CN103222863B - A kind of array fetal rhythm monitoring abdominal belt based on piezoelectric film sensor - Google Patents

A kind of array fetal rhythm monitoring abdominal belt based on piezoelectric film sensor Download PDF

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CN103222863B
CN103222863B CN201310191335.1A CN201310191335A CN103222863B CN 103222863 B CN103222863 B CN 103222863B CN 201310191335 A CN201310191335 A CN 201310191335A CN 103222863 B CN103222863 B CN 103222863B
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film sensor
piezoelectric film
abdominal belt
signal
circuit
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CN103222863A (en
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樊家良
杨强
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Harbin Institute of Technology
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Harbin Institute of Technology
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Abstract

An array fetal rhythm monitoring abdominal belt based on piezoelectric film sensor, the present invention relates to the monitoring field to heart of fetus. It is to be mostly to utilize fetal heart sound stethoscope, ultrasonic Doppler fetal gage, single-sensor to carry out fetal rhythm monitoring in order to solve existing fetal rhythm monitoring, and they exist error greatly or belong to monitoring or the low problem of precision of " invasion formula ". On the both ends of its abdominal belt, be respectively arranged with VELCRO, piezoelectric film sensor array is arranged on the middle part of abdominal belt; Testing circuit is arranged on abdominal belt; Affiliated testing circuit is made up of pre-differential amplifier circuit, filter circuit, mould/number conversion circuit, DSP module, memory module, interface module. Piezoelectric film sensor of the present invention has advantages of fast response time, highly sensitive and the linearity good, can ensure the accuracy detecting; Because piezoelectric film sensor quality is little, softness, durable, it can be good at and human body laminating after embedding abdominal belt, and man-machine efficacy is good.

Description

A kind of array fetal rhythm monitoring abdominal belt based on piezoelectric film sensor
Technical field
The present invention relates to the monitoring field to heart of fetus.
Background technology
Fetal heart monitoring in the past only for inferring whether fetus survives, and monitors by fetal rhythm now,Can diagnosing fetal energy reserve ability and foetus health situation. Fetal rhythm monitoring not only can be diagnosed tireYoungster's cardiac function, all right diagnosing fetal central nervous system function, avoids gravid woman's intrauterine deviceBorder deterioration causes irremediable damage to fetus nervous centralis. Fetal Heart Rate is of fetal rhythm monitoringImportant indicator.
Mostly early stage fetal rhythm monitoring is to utilize fetal heart sound stethoscope to measure Fetal Heart Rate, exists error large, anti-Interference performance is poor, needs the manually operated shortcoming of doctor or gravid woman. Wide in hospital at presentGeneral use ultrasonic Doppler fetal gage is as fetal rhythm monitoring means, this method cardinal principle be byInstrument initiatively sends ul-trasonic irradiation in fetus, from the various tissues of fetus, hyperacoustic difference is reflectedSignal obtains fetal rhythm information. Obviously, this is the monitoring method of a kind of " invasion formula ". Adopt this sideMethod continues to monitor security the unknown to fetus, has the potential hazard to parent and fetus. AdoptLower by the fetal rhythm monitoring equipment precision of single-sensor, measurement result is subject to maternal influence larger, andAnd can not make estimation to heart of fetus position.
Summary of the invention
The object of this invention is to provide a kind of array fetal rhythm monitoring abdomen based on piezoelectric film sensorBand, for solve the monitoring of existing fetal rhythm be mostly to utilize fetal heart sound stethoscope, ultrasonic Doppler fetal gage,Single-sensor carries out fetal rhythm monitoring, they exist error large or belong to " invasion formula " monitoring orThe problem that precision is low.
Described object realizes by following scheme: described one is based on piezoelectric membrane sensingThe array fetal rhythm monitoring abdominal belt of device is by abdominal belt, multiple piezoelectric film sensor, testing circuitComposition;
On the both ends of abdominal belt, be respectively arranged with VELCRO, multiple piezoelectric film sensors are pressed array rowRow are arranged on the middle part of abdominal belt; Testing circuit is arranged on abdominal belt; Described testing circuit is by preposition poorDivide amplifying circuit, filter circuit, mould/number conversion circuit, DSP module, memory module, interfaceModule composition; The signal output bus of piezoelectric film sensor array connects pre-differential amplifier circuitSignal input bus, the signal output bus of pre-differential amplifier circuit connects the letter of filter circuitNumber input bus, the signal input of signal output bus connection mode/number conversion circuit of filter circuit is totalLine, the data-out bus of mould/number conversion circuit connects the data input bus (DIB) of DSP module, DSPThe data storage output input of the data storage output input bus end connected storage module of moduleBus end, the data-out bus end of DSP module is connected with the data-out bus end of interface module;Described DSP module to fetus energy arithmetic is: the first step, utilize the outstanding letter of Teager energy operatorNumber high-energy region, the calculating of Teager energy operator adopts following formula:
y(n)＝x2(n-1)-x(n-1)*x(n-2)
Wherein: the fetal heartbeat signal of x (n) for receiving, y (n) is Teager energy signal; SecondStep, Teager energy signal is realized fetal heart frequency according to a preliminary estimate through auto-correlation processing; The 3rd step,The signal obtaining after auto-correlation processing, after peak estimation is processed, obtains the corresponding frequency of peak pointRate and energy; The 4th step, the energy signal that peak estimation obtains, through energy comparison processing, obtainsThe corresponding frequency of ceiling capacity, the heart rate using this frequency as fetus; Described DSP module 3-4To the algorithm of heart of fetus position be: at same plane, suppose heart of fetus position and described piezoelectricityThe coordinate position of thin film sensor is respectively (x, y) and (xi，yi), wherein i=0,1,2 ... 10, rjForSound source is to the range difference between j described piezoelectric film sensor, can be expressed as with equation:
r 0 2 = ( x - x 0 ) 2 + ( y - y 0 ) 2 r j 2 = ( x - x j ) 2 + ( y - y 0 ) 2 Δr j = r j - r 0 = cτ j
In formula, c is acoustic propagation velocity, τjFor sound-source signal is to j described piezoelectric film sensorWith to described piezoelectric film sensor (x0，y0) time delay value, from hyp definition, every pairTime delay value is determined a hyperbola, and two pairs of time delay values are determined two hyperbolas, and these two hyperbolicsThe position of intersecting point of line is cardiac position.
Piezoelectric film sensor of the present invention has fast response time, highly sensitive and linearThe advantage of having spent, can ensure the accuracy detecting; Because piezoelectric film sensor quality is little, softSoft, durable, it can be good at and human body laminating after embedding abdominal belt, and man-machine efficacy is good.
The present invention only need be wound around a described abdominal belt at gravid woman's belly, just can be to gravid womanFetal Heart Rate carries out Real-Time Monitoring, fetus cardiac position in gravid woman's body is made to estimation, energy simultaneouslyMeet the needs of pregnant woman's self-monitoring at home, and the monitored data of storage also can provide for doctorReference, has ensured the health of gravid woman and fetus.
Brief description of the drawings
Fig. 1 is overall structure schematic diagram of the present invention;
Fig. 2 is the structural representation of testing circuit 3 in Fig. 1.
Detailed description of the invention
Detailed description of the invention one: as shown in Figure 1 and Figure 2, it is by abdominal belt 1, multiple piezoelectric membraneSensor 2, testing circuit 3 form;
On the both ends of abdominal belt 1, be respectively arranged with VELCRO 1-1, multiple piezoelectric film sensors 2 are by battle arrayRow spread configuration is at the middle part of abdominal belt 1; Testing circuit 3 is arranged on abdominal belt 1; Described testing circuit 3By pre-differential amplifier circuit 3-1, filter circuit 3-2, mould/number conversion circuit 3-3, DSP module 3-4,Memory module 3-5, interface module 3-6 composition; The signal output of piezoelectric film sensor 2 arrays is totalLine connects the signal input bus of pre-differential amplifier circuit 3-1, pre-differential amplifier circuit 3-1'sSignal output bus connects the signal input bus of filter circuit 3-2, and the signal of filter circuit 3-2 is defeatedGo out the signal input bus of bus connection mode/number conversion circuit 3-3, the data of mould/number conversion circuit 3-3Output bus connects the data input bus (DIB) of DSP module 3-4, the data storage output of DSP module 3-4The data storage output input bus end of input bus end connected storage module 3-5, DSP moduleThe data-out bus end of 3-4 is connected with the data-out bus end of interface module 3-6; Described DSPModule 3-4 to fetus energy arithmetic is: the first step, and utilize Teager energy operator to give prominence to the height of signalEnergy area, the calculating of Teager energy operator adopts following formula:
y(n)＝x2(n-1)-x(n-1)*x(n-2)
Wherein: the fetal heartbeat signal of x (n) for receiving, y (n) is Teager energy signal; SecondStep, Teager energy signal is realized fetal heart frequency according to a preliminary estimate through auto-correlation processing; The 3rd step,The signal obtaining after auto-correlation processing, after peak estimation is processed, obtains the corresponding frequency of peak pointRate and energy; The 4th step, the energy signal that peak estimation obtains, through energy comparison processing, obtainsThe corresponding frequency of ceiling capacity, the heart rate using this frequency as fetus; Described DSP module 3-4To the algorithm of heart of fetus position be: at same plane, suppose heart of fetus position and described piezoelectricityThe coordinate position of thin film sensor is respectively (x, y) and (xi，yi), wherein i=0,1,2 ... 10, rjForSound source is to the range difference between j described piezoelectric film sensor, can be expressed as with equation:
r 0 2 = ( x - x 0 ) 2 + ( y - y 0 ) 2 r j 2 = ( x - x j ) 2 + ( y - y 0 ) 2 Δr j = r j - r 0 = cτ j
In formula, c is acoustic propagation velocity, τjFor sound-source signal to j described piezoelectric film sensor with arriveDescribed piezoelectric film sensor (x0，y0) time delay value, from hyp definition, every pair of time delayValue is determined a hyperbola, and two pairs of time delay values are determined two hyperbolas, and these two hypPosition of intersecting point is cardiac position.
Described piezoelectric film sensor 2 arrays are made up of the multi-disc MEAS LDT0-028K of company, frontPutting differential amplifier circuit 3-1 is made up of multi-disc INA326 chip; Filter circuit 3-2 is put by multi-disc computingLarge device chip LF356 forms; Mould/number conversion circuit 3-3 is made up of multi-disc AD7091R; DSP module3-4 model can be selected TMS320C674x low-power consumption Floating-point DSP; Memory module 3-5 model is optionalWith the 256MBDDR3MT41J256M8 of Micron company chip; Interface module 3-6 model can be selectedThe AD8376VGA of ADI company chip.
The central point of described piezoelectric film sensor 2 arrays and central point, the gestation of described abdominal belt 1Women's navel is aimed at, and particular location is to place a piezoelectric membrane at the central point of described abdominal belt 1Sensor, the central point arranged on left and right sides that is symmetrical in the horizontal direction described abdominal belt 1 is placed respectivelyFour piezoelectric film sensors, in the direction of navel level, adjacent described piezoelectric film sensorBetween distance be 6 centimetres, in vertical direction, the central point that is symmetrical in described abdominal belt 1 is upper and lowerTwo ends are a symmetrical piezoelectric film sensor, the piezoelectric film sensor in vertical direction placed respectivelyAnd the distance between the central point of abdominal belt 1 is 6 centimetres.
Operation principle: piezoelectric film sensor 2 arrays are monitored heart of fetus jitter, pressesThe above-mentioned signal monitoring is passed through pre-differential amplifier circuit 3-1, filter by conductive film sensor 2 arraysWave circuit 3-2, mould/number conversion circuit 3-3 send in DSP module 3-4, and DSP module 3-4 is by described tireHeart signal 4 is divided into two-way, and through nonlinear filter, processing obtains corresponding fetal heart rate monitoring on a roadAs a result, another road estimates that through time delay processing obtains heart of fetus position, and by Fetal Heart Rate and fetusCardiac position is recorded in real time in memory module 3-5, accordingly result is delivered to interface module 6 simultaneously.

Claims (2)

1. the monitoring of the array fetal rhythm based on a piezoelectric film sensor abdominal belt, it is by abdominal belt (1), multiple pressureConductive film sensor (2), testing circuit (3) composition;
It is characterized in that being respectively arranged with VELCRO (1-1), multiple piezoelectric membrane sensings on the both ends of abdominal belt (1)Device (2) is arranged on the middle part of abdominal belt (1) by arrayed; Testing circuit (3) is arranged on abdominal belt (1);Described testing circuit (3) by pre-differential amplifier circuit (3-1), filter circuit (3-2), mould/number conversion circuit (3-3),DSP module (3-4), memory module (3-5), interface module (3-6) composition; Piezoelectric film sensor (2)The signal output bus of array connects the signal input bus of pre-differential amplifier circuit (3-1), preposition differential amplificationThe signal output bus of circuit (3-1) connects the signal input bus of filter circuit (3-2), filter circuit (3-2)The signal input bus of signal output bus connection mode/number conversion circuit (3-3), mould/number conversion circuit (3-3)Data-out bus connect DSP module (3-4) data input bus (DIB), the data storage of DSP module (3-4)The data storage output input bus end of output input bus end connected storage module (3-5), DSP module (3-4)Data-out bus end be connected with the data-out bus end of interface module (3-6); Described DSP module (3-4)To fetus energy arithmetic be: the first step, utilize Teager energy operator to give prominence to the high-energy region of signal, TeagerThe calculating of energy operator adopts following formula:
y(n)＝x2(n-1)-x(n-1)*x(n-2)
Wherein: the fetal heartbeat signal of x (n) for receiving, y (n) is Teager energy signal; Second step, TeagerEnergy signal is realized fetal heart frequency according to a preliminary estimate through auto-correlation processing; The 3rd step, obtains after auto-correlation processingSignal, after peak estimation is processed, obtains the corresponding frequency of peak point and energy; The 4th step, peak estimation obtainsThe energy signal arriving, through energy comparison processing, obtains the corresponding frequency of ceiling capacity, using this frequency as fetusHeart rate; Described DSP module (3-4) to the algorithm of heart of fetus position is: at same plane, suppose the fetus heartThe coordinate position of dirty position and described piezoelectric film sensor is respectively (x, y) and (xi，yi), wherein i=0,1,210，rjFor sound source is to the range difference between j described piezoelectric film sensor, can be expressed as with equation:
r 0 2 = ( x - x 0 ) 2 + ( y - y 0 ) 2 r j 2 = ( x - x j ) 2 + ( y - y 0 ) 2 Δr j = r j - r 0 = cτ j
In formula, c is acoustic propagation velocity, τjFor sound-source signal is to j described piezoelectric film sensor and described in arrivingPiezoelectric film sensor (x0，y0) time delay value, from hyp definition, every pair of time delay value is determined a hyperbolicLine, two pairs of time delay values are determined two hyperbolas, and these two hyp position of intersecting point are cardiac position.
2. a kind of array fetal rhythm monitoring abdominal belt based on piezoelectric film sensor according to claim 1, itsBe characterised in that central point, the gestation of central point and the described abdominal belt (1) of described piezoelectric film sensor (2) arrayWomen's navel is aimed at, and particular location is to place a piezoelectric film sensor at the central point of described abdominal belt (1),The central point arranged on left and right sides that is symmetrical in the horizontal direction described abdominal belt (1) is placed respectively four piezoelectric membrane sensingsDevice, in the direction of navel level, the distance between adjacent described piezoelectric film sensor is 6 centimetres, at Vertical SquareUpwards, be symmetrical in a central point upper/lower terminal piezoelectric film sensor of symmetrical placement respectively of described abdominal belt (1),Distance between the central point of the piezoelectric film sensor in vertical direction and abdominal belt (1) is 6 centimetres.
CN201310191335.1A 2013-05-22 2013-05-22 A kind of array fetal rhythm monitoring abdominal belt based on piezoelectric film sensor Active CN103222863B (en)

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CN105167974B (en) * 2015-10-10 2017-11-21 安庆师范大学 Waist and belly pressurization instrument
CN105796095B (en) * 2016-01-22 2018-12-25 纳智源科技（唐山）有限责任公司 Fetal rhythm movement of the foetus monitoring band, fetal rhythm monitoring device of fetal movement and system
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CN111265240A (en) * 2020-02-21 2020-06-12 孙磊 Fetal heart monitor and fetal heart measuring method
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