JP2013215252A - Biological information measuring apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a biological information measuring apparatus capable of acquiring biological information of each of two subjects when the two subjects sleep on one bed.SOLUTION: A biological information measuring apparatus 1 includes: a body movement detection unit 10 for detecting the movements of respective bodies of a first subject HA and a second subject HB; and a body movement information separation unit 21 for calculating first biological information FA and second biological information FB on the basis of a detection result of the body movement detection unit 10. The body movement detection unit 10 includes a plurality of pressure detection units P having a signal generation unit D, which generates output signals F and a fluid chamber C, and the plurality of pressure detection units P are provided so as to have a part not overlapping with each other in the plan view. The body movement information separation unit 21 calculates the first biological information FA on the basis of at least two output signals F, and also calculates the second biological information FB on the basis of at least two output signals F.

Description

  The present invention relates to a biological information measuring device.

  An apparatus for measuring biological information of a subject during sleep is provided. For example, in Patent Document 1, a mattress enclosing a fluid is laid under the bedding, the movement of the subject's body on the bedding is detected using the pressure fluctuation of the mattress, and the subject's sleep is based on the detection result. A technique for discriminating between a state and an arousal state is disclosed. When using this technology, it is possible to collect biological information without putting a mental and physical burden on the subject compared to the method of measuring the biological information of the subject by wearing a band on the wrist or ankle of the subject. It becomes.

JP 2009-160001 A

Two subjects may go to bed on one bedding. When measuring biological information of each of two subjects on one bedding individually, if each of the two subjects wears a band and measures the biological information, the biological information of each of the two subjects can be accurately obtained. Can be acquired. However, this method has a problem of placing a mental and physical burden on the subject.
On the other hand, when a mattress enclosing a fluid is placed under the bedding shared by two subjects and the movement of the subject's body is measured by the pressure change of the mattress, the body motion, pulse, etc. of the two subjects are Since mixed values are measured, the biological information of each subject cannot be measured accurately.
The present invention has been made in view of the above-described circumstances, and when two subjects go to sleep on one bedding, each of the two subjects does not apply a mental and physical load to the subjects. It is an object of the present invention to provide a biological information measuring device capable of acquiring the biological information.

  In order to solve the above-described problems, the biological information measuring apparatus according to the present invention is a biological information measuring apparatus capable of simultaneously measuring the body movements of the first subject and the second subject lying on one bedding. A body motion detection unit provided in a lower portion of the bedding and detecting a body motion of the first subject and the second subject, and based on a detection result of the body motion detection unit, the first A body motion information separation unit that calculates first biological information representing the body movement of the subject and a second body information representing the body motion of the second subject, and the body motion detection unit includes: A plurality of pressure detection units each including a fluid chamber that encloses a predetermined fluid and a signal generation unit that detects an internal pressure of the fluid chamber and generates an output signal indicating a magnitude according to the detection result; The plurality of pressure detectors overlap each other when viewed in plan. The body motion information separating unit calculates the first biological information based on at least two of the output signals, and also calculates the second biological information based on at least two of the output signals. Biometric information is calculated.

According to the present invention, each of the plurality of pressure detection units provided in the body motion detection unit detects the body movements of the first subject and the second subject. Therefore, the output signal output from each pressure detection unit includes a component representing the body motion of the first subject and a component representing the body motion of the second subject. That is, the magnitude indicated by the output signal output from each pressure detector is the sum of the magnitude indicated by the component representing the body movement of the first subject and the magnitude indicated by the component representing the body movement of the second subject. It becomes the size. Therefore, it is difficult to individually grasp the movement of the body of the first subject or the second subject based on one output signal.
On the other hand, the biological information measuring device according to the present invention is provided such that the plurality of pressure detection units have portions that do not overlap each other when viewed in plan. Therefore, the ratio of the magnitude | size which the component showing the body movement of a 1st test subject shows, and the magnitude | size which the component showing the body movement of a 2nd test subject differs for every output signal. For example, the ratio of the magnitude of the component representing the body movement of the first subject and the magnitude of the component representing the body movement of the second subject included in a certain output signal, and an output different from the certain output signal The ratio of the magnitude of the component representing the body movement of the first subject included in the signal and the magnitude of the magnitude of the component representing the body movement of the second subject are different. Therefore, by using an output signal different from the certain pressure signal, the magnitude of the component representing the movement of one body of the first subject or the second subject among the components of the certain output signal is indicated. Can be small. Thereby, the biological information measuring device according to the present invention can simultaneously measure the body movements of the first subject and the second subject lying on one bedding.
Moreover, since the body movement detection part is provided under the bedding, the biological information measuring device according to the present invention does not place physical and physical burdens on the two subjects. It becomes possible to measure movement.
The body movement includes a subject's pulse, respiration, body movement, and the like. Accordingly, it is possible to acquire various biological information such as the pulse, respiration, and body movement of the subject based on the body movement of the subject.

  The bedding includes a first bedding area for a first subject to lie down and a second bedding area for a second subject to lie down, and the body motion detector includes first to fourth pressures. The fluid chamber provided in the first pressure detection unit is provided in a first region that overlaps the first bedding region when viewed in plan, and the fluid chamber provided in the second pressure detection unit includes: A part of the fluid chamber provided in the second region that overlaps with the second bedding region when viewed in plan and provided in the third pressure detection unit is provided in the second region, and the fourth pressure detection unit A part of the fluid chamber provided in the first region, the body motion information separation unit is a first output signal that is an output signal from a signal generation unit provided in the first pressure detection unit, and Based on a third output signal that is an output signal from a signal generator provided in the third pressure detector. The first biological information is calculated, and the second output signal which is an output signal from the signal generation unit provided in the second pressure detection unit, and the signal generation unit provided in the fourth pressure detection unit The second biological information is preferably calculated based on a fourth output signal that is an output signal.

According to this aspect, the first pressure detection unit and the third pressure detection unit are used to calculate the first biological information representing the movement of the body of the first subject, and the second pressure detection unit Second biological information representing the movement of the body of the second subject is calculated using the fourth pressure detection unit.
The first pressure detection unit is provided in the first region. Therefore, the magnitude | size which the component showing the body movement of the 1st test subject shows among the components which the 1st output signal which the 1st pressure detection part outputs has is the component showing the body movement of the 2nd test subject. Larger than shown. On the other hand, a part of the third pressure detection unit is provided in the second region. Therefore, the proportion of the magnitude indicated by the component representing the body movement of the second subject relative to the magnitude indicated by the third output signal output by the third pressure detector is the magnitude indicated by the first output signal. On the other hand, the size of the component representing the movement of the body of the second subject is larger than the ratio. Therefore, by using the third output signal, it is possible to reduce the size of the component representing the body movement of the second subject in the first output signal (or remove the component). For example, by subtracting the third output signal (or the signal obtained by amplifying the third output signal) from the first output signal (or the signal obtained by amplifying the first output signal), The magnitude | size which the component showing the motion of a 2nd test subject shows can be made small (or the said component is removed). Thus, the biological information measuring device according to the present invention can individually measure the movement of the body of the first subject.
Similarly, the biological information measuring apparatus according to the present invention uses the fourth output signal to reduce the size indicated by the component representing the body movement of the first subject among the components of the second output signal. Thus, it is possible to individually measure the movement of the body of the second subject.

  When the region between the first region and the second region of the body motion detection unit is a third region, the fluid chamber included in the third pressure detection unit includes the first region and the second region. A fluid chamber extending in the region and the third region, and provided in the fourth pressure detector, extends in the first region, the second region, and the third region, The region in which the fluid chamber provided in the third pressure detection unit is provided is a first small region, the region in which the fluid chamber provided in the fourth pressure detection unit is provided as a second small region, Of these, when the region in which the fluid chamber provided in the third pressure detection unit is provided is the third small region, and the region in which the fluid chamber provided in the fourth pressure detection unit is provided as the fourth small region, The area of the three small regions is larger than the area of the first small region, and the area of the second small region is Larger than the area of the fourth sub-region, it is preferable.

According to this aspect, the fluid chamber included in the third pressure detection unit is provided such that the area of the third small region is larger than the area of the first small region. Among these, the magnitude | size which the component showing the body movement of a 2nd test subject shows becomes larger than the magnitude | size which the component showing the body motion of a 1st test subject shows.
Therefore, the first biological information can be obtained by reducing (or removing) the magnitude of the component indicating the body movement of the second subject included in the first output signal by using the third output signal. By calculating, the first biological information can accurately represent the movement of the body of the first subject.
Similarly, using the fourth output signal that includes many components representing the body movement of the first subject, the size of the component representing the body movement of the first subject included in the second output signal is reduced. By calculating the second biological information by (or removing the component), the second biological information can accurately represent the movement of the body of the second subject.

  In the biological information measuring device described above, the area of the first area in which the fluid chamber provided in the first pressure detection unit is provided is the area of the first small area and the area of the second small area. The area of the second region in which the fluid chamber provided in the second pressure detection unit is provided is greater than the sum of the area of the third small region and the area of the fourth small region. It may be characterized by being large.

Further, in the above-described biological information measuring device, the body movement information separation unit calculates the first biological information by subtracting the third output signal from the first output signal, and calculates the first biological information from the second output signal. The second biological information may be calculated by subtracting the fourth output signal.
According to this aspect, since the first biological information accurately represents the movement of the body of the first subject, and the second biological information can accurately represent the movement of the body of the second subject, one bedding The body movement of each of the first subject and the second subject lying on the top can be measured simultaneously.

The biological information measuring apparatus 1 described above is based on the first biological information, the first pulse signal representing the pulse of the first subject, the first respiratory signal representing the breath of the first subject, and Calculating at least one of the first body motion signals representing the body motion of the first subject, and based on the second biological information, a second pulse signal representing the pulse of the second subject, the second It is preferable to include a signal extraction unit that calculates at least one of a second respiratory signal representing the breathing of the subject and a second body motion signal representing the body motion of the second subject.
According to this invention, it becomes possible to simultaneously acquire the pulse, respiration, and body motion of each of the first subject and the second subject.

It is a perspective view of the biological information measuring device concerning the embodiment of the present invention. It is a top view of a body movement detection part with which the biological information measuring device is provided, and bedding. It is a block diagram which shows the structure of the biometric information measuring device. It is a top view of the body movement detection part with which the biological information measuring device is provided. It is a fragmentary sectional view of a body movement detection part and bedding with which the living body information measuring device is provided. It is a top view of the body movement detection part with which the biological information measuring device concerning contrast 1 is provided. It is a top view of the body movement detection part with which the biological information measuring device concerning contrast 2 is provided. It is a graph showing the function A (t) used by simulation. It is a graph showing function B (t) used by simulation. It is a graph showing function FA (t) calculated by simulation. It is a graph showing function FB (t) calculated by simulation. It is a top view of a body movement detection part with which a living body information measuring device concerning modification 5 is provided.

<Embodiment>
Hereinafter, various embodiments according to the present invention will be described with reference to the accompanying drawings.

FIG. 1 is a perspective view of a biological information measuring apparatus 1 according to an embodiment of the present invention. The biological information measuring device 1 is a device that measures the biological information of each of two subjects lying on the bedding M (first subject HA and second subject HB).
As shown in FIG. 1, the biological information measuring apparatus 1 is arranged on the lower side of the bedding M and detects a body motion of two subjects, based on the detection result of the body motion detection unit 10. The control box 30 for calculating the biological information of each of the first two subjects and the wiring 200 for transmitting various signals output from the body motion detection unit 10 to the control box 30 are provided.

FIG. 2 is a plan view of the bedding M and the body motion detection unit 10 when viewed from the upper side of the bedding M (that is, a direction perpendicular to the surface on which the subject lies on the surface of the bedding M). In the following description, viewing the body motion detection unit 10 or the bedding M from the upper side of the bedding M may be simply expressed as “view in plan”.
As shown in FIG. 2, the bedding M includes a first bedding area ARm1 for the first subject HA to lie down and a second bedding area ARm2 for the second subject HB to lie down. That is, when a straight line that bisects the bedding M left and right in plan view is the center line Mid, the first bedding area ARm1 and the second bedding area ARm2 are located on opposite sides of the center line Mid.
The body motion detection unit 10 includes a first area AR1 that overlaps the first bedding area ARm1 when viewed in plan, a second area AR2 that overlaps the second bedding area ARm2 when viewed in plan, and a first area AR1 and a second area. It is divided into a third area AR3 between the area AR2.

FIG. 3 is a block diagram showing a configuration of the biological information measuring apparatus 1.
As shown in FIG. 3, the body motion detector 10 includes a pressure detector P1 (first pressure detector) having a fluid chamber C1 and a signal generator D1, and a pressure having a fluid chamber C2 and a signal generator D2. Detection unit P2 (second pressure detection unit), pressure detection unit P3 (third pressure detection unit) having fluid chamber C3 and signal generation unit D3, and pressure having fluid chamber C4 and signal generation unit D4 A detection unit P4 (fourth pressure detection unit) is provided.
Hereinafter, the pressure detection units P1 to P4 may be collectively referred to as the pressure detection unit P, the fluid chambers C1 to C4 may be collectively referred to as the fluid chamber C, and the signal generation units D1 to D4 may be collectively referred to as the signal generation unit D.

The fluid chamber C is a mattress having an internal space in which an incompressible fluid such as water or air is enclosed, and is formed into a bag shape from an elastic material.
The signal generator D detects a change in pressure in the internal space of the fluid chamber C using a sensor (for example, a condenser microphone), and outputs an output signal F indicating a magnitude according to the detection result. More specifically, the signal generation unit D1 outputs an output signal F1 (first output signal) indicating the magnitude of the pressure change inside the fluid chamber C1, and the signal generation unit D2 is inside the fluid chamber C2. An output signal F2 (second output signal) indicating the magnitude of the pressure change is output, and the signal generator D3 outputs an output signal F3 (third output signal) indicating the magnitude of the pressure change inside the fluid chamber C3. Then, the signal generation unit D4 outputs an output signal F4 (fourth output signal) indicating the magnitude of the pressure change inside the fluid chamber C4.
In the present embodiment, the signal generation unit D detects a change in the pressure inside the fluid chamber C, but may detect a pressure inside the fluid chamber C.
In this embodiment, the output signal F is an analog signal, but may be a digital signal. In this case, the signal generation unit D (each of the signal generation units D1 to D4) only needs to include an AD conversion circuit.

On the other hand, as shown in FIG. 3, the control box 30 includes an arithmetic processing unit 20 that calculates biometric information of each of two subjects based on output signals F1 to F4 output from the body motion detection unit 10, a power-on An operation unit 31 for performing a / off operation, a measurement start / end operation, and the like, and a display unit 32 for displaying a measurement result of biometric information and various guidances. Moreover, although illustration is abbreviate | omitted, the control box 30 is a power supply which supplies electric power to the biological information measuring device 1, and a storage unit for storing an output result from the body motion detection unit 10 and a calculation result of the arithmetic processing unit 20 .
The arithmetic processing unit 20 includes a body motion information separation unit 21 and a signal extraction unit 22. The arithmetic processing unit 20 is a functional block realized by a CPU (central processing unit) of the control box 30 (not shown) executing a computer program and functioning according to the computer program.

The body motion information separation unit 21 includes an AD conversion circuit, and based on the analog output signals F1 to F4, the digital first biological information FA representing the body movement of the first subject HA, and the second subject Digital second biological information FB representing the body movement of the HB is calculated.
Here, “subject's body movement” includes not only body movement such as a change in the posture of the subject but also breathing and pulse of the subject. A specific calculation method for the first biological information FA and the second biological information FB will be described later.

  The signal extraction unit 22 includes a filter that passes a predetermined band. The signal extraction unit 22 obtains a first pulse signal representing the pulse of the first subject HA, a first respiratory signal representing the breathing of the first subject HA, and the body of the first subject HA from the first biological information FA. A first body motion signal representing motion is extracted. Further, the signal extraction unit 22 obtains a second pulse signal representing the pulse of the second subject HB, a second breath signal representing the breath of the second subject HB, and the second subject HB from the second biological information FB. A second body motion signal representing the body motion is extracted. Note that the first pulse signal, the first respiratory signal, and the first body motion signal may be collectively referred to as a biological signal IA. In addition, the second pulse signal, the second respiratory signal, and the second body motion signal may be collectively referred to as a biological signal IB.

FIG. 4 is a plan view of the body motion detection unit 10.
As shown in FIG. 4, the fluid chambers C <b> 1 to C <b> 4 are provided so as not to overlap each other when seen in a plan view. Specifically, the fluid chamber C1 is provided in the first region AR1, the fluid chamber C2 is provided in the second region AR2, and the fluid chamber C3 is provided in the first region AR1, the second region AR2, and the third region AR2. The region AR3 is provided in a region other than the region where the fluid chamber C1 or the fluid chamber C2 is provided, and the fluid chamber C4 is the fluid chamber C1 among the first region AR1, the second region AR2, and the third region AR3. The fluid chamber C2 is provided in a region other than the region in which the fluid chamber C3 is provided.
In the present embodiment, when viewed in plan, the area of the region in which the fluid chamber C1 is provided is equal to the area of the region in which the fluid chamber C2 is provided, and the area of the region in which the fluid chamber C3 is provided and the fluid chamber The area of C4 is equal to the area.
Hereinafter, in the first region AR1, the region in which the fluid chamber C3 is provided is referred to as a small region ARp1 (first small region), and the region in which the fluid chamber C4 is provided is referred to as a small region ARp2 (second small region). In the second region AR2, the region in which the fluid chamber C3 is provided is referred to as a small region ARp3 (third small region), and the region in which the fluid chamber C4 is provided is referred to as a small region ARp4 (fourth small region).

The vibration caused by the movement of the subject's body propagates to the body motion detection unit 10 via the bedding M, and changes the pressure inside the fluid chamber C.
FIG. 5 is a partial cross-sectional view of the bedding M and the body movement detection unit 10 taken along the line ZZ ′ in FIG. As shown in FIG. 5, the pressure inside the fluid chamber C1 changes mainly based on the vibration VA caused by the body movement of the first subject HA lying on the first bedding area ARm1 directly above the fluid chamber C1. .
However, since the first subject HA and the second subject HB are lying on one bedding M, the vibration caused by the movement of the body of the second subject HB propagates to the fluid chamber C1 via the bedding M. To do. Therefore, the pressure inside the fluid chamber C1 varies not only with the vibration VA but also with the vibration VB generated by the movement of the body of the second subject HB. For example, when the bedding M has high rigidity, the movement of the body of the second subject HB has a great influence on the pressure inside the fluid chamber C1, and the distance between the second subject HB and the fluid chamber C1 is large. In a short case, the influence of the body movement of the second subject HB on the pressure inside the fluid chamber C1 is also great.
Similarly, the pressure inside the fluid chambers C2 to C4 changes based on the body movements of both the first subject HA and the second subject HB. That is, the magnitudes of the output signals F1 to F4 change based on the body movements of both of the two subjects. Therefore, the body movement of one of the two subjects cannot be detected from one output signal F among the output signals F1 to F4.
Therefore, in the present embodiment, the body movements (first biological information FA and second biological information FB) of each of the two subjects are calculated using the plurality of output signals F.
Hereinafter, a method for calculating the first biological information FA representing the body movement of the first subject HA and the second biological information FB representing the body movement of the second subject HB from the output signals F1 to F4. Detailed description.

Let A (t) be a function representing the magnitude of the output signal F1 at time t when only the first subject HA is lying on the bedding M (in the first bedding area ARm1). Further, let B (t) be a function that represents the magnitude of the output signal F2 at time t when only the second subject HB is lying on the bedding M (in the second bedding area ARm2).
At this time, when the first subject HA and the second subject HB are lying on the bedding M, the function F1 (t) representing the magnitude of the output signal F1 at the time t is the function A (t) and The function F (t) is expressed by the following formula (1), and the function F2 (t) representing the magnitude of the output signal F2 at time t is expressed by the following formula (2).
F1 (t) = A (t) + k1 × B (t) (1)
F2 (t) = B (t) + k2 × A (t) (2)
That is, the output signal F1 has a component “A (t)” representing the body movement of the first subject HA and a component “k1 × B (t)” representing the body movement of the second subject HB. . Similarly, the output signal F2 includes a component “k2 × A (t)” representing the body movement of the first subject HA and a component “B (t)” representing the body movement of the second subject HB. Have.
The coefficient k1 appearing in the equation (1) is a real number satisfying 0 <k1 <1, and the coefficient k2 appearing in the equation (2) is a real number satisfying 0 <k2 <1.

Further, when the first subject HA and the second subject HB are lying on the bedding M, a function F3 (t) representing the magnitude of the output signal F3 at time t is expressed by the following equation (3). A function F4 (t) that is expressed and represents the magnitude of the output signal F4 at time t is expressed by the following equation (4).
F3 (t) = k3 × A (t) + k4 × B (t) (3)
F4 (t) = k5 × A (t) + k6 × B (t) (4)
That is, the output signal F3 includes a component “k3 × A (t)” representing the body movement of the first subject HA and a component “k4 × B (t)” representing the body movement of the second subject HB. Have Similarly, the output signal F4 includes a component “k5 × A (t)” representing the body movement of the first subject HA and a component “k6 × B (t) representing the body movement of the second subject HB. Is included.
Here, the coefficient k3 is a real number that satisfies 0 <k3 <1, the coefficient k4 is a real number that satisfies 0 <k4 <1, the coefficient k5 is a real number that satisfies 0 <k5 <1, and the coefficient k6 is 0 < It is a real number that satisfies k6 <1. Specifically, when the area of the region in which the fluid chamber C3 is provided in plan view is S3, the area of the small region ARp1 is Sp1, and the area of the small region ARp2 is Sp2, the coefficient k3 is an area with respect to the area S3. The value is determined based on the ratio of Sp1, and the coefficient k4 is a value determined based on the ratio of the area Sp3 to the area S3. Further, when the area of the fluid chamber C4 when viewed in plan is S4, the area of the small area ARp3 is Sp3, and the area of the small area ARp4 is Sp4, the coefficient k5 is the ratio of the area Sp2 to the area S4. The coefficient k6 is a value determined based on the ratio of the area Sp4 to the area S4. That is, the relationship shown in the following equation (5) is established between the coefficient k3 and the coefficient k4, and the relationship shown in the following equation (6) is established between the coefficient k5 and the coefficient k6.
k3: k4 = Sp1: Sp3 (5)
k5: k6 = Sp2: Sp4 (6)
In the present embodiment, the area Sp1 and the area Sp4 are equal, and the area Sp2 and the area Sp3 are equal. In the present embodiment, the sum of the area Sp1 and the area Sp2 is smaller than the area of the fluid chamber C1 when viewed in plan, and the sum of the area Sp3 and the area Sp4 of the fluid chamber C2 when viewed in plan. Smaller than the area.

The body motion information separator 21 generates the first biological information FA based on the output signal F1 and the output signal F3. Specifically, when the function representing the value of the first biological information FA at time t is FA (t), the function FA (t) satisfies the following expression (7).
FA (t) = F1 (t) -F3 (t)
= {1-k3} * A (t) + {k1-k4} * B (t)
= A (t) + {− k3} × A (t)
+ {K1-k4} × B (t) (7)
The first biological information FA includes a component “{1-k3} × A (t)” representing the body movement of the first subject HA and a component “{k1− representing the body movement of the second subject HB. k4} × B (t) ”.
Here, the coefficient k3 and the coefficient k4 are such that the size of the term “{k1−k4} × B (t)” of the function B (t) in the function FA (t) shown in Expression (7) is small. As appropriate. That is, the fluid chamber C3 (the small area ARp1 and the small area ARp3) is provided such that the proportion of the component representing the body movement of the second subject HB in the first biological information FA is small.

In Equation (7), when the coefficient k4 (area Sp3) is determined so that “k1−k4” becomes “0”, the size of the term of the function B (t) in the function FA (t) is “ 0 ".
However, since the fluid chamber C1 and the second bedding area ARm2 do not overlap when viewed in plan, the fluid chamber C3 and the second bedding area ARm2 overlap, so that the second subject in the pressure change of the fluid chamber C1 The coefficient k1, which is a value indicating the ratio of the contribution of the body movement of HB, is smaller than the coefficient k4, which is a value indicating the ratio of the contribution of the body movement of the second subject HB in the pressure change in the fluid chamber C3. Become. Therefore, “k1-k4” cannot be set to 0.
Therefore, in the present embodiment, by determining the area Sp1 and the area Sp3 so that the coefficient k3 and the coefficient k4 satisfy the condition shown in the following equation (8), the function B (t) in the function FA (t) Reduce the size of the term.
{−k3}> {k1−k4} (8)
Expression (8) is transformed into the following expression (9).
k4> k1 + k3 (9)
That is, in the present embodiment, the area Sp1 of the small region ARp1 and the area Sp3 of the small region ARp3 are determined so that the condition shown in Expression (9) is satisfied. More specifically, as shown in FIG. 4, the fluid chamber C3 is arranged so that the area Sp3 is larger than the area Sp1. As a result, the size of the term of the function B (t) in the function FA (t) can be reduced, and the body movement of the first subject HA represented by the function A (t) can be extracted. .

Similarly, the body motion information separator 21 generates the second biological information FB based on the output signal F2 and the output signal F4. Specifically, when the function representing the value of the second biological information FB at time t is FB (t), the function FB (t) satisfies the following expression (10).
FB (t) = F2 (t) -F4 (t)
= {1-k6} * B (t) + {k2-k5} * A (t)
= B (t) + {− k6} × B (t)
+ {K2−k5} × A (t) (10)
The second biological information FB includes a component “{k2−k5} × A (t)” representing the body movement of the first subject HA and a component “{1- k6} × B (t) ”.
Here, the coefficient k5 and the coefficient k6 are appropriately determined so that the size of the term “{k2−k5} × A (t)” of the function A (t) in Expression (10) becomes small. That is, the fluid chamber C4 (the small area ARp2 and the small area ARp4) is provided so that the proportion of the component representing the body movement of the first subject HA in the second biological information FB is small.

In the present embodiment, by defining the area Sp2 and the area Sp4 so that the coefficient k5 and the coefficient k6 satisfy the condition shown in the following expression (11), the term of the function A (t) in the function FB (t) Reduce the size.
{−k6}> {k2−k5} (11)
Expression (11) is transformed into the following expression (12).
k5> k2 + k6 (12)
That is, in the present embodiment, the area Sp2 of the small region ARp2 and the area Sp4 of the small region ARp4 are determined so that the condition of Expression (12) is satisfied. More specifically, as shown in FIG. 4, the fluid chamber C4 is arranged so that the area Sp2 is larger than the area Sp4. Thereby, the size of the term of the function A (t) in the function FB (t) can be reduced, and the movement of the body of the second subject HB indicated by the function B (t) can be extracted.

  As described above, in the biological information measuring apparatus 1 according to the present embodiment, the fluid chamber C3 (the small area ARp1 and the small area ARp3) represents the body movement of the second subject HB in the first biological information FA. The proportion of the component is provided so that the fluid chamber C4 (the small region ARp2 and the small region ARp4) has a small proportion of the component representing the body movement of the first subject HA in the second biological information FB. It is provided as follows. That is, the first biological information FA can be regarded as representing the body movement of the first subject HA, and the second biological information FB is regarded as representing the body movement of the second subject HB. Can be tricked. Thereby, the biological information measuring device 1 according to the present embodiment can simultaneously measure the body movements of the first subject HA and the second subject HB lying on the same bedding M.

Here, a case where the first biological information FA and the second biological information FB are generated by a biological information measuring device (hereinafter referred to as a biological information measuring device according to the comparison 1) including the body movement detection unit 10a illustrated in FIG. To consider. The body motion detection unit 10a does not include the pressure detection unit P3 and the pressure detection unit P4, but includes only the pressure detection unit P1 and the pressure detection unit P2.
The body motion information separation unit included in the biological information measuring apparatus according to the comparative example 1 first calculates a coefficient k1 that is a value indicating a ratio of the body movement of the second subject HB to the pressure change in the fluid chamber C1. calculate. The body motion information separating unit included in the biological information measuring apparatus according to the comparative 1 outputs an output from the pressure detection unit P1 that is a value obtained by integrating the coefficient k1 with the value indicated by the output signal F2 output from the pressure detection unit P2. The first biological information FA is generated by subtracting from the value indicated by the signal F1. In addition, the body motion information separating unit included in the biological information measuring apparatus according to the proportional 1 uses a coefficient k2 that is a value indicating the ratio of the body movement of the first subject HA to the pressure change in the fluid chamber C2. After the calculation, the second biological information FB is generated by subtracting the value obtained by adding the coefficient k2 to the value indicated by the output signal F1 from the value indicated by the output signal F2.
In contrast, according to the present embodiment, the first biological information FA is generated by a simple calculation of subtracting the value indicated by the output signal F3 from the value indicated by the output signal F1, and the value indicated by the output signal F2 is determined. The second biological information FB is generated by a simple calculation of subtracting the value indicated by the output signal F4. That is, the biological information measuring apparatus 1 according to the present embodiment can generate the first biological information FA and the second biological information FB by simple calculation by including the pressure detection unit P3 and the pressure detection unit P4. It becomes possible to reduce the processing load of the body motion information separation unit 21.

  Moreover, the biological information measuring device 1 according to the present embodiment includes four pressure detection units P1 to P4 as shown in FIG. Then, by providing the fluid chamber C3 of the pressure detection unit P3 so that the area Sp3 of the small region ARp3 is larger than the area Sp1 of the small region ARp1, the size of the term of the function B (t) in the function FA (t) is increased. The thickness can be reduced. Further, by providing the fluid chamber C4 of the pressure detection unit P4 so that the area Sp2 of the small region ARp2 is larger than the area Sp4 of the small region ARp4, the size of the term of the function A (t) in the function FB (t) is increased. The thickness can be reduced.

Here, a case where the first biological information FAb and the second biological information FBb are generated by a biological information measuring device (hereinafter referred to as a biological information measuring device according to the comparison 2) provided with the body movement detecting unit 10b shown in FIG. To consider.
The body motion detection unit 10b illustrated in FIG. 7 is configured similarly to the body motion detection unit 10 illustrated in FIG. 4 except that a pressure detection unit P5 is provided instead of the pressure detection unit P3 and the pressure detection unit P4. The pressure detection unit P5 includes a fluid chamber C5 and a signal generation unit D5 that detects a pressure change inside the fluid chamber C5. In the fluid chamber C5, a region overlapping the first region AR1 in plan view is referred to as a small region ARp5, and a region overlapping the second region AR2 in plan view is referred to as a small region ARp6. The pressure detector P5 outputs an output signal F5. A function F5 (t) representing the magnitude of the output signal F5 at time t is represented by the following equation (13). Note that the coefficient k7 and the coefficient k8 appearing in the following equation (13) are real numbers larger than “0”.
F5 (t) = k7 × A (t) + k8 × B (t) (13)
In addition, the body motion information separation unit included in the biological information measuring apparatus according to the proportional 2 generates the first biological information FAb based on the output signal F1 and the output signal F5, and the first based on the output signal F2 and the output signal F5. 2 Generate biometric information FBb. A function FAb (t) representing the value of the first biological information FAb at time t is represented by the following equation (14), and a function FBb (t) representing the value of the second biological information FBb at time t is It is represented by Formula (15).
FAb (t) = F1 (t) -F5 (t)
= {1-k7} * A (t)
+ {K1-k8} * B (t) (14)
FBb (t) = F2 (t) -F5 (t)
= {1-k8} * B (t)
+ {K2−k7} × A (t) (15)

In order to reduce the size of the term of the function B (t) in the function FAb (t), the following formula (16) needs to be satisfied. Further, in order to reduce the size of the term of the function A (t) in the function FBb (t), it is necessary to satisfy the following expression (17).
k8> k7 (16)
k7> k8 (17)
However, since the equations (16) and (17) cannot be satisfied at the same time, the coefficient k7 and the coefficient k8 are determined to satisfy the following equation (18). That is, in the body motion detection unit 10b, the fluid chamber C5 is provided so that the small area ARp5 and the small area ARp6 have the same area.
k7 = k8 (18)

  FIG. 8 to FIG. 11 are graphs showing assumptions and results of a simulation performed to compare the biological information measuring apparatus 1 according to the embodiment and the biological information measuring apparatus according to the comparative example 2. In the simulation, the function FA (t) representing the value of the first biological information FA generated by the biological information measuring device 1 according to the embodiment when the function A (t) and the function B (t) are given as preconditions. ) And the function FAb (t) representing the value of the first biometric information FAb generated by the biometric information measuring apparatus according to the comparative example 2 are compared with each other in the shape close to the function A (t).

FIG. 8 is a graph showing the function A (t), which is a precondition for this simulation. The vertical axis represents the size of the function A (t), and the horizontal axis represents time t. As described above, the function A (t) is a function representing the magnitude of the output signal F1 when only the first subject HA is lying on the bedding M.
This simulation assumes that the subject's body movement is only pulse and respiration. That is, the function A (t) is a waveform indicating a pressure change in the fluid chamber C1 due to the breathing of the first subject HA, and a waveform indicating a pressure change in the fluid chamber C1 due to the pulse of the first subject HA. Represents a superimposed waveform.
Further, in the figure, “O” marks are given to the upper peak and the lower peak of the waveform represented by the function A (t). Since the waveform representing respiration has a larger amplitude than the waveform representing pulse, the portion marked with “◯” can be regarded as the peak of the waveform representing respiration of the first subject HA. That is, the waveform representing the respiration of the first subject HA has four upper peaks and four lower peaks, and the first subject HA in the period from time t = 0 to time t = 15. Represents four breaths.
FIG. 9 is a graph representing the function B (t), where the vertical axis represents the size of the function B (t) and the horizontal axis represents time t. The function B (t) is a function representing the magnitude of the output signal F2 when only the second subject HB is lying on the bedding M. As shown in this figure, the waveform representing the respiration of the second subject HB has three upper peaks and two lower peaks.

FIG. 10 is a graph showing a waveform representing a change over time of a value indicated by the first biological information FA calculated by the biological information measuring apparatus 1 according to the present embodiment, that is, a function FA (t). In this simulation, the coefficient k1 is set to “0.1”, the coefficient k3 is set to “0.2”, and the coefficient k4 is set to “0.6” in calculating the function FA (t).
As shown in FIG. 10, the waveform represented by the function FA (t) has four upper peaks and four lower peaks. That is, the number of peaks in the waveform shown in FIG. 10 matches the number of peaks in the waveform shown in FIG. Therefore, the function FA (t) can detect the number of breaths performed by the first subject HA during the period from time t = 0 to time t = 15.
FIG. 11 is a graph showing a waveform representing a change in value of the size of the first biological information FAb calculated by the biological information measuring apparatus according to the comparative example 2, that is, a function FAb (t). In this simulation, the coefficient k1 is set to “0.1”, the coefficient k7 is set to “0.6”, and the coefficient k8 is set to “0.6” in calculating the function FAb (t).
As shown in FIG. 11, the waveform represented by the function FAb (t) has two upper peaks and three lower peaks. That is, the number of peaks in the waveform shown in FIG. 11 does not match the number of peaks in the waveform shown in FIG. Therefore, from the function FAb (t), the number of breaths performed by the first subject HA during the period from time t = 0 to time t = 15 cannot be detected.

  Thus, in the biological information measuring apparatus according to the proportional 2, since the body motion detection unit 10 b includes only the three pressure detection units P 1, P 2, and P 5, the movement of the body of the first subject HA and the second Whereas the body movement of the subject HB cannot be accurately separated, the biological information measuring apparatus 1 according to the present embodiment includes the body motion detection unit 10 including the four pressure detection units P1 to P4. Since the fluid chamber C3 and the fluid chamber C4 are provided so as to satisfy the conditions shown in Expression (9) and Expression (12), the movement of the body of the first subject HA and the movement of the body of the second subject HB are determined. Can be separated. That is, the biological information measuring apparatus 1 according to the present embodiment can simultaneously measure the body movements of the first subject HA and the second subject HB lying on the same bedding M.

<Modification>
The present invention is not limited to the above-described embodiments, and various modifications as described below are possible, for example. Moreover, the aspect of the deformation | transformation described below can also combine suitably arbitrarily selected 1 or several.

<Modification 1>
The signal extraction unit 22 according to the above-described embodiment generates a pulse signal, a respiratory signal, and a body motion signal of each of two subjects, but at least one of the pulse signal, the respiratory signal, and the body motion signal. One may be generated.

<Modification 2>
In the embodiment and the modification described above, the body motion detection unit 10 and the control box 30 are formed as separate bodies, but may be formed integrally. In this case, the control box 30 may be disposed under the bedding M together with the body motion detection unit 10.

<Modification 3>
In the embodiment and the modification described above, the control box 30 includes the arithmetic processing unit 20, the operation unit 31, and the display unit 32, but it is sufficient that the control box 30 includes at least the arithmetic processing unit 20.

<Modification 4>
In the embodiment and the modification described above, the arithmetic processing unit 20 includes the body motion information separation unit 21 and the signal extraction unit 22, but may be anything that includes at least the body motion information separation unit 21. In this case, the biological information measuring device 1 outputs the first biological information FA and the second biological information FB.

<Modification 5>
As shown in FIG. 4, the body motion detection unit 10 according to the embodiment and the modification described above is provided with the fluid chamber C3 or the fluid chamber C4 in almost the entire area of the third region AR3. The fluid chamber C3 or the fluid chamber C4 may be provided only in the region of the part.
FIG. 12 is a plan view showing a body motion detection unit 10c according to Modification 5. The body motion detection unit 10c includes a pressure detection unit P3c having a fluid chamber C3c and a pressure detection unit P4c having a fluid chamber C4c instead of the pressure detection unit P3 and the pressure detection unit P4. The configuration is the same as that of the motion detection unit 10. As shown in FIG. 12, the fluid chamber C3c and the fluid chamber C4c are provided in a partial region of the third region AR3. Similar to the body motion detecting unit 10 according to the embodiment, the body motion detecting unit 10c according to the modified example 5 has the area Sp3 of the small region ARp3 larger than the area Sp1 of the small region ARp1, and the area Sp2 of the small region ARp2 is small. Since it is larger than the area Sp4 of the area ARp4, it is possible to simultaneously measure the body movement of each of the first subject HA and the second subject HB.

In any case, in the fluid chamber C3, the small region ARp1 and the small region ARp3 satisfy the condition shown in Expression (9) (that is, the area Sp3 of the small region ARp3 when viewed in plan is the area of the small region ARp1). The fluid chamber C4 may have any shape as long as it is provided so as to be larger than Sp1, and the fluid chamber C4 is set so that the small region ARp2 and the small region ARp4 satisfy the condition shown in Expression (12) (that is, Any shape may be used as long as the area Sp2 of the small area ARp2 when viewed in plan is larger than the area Sp4 of the small area ARp4.
Further, the fluid chambers C1 to C4 may have portions that overlap each other when viewed in plan.

<Modification 6>
In the embodiment and the modification described above, the fluid chamber C3 (fluid chamber C3c) is provided so that the small region ARp1 and the small region ARp3 satisfy the condition shown in Expression (9), and the fluid chamber C4 (fluid chamber C4c). The small region ARp2 and the small region ARp4 are provided so as to satisfy the condition shown in Expression (12), but the present invention is not limited to such a form, and the fluid chamber C3 (fluid chamber C3c) Is provided so that the size of the term “{k1−k4} × B (t)” of the function B (t) in the function FA (t) shown in Expression (7) is small, and the fluid chamber C4 ( The fluid chamber C4c) may be provided so that the size of the term “{k2−k5} × A (t)” of the function A (t) in the function FB (t) shown in Expression (10) is small.
For example, the fluid chamber C3 and the fluid chamber C4 may be arranged so that the coefficient k3 and the coefficient k4 that satisfy the following conditions are obtained.

In the function F1 (t), a value α1 representing the ratio between the magnitude of the coefficient “1” given to the function A (t) and the magnitude of the coefficient “k1” given to the function B (t) is In the function FA (t), the magnitude of the coefficient “1-k3” given to the function A (t) and the coefficient “k1-k4” given to the function B (t) are determined as in the equation (19). A value α2 representing a ratio to the size of is determined as in the following equation (20). At this time, if the value α1 and the value α2 satisfy the condition shown in the following expression (21), the ratio of the size of the term of the function B (t) to the size of the function FA (t) ) In terms of the size of the term of the function B (t).
α1 = k1 (19)
α2 = | k1-k4 | / | 1-k3 | (20)
α1> α2 (21)
Expression (21) is transformed into the following expression (22).
k4 <{2-k3} × k1 (22)
That is, by disposing the fluid chamber C3 so as to satisfy Expression (22), it is possible to generate the first biological information FA that accurately represents the body movement of the first subject HA.

Similarly, in the function F2 (t), a value β1 representing the ratio between the magnitude of the coefficient “1” given to the function B (t) and the magnitude of the coefficient “k2” given to the function A (t) is In the function FB (t), the magnitude of the coefficient “1-k6” given to the function B (t) and the coefficient “k2” given to the function A (t) are defined as the following expression (23). A value β2 representing a ratio to the magnitude of “−k5” is determined as in the following Expression (24). At this time, if the value β1 and the value β2 satisfy the condition shown in the following expression (25), the ratio of the size of the term of the function A (t) to the size of the function FB (t) is expressed as the function F2 (t ) Can be made smaller than the ratio of the size of the term of the function A (t) to the size of.
β1 = k2 (23)
β2 = | k2-k5 | / | 1-k6 | (24)
β1> β2 (25)
Expression (25) is transformed into the following expression (22).
k5 <{2-k6} × k2 (26)
That is, by disposing the fluid chamber C4 so as to satisfy Expression (26), it is possible to generate the second biological information FB that accurately represents the movement of the body of the second subject HB.

  DESCRIPTION OF SYMBOLS 1 ... Living body information measuring device, 10 ... Body motion detection part, 20 ... Operation processing part, 200 ... Wiring, 21 ... Body motion information separation part, 22 ... Signal extraction part, 30 ... Control box, 31 ... Operation part, 32 ... Display unit, AR1 ... first region, AR2 ... second region, AR3 ... third region, ARm1 ... first bedding region, ARm2 ... second bedding region, HA ... first subject, HB ... second subject, ARp1 ˜6 ... small region, C, C1 to C5 ... fluid chamber, D, D1 to D5 ... signal generation unit, P, P1 to P5 ... pressure detection unit, M ... bedding.

Claims (6)

A biological information measuring device capable of simultaneously measuring the body movement of each of a first subject and a second subject lying on one bedding,
A body motion detection unit provided at a lower part of the bedding, and detecting a body motion of the first subject and the second subject;
Based on the detection result of the body motion detection unit, body motion for calculating first biological information representing the body motion of the first subject and second biological information representing the body motion of the second subject An information separator,
With
The body motion detector is
A plurality of pressure detection units each including a fluid chamber that encloses a predetermined fluid and a signal generation unit that detects an internal pressure of the fluid chamber and generates an output signal indicating a magnitude according to the detection result;
The plurality of pressure detectors are
Provided to have portions that do not overlap each other when viewed in plan,
The body motion information separation unit
Calculating the first biological information based on at least two of the output signals, and calculating the second biological information based on at least two of the output signals;
The biological information measuring device characterized by the above-mentioned. The bedding comprises a first bedding region for a first subject to lie down, and a second bedding region for a second subject to lie down,
The body motion detector is
Comprising first to fourth pressure detectors;
The fluid chamber provided in the first pressure detection unit is provided in a first region that overlaps the first bedding region when viewed in plan,
The fluid chamber included in the second pressure detection unit is provided in a second region that overlaps the second bedding region when viewed in plan,
A part of the fluid chamber provided in the third pressure detection unit is provided in the second region,
A part of the fluid chamber provided in the fourth pressure detection unit is provided in the first region,
The body motion information separation unit
Based on a first output signal that is an output signal from a signal generator included in the first pressure detector, and a third output signal that is an output signal from a signal generator included in the third pressure detector. , Calculating the first biological information,
Based on a second output signal that is an output signal from a signal generator included in the second pressure detector, and a fourth output signal that is an output signal from a signal generator included in the fourth pressure detector. Calculating the second biological information;
The living body information measuring device according to claim 1 characterized by things. When the region between the first region and the second region is the third region in the body motion detection unit,
The fluid chamber included in the third pressure detection unit extends to the first region, the second region, and the third region,
The fluid chamber included in the fourth pressure detection unit extends to the first region, the second region, and the third region,
Of the first region, a region in which the fluid chamber provided in the third pressure detection unit is provided is a first small region, a region in which the fluid chamber provided in the fourth pressure detection unit is provided as a second small region,
Of the second region, a region in which the fluid chamber provided in the third pressure detection unit is provided is a third small region, and a region in which the fluid chamber provided in the fourth pressure detection unit is provided is a fourth small region. When
The area of the third small region is larger than the area of the first small region,
An area of the second small region is larger than an area of the fourth small region;
The living body information measuring device according to claim 2 characterized by things. Of the first region, the area of the region in which the fluid chamber provided in the first pressure detection unit is provided is larger than the sum of the area of the first small region and the area of the second small region,
Of the second region, the area of the region in which the fluid chamber provided in the second pressure detection unit is provided is larger than the sum of the area of the third small region and the area of the fourth small region.
The living body information measuring device according to claim 3 characterized by things. The body motion information separation unit
Calculating the first biological information by subtracting the third output signal from the first output signal;
Calculating the second biological information by subtracting the fourth output signal from the second output signal;
The biological information measuring device according to any one of claims 2 to 4, wherein the biological information measuring device is characterized in that: The biological information measuring device includes:
Based on the first biological information, a first pulse signal representing the pulse of the first subject, a first respiratory signal representing the breath of the first subject, and a first motion representing the body movement of the first subject. Calculating at least one of the body motion signals, and based on the second biological information, a second pulse signal representing the pulse of the second subject, a second respiratory signal representing the breath of the second subject, And a signal extraction unit that calculates at least one second body motion signal representing the body motion of the second subject.
The biological information measuring device according to any one of claims 1 to 5, wherein the biological information measuring device is characterized in that:

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