CN107468232A - Fetal heart monitoring device and method - Google Patents

Fetal heart monitoring device and method Download PDF

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Publication number
CN107468232A
CN107468232A CN201710792020.0A CN201710792020A CN107468232A CN 107468232 A CN107468232 A CN 107468232A CN 201710792020 A CN201710792020 A CN 201710792020A CN 107468232 A CN107468232 A CN 107468232A
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China
Prior art keywords
probe
signal
target
probes
fetal
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Chinese (zh)
Inventor
张彧
肖进
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Suzhou Wisdom Medical Technology Co Ltd
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Suzhou Wisdom Medical Technology Co Ltd
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Priority to CN201710792020.0A priority Critical patent/CN107468232A/en
Publication of CN107468232A publication Critical patent/CN107468232A/en
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    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B5/00—Measuring for diagnostic purposes; Identification of persons
    • A61B5/02—Detecting, measuring or recording pulse, heart rate, blood pressure or blood flow; Combined pulse/heart-rate/blood pressure determination; Evaluating a cardiovascular condition not otherwise provided for, e.g. using combinations of techniques provided for in this group with electrocardiography or electroauscultation; Heart catheters for measuring blood pressure
    • A61B5/024—Detecting, measuring or recording pulse rate or heart rate
    • A61B5/02411—Detecting, measuring or recording pulse rate or heart rate of foetuses
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B5/00—Measuring for diagnostic purposes; Identification of persons
    • A61B5/02—Detecting, measuring or recording pulse, heart rate, blood pressure or blood flow; Combined pulse/heart-rate/blood pressure determination; Evaluating a cardiovascular condition not otherwise provided for, e.g. using combinations of techniques provided for in this group with electrocardiography or electroauscultation; Heart catheters for measuring blood pressure
    • A61B5/024—Detecting, measuring or recording pulse rate or heart rate
    • A61B5/02438—Detecting, measuring or recording pulse rate or heart rate with portable devices, e.g. worn by the patient
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B5/00—Measuring for diagnostic purposes; Identification of persons
    • A61B5/43—Detecting, measuring or recording for evaluating the reproductive systems
    • A61B5/4306—Detecting, measuring or recording for evaluating the reproductive systems for evaluating the female reproductive systems, e.g. gynaecological evaluations
    • A61B5/4343—Pregnancy and labour monitoring, e.g. for labour onset detection
    • A61B5/4362—Assessing foetal parameters
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B5/00—Measuring for diagnostic purposes; Identification of persons
    • A61B5/68—Arrangements of detecting, measuring or recording means, e.g. sensors, in relation to patient
    • A61B5/6801—Arrangements of detecting, measuring or recording means, e.g. sensors, in relation to patient specially adapted to be attached to or worn on the body surface
    • A61B5/6802—Sensor mounted on worn items
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B5/00—Measuring for diagnostic purposes; Identification of persons
    • A61B5/72—Signal processing specially adapted for physiological signals or for diagnostic purposes
    • A61B5/7203—Signal processing specially adapted for physiological signals or for diagnostic purposes for noise prevention, reduction or removal
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B5/00—Measuring for diagnostic purposes; Identification of persons
    • A61B5/72—Signal processing specially adapted for physiological signals or for diagnostic purposes
    • A61B5/7235—Details of waveform analysis
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B2503/00—Evaluating a particular growth phase or type of persons or animals
    • A61B2503/02—Foetus

Abstract

This application discloses a kind of fetal heart monitoring device and method.Fetal heart monitoring device includes：Array probe component, control device and fixing device.The array probe component includes at least two probes, and described to pop one's head in for gathering vibration signal, the array probe component is arranged in the fixing device；The fixing device is used to fix the array probe component with person under test；The control device is used to calculate fetal rhythm position according to the vibration signal of the probe collection, and the vibration signal gathered according to the probe of the fetal rhythm opening position obtains fetal heart rate signal.Using above-mentioned fetal heart monitoring device and method, fetal rhythm position is found without artificial, is operated without professional person using professional mode, only needs person under test's wearing just can monitor fetal rhythm, is adapted to pregnant woman's real-time continuous monitoring fetal rhythm in life.

Description

Fetal heart monitoring device and method
Technical field
The application is related to a kind of fetal heart monitoring device and method, belongs to medical instruments field.
Background technology
Fetal heart monitoring is one of most important project of antenatal exaination, can reflect fetus growth and the situation of health.One Denier finds that fetal rhythm is abnormal, should just take necessary emergency measures immediately.Fetal heart monitoring is to reducing neonatal complications and rear something lost Disease, reduce neonate's ratio of defects and perinatal mortality rate important in inhibiting.
In existing fetal heart monitoring device, some testing results are by the position of foetus, site and fetal rhythm change in location Influence is very big, and some has potential safety issue to parent and fetus, it is necessary to which professional person is examined using professional mode Survey.Therefore, existing fetal heart monitoring is all periodically to be carried out to hospital, it is necessary to which pregnant woman is registered to hospital, preengage, arranged every time Team, great inconvenience is brought to pregnant woman's life.
The content of the invention
According to the one side of the application, there is provided a kind of fetal heart monitoring device, the device is without professional person using special Industry mode operates, i.e., can continuously carry out accurate fetal heart monitoring for a long time, is adapted to pregnant woman's real-time continuous monitoring tire in life The heart.
A kind of fetal heart monitoring device, including：Array probe component, control device and fixing device；
Wherein, the array probe component includes at least two probes, described to pop one's head in for gathering vibration signal, described Array probe component is arranged in the fixing device；
The fixing device is used to fix the array probe component with person under test；
The control device is used to calculate fetal rhythm position according to the vibration signal of the probe collection, and according to the fetal rhythm The vibration signal of the probe collection of opening position obtains fetal heart rate signal.
Preferably, the control device includes：
Filtering module, the vibration signal is filtered for the frequecy characteristic according to default fetal heart rate signal and periodic feature In noise signal, obtain preprocessed signal；
Cross-correlation module, for the phse conversion broad sense cross correlation algorithm using weighting, according to the preprocessed signal meter Calculate the time difference that fetal heart rate signal reaches at least two probe；
Position module, for the spread speed according to the time difference and the default fetal heart rate signal, calculate fetal rhythm position Put；
Signaling module, the vibration signal for being gathered according to the probe of the fetal rhythm opening position obtain fetal heart rate signal.
Preferably, the cross-correlation module includes：
Target submodule, for selecting at least one set of target probe, one group of target from described at least two probes Probe includes two target probes；
Calculating sub module, for for each group of target probe, performing following handle：
The preprocessed signal of two target probes is transformed into frequency domain, obtains two frequency domain preprocessed signals respectively； The crosspower spectrum of described two frequency domain preprocessed signals is weighted, strengthens the higher frequency content of signal to noise ratio, obtains frequency domain Weighted signal；By the frequency domain weighting signal inverse transformation to time domain, broad sense cross-correlation function is obtained；Obtain the broad sense cross-correlation Time corresponding to the peak value of function, the time difference of described two target probes is reached as fetal heart rate signal.
Preferably, the target submodule is specifically used for choosing the spy of at least two targets in described at least two probes Head, it is any at least two target probe to choose two one group of target probes compositions, whole combinations is selected, will Each combination is used as one group of target probe；
Or the target submodule is specifically used for any two probe compositions one of selection in described at least two probes Group, the combination of predetermined number is selected, using each combination as one group of target probe；
Or the target submodule is specifically used for any two probe compositions one of selection in described at least two probes Group, whole combinations is selected, using each combination as one group of target probe.
Preferably, the array probe component also includes flexible substrates, and at least two probe is arranged on described soft Property substrate on, the flexible substrates connect the fixing device.
Preferably, the array probe component includes three probes, and three probes form circular array, set respectively It is placed in navel underface, navel upper left and the navel upper right of the person under test.
Preferably, the probe includes：Fetal rhythm sensor and accelerometer；The fetal rhythm sensor is used to gather the vibration Signal；The accelerometer is used for the linear acceleration for measuring the probe；
The control device is additionally operable to judge whether the probe shifts according to the linear acceleration of the probe.
Preferably, the fetal rhythm sensor includes：Microphone or the vibrating sensor for fetal heart rate signal frequency range.
According to the another aspect of the application, there is provided a kind of fetal heart monitoring method, including：
The vibration signal of probe collection in array probe component calculates fetal rhythm position；Wherein, the array Probe assembly includes at least two probes, and the array probe component is set on the securing means, and the fixing device is used for The array probe component is fixed with person under test；
Fetal heart rate signal is obtained according to the vibration signal that the probe of the fetal rhythm opening position gathers.
Preferably, the vibration signal of the probe collection in the component according to array probe, which calculates fetal rhythm position, includes：
The noise signal in the vibration signal is filtered according to the frequecy characteristic of default fetal heart rate signal and periodic feature, Obtain preprocessed signal；
Using the phse conversion broad sense cross correlation algorithm of weighting, fetal heart rate signal is calculated according to the preprocessed signal and reaches institute State the time difference of at least two probes；
According to the time difference and the spread speed of the default fetal heart rate signal, fetal rhythm position is calculated.
Preferably, the phse conversion broad sense cross correlation algorithm using weighting, tire is calculated according to the preprocessed signal The time difference that heart signal reaches at least two probe includes：
At least one set of target probe is selected from described at least two probes, one group of target probe includes two targets Probe；
For each group of target probe, following steps are performed：
The preprocessed signal of two target probes is transformed into frequency domain, obtains two frequency domain preprocessed signals respectively；
The crosspower spectrum of described two frequency domain preprocessed signals is weighted, strengthens the higher frequency content of signal to noise ratio, Obtain frequency domain weighting signal；
By the frequency domain weighting signal inverse transformation to time domain, broad sense cross-correlation function is obtained；
The time corresponding to the peak value of the broad sense cross-correlation function is obtained, described two targets are reached as fetal heart rate signal The time difference of probe.
Preferably, it is described to select at least one set of target probe to include from described at least two probes：
At least two target probes are chosen in described at least two probes, it is any at least two target probe Choose two target probes and form one group, select whole combinations, each combination is visited as one group of target Head；
Or any two one group of probe compositions of selection in described at least two probes, select the combination of predetermined number Mode, using each combination as one group of target probe；
Or any two one group of probe compositions of selection in described at least two probes, whole combinations is selected, Using each combination as one group of target probe.
Beneficial effect caused by the application energy includes：
Using array probe component, therefore can be sensitive and fetal rhythm position be positioned exactly, then again from fetal rhythm position Fetal heart rate signal is gathered, therefore without manually finding fetal rhythm position, is operated without professional person using professional mode, you can to fetal rhythm Guarded.Also, probe is fixed on person under test by fixing device, it is easy to use, person under test's wearing is only needed with regard to energy Fetal rhythm is monitored, is adapted to pregnant woman's real-time continuous monitoring fetal rhythm in life.
Further, fetal rhythm position is calculated to durations according to the vibration signal of the probe collection, and according to institute The vibration signal for stating the probe collection of fetal rhythm opening position obtains fetal heart rate signal.Therefore, if in monitoring process fetal rhythm position by Changed in fetus movement of the foetus, new fetal rhythm position can be detected in time and gather fetal heart rate signal from new fetal rhythm opening position.
Further, filtered according to the frequecy characteristic of default fetal heart rate signal and periodic feature in the vibration signal Noise signal, so as to which unrelated signal is filtered, the degree of accuracy of detection is further enhancing, wherein, unrelated signal example Such as：Parent heartbeat, maternal intracavitary noise, other external noise signals etc..Also, by using the phse conversion broad sense of weighting Cross correlation algorithm, further strengthen the frequency content that signal to noise ratio is higher in vibration signal corresponding to fetal rhythm, so as to further suppress The influence of noise, it further enhancing the degree of accuracy of detection.
Further, by setting accelerometer in probe, it is able to detect that the motion in monitoring process due to pregnant woman is led The position of the probe of cause changes, and further enhancing the degree of accuracy of detection.
Brief description of the drawings
Fig. 1 is the structural representation of the fetal heart monitoring device of the embodiment of the present invention one；
Fig. 2 is the structural representation of the control device in the fetal heart monitoring device of the embodiment of the present invention two；
Fig. 3 is the flow chart of the fetal heart monitoring method of the embodiment of the present invention three：
Fig. 4 is the flow chart of the fetal heart monitoring method of the embodiment of the present invention four.
Embodiment
The application is described in detail with reference to embodiment, but the application is not limited to these embodiments.
Fig. 1 is the structural representation of the fetal heart monitoring device of the embodiment of the present invention one.As shown in figure 1, the fetal heart monitoring fills Put including：Array probe component, control device 2 and fixing device 3.
Wherein, the array probe component includes at least two probes 11, and the probe 11 is used to gather vibration signal, The array probe component is arranged in the fixing device 3.
The fixing device 3 is used to fix the array probe component with person under test.
The control device 2 is used to calculate fetal rhythm position according to the vibration signal of the probe collection, and according to the tire The vibration signal that the probe 11 of heart opening position gathers obtains fetal heart rate signal.
In the embodiment of the present invention one, using array probe component, therefore can be sensitive and fetal rhythm position be positioned exactly Put, then again from fetal rhythm station acquisition fetal heart rate signal, therefore without manually finding fetal rhythm position, without professional person using specialty Mode is operated, you can fetal rhythm is guarded.Also, probe is fixed on person under test by fixing device, it is easy to use, Only need person under test's wearing just can monitor fetal rhythm, be adapted to pregnant woman's real-time continuous monitoring fetal rhythm in life.
Preferably, fetal rhythm position is calculated to the durations of control device 2 according to the vibration signal of the probe collection, and The vibration signal gathered according to the probe 11 of the fetal rhythm opening position obtains fetal heart rate signal.Therefore, if in monitoring process tire Because fetus movement of the foetus changes, control device 2 can detect new fetal rhythm position in time and from new fetal rhythm position for heart position Put place's collection fetal heart rate signal.
Fig. 2 is the structural representation of the control device in the fetal heart monitoring device of the embodiment of the present invention two.The present invention is implemented The fetal heart monitoring device of example two is consistent with the structure of the fetal heart monitoring device of the embodiment of the present invention one, in the embodiment of the present invention two In, the control device 2 in fetal heart monitoring device is specifically described.As shown in Fig. 2 the control dress in the fetal heart monitoring device Putting 2 includes：Filtering module 21, cross-correlation module 22, position module 23 and signaling module 24.
Wherein, filtering module 21 is used to shake according to the filtering of the frequecy characteristic and periodic feature of default fetal heart rate signal Noise signal in dynamic signal, obtains preprocessed signal.
Cross-correlation module 22 is used for the phse conversion broad sense cross correlation algorithm using weighting, according to the preprocessed signal meter Calculate the time difference that fetal heart rate signal reaches at least two probe.Wherein, the phse conversion broad sense cross correlation algorithm of weighting utilizes Same fetal rhythm vibration source is collected the principle that signal has correlation by different probes.
Position module 23 is used for the spread speed according to the time difference and the default fetal heart rate signal, calculates fetal rhythm position Put.
The vibration signal that signaling module 24 is used to be gathered according to the probe 11 of the fetal rhythm opening position obtains fetal heart rate signal.
Further, above-mentioned cross-correlation module 22 includes：Target submodule 221 and calculating sub module 222.
Wherein, target submodule 221 is used to select at least one set of target probe from described at least two probes 11, described One group of target probe includes two target probes.
Calculating sub module 222 is used to be directed to each group of target probe, performs following handle：
The preprocessed signal of two target probes is transformed into frequency domain, obtains two frequency domain preprocessed signals respectively； The crosspower spectrum of described two frequency domain preprocessed signals is weighted, strengthens the higher frequency content of signal to noise ratio, obtains frequency domain Weighted signal；By the frequency domain weighting signal inverse transformation to time domain, broad sense cross-correlation function is obtained；Obtain the broad sense cross-correlation Time corresponding to the peak value of function, the time difference of described two target probes is reached as fetal heart rate signal.
Further, the target submodule 221 is specifically used for choosing at least two in described at least two probes 11 Target probe, it is any at least two target probe to choose two one group of target probes compositions, select whole combinations Mode, using each combination as one group of target probe.Or the target submodule 221 is specifically used for described Any combination chosen two one group of compositions of probe 11, select predetermined number at least two probes 11, by each group Conjunction mode is used as one group of target probe.Or the target submodule 221 is specifically used in described at least two probes 11 It is any to choose two one group of compositions of probe 11, whole combinations is selected, using each combination as one group of target Probe.
In the embodiment of the present invention two, using array probe component, therefore can be sensitive and fetal rhythm position be positioned exactly Put, then again from fetal rhythm station acquisition fetal heart rate signal, detection sensitivity is high, accuracy is high, therefore without manually finding fetal rhythm position Put, operated without professional person using professional mode, you can fetal rhythm is guarded.Also, it is solid to be popped one's head in by fixing device It is scheduled on person under test, it is safe and convenient to use, only need person under test's wearing just can monitor fetal rhythm, be adapted to pregnant woman to connect in real time in life Continuous monitoring fetal rhythm.
Further, filtering module 21 shakes according to the filtering of the frequecy characteristic and periodic feature of default fetal heart rate signal Noise signal in dynamic signal, so as to which unrelated signal is filtered, further enhancing the degree of accuracy of detection, wherein, nothing The signal of pass is for example：Parent heartbeat, maternal intracavitary noise, other external noise signals etc..
Further, cross-correlation module 22 is further strengthened by using the phse conversion broad sense cross correlation algorithm of weighting The higher frequency content of signal to noise ratio in vibration signal corresponding to fetal rhythm, so as to further suppress the influence of noise, further enhance The degree of accuracy of detection.
On the basis of the above-mentioned technical proposal of the embodiment of the present invention one and embodiment two, in a kind of concrete implementation mode In, the control device 2 includes power supply, is that each probe 11 in the array probe component is powered.
On the basis of the above-mentioned technical proposal of the embodiment of the present invention one and embodiment two, in a kind of concrete implementation mode In, each probe 11 in the array probe component is connected by physical connection with control device 2 respectively.Passed to reduce Defeated interference, probe 11 use pulse density modulated (Pulse when transmitting vibration signal corresponding to fetal heart rate signal to control device 2 Density Modulation, abbreviation PDM) form.It is different in order to precisely obtain the time difference that fetal heart rate signal reaches different probes The PDM clocks of probe must be synchronous, and the signal of triggering collection also must be synchronous, and data need individual transmission.
On the basis of the above-mentioned technical proposal of the embodiment of the present invention one and embodiment two, in a kind of concrete implementation mode In, the array probe component also includes flexible substrates 12, and at least two probe 11 is arranged on the flexible substrates 12 On, the flexible substrates 12 connect the fixing device 3.
On the basis of the above-mentioned technical proposal of the embodiment of the present invention one and embodiment two, in a kind of concrete implementation mode In, the fixing device 3 is specifically waistband, and described waistband can be worn on person under test's waist.
On the basis of the above-mentioned technical proposal of the embodiment of the present invention one and embodiment two, in a kind of concrete implementation mode In, the array probe component includes three probes 11, and three probes 11 form circular array, are respectively arranged at described Navel underface, navel upper left and the navel upper right of person under test.Wherein, using circular array, can cover as far as possible The possible range of lid fetal rhythm.Using three probes 11, the position of fetal rhythm can either be accurately determined, and can enough effectively controls into This.One of probe 11 is arranged at immediately below navel, is located proximate to pregnant early stage fetal rhythm most likely location, therefore can gather To stronger fetal heart rate signal.Spacing between above three probe 11 needs to control in suitable interval, and spacing too conference is from fetal rhythm Position farther out, cause the signal of collection weaker, spacing is too small to be caused to the reduction of the positioning precision of fetal rhythm position.Have in one kind In body implementation, preferably spacing is between 6 to 10 centimetres between above three probe 11.
On the basis of the above-mentioned technical proposal of the embodiment of the present invention one and embodiment two, in a kind of concrete implementation mode In, the probe 11 includes：Fetal rhythm sensor and accelerometer.Wherein, the fetal rhythm sensor is used to gather the vibration signal. The accelerometer is used for the linear acceleration for measuring the probe 11.The control device 2 is additionally operable to the line according to the probe 11 Acceleration judges whether the probe 11 shifts.Therefore, if because the motion of pregnant woman causes the position of probe 11 in monitoring process Put and change, the linear acceleration for the probe 11 that control device 2 can measure according to accelerometer detects that the position of probe 11 becomes Change, for example, control device 2 can detect the change of accelerometer relative value in different probes 11, so as to detect the position of probe 11 Change is put, thus uses the fetal heart monitoring device, the change of probe 11 can be corrected to fetal rhythm continuous monitoring by repositioning Influence.
On the basis of the above-mentioned technical proposal of the embodiment of the present invention one and embodiment two, in a kind of concrete implementation mode In, the fetal rhythm sensor can use microphone, or, the fetal rhythm sensor can also use special device, for example, pin To the vibrating sensor of fetal heart rate signal frequency range.
Fig. 3 is the flow chart of the fetal heart monitoring method of the embodiment of the present invention three.As shown in figure 3, this method includes following step Suddenly：
Step 301：The vibration signal of probe collection in array probe component calculates fetal rhythm position.
Wherein, the array probe component includes at least two probes, and the array probe component is arranged on fixation On device, the fixing device is used to fix the array probe component with person under test.
Step 302：Fetal heart rate signal is obtained according to the vibration signal that the probe of the fetal rhythm opening position gathers.
In the embodiment of the present invention three, using array probe component, therefore can be sensitive and fetal rhythm position be positioned exactly Put, then again from fetal rhythm station acquisition fetal heart rate signal, therefore without manually finding fetal rhythm position, without professional person using specialty Mode is operated, you can fetal rhythm is guarded.Also, it will be popped one's head in admittedly by fixing device using the fetal heart monitoring device of the method It is scheduled on person under test, it is easy to use, only need person under test's wearing just can monitor fetal rhythm, be adapted to pregnant woman's real-time continuous prison in life Survey fetal rhythm.
Fig. 4 is the flow chart of the fetal heart monitoring method of the embodiment of the present invention four.As shown in figure 4, this method includes following step Suddenly：
First, the vibration signal of the probe collection in array probe component calculates fetal rhythm position.Wherein, the battle array Column probe assembly includes at least two probes, and the array probe component is set on the securing means, the fixing device For the array probe component to be fixed with person under test.Specifically, the process may comprise steps of 401 to step 403。
Step 401：According to the noise in the frequecy characteristic of default fetal heart rate signal and periodic feature filter vibration signal Signal, obtain preprocessed signal.
Step 402：Using the phse conversion broad sense cross correlation algorithm of weighting, fetal rhythm letter is calculated according to the preprocessed signal Number reach it is described at least two probe time differences.
In this step, one and step 2 specifically be may comprise steps of.
Step 1：At least one set of target probe is selected from described at least two probes, one group of target probe includes Two target probes.Specifically chosen method can use：At least two target probes are chosen in described at least two probes, It is any at least two target probe to choose two one group of target probes compositions, whole combinations is selected, will be each Kind combination is used as one group of target probe.Or specifically chosen method can use：Appoint in described at least two probes Meaning chooses two one group of probe compositions, the combination of predetermined number is selected, using each combination as one group of target Probe.Or specifically chosen method can use：It is any in described at least two probes to choose two one group of probe compositions, Whole combinations is selected, using each combination as one group of target probe.
Step 2：For each group of target probe, following steps are performed.First, by the pre- place of two target probes Reason signal transforms to frequency domain, obtains two frequency domain preprocessed signals respectively；Then, to the mutual of described two frequency domain preprocessed signals Power spectrum is weighted, and is strengthened the higher frequency content of signal to noise ratio, is obtained frequency domain weighting signal；Subsequently, the frequency domain is added Signal inverse transformation is weighed to time domain, obtains broad sense cross-correlation function；Finally, corresponding to the peak value for obtaining the broad sense cross-correlation function Time, time differences of described two target probes is reached as fetal heart rate signal.Step 2 is formulated as：
Rx1x2(t)=Ψ12(ω)Gx1x2(ω)e-jωπdω
Wherein, Rx1x2(t) broad sense cross-correlation function is represented, x1 and x2 represent to pre-process corresponding to two target probes respectively Signal, Gx1x2(ω) is x1 and x2 crosspower spectrum, Ψ12(ω) is broad sense cross-correlation weighting function.
Step 403：According to the time difference and the spread speed of the default fetal heart rate signal, fetal rhythm position is calculated.
Step 404：Fetal heart rate signal is obtained according to the vibration signal that the probe of the fetal rhythm opening position gathers.
Preferably, above-mentioned steps 401 to step 404 durations are carried out.Therefore, if in monitoring process fetal rhythm position Put because fetus movement of the foetus changes, new fetal rhythm position can be detected in time and believed from new fetal rhythm opening position collection fetal rhythm Number.
In the embodiment of the present invention four, using array probe component, therefore can be sensitive and fetal rhythm position be positioned exactly Put, then again from fetal rhythm station acquisition fetal heart rate signal, detection sensitivity is high, accuracy is high, therefore without manually finding fetal rhythm position Put, operated without professional person using professional mode, you can fetal rhythm is guarded.Also, using the fetal heart monitoring of the method Probe is fixed on person under test by device by fixing device, safe and convenient to use, only needs person under test's wearing with regard to that can monitor tire The heart, it is adapted to pregnant woman's real-time continuous monitoring fetal rhythm in life.
Further, filtered according to the frequecy characteristic of default fetal heart rate signal and periodic feature in the vibration signal Noise signal, so as to which unrelated signal is filtered, the degree of accuracy of detection is further enhancing, wherein, unrelated signal example Such as：Parent heartbeat, maternal intracavitary noise, other external noise signals etc..
Further, by using the phse conversion broad sense cross correlation algorithm of weighting, further strengthen shaking corresponding to fetal rhythm The higher frequency content of signal to noise ratio, so as to further suppress the influence of noise, further enhancing the accurate of detection in dynamic signal Degree.
It is described above, only it is several embodiments of the application, any type of limitation is not done to the application, although this Shen Please with preferred embodiment disclose as above, but and be not used to limit the application, any person skilled in the art, do not taking off In the range of technical scheme, make a little variation using the technology contents of the disclosure above or modification is equal to Case study on implementation is imitated, is belonged in the range of technical scheme.

Claims (12)

  1. A kind of 1. fetal heart monitoring device, it is characterised in that including：Array probe component, control device and fixing device；
    Wherein, the array probe component includes at least two probes, described to pop one's head in for gathering vibration signal, the array Formula probe assembly is arranged in the fixing device；
    The fixing device is used to fix the array probe component with person under test；
    The control device is used to calculate fetal rhythm position according to the vibration signal of the probe collection, and according to the fetal rhythm position The vibration signal of the probe collection at place obtains fetal heart rate signal.
  2. 2. device according to claim 1, it is characterised in that the control device includes：
    Filtering module, filtered for the frequecy characteristic according to default fetal heart rate signal and periodic feature in the vibration signal Noise signal, obtain preprocessed signal；
    Cross-correlation module, for the phse conversion broad sense cross correlation algorithm using weighting, tire is calculated according to the preprocessed signal Heart signal reaches the time difference of at least two probe；
    Position module, for the spread speed according to the time difference and the default fetal heart rate signal, calculate fetal rhythm position；
    Signaling module, the vibration signal for being gathered according to the probe of the fetal rhythm opening position obtain fetal heart rate signal.
  3. 3. device according to claim 2, it is characterised in that the cross-correlation module includes：
    Target submodule, for selecting at least one set of target probe, one group of target probe from described at least two probes Including two target probes；
    Calculating sub module, for for each group of target probe, performing following handle：
    The preprocessed signal of two target probes is transformed into frequency domain, obtains two frequency domain preprocessed signals respectively；To institute The crosspower spectrum for stating two frequency domain preprocessed signals is weighted, and is strengthened the higher frequency content of signal to noise ratio, is obtained frequency domain weighting Signal；By the frequency domain weighting signal inverse transformation to time domain, broad sense cross-correlation function is obtained；Obtain the broad sense cross-correlation function Peak value corresponding to time, time differences of described two target probes is reached as fetal heart rate signal.
  4. 4. device according to claim 3, it is characterised in that
    The target submodule be specifically used for described at least two probe in choose at least two target probes, it is described at least It is any in two target probes to choose two one group of target probes compositions, whole combinations is selected, by each combination side Formula is used as one group of target probe；
    Or the target submodule is specifically used for any two one group of probe compositions of selection in described at least two probes, The combination of predetermined number is selected, using each combination as one group of target probe；
    Or the target submodule is specifically used for any two one group of probe compositions of selection in described at least two probes, Whole combinations is selected, using each combination as one group of target probe.
  5. 5. device as claimed in any of claims 1 to 4, it is characterised in that
    The array probe component also includes flexible substrates, and at least two probe is arranged in the flexible substrates, institute State flexible substrates and connect the fixing device.
  6. 6. device as claimed in any of claims 1 to 4, it is characterised in that
    The array probe component includes three probes, and three probes form circular array, are respectively arranged at described treat Navel underface, navel upper left and the navel upper right of survey person.
  7. 7. device as claimed in any of claims 1 to 4, it is characterised in that
    The probe includes：Fetal rhythm sensor and accelerometer；The fetal rhythm sensor is used to gather the vibration signal；It is described to add Speed counts the linear acceleration for measuring the probe；
    The control device is additionally operable to judge whether the probe shifts according to the linear acceleration of the probe.
  8. 8. device according to claim 7, it is characterised in that
    The fetal rhythm sensor includes：Microphone or the vibrating sensor for fetal heart rate signal frequency range.
  9. A kind of 9. fetal heart monitoring method, it is characterised in that including：
    The vibration signal of probe collection in array probe component calculates fetal rhythm position；Wherein, the array probe Component includes at least two probes, and the array probe component is set on the securing means, and the fixing device is used for institute Array probe component is stated to fix with person under test；
    Fetal heart rate signal is obtained according to the vibration signal that the probe of the fetal rhythm opening position gathers.
  10. 10. according to the method for claim 9, it is characterised in that the probe collection in the component according to array probe Vibration signal calculate fetal rhythm position and include：
    The noise signal in the vibration signal is filtered according to the frequecy characteristic of default fetal heart rate signal and periodic feature, is obtained Preprocessed signal；
    Using the phse conversion broad sense cross correlation algorithm of weighting, according to the preprocessed signal calculate fetal heart rate signal reach described in extremely The time difference of few two probes；
    According to the time difference and the spread speed of the default fetal heart rate signal, fetal rhythm position is calculated.
  11. 11. according to the method for claim 10, it is characterised in that the phse conversion broad sense cross-correlation using weighting is calculated Method, the time differences of fetal heart rate signal arrival at least two probe are calculated according to the preprocessed signal to be included：
    At least one set of target probe is selected from described at least two probes, one group of target probe includes two targets and visited Head；
    For each group of target probe, following steps are performed：
    The preprocessed signal of two target probes is transformed into frequency domain, obtains two frequency domain preprocessed signals respectively；
    The crosspower spectrum of described two frequency domain preprocessed signals is weighted, strengthens the higher frequency content of signal to noise ratio, obtains Frequency domain weighting signal；
    By the frequency domain weighting signal inverse transformation to time domain, broad sense cross-correlation function is obtained；
    The time corresponding to the peak value of the broad sense cross-correlation function is obtained, described two target probes are reached as fetal heart rate signal Time difference.
  12. 12. according to the method for claim 11, it is characterised in that described to select at least one from described at least two probes Group target probe includes：
    At least two target probes are chosen in described at least two probes, are arbitrarily chosen at least two target probe Two target probes form one group, whole combinations are selected, using each combination as one group of target probe；
    Or any combination chosen two one group of probe compositions, select predetermined number in described at least two probes, Using each combination as one group of target probe；
    Or any two one group of probe compositions of selection in described at least two probes, whole combinations is selected, will be every A kind of combination is used as one group of target probe.
CN201710792020.0A 2017-09-05 2017-09-05 Fetal heart monitoring device and method Pending CN107468232A (en)

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Application publication date: 20171215