JP2014045918A - Fetal heart beat microphone - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a fetal heart beat microphone reduced in influence of noise.SOLUTION: A fetal heart beat microphone 1 is brought into contact with the body of a pregnant mother to listen fetal heart beat generating in vivo. A microphone element 2 outputs electric signals corresponding to vibration detected from a contact surface 8 with the body of the pregnant mother. An inner case 3 stores the microphone element 2. An outer case 6 is set so as to cover the outside surface of the inner case 3. The inner case 3 and the outer case 3 are connected via two support members 5-1 and 5-2.

Description

  The present invention relates to a fetal heart sound microphone, and more particularly to a fetal heart sound microphone having a noise reduction function.

  2. Description of the Related Art In recent years, there have been proposed devices for acquiring various living body conditions including a human using a contact microphone. Non-Patent Document 1 proposes a contact microphone for the human body. Non-Patent Document 2 proposes a method for obtaining biological information of a fetus in a pregnant mother body by applying a contact microphone to the human body. This method is very effective because it can extract the biological information of the fetus in the mother's body in a completely non-invasive manner. Patent Document 1 discloses a biological sound detection device that can output only a biological sound signal generated in the body of a non-measurement person.

  In the following, we will investigate the detection of fetal heart sounds in a pregnant mother's body using a biological microphone. In general, during the period up to around 25 weeks of gestation, the fetus easily moves in the mother's body, and therefore the position in the mother's body is likely to change. Even after the position of the fetus within the mother's body is determined, the optimal contact position between the fetal heart sound microphone and the surface of the mother's body changes depending on the posture and orientation of the fetus.

Japanese Patent Laid-Open No. 2000-60845

Nakamura Yuki, "NAM Interface Communication", Nara Institute of Technology, Doctoral Dissertation, February 2, 2005 Kansai Cultural Science Research City Promotion Organization, “2008-2010 Research Report, Development of Ubiquitous Biomedical Healthcare Device System”, 2009

  As described above, the position and posture of the fetus in the mother's body vary from time to time. Therefore, in order to measure the fetal heart sound, it is necessary to first find an optimal heart sound listening position (contact position between the fetal microphone and the mother surface) on the surface of the pregnant mother. That is, the user needs to hold the fetal heart sound microphone by hand and move it on the maternal surface. Further, the fetal heart sound microphone is gripped by the user at the time of measurement and used in a state of being in contact with the pregnant woman's mother.

  As described above, since the fetal heart sound microphone is gripped and handled by a user (for example, a pregnant woman), it is affected by noise caused by hand shaking or vibration. This noise has a problem that the measurement accuracy of the fetal heart sound is deteriorated.

  The present invention has been made to solve such problems, and a main object of the present invention is to provide a fetal heart sound microphone in which the influence of noise is reduced.

Therefore, the present invention is a fetal heart sound microphone (1) for listening to fetal heart sounds generated in the mother body in contact with a pregnant woman mother body,
A microphone element (2) that outputs an electrical signal corresponding to vibration detected from the contact surface with the mother's body, an inner case (3) that houses the microphone element, and an outer case that is provided outside the inner case ( 6), and the outer case (6) and the inner case (3) are connected by one support member (5-3) or two support members (5-1, 5-2). A heart sound microphone (1) is provided.
In the fetal heart sound microphone (1), the two support members (5-1, 5-2) are arranged coaxially, and the contact surface (8) with the pregnant mother and the two support members (5-1). The direction connecting 5-2) may be substantially parallel.
In the fetal heart sound microphone (1), the inner case (3) is configured to be rotatable about the one support member (5-3) or the two support members (5-1, 5-2). May be.
In the fetal heart sound microphone (1), a sound insulation member (10) may be provided between the outer case (6) and a parallel surface of the contact surface with the pregnant mother.
In the fetal heart sound microphone (1), the one support member (5-3) or the two support members (5-1, 5-2) may each have a cylindrical shape.
In the fetal heart sound microphone (1), the inner case (3) extends from a plane parallel to the contact surface (8), and the upper surface of the inner case (3) and the microphone element (2) You may further have the damping part (11) provided so that the upper surface might be covered.
The fetal heart sound microphone (1) is a fetal heart sound microphone (1) that is brought into contact with the mother's body and listens to the fetal heart sound generated in the mother's body. First (2) and second microphone elements (2) for outputting;
A first inner case (3-1) for accommodating the first microphone element (2), a second inner case (3-2) for accommodating the second microphone element (2), and the first inner case ( 3-1) and an outer case (6) provided outside the second inner case (3-2), the outer case (6) and the first inner case (3-1) being 1 Are connected by one support member or two support members (5-1, 5-2), and the outer case (6) and the second inner case (3-2) are one support member or two support members ( 5-4, 5-5).
In the fetal heart sound microphone (1), the one support member or the two supports connecting the longitudinal direction of the outer case (6) and the outer case (6) and the first inner case (3-1). The axial direction of the members (5-1, 5-2) is substantially orthogonal, and the longitudinal direction of the outer case (6) is connected to the outer case (6) and the second inner case (3-2). The configuration may be such that the axial direction of the one supporting member or the two supporting members (5-4, 5-5) is substantially orthogonal.

  In the present invention, it is possible to provide a fetal heart sound microphone in which the influence of noise is reduced.

1 is a perspective view of a fetal heart sound microphone 1 according to a first embodiment of the present invention. It is a longitudinal cross-sectional view of the fetus heart sound microphone 1 concerning Embodiment 1 of this invention. It is a figure which shows the structure of the hole 9-1 and the supporting member 5-1 concerning Embodiment 1 of this invention. It is a figure which shows the structural example of the hole 9-1 and the supporting member 5-1 concerning Embodiment 1 of this invention. It is a figure which shows the structural example of the hole 9-1 and the supporting member 5-1 concerning Embodiment 1 of this invention. It is a figure which shows the structural example of the hole 9-1 and the supporting member 5-1 concerning Embodiment 1 of this invention. It is a figure which shows the structural example of the hole 9-1 and the supporting member 5-1 concerning Embodiment 1 of this invention. It is a figure which shows the measurement result concerning the influence of the external vibration in a common fetal heart sound microphone. It is a figure which shows the measurement result concerning the influence of the external vibration in the fetus heart sound microphone 1 concerning Embodiment 1 of this invention. 1 is a perspective view of a fetal heart sound microphone 1 according to a first embodiment of the present invention. It is a figure which shows the structural example of the hole 9-3 and the supporting member 5-3 concerning Embodiment 1 of this invention. It is a perspective view of the fetus heart sound microphone 1 concerning Embodiment 2 of this invention. It is a longitudinal cross-sectional view of the fetal heart sound microphone 1 according to the second embodiment of the present invention. It is a longitudinal cross-sectional view of the fetus heart sound microphone 1 concerning Embodiment 3 of this invention. It is a perspective view of fetal heart sound microphone 1 concerning other embodiments of the present invention. It is a longitudinal cross-sectional view of the fetal heart sound microphone 1 concerning other embodiment of this invention. It is a figure which shows the structure of the fetus heart sound microphone 1 concerning other embodiment of this invention.

<Embodiment 1>
Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a perspective view showing a fetal heart sound microphone 1 according to the present embodiment. In addition, in order to make it easy to visually recognize the drawings in this specification, the illustrations may be simplified as appropriate, or the scales and positions of some members may be different from the actual specifications.

  The fetal heart sound microphone 1 according to the present embodiment includes an inner case 3, an outer case 6, and two support members 5-1 and 5-2 that connect the inner case 3 and the outer case 6. The support members 5-1 and 5-2 are one aspect of a connecting portion that connects the outer case 6 and the inner case 3.

  The outer case 6 is a housing that is held by a user (for example, a pregnant woman). The inner case 3 accommodates a microphone element 2 and the like, which will be described later, and has a contact surface 8 (not shown in FIG. 1) for contact with the mother's mother on the surface facing the upper surface of the outer case 6. Here, the direction in which the contact surface 8 of the inner case 3 is viewed from the upper surface of the outer case 6 is defined as the downward direction or the vibration detection direction, and the reverse direction is defined as the upward direction. The support members 5-1 and 5-2 are provided on the same axis and connect the inner case 3 and the outer case 6. Here, the axial directions of the support members 5-1 and 5-2 are substantially parallel to the contact surface 8 of the inner case 3.

  This will be further described with reference to FIG. FIG. 2 is a longitudinal sectional view of the fetal heart sound microphone 1. The cross section includes the axes of the support members 5-1 and 5-2. The fetal heart sound microphone 1 includes a microphone element 2, an inner case 3, a vibration transmission unit 4, support members 5-1 and 5-2, and an outer case 6. A diaphragm 7 is provided between the upper surface of the vibration transmitting unit 4 and the lower surface of the microphone element 2. That is, the microphone element 2 has the diaphragm 7 exposed in the vibration detection direction (downward direction). The lower surface (bottom surface) of the vibration transmitting unit 4 has a contact surface 8 that comes into contact with the surface of the mother's body.

  The microphone element 2 detects vibration in the diaphragm 7. The microphone element 2 outputs an electrical signal corresponding to the detected vibration to an arbitrary processing unit (for example, a display device or a printing device) that is electrically connected to the fetal heart sound microphone 1. The processing unit to which the electric signal is supplied displays a waveform or the like indicating the vibration state on a display or the like, so that the user can grasp the heart sound state of the fetus. The fetal heart sound microphone 1 may have a signal processing unit (not shown), and the fetal heart sound data processed by the signal processing unit may be displayed on a display unit provided on the outer surface of the outer case 6. is there.

  The microphone element 2 may be any type of microphone element such as an electric capacitor type, a capacitor type, a piezoelectric type, and a dynamic type. The type of the microphone element 2 is selected according to the use environment and the detection target, but it is most effective to use an electric capacitor type from the viewpoint of weight reduction, size reduction, circuit signal processing, and the like. .

  The vibration transmission unit 4 is a vibration transmission medium that transmits the vibration of the fetal heart sound generated from the contact surface 8 on the surface of the maternal mother body, which is a detection target (vibration source), to the diaphragm 7. The vibration transmission unit 4 may be a medium that transmits the vibration of the contact surface 8 to the vibration plate 7. For example, the vibration transmission unit 4 may be configured to be filled with silicon gel or may be air (that is, the vibration transmission unit 4 is hollow). When silicon gel, which is a medium close to the maternal mother, is used as the vibration transmitting unit 4, the difference in acoustic impedance between the maternal mother and the fetal heart sound microphone 1 is reduced, and attenuation of fetal heart sound vibration can be avoided. . The vibration transmitting unit 4 may be conical (trapezoidal shape in the drawing) as shown, or may be conical, parabolic, horn shaped, or the like. The vibration transmission unit 4 may have any shape that can most efficiently transmit the vibration of the fetal heart sound according to the distance between the microphone element 2 and the contact surface 8 or the like.

  The diaphragm 7 that is in contact with the microphone element 2 is in contact with the vibration transmitting unit 4. The diaphragm 7 is a plate-like member that is in contact with the vibration transmission unit 4, but is not necessarily limited to the plate-like member, and may be a diaphragm, for example.

  The inner case 3 is disposed so as to cover the outer surfaces of the microphone element 2 and the vibration transmitting unit 4. In other words, the inner case 3 accommodates the microphone element 2 and the vibration transmission unit 4. Although the inner case 3 has a cylindrical shape as shown in the drawing, the inner case 3 is not necessarily limited to this, and may have another shape (for example, a hexagonal cylindrical shape, an octagonal cylindrical shape, etc.). The inner case 3 is formed of a highly vibration-damping metal such as aluminum, brass, or stainless steel, a resin such as ABS resin, PET resin, or PC (polycarbonate).

  Two support members 5-1 and 5-2 are provided on the outer surface of the inner case 3. The support members 5-1 and 5-2 have a cylindrical shape. The support members 5-1 and 5-2 can have a shape other than the cylindrical shape (for example, a hexagonal cylinder, an octagonal cylinder, etc.), but as will be described later, the support members 5-1 and 5-2 In order to become a rotation axis, a cylindrical shape is desirable. The support members 5-1 and 5-2 are provided on the same axis, and a straight line connecting the support members 5-1 and 5-2 is substantially parallel to the contact surface 8. The support members 5-1 and 5-2 can be made of the same material as that of the inner case 3, or may be configured using other materials.

  The outer case 6 is disposed so as to cover the outer surface of the inner case 3. The outer case 6 is a portion that is held by a user (for example, a pregnant woman). Although the outer case 6 has a cylindrical shape in FIGS. 1 and 2, the outer case 6 is not necessarily limited thereto, and may have another shape. Further, the outer case 6 has a curved portion between the upper surface portion and the side surface portion as shown in the figure, but is not necessarily limited thereto, and may be any shape suitable for gripping.

  The outer case 6 has two holes 9-1 and 9-2 on the inner surface. The holes 9-1 and 9-2 are provided on the same axis. The holes 9-1 and 9-2 are fitted with the support members 5-1 and 5-2, respectively. Thereby, the outer case 6 and the inner case 3 are connected. The contact points between the inner case 3 and the outer case 6 are only the support members 5-1 and 5-2. Since the contact points are only the support members 5-1 and 5-2 and the support members 5-1 and 5-2 are in the coaxial direction, the inner case 3 supports the outer members 6 and the support members 5-1 and 5-5. -2 as an axis.

  The relationship between the support member 5-1 and the hole 9-1 will be described with reference to FIG. FIG. 3A is an enlarged view of a portion related to the hole 9-1 and the support member 5-1 in FIG. The example of the AA cross section in FIG. 3A is shown to FIG. 3B-FIG. 3E.

  FIG. 3B shows a configuration example in which the hole 9-1 has a cylindrical shape, and the support member 5-1 has a cylindrical shape having substantially the same diameter as the hole 9-1. FIG. 3C is a configuration example in which the hole 9-1 has an elliptical cross section and the support member 5-1 has a cylindrical shape. FIG. 3D is a configuration example in which the hole 9-1 has a square cross section and the support member 5-1 has a cylindrical shape. FIG. 3E is a configuration example in which the cross section of the hole 9-1 is a regular hexagon and the support member 5-1 is a cylindrical shape. 3C to 3E, the support member 5-1 and the hole 9-1 have a plurality of contacts as illustrated. As shown in FIGS. 3B to 3E, the inner case 3 can be rotated about the support members 5-1 and 5-2 by making the support member 5-1 cylindrical.

  Although it is possible to rotate the support member 5-1 without making the support member 5-1 cylindrical, it is preferable to make the support member 5-1 cylindrical because the inner case 3 is rattled. Moreover, as shown to FIG. 3B, the structure which makes the hole 9-1 and the supporting member 5-1 substantially the same shape, or as shown to FIG. 3C-FIG. By having a configuration, it is possible to reduce the play at the time of rotation of the inner case 3. The configurations in FIGS. 3B to 3E are merely examples, and it is needless to say that other configurations may be used as long as the inner case 3 is rotatable. The relationship between the hole 9-2 and the support member 5-2 is substantially the same as the relationship shown in FIG.

  Next, effects of the fetal heart sound microphone 1 according to the present embodiment will be described. As described above, the fetal heart sound microphone 1 according to the present embodiment is configured to be used by the user holding the outer case 6. The outer case 6 and the inner case 3 accommodating the microphone element 2 are connected by two support members 5-1 and 5-2. In other words, the contact points between the outer case 6 and the inner case 3 gripped by the user are only the two support members 5-1 and 5-2. Thus, by reducing the contact portion between the outer case 6 and the inner case 3 that is affected by the shaking of the user's hand, hand shaking or the like is difficult to be transmitted to the inner case 3. Since the shaking of the hand or the like is not transmitted to the inner case 3, the noise (noise) detected by the microphone element 2 accommodated in the inner case 3 can be reduced.

  FIG. 4 shows the measurement results related to the influence of external vibration. 4A shows a fetal heart sound microphone having no outer case 6 (that is, a fetal heart sound microphone in a form in which the user holds the inner case 3), the contact surface 8 being placed on the living body dummy sheet, It is a graph which shows the change of a volume level at the time of putting an exciter and giving an external vibration. FIG. 4B shows the fetal heart sound microphone 1 having the outer case 6 (that is, the fetal heart sound microphone 1 according to the present embodiment) with the contact surface 8 placed on the living body dummy sheet and the exciter placed on the outer case 6. It is a graph which shows the change of the volume level at the time of giving external vibration.

  As shown in the figure, when the fetal heart sound microphone 1 according to the present embodiment is used (FIG. 4B), the volume level is higher than that when the fetal heart sound microphone without the outer case 6 is used at each frequency (FIG. 4A). Is small. That is, when the fetal heart sound microphone 1 according to the present embodiment is used (FIG. 4B), it is more influenced by the exciter that is external vibration than when the fetal heart sound microphone without the outer case 6 is used (FIG. 4A). It ’s hard.

  Hereinafter, effects other than noise reduction by the support member 5-1 and the support member 5-2 will be described. Further, the support member 5-1 and the support member 5-2 are provided coaxially. Thereby, the inner case 3 can be reliably fixed to the outer case 6 while keeping the size of the support members 5-1 and 5-2 small.

  Furthermore, as described above, the inner case 3 is configured to be rotatable with respect to the outer case 6 about the support members 5-1 and 5-2. The curved surface of the maternal body surface changes depending on the age of the fetus and the position of the abdomen. However, since the inner case 3 is configured to be rotatable as described above, the contact surface 8 and the maternal mother surface can be brought into close contact with each other regardless of the orientation of the hand holding the outer case 6. By bringing the contact surface 8 and the maternal body surface into close contact with each other, the influence of external vibration can be reduced.

  As shown in the perspective view of FIG. 5, the fetal heart sound microphone 1 may have only one support member 5-3. The support member 5-3 has a configuration substantially corresponding to the support member 5-1 or 5-2, and has a cylindrical shape. Even in this configuration, the contact portion between the inner case 3 and the outer case 6 can be reduced, and noise (noise) caused by hand shaking or the like can be reduced. Further, even in this configuration, the inner case 3 can be rotated by adopting the configuration shown in FIG. 3, so that the contact surface 8 and the maternal mother surface can be used regardless of the orientation of the user's hand holding the outer case 6. Can be brought into close contact with each other. The support member 5-3 has a cylindrical shape like the support members 5-1 and 5-2. As a result, rattling during rotation of the inner case 3 can be prevented. In this configuration, since the contact portion between the inner case 3 and the outer case 6 is only the support member 5-3, the support member 5-3 needs to have sufficient strength.

  FIG. 6 is a diagram illustrating an example of the relationship between the hole 9-3 (the hole of the outer case 6 corresponding to the support member 5-3) and the support member 5-3 when there is one support member. As shown in FIG. 6, the support member 5-3 is configured to have a convex portion at the tip portion, and the hole 9-3 preferably has a groove for fitting with the convex portion. Thereby, even if it is a case where the number of supporting members is one, the inner case 3 can be reliably fixed to the outer case 6.

<Embodiment 2>
The fetal heart sound microphone 1 according to the present embodiment is characterized in that a sound insulating member 10 is provided between the outer case 6 and the pregnant woman mother. The fetal heart sound microphone 1 according to the present embodiment will be described below with respect to differences from the first embodiment.

  FIG. 7 is a perspective view showing the fetal heart sound microphone 1 according to the present embodiment. The fetal heart sound microphone 1 according to the present embodiment further includes a sound insulation member 10 in addition to the inner case 3, the outer case 6, and the support members 5-1 and 5-2.

  FIG. 8 is a longitudinal sectional view of the fetal heart sound microphone 1 according to the present embodiment. The cross section includes the axes of the support members 5-1 and 5-2. The sound insulating member 10 is provided between the lower surface of the outer case 6 and the parallel surface of the contact surface 8. When the outer case 6 has a cylindrical shape as shown in FIG. 7, the sound insulating member 10 has a substantially ring shape. The sound insulating member 10 is a member that blocks external noise that enters from the gap between the outer case 6 and the pregnant woman mother. Moreover, the sound insulation member 10 is a location which contacts the maternal body surface. Therefore, it is desirable that the sound insulating member 10 is a soft member having a cushioning property. The sound insulating member 10 is preferably a soft polymer material such as gel or silicon, a nonwoven fabric, or the like. In addition, as shown in FIG. 5, even if it is a case where a supporting member is one structure, the sound-insulating member 10 can be provided.

  Next, the effect of the fetal heart sound microphone 1 according to the present embodiment will be described. As described above, the fetal heart sound microphone 1 according to the present embodiment has the sound insulating member 10 between the surface of the pregnant woman's mother and the outer surface of the lower side (vibration detection direction side) of the outer case 6. The sound insulating member 10 blocks external noise from the gap between the inner case 3 and the outside. Thereby, the external noise transmitted to the microphone element 2 in the inner case 3 can be reduced. Moreover, the burden with respect to a pregnant woman mother body can be reduced by making the sound insulation member 10 into a soft member with cushioning properties.

<Embodiment 3>
The fetal heart sound microphone 1 according to the present embodiment is characterized in that a vibration damping unit 11 is further provided inside the inner case 3. The fetal heart sound microphone 1 according to the present embodiment will be described below with respect to differences from the first embodiment.

  Since the fetal heart sound microphone 1 according to the present embodiment is different from the first embodiment only in the internal configuration of the inner case 3, the configuration will be described with reference to the sectional view of FIG. FIG. 3 is a cross-sectional view showing the configuration of the fetal heart sound microphone 1. The cross-sectional view includes an axis connecting the support members 5-1 and 5-2.

  As shown in the figure, the inner case 3 has a damping portion 11 extending from the parallel surface of the contact surface 8 in a direction substantially parallel to the outer surface of the inner case 3. The damping unit 11 is installed so as to cover the upper surfaces of the inner case 3 and the microphone element 2. That is, the damping unit 11 is provided so as to cover the microphone element 2. Since the vibration control part 11 plays the role which interrupts external noise, it is desirable that it is excellent in the anti-sliding noise characteristic and the external environmental noise characteristic. As a preferable example, the damping unit 11 includes a viscoelastic body and a rubber elastic body, and a particularly preferable example is a urethane nest lammer. In FIG. 9, the damping unit 11 is in contact with the upper surface of the inner case 3 and the microphone element 2, but is not necessarily limited thereto. For example, the damping unit 11 and the upper surface of the inner case 3 and the microphone element 2 There may be a cavity between them.

  The effect of the fetal heart sound microphone 1 according to the present embodiment will be described. The fetal heart sound microphone 1 has a vibration control unit 11 inside. As described above, the vibration control unit 11 is composed of a member (for example, urethane nest lammer) having excellent sliding noise resistance and external environmental noise characteristics. Therefore, the provision of the control unit 11 makes it difficult for vibration from the hand holding the outer case 6 to propagate to the microphone element 2 and makes noise from the external space difficult to propagate to the microphone element 2. That is, by providing the vibration control unit 11, it is possible to further reduce the influence of noise other than the fetal heart sound.

  The damping unit 11 is provided so as to cover the upper surface of the microphone element 2. Since the damping part 11 is made of a highly elastic material such as urethane nest lammer, the effect of preventing excessive pressure from being applied to the microphone element 2 and the vibration transmitting part 4 when the contact surface 8 is pressed against the pregnant woman's body. There is also. That is, even when the fetal heart sound microphone 1 is strongly pressed against the mother's body, the pressure applied to the microphone element 2 and the vibration transmission unit 4 can be reduced by the vibration control unit 11 being bent upward.

<Other embodiments>
It is also possible to constitute the fetal heart sound microphone 1 having a plurality of inner cases 3 for one outer case 6. The configuration will be described below.

  FIG. 10 is a perspective view showing the fetal heart sound microphone 1 having a plurality of inner cases 3 (3-1, 3-2) with respect to one outer case 6. In FIGS. 10 to 12, a part denoted by a symbol using “-” as in the inner case 3-1 has a corresponding part having the same name in the first to third embodiments (for example, the inner case 3-3). If it is 1, the inner case 3) has substantially the same configuration as the first to third embodiments. Further, in FIG. 10, for the sake of clarity of the drawing, only the reference numerals of main components are given (the same applies to the other drawings (FIGS. 11 and 12)).

  As shown in the drawing, the outer case 6 in the fetal heart sound microphone 1 according to the present embodiment has a horizontally long shape to accommodate the two inner cases 3 (3-1, 3-2). The inner case 3-1 is connected to the outer case 6 by support members 5-1 and 5-2. The inner case 3-2 is connected to the outer case 6 by support members 5-4 and 5-5. As shown in the figure, the outer case 6 has a curved surface. However, the shape of the outer case 6 shown in FIG. 10 is merely an example, and other shapes can be used as long as the shape has a longitudinal direction and a short direction. There may be.

  FIG. 11 is a cross-sectional view of the fetal heart sound microphone 1 shown in FIG. In the sectional view, the positions of the support member 5-1 and the support member 5-4 are also shown for reference. In this example, the outer case 6 is composed of three members (an outer case housing 6-1, an outer case housing 6-2, and an outer case housing 6-3). The outer case casing 6-1 is a casing having a hole connected to each support member. The flat outer case housing 6-2 on the upper side of the outer case housing 6-1 has wiring holes 12 (12-1, 12-2) substantially directly above the microphone elements 2 (2-1, 2-2). Is provided. The wiring hole 12 is a hole through which an electronic cable (not shown) extending from each microphone element 2 (2-1, 2-2) passes. The electronic cable is connected to a circuit that processes the audio signal collected by each microphone element 2 (2-1, 2-2). As shown in the drawing, the longitudinal direction of the outer case 6 and the axial direction of each support member are provided in a substantially orthogonal direction.

  In addition, since the structure in the inner case 3 (3-1, 3-2) is the same as that of FIG. 2, detailed description is abbreviate | omitted.

  FIG. 12 is a diagram illustrating a configuration of the fetal heart sound microphone 1 viewed upward from the bottom surface (contact surface 8 with the mother's body surface). As described above, the outer case 6 has a horizontally long shape. The support member 5-1 and the support member 5-2 are provided in a coaxial relationship in a direction substantially orthogonal to the longitudinal direction of the outer case 6. Similarly, the support member 5-4 and the support member 5-5 are provided in a coaxial relationship in a direction substantially orthogonal to the longitudinal direction of the outer case 6. Note that FIG. 12 illustrates a configuration in which one inner case 3 has two support members, but even when the inner case 3 and the outer case 6 are connected by one support member, the outer case 6 The longitudinal direction and the axial direction of this one support member are substantially orthogonal. Inner cases 3-1 and 3-2 are configured to be rotatable in the same manner as in the first and second embodiments.

  In the said structure (FIGS. 10-12), the fetal heart sound was heard by the two microphone elements 2 (2-1, 2-2), and the two microphone elements 2 (2-1, 2-2) were heard. By handling the audio signal, more accurate fetal heart sound data can be obtained as compared with the configuration having one microphone element 2.

  Further, in the present embodiment, as shown in FIG. 12, the support member 5-1 and the support member 5-2 are provided in a coaxial relationship in a direction substantially orthogonal to the longitudinal direction of the outer case 6. Similarly, the support member 5-4 and the support member 5-5 are provided in a coaxial relationship in a direction substantially orthogonal to the longitudinal direction of the outer case 6. Thus, even when the user holds the outer case 6 and moves the fetal heart sound microphone 1 so that the contact surface 8 of the fetal heart sound microphone 1 slides on the surface of the pregnant woman's mother, It can be adhered.

  Although the present invention has been described with reference to the above embodiment, the present invention is not limited to the configuration of the above embodiment, and can be made by those skilled in the art within the scope of the invention of the claims of the claims of the present application. It goes without saying that various modifications, corrections, and combinations are included. For example, although an example having two inner cases 3 (that is, two microphone elements 2) has been described in FIG. 10, the present invention is not necessarily limited thereto, and a configuration having three or more inner cases 3 is also possible.

DESCRIPTION OF SYMBOLS 1 Fetal heart sound microphone 2 Microphone element 3 Inner case 3-1 Inner case 3-2 Inner case 4 Vibration transmission part 5-1 Support member 5-2 Support member 5-3 Support member 5-4 Support member 5-5 Support figure goods 6 Outer case 7 Diaphragm 8 Contact surface 9-1 Hole 9-2 Hole 9-3 Hole 10 Sound insulation member 11 Damping part 12-1 Wiring hole 12-2 Wiring hole

Claims (8)

A fetal heart sound microphone that listens to the fetal heart sound generated in the mother body in contact with the pregnant woman's mother body,
A microphone element that outputs an electrical signal corresponding to the vibration detected from the contact surface with the mother's body;
An inner case for accommodating the microphone element;
An outer case provided outside the inner case,
The fetal heart sound microphone, wherein the outer case and the inner case are connected by one support member or two support members.   The fetal heart sound microphone according to claim 1, wherein the two support members are arranged coaxially, and a direction connecting the contact surface with the pregnant mother and the two support members is substantially parallel.   The fetal heart sound microphone according to claim 1, wherein the inner case is configured to be rotatable about the one support member or the two support members.   The fetal heart sound microphone according to any one of claims 1 to 3, further comprising a sound insulation member between the outer case and a parallel surface of a contact surface with the maternal mother body.   The fetal heart sound microphone according to any one of claims 1 to 4, wherein each of the one support member or the two support members has a cylindrical shape.   The apparatus further comprises a vibration damping portion that extends from a surface parallel to the contact surface to the inside of the inner case and is provided to cover the upper surface of the inner case and the upper surface of the microphone element. The fetal heart sound measuring device according to any one of 1 to 5. A fetal heart sound microphone that listens to the fetal heart sound generated in the mother body in contact with the pregnant woman's mother body,
First and second microphone elements that output electrical signals corresponding to vibrations detected from the contact surface with the mother's body;
A first inner case that houses the first microphone element;
A second inner case for accommodating the second microphone element;
An outer case provided outside the first inner case and the second inner case,
The outer case and the first inner case are connected by one support member or two support members,
The fetal heart sound microphone, wherein the outer case and the second inner case are connected by one support member or two support members. The longitudinal direction of the outer case and the axial direction of the one support member or the two support members that connect the outer case and the first inner case are substantially orthogonal,
The longitudinal direction of the outer case and the axial direction of the one support member or the two support members that connect the outer case and the second inner case are substantially orthogonal to each other. Fetal heart sound microphone.

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