CN207996202U - The foetus ECG monitor of pregnant woman's physical examination - Google Patents
The foetus ECG monitor of pregnant woman's physical examination Download PDFInfo
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- CN207996202U CN207996202U CN201720390949.6U CN201720390949U CN207996202U CN 207996202 U CN207996202 U CN 207996202U CN 201720390949 U CN201720390949 U CN 201720390949U CN 207996202 U CN207996202 U CN 207996202U
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Abstract
The foetus ECG monitor of pregnant woman's physical examination, belong to the fetal heart monitoring apparatus field of the antenatal physical examination of pregnant woman, which is characterized in that the electrode, computer and loud speaker that her abdominal uterus position is placed in by five are followed in series to form, it is provided in the computer, following circuit units being sequentially connected in series:Fetal ECG Signal separator component, Fetal ECG signal caching component, Fetal ECG Signal Pretreatment component, the linear transformation component and voltage-frequency, that is, frequency-voltage transformation module of conversion between Fetal ECG signal and fetal heartbeat voice signal, pick up from the Fetal ECG signal in the parent at her abdominal uterus, through analog/digital conversion, after pulse amplifying, again through signal normalization, R wave wave crest upper and lower directionss judge, remove zero or less partial noise, after signal burr, after calculating the fetal heartbeat sound signal frequencies corresponding to the Fetal ECG signal amplitude at every batch of Fetal ECG signal sampling point, classical prescription wave generation circuit forms fetal heartbeat voice signal, reprocess into the output of fetus tire sound, understand with tire sound, sound is big, the advantages that facilitating.
Description
Technical field:
The utility model belongs to pregnant woman health screening technical field more particularly to fetus tire sound monitoring technology field.
Background technology:
Fetal heart monitoring technology can help that clinician is accurate, timely obtains fetus in pregnant woman's pregnancy period or birth process
Physiological state information.There is the variation that the other problems such as fetal distress are reflected directly at Fetal Heart Rate in mother's body in fetus
On.Fetal heart monitoring method clinically mostly uses ultrasound Doppler's method at present, and this method by ultrasonic probe by being placed in parent
Abdomen and the heart for being directed at fetus identify the contraction and diastole of heart of fetus, then raise by built-in according to Doppler effect
The sound that sound device changes fetal cardiac activity, i.e. fetus tire sound play back, by this sound to the physiological and pathological of fetus
State is guarded.But there is following limitations for this method:1. it is motionless to need pregnant woman to be always maintained at during measurement,
It is unsuitable to be guarded for a long time.2. some researches show that fetus is exposed under ultrasonic radiation for a long time, after influencing whether birth
Constitution.
Invention content:
The electrocardiosignal of pregnant woman fetus can be converted directly into fetal heartbeat the purpose of this utility model is to provide a kind of
The foetus ECG monitor and a kind of hurtless measure of the pregnant woman fetus of sound and automatic send out the tire sound of fetus and audio is enhanced
Instrument, for this instrument compared with ultrasound Doppler's method, the requirement on acquisition position is relatively low and is influenced by pregnant woman's movement smaller.
The utility model is characterized in that, the foetus ECG monitor of pregnant woman's physical examination, which is characterized in that set respectively including five
Electrode in her abdominal uterus position, the computer being connected respectively with the output port of five electrodes and imitative with computer
The connected loud speaker of the output port of true fetal heartbeat voice signal, the output of the loud speaker is the tire sound of fetus, wherein five
A electrode, output is one section of primary fetal electrocardiosignal with noise and burr.
Computer contains:Following circuit units in sequential series:Fetal ECG Signal separator component, Fetal ECG signal are slow
Deposit linear transformation component between component, Fetal ECG Signal Pretreatment component, Fetal ECG signal and fetal heartbeat voice signal,
Abbreviation linear transformation component and voltage-frequency transition components, wherein:
Fetal ECG Signal separator component, input is original Fetal ECG signal described in one section, point five channels
Input, output is that one section of duration, sample frequency, sampling resolution all determine, wherein containing maximum one in electrocardiogram
The Fetal ECG signal of R waves in group's QRS complex.
Fetal ECG signal caching component, input are the one section of Fetal ECG exported through Fetal ECG Signal separator component letters
Number, output is to be divided into the Fetal ECG signal of integer batch, and the duration of every batch of Fetal ECG signal is numerically equal to every batch of
Processing time.
Fetal ECG Signal Pretreatment component, what it is along batch input is each batch of Fetal ECG signal, and what it is by batch output is
It is standardized, be less than mean value part in Fetal ECG signal and be squeezed, be removed the Fetal ECG of burr in signal
Signal.
Linear transformation component, input is to pass through separation successively, caching and pretreated each batch of Fetal ECG signal,
The virtual frequency value of output fetal heartbeat voice signal corresponding with the Fetal ECG signal amplitude on each sampled point, and
The R wave waveforms of QRS complex in Fetal ECG signal, the virtual frequency value are that Fetal ECG signal includes that R wave waveforms exist
Voltage square wave in interior all each waveforms of Fetal ECG signal in the sampling interval where maximum amplitude is fourier transformed
To each harmonic in amplitude maximum harmonic wave corresponding to frequency limits value.
Voltage-frequency transition components input the duration for the pretreated Fetal ECG signal of every batch of, sampling number, R wave waveforms
The virtual frequency value of effect duration, the discrete voltage on R wave each points and fetal heartbeat voice signal, it is a series of disconnected to export
Continuous R wave waveform voltage square-wave pulses, i.e. the fetal heartbeat voice signal, after loud speaker, final output is warp
Cross the processing time delay, and fetus tire sound square-wave pulse corresponding with each batch of Fetal ECG signal.
The effect of the utility model is, can Fetal ECG signal be converted to the output of fetus tire sound automatically, not only sound
Enhanced, and to improve the instrument that the accuracy rate of fetal heart monitoring provides automation.
Description of the drawings:
The structure diagram of Fig. 1 systems
Fig. 2 electrodes in the placement position of abdomen,For positive electrode,For reference electrode,For ground electrode.
The design sketch of Fig. 3 fetal heartbeat voice signals, Fig. 3 (a) are the Fetal ECG signal that algorithm is isolated.Fig. 3 (b)
For fetal heartbeat voice signal.
The transition diagram of Fig. 4 virtual frequencies.
Connection figure between Fig. 5 various components.
Specific implementation mode:
Computer model used in the present invention is:Asus N43S, input channel number are 7, and loudspeaker signal is:
FCSB28E-8A。
The Fetal ECG Signal separator component is one piece by analog/digital conversion circuit, computing circuit and pulse amplifying electricity
Road be sequentially connected in series it is integrated made of special chip, the special chip input terminal has 5 channels, is connected respectively with 5 electrodes, defeated
Outlet has 3 channels, is respectively used to output signal duration, sample frequency and Fetal ECG signal, is used in operation
(article of the algorithm is published in COMPUTING IN to the Fetal ECG signal separation algorithm that Maurizio Varanini are proposed
In CARDIOLOGY CONFERENCE meetings, article name is " a kind of Fetal ECG separation method of multi-step ", " A
Multi-step Approach for Non-invasive Fetal ECG Analysis".Be score in the meeting it is highest
It increases income algorithm).
The Fetal ECG signal caching component is one piece of storage chip, and input terminal has 1 channel, is believed with Fetal ECG
The Fetal ECG signal output end of number separation assembly is connected, and output end has 1 channel, and output is the tire being divided into after integer batch
Youngster's electrocardiosignal uses into section input, caches in batches, by batch access mode of the first in first out of output, every batch of Fetal ECG
Fetal ECG unicast there are one at least containing in signal.
The Fetal ECG Signal Pretreatment component, be one piece be sequentially connected in series by arithmetic unit and filter made of integrate core
Piece, input terminal have 1 channel, are connected with the output end of above-mentioned Fetal ECG signal caching component, and output end has 1 channel, use
In exporting pretreated Fetal ECG signal, the arithmetic unit is used to calculate the standardized value of Fetal ECG signal, and will
It is less than the partial inversion of mean value in Fetal ECG signal, the filter is for removing signal burr.
The linear transformation component is one piece of integrated chip made of measuring circuit and computing circuit concatenation, input terminal
There is 1 channel, for inputting pretreated Fetal ECG signal, output end there are 3 channels, for exporting the fetus filtered out
The discrete voltage of R wave of electrocardiosignal waveform, Fetal ECG signal R wave waveforms effect duration and fetal heartbeat voice signal
Virtual frequency value presets the frequency response range of human ear hearing in the component:250~1000Hz, after calculating every batch of pretreatment
Fetal ECG signal in, correspond to the collected pretreated Fetal ECG signal of each sampled point amplitude corresponding to
Fetal heartbeat voice signal virtual frequency calculation formula:
Wherein,For fetal heartbeat sound corresponding with the Fetal ECG signal R-wave amplitude adopted on sampled point i in every batch of
The virtual frequency of signal.
Indicate the amplitude of the Fetal ECG signal at the sampled point i in every batch of n.
For the average value of maximum amplitude in Fetal ECG signal R waves in each sampling window in every batch of, after measurement again
It is calculated.
For the minimum amplitude in Fetal ECG signal R waves in each sampling window in every batch of, measured value (fmax-fmin) be
The response range of human ear hearing frequencies.
The step of filtering out the R wave waveforms in Fetal ECG signal is as follows:
1. finding out Fetal ECG signal waveform all in the every batch of including R wave waveforms.
2. finding out the endpoint of left and right two of R wave waveforms, steps are as follows:
When the absolute value of the descending slope of the previous moment of zero crossing in Fetal ECG signal being 2.1. significantly less than latter
The point for carving the absolute value of the rate of rise is set as the left end point of R wave waveforms, will be under the previous moment of zero crossing in Fetal ECG signal
The point that the absolute value of drop angle rate is significantly greater than the absolute value of the later moment in time rate of rise is set as R wave waveform right endpoints, and two-end-point
Time difference be more than or equal to 20ms.
2.2. each R waves waveform is sequentially screened out.
Voltage-frequency transition components are one piece, and the integrated chip that circuit is constituted is occurred by square-wave pulse, and input terminal has 5 channels,
Wherein 2 channels are connected with 2 output ends of Fetal ECG Signal separator component, for input the duration of Fetal ECG signal with
Sample frequency, 3 channels are connected with 3 output ends of linear transformation component, for input Fetal ECG signal R wave waveforms from
Voltage value is dissipated, Fetal ECG signal R wave waveforms act on the virtual frequency value of duration and fetal heartbeat signal, output end external one
A loud speaker.The effect of the loud speaker is that the every batch of fetal heartbeat voice signal of input is converted to a batch in time to postpone
One batch processing time, sampling number be identical with the sampling interval, when a length of Fetal ECG signal R waves act on duration, amplitude is tire
The square-wave signal of youngster's ecg-r wave integrated value.
Example is supplemented below, illustrates the utility model effect:
Test data is selected from The physionet physiological signal datas library, and Fetal ECG signal total duration is 300 seconds, will
The data are divided into 75 batches, every a batch 4 seconds, and the sample frequency of signal is 250Hz, sampling resolution 16bit, Fetal ECG letter
Include 627 Fetal ECG signal R waves altogether in number, by the test to all 75 batch datas, the sensitivity of this method is
99.04%, specificity 98.35% works well.
Claims (1)
1. the foetus ECG monitor of pregnant woman's physical examination, which is characterized in that the electricity for being respectively placed in her abdominal uterus position including five
Pole, the computer being connected respectively with the output port of five electrodes and with computer emulation fetal heartbeat voice signal it is defeated
The connected loud speaker of exit port, the output of the loud speaker is the tire sound of fetus, wherein the electrode described in five, output are
One section of primary fetal electrocardiosignal with noise and burr,
Computer contains:Following circuit units in sequential series:Fetal ECG Signal separator component, Fetal ECG signal caching group
Linear transformation component between part, Fetal ECG Signal Pretreatment component, Fetal ECG signal and fetal heartbeat voice signal is (referred to as
Linear transformation component) and voltage-frequency transition components, wherein:
Fetal ECG Signal separator component, input is original Fetal ECG signal described in one section, point five channels inputs,
Output is that one section of duration, sample frequency, sampling resolution all determine, wherein containing maximum a group QRS in electrocardiogram
The Fetal ECG signal of R waves in wave group,
Fetal ECG signal caching component, input are one section of Fetal ECG signals exported through Fetal ECG Signal separator component,
Output is to be divided into the Fetal ECG signal of integer batch, and the duration of every batch of Fetal ECG signal is numerically equal to the processing of every batch of
Time,
Fetal ECG Signal Pretreatment component, what it is along batch input is each batch of Fetal ECG signal, and what it is by batch output is standard
It is changing, be less than mean value part in Fetal ECG signal and be squeezed, be removed the Fetal ECG signal of burr in signal,
Linear transformation component, input is successively by separation, caching and pretreated each batch of Fetal ECG signal, output
The virtual frequency value of fetal heartbeat voice signal corresponding with the Fetal ECG signal amplitude on each sampled point and fetus
R wave waveforms in QRS complex in electrocardiosignal, the virtual frequency value are R in the Fetal ECG signal on every batch of sampled point
Square-wave pulse on wave waveform between two neighboring discrete voltage is converted to the pulse of equal energy obtained by Fourier transformation
The maximum value of the frequency of square-wave signal,
Voltage-frequency transition components input the duration for the pretreated Fetal ECG signal of every batch of, sampling number, the effect of R wave waveforms
The virtual frequency value of duration, the discrete voltage on R wave each points and fetal heartbeat voice signal, it is a series of interrupted to export
R wave waveform voltage square-wave pulses, i.e. the fetal heartbeat voice signal, after loud speaker, final output is by institute
State processing time delay, and fetus tire sound square-wave pulse corresponding with each batch of Fetal ECG signal.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110897631A (en) * | 2019-11-22 | 2020-03-24 | 重庆医科大学 | Real-time pregnancy monitoring device and method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110897631A (en) * | 2019-11-22 | 2020-03-24 | 重庆医科大学 | Real-time pregnancy monitoring device and method |
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