17), capacitor (C11) with its other end, by capacitor (C11) ground connection, resistance (R17) is connected with the positive input terminal of integrated circuit low pass filter (IC2a) with the junction point of capacitor (C11) simultaneously, and the negative input end of integrated circuit low pass filter (IC2a) is connected the back and is connected with the intermediate point of potentiometer (W7) by resistance (R18) with its outfan; Capacitor (C12) is connected with resistance (R19), potentiometer (W4), the intermediate contact of potentiometer (W4) is connected back ground connection with its other end, resistance (R19) is connected with the positive input terminal of integrated circuit high pass filter (IC3b) with the junction point of capacitor (C12) simultaneously, and the negative input end of integrated circuit high pass filter (IC3b) is connected the back and is connected with the intermediate point of potentiometer (W8) by resistance (R20) with its outfan; The outfan of integrated circuit high pass filter (IC2b) is connected with the negative input end of integrated amplifier (IC3a) by resistance (R21), the positive input terminal of integrated amplifier (IC3a) is connected with positive source, cross-over connection has resistance (R22) between the negative input end of integrated amplifier (IC3a) and its outfan, the outfan of integrated amplifier (IC3a) is by potentiometer (W10) ground connection, the intermediate point of potentiometer (W10) is connected with the negative pole of capacitor (C13), the positive pole output of capacitor (C13).

Power amplifier: the positive pole of capacitor (C13) is connected with 3 feet of integrated power amplifier (IC4); Cross-over connection capacitor (C14) between 6 feet, 8 feet; 2 feet, 4 feet connect the back and are connected with the common port of speaker Y1, earphone socket simultaneously, 8 feet of integrated power amplifier (IC4) are connected with the positive pole of capacitor (C15), the negative pole of capacitor (C15) is connected with the intermediate point of hands-free switch (K2), and 1 end of hands-free switch (K2) is connected with speaker (Y1); 2 ends are connected with the input of earphone socket.

Power inverter: the anodal of battery (E) is connected with 2 feet, the resistance (R23) of contravariant transformer simultaneously, the negative pole of battery (E) is connected with the emitter stage of inversion audion (Q1), the emitter stage of inversion audion (Q2) by switch (K1) simultaneously, resistance (R23) is connected with the base stage of inversion audion (Q1), 5 feet of contravariant transformer simultaneously, 4 feet of contravariant transformer are connected with the base stage of inversion audion (Q2), be connected with rectifier bridge between contravariant transformer 6 feet, 7 feet, rectification bridge output end is connected with capacitor (C16); The positive pole of outfan is connected with 1 foot of integrated regulator (Q3); 2 feet are connected with negative pole of output end; 3 feet are positive output end, are parallel with capacitor (C17), capacitor (C18) between positive output end and negative pole of output end, resistance (R24) be connected across between contravariant transformer 6 feet, 7 feet after light emitting diode (LED) is connected.

In the such scheme, weak hear sounds and noise that pick up (A) heart tonifying sound and noise and pick up (B) are picked up, upward mixed at mixed potentiometer (W9), the amplitude of noise equates that phase place is opposite, and noise is eliminated, and makes the background noiselessness; The cardiechema signals handled through high and low pass filter amplifying circuit, is filtered out useless sound, normal hear sounds and tire sound have been amplified enhancing, reached purpose of the present invention.The effective filtering of this stethoscope background noise, improve the precision listen to hear sounds, tire sound, do not need to consider extraneous environmental noise, do not need actions such as patient holds one's breath yet, can accurately listen to hear sounds and tire sound.

Describe in detail in conjunction with the embodiments with reference to the accompanying drawings below.

Fig. 1 is this utility model electronic stethoscope circuit diagram.

Fig. 2 is power inverter circuit figure of the present utility model.

Embodiment: the pick up of this electronic stethoscope (A) pick up (B) adopts Electret condenser microphone, the while pickoff signals, inhomogeneities on people's the hear sounds side of the existence height, with people's apex, aortic area, pulmonary area, TA for the loudest, the tire sound is all for the loudest with umbilicus, pick up (A) is aimed at the loudest zone, heart tonifying sound and noise have been picked up, pick up (B) then drops on pick up (A) on every side, pick up weak hear sounds and noise, pick up (A) pickoff signals is amplified sound through amplifier (IC1a), and the sound after the amplification is input to mixed potentiometer (W9); Pick up (B) pickoff signals is delivered to phase inverter (IC1c) and is carried out paraphase after amplifier (IC1b) amplifies, B signal after the paraphase is input to mixed potentiometer (W9), at mixed potentiometer (W9) that a-signal and B signal is mixed, because a-signal and B signal amplitude equate (with respect to noise), phase place is opposite, noise signal slackens greatly, and mixed potentiometer (W9) can suitably be regulated the noise amplitude size, and what output terminals A was exported is various hear sounds and very weak noise signal.(IC1, IC2, IC3 are TL082).

When being used for the tire sound, be analogous to cardiac auscultation, pick up (A) drop on umbilicus week then pick up (B) drop on umbilicus outside week, because paraphase phase superposition, can hear the weak sound of tire sound in output terminals A, this moment is because the unsymmetry of various noises, the source is different, might still have the existence of noise, sound by high pass filter (IC1d) filtering 3.4KHZ frequency, after amplifier (IC2b) amplification, successively (15-60HZ) by low pass filter (IC2c), (IC2d) (60-240HZ), (IC2a) (240-1KHZ) and high pass filter (IC3b) (1-4KHZ) carry out filtering, remove noise,, promote or the frequency of the corresponding section that decays by regulator potentiometer W5-W8, make us not hear the mitral stenosis rumbling diastolic murmur of low-key easily, and the noise of aortic incompetence to a high-profile, by regulator potentiometer W1-W4, regulate the node of high low filter, change frequency filtering easily, make us not hear first heart sound (55-58HZ) easily, second heart sound (62HZ) etc.; Through the signal of high and low pass filter, amplify through amplifier (IC3a), (W10) regulates total volume by volume potentiometer, and power amplifier (IC4) (LM386) amplifies, and one the tunnel sends into ultra-thin shape sound horn through hands-free switch (K2); One the tunnel sends in doctor's the ear through stereophone.

Power inverter is the power supply of electronic stethoscope.Power inverter is powered by battery (E), through inversion audion (Q1, Q2) and contravariant transformer (B), convert dc source to alternating current power supply, after rectifier bridge (Q4) rectification is unidirectional current, by (LM7812) voltage stabilizing of integrated regulator (Q3), capacitor (C16, C17, C18) filtering, export a direct current voltage and power to electronic stethoscope.

Claims

1, a kind of electronics noise suppression stethoscope, it is characterized in that: described stethoscope is made up of electronic stethoscope and power inverter; Electronic stethoscope is by two pickup amplifiers, high and low pass filter amplifier, and power amplifier is formed;

Electronic stethoscope: pick up (A) is connected with amplifier (IC1a), and amplifier (IC1a) output is connected with mixed potentiometer (w9); Pick up (B) is connected with amplifier (IC1b), and amplifier (IC1b) output is connected with phase inverter (IC1c), and phase inverter (IC1c) output is connected with mixed potentiometer (W9); Mixed potentiometer (W9) output is connected with high pass filter (IC1d), is connected with amplifier (IC2b) and high and low pass filter behind the high pass filter (IC1d), and high-pass and low-pass filter output is connected with amplifier (IC3a); Amplifier (IC3a) is connected with power amplifier (IC4), and the outfan of power amplifier (IC4) is connected with speaker; Power inverter: battery (E) is connected with inversion audion (Q1, Q2), contravariant transformer (B), and contravariant transformer (B) outfan is connected with rectifier bridge (Q4), and rectifier bridge (Q4) is connected with integrated regulator (Q3) with filter capacitor.

2, electronics noise suppression stethoscope according to claim 1, it is characterized in that: described pair of pickup amplifier: an end of pick up (A) is connected with ground; The other end is connected with positive pole, the resistance (R1) of capacitor (C1) simultaneously, and resistance (R1) connects power supply, and the negative pole of capacitor (C1) is connected with negative input end, the resistance (R2) of integrated amplifier (IC1a) simultaneously; The other end of resistance (R2) is connected with outfan, the resistance (R3) of integrated amplifier (IC1a) simultaneously, the positive input terminal of integrated amplifier (IC1a) is connected with positive source, the other end of resistance (R3) is connected with the negative pole of mixed potentiometer (W9), capacitor (C2) simultaneously, the other end ground connection of mixed potentiometer (W9), an end ground connection of pick up (B); Other end while and resistance (R8), the positive pole of capacitor (C6) connects, another termination power of resistance (R8), the negative pole of capacitor (C6) is connected with negative input end, the resistance (R7) of integrated amplifier (IC1b) simultaneously, the other end of resistance (R7) is connected with outfan, the negative pole of capacitor (C5), the resistance (R6) of integrated amplifier (IC1b) simultaneously, the other end ground connection of resistance (R6), the positive input terminal of integrated amplifier (IC1b) is connected with positive source; The negative pole of capacitor (C5) is connected with the negative input end of integrated circuit phase inverter (IC1c), resistance (R5), be connected across between the negative input end and outfan of integrated circuit phase inverter (IC1c) after capacitor (C4) parallel connection, the positive input terminal of integrated circuit phase inverter (IC1c) is connected with positive source, integrated circuit phase inverter (IC1c) outfan while and resistance (R4), the positive pole of capacitor (C3) connects, the other end ground connection of resistance (R4), the negative pole of capacitor (C3) is connected with the intermediate contact of mixed potentiometer (W9), the negative pole of capacitor and the indirect of mixed potentiometer, the positive pole of capacitor (C2) is exported mixed signal.

3, electronics noise suppression stethoscope according to claim 1, it is characterized in that: described height, low-pass filter amplifier: the positive pole of capacitor (C2) is connected with the negative input end of integrated circuit high pass filter (IC1d), the positive input terminal of integrated circuit high pass filter (IC1d) is connected with positive source, cross-over connection has resistance (R9) between the negative input end of integrated circuit high pass filter (IC1d) and outfan, resistance (R10), on the junction point of resistance (R9) and resistance (R10), a capacitor (C7) ground connection is arranged, the outfan of integrated circuit high pass filter (IC1d) is connected with the negative input end of integrated amplifier (IC2b) by resistance (R11), the positive input terminal of integrated amplifier (IC2b) is connected with positive source, resistance (R12), potentiometer (W5), potentiometer (W6), potentiometer (W7), potentiometer (W8) is connected across between the negative input end and outfan of integrated amplifier (IC2b), outfan while and potentiometer (W1) of integrated amplifier (IC2b), potentiometer (W2), potentiometer (W3), capacitor (C12) connects, the intermediate contact of potentiometer (W1) is connected back and resistance (R13) with its other end, capacitor (C9) series connection, capacitor (C9) back in parallel ground connection with capacitor (C8), resistance (R13) is connected with the positive input terminal of integrated circuit low pass filter (IC2c) with the junction point of capacitor (C9) simultaneously, and the negative input end of integrated circuit low pass filter (IC2c) is connected the back and is connected with the intermediate point of potentiometer (W5) by resistance (R14) with its outfan; The intermediate contact of potentiometer (W2) is connected the back and connects with resistance (R15), capacitor (C10) with its other end, by capacitor (C10) ground connection, resistance (R15) is connected with the positive input terminal of integrated circuit low pass filter (IC2d) with the junction point of capacitor (C10) simultaneously, and the negative input end of integrated circuit low pass filter (IC2d) is connected the back and is connected with the intermediate point of potentiometer (W6) by resistance (R16) with its outfan; The intermediate contact of potentiometer (W3) is connected the back and connects with resistance (R17), capacitor (C11) with its other end, be connected with the positive input terminal of integrated circuit low pass filter (IC2a) simultaneously with the junction point of capacitor (C11) by capacitor (C11) ground connection, resistance (R17), the negative input end of integrated circuit low pass filter (IC2a) is connected the back and is connected with the intermediate point of potentiometer (W7) by resistance (R18) with its outfan; Capacitor (C12) is connected with resistance (R19), potentiometer (W4), the intermediate contact of potentiometer (W4) is connected back ground connection with its other end, resistance (R19) is connected with the positive input terminal of integrated circuit high pass filter (IC3b) with the junction point of capacitor (C12) simultaneously, and the negative input end of integrated circuit high pass filter (IC3b) is connected the back and is connected with the intermediate point of potentiometer (W8) by resistance (R20) with its outfan; The outfan of integrated circuit high pass filter (IC2b) is connected with the negative input end of integrated amplifier (IC3a) by resistance (R21), the positive input terminal of integrated amplifier (IC3a) is connected with positive source, cross-over connection has resistance (R22) between the negative input end of integrated amplifier (IC3a) and its outfan, the outfan of integrated amplifier (IC3a) is by potentiometer (W10) ground connection, the intermediate point of potentiometer (W10) is connected with the negative pole of capacitor (C13), the positive pole output of capacitor (C13).

4, electronics noise suppression stethoscope according to claim 1 is characterized in that: described power amplifier: the positive pole of capacitor (C13) is connected with 3 feet of integrated power amplifier (IC4); Cross-over connection capacitor (C14) between 6 feet, 8 feet; 2 feet, 4 feet connect the back and are connected with the common port of speaker Y1, earphone socket simultaneously, 8 feet of integrated power amplifier (IC4) are connected with the positive pole of capacitor (C15), the negative pole of capacitor (C15) is connected with the intermediate point of hands-free switch (K2), and 1 end of hands-free switch (K2) is connected with speaker (Y1); 2 ends are connected with the input of earphone socket.

5, electronics noise suppression stethoscope according to claim 1, it is characterized in that: described power inverter: the anodal while of battery (E) and 2 feet of contravariant transformer, resistance (R23) connects, the negative pole of battery (E) is by the emitter stage of switch (K1) while with inversion audion (Q1), the emitter stage of inversion audion (Q2) connects, resistance (R23) simultaneously with the base stage of inversion audion (Q1), 5 feet of contravariant transformer connect, 4 feet of contravariant transformer are connected with the base stage of inversion audion (Q2), contravariant transformer 6 feet, be connected with rectifier bridge between 7 feet, rectification bridge output end is connected with capacitor (C16); The positive pole of outfan is connected with 1 foot of integrated regulator (Q3); 2 feet are connected with negative pole of output end; 3 feet are positive output end, are parallel with capacitor (C17), capacitor (C18) between positive output end and negative pole of output end, and resistance (R24) becomes between transformator 6 feet, 7 feet with being connected across after light emitting diode (LED) is connected.