WO2008010551A1

WO2008010551A1 - Body motion measurement device

Info

Publication number: WO2008010551A1
Application number: PCT/JP2007/064266
Authority: WO
Inventors: Takehiko Hiei; Kazuhisa Shigemori
Original assignee: Daikin Industries, Ltd.
Priority date: 2006-07-21
Filing date: 2007-07-19
Publication date: 2008-01-24
Also published as: JP2008023118A

Abstract

A body motion measurement device for measuring motion of the body of a subject. Failures in a pressure detection section is minimized and discarding of the pressure detection section together with a pressure sensing section in replacement of the pressure sensing section is prevented. The body motion measurement device (10) has a hollow pressure sensing tube (21) deforming with motion of the subject's body to change the pressure inside the tube, a hollow pressure transmission tube (22) for propagating a pressure change in the pressure sensing tube (21), and a body section (30) to which the pressure transmission tube (22) is connected, having a pressure receiving sensor (33) for detecting the pressure change, and detecting by the pressure receiving sensor (33) the pressure change in the pressure sensing tube (21) transmitted by the pressure transmission tube (22) to measure motion of the body of the subject.

Description

Specification

Body movement measuring device

Technical field

[0001] The present invention relates to a body movement measuring apparatus for measuring body movement of a subject.

Background art

[0002] Conventionally, there has been known a body movement measuring device that measures the body movement of a subject using a hollow pressure-sensitive part that deforms with the body movement of the subject and changes the internal pressure! /, The

[0003] For example, a body movement measuring device disclosed in Patent Document 1 includes a plurality of elastically deformable pressure-sensitive tubes as pressure-sensitive portions, a collecting tube portion to which the plurality of pressure-sensitive tubes are connected, A pressure detection unit provided at a proximal end portion of the collecting pipe unit; and a controller electrically connected to the pressure detection unit via a wire harness. Specifically, the plurality of pressure-sensitive tubes are installed in bedding such as a bed, and include body movements of a subject lying on the bedding (including fine body movements caused by breathing and heartbeats and coarse body movements caused by rolling over). ) Fluctuates the pressure in the pressure sensitive tube. The pressure fluctuation in the pressure-sensitive tube is converted into an electrical signal by the pressure detector provided in the collecting pipe. Then, this signal is input to the controller via the wire harness, and the body movement of the subject is measured by the controller.

Patent Document 1: Japanese Unexamined Patent Publication No. 2006-14809

Disclosure of the invention

Problems to be solved by the invention

By the way, in the conventional body movement measuring apparatus, the controller is installed at a position away from the subject to sleep, such as a side table. In general, the device body such as a controller is handled carefully so as not to give an impact. On the other hand, the pressure detection unit is provided apart from the controller, and is not as polite as the controller, and there is a tendency that some impact is allowed as in the case of the pressure sensitive tube. Further, since the pressure detection unit is provided in the collecting pipe unit, that is, is installed in the vicinity of the subject who goes to sleep, for example, the arm or foot of the subject who sleeps hits and receives an impact. There is a possibility. As a result, the pressure detection unit may break down.

[0005] Furthermore, since the pressure detection unit is configured to be detachable from the controller by disconnecting the wire harness from the controller, the pressure detection unit is also used together with the pressure sensing tube when the pressure sensing tube is replaced. There was a risk of being discarded.

[0006] The present invention has been made in view of the force and the point, and an object of the present invention is to suppress the failure of the pressure detection unit and to change the pressure detection unit when the pressure detection unit is replaced. It is to prevent it from being discarded together.

Means for solving the problem

[0007] The present invention provides a pressure detection section (33) in the apparatus main body (30), and the pressure in the pressure sensing section (21) between the pressure sensing section (21) and the apparatus body (30). A pressure propagation part (22) for propagating the fluctuation to the apparatus main body (30) is provided.

[0008] Specifically, the first invention is directed to a body movement measuring device, and includes a hollow pressure-sensitive part (21) that deforms in accordance with the body movement of the subject and changes its internal pressure, and the above-mentioned feeling. Connected to the pressure part (21), and has a hollow pressure propagation part (22) for propagating pressure fluctuations in the pressure sensitive part (21), and a pressure detection part (33) for detecting pressure fluctuations The pressure propagation part (22) is connected to the body, and the pressure detection part (33) detects the pressure fluctuation in the pressure sensitive part (21) propagated by the pressure propagation part (22). And a device body (30) for measuring movement.

[0009] In the case of the above configuration, the pressure detector (33) is handled together with the apparatus main body (30) by providing the pressure detector (33) in the apparatus main body (30). That is, since the pressure detection unit (33) is carefully handled together with the apparatus main body (30) so as not to give an impact or the like, the failure of the pressure detection unit (33) can be suppressed. In addition, the pressure detector (33) is provided in the device body (30) to prevent the pressure detector (33) from being discarded together with the pressure sensor (21) when the pressure sensor (21) is replaced. The power to do S.

[0010] Here, in the configuration in which the pressure detection unit (33) is provided in the device main body (30), the pressure sensing unit (21) is extended to the device main body (30) and directly connected to the device main body (30). Configuration is conceivable. In the first place, the pressure-sensing part (21) is designed to detect pressure fluctuations with high sensitivity, mainly to detect the body movement of the subject. However, in the configuration in which the pressure sensitive part (21) is directly connected to the device main body (30), the detected pressure fluctuation is efficiently transmitted to the device main body (30). Carrying! /, The function is also required for the pressure sensitive part (21). Then, it is necessary to design the pressure sensitive part (21) to satisfy two different requirements of pressure fluctuation detection and pressure fluctuation propagation, and both requirements must be designed in a balanced manner by trade-off. Disappear

Therefore, in the present invention, in the configuration in which the pressure detection unit (33) is provided in the device main body (30), the pressure sensing unit (21) is not directly connected to the device main body (30) ( 21) and a pressure propagation part (22) for connecting the apparatus main body (30) are provided separately. By doing so, the pressure sensitive part (21) can be designed to detect pressure fluctuations, and the pressure propagation part (22) can be designed to focus on pressure fluctuations. As a result, it is possible to realize a body motion measuring apparatus that can detect pressure fluctuation with high sensitivity and can efficiently propagate the pressure fluctuation to the apparatus main body (30).

[0012] In a second aspect based on the first aspect, the pressure sensitive part (21) and the pressure propagation part (22)

These are each a tubular member.

In the case of the above configuration, the shapes of the pressure sensitive part (21) and the pressure propagation part (22) are specifically specified.

[0014] In the first aspect of the invention, the pressure propagation part (22) is a tubular member having an inner diameter force S1mm of 2 mm.

[0015] When the pressure propagation part (22) is connected to the pressure sensitive part (21), the entire volume increases by the pressure propagation part (22). When a certain amount of air is pushed away from the pressure sensitive part (21) by the pressure propagating part (22), the larger the volume of the pressure propagating part (22), the more the pressure propagates against a certain amount of air pushed away. The amplitude of the sound wave transmitted through the section (22) is reduced. That is, if the inner diameter of the pressure propagation part (22) is too large, the amplitude of the sound wave transmitted through the pressure propagation part (22) becomes small.

On the other hand, the sound wave is attenuated along with the propagation due to the loss when propagating through the pressure propagation part (22), and the amount of attenuation increases as the inner diameter of the pressure propagation part (22) decreases. In other words, if the inner diameter of the pressure propagation part (22) is too small, pressure fluctuations may not be propagated to the device body (30).

[0017] Thus, as a result of earnest research, the present invention has found that the optimum inner diameter force of the pressure propagation part (22) S l _mm 2mm I found out. In other words, by setting the inner diameter of the pressure propagation part (22) to 1 mm to 2 mm, the pressure fluctuation attenuation can be suppressed and the pressure fluctuation of the pressure sensitive part (21) can be efficiently propagated to the device body (30). it can.

The invention's effect

[0018] According to the present invention, by providing the pressure detector (33) in the apparatus main body (30), the pressure detector (33) is carefully handled together with the apparatus main body (30) to prevent failure. In addition, it is possible to prevent the pressure detector (33) from being discarded together with the pressure sensitive part (21) when the pressure sensitive part (21) is replaced. Further, when the pressure detection unit (33) is provided together with the device main body (30), the pressure in the pressure sensing unit (21) is between the pressure sensing unit (21) and the device main body (30). By providing a pressure propagation part (22) for propagating fluctuations to the device body (30), the pressure sensitive part (21) is designed mainly to detect the body movement of the subject with high sensitivity. The pressure propagation part (22) can be designed mainly to propagate the pressure fluctuation efficiently. In other words, the pressure sensing unit (21) and the pressure propagation unit (22) can be designed specifically for their respective roles, and the body motion measurement device as a whole can be used to detect body motion detection sensitivity and pressure fluctuation. Both propagation efficiency can be improved.

[0019] According to the third invention, by setting the inner diameter of the pressure propagation part (22) to lmm to 2mm, the loss when the sound wave propagates through the pressure propagation part (22) is reduced, and the pressure fluctuation Can be efficiently propagated to the device main body (30).

Brief Description of Drawings

FIG. 1 is a schematic diagram showing a usage state of a body movement measuring device according to an embodiment of the present invention.

FIG. 2 is a diagram showing a schematic configuration of a body movement measuring apparatus.

FIG. 3 is a block diagram conceptually showing each component of the circuit unit.

FIG. 4 is a graph showing the relationship between the inner and outer diameters of the pressure sensitive tube and the detection sensitivity.

FIG. 5 is a graph showing the relationship between the thickness of the pressure sensitive tube and the detection sensitivity.

FIG. 6 is a graph showing the relationship between the inner diameter of a pressure propagation tube and the amplitude ratio of sound waves before and after propagation when the propagation loss of sound waves is taken into account.

[Fig. 7] Fig. 7 shows the pressure-sensitive tube volume of 1256 when considering the change in volume of the entire tube. The relationship between the inner diameter of the pressure propagation tube and the amplitude ratio of sound waves before and after propagation at 0 mm ³

[Fig. 8] Fig. 8 shows the relationship between the inner diameter of the pressure propagation tube and the amplitude ratio of sound waves before and after propagation when the pressure sensitive tube volume is 2512 0 mm ³ considering the volume change of the entire tube.

[Fig. 9] Fig. 9 shows the ratio between the inner diameter of the pressure propagation tube and the amplitude of the sound wave before and after propagation when the pressure sensing tube volume is 12560 mm ³ taking into account the propagation loss of sound waves and the volume change of the entire tube. It is a graph which shows the relationship.

FIG. 10 is the case of considering the propagation loss and volume change of the entire tube waves, when the pressure sensing tube volume force ¾5120Mm ^3, the amplitude ratio of the wave front and rear propagating to the inner diameter of the pressure propagation tube It is a graph which shows the relationship.

Explanation of symbols

[0021] 10 body movement measuring device

21 Pressure-sensitive tube (pressure-sensitive part)

22 Pressure propagation tube (pressure propagation part)

30 Main unit (device main unit)

33 Pressure sensor (pressure detector)

BEST MODE FOR CARRYING OUT THE INVENTION

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

[0023] The body movement measuring device (10) according to the embodiment of the present invention is for detecting the behavior of body movements that occur from a sleeping person and utilizing these data for the health management of the sleeping person. In other words, this body movement measuring device (10) collects and stores data relating to body movements necessary for determining the sleep state of the sleeping person, and outputs it to another display device (not shown). Is. Therefore, the body movement measuring device (10) includes a sensor unit (20) for detecting the body movement of a sleeping person and a body unit (30) for processing and storing the detected signal. As shown in FIG. 1 and FIG. 2, the sensor part (20) is made of a tube-shaped member, detects pressure applied from the outside, and transmits it to the main body part (30). It is configured. Snow That is, the sensor unit (20) includes a pressure-sensitive tube (21) as a pressure-sensitive unit for detecting vibration associated with body movement of a sleeping person as pressure fluctuation, and the pressure fluctuation to the main body (30). It has a pressure propagation tube (22) as a pressure propagation part for propagation!

[0025] As shown in Figs. 1 and 2, the pressure-sensitive tube (21) is formed of a hollow tube having an elongated shape and a circular cross section. This pressure-sensitive tube (21) is laid under the bedding such as a futon. When the sleeping person lies down on the bedding, pressure 'vibration is transmitted to the pressure-sensitive tube (21) along with the body movement of the sleeping person. The internal pressure of the pressure sensitive tube (21) varies.

[0026] As shown in FIGS. 1 and 2, the pressure propagation tube (22) is formed of a hollow tube having an elongated shape and a circular cross section, and the inner diameter thereof is the inner diameter of the pressure sensitive tube (21). It is set smaller than. One end of the pressure propagation tube (22) is connected to the pressure-sensitive tube (21) via a connection portion (23), and the other end is connected to the main body portion (30). The pressure fluctuation in the pressure sensitive tube (21) is transmitted through the pressure propagation tube (22) and acts on the pressure receiving portion (31) of the main body (30).

[0027] The pressure receiving portion (31) is built in the box-shaped main body portion (30), and has a mounting portion (32) that can be fitted to the other end portion of the pressure propagation tube (22). Have it. The mounting portion (32) faces the inside of the main body (30) in a substantially annular shape so that the other end of the tube-shaped pressure propagation tube (22) is positioned in the main body (30). And a concave portion (32a) that is recessed, and a convex portion (32b) that projects into the other end portion of the pressure propagation tube (22) within the concave portion (32a). The convex portion (32b) is provided with a through hole (32c), and the pressure fluctuation generated in the pressure-sensitive tube (21) is transferred to the pressure receiving portion (31) via the pressure propagation tube (22). It is configured to be transmitted to.

[0028] The pressure receiving portion (31) has a pressure receiving sensor (33) therein. The pressure receiving sensor (33) includes a microphone, a pressure sensor, and the like, receives the internal pressure generated by the pressure-sensitive tube (21), converts the internal pressure into a voltage, and converts the internal body portion ( It is configured to output as a body motion signal to a circuit unit (40) described later in (30). The pressure receiving sensor (33) constitutes a pressure detector.

[0029] The main body (30) is a box-shaped case in which the circuit unit (40) is built, and the body motion measuring device (10) is turned on on the upper surface of the case. Power switch to turn off The illuminance sensor (35) for detecting the ambient illuminance, the power LED (36) that lights up when the power switch (34) is on, and the body movement measuring device (10) There is an error display LED (37) that lights up in the case of V, NA! /, Operating normally. This main body (30) constitutes the apparatus main body.

[0030] In addition to the above, a heartbeat LED and a breathing LED that are lighted and controlled in response to a heartbeat signal associated with the sleeper's heartbeat and a breathing signal associated with breathing are provided, so that the sleeper or the like can properly operate. It may be possible to confirm whether movements such as heartbeat and respiration are detected by the sensor unit (20).

[0031] The illuminance sensor (35) is configured by a phototransistor, a photodiode, or the like so as to detect ambient brightness. The ambient illuminance detected by the illuminance sensor (35) is input as an illuminance signal to the circuit unit (40), for example, and used for luminance correction of the LEDs (36, 37). In the present embodiment, the correction of the brightness of the LED (36, 37) is not described in detail, but when the surroundings are bright, the brightness of the LED (36, 37) is reliably set to high brightness. On the other hand, when the surroundings are dark, it is necessary to reduce the brightness so that the sleep of the sleeper is not disturbed by the lighting of the LED (36, 37).

[0032] The circuit unit (40) extracts, from the body motion signals output from the pressure receiving sensor (33), signals of heart motion components and body motion components other than heartbeat 'respiration, respectively. Based on the components, the bed sleep determination and sleep determination of the sleeping person are performed and stored, and these data are output to a display device (not shown) so that they can be monitored. As shown in FIG. 3, the circuit unit (40) includes a signal processing means (41), a heartbeat extracting means (42), a body motion extracting means (43), a bed leaving judging means (44), a sleep judging means (45 ) And storage means (46)

Yes

[0033] The signal processing means (41) performs oversampling of the body motion signal output from the pressure receiving sensor (33), for example, by 64 times, and then integrates and averages every predetermined time (for example, 10 msec). Equivalent sampling is performed to cancel the noise of the body motion signal.

[0034] The heartbeat extraction means (42) includes an envelope detector! /, And the signal processing means (41) Performs envelope detection processing for body motion signals after being processed in step 1 (hereinafter also referred to as post-processing body motion signals)! \\ It is configured to extract signal components associated with the sleeper's heart rate ! /

[0035] The body motion extraction means (43) extracts a body motion component other than a respiratory component and a heart rate component in the body motion signal, and is different from a respiratory component and a heart rate component with relatively small body motion, It is configured to extract relatively large body movements such as turning over with a filter.

[0036] Although not particularly illustrated, the circuit unit (40) may include a breath extraction means for extracting a breath component from the body motion signal. In this case, the breath extraction means includes a band pass filter, and the body motion signal after the processing is subjected to sleep by the band pass filter (for example, a fourth order filter in a band of 0.6 Hz ± 0.6 Hz). Preferably, it is configured to extract signal components associated with breathing.

[0037] The body motion signal preprocessing method by the signal processing means (41) and the heartbeat signal extraction method by the heartbeat extraction means (42) may be methods other than those described above.

[0038] Based on the heart rate signal obtained by the heart rate extraction means (42), the bed leaving determination means (44) is based on the force of the bedridden lying on the bedding, the bed is removed from the bedding. It is to determine whether or not. The bed leaving determination means (44) stores a bed leaving detection threshold for bed leaving determination, and when a heartbeat signal is input that continuously exceeds the threshold for a predetermined time or more, While it is determined that the person is in the bedding, if the input heartbeat signal does not exceed the threshold value, it is determined that the person is getting out of the bedding. The bed leaving threshold may be a fixed value obtained empirically through experiments or the like, or may be a variable value that is updated as appropriate.

[0039] The sleep determining means (45) further determines the sleeping state of the sleeping person when it is determined by the bed leaving determining means (44) that the sleeping person is in the bed state. The sleep determination means (45) stores a body movement determination threshold value set to a level larger than the above-mentioned bed leaving determination threshold value. This body movement judgment threshold occurs when the sleeper's breathing and heartbeats among the body movement signals associated with the sleeper's body movement, and when the sleeper enters the bed, leaves the bed, or turns over. It is a threshold value which becomes a boundary level with the rough body motion. The body motion determination threshold value may be a fixed value that is empirically obtained through experiments or the like, or the body motion signal, respiratory signal, In addition, the variation value may be updated as appropriate based on the heartbeat signal and the like.

[0040] In this sleep determination means (45), the sleep state of the sleeping person is determined by comparing the body movement component obtained by the body movement extraction means (43) with the body movement determination threshold. Specifically, if the signal level of the body motion signal continuously exceeds the body motion determination threshold for a predetermined time or more, it is considered that the body motion is intermittently generated by the sleeper, so that the sleeper is in the awake state. It is determined that On the other hand, if the body motion signal continuously falls below the body motion determination threshold for a predetermined time or longer, it is considered that intermittent coarse body motion has not occurred, so the sleeper is determined to be in a sleep state. The

[0041] The bed leaving determination means (44) and the sleep determination means (45) determine the bed leaving by dividing the body motion signal input from the pressure receiving sensor (33) every predetermined time (for example, 1 minute). And a sleep determination. For this reason, a sleep result determination result of the sleeping person is obtained at each predetermined time.

[0042] The storage means (46) appropriately stores data relating to the sleeping state of the sleeping person, such as whether the sleeping person is in the sleeping state or the awakening state. Is. Specifically, in the storage means (46), as a judgment result in the bed leaving judgment means (44), the “bed-out” or “bed-in” of the sleeping person is determined by the judgment result in the sleep judgment means (45). The “sleeping state” or “wakefulness state” of a sleeping person in bed is recorded in time series. The storage means (46) uses the time when the judgment is changed from “getting out” to “being in bed” by the bed leaving judgment means (44) as the bed entry time, and the bed leaving judgment means (44). The time when the determination is switched from “being in bed” to “leaving bed” may be configured to be stored as the bed leaving time.

[0043]-Detailed shape of pressure-sensitive tube and pressure propagation tube

Next, detailed shapes of the pressure-sensitive tube (21) and the pressure propagation tube (22) will be described.

[0044] Since the pressure-sensitive tube (21) is installed in the bedding, it is necessary to prevent the sleeping person lying on the bedding from giving a feeling of strangeness. That is, the pressure sensitive tube (21) is required to be soft and not to have an excessively large outer diameter. According to the intensive research of the present inventor, the pressure-sensitive tube (21) is preferably composed of a flexible material such as silicon, chlor chloride, or Tygon. It was found that the outer diameter is preferably 6 mm or less.

[0045] On the other hand, the pressure-sensitive tube (21) is for detecting the body movement of the sleeping person as a pressure fluctuation, and therefore needs to detect the body movement with high sensitivity. Then, the test which measures the detection sensitivity of a pressure sensitive tube (21) was done.

[0046] First, the thickness of the pressure-sensitive tube (21) was fixed at lmm, and the detection sensitivity when the inner and outer diameters of the tube were changed was measured. In this test, the pressure-sensitive tube (21) is made of Tygon. The pressure sensitive tube (21) is installed under the bedding. First, an excitation force having a predetermined frequency and a predetermined magnitude is applied to the pressure-sensitive tube (21) from the bedding. At this time, pressure fluctuation is detected by a pressure receiving sensor installed at one end of the pressure sensitive tube (21). Then, a signal intensity (amplitude) of a predetermined frequency corresponding to the excitation force is measured from the detected signal. This measurement was performed twice for each tube with different inner and outer diameters. The measured values for each tube are normalized by the measured values for tubes with an outer diameter of 6 mm and an inner diameter of 4 mm. The results are shown in Fig. 4.

[0047] As can be seen from the results of FIG. 4, when the thickness of the pressure-sensitive tube (21) is constant, the sensitivity of detecting pressure fluctuations decreases as the inner and outer diameters decrease. This is considered to be because the rigidity of the pressure-sensitive tube (21) increases as the inner and outer diameters of the pressure-sensitive tube (21) become smaller, making it difficult to deform.

[0048] Next, the inner diameter of the pressure-sensitive tube (21) was fixed at 4 mm, and the detection sensitivity was measured when the outer diameter of the tube was changed, that is, when the thickness of the tube was changed. The detection sensitivity is measured in the same way as described above. The results are shown in Fig. 5.

[0049] As can be seen from the results in FIG. 5, when the inner diameter of the pressure-sensitive tube (21) is the same, the sensitivity of detecting pressure fluctuations decreases as the outer diameter decreases. This is presumably because the detection sensitivity decreased as the outer diameter of the pressure-sensitive tube (21) became smaller, because the degree of contact with the bedding became worse (because the contact area was smaller).

[0050] From the above results, the inner and outer diameters of the pressure sensing tube (21) has an outer diameter of 6 mm, an inner diameter 4mm Preferably this and the force ^s Wakakaru.

[0051] Next, the shape of the pressure propagation tube (22) will be examined.

First, the propagation loss of sound waves will be examined. Sound waves propagate through the pressure propagation tube (22). When sowing, it decays with propagation. This sound wave attenuation can be calculated by the following equation.

[0053] [Equation 1]

Where A: Amplitude of sound wave after propagation

A: Amplitude of sound wave before propagation

0

γ: Specific heat ratio (= 1.403)

R: Inner diameter of the tube

c: Sound velocity (= 344 [m / s] (20 ° C air value))

f: Frequency (= 10Hz (Natural frequency of human body))

H: Viscosity coefficient (= 0.0000182 [Pa's] (20 ° C air value))

P: Density (= 1.205 [kg / m ³ ] (20 ° C air value))

L: Length of pressure propagation tube

And

[0054] According to the formula (1), the tube length L is set to 250 mm, 500 mm, 750 mm, 1000 mm.

Fig. 6 shows the amplitude ratio A / A of the sound wave when the inner diameter R of the tube is changed.

0

[0055] As shown in FIG. 6, regardless of the tube length L, the larger the inner diameter R of the tube, the larger the amplitude ratio A / A, that is, the propagation loss becomes smaller. Especially for tubes

0

When the inner diameter R is less than 0.5 mm, the propagation loss is large! /.

Next, the change in the amplitude of the sound wave accompanying the change in the volume of the tube will be examined. When the pressure propagation tube (22) is connected to the pressure sensitive tube (21), the volume of the entire tube is increased by the pressure propagation tube (22). As a result, when the air in the pressure-sensitive tube (21) is displaced by a certain amount due to deformation of the pressure-sensitive tube (21), the larger the volume of the connected pressure propagation tube (22), the larger the amount. Against the air displacement Therefore, the amplitude of the sound wave transmitted through the pressure propagation tube (22) is reduced. That is, the amplitude of the sound wave is calculated by the following formula.

[0057] [Equation 2]

_{_{Α = Α 0 · V 0 I}} {v 0 + * RI 2f ^ L) (2) where, A: amplitude of the sound wave after propagating

A: Amplitude of sound wave before propagation

0

V: Volume of pressure-sensitive tube

0

R: Inner diameter of the tube

L: Length of pressure propagation tube

And

[0058] FIGS. 7 and 8 show the amplitude ratio A / A of the sound wave calculated by the equation (2). Figure 7 is feeling

0

Pressure tube volume V force 12560mm ³ (for example, inner diameter 4mm, length 1000mm)

0

Fig. 8 shows the volume of pressure-sensitive tube V force ¾5120mm ³ (for example, inner diameter 4mm, length 2000mm)

0

Results are shown.

[0059] As shown in FIGS. 7 and 8, regardless of the length L of the pressure propagation tube, the smaller the inner diameter R of the tube, the larger the amplitude ratio A / A, that is, within the pressure-sensitive tube. Pressure fluctuations

0

It can be seen that it propagates efficiently.

[0060] Figures 9 and 10 show the results of multiplying the detection sensitivity due to the propagation loss and the detection sensitivity due to the volume change.

[0061] As shown in Fig. 9, 10 forces, repulsive forces, the inner diameter of the tube R force S ratio 0.5 mm to 2.5 mm, amplitude ratio A

It can be seen that / A is sufficiently large. Furthermore, the maximum value of the amplitude ratio A / A is the inner diameter of the tube.

0 0

Since the R force is between Slmm and 2mm, the inner diameter R of the tube is preferably between lmm and 2mm. In other words, if the inner diameter R of the tube is 0.5mm to 2.5mm, preferably lmm to 2mm, the pressure propagation tube (22) can efficiently reduce the pressure fluctuation in the pressure sensitive tube (21) to the main body (30). Propagating power S Capable power S

[0062] Effects of one embodiment In the embodiment, since the pressure receiving sensor (33) is provided together with the main body (30), the pressure receiving sensor (33) is carefully handled together with the main body (30). Failure can be suppressed. Furthermore, since the pressure receiving sensor (33) is provided in the main body (30) so that the pressure receiving sensor (33) is not exposed to the outside, the pressure receiving sensor (33) also has the ability to sleep. Failures that are not directly impacted can be further suppressed. In addition, when the pressure sensing tube (21) is replaced by providing the pressure sensing sensor (33) together with the main body (30), the pressure sensing sensor (33) is removed together with the pressure sensing tube (21). The force S is used to prevent the pressure receiving sensor (33) from being discarded together with the pressure sensing tube (21).

[0063] Further, the pressure receiving sensor (33) is provided together with the main body (30)!

By providing a pressure propagation tube (22) that connects 21) and the main body (30), the pressure sensitive tube (21) can detect pressure fluctuations caused by body movements of the subject. ) Can be designed mainly for the propagation of pressure fluctuations. As a result, it is possible to realize a body movement measuring device (10) that can detect the body movement of a sleeping person as a pressure fluctuation with high sensitivity and can efficiently propagate the pressure fluctuation to the main body (30). it can

Yes

[0064] Specifically, by setting the pressure-sensitive tube (21) to an outer diameter of 6 mm and an inner diameter of 4 mm, it is possible to detect the sleeper's body movement as a pressure fluctuation with high sensitivity without giving a feeling of foreign body to the sleeper. I can do it.

[0065] In addition, by setting the inner diameter of the pressure propagation tube (22) to lmm to 2mm, the attenuation of the pressure fluctuation accompanying the propagation is suppressed, and the pressure fluctuation can be efficiently propagated to the main body (30). And force S.

[0066] << Other Embodiments >>

According to the above embodiment, the following configuration is possible.

[0067] In the embodiment, the force using a hollow tube having a circular cross section as the pressure-sensitive part is not limited to this, such as a hollow sheet-like member, which can be deformed and sleeps due to internal pressure fluctuations. Anything can be used as long as it can detect a person's body movement.

[0068] Similarly, the pressure propagation tube (22) is a hollow tube having a circular cross section. However, as long as the hollow tube is not limited to this, the tube may have a square cross section or an oval cross section. However, if the cross-sectional area of the internal space of the pressure propagation tube (22) is smaller than the cross-sectional area of the internal space of the pressure-sensitive tube (21), the pressure fluctuation in the pressure-sensitive tube (21) will be larger. This is preferable because it can propagate as fluctuation to the main body (30).

[0069] In the embodiment, the pressure sensor (33) is built in the main body (30). However, the pressure receiving sensor (33) may be externally attached to the main body (30). . However, the pressure sensor (33) as described above is preferable because it can suppress a failure in the direction of force built in the main body (30).

[0070] Further, in the above embodiment, the force that makes the body movement measuring device (10) perform bed leaving determination and sleep determination based on the body movement signal. You may do it. In this case, only the heart rate component and the rough body motion component are separated from the body motion signal, and these components are compared with a predetermined threshold value to determine whether or not necessary data is obtained. Good! /

[0071] The above embodiments are essentially preferable examples, and are not intended to limit the scope of the present invention, its application, or its use.

Industrial applicability

[0072] As described above, the present invention is particularly useful for a body movement measuring apparatus that measures the body movement of a sleeping person from pressure fluctuations of the pressure-sensitive part accompanying the body movement of the sleeping person.

Claims

The scope of the claims

[1] A hollow pressure-sensitive part (21) that is deformed in accordance with the body movement of the subject and the internal pressure fluctuates, and is connected to the pressure-sensitive part (21), and the pressure-sensitive part (21) A hollow pressure propagation part (22) for propagating pressure fluctuations;

A pressure detector (33) for detecting pressure fluctuations is connected to the pressure propagation part (22), and the pressure fluctuations in the pressure sensitive part (21) propagated by the pressure propagation part (22) A body motion measuring device comprising: a device body (30) that detects the body motion of a subject by detection by a detection unit (33).

[2] In claim 1,

The body motion measuring device, wherein each of the pressure sensitive part (21) and the pressure propagation part (22) is a tubular member.

[3] In claim 1,

The body movement measuring device, wherein the pressure propagation part (22) is a tubular member and has an inner diameter force of Slmm or more and 2 mm or less.