CN200966624Y

CN200966624Y - Two-purpose fetus heart sound monitoring instrument

Info

Publication number: CN200966624Y
Application number: CN 200620159430
Authority: CN
Inventors: 张为朵
Original assignee: Individual
Current assignee: Individual
Priority date: 2006-11-13
Filing date: 2006-11-13
Publication date: 2007-10-31
Anticipated expiration: 2016-11-13

Abstract

This is a fetal heart sound monitoring instrument, which is composed of an ultrasonic transducer, a cardiophony transmitter, a circuit board, a cabinet and an insert earphone. The ultrasonic transducer and the cardiophony transmitter are installed at both sides of the cabinet so as to form an integrated structure. This fetal heart sound monitoring instrument could be used by the pregnant woman to monitor the heart-beat of the fetus at all time, so as to detect the conditions of the child in the womb and take the relevant measures if necessary. This utility model boasts the usableness and multi-functions.

Description

Dual-purpose fetal heart sound monitor

Technical field

This utility model relates to a kind ofly can utilize supersonic Doppler effect and the dancing dual-purpose fetal heart sound monitor of auscultation mode audiometry heart of fetus.

Background technology

In order to guarantee normal fetal development, can use small-sized fetal heart sound to detect custodial care facility and regularly monitor fetal heart frequency every day, so that in time pinpoint the problems.At application number is 92237860, name is called and has proposed in the patent application of " supersonic Doppler fetal heart sound detector " a kind ofly to be made up of casing, handle, circuit board, polynary ultrasonic transducer, ultrasonic transducer jack, it is characterized in that and in the ultrasound wave jack, to insert the unit ultrasonic transducer, the ultrasound wave fetal heart sound detector of permutator is housed in the casing front.But its ultrasonic transducer is an independent external unit, need link by connecting electric wire and casing.At application number is 89204335, name is called in the patent application of " pocket electronics fetal heart sound acoustometer " and has proposed to be characterized as a probe of being made by the piezoelectric ceramics buzzing sheet of cheapness, the audio frequency amplifier of a high-gain low noise and an electroacoustic transducer (earphone or loudspeaker), the fetal heart sound acoustometer that connects with shielding line and plug, socket between the three.The common drawback of these two kinds of fetal heart sound checkout gears is that probe outer draws, signal processing circuit is contained in the casing, and the two all is an absolute construction, and probe is with all connecting with tie between the casing, thereby complex structure is all arranged, awkward problem.Ultrasonic listening and cardiophony mode respectively have pluses and minuses on the other hand, and above-mentioned two patents all are simple function, and function is complete inadequately.Therefore need a kind of probe to detect monitor with the two function fetal heart sounds that do not have tie between the casing.

Summary of the invention

This utility model provides the fetal heart sound monitor with ultrasound wave and two kinds of functions of auscultation that does not have tie between a kind of probe and the casing.

Technical scheme

This utility model adopts following technological means to achieve the above object.Ultrasonic transducer is installed in above the casing, and the cardiophony microphone is installed in inferior surface of machine case, and ultrasonic transducer, cardiophony microphone and casing are formed integral structure, thereby has realized not having between probe and the casing purpose of on line.Inferior surface of machine case be provided with short handle ultrasonic/the hear sounds function switch, in order to switching detection mode, thereby make the fetal heart sound monitor possess two kinds of functions.

Description of drawings

Fig. 1 is overall structure figure

Fig. 2 is a circuit diagram

The specific embodiment

In conjunction with the accompanying drawings can be to this utility model detailed description in addition.

(1) is ultrasonic transducer among the figure, and (2) are circuit boards, and (3) are casing, (4) be battery, (5) be the insert earphone plug, (6) are the cardiophony microphones, and (7) are the insert earphone ties, (8) be insert earphone, (9) be power amplification circuit, (10) are the agitator integrated circuits, (11) be short handle ultrasonic/the hear sounds permutator, (12) be diode detector, (13) are the insert earphone sockets.

Fig. 1 shows overall structure of the present utility model.Casing among the figure (3) adopts the ABS plastic injection moulding to make, and global shape resembles a fancy soap, and external dimensions is 80mm * 50mm * 30mm, and this design is fit to hand-held very much, does not have corner angle, and the anemia of pregnant woman is attached to it does not have sense of discomfort when abdominal part is surveyed.Ultrasonic transducer (1) adopts the transducer in the ultrasound atomizer, and the resonant frequency of this transducer is shaped as the piezoelectric ceramic piece of φ 20mm * 1mm between 1.6-1.8MC, owing to a large amount of its prices of making of reason are very low.Ultrasonic transducer (1) is installed in the top intermediate projections part of casing (3), outer surface exceeds 0.2mm than the surface of casing (3), what human body skin at first contacted when surveying like this is ultrasonic transducer (1), to guarantee with skin excellent contact being arranged.Cardiophony microphone (6) be installed in casing (3) below, also be mounted in the intermediate projections part of casing (3), directly contact skin with the surface energy that guarantees cardiophony microphone (6).Cardiophony microphone (6) adopts Electret condenser microphone, and this microphone uses in mobile phone and recorder in a large number, and is cheap, is easy to buying.Adopt the model of φ 10mm * 8mm in the present embodiment.Because ultrasonic transducer (1) is mounted in casing (3) both sides with cardiophony microphone (6), only need turn over a face during use and just can change a kind of function detection, very convenient.While, two kinds of detecting elements respectively had the work surface of oneself, did not involve mutually, can both reach the optimal detection effect separately.Circuit board (2) is installed in the bosom position of casing (3), above all electronic components all are positioned on.Circuit board (2) is selected the thick epoxy resin copper clad plate of 2mm for use, is of a size of 60mm * 40mm size.Battery (4) is installed on the circuit board (2), selects alkaline battery two joints for use No. 7, and advantage is durable and no leakage.Short handle is ultrasonic/hear sounds permutator (11) adopts double-point double-throw switch, is use on the small radio receiver the sort of, its handle is long to be 4mm, be positioned on casing (3) below, because of the casing wall thickness is 2mm, so shank only exposes 2mm after installing.Insert earphone plug (5) is the plug that insert earphone (8) carries, and present embodiment is selected φ 3.5mm specification for use.Insert earphone plug (5) is inserted on the insert earphone socket (13), and the signal that circuit board (2) is upward exported is passed to insert earphone plug (5) by insert earphone socket (13) and passed to insert earphone (8) playback by insert earphone on line (7) again.

Fig. 2 shows the circuit diagram of complete machine.Having constituted frequency of oscillation by oscillating integrated circuit (10) and ultrasonic transducer (1) in the circuit is the ultrasonic oscillator of 1.6-1.8MC, here ultrasonic transducer (1) be oscillating element be again inverting element, it also outwards launches 1.6-1.8MC when producing electric oscillation signal acoustical signal.Understand reflected back ultrasonic transducer (1) after running into fetus after acoustical signal passes in the anemia of pregnant woman abdominal cavity, because the transduction of ultrasonic transducer (1), reflected signal has produced the signal of telecommunication again in ultrasonic transducer (1) lining, this signal produces beat with former ultrasonic electrical signal in circuit, this Beat Signal is exactly a Doppler signal.The supersonic Doppler signal is processed into audio signal in circuit, we can hear it by insert earphone (8).The signal that can see ultrasonic transducer (1) in circuit is sent to diode detector (12), diode detector (12) with Doppler signal be processed into audio signal be sent to short handle ultrasonic/hear sounds permutator (11) selects, the signal after the selection is given power amplification circuit (9) again and is amplified.Power amplification circuit (9) is selected 2 amplifier LM358 for use, and this amplifier has 8000 times voltage amplification factor, then is controlled at 2000 times in the present embodiment, and is stable to guarantee circuit working.LM358 itself has the electric current fan-out capability of 20mA, therefore can directly drive insert earphone (8) pronunciation.What cardiophony microphone (6) picked up is the dancing sound of heart of fetus that spreads out of by anemia of pregnant woman's stomach wall, this be the same with air-conduction type auscultation with stethoscope principle.Cardiophony microphone (6) can be exported the signal of telecommunication of fetal heart sound after receiving fetal heart sound, this signal is sent to short handle, and ultrasonic/hear sounds permutator is selected, signal after the selection is delivered to power amplification circuit (9) again and is amplified, and then send insert earphone (8) playback.Oscillating integrated circuit (10) adopts the CD4069 integrated circuit in the present embodiment, and this is the CMOS hex inverter, only uses one of them phase inverter in our circuit.It is the germanium detector diode of 2AP9 that diode in the diode detector (12) is selected model for use.

The dual-purpose fetal heart sound monitor of making according to present embodiment can audiometry to 4 a month big fetal heartbeat under the ultrasound wave mode, can audiometry to 5 a month big fetal heartbeat under the cardiophony mode.Anemia of pregnant woman's quiet audiometry fetus situation that can lie on a bed at home, whether the growth that can understand fetus on the one hand is normal, can promote the emotion between the mothers and sons on the other hand.

With the increase of China's civilization degree, people more and more pay attention to the development condition of pregnancy period fetus, and are also more and more stronger to the monitoring consciousness of fetus.Appearance of the present utility model provides multiple functional utility easy to use to the anemia of pregnant woman to the monitoring of fetus, makes that guarding fetus at any time in family becomes possibility.Popularization of the present utility model will produce great pushing effect to the aristogenesis work of China.

Claims

1, a kind of dual-purpose fetal heart sound monitor of forming by ultrasonic transducer (1), cardiophony microphone (6), circuit board (2), insert earphone (8), casing (3), it is characterized in that ultrasonic transducer (1) be installed in casing (3) above, cardiophony microphone (6) be installed in casing (3) below, ultrasonic transducer (1) and cardiophony microphone (6) and casing (3) are formed integral structure, below casing (3), be equipped with short handle ultrasonic/hear sounds permutator (11).

2, the dual-purpose fetal heart sound monitor according to claim 1 is characterized in that cardiophony microphone (6) is an Electret condenser microphone.

3, the dual-purpose fetal heart sound monitor according to claim 1, the resonant frequency that it is characterized in that ultrasonic transducer (1) is 1.60--1.80MC.