JP6487172B2 - Uterus monitoring device and labor monitoring device using the same - Google Patents

Description

The present invention relates to a childbirth monitoring equipment using uterine monitoring device and the same.

  The labor monitor is also called a labor monitor or fetal monitor (outside monitor), and is used for the purpose of knowing the progress of labor by observing the frequency, length, strength, and interval of labor. In the labor monitoring device, it is a measurement technique that requires measurement of a labor curve indicating the intensity of labor and measurement of the fetal heart rate. In the delivery monitoring device, two devices, an ultrasonic probe for measuring the fetal heartbeat and a pressure-sensitive sensor for measuring the intensity of labor, are fixed to the abdomen of the pregnant woman with a belt. Since the measured value is displayed on the monitor of the labor monitoring device and recorded on the recording paper, the state of labor is obvious and is effectively used in the medical field in combination with the continuity of the measurement.

  In addition, Patent Document 1 and Patent Document 2 can be cited as examples of related art related to the above.

Special table 2007-532169 Special table 2013-505032 gazette

  Labor monitoring devices were developed in the 1950s and have been widespread since the 1960s, and no major progress has been made in basic measurement techniques. In particular, regarding the measurement of labor intensity, it is possible to point out the ambiguity of the measurement principle. Current labor intensity measurements are made in the following process.

  (1) A pressure-sensitive sensor (hereinafter referred to as a tonometer) is fixed to the mother's abdomen (bottom of the uterus (on the mother's midline)) with a belt. (2) The abdominal circumference of the mother's abdomen is expanded by contracting the uterus toward the uterine ostium during labor. (3) Since the belt length is fixed, the torometer is pressed by the expansion of the abdominal circumference, and the pressure of the pressure-sensitive portion increases. (4) Measure the pressure increase in the pressure-sensitive part of the labor meter and use it as the labor intensity.

  In other words, the conventional tocodynamometer measures the result of the process of contracting the uterus in the direction of the uterine uterus → expanding the circumference of the uterus → expanding the abdominal circumference of the mother → increasing the pressure in the pressure-sensitive part. Not measured.

  Moreover, since the position of the fetus changes with the progress of parturition, the positions of the tonometer and the ultrasonic probe must be moved as necessary. In addition, because of the improper location of the tonometer, the signs of labor measured by the labor monitor may be different from the actual, so palpation (in the presence of a midwife) must be used.

  In other words, the current measurement method according to the above process does not directly measure uterine contraction, which is the primary cause of labor, but instead considers deformation of the uterus due to uterine contraction from outside as its circumference change. It can be said that the measurement also includes other effects (such as changes in the fetal position) that induce cucumber. Moreover, even if the uterus contracts, if it does not appear as a change in waist circumference, it is not measured as labor pain.

  Patent Document 1 is a birth monitoring system that measures physiological parameters related to labor and the posture of a mother and generates an output signal based on both. Although it is described that a physiological parameter is measured by using an acceleration sensor for posture detection, no specific explanation is given.

  Patent Document 2 detects uterine activity, and detects it by processing an electrical signal and a motion signal. Since an electric signal is essential, it is different from the present invention described later.

In view of the above problems found by the inventors of the present application, uterine monitoring device capable of monitoring uterine contractions with high accuracy, and, to provide a childbirth monitoring equipment using the same Objective.

  In order to achieve the above object, a uterine monitoring apparatus according to the present invention acquires a monitoring result by frequency-analyzing a sensor unit that measures weak vibration of the abdominal surface caused by uterine contraction and an output signal of the sensor unit. And a signal processing unit (first configuration).

  In the uterine monitoring device having the first configuration, the signal processing unit extracts a signal component belonging to a predetermined frequency band from the output signal of the sensor unit and uses it for frequency analysis (second configuration). Good.

  In the uterine monitoring apparatus having the second configuration, the frequency band may be 3 Hz to 20 Hz (third configuration).

  In the uterine monitoring apparatus having any one of the first to third configurations, the sensor unit may be configured to be an acceleration sensor that measures acceleration on the abdomen surface (fourth configuration).

  In the uterine monitoring apparatus having the fourth configuration, the acceleration sensor may be a uniaxial acceleration sensor having sensitivity in a direction perpendicular to the abdominal surface (fifth configuration).

  Further, the uterine monitoring device having any one of the first to fifth configurations may be configured to further include an amplifier unit that amplifies the output signal of the sensor unit (sixth configuration).

  In the uterine monitoring apparatus having the sixth configuration, the amplifier unit may be configured to be incorporated in a sensor module together with the sensor unit (seventh configuration).

  Further, in the uterine monitoring device having any one of the first to seventh configurations, the sensor unit or the sensor module is externally connected by wire or wirelessly to a device body including the signal processing unit (eighth Configuration).

  Further, in the uterine monitoring apparatus having any one of the first to eighth configurations, the signal processing unit acquires information regarding at least one of labor frequency, length, strength, and interval as the monitoring result. (9th configuration).

  In addition, the labor monitoring device according to the present invention may have a configuration (tenth configuration) having a uterine monitoring device having the ninth configuration as maternal labor monitoring means.

  ADVANTAGE OF THE INVENTION According to this invention, it becomes possible to provide the uterine monitoring apparatus which can monitor a uterine contraction with high precision, and the delivery monitoring apparatus using the same.

Block diagram showing a configuration example of a delivery monitoring device The figure which shows one use aspect of the delivery monitoring device typically The figure which shows typically the example of 1 wearing of the labor sensor part 10a The figure for demonstrating the measurement principle of a muscular diagram (MMG) The figure for demonstrating the measurement principle of MMG accompanying a uterine contraction External view of acceleration sensor used as labor pain sensor unit 10a Graph showing first example of measurement result of uterine contraction Graph showing second example of measurement result of uterine contraction Graph to explain the effect of subcutaneous fat thickness Block diagram showing a first configuration example of the sensor module Block diagram showing a second configuration example of the sensor module

<Application to labor monitoring device>
FIG. 1 is a block diagram illustrating a configuration example of the labor monitoring device 1. The labor monitoring device 1 of this configuration example includes a labor sensor unit 10a, a fetal heart rate sensor unit 10b, and a device body 20.

  The labor sensor unit 10a is attached to or affixed to the abdominal surface corresponding to the uterine position of the mother, and measures the weak vibration of the abdominal surface caused by uterine contraction (weak vibration mainly in the vertical direction with respect to the abdominal surface), The sensor signal S1a is output. A measurement of the weak vibration in the radial direction of the muscle that occurs due to the contraction of the muscle is referred to as a myogram (hereinafter referred to as MMG [mechanomyogram]). MMG measurement is performed with the voluntary muscle) as the measurement object. As the labor sensor 10a, an acceleration sensor or the like can be suitably used. The measurement principle of MMG and specific examples of acceleration sensors will be described in detail later.

  The fetal heart rate sensor unit 10b is attached or affixed to the abdominal surface corresponding to the uterine position of the mother, measures the fetal heart rate (movement of the fetal heart valve), and outputs a sensor signal S1b. An ultrasonic probe or the like can be suitably used as the fetal heartbeat sensor unit 10b.

  Note that both the labor pain sensor unit 10a and the fetal heart rate sensor unit 10b are externally connected to the apparatus main body 20 by wire. However, if the wireless communication unit can be incorporated in the labor pain sensor unit 10a and the fetal heartbeat sensor unit 10b, each can be externally connected to the apparatus main body 20 wirelessly.

  The labor pain sensor unit 10a and the fetal heart rate sensor unit 10b are detection means for labor pain and fetal heart rate by external measurement, respectively. It is also possible to use an internal pressure transducer to be detected and an electrocardiographic electrode attached to the fetal head after rupture.

  The apparatus main body 20 is a main body that outputs various delivery monitoring information in response to the sensor signals S1a and S1b, and includes amplifier units 21a and 21b, A / D conversion units 22a and 22b, a signal processing unit 23, and a display unit. 24 and the recording unit 25.

  The amplifier units 21a and 21b amplify the sensor signals S1a and S1b by a predetermined gain and output sensor signals S2a and S2b, respectively.

  The A / D [analogue to digital] converters 22a and 22b respectively convert the analog sensor signals S2a and S2b to generate digital sensor signals S3a and S3b, and send them to the signal processor 23. To do.

  The signal processing unit 23 performs predetermined signal processing (including noise canceling processing, frequency filtering processing, frequency analysis processing, amplitude calculation processing, etc.) on the sensor signals S3a and S3b, thereby providing labor monitoring information (labor pain state (labor pain) Frequency, length, strength, and interval) and fetal heartbeat). Details of the signal processing in the signal processing unit 23 will be described later.

  The display unit 24 displays the delivery monitoring information obtained by the signal processing unit 23.

  The recording unit 25 prints the delivery monitoring information obtained by the signal processing unit 23 on a recording sheet (so-called delivery chart) as a labor intensity curve or a fetal heartbeat curve.

  Of the labor monitoring device 1 configured as described above, the labor sensor unit 10a, the amplifier unit 21a, the A / D conversion unit 22a, and the signal processing unit 23 surrounded by a broken line in the figure monitor the state of uterine contraction. It corresponds to the uterine monitoring device X. That is, it can be said that the delivery monitoring apparatus 1 has a uterine monitoring apparatus X as a maternal labor monitoring means.

  FIG. 2 is a diagram schematically illustrating one usage mode of the labor monitoring device 1. When using the delivery monitoring device 1, it is desirable that the mother should be in a semi-Farler position (a state in which the upper body is laid up on the back and the upper body is raised 15 to 30 degrees) so that no force is applied to the abdominal wall. .

<Labor pain sensor installation example>
FIG. 3 is a diagram (schematic cross-sectional view when the maternal abdomen is viewed from the side) schematically showing an example of wearing of the labor sensor unit 10a. As described above, the labor sensor unit 10a is attached to or pasted on the abdominal surface corresponding to the position of the mother's uterus. Unlike the conventional labor meter using a pressure-sensitive sensor (strain gauge), the labor sensor unit 10a measures MMG caused by uterine contraction, so that it may be on the abdominal surface corresponding to the uterine position. For example, the mounting position (attachment position) is not limited. For example, as in the past, it may be attached or affixed to the bottom of the uterus (on the maternal midline).

<Measuring principle of MMG>
FIG. 4 is a diagram for explaining the principle of measurement of a muscle sound diagram (MMG). When muscles contract, fine muscle fibers contract, but this contraction does not last for a long time but relaxes in a short time. When the muscle contracts continuously for exerting force, the relaxation contraction of fine muscle fibers repeatedly occurs at different locations within the muscle. For this reason, even when the macroscopically contracted muscle contracts to a certain length in the longitudinal direction, microscopically it repeatedly relaxes and contracts, and when it further contracts, the muscle fibers expand in the circumferential direction. In order to do this, the macroscopic muscle repeats minute vibrations in the radial direction. A measurement of the muscular radial vibration generated by the muscle contraction is called a muscular diagram (MMG). In measuring MMG, weak vibrations on the skin surface may be measured using an acceleration sensor or the like, and the muscle activity intensity may be analyzed by frequency analysis.

<Features of MMG>
In MMG measurement, it is possible to directly measure the amount of activity of the muscle to be measured. Moreover, if it is on the muscle of a measuring object, the mounting position (attachment position) of a sensor part will not ask | require. Furthermore, even if the muscles overlap, if the composition ratio of the slow muscle and the fast muscle is different, it is possible to perform measurement by distinguishing both by performing frequency analysis. For example, when the biceps brachii muscle is the measurement target, the frequency band (20 Hz to 35 Hz) of the signal associated with the slow muscle activity and the frequency band (35 Hz or more) associated with the fast muscle activity are separated. By this, each activity amount can be measured individually. In addition, MMG measurement is less susceptible to subcutaneous fat thickness (details will be described later). In addition, when performing MMG measurement, it is not necessary to pre-treat the skin surface to which the sensor unit is attached or pasted.

<Measurement principle of MMG accompanying uterine contraction>
FIG. 5 is a diagram for explaining the principle of MMG measurement accompanying uterine contraction. The column (A) in FIG. 5 shows the relaxed state of the uterus, and the column (B) in FIG. 5 shows the contracted state of the uterus.

  The labor monitoring device 1 in FIG. 1 measures the MMG due to contraction of the uterus, which is an involuntary muscle, by the labor sensor unit 10a attached to or pasted on the surface of the mother's abdomen, and performs frequency analysis thereof to determine the state of labor (uterine contraction). ) State).

  As described above, MMG is caused by relaxation contraction of muscle fibers, and uterine contraction itself can be directly measured. Therefore, the result of the third factor of the pressure increase of the pressure-sensitive part due to the expansion of the abdominal circumference of the mother is measured through the secondary factor of the change of the outer shape of the uterus and the deformation of the mother abdomen caused by the primary factor of uterine contraction. Compared with the conventional tonometer (pressure-sensitive sensor), the measurement process is clearer and its usefulness can be expected.

  The labor sensor unit 10a measures not only MMG associated with uterine contraction but also MMG due to the exertion of rectus abdominis muscle force. However, as shown in FIG. 2 above, the maternal body should be in a semi-Farrer position, use the delivery monitoring device 1 so that no force is applied to the abdominal wall, and the rectus abdominis muscle during delivery. Since it is possible to discriminate the force by observation of the mother body, it is not considered to be a particular problem. Further, since it is considered that there is a difference in frequency bands between MMG accompanying uterine contraction and MMG accompanying rectus abdominis muscle activity, it is considered possible to extract only MMG accompanying uterine contraction.

  In addition, with conventional labor pain meters (pressure-sensitive sensors), the combined use of tactile methods by doctors and midwives is almost essential due to the uncertainty of measurement, but if MMG measurement is used as a labor pain monitoring method, it is clear. Since the uterine contraction can be directly measured by a simple measurement process, the reliability of the labor monitoring device 1 can be remarkably improved. Therefore, it is not always necessary to use the tactile method, so that the burden on the doctor and midwife can be reduced.

<Acceleration sensor>
FIG. 6 is an external view of an acceleration sensor used as the labor sensor unit 10a. The acceleration sensor is a kind of transducer (mechanical energy → electrical signal) that measures the acceleration of the abdominal surface and generates a sensor signal S1a. The acceleration sensor is desirably as small and light as possible (for example, 8.4 cm long and 2.5 g in weight) in view of its mounting properties. MMG associated with uterine contraction is measured as weak vibration mainly in the vertical direction with respect to the maternal abdomen surface. Therefore, it is desirable to use a uniaxial acceleration sensor having sensitivity in a direction perpendicular to the surface of the mother abdomen as the acceleration sensor. However, using a three-axis acceleration sensor is not avoided at all.

<Microphone>
Moreover, as what is used as the labor sensor part 10a, a microphone can be illustrated other than an acceleration sensor. The microphone is also a kind of transducer (air vibration → electrical signal), and measures the air vibration (sound) induced by the weak vibration on the surface of the mother abdomen to generate the sensor signal S1a. If a microphone is used as the labor sensor unit 10a, MMG measurement can be performed without being affected by the posture of the mother body. Further, it is theoretically possible to perform non-contact MMG measurement. Since the frequency band of MMG accompanying uterine contraction is considered to be a low frequency band (approximately 3 to 20 Hz) as described later, sensitivity is low in this low frequency range (a frequency band lower than the human audible range). It is desirable to select a microphone to have. In order to suppress the influence of ambient noise, it is desirable to select a microphone with the highest directivity as much as possible and to take soundproofing / sound insulation measures to block ambient noise.

<Results of uterine contraction measurement>
7A and 7B are graphs showing a first example and a second example of uterine contraction measurement results, respectively. In the (a) column of each figure, the relationship between the frequency of MMG and the RMS [root mean square] value in a state without uterine contraction (a state in which the maternal abdomen is not stretched) is depicted. In the column), the relationship between the MMG frequency and the RMS value in a state where the uterine contraction is present (a state where the maternal abdomen is stretched) is depicted.

  In addition, the mother of the first example (FIG. 7A) was 34 weeks 2 days of gestation, and MMG measurement was performed by sitting. In addition, the mother of the second example (FIG. 7B) was 27 weeks and 4 days of gestation (primary birth), and the MMG measurement was also performed in the sitting position. Moreover, the solid line (CH1) and the broken line (CH2) in each figure show the results of measurement performed at different measurement positions. The subcutaneous fat thickness at each measurement position in the first example (FIG. 7A) was 35.9 mm and 35.4 mm, respectively. The subcutaneous fat thickness at each measurement position in the second example (FIG. 7B) was 29.6 mm and 25.5 mm, respectively.

  As shown in the (a) column of each figure, no signal change was observed at any frequency in the state without uterine contraction. On the other hand, as shown in the (b) column of each figure, in the state with uterine contraction, the signal changed largely in a frequency band of approximately 3 Hz to 20 Hz.

  Since the signal component accompanying the change in the position of the mother exists in a lower frequency band (2 to 3 Hz) than this, it is possible to distinguish between the contraction of the uterus and the change in the position. Also, the signal components of the uterus, which is an involuntary muscle (mainly internal muscles), and the rectus abdominal muscle, which is voluntary muscles (mainly skeletal muscles), are considered to have different frequency bands. It is considered possible.

  Note that it is difficult to specify the frequency band of MMG due to uterine contraction only with the above one measurement example, but if at least the current measurement results are seen, the signal change that appears in the frequency band of approximately 3 Hz to 20 Hz is converted to uterine contraction. It can be assumed that it is caused. Therefore, it is considered desirable for the signal processing unit 23 to extract a signal component belonging to a frequency band of approximately 3 Hz to 20 Hz from the sensor signal S1a (and thus the sensor signal S3a) and use it for frequency analysis.

  The simplest frequency analysis method in the signal processing unit 23 is to calculate the amplitude (RMS value) of a signal component belonging to a frequency band of approximately 3 Hz to 20 Hz and associate the magnitude of the amplitude with the strength of uterine contraction (labor pain). Conceivable.

  Not only the absolute value of labor intensity, but also the frequency with which the labor intensity exceeded the predetermined threshold, the length of the duration that the labor intensity exceeded the threshold, and the interval at which the labor intensity exceeded the threshold. By acquiring information and sequentially outputting the information to the display unit 24 and the recording unit 25, it becomes possible to support delivery monitoring by a doctor or midwife.

<Influence of subcutaneous fat thickness>
FIG. 8 is a graph for explaining the influence of subcutaneous fat thickness. In the (X) column to (Z) column, the subcutaneous fat thickness and the MMG measurement result (RMS value) for different subjects are shown. The relationship is depicted. Note that the MMG measurement is performed using the rectus abdominis muscle as the measurement target. Further, reference signs A, B, and C (reference signs A ′, B ′, and C ′) in the figure indicate MMG measurement results at different measurement points. As can be seen from this figure, no special correlation can be found between the subcutaneous fat thickness and the MMG measurement result. From this, it can be considered that the MMG measurement is not affected by the subcutaneous fat thickness. Even when the measurement object is changed from the rectus abdominis muscle to the uterine muscle, it is estimated that the same result is obtained.

<Sensor module>
In FIG. 1, the configuration in which the amplifier unit 21a is built in the apparatus main body 20 is taken as an example. However, the amplifier unit 32 may be incorporated in the sensor module together with the labor sensor unit 10a.

  FIG. 9 is a block diagram illustrating a first configuration example of the sensor module 30. The sensor module 30 of the first configuration example includes a labor sensor unit 31 (corresponding to the labor sensor unit 10a in FIG. 1) and an amplifier unit 32 (corresponding to the amplifier unit 21a in FIG. 1).

  In this way, by providing the amplifier unit 32 as close as possible to the labor sensor unit 31, the output signal can be amplified before the external noise is superimposed on the very weak output signal of the labor sensor unit 31. Therefore, it is possible to improve the S / N (and thus improve the labor monitoring accuracy).

  Note that the sensor module 30 may be externally connected to the apparatus main body 20 including the signal processing unit 20 via a wire L1. With such a configuration, stable signal transmission from the sensor module 30 to the apparatus main body 20 can be performed.

  FIG. 10 is a block diagram illustrating a second configuration example of the sensor module 30. The sensor module 30 of the second configuration example is basically the same as the first configuration example, but is characterized in that a wireless communication unit 33 is added. That is, the sensor module 30 of the second configuration example is externally connected to the apparatus main body 20 including the signal processing unit 20 by wireless L2. By adopting such a configuration, it is not necessary to install the apparatus main body 20 in the vicinity of the mother body, so that the degree of freedom of MMG measurement accompanying uterine contraction is remarkably increased.

<Use other than delivery monitoring device>
In the above, an example in which the uterine monitoring device X is used as a part of the labor monitoring device 1 has been described. However, the uterine monitoring device X that measures the weak vibration of the abdominal surface caused by uterine contraction monitors the uterine activity of the mother. At this time, it is sufficient to attach or affix a small acceleration sensor or the like to the maternal abdomen, so that it can be easily used not only at the time of delivery but also at the inspection of the perinatal period.

  When it is necessary to continuously monitor the uterine activity over a long period of time, as shown in FIG. 10, the sensor module 30 and the apparatus main body 20 are connected by wireless L2. Is desirable.

  Moreover, as the apparatus main body 20, in addition to the dedicated terminal used in the medical field as in the delivery monitoring apparatus 1 exemplified above, a smartphone or a tablet terminal should be used when assuming personal use. Is also possible.

  For example, it can be used as a personal labor monitoring system comprising a small acceleration sensor and a smartphone. When a pregnant woman who has reached the last month feels abdominal tension at home, it may be difficult to determine whether or not she is in labor. In such a case, by using the labor monitoring system, it is possible to know the state of uterine contraction (frequency, intensity, interval, etc.) while staying at home.

  The smartphone corresponding to the apparatus main body 20 executes the labor monitoring application installed therein, analyzes the output of the acceleration sensor, determines whether or not it is labor, and displays the determination result on the display. A notification sound or a notification message is output from the speaker. According to such a labor monitoring system, a pregnant woman can know the start of labor without delay, and can quickly visit a medical institution.

  In addition, the smartphone naturally has an infrastructure communication function (telephone function, mail function, etc.). Therefore, when the start of labor is determined, or when the confirmation operation of a pregnant woman who has received the notification is accepted, the smartphone will automatically contact a medical institution that has been pre-registered in the labor monitoring application. It may be. By adopting such a configuration, even when the pregnant woman cannot move due to labor, the medical institution can quickly grasp the state of the pregnant woman, so that the mother and child can be safe.

  In addition, the mechanism of development is the same in that both labor and menstrual pain are caused by uterine contractions. Considering this point and further expanding the application scene, the uterine monitoring device X can be used not only as a parturition or perinatal period but also as a means of monitoring the state of uterine contraction during menstruation. It is done. For example, it is assumed to be utilized as a gynecological-related examination device for the purpose of elucidating the mechanism of extreme menstrual pain. Of course, the size of the uterus in the perinatal period and the uterus in the menstrual period are quite different, so the MMG measurement and frequency analysis methods need to be further examined or verified. However, as described above, since MMG measurement is hardly affected by subcutaneous fat thickness, it is considered that the uterine contraction during menstruation can be theoretically measured.

<Other variations>
The various technical features disclosed in the present specification can be variously modified within the scope of the technical creation in addition to the above-described embodiment. That is, the above-described embodiment is to be considered in all respects as illustrative and not restrictive, and the technical scope of the present invention is indicated not by the description of the above-described embodiment but by the scope of the claims. It should be understood that all modifications that fall within the meaning and range equivalent to the terms of the claims are included.

  The present invention can be used, for example, in medical equipment such as a labor monitoring device.

X uterine monitoring device 1 delivery monitoring device 10a labor sensor unit 10b fetal heart rate sensor unit 20 device body 21a, 21b amplifier unit 22a, 22b A / D conversion unit 23 signal processing unit 24 display unit 25 recording unit 30 sensor module 31 labor pain sensor unit 32 Amplifier unit 33 Wireless communication unit

Claims (10)

A sensor unit for measuring a myogram that appears as a weak vibration of the abdominal surface related to the contraction activity of the uterine muscle caused by uterine contraction;
A signal processing unit that obtains a monitoring result by performing frequency analysis on the output signal of the sensor unit;
A uterine monitoring device comprising: The signal processing unit extracts a signal component belonging to a predetermined frequency band of the muscular diagram from the output signal of the sensor unit and uses it for frequency analysis,
The uterine monitoring apparatus according to claim 1, wherein the predetermined frequency band indicates the presence or absence of the uterine contraction.   The uterine monitoring apparatus according to claim 2, wherein the frequency band indicating the presence or absence of the uterine contraction is 3 Hz to 20 Hz.   The uterine monitoring apparatus according to any one of claims 1 to 3, wherein the sensor unit that measures the phonogram is an acceleration sensor that measures acceleration on the surface of the abdomen.   5. The uterine monitoring apparatus according to claim 4, wherein the acceleration sensor that measures the phonogram is a uniaxial acceleration sensor having sensitivity in a direction perpendicular to the abdominal surface.   The uterine monitoring apparatus according to claim 1, further comprising an amplifier unit that amplifies an output signal of the sensor unit that measures the myonogram.   The uterine monitoring apparatus according to claim 6, wherein the amplifier unit is incorporated in a sensor module together with the sensor unit.   8. The sensor unit or the sensor module for measuring the phonogram is externally connected to a device main body including the signal processing unit by wire or wirelessly. The uterine monitoring device according to Item.   The said signal processing part acquires the information regarding at least one of the frequency, length, intensity | strength, and space | interval of labor as the said monitoring result, The any one of Claims 1-8 characterized by the above-mentioned. The uterine monitoring device according to.   A delivery monitoring apparatus comprising the uterine monitoring apparatus according to claim 9 as maternal labor monitoring means.

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