阅读说明：本技术 基于光纤传感的胎心监护托腹带 (Fetal heart monitoring and supporting abdominal belt based on optical fiber sensing ) 是由 李政颖 赵涛 詹婧 陈可为 于 2021-08-09 设计创作，主要内容包括：本发明公开了一种基于光纤传感的胎心监护托腹带,它的每个预弯曲的光纤传感单元均固定于对应的振动敏感膜上,每个预弯曲的光纤传感单元与对应的振动敏感膜内嵌于托腹带本体的织物中；光源用于向每个预弯曲的光纤传感单元发送激光,光信号接收组件用于接收经过各个预弯曲的光纤传感单元时被振动信号调制的激光信号,并将被振动信号调制的激光信号转换为对应的多路带有生理特征信息的电信号；信号处理与分析模块用于分离出胎儿心跳信息。本发明通过基于光纤高灵敏度振动传感技术感知由胎儿心跳、胎动引起的振动信号,通过多路信号的处理分析实现连续实时监测胎儿健康状态。(The invention discloses a fetal heart monitoring abdominal supporting belt based on optical fiber sensing, wherein each pre-bent optical fiber sensing unit is fixed on a corresponding vibration sensitive membrane, and each pre-bent optical fiber sensing unit and the corresponding vibration sensitive membrane are embedded in a fabric of an abdominal supporting belt body; the optical signal receiving assembly is used for receiving laser signals modulated by vibration signals when passing through the pre-bent optical fiber sensing units and converting the laser signals modulated by the vibration signals into corresponding multi-channel electric signals with physiological characteristic information; the signal processing and analyzing module is used for separating fetal heartbeat information. The invention senses the vibration signals caused by the heartbeat and fetal movement of the fetus by the optical fiber-based high-sensitivity vibration sensing technology, and realizes continuous real-time monitoring of the health state of the fetus by processing and analyzing multiple paths of signals.)

1. The utility model provides a child heart prison holds in palm binder based on optical fiber sensing which characterized in that: the abdominal belt comprises an abdominal belt body (1), an optical fiber sensing array (2), a light source (3), an optical signal receiving assembly (4) and a signal processing and analyzing module (5), wherein the optical fiber sensing array (2) comprises a plurality of pre-bent optical fiber sensing units (2.1), each pre-bent optical fiber sensing unit (2.1) is fixed on a corresponding vibration sensitive film (2.3), and each pre-bent optical fiber sensing unit (2.1) and the corresponding vibration sensitive film (2.3) are embedded in a fabric of the abdominal belt body (1);

the light source (3) is used for sending laser to each pre-bent optical fiber sensing unit (2.1), and the optical signal receiving assembly (4) is used for receiving the laser signal modulated by the vibration signal when passing through each pre-bent optical fiber sensing unit (2.1) and converting the laser signal modulated by the vibration signal into corresponding multi-channel electric signals with physiological characteristic information;

the signal processing and analyzing module (5) is used for preprocessing a plurality of paths of electric signals with physiological characteristic information to obtain a plurality of corresponding paths of mixed signals containing the heartbeats of the pregnant woman and the fetus, the signal processing and analyzing module (5) respectively carries out independent component analysis on the plurality of paths of mixed signals containing the heartbeats of the pregnant woman and the fetus by adopting a rapid independent component analysis algorithm, and fetal heartbeat information is separated from the plurality of paths of mixed signals containing the heartbeats of the pregnant woman and the fetus.

2. The fetal heart monitoring bellyband based on optical fiber sensing of claim 1, wherein: the pre-bent optical fiber sensing units (2.1) in the abdomen supporting belt body (1) are arranged on the abdomen and used for sensing vibration signals of different parts of the abdomen.

3. The fetal heart monitoring bellyband based on optical fiber sensing of claim 1, wherein: the pre-bent optical fiber sensing unit (2.1) is formed by pressing a hard pressing line (2.2) with an optical fiber.

4. The fetal heart monitoring bellyband based on optical fiber sensing of claim 1, wherein: the vibration sensitive film (2.3) is made of PVC material with the thickness of 0.1-0.3 mm, and the hard pressing line (2.2) is made of plastic optical fiber with the diameter of 0.5-1.5 mm.

5. The fetal heart monitoring bellyband based on optical fiber sensing of claim 1, wherein: the signal processing and analyzing module (5) is used for carrying out sectional sliding window processing on the multi-channel electric signals with the physiological characteristic information, carrying out energy calculation on the electric signals with the physiological characteristic information in the window, judging whether the electric signals are fetal movement information according to the energy calculation result, if the electric signals are fetal movement information, marking the fetal movement and returning to a sliding data window; and (4) carrying out Bessel filtering on the non-fetal movement information to remove baseline noise and realize preprocessing.

6. The fetal heart monitoring bellyband based on optical fiber sensing of claim 1, wherein: the signal processing and analyzing module (5) is used for respectively carrying out independent component analysis on the multipath mixed signals containing the heartbeats of the pregnant woman and the fetus, and the specific process of obtaining the instantaneous heart rate and the average heart rate of the fetus is as follows:

the fetal heartbeat information is subjected to autocorrelation calculation, and the time interval between two adjacent fetal heartbeats is obtained by adopting a peak value detection method, so that the instantaneous heart rate and the average heart rate of the fetus can be calculated.

7. The fetal heart monitoring bellyband based on optical fiber sensing of claim 1, wherein: the signal processing and analyzing module (5) is used for performing signal quality analysis based on vibration signal intensity on each mixed signal containing heartbeat of the pregnant woman and the fetus by utilizing autocorrelation operation, obtaining corresponding signal quality scores of all the mixed signals, comparing the signal quality scores of all the mixed signals with a preset threshold value respectively, reserving the mixed signals corresponding to the signal quality scores reaching the preset threshold value, performing subsequent body position judgment on the fetus, and deleting the mixed signals corresponding to the signal quality scores which do not reach the preset threshold value.

8. The fetal heart monitoring bellyband based on optical fiber sensing of claim 1, wherein: the signal processing and analyzing module (5) is used for carrying out signal quality analysis based on the intensity of the vibration signals on each mixed signal containing the heartbeat of the pregnant woman and the fetus by utilizing autocorrelation operation, obtaining the signal quality scores of the corresponding mixed signals, and judging the body position of the fetus by utilizing the signal quality score results of the mixed signals and the distribution positions of the pre-bent optical fiber sensing units (2.1).

9. The fetal heart monitoring bellyband based on optical fiber sensing of claim 1, wherein: the side edge belt (1.1) of the abdomen supporting belt body (1) is of an elastic belt structure, so that the optical fiber sensing array (2) can be tightly attached to the abdomen of a pregnant woman and support the abdomen; the side belt tail end (1.2) of the abdomen supporting belt body (1) adopts a magic tape design.

Technical Field

The invention relates to the technical field of fetal heart monitoring, in particular to a fetal heart monitoring abdominal supporting belt based on optical fiber sensing.

Background

In prenatal health diagnosis of a fetus, fetal heart monitoring is an important means for monitoring the health of the fetus. Generally, perinatal fetal heart monitoring requires that a pregnant woman is monitored in a hospital, the traditional monitoring mode is limited by time, the pregnant woman can only be monitored within a set time, but the timed monitoring only can reflect the condition of a fetus when the pregnant woman receives monitoring, and continuous monitoring can not be carried out as required or day by day, so that the acute hypoxia or abnormal health condition caused by intrauterine distress can be missed; on the other hand, the pregnant woman is limited by the space, the pregnant woman needs to go to the hospital to receive monitoring at a fixed point, dynamic continuous monitoring can not be carried out at any time and any place according to the requirements, and the abnormal health condition of the fetus is difficult to find in time or in early stage. Therefore, the traditional fetal heart monitoring mode has difficulty in meeting the expectations and requirements of the majority of pregnant women for the daily monitoring of fetal health.

The current household intelligent fetal heart monitor facilitates the monitoring of the health condition of the fetus by the pregnant woman through fetal heart sound detection. However, such instruments need manual operation, can only carry out single measurement, and cannot realize long-time continuous monitoring; meanwhile, the measurement object is fetal heart sound, which can only auscultate short-time heart rate, cannot monitor fetal heart rate change for a long time, cannot determine whether the fetus is anoxic, cannot monitor fetal movement, and cannot realize the fetal health condition monitoring function. Therefore, a household device capable of continuously and simultaneously monitoring fetal heart, fetal movement and other functions is needed, and remote fetal health condition assessment is achieved by combining the current internet of things technology.

Disclosure of Invention

The invention aims to provide an abdominal supporting belt for fetal heart monitoring based on optical fiber sensing. The invention senses the vibration signals caused by the heartbeat and fetal movement of the fetus by the optical fiber-based high-sensitivity vibration sensing technology, and realizes continuous real-time monitoring of the health state of the fetus by processing and analyzing multiple paths of signals.

In order to achieve the purpose, the fetal heart monitoring abdominal supporting belt based on optical fiber sensing comprises an abdominal supporting belt body, an optical fiber sensing array, a light source, an optical signal receiving component and a signal processing and analyzing module, wherein the optical fiber sensing array comprises a plurality of pre-bent optical fiber sensing units, each pre-bent optical fiber sensing unit is fixed on a corresponding vibration sensitive membrane, and each pre-bent optical fiber sensing unit and the corresponding vibration sensitive membrane are embedded in a fabric of the abdominal supporting belt body;

the optical signal receiving assembly is used for receiving laser signals modulated by vibration signals when passing through the pre-bent optical fiber sensing units and converting the laser signals modulated by the vibration signals into corresponding multi-channel electric signals with physiological characteristic information;

the signal processing and analyzing module is used for preprocessing a plurality of paths of electric signals with physiological characteristic information to obtain a plurality of corresponding paths of mixed signals containing the heartbeats of the pregnant woman and the fetus, and the signal processing and analyzing module is used for respectively carrying out independent component analysis on the plurality of paths of mixed signals containing the heartbeats of the pregnant woman and the fetus by adopting a rapid independent component analysis algorithm and separating out the heartbeat information of the fetus from the plurality of paths of mixed signals containing the heartbeats of the pregnant woman and the fetus.

The working principle of the invention is as follows:

the heart beat and fetal movement of the fetus can be characterized in the abdomen of the pregnant woman in the form of mechanical vibrations. Therefore, the heartbeat and fetal movement of the fetus can be obtained by measuring the vibration signals of the abdomen of the pregnant woman. However, the respiratory and heartbeat vibration information of the pregnant woman is also presented in the abdomen in a vibration mode, so that the vibration signal measured by the abdomen is a mixed signal containing the vital sign signals of the mother and the baby, and is difficult to separate. Meanwhile, the fetus after the gestational period changes the posture in the abdomen, so that high-quality fetal heart signals cannot be always monitored at a specific position of the abdomen. Therefore, the high-sensitivity vibration sensors are distributed around the approximate position of the fetus, so that the method is not only beneficial to screening and analyzing the sensing signals with high monitoring signal quality, but also beneficial to effectively separating the vital sign signals of the mother and the baby by adopting an independent component analysis method.

The invention has the beneficial effects that:

1. according to the invention, the fetal heart is monitored by a method for detecting weak vibration, the fetal heart does not need to be contacted with the skin, passive monitoring is realized, and the experience feeling is good;

2. the invention adopts the optical fiber sensor, the sensor is intrinsically flexible and uncharged, and can be conveniently and flexibly embedded into the abdomen supporting belt body, thereby increasing the use convenience;

3. the optical fiber sensor is safe, environment-friendly and radiation-free, can monitor fetal movement for a long time, and does not influence fetal development.

4. According to the invention, a plurality of independent sensors distributed at different positions are adopted for simultaneous detection, so that the vital sign signals of the mother and the baby can be effectively separated, and the reliability is high;

5. the invention not only can monitor fetal heart and fetal movement in real time, but also can judge the body position of the fetus according to the signal intensity and quality of the sensors at different positions, thereby recording the activity condition of the fetus;

6. the sensing device has simple structure, is easy to manufacture and is suitable for industrial production;

the fetal heart rate monitoring system has the advantages of simple structure, easiness in implementation, low manufacturing cost, reliability in operation, high sensitivity, real-time detection and the like, and can be applied to daily fetal heart rate monitoring scenes.

Drawings

FIG. 1 is a schematic view of the overall structure of the present invention;

FIG. 2 is a functional block diagram of the present invention;

FIG. 3 is a schematic structural diagram of a pre-bent optical fiber sensing unit according to the present invention;

fig. 4 is a flow chart of the signal processing and analyzing process of the present invention.

The device comprises a belly supporting belt body 1, a side belt 1.1, a side belt tail end 1.2, an optical fiber sensing array 2, a pre-bent optical fiber sensing unit 2.1, a hard pressing line 2.2, a vibration sensitive film 2.3, a light source 3, an optical signal receiving component 4 and a signal processing and analyzing module 5.

Detailed Description

The invention is described in further detail below with reference to the following figures and specific examples:

as shown in fig. 1 to 4, the fetal heart monitoring abdomen supporting belt based on optical fiber sensing comprises an abdomen supporting belt body 1, an optical fiber sensing array 2, a light source 3, an optical signal receiving component 4 and a signal processing and analyzing module 5, wherein the optical fiber sensing array 2 comprises a plurality of pre-bent optical fiber sensing units 2.1 (6 optical fiber sensing units are adopted in the embodiment), each pre-bent optical fiber sensing unit 2.1 is fixed on a corresponding vibration sensitive membrane 2.3, each pre-bent optical fiber sensing unit 2.1 and the corresponding vibration sensitive membrane 2.3 are embedded in a fabric of the abdomen supporting belt body 1, the abdomen supporting belt body 1 is used for supporting the abdomen of a pregnant woman and helping the pregnant woman to keep a correct posture, the plurality of pre-bent optical fiber sensing units 2.1 are respectively arranged on two sides of the abdomen to sense vibration signals of different parts of the abdomen, the pre-bent optical fiber sensing units 2.1 and the vibration sensitive membrane 2.3 are both made of flexible, environment-friendly and non-radiative materials, the two materials can be organically fused with the abdomen supporting belt body, and can be used for monitoring weak vibration caused by fetal physiological activity;

the light source 3 is used for sending laser (preferably laser with wavelength of 1550 nm) to each pre-bent optical fiber sensing unit 2.1, the optical signal receiving assembly 4 is used for receiving laser signals modulated by vibration signals when passing through each pre-bent optical fiber sensing unit 2.1 (the bent optical fiber causes partial optical power leakage due to bending, when vibration is encountered, the bent part changes the bending shape of the optical fiber along with the vibration signals, and further influences the intensity of the optical leakage in the optical fiber, that is, the intensity of optical signals transmitted in the bent optical fiber is modulated by the vibration signals), and converts the laser signals modulated by the vibration signals into corresponding multi-channel electrical signals with physiological characteristic information (since physiological activities such as pregnant woman respiration, pulse and fetal heartbeat activity are expressed in the abdominal region of the pregnant woman in a vibration mode, from the signal intensity, the pregnant woman respiration signals are strongest, and the fetal heartbeat is inferior, the pulse signal of the pregnant woman is relatively weak, so that the optical fiber vibration sensing unit is attached to the abdomen of the pregnant woman, and the vibration signal caused by the physiological activities of the pregnant woman and a fetus can be effectively sensed, namely the sensing signal contains the physiological characteristic signal of the mother and the baby);

the signal processing and analyzing module 5 is used for preprocessing the plurality of paths of electric signals with physiological characteristic information to obtain corresponding plurality of paths of mixed signals containing the heartbeat of the pregnant woman and the heartbeat of the fetus, because the number of the sensors for acquiring signals is larger than the number of the signal sources (the heartbeats or the pulses of the pregnant woman and the fetus), the signal processing and analyzing module 5 respectively carries out independent component analysis on the multi-channel mixed signals containing the heartbeats of the pregnant woman and the fetus by using a fast independent component analysis algorithm (FastICA), the method comprises the steps of removing the mean value of multi-channel mixed signals, spheroidizing, whitening to obtain new mixed signals with irrelevant components, selecting and optimizing an initial separation matrix, calculating the convergence to obtain the separation matrix, therefore, the fetal heartbeat information can be easily separated from the multiple mixed signals containing the fetal heartbeat and the pregnant woman, and the instantaneous heart rate and the average heart rate of the fetus can be obtained.

In the above technical solution, the plurality of pre-bent optical fiber sensing units 2.1 in the abdomen supporting belt body 1 are arranged on the abdomen to sense the vibration signals of different parts of the abdomen.

In the technical scheme, the pre-bent optical fiber sensing unit 2.1 is formed by pressing the hard pressing line 2.2 on the optical fiber, and the pre-bending can effectively improve the sensitivity of the optical fiber sensing unit.

In the technical scheme, the vibration sensitive film 2.3 is made of PVC material with the thickness of 0.1-0.3 mm, and the hard pressing line 2.2 is made of plastic optical fiber with the diameter of 0.5-1.5 mm. The optical fiber sensing unit can adopt a fiber grating sensor or an interference type optical fiber sensor. The pre-bent optical fiber sensing unit and the vibration sensitive membrane 2.3 are flexible, environment-friendly and radiation-free, and the two materials can be organically fused with the abdomen supporting belt body and can be used for monitoring weak vibration caused by fetal physiological activities.

In the above technical solution, the signal processing and analyzing module 5 is configured to perform a segmented sliding window processing on a plurality of paths of electrical signals with physiological characteristic information, perform energy calculation on the electrical signals with physiological characteristic information in a window, and determine whether the electrical signals are fetal movement information (the amplitude of the fetal movement signal is much larger than a normal fetal heartbeat signal, and whether the signal includes fetal movement is determined by the signal energy) according to the energy calculation result, if the electrical signals are fetal movement information, mark the fetal movement and return to a sliding data window; the non-fetal movement information is subjected to Bessel filtering to remove baseline noise, eliminate low-frequency noise caused by respiration of the pregnant woman and other physiological motions and realize preprocessing.

Among the above-mentioned technical scheme, signal processing and analysis module 5 is used for carrying out independent component analysis to multichannel mixed signal that contains pregnant woman and foetus heartbeat respectively, and the specific process that obtains the instantaneous heart rate and the average heart rate of foetus is:

the fetal heartbeat information is subjected to autocorrelation calculation, and the time interval between two adjacent fetal heartbeats is obtained by adopting a peak value detection method, so that the instantaneous heart rate and the average heart rate of the fetus can be calculated.

In the above technical solution, the signal processing and analyzing module 5 is configured to perform signal quality analysis based on the intensity of a vibration signal on each mixed signal including the heartbeats of a pregnant woman and a fetus by using autocorrelation operation, obtain a signal quality score of each corresponding mixed signal, compare the signal quality score of each mixed signal with a preset threshold, retain the mixed signal corresponding to the signal quality score reaching the preset threshold, and perform subsequent body position judgment on the fetus (the closer the heart of the fetus is to the sensor, the stronger the vibration signal sensed by the heart of the fetus is, the higher the acquired signal quality is), and delete the mixed signal corresponding to the signal quality score which does not reach the preset threshold;

in the above technical solution, the signal processing and analyzing module 5 is configured to perform signal quality analysis based on the intensity of the vibration signal on each mixed signal including the heartbeat of the pregnant woman and the heartbeat of the fetus through autocorrelation operation, obtain a signal quality score of each corresponding mixed signal, and determine the body position of the fetus by using the signal quality score result of each mixed signal and the distribution position of each pre-bent optical fiber sensing unit 2.1.

In the technical scheme, the mixed heartbeat signal has strong periodicity, and the periodicity quality in the signal can be judged through the autocorrelation operation of the signal. The stronger the vibration signal sensed by the sensing unit, the clearer the periodicity is, the better the signal quality is, otherwise, the worse the signal quality is;

in the technical scheme, the side edge belt 1.1 of the abdomen supporting belt body 1 is of an elastic belt structure, so that the optical fiber sensing array 2 can be tightly attached to the abdomen of a pregnant woman and support the abdomen; the side belt end 1.2 of the abdomen supporting belt body 1 adopts the magic tape design, and is convenient to fix.

Details not described in this specification are within the skill of the art that are well known to those skilled in the art.