JP2019024631A - Biological sound acquisition device - Google Patents

Abstract

To reduce noise effectively.MEANS: A biological sound acquisition device (1) includes a body part (23), an acquisition part (21) for acquiring a biological sound, and a first member (22) for holding the acquisition part in an internal space of the body part. The body part includes a first communication part (231) for communicating a first surface of the first member with an external space of the body part, and a second communication part (232) for communicating a second surface of the first member with the external space.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a technical field of a body sound acquisition apparatus such as an electronic stethoscope.

  In this type of apparatus, a technique for reducing noise when acquiring a body sound has been proposed. For example, Patent Document 1 discloses a technique in which a sensor support unit and an operation unit are coupled via a noise absorbing material in order to reduce noise transmitted from a finger of a doctor or the like.

JP 2012-090909 A

  According to research conducted by the inventors of the present application, it cannot be said that noise can be sufficiently reduced only by reducing noise transmitted from a measurement side such as a doctor.

  Examples of problems to be solved by the present invention include the above. An object of the present invention is to provide a biological sound acquisition apparatus that can effectively reduce noise.

  The first aspect of the biological sound acquisition device of the present invention includes a main body, an acquisition unit that acquires biological sound, and a first member that holds the acquisition unit in an internal space of the main body, and the main body A first connecting part that connects the first surface of the first member and the external space of the main body, and a second surface of the first member that is different from the first surface and the external space. A second connecting part.

FIG. 1 is a block diagram showing the overall configuration of the electronic stethoscope of the present embodiment. FIG. 2 is a cross-sectional view showing a cross section of the chest piece. FIG. 3 is a perspective view showing the appearance of the vibration detection module. 4A is a cross-sectional view taken along the line A-A ′ in FIG. 2, and FIG. 4B is a cross-sectional view taken along the line B-B ′ in FIG. 2. FIG. 5 is a conceptual diagram showing how noise transmitted to the front and back surfaces of the diaphragm is canceled. FIG. 6 is a conceptual diagram showing how noise transmitted to the front and back surfaces of the vibration damping damper is canceled out. FIG. 7 is a graph showing a difference in noise intensity depending on the presence / absence of a communication hole. FIG. 8 is a cross-sectional view showing a cross section of a chest piece of a modified example of an electronic stethoscope.

Hereinafter, embodiments of the biological sound acquisition apparatus will be described.
<1>

  An embodiment of the biological sound acquisition device includes a main body part, an acquisition part that acquires biological sound, and a first member that holds the acquisition part in an internal space of the main body part, and the main body part includes the first part. A first connecting portion for connecting the first surface of the member and the external space of the main body, and a second connecting portion for connecting the second surface of the first member different from the first surface and the external space. Have

According to the first embodiment of the biological sound acquisition device, noise generated in the external space of the main body portion is transmitted to the first surface of the first member via the first communication portion (further, the internal space of the main body portion). Is done. Further, the noise generated in the external space of the main body is transmitted to the second surface of the first member via the second connecting portion (further, the internal space of the main body). That is, noise is transmitted to the first member from each of the first surface and the second surface. For this reason, the noise transmitted to the first surface and the noise transmitted to the second surface cancel each other. As a result, noise transmitted to the first member is reduced. Accordingly, noise transmitted to the acquisition unit via the first member is reduced. For this reason, the noise which an acquisition part acquires can be reduced effectively. In other words, the embodiment of the body sound acquisition apparatus can acquire body sound suitably while reducing noise.
<2>

In another aspect of the embodiment of the biological sound acquisition device described above, the first communication unit can transmit noise generated in the external space to the first surface, and the second communication unit transmits the noise to the first surface. It can be transmitted to the second surface.
According to this aspect, the noise transmitted to the first surface and the noise transmitted to the second surface cancel each other. Therefore, the above-described effects can be properly enjoyed.
<3>
In another aspect of the embodiment of the biological sound acquisition device described above, at least one of the first communication part and the second communication part includes a hole formed in the main body part.

According to this aspect, the noise is relatively efficiently transmitted from the external space to the first member through the hole (and further, the internal space) formed in the main body. Therefore, the above-described effects can be properly enjoyed.
<4>
In another aspect of the embodiment of the biological sound acquisition device described above, at least one of the first communication part and the second communication part includes a partition wall part thinner than the other part of the main body part.

According to this aspect, the noise is relatively efficiently transmitted from the external space to the first member via the relatively thin partition wall (and the internal space) formed in the main body. Therefore, the above-described effects can be properly enjoyed.
<5>
In another aspect of the embodiment of the biological sound acquisition device described above, the first member includes a damper having elasticity.

According to this aspect, the 1st member can hold | maintain an acquisition part so that a vibration of an acquisition part may be suppressed using a damper. Nevertheless, noise transmitted to the acquisition unit via the first member (in particular, the damper) is reduced. Therefore, the above-described effects can be properly enjoyed.
<6>

  In another aspect of the embodiment of the biological sound acquisition device described above, the acquisition unit includes a third member that is in contact with or close to the living body, a second member having a fourth surface different from the third surface, and the fourth member. And a detector that can detect the biological sound by detecting the movement of the second member according to the biological sound and held by the second member on the surface, and the main body includes the fourth surface and the external It has the 3rd communication part which connects the space.

  According to this aspect, the noise generated in the external space of the main body is transmitted to the fourth surface of the second member via the third connecting portion (further, the internal space of the main body). On the other hand, since the third surface of the second member is in contact with or close to the living body, the noise is transmitted to the third surface of the second member through the external space or the living body. That is, noise is transmitted to the second member from each of the third surface and the fourth surface. For this reason, the noise transmitted to the third surface and the noise transmitted to the fourth surface cancel each other. As a result, noise transmitted to the second member is reduced. Accordingly, noise transmitted to the acquisition unit via the second member is reduced. For this reason, the noise which an acquisition part acquires can be reduced effectively.

  In particular, according to researchers such as the inventors of the present application, it has been found that most of noise is transmitted to the acquisition unit via the person to be measured (that is, the living body). That is, it has been found that most of the noise is transmitted to the acquisition unit via the third surface of the second member that is in contact with or close to the measurement subject (that is, the living body). For this reason, there is a possibility that the noise cannot be sufficiently reduced with the apparatus described in Patent Document 1 described above, which merely reduces the noise transmitted from the side of the measurer such as a doctor. However, in this aspect, noise that may be transmitted to the acquisition unit via the third surface of the second member that is in contact with or close to the living body is canceled by noise transmitted to the fourth surface of the second member. The For this reason, the biological sound acquisition device of this aspect is more useful in that the noise acquired by the acquisition unit can be effectively reduced as compared with the device described in Patent Document 1.

Nevertheless, the body sound to be acquired by the body sound acquisition device is transmitted to the third surface of the second member via the living body, but is not transmitted to the fourth surface of the second member. For this reason, the body sound is not canceled by the second member, and the acquisition unit detects the movement (typically vibration) of the second member according to the body sound using the detector. A biological sound can be acquired appropriately.
<7>

  As described above, in another aspect of the biological sound acquisition device including the second member, the acquisition unit includes a third surface that is in contact with or close to the living body, and a second member having a fourth surface different from the third surface. A detector that is held by the second member on the fourth surface and that can detect the biological sound by detecting the movement of the second member according to the biological sound, and the first communication unit further includes: The fourth surface and the external space are brought into communication with each other.

  According to this aspect, the noise generated in the external space of the main body is transmitted to the fourth surface of the second member via the first connecting portion (further, the internal space of the main body). On the other hand, as described above, the noise is transmitted to the third surface of the second member via the external space or the living body. For this reason, the noise transmitted to the third surface and the noise transmitted to the fourth surface cancel each other. For this reason, the noise which an acquisition part acquires can be reduced effectively.

Nevertheless, the body sound to be acquired by the body sound acquisition device is transmitted to the third surface of the second member via the living body, but is not transmitted to the fourth surface of the second member. For this reason, as above-mentioned, the acquisition part can acquire a biological sound appropriately.
<8>
As described above, in another aspect of the biological sound acquisition device including the second member, the second member includes a diaphragm.

  According to this aspect, the above-described effects can be appropriately enjoyed in the biological sound acquisition device that detects (that is, acquires) the biological sound by detecting the movement of the diaphragm according to the biological sound.

  As described above, the embodiment of the biological sound acquisition device includes the main body, the acquisition unit, and the first member, and the first member includes the first communication unit and the second communication unit. Therefore, the embodiment of the biological sound acquisition device can effectively reduce noise.

Then, the Example of the biological sound acquisition apparatus of this invention is described. Below, description is advanced using the electronic stethoscope 1 with which the Example of the biological sound acquisition apparatus of this invention was applied.
(1) Overall Configuration of Electronic Stethoscope 1 First, the overall configuration of the electronic stethoscope 1 of this embodiment will be described with reference to FIG. FIG. 1 is a block diagram showing the overall configuration of the electronic stethoscope 1 of the present embodiment.

  As shown in FIG. 1, an electronic stethoscope 1 that is a specific example of the “body sound acquisition device” in the above-described embodiment includes a vibration sensor 11 that is a specific example of the “detector” in the above-described embodiment, A band-pass filter 12, a cutoff frequency adjusting unit 13, a power amplifier 14, a volume adjusting unit 15, and an earphone 16 are provided.

  The vibration sensor 11 is a sensor that can acquire a body sound (for example, a breathing sound) emitted from the living body 200. In the present embodiment, the vibration sensor 11 acquires a biological sound by detecting a vibration (in other words, displacement) of a diaphragm 211 (described later) generated due to the biological sound. An example of such a vibration sensor 11 is an acceleration sensor. A biological sound signal indicating the biological sound acquired by the vibration sensor 11 is output to the bandpass filter 12. The bandpass filter 12 is a filter that allows only a signal component in a desired frequency band to pass through the biological sound signal input from the vibration sensor 11. The cut-off frequency cut off by the bandpass filter 12 is adjusted by the cut-off frequency adjusting unit 13. The biological sound signal that has passed through the bandpass filter 12 is output to the power amplifier 14. The power amplifier 14 changes the intensity of the biological sound signal according to the set gain. The gain of the power amplifier 14 is adjusted by the volume adjustment unit 15. The biological sound signal that has passed through the power amplifier 14 is output to the earphone 16. The earphone 16 outputs a biological sound indicated by the biological sound signal as a sound.

The vibration sensor 11 is accommodated in the chest piece 2 of the electronic stethoscope 1. The chest piece 2 is a component pressed against the living body 200 for auscultation. In the present embodiment, the chest piece 2 can reduce noise acquired by the vibration sensor 11 (that is, a sound different from the biological sound to be acquired, for example, environmental sounds such as surrounding speech). It has a structure. Hereinafter, the structure of the chest piece 2 will be further described. In addition to the vibration sensor 11, at least one of the bandpass filter 12, the cutoff frequency adjusting unit 13, the power amplifier 14, and the volume adjusting unit 15 may be accommodated in the chest piece 2.
(2) Structure of chest piece 2 of electronic stethoscope 1

  Next, the structure of the chest piece 2 of the electronic stethoscope 1 will be described with reference to FIGS. 2 to 3 and FIGS. 4 (a) and 4 (b). FIG. 2 is a cross-sectional view showing a cross section of the chest piece 2. FIG. 3 is a perspective view showing an appearance of the vibration detection module 21 included in the chest piece 2. 4A is a cross-sectional view taken along the line A-A ′ in FIG. 2, and FIG. 4B is a cross-sectional view taken along the line B-B ′ in FIG. 2.

  As shown in FIG. 2, the chest piece 2 is a vibration detection module 21 that is a specific example of the “acquisition unit” in the above-described embodiment, and a defense that is a specific example of the “first member” in the above-described embodiment. The vibration damper 22 and a housing 23 which is a specific example of the “main body” in the above-described embodiment are provided. In addition to the vibration sensor 11 described above, the vibration detection module 21 includes a diaphragm (that is, a vibration film) 211 that is a specific example of the “second member” in the above-described embodiment, and a module case 212.

  The vibration sensor 11 is held on the back surface 211 a of the diaphragm 211. The front surface 211b (that is, the surface opposite to the back surface 211a) of the diaphragm 211 is a surface that can contact or approach the living body 200 during auscultation. The diaphragm 211 is made of silicone rubber, urethane rubber, or the like. The outer edge of the back surface 211 a of the diaphragm 211 is fixed to the lower end of the cylindrical module case 212. For this reason, the vibration sensor 11 is accommodated in a space surrounded by the back surface 211 a of the diaphragm 211 and the inner surface of the module case 212. The surface 211b of the diaphragm 211 is a specific example of the “third surface” in the above-described embodiment, and the back surface 211a of the diaphragm 211 is a specific example of the “fourth surface” in the above-described embodiment.

  As shown in FIG. 3 in addition to FIG. 2, a communication hole 213 is formed in the top surface of the module case 212. The communication hole 213 communicates the back surface 211a of the diaphragm 211 and the external space of the module case 212 (for example, the internal space of the housing 23 in which the vibration detection module 21 is accommodated). As a result of the communication hole 213 connecting the back surface 211a and the external space of the module case 212, sound can be transmitted from the external space of the module case 212 to the back surface 211a. For example, sound (for example, noise) generated in the external space of the module case 212 or transmitted to the external space of the module case 212 through the communication hole 213 can be transmitted to the back surface 211a. That is, the communication hole 213 is formed in the module case 212 in order to transmit sound from the external space of the module case 212 to the back surface 211a. Therefore, “contacting the external space of the module case 212 and the back surface 211a of the diaphragm 211” in the present embodiment means that “the sound (for example, noise) generated in the external space of the module case 212 is transmitted to the back surface 211a of the diaphragm 211. Is substantially equivalent to “transmit”.

  Furthermore, the communication hole 213 guides a signal line for transmitting a biological sound signal output from the vibration sensor 11 to the outside of the vibration detection module 21 (for example, a signal processing device such as the bandpass filter 12). It also has a function.

  In FIG. 2 again, the vibration detection module 21 is fixed to the housing 23 by an anti-vibration damper 22 having elasticity. That is, the vibration detection module 21 is supported by the anti-vibration damper 22 without contacting the housing 23. For example, useless vibration (that is, noise) may occur in the housing 23 when the person to be measured or the measurement person touch the housing 23. However, transmission of unnecessary vibration to the vibration detection module 21 is suppressed by the vibration isolation damper 22.

  As shown in FIG. 4A in addition to FIG. 2, the housing 23 has a specific example of each of the “first contact portion” and the “third contact portion” in the embodiment described above. A plurality of communication holes 231 which are examples are formed. In particular, the plurality of communication holes 231 are preferably formed on one side (upper side in the example shown in FIG. 2) of the connection portion 22c between the vibration damping damper 22 and the housing 23. Each communication hole 231 communicates the external space of the housing 23 and the internal space of the housing 23.

  Since the vibration damping damper 22 is accommodated in the internal space of the housing 23, each communication hole 231 communicates the external space of the housing 23 with the vibration damping damper 22 (particularly, the back surface 22a). As a result of each communication hole 231 connecting the external space of the housing 23 and the back surface 22a, sound can be transmitted from the external space of the housing 23 to the back surface 22a. For example, sound (for example, noise) generated in the external space of the housing 23 can be transmitted to the back surface 22a through each communication hole 231. That is, each communication hole 231 is formed in the housing 23 in order to transmit sound from the external space of the housing 23 to the back surface 22a. Accordingly, “contacting the external space of the housing 23 and the rear surface 22a of the vibration damping damper 22” in the present embodiment means that “the sound (for example, noise) generated in the external space of the housing 23 is damped. This is substantially equivalent to “transmitting to the back surface 22a of”.

  Since the vibration detection module 21 is accommodated in the internal space of the housing 23 and the communication hole 213 communicates the back surface 211 a of the diaphragm 211 and the external space of the module case 212, each communication hole 231 is connected to the housing 23. The outer space of the diaphragm 211 and the rear surface 211a of the diaphragm 211. As a result of each communication hole 231 connecting the external space of the housing 23 and the back surface 211a, sound can be transmitted from the external space of the housing 23 to the back surface 211a. For example, sound (for example, noise) generated in the external space of the housing 23 can be transmitted to the back surface 211a through each communication hole 231. That is, each communication hole 231 is formed in the housing 23 in order to transmit sound from the external space of the housing 23 to the back surface 211a. Therefore, “contacting the external space of the housing 23 and the back surface 211a of the diaphragm 211” in the present embodiment means that “sound (for example, noise) generated in the external space of the housing 23 is transmitted to the back surface 211a of the diaphragm 211. Is substantially equivalent to “transmit”.

  Further, as shown in FIG. 4B in addition to FIG. 2, the housing 23 has a plurality of communication holes, each of which is a specific example of the “second communication portion” in the above-described embodiment. 232 is formed. In particular, the plurality of communication holes 232 are preferably formed on the other side (lower side in the example shown in FIG. 2) than the connection portion 22 c between the vibration damping damper 22 and the housing 23. Each communication hole 232 communicates the external space of the housing 23 and the internal space of the housing 23. Since the vibration damping damper 22 is disposed in the internal space of the housing 23, each communication hole 232 communicates the external space of the housing 23 with the vibration damping damper 22 (particularly, the surface 22b). As a result of the communication holes 232 connecting the outer space of the housing 23 and the surface 22b, sound can be transmitted from the outer space of the housing 23 to the surface 22b. For example, sound (for example, noise) generated in the external space of the housing 23 can be transmitted to the surface 22b through each communication hole 232. That is, each communication hole 232 is formed in the housing 23 in order to transmit sound from the external space of the housing 23 to the surface 22b. Therefore, “contacting the external space of the housing 23 and the surface 22b of the vibration damping damper 22” in the present embodiment means that “the sound (for example, noise) generated in the external space of the housing 23 is damped. It is substantially equivalent to “transmitting to the surface 22b of”.

In the example shown in FIG. 4A, the communication hole 231 is formed in eight directions with the vibration sensor 11 as the center. However, any number of communication holes 231 may be formed at any location of the housing 23. If a plurality of communication holes 231 are formed, the external space of the housing 23 and the internal space of the housing 23 are communicated with each other in a plurality of different directions as viewed from the vibration sensor 11. Further, even when the measurement person grips the housing 23 and some of the communication holes 231 are blocked, the external space of the housing 23 and the internal space of the housing 23 are communicated via the other communication holes 231. Can be maintained. As for the communication holes 232, any number of communication holes 232 may be formed at any location of the housing 23, similarly to the communication holes 231.
(3) Reduction effect of noise acquired by the vibration sensor 11

  Next, technical effects that can be enjoyed by the electronic stethoscope 1 of this embodiment (that is, noise reduction effects acquired by the vibration sensor 11) will be described with reference to FIGS. FIG. 5 is a conceptual diagram showing how noise transmitted to the back surface 211a and the front surface 211b of the diaphragm 211 is canceled. FIG. 6 is a conceptual diagram showing how noise transmitted to the back surface 22a and the front surface 22b of the vibration damping damper 22 is canceled.

  As shown in FIG. 5, the living body 200 transmits noise (for example, environmental sound, particularly noise in the external space of the housing 23) to the surface 211 b of the diaphragm 211 together with the body sound to be acquired. For this reason, if no measures are taken, the diaphragm 211 will vibrate not only from a body sound but also from noise. As a result, a lot of noise is acquired by the vibration sensor 11 in the body sound. For this reason, there exists a possibility that the diagnosis based on a body sound cannot be performed correctly. However, in this embodiment, as already described, the communication hole 213 is formed in the module case 212 and the communication hole 231 is formed in the housing 23. Therefore, as shown in FIG. 5, the noise is also transmitted to the back surface 211 a of the diaphragm 211 through the communication holes 231 and 213. As a result, the same noise is transmitted to the front surface 211b and the back surface 211a of the diaphragm 211 in the same phase. For this reason, noise is canceled on the diaphragm 211. That is, the vibration of the diaphragm 211 caused by noise is weakened. Therefore, the noise acquired by the vibration sensor 11 is reduced.

  On the other hand, the body sound is transmitted from the front surface 211b of the diaphragm 211, but not transmitted from the back surface 211a of the diaphragm 211. For this reason, unlike noise, biological sound is not canceled on the diaphragm 211. That is, the body sound is acquired by the vibration sensor 11. As a result, the vibration sensor 11 can suitably acquire a biological sound in a state where noise is reduced.

  Furthermore, as shown in FIG. 6, the noise transmitted from the external space of the housing 23 to the internal space 23 of the housing 23 through the communication hole 231 is not only the back surface 211 a of the diaphragm 211 but also the vibration damping damper 22. It is also transmitted to the back surface 22a. For this reason, if no countermeasure is taken, the vibration damping damper 22 vibrates due to noise transmitted through the communication hole 231. As a result, since the diaphragm 211 also vibrates with the vibration of the vibration damping damper 22, a lot of noise is acquired by the vibration sensor 11 mixed with the body sound. For this reason, there exists a possibility that the diagnosis based on a body sound cannot be performed correctly. However, in this embodiment, as described above, the housing 23 is formed with the communication hole 232 in addition to the communication hole 231. For this reason, as shown in FIG. 6, the noise is also transmitted to the back surface 22 a of the vibration isolation damper 22 through the communication hole 232. As a result, the same noise is transmitted in the same phase to each of the front surface 22b and the back surface 22a of the vibration damping damper 22. For this reason, noise is canceled on the vibration-proof damper 22. That is, the vibration of the vibration damping damper 22 due to noise (and vibration of the diaphragm 211) is weakened. Therefore, the noise acquired by the vibration sensor 11 is reduced.

  In order to specifically verify the noise reduction effect, the inventor of the present application measured the sound obtained when the chestpiece 2 was pressed against the living body 200 in a state where white noise was output from an external speaker. Went. FIG. 7 shows the sound intensity obtained by the experiment (that is, the vibration intensity of the diaphragm 211, and substantially the acceleration of the diaphragm 211). Specifically, in FIG. 7, the thin solid line indicates the intensity of sound acquired by the chest piece in which all of the communication holes 213, 231, and 232 are closed for each frequency. Furthermore, in FIG. 7, the thin dotted line indicates the intensity of sound acquired by the chest piece in which only the communication hole 232 is blocked (that is, the communication holes 213 and 231 are secured) by frequency. Furthermore, in FIG. 7, a thick solid line shows the intensity of the sound acquired by the chest piece 2 in which the communication holes 213, 231 and 232 are secured by frequency.

  As shown in FIG. 7, compared to the sound intensity acquired when all of the communication holes 213, 231 and 232 are blocked, the sound intensity acquired when only the communication hole 232 is blocked (i.e., It was proved that the vibration intensity and acceleration were small. That is, it has been demonstrated that the noise acquired by the vibration sensor 11 can be effectively reduced by forming the communication hole 213 in the module case 212 and the communication hole 231 in the housing 23.

  On the other hand, when focusing on the sound component of 1000 Hz or higher, compared to the intensity of the sound component of 1000 Hz or higher acquired when all of the communication holes 213, 231 and 232 are blocked, only the communication hole 232 is blocked. It turns out that the intensity | strength of the acquired sound component of 1000 Hz or more is not so small. In particular, the intensity of the sound component of 1500 Hz or higher acquired when only the communication hole 232 is blocked, compared to the intensity of the sound component of 1500 Hz or higher acquired when all of the communication holes 213, 231, and 232 are blocked. On the contrary, you can see that it has grown. One reason for this is that the vibration sensor 11 has acquired vibration (that is, vibration due to noise) generated in the vibration damping damper 22 due to the communication hole 232 being blocked. is there.

In the present embodiment, as described above, the formation of the communication hole 232 suppresses the vibration generated in the vibration damping damper 22 due to noise. Specifically, as shown in FIG. 7, when focusing on the sound component of 1000 Hz or less, compared to the intensity of the sound component of 1000 Hz or more acquired when all of the communication holes 213, 231 and 232 are blocked, It can be seen that the intensity of the sound component of 1000 Hz or higher acquired when all of the communication holes 213, 231 and 232 are secured is reduced. Further, even if attention is focused on a sound component of 1000 Hz or higher, the communication holes 213, 231, and 143 are compared with the intensity of a sound component of 1000 Hz or higher (particularly 1500 Hz or higher) acquired when only the communication hole 232 is blocked. It can be seen that the intensity of the sound component of 1000 Hz or higher (particularly 1500 Hz or higher) acquired when all of 232 are secured is reduced. That is, it was demonstrated that the noise acquired by the vibration sensor 11 can be further effectively reduced by forming the communication hole 232 in the housing 23 in addition to the communication holes 213 and 231.
(4) Modification

  In the above description, the housing 23 is formed with the communication hole 232 for transmitting the noise in the external space of the housing 23 to the surface 22 b of the vibration damping damper 22. However, as shown in FIG. 8, instead of (or in addition to) the communication hole 232, the housing 23 has a partition wall for transmitting noise in the external space of the housing 23 to the surface 22 b of the vibration damping damper 22. A portion 233 may be formed. The thickness of the partition wall portion 233 is thinner than the thickness of the casing 23 other than the partition wall portion 233. For this reason, even in the case where the partition wall 233 is formed in addition to or instead of the communication hole 232, compared with the case where the partition wall 233 is not formed, the noise in the external space of the housing 23 is It is efficiently transmitted to the surface 22b of the vibration damping damper 22 through the partition wall 233. Therefore, the same effects as those described above can be enjoyed. In the same manner, the communication hole 231 is used to transmit noise in the external space of the housing 23 to the back surface 22a of the vibration damping damper 22 or the back surface 211a of the diaphragm 211 instead of (or in addition to) the communication hole 231. A relatively thin partition wall may be formed. Similarly, the communication hole 213 is formed with a relatively thin partition wall for transmitting noise in the external space of the module case 212 to the back surface 211a of the diaphragm 211 instead of (or in addition to) the communication hole 213. May be.

  A moisture permeable waterproof sheet may be disposed in at least one of the communication holes 213, 231, and 232. The moisture permeable waterproof sheet has a characteristic of allowing air to pass while not passing water. For this reason, the waterproof function of the chestpiece 2 can be exhibited while enjoying the noise reduction effect. That is, noise can be canceled and reduced, and the reliability of the electronic stethoscope 1 can be improved.

  The entire internal space (or part) of the module case 212 including the communication hole 213 may be filled with an elastic body. The elastic body may be made of, for example, silicone. If comprised in this way, the penetration | invasion of the water into the internal space of the module case 212 (namely, permeation of the water into the vibration sensor 11) can be prevented more reliably. Noise is also transmitted to the back surface 211a of the diaphragm 211 via an elastic body.

  In the above description, each communication hole 231 connects the external space of the housing 23 and the back surface 211a of the diaphragm 211, and connects the external space of the housing 23 and the back surface 22a of the vibration damping damper 22. It is. However, a communication hole 231 for mainly connecting the outer space of the housing 23 and the back surface 211a of the diaphragm 211, and a communication hole 231 for mainly connecting the external space of the housing 23 and the back surface 22a of the vibration damping damper 22 are provided. And may be formed separately and independently.

  The vibration detection module 212 may not have the communication hole 213 formed therein. Even in this case, as long as the communication holes 231 and 232 are formed, the same noise is transmitted to the front surface 22b and the back surface 22a of the vibration damping damper 22 in the same phase. For this reason, even when the communication hole 213 is not formed, the noise acquired by the vibration sensor 11 can be reduced as compared with the case where all of the communication holes 213, 231 and 232 are not formed.

  The present invention is not limited to the above-described embodiment, and can be appropriately changed without departing from the gist or concept of the invention that can be read from the claims and the entire specification. The apparatus is also included in the technical scope of the present invention.

DESCRIPTION OF SYMBOLS 1 Electronic stethoscope 11 Vibration sensor 2 Chest piece 21 Vibration detection module 211 Diaphragm 212 Module case 213 Communication hole 22 Anti-vibration damper 23 Case 231 Communication hole 232 Communication hole 233 Partition part

Claims (8)

The main body,
An acquisition unit for acquiring a body sound;
A first member that holds the acquisition unit in the internal space of the main body,
The main body includes a first connecting portion that connects a first surface of the first member and an external space of the main body, a second surface of the first member that is different from the first surface, and the external space. A biological sound acquisition apparatus comprising: a second communication unit that communicates The first communication unit can transmit noise generated in the external space to the first surface;
The biological sound acquisition apparatus according to claim 1, wherein the second communication unit is capable of transmitting the noise to the second surface. The biological sound acquisition apparatus according to claim 1, wherein at least one of the first communication part and the second communication part includes a hole formed in the main body part. The biological sound according to any one of claims 1 to 3, wherein at least one of the first communication part and the second communication part includes a partition wall part thinner than the other part of the main body part. Acquisition device. The biological sound acquisition apparatus according to any one of claims 1 to 4, wherein the first member includes a damper having elasticity. The acquisition unit includes a third member that is in contact with or close to the living body, a second member having a fourth surface different from the third surface, and is held by the second member on the fourth surface and responds to the body sound. A detector capable of detecting the body sound by detecting the movement of the second member,
The body sound acquisition device according to any one of claims 1 to 5, wherein the main body portion includes a third connecting portion that connects the fourth surface and the external space. The acquisition unit includes a third member that is in contact with or close to the living body, a second member having a fourth surface different from the third surface, and is held by the second member on the fourth surface and responds to the body sound. A detector capable of detecting the body sound by detecting the movement of the second member,
The biological sound acquisition apparatus according to any one of claims 1 to 6, wherein the first communication unit further connects the fourth surface and the external space. The biological sound acquisition apparatus according to claim 6 or 7, wherein the second member includes a diaphragm.