CN2096969U - Monitor for heart rate of foetus - Google Patents
Monitor for heart rate of foetus Download PDFInfo
- Publication number
- CN2096969U CN2096969U CN 91216032 CN91216032U CN2096969U CN 2096969 U CN2096969 U CN 2096969U CN 91216032 CN91216032 CN 91216032 CN 91216032 U CN91216032 U CN 91216032U CN 2096969 U CN2096969 U CN 2096969U
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- CN
- China
- Prior art keywords
- circuit
- amplifier
- power supply
- operational amplifier
- signal feedback
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
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- Measuring Pulse, Heart Rate, Blood Pressure Or Blood Flow (AREA)
Abstract
The utility model belongs to a detecting instrument used for diagnosis, which relates to a monitor for heart rate of fetus, comprising a sound-electricity transducer, a high impedance amplifier, a filter circuit, a signal feedback circuit, and a power amplifier. The filter circuit is realized through a differential circuit composed of a resistor and an electrical condenser plus an integrated operational amplifier. The signal feedback circuit is composed of two resistors and an electric condenser which are connected in series to the input end of the integrated operational amplifier. A power supply mode of low voltage double-power is adopted by the utility model, making the entire circuit simple and safe.
Description
This utility model belongs to the detection instrument that is used for diagnostic purpose
Along with the raising of people to degree of attentiveness of future generation, the people that are about to be father and mother wish just immediately to know the growth situation of fetus before child's birth, and monitoring fetal heart frequency situation is a kind of effective method.Although at present to rein in the formula fetal heart monitor highly sensitive for a large amount of use multispectral of hospital clinical, can monitor fetal heart frequency reliably, but must involve great expense unexpectedly, circuit is complicated and need can not satisfy the hope that anemia of pregnant woman oneself monitors immediately to fetal heart frequency with necessary couplant when using.Chinese patent CN872139646 has provided a kind of electronic machine that can allow anemia of pregnant woman oneself carry out the fetal heart frequency monitoring, it comprises power amplifier and electroacoustic signal switching device, it is characterized in that design has electric signal transducer, excitation resonance functional piece and voltage to put device and is circuit with placed in-line form in turn and connects with above-mentioned power amplifier, electroacoustic signal transducer.
The purpose of this utility model is that the CN872139646 technology is improved, and designs that circuit is more simple, manufacturing cost is more cheap and the more reliable miniature fetal heart frequency audiomonitor of service behaviour.
Fetal heart frequency audiomonitor described in the utility model is made up of acoustic-electrical transducer, high-impedance amplifier, filter circuit, signal feedback circuit and power amplifier, filter circuit adds the big device of integrated transporting discharging by a resistance and capacitor and constitutes peaker and realize, signal feedback circuit by capacitors in series of two resistance to the input of integrated operational amplifier and constitute, and this utility model adopts the low-voltage double-power supply power supply mode, make entire circuit be simplified, and safe and reliable.
Fetal heart frequency audiomonitor described in the utility model uses No. 5 batteries of 2 joints, all the elements diameter of packing into is in the round plastic casing about 65mm, acoustic-electrical transducer is contained in the bottom, need only during use earplug is plugged just energized, whole fetal rhythm device is placed on anemia of pregnant woman's abdominal part, need not smear coupling agent, just can in insert earphone, hear fetal heart sound clearly.If change speaker, can monitor simultaneously for many people.
Fig. 1 is this utility model circuit diagram.
Fig. 2 is this utility model structural representation.
Below in conjunction with accompanying drawing this utility model is done progressive explanation.
Among Fig. 1: A1 is an acoustic-electrical transducer---high-quality piezoelectric patches, IC are low-power integrated operational amplifier, are homemade F012 in this example.R
1And C
2Be weakening resistance and electric capacity, R
2Be to be worth resistance, C partially
1And C
3Be filter capacitor, C
4And C
5Be coupling electric capacity, BG is a transistor, is import element 9014 in this example.R
4And R
5Be feedback resistance, R
7Be load resistance, A
2Be acoustic-electrical transducer, be the stereo insert earphone of import, R in this example
6It is current-limiting resistance.C
3, R
3Constitute peaker, IC constitutes filter circuit with integrated operational amplifier, C
4, R
4, R
5Be connected to integrated computing and go into the input formation signal feedback circuit of big device IC, in circuit, also adopt low-voltage double-power supply E
1, E
2Power supply mode, E
1, E
2Voltage is 1.5 volts.
(1) is earphone jack among Fig. 2, and (2) are battery case, and (3) are fetal heart frequency audiomonitor shell, and other is the installation site signal of each electric elements among Fig. 1.
Claims (2)
1, a kind of fetal heart frequency audiomonitor, comprise acoustic-electrical transducer, high-impedance amplifier, filter circuit, signal feedback circuit and power amplifier, it is characterized in that filter circuit adds integrated operational amplifier by a resistance and a capacitor and constitutes, signal feedback circuit by capacitors in series of two resistance to the input of integrated operational amplifier and constitute, in the circuit, adopt the low-voltage double-power supply power supply mode.
2,, it is characterized in that the voltage of described dual power supply is 1.5 volts according to the described audiomonitor of claim 1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 91216032 CN2096969U (en) | 1991-06-07 | 1991-06-07 | Monitor for heart rate of foetus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 91216032 CN2096969U (en) | 1991-06-07 | 1991-06-07 | Monitor for heart rate of foetus |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2096969U true CN2096969U (en) | 1992-02-26 |
Family
ID=4924028
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 91216032 Withdrawn CN2096969U (en) | 1991-06-07 | 1991-06-07 | Monitor for heart rate of foetus |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2096969U (en) |
-
1991
- 1991-06-07 CN CN 91216032 patent/CN2096969U/en not_active Withdrawn
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |