JP4399939B2 - Biological information measuring device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a biological information measuring apparatus that measures biological information such as a subject's respiratory function, blood pressure, electrocardiogram, pulse rate, oxygen saturation, and the like.
[0002]
[Prior art]
In general, it is known that when sleep apnea syndrome in which a relatively long apnea state frequently occurs during sleep, the oxygen concentration in arterial blood is remarkably lowered or heartbeat abnormalities occur simultaneously. Moreover, the apnea state during sleep causes a shallow sleep and may cause a somnolence state in the daytime. Such sleep apnea syndrome is conventionally examined by measuring apnea such as the number of apneas during sleep, electroencephalogram, eye movement, oxygen saturation, etc. using sleep polysomonography. However, in order to perform a large number of tests, it was necessary to hospitalize the subject, which was a burden on the subject both in terms of cost and time. Further, since the examination is performed in a sleep environment different from the daily life of a hospital facility, there are many cases in which normal sleep cannot be obtained, and there is a problem that it is difficult to obtain a reliable sleep result. In view of this, a respiratory function measuring apparatus has been proposed that can easily test an apnea state during sleep without hospitalizing a subject (Japanese Patent Laid-Open No. 5-200031).
[0003]
The conventional respiratory function measurement device includes various biological information detection means for attaching to a subject such as an oxygen saturation detection unit, a respiratory sound detection unit, a body position detection unit, and a plurality of electrodes for heart rate detection. Measurement processing means for storing detection signals from the detection means. Then, the subject takes this respiratory function measuring device home and wears it before going to bed, and uses the detection signals from each detection means during sleep as it is or performs data processing to measure various respiratory functions as measurement results. It is recorded in the means, and a doctor or other expert analyzes the data based on the recorded data at a later date to diagnose sleep apnea syndrome and the like.
[0004]
[Problems to be solved by the invention]
However, in the above conventional respiratory function measuring device, there is a problem that the subject must turn on the power switch after wearing a plurality of detection means by himself / herself, and if the operation for turning on the power switch is forgotten, measurement is not performed. there were.
[0005]
Also, if you do not go to bed immediately after turning on the power switch, or if you forget to turn off the power switch when removing each detection means the next morning, power will be consumed wastefully and used for measurement. When the available memory capacity is reduced or when a battery is used as a power source, there is a problem that the remaining capacity is lowered.
[0006]
An object of the present invention is to solve the above-described problem, and to provide a biological information measuring apparatus capable of determining whether or not a state is to be measured and automatically performing a measurement operation based on the determination result. To do.
[0007]
[Means for Solving the Problems]
According to a first aspect of the present invention, there is provided a living body information measuring apparatus including at least one living body information detecting unit that is attached to a subject and detects information related to the living body of the subject, and a measuring control unit that performs predetermined measurement control. A state determining means for determining whether or not the subject is in a predetermined state and a body position detecting means for detecting the posture of the subject, which is one of the biological information detecting means, wherein the body position detecting means lies on the subject. When it is detected that the state is determined, the state determination unit determines that the state is the predetermined state, and the measurement control unit determines that the state is the predetermined state. Only if The predetermined measurement control is performed.
[0014]
According to this configuration, when the posture detection unit detects that the subject is lying down, the measurement operation is not performed in the state where the subject is standing by determining that the subject is in a predetermined state. Only wasteful power consumption is suppressed.
[0015]
The invention of claim 2 is the biological information measuring device according to claim 1, wherein the predetermined measurement control is a detection operation by the biological information detecting means other than the body position detecting means. Do It is characterized by being.
[0016]
According to a third aspect of the present invention, in the biological information measuring apparatus according to the second aspect, the predetermined measurement control ends the detection operation after a predetermined time has elapsed after starting the detection operation. It is characterized by being.
[0017]
Claims 4 The biological information measuring device according to claim 1, A storage unit for storing measurement data is provided, and the storage unit stores measurement data measured by the predetermined measurement control. It is characterized by that.
[0018]
According to a fifth aspect of the present invention, there is provided a living body information measuring apparatus including at least one living body information detecting unit that is attached to a subject and detects information related to the living body of the subject and a measuring control unit that performs predetermined measurement control. Detecting the posture of the subject as one of selection control means for selecting a start time of the predetermined measurement control, state determination means for determining whether the apparatus is in a predetermined state, and the biological information detection means When the start time point is selected by the selection control unit to perform predetermined measurement control according to the detection result of the body position detection unit, the body position detection unit includes: When detecting that the subject is lying down, the state determination means determines that the predetermined state is present, and the measurement control means determines that the state determination means is in the predetermined state. Is determined that Only if The predetermined measurement control is performed.
[0019]
According to a sixth aspect of the present invention, there is provided a living body information measuring apparatus including at least one living body information detecting unit that is attached to a subject and detects information related to the living body of the subject and a measuring control unit that performs predetermined measurement control. A power input means, a storage unit for storing measurement data, and a body position detection means for detecting the posture of the subject, which is one of the biological information detection means, and power is input by the power input means. Thus, after the measurement control means starts the predetermined measurement control, the body position detection means detects that the subject is lying down. Only if The storage unit stores measurement data measured by the predetermined measurement control.
[0023]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 is a view showing a state in which a respiratory function measuring device, which is an embodiment of a biological information measuring device according to the present invention, is attached to a subject.
[0024]
This respiratory function measuring device 1 is for measuring a respiratory function such as a sleep apnea state of the subject P and notifying a respiratory abnormality, and includes an oxygen saturation detection unit 2, a sound detection unit 3, A detection unit 4, a respiratory effort detection unit 5, a relay unit 6, a body position detection unit 7 (FIG. 4), and a measurement processing unit 8 are provided.
[0025]
The oxygen saturation detection unit 2 and the measurement processing unit 8 are connected by a connection cable 11, and the sound detection unit 3, the respiratory detection unit 4, the respiratory effort detection unit 5 and the relay unit 6 are connected to the connection cables 12, 13 respectively. , 14, and the relay unit 6 and the measurement processing unit 8 are connected by a relay cable 15 in which the connection cables 12, 13, 14 are combined into one.
[0026]
Plugs 11a to 14a are attached to the ends of the connection cables 11 to 14, and can be removed from the jack 8a (FIG. 10) of the measurement processing unit 8 and the jacks 6a, 6b, and 6c (FIG. 10) of the relay unit 6, respectively. It is connected to the. Moreover, the plug 15a is attached to the front-end | tip of the relay cable 15, and is connected to the jack 8b (FIG. 10) of the measurement process part 8 so that removal is possible. Each of the plugs 11a, 12a, 13a, 14a, 15a and the jacks 6a, 6b, 6c, 8a, 8b constitutes a connector and has a function as a connection means that is detachably electrically connected.
[0027]
Next, the configuration of each unit will be described with reference to FIGS. FIG. 2 is a diagram illustrating a configuration of the oxygen saturation detection unit.
[0028]
The oxygen saturation detector 2 detects the oxygen saturation in the artery at the fingertip, and as shown in FIG. 2, one end of the upper and lower clip plates 21 and 22 is pivotally connected and connected to a spring (not shown). The other end portion is urged in the holding direction, and the clip plate 21 or 22 can be attached to the fingertip so that the subject's finger 16 is pinched. The upper clip plate 21 has an LED 23a that emits light having a wavelength whose absorption rate depends on the oxygen concentration in blood (for example, red light), and light having a wavelength whose absorption rate hardly depends on the oxygen concentration in blood (for example, red light). LED 23b that emits external light) and a photodiode that receives light transmitted through the finger 16 out of light emitted from the LEDs 23a and 23b at a position facing the LEDs 23a and 23b of the lower clip plate 22. 24 is provided, and a light reception signal corresponding to the received light intensity is sent to the measurement processing unit 8 via the connection cable 11.
[0029]
Returning to FIG. 1, the sound detection unit 3 is composed of a microphone that is adhered to the throat of the subject P by, for example, an adhesive tape and detects the tracheal sound and snoring sound of the subject P. A signal is sent to the measurement processing unit 8 via the connection cable 12 and the relay cable 15.
[0030]
The respiration detection unit 4 detects airflow generated by the respiration of the subject P, and includes a left nasal breath detection unit 41, a right nasal breath detection unit 42, and a mouth breath detection unit 43, as shown in FIG. 41 and the right nose breath detection unit 42 are bonded to the nose of the subject P by, for example, an adhesive tape so that the mouth detection unit 42 faces the mouth of the nostril and the mouth detection unit 43 faces the mouth (FIG. 1). reference).
[0031]
The left nasal breath detection unit 41, the right nasal breath detection unit 42, and the mouth breath detection unit 43 of the respiration detection unit 4 are each composed of, for example, a thermistor, and as shown in FIG. 3, conductive lines 45, 46, 47, 48 in the housing 44. Are connected in series, and the conductive lines 45 and 48 are combined together as a connection cable 13 in a state of being insulated from each other.
[0032]
When an air flow caused by breathing through the nose or mouth hits one of the left nasal breath detection unit 41, the right nasal breath detection unit 42, and the breath detection unit 43, the temperature of the detection unit rises, and the resistance value between the conductive lines 45 and 48 increases. It appears as a change. Therefore, in the respiration detection unit 4, this change in resistance value is detected as a change in potential difference between the conductive lines 45 and 48.
[0033]
The respiratory effort detection unit 5 is attached to the chest or abdomen of the subject P, and detects a change in the circumference of the chest or abdomen due to the respiratory effort of the subject P. The breathing effort detection unit 5 wraps a non-stretchable belt member around the chest or abdomen of the subject P so that both ends overlap, and the breathing effort detection unit 5 The amount of change in the size of the overlapping portion is detected, and the belt member is made non-stretchable so that the change in the peripheral length appears directly in the amount of change in the size of the overlapping portion.
[0034]
FIG. 4 is a diagram illustrating an internal configuration of a detection box of the respiratory effort detection unit 5. As shown in FIG. 1, the respiratory effort detection unit 5 includes a detection box 51 and belts 52 and 53, and is attached to the chest of the subject P in this embodiment. A moving plate 55, a spring 56, a photo interrupter 57, guide plates 58a and 58b, a body position detecting unit 7 (described later), and the like are arranged.
[0035]
The belts 52 and 53 are not stretchable, so that the change in the circumference of the chest is accurately reflected in the movement of the moving plate 55 in the detection box 51. One end of the belt 52 is fixed to the left end portion 55 b of the moving plate 55. The base end 56 a of the spring 56 is fixed to the predetermined portion 51 b of the detection box 51, and the tip 56 b of the spring 56 is fixed to the right end portion 55 a of the moving plate 55. One end of the belt 53 is fixed to a mounting portion 51 a provided at the right end of the detection box 51.
[0036]
As shown in FIG. 1, the other ends of the belts 52 and 53 are fixed to each other by a surface fastener 59 so that the belts 52 and 53 are detachable and the mounting position is adjustable. Then, by adjusting the mounting position of the hook-and-loop fastener 59 and adjusting the winding length of the subject P, the breathing effort detector 5 can be brought into close contact with the chest of the subject P with an appropriate elastic force of the spring 56. Yes.
[0037]
In FIG. 4, the moving plate 55 is provided with a scale portion 61. As shown in FIG. 5A, the scale portion 61 has lines 63 of a predetermined dimension (for example, 0.03 mm in this embodiment) arranged at equal intervals in the longitudinal direction of the belt (lateral direction in the figure) on a transparent film 62. (In this embodiment, for example, 0.06 mm), a large number of prints are made. As shown in FIG. 5B, the light emitting element (for example, LED) 64 and the light receiving element (for example, photodiode) 65 constituting the photo interrupter 57 are arranged so as to sandwich the scale portion 61.
[0038]
4, guide plates 58a and 58b are fixed to the detection box 51 and regulate the moving direction of the moving plate 55 when the belt 52 is pulled in the arrow Q direction. Although only the guide plate 58b is shown, each is formed in a U-shaped cross section so as to sandwich the moving plate 55.
[0039]
The spring 56 constitutes an elastic means, the belts 52 and 53, the moving plate 55 and the detection box 51 constitute a non-stretchable belt member, the line 63 constitutes an area having a predetermined characteristic, and the photo interrupter 57 reads Parts. The line 63 constitutes a blocking area, and the portion of the film 62 between the lines 63 constitutes a transmission area.
[0040]
As shown in FIG. 1, in this embodiment, the respiratory effort detection unit 5 is mounted on the chest of the subject P, but it may be mounted on the abdomen. Further, instead of the spring 56, elastic means such as rubber may be used.
[0041]
In addition, as shown in FIG. 4, in the present embodiment, the scale portion 61 is provided on the moving plate 55 and the photo interrupter 57 is fixed to the detection box 51. However, the present invention is not limited to this, and the scale portion 61 is attached to the detection box 51. The photo interrupter 57 may be attached to the moving plate 55. That is, it is only necessary to detect the relative movement amount between the right end portion 55a of the moving plate 55 constituting one end of the belt member and the left end portion 51c of the detecting portion box 51 constituting the other end of the belt member.
[0042]
Returning to FIG. 1, the relay unit 6 prevents the wiring from being congested by tangling three connection cables connecting the sound detection unit 3, the respiratory detection unit 4, the respiratory effort detection unit 5, and the measurement processing unit 8. It is fixed to the belt 53 in a box shape. The jacks 6a, 6b to which the plugs 12a, 13a, 14a at the tips of the connection cables 12, 13, 14 to the sound detection unit 3, the respiration detection unit 4, and the respiration effort detection unit 5 are attached to one side surface of the relay unit 6. 6c (FIG. 10) is provided, and a relay cable 15 connected to the measurement processing unit 8 is fixed to the opposite side surface. In the relay unit 6, three connection cables 12, 13, and 14 are provided. The signal lines are grouped together so as to be output by one relay cable 15 in a state of being insulated from each other.
[0043]
The body position detection unit 7 detects the posture of the subject P (standing position, supine position, right-side position, left-side position, prone position, etc.).
[0044]
The body position detection unit 7 includes a rotational position sensor including a conductive movable body sealed in a container provided with a plurality of contacts. The movable body is freely movable and adjacent to the body position detection section 7. A short-circuit state in which two contacts are short-circuited is provided. When the movable body moves due to the change in posture of the subject P, another two contacts are short-circuited. However, this movable body is short-circuited between one short-circuit state and another short-circuit state. Not insensitive. This insensitive state is caused by the presence of a state in which only one contact point is in contact when moving from one short-circuit state to another, but this does not cause the movable body to touch any contact point. Indistinguishable from open state.
[0045]
Therefore, the body position detection unit 7 of the present embodiment includes two rotational position sensors as described above, and has a positional relationship that prevents both rotational position sensors from simultaneously becoming insensitive. It is attached to the subject P.
[0046]
6A and 6B are diagrams showing the configuration of the body position detection unit, in which FIG. 6A is a perspective view of the appearance, FIG. 6B is a cross-sectional view of the rotational position sensor, and FIG. 6C is a cross-sectional view taken along the line CC of FIG. . 7 (a) and 7 (b) are diagrams showing the arrangement state of the body position detection unit when the subject is in the supine position, FIG. 8 is a diagram showing a short-circuit state of the contact with respect to the rotational position of the rotational position sensor, and FIG. It is a circuit diagram which shows the detection circuit of a part.
[0047]
6A, the body position detection unit 7 includes rotational position sensors 71a and 71b having the same structure and a detection circuit 72, which are disposed on a circuit board 73. As shown in FIG. It is accommodated in the detection box 51 of the respiratory effort detection unit 5. As described above, since the body position detecting unit 7 is accommodated in the detection box 51, it is not necessary to separately provide a box for housing the body position detecting unit 7, and thus the work of mounting the respiratory function measuring device 1 can be performed. While simplifying, the discomfort of the test subject P by this wearing can be reduced.
[0048]
As shown in FIGS. 6B and 6C, the rotational position sensors 71a and 71b are arranged in a hollow housing (container) 75 made of an insulating member so that a movable body 76 made of a conductive member can move freely. It is set up. The housing 75 has a rectangular parallelepiped shape in plan view, and spherical recesses 75c and 75d are formed in the center of the top plate 75a and the bottom plate 75b, respectively. Further, contact points 77a, 77b, 77c, 77d made of plate-like conductors are projected toward the central axis 71p at the four corners of the side plate 75e and at substantially the center position in the height direction, and the side plates 75e face each other. Terminals 78a, 78b, 78c, and 78d that project from the contacts 77a, 77b, 77c, and 77d, respectively, project from the outside of the surface.
[0049]
As shown in FIG. 6B, the distance d between the contact points 77a, 77b, 77c, and 77d is set to be slightly shorter than the diameter R of the movable body 76, and faces the movable body 76. The portion is smoothly formed in a circular shape centered on the central axis 71p. Further, as shown in FIGS. 6A and 7, the rotational position sensors 71a and 71b rotate around the central axis 71p (FIG. 6B) by a predetermined angle (in this embodiment, for example, 45 °). As shown in FIG. 4, the circuit board 73 is fixed to the detection box 51 downward in the figure.
[0050]
Here, as shown in FIGS. 6B and 7A, between the contacts 77a and 77d of the rotational position sensor 71a, the contact portion S1, between the contacts 77a and 77b, between the contact portion S2 and between the contacts 77b and 77c. Between the contact portion S3 and the contacts 77c and 77d is referred to as a contact portion S4. Between the contacts 77a and 77d of the rotational position sensor 71b, the contact portion T1, between the contacts 77a and 77b, and between the contacts 77b and 77c, the contact portion T3. The portion between the contacts 77c and 77d is referred to as a contact portion T4.
[0051]
According to this configuration, when the subject P is standing (standing), the movable body 76 is fitted into the recess 75c, so that the movable body 76 has any contact point 77a, 77b, 77c, 77d. No contact is made, and any two contacts are opened (off).
[0052]
On the other hand, as shown in FIG. 7B, when the subject P is in the supine position, the body position detection unit 7 has an upper side (ceiling side) in FIG. Since the movable body 76 of one rotational position sensor 71a is fitted between the contact points 77a and 77d, the two contact points 77a and 77d are disposed on the lower side (floor side). In other words, the contact portion S1 is short-circuited (turned on), and the movable body 76 of the other rotational position sensor 71b is fitted into the circular portion on the tip side of the contact 77a, so that any two contacts are opened. Insensitive state (off).
[0053]
Next, the state of each contact portion of the rotational position sensors 71a and 71b when the posture of the subject is changed will be described with reference to FIG. As described above with reference to FIG. 7, when the subject P is in the supine position, the movable body 76 of the rotational position sensor 71a is fitted between the contacts 77a and 77d, so that the contact portion S1 is short-circuited (ON). To do. When the subject P rotates clockwise in the drawing from the state of FIG. 7, the movable body 76 is once fitted into the circular portion on the tip side of the contact 77a, and the insensitivity that any contact is opened (off). It will be in state A1. When the subject further rotates, the movable body 76 of the rotational position sensor 71a is fitted between the contacts 77a and 77b, and the contact portion S2 is short-circuited (turned on).
[0054]
When the subject further rotates clockwise, the rotational position sensor 71a detects that the movable body 76 is fitted into the tip of the contact 77b, the insensitive state A2, the contact S3 is turned on, and the movable body 76 is fitted into the tip of the contact 77c. Insensitive state A3 → contact part S4 is turned on → movable body 76 is changed to insensitive state A4 fitted into the tip of contact 77d, and contact part S1 is turned on when the subject returns to the supine position.
[0055]
Thus, the range (1) in FIG. 8 corresponds to the supine position, the range (2) corresponds to the left side position, the range (3) corresponds to the prone position, and the range (4) corresponds to the right side position. Correspond. The contact portions S1, S2, S3, and S4 are turned on corresponding to each posture, but no contact portion is turned on until each contact portion is turned on until the next contact portion is turned on. A1, A2, A3 and A4 exist. Therefore, with this rotational position sensor 71a alone, the insensitive states A1, A2, A3, and A4 cannot be distinguished from the open state when the subject P is standing.
[0056]
On the other hand, as shown in FIGS. 6A and 7A, the rotational position sensor 71b rotates counterclockwise by a predetermined angle (for example, 45 ° in this embodiment) with respect to the rotational position sensor 71a. In this state, the circuit board 73 is disposed. Therefore, when the subject P rotates clockwise in FIG. 7, the contact parts T <b> 1 to T <b> 4 are turned on with a delay of 1/8 cycle with respect to the contact parts S <b> 1 to S <b> 4 being turned on, as shown in FIG. 8. Thereby, when the rotational position sensor 71a is in the insensitive state A1, A2, A3, A4, the contact portions T1, T2, T3, T4 of the rotational position sensor 71b are turned on, respectively.
[0057]
In the present embodiment, the rotational position sensor 71b is disposed on the circuit board 73 in a state of being rotated counterclockwise by 45 ° with respect to the rotational position sensor 71a. However, the rotational position sensor 71b is not limited to this. One of the contact portions T1 to T4 of the rotational position sensor 71b is turned on when the 71a is in the insensitive state A1, A2, A3, A4, that is, both the rotational position sensors 71a and 71b are not insensitive at the same time. It should be placed in. For example, the angle may be slightly increased or decreased as compared to 45 °, or may be arranged in a state rotated by an angle such as −45 ° or 135 °.
[0058]
Next, the detection circuit 72 connected to the rotational position sensors 71a and 71b will be described with reference to the circuit diagram of FIG. In FIG. 9, the power supply voltage is V _CC The resistance values of the resistors R1 to R5 are R ₁ ~ R _Five And
[0059]
The terminal 78a of the rotational position sensor 71a is connected to the power supply line U3 through the resistor R1, the terminal 78b is connected to the earth line U4 through a series circuit including the resistors R3 and R4, and the terminal 78c is directly connected to the power supply line U3. The terminal 78d is connected to the connection point of the resistors R3 and R4 via the resistor R2, and the connection point of the resistors R3 and R4 is connected to the output line U1. Thus, a first detection circuit 72a that outputs a voltage of a predetermined level to the output line U1 is configured.
[0060]
On the other hand, the terminals 78a and 78c of the rotational position sensor 71b are directly connected to the power supply line U3, and the terminals 78b and 78d are directly connected to the output line U2 and connected to the earth line U4 via the resistor R5. Has been. Thus, a second detection circuit 72b that outputs a voltage of a predetermined level to the output line U2 is configured.
[0061]
The connection cable 73a extending from the circuit board 73 shown in FIG. 4 is configured by insulating the four conductive lines of the output lines U1, U2, the power supply line U3, and the earth line U4 from each other.
[0062]
With such a circuit configuration of the detection circuit 72, the voltages V1 to V4 output to the output line U1 when the contact portions S1 to S4 of the rotational position sensor 71a are on are respectively
V1 = V _CC ・ R _Four / (R ₁ + R ₂ + R _Four (1)
V2 = V _CC ・ R _Four / (R ₁ + R _Three + R _Four (2)
V3 = V _CC ・ R _Four / (R _Three + R _Four (3)
V4 = V _CC ・ R _Four / (R ₂ + R _Four (4)
Thus, the voltage V5 output to the output line U1 when all the contact portions S1 to S4 are OFF is V5 = 0.
[0063]
On the other hand, the voltage V6 output to the output line U2 when any of the contact portions T1 to T4 of the rotational position sensor 71b is on is V6 = V _CC Thus, the voltage V7 output to the output line U2 when all of the contact portions T1 to T4 of the rotational position sensor 71b are OFF is V7 = 0.
[0064]
For example V _CC = 5 (V), R ₁ = 100 (kΩ), R ₂ = 200 (kΩ), R _Three = 51 (kΩ), R _Four = 100 (kΩ), R _Five When V = 100 (kΩ), V1 = 1.2 (V), V2 = 2.0 (V), V3 = 3.3 (V), V4 = 1.7 (V), and V6 = 5 (V).
[0065]
In this way, by setting the resistance values of the resistors R1 to R4 of the first detection circuit 72a to appropriate values, different levels of voltage are output to the output line U1 when the contact portions S1 to S4 are turned on. Accordingly, it is possible to determine which of the contact portions S1 to S4 of the rotational position sensor 71a is turned on or whether all the contact portions S1 to S4 are turned off. Further, the second detection circuit 72b determines whether any one of the contact portions T1 to T4 of the rotational position sensor 71b is turned on or all the contact portions T1 to T4 are turned off. It becomes possible to do.
[0066]
Therefore, with only one rotational position sensor 71a, it is impossible to determine whether the subject's body is standing or lying down and insensitive when all the contact portions S1 to S4 are off. On the other hand, according to the configuration of the present embodiment, even if all the contact portions S1 to S4 of the rotational position sensor 71a are off, any one of the contact portions T1 to T4 of the rotational position sensor 71b. If the part is turned on, it is determined that the subject's posture is lying and insensitive, and if all the contact parts T1 to T4 are turned off, the subject's position is determined to be standing. can do.
[0067]
This makes it possible to reliably determine whether the subject's body position is the supine position, the left side position, the right side position, the prone position, or the standing position.
[0068]
Further, the detection circuit 72 having the circuit configuration shown in FIG. 9 can be distinguished by the four conductive lines U1 to U4, and the number of signal lines from the body position detection unit 7 to the measurement processing unit 8 is minimized. It can be. Further, the rotational position sensor 71b only needs to be able to determine whether any one of the contact portions is on or all are off, so that the second detection circuit 72b can have a simple circuit configuration.
[0069]
The second detection circuit 72b may have a circuit configuration similar to that of the first detection circuit 72a. Thus, when the rotational position sensor 71a is insensitive in a state where the subject is lying down, the contact portion where the rotational position sensor 71b is turned on can be determined, so that the subject is positioned between which position and which position. Can be determined.
[0070]
Returning to FIG. 1, the measurement processing unit 8 is box-shaped, and a belt 8 c that is passed through a belt loop (not shown) on the back surface is wound around the wrist of the subject P and fixed by a hook-and-loop fastener (not shown). A power switch 81 and a display unit 82 are provided on the surface.
[0071]
Next, the electrical configuration of the measurement processing unit 8 will be described. FIG. 10 is a block diagram showing an electrical configuration of the respiratory function measuring apparatus 1, and FIG. 11 is a block diagram showing functional blocks of the CPU. 1 and 4 are denoted by the same reference numerals.
[0072]
As shown in FIG. 10, the measurement processing unit 8 includes a battery 80, a power switch 81, a display unit 82, signal processing units 83 to 86, an analog switch 87, an A / D conversion unit 88, a storage unit 89, and a CPU 90. Yes.
[0073]
The battery 80 is composed of, for example, a 9V power source and supplies power for operation to each unit. The power switch 81 is for starting power supply from the battery 80 to each unit. The display unit 82 is composed of an LCD or the like. The measurement results are displayed.
[0074]
The signal processing units 83, 84, 85, 86 respectively detect the light reception signal from the photodiode 24 of the oxygen saturation detection unit 2, the sound signal from the sound detection unit 3, and the detection signal corresponding to the resistance value of the respiration detection unit 4. The light receiving signal from the light receiving element 65 of the photo interrupter 57 of the breathing effort detecting unit 5 is received, and amplification processing and waveform shaping processing of each signal are performed.
[0075]
For example, when the perimeter of the chest is increased or decreased due to the breathing effort of the subject and the scale plate 61 moves between the light emitting element 64 and the light receiving element 65 of the photo interrupter 57, transmission and blocking of the emitted light from the light emitting element 64 are repeated. Then, a light receiving signal as shown in FIG. 12A is obtained by the light receiving element 65, and this light receiving signal is subjected to waveform shaping processing by the signal processing unit 86 to obtain a pulse signal as shown in FIG. 12B. .
[0076]
The signal processing unit 85 has a function of converting a change in resistance value into a change in voltage by applying a preset voltage between the conductive lines 45 and 48 of the respiration detection unit 4.
[0077]
Output signals from the signal processing units 83 to 86 and the body position detection unit 7 are sequentially sent to the A / D conversion unit 88 one by one by an analog switch 87 controlled by the CPU 90, A / D converted, and input to the CPU 90. The The storage unit 89 includes a ROM that stores a control program for the CPU 90 including preset fixed data and the like, and a RAM or EEPROM that temporarily stores detection data and the like. This RAM or EEPROM has a capacity capable of storing detection data of, for example, 24 hours (sleeping time is 8 hours and 3 days). Note that the control program of the CPU 90 may be supplied from the outside via an IC card or the like instead of being stored in the built-in ROM.
[0078]
As shown in FIG. 11, the CPU 90 includes a state determination unit 91, a measurement control unit 92, a biological information calculation unit 93, a respiratory effort determination unit 94, and a body position determination unit 95 as functional blocks.
[0079]
When the power switch 81 is turned on, the state determination unit 91 determines whether or not the state is in a predetermined state every predetermined period (for example, 1 second), and has the following functions (1) to (4). Have.
[0080]
(1) Function as a subject state determination means that takes in the detection signal of the body position detection unit 7 to determine whether or not the subject is in a lying state and determines that the subject is in a predetermined state when it is determined to be in a lying state .
[0081]
(2) A function as connection determination means for determining whether or not the plug 11a is connected to the jack 8a and whether or not the plug 15a is connected to the jack 8b. When it is determined that the plugs 11a and 15a are connected to one of the jacks 8a and 8b, it is determined that the state is a predetermined state. In this case, if it is determined that the plugs 11a and 15a are connected to both the jacks 8a and 8b, it may be determined to be in a predetermined state. The jacks 8a and 8b have a function of sending a detection signal to that effect to the CPU 90 when the plugs 11a and 15a are connected.
[0082]
(3) A function as a wearing determination means for judging whether or not the oxygen saturation detecting unit 2 is worn on the finger 16 of the subject P. Either one of the LEDs 23a and 23b of the oxygen saturation detection unit 2 emits light for a predetermined time (for example, 50 msec) every predetermined period (for example, 1 second), and the level of the light reception signal by the photodiode 24 at that time is below the predetermined level. If there is, it is determined that it is attached to the finger 16, and if it exceeds a predetermined level, it is determined that the LED light is passed through and received by the photodiode and is not attached to the finger 16. And if it determines with the oxygen saturation detection part 2 having been mounted | worn with the finger | toe 16 of the test subject P, it will determine with it being a predetermined state.
[0083]
(4) A function as belt wearing determination means for determining whether or not the breathing effort detector 5 is worn by the subject. When the extension amount of the spring 56 reaches a predetermined value or more, it is determined that the breathing effort detection unit 5 is attached to the subject. And if it determines with the respiratory effort detection part 5 having been mounted | worn with the test subject, it will determine with it being a predetermined | prescribed state.
[0084]
When the state determination unit 91 determines that the state is a predetermined state, the measurement control unit 92 controls the operation of each unit and starts the measurement operation. For example, as shown in FIG. Each of the LEDs 23a and 23b has a predetermined period T ₁ (For example, 10msec) and a predetermined time T ₂ The light is alternately emitted (for example, 2.5 msec), and the light emitting element 64 of the respiratory effort detection unit 5 is turned on.
[0085]
The measurement control unit 92 ends the measurement operation when the state determination unit 91 determines that the measurement state is not in a predetermined state after the start of the measurement operation.
[0086]
The biological information calculation means 93 calculates, for example, various biological information shown in the following (1) to (5) in a predetermined cycle (for example, 5 seconds) based on signals obtained from the respective units, and stores the calculation results and the like. This is stored in the unit 89.
[0087]
(1) The period T of the amplitude of the light reception signal of the photodiode 24 of the oxygen saturation detector 2 as shown in FIG. _Three (In the figure, for convenience, T _Three The pulse rate is calculated based on 2).
[0088]
(2) The oxygen saturation is calculated based on the level of each received light signal from the photodiode 24 when the LEDs 23a and 23b of the oxygen saturation detector 2 as shown in FIG. 13 emit light.
[0089]
(3) The respiratory state is determined by comparing the amplitude W of the sound signal from the sound detector 3 as shown in FIG. 14 with a preset level. For example, time t ₀ ~ Time t ₁ During this period, it is determined that the tracheal sound is stopped due to apnea, and the amplitude W ₁ Is determined to be a normal breathing sound, and the amplitude W ₂ Judge as snoring sound. Also, the peak value interval T _Four Based on the above, calculate the number of breaths per unit time or the duration of apnea.
[0090]
(4) Period T of change in resistance value in the respiration detector 4 as shown in FIG. _Five Based on the above, calculate the number of breaths per unit time or the duration of apnea. Further, the amplitude W of the peak value _Three To determine the strength of breathing.
[0091]
(5) The number of apneas per unit time and the number of apneas for each body position determined by the body position determination means 95 are calculated.
[0092]
Returning to FIG. 11, the breathing effort determination means 94 determines whether or not the subject P has a breathing effort based on the signal from the breathing effort detection unit 5. As a functional block, the reference position determination means 101 and the extension amount determination means 102. , A notification control means 103 and a movement amount calculation means 104 are provided.
[0093]
The reference position determination unit 101 stores the detected position of the scale plate 61 by the photo interrupter 57 at this time in the storage unit 89 as the reference position, assuming that the extension amount of the spring 56 is 0 when the power switch 81 is turned on. It is something to be made.
[0094]
The extension amount determination means 102 determines whether or not the extension amount of the spring 56 is within a predetermined range when the respiratory effort detection unit 5 is attached to the subject P. Further, the elongation amount determination means 102 performs the above determination at a predetermined cycle during measurement.
[0095]
This predetermined range is a range where the optimum tensile strength (elastic force) is obtained (for example, the detection range by the photo interrupter 57 is the range X shown in FIG. 5A), and the relationship between the tensile strength and the extension amount of the spring 56. Is obtained in advance based on the above and stored in the storage unit 89.
[0096]
The predetermined range can also be defined by the length of the overlapping portion of both end portions (the moving plate 55 and the detection box 51 in FIG. 4) of the belt member. For example, the length of the overlapped portion when the detection position by the photo interrupter 57 is the left end of the range X shown in FIG. 5A is the upper limit value, and the overlapped portion when the detection position is the right end of the range X This is a range in which the length is the lower limit.
[0097]
When the extension amount of the spring 56 falls within the predetermined range, the notification control means 103 notifies the subject P by displaying that fact on the display unit 82. In addition, when the extension amount of the spring 56 is out of the predetermined range during measurement, the notification control means 103 displays a message to that effect on the display unit 82 and notifies the subject P that the extension amount is out of the predetermined range. The data is stored in the storage unit 89 together with the measurement data and the elapsed time. This data is obtained by setting a preset bit to 1, for example. That is, if the setting bit is 0, it indicates that the measurement was performed within the predetermined range.
[0098]
Based on the number of pulses of the light reception signal from the light receiving element 65 of the photo interrupter 57 as shown in FIG. 12B, the movement amount calculating means 104 calculates the amount of change in the subject's chest circumference (chest circumference) due to breathing effort. By calculating, the strength of the respiratory effort, the number of times the respiratory effort has been stopped (for example, the number of times the respiratory effort has been stopped for 10 seconds or more), and the like are obtained and stored in the storage unit 89.
[0099]
The posture determination means 95 determines the posture of the subject P based on the voltage levels of the output lines U1, U2 (FIG. 9) of the posture detection unit 7. That is, when the voltage V output to the output line U1 is V = V1 in the above equation (1), it is determined to be in the supine position, and when V = V2 in the above equation (2), it is determined to be in the supine position. When V = V3 in the above equation (3), the prone position is determined, and when V = V4 in the above equation (4), it is determined as the right prone position. Further, the voltage V = 0 output to the output line U1 and the voltage V = V output to the output line U2 _CC In the case of the test subject P, it is determined that the subject P is in a lying state, and when the voltages V output to the output lines U1 and U2 are both V = 0, it is determined that the subject P is standing.
[0100]
The oxygen saturation detection unit 2, the sound detection unit 3, the respiration detection unit 4, the respiratory effort detection unit 5 and the body position detection unit 7 constitute a biological information detection unit, and the measurement control unit 92 and the biological information calculation unit 93 are measurement control units. Configure.
[0101]
Next, the measurement operation procedure of the respiratory function measuring apparatus 1 will be described using the flowchart of FIG.
[0102]
First, before the subject P goes to bed, the respiratory function measuring device 1 is worn by the subject P (# 110). That is, the oxygen saturation detection unit 2 is fixed by being sandwiched between fingertips, and after the measurement processing unit 8 is attached to the wrist on which the oxygen saturation detection unit 2 is attached, the plug 11a of the connection cable 11 is connected to the measurement processing unit 8. To the jack 8a. Next, the respiratory effort detector 5 is wrapped around the chest, the sound detector 3 is attached to the throat, the respiratory detector 4 is attached to the nose, and the plugs 12a and 13a of these connection cables 12 and 13 are connected to the relay 6 Connect to the jacks 6 a and 6 b and connect the plug 15 a of the relay cable 15 of the relay unit 6 to the measurement processing unit 8.
[0103]
Next, when the power switch 81 is turned on (# 120), it is determined by the state determination means 91 whether or not it is in a predetermined state (# 130). When it is determined that the state is a predetermined state (YES in # 130), the measurement operation is started, and various biological information is calculated by the biological information calculation means 93 and the calculation result is stored in the storage unit 89. Is performed (# 140).
[0104]
Next, during the measurement, it is determined by the state determination means 91 at a predetermined cycle (# 150). If it is determined that the state is the predetermined state (YES at # 150), the measurement operation is continued. If it is determined that the state is not the predetermined state (NO in # 150), the measurement operation ends (# 160). When the subject P wakes up, the power switch 81 is turned off (# 170).
[0105]
In this way, it is determined whether or not the state is determined by the state determination unit 81, and the measurement operation is started when the state is determined to be the predetermined state. The measurement operation can be started. Thereby, useless data can be stored in the storage unit 89, and unnecessary power consumption can be reduced. Moreover, since there is little useless data in the data stored in the storage unit 89, the analysis performed by the expert based on the stored data in the storage unit 89 at a later date can be efficiently advanced.
[0106]
In addition, this invention is not restricted to the said embodiment, The following modification (1)-(5) is employable.
[0107]
(1) In the above embodiment, the measurement operation is started and ended by determining whether or not the state is a predetermined state. However, the present invention is not limited to this, and the measurement operation is started when the power switch 81 is turned on. Data storage may be started after it is determined to be in a predetermined state.
[0108]
(2) In FIGS. 1 and 10, the power switch 81 may not be provided, and only the state determination by the state determination unit 91 may be performed at all times. According to this embodiment, it is possible to reliably prevent forgetting to turn on or off the power switch. In this case, an increase in power consumption can be suppressed by increasing the period of state determination by the state determination unit 91 to 10 seconds or 30 seconds.
[0109]
(3) In the above embodiment, the measurement control unit 92 starts the measurement operation as soon as the state determination unit 91 determines that the state is a predetermined state. However, the measurement control unit 92 is not limited to this. The elapsed time from the time point determined to be in the predetermined state may be counted by the CPU 90, and the measurement operation may be started after a predetermined time (for example, 5 minutes) has elapsed. According to this aspect, the measurement operation can be started from a time closer to the time when the subject P goes to sleep.
[0110]
(4) The measurement control unit 92 starts the measurement operation when the state determination unit 91 determines that the state is a predetermined state, and automatically ends the measurement operation after a predetermined time (for example, 8 hours) has elapsed. Good. Further, the measurement operation may be performed for a predetermined time from a predetermined time based on a built-in clock of the CPU 90. These predetermined times and predetermined times may be fixed values or changeable by the subject.
[0111]
(5) As shown by the alternate long and short dash line in FIG. 10, the selection switch 111 is provided, and the CPU 90 determines, based on on / off of the selection switch 111, that the measurement operation start time is determined as a predetermined state, a predetermined time, A function as selection control means for selecting the switch 81 from when it is turned on may be achieved.
[0115]
【The invention's effect】
As explained above, according to the present invention, it is detected that the subject is lying down. Only if Since it is determined to be in a predetermined state, measurement operations are not performed when the subject is standing. ,Nothing Unnecessary power consumption can be suppressed.
[Brief description of the drawings]
FIG. 1 is a diagram showing a state in which a respiratory function measuring device, which is an embodiment of a respiratory effort detection device according to the present invention, is attached to a subject.
FIG. 2 is a diagram illustrating a configuration of an oxygen saturation detection unit.
FIG. 3 is a diagram illustrating a configuration of a respiration detection unit.
FIG. 4 is a diagram illustrating an internal configuration of a detection box of a respiratory effort detection unit.
5A is a front view of a scale portion, and FIG. 5B is a cross-sectional view showing a positional relationship of the scale portion.
6A and 6B are diagrams showing a configuration of a body position detection unit, in which FIG. 6A is a perspective view of an appearance, FIG. 6B is a cross-sectional view of a rotational position sensor, and FIG. is there.
FIGS. 7A and 7B are diagrams showing an arrangement state of a body position detection unit when a subject is in a supine position.
FIG. 8 is a diagram showing a short-circuit state of a contact with respect to a rotational position of a rotational position sensor.
FIG. 9 is a circuit diagram showing a detection circuit of a body position detection unit.
FIG. 10 is a block diagram showing an electrical configuration of the respiratory function measuring device.
FIG. 11 is a block diagram illustrating functional blocks of a CPU.
12A is a diagram illustrating a light reception signal obtained from a light-receiving element of a photo interrupter, and FIG. 12B is a diagram illustrating a signal obtained by performing waveform shaping processing on the light reception signal illustrated in FIG.
FIG. 13 is a diagram showing a light emission state of an LED and a light reception signal of a photodiode of an oxygen saturation detection unit.
FIG. 14 is a diagram illustrating a sound signal from a sound detection unit.
FIG. 15 is a diagram illustrating a change in resistance value in a respiration detection unit.
FIG. 16 is a flowchart showing a measurement operation procedure of the respiratory function measuring apparatus.
[Explanation of symbols]
1 Respiratory function measuring device
2 Oxygen saturation detector
3 Sound detector
4 Respiration detector
5 Respiratory effort detector
7 Position detection unit
8 Measurement processing section
6a, 6b, 6c, 8a, 8b Jack
11a-14a plug
89 Memory
90 CPU
91 State determination means
92 Measurement control means
93 Biological information calculation means
94 Respiratory effort determination means
95 Position determination means

Claims (6)

In a biological information measuring device that is attached to a subject and includes at least one biological information detection unit that detects information related to the biological body of the subject and a measurement control unit that performs predetermined measurement control.
State determination means for determining whether or not the device is in a predetermined state;
A body position detecting means for detecting the body position of the subject, which is one of the biological information detecting means,
When the body position detection means detects that the subject is lying, the state determination means determines that the predetermined state is present,
The biological information measuring apparatus according to claim 1, wherein the measurement control unit performs the predetermined measurement control only when the state determination unit determines that the state is the predetermined state. The biological information measuring device according to claim 1,
The predetermined measurement control, the biological information measuring device, characterized in that the shall carry out the detection operation by the biological information detection means other than the position detecting means. The biological information measuring device according to claim 2,
The biological information measuring device according to claim 1, wherein the predetermined measurement control is to end the detection operation after a predetermined time has elapsed after starting the detection operation. The biological information measuring device according to claim 1,
A storage unit for storing measurement data;
The biological information measuring device, wherein the storage unit stores measurement data measured by the predetermined measurement control. In a biological information measuring device that is attached to a subject and includes at least one biological information detection unit that detects information related to the biological body of the subject and a measurement control unit that performs predetermined measurement control.
Selection control means for selecting the start point of the predetermined measurement control;
State determination means for determining whether or not the device is in a predetermined state;
A body position detecting means for detecting the body position of the subject, which is one of the biological information detecting means,
When the start time is selected by the selection control means to perform predetermined measurement control according to the detection result of the body position detection means,
When the body position detection means detects that the subject is lying, the state determination means determines that the predetermined state is present,
The biological information measuring apparatus according to claim 1, wherein the measurement control unit performs the predetermined measurement control only when the state determination unit determines that the state is the predetermined state. In a biological information measuring device that is attached to a subject and includes at least one biological information detection unit that detects information related to the biological body of the subject and a measurement control unit that performs predetermined measurement control.
Power input means;
A storage unit for storing measurement data;
A body position detecting means for detecting the body position of the subject, which is one of the biological information detecting means,
Only when the body position detecting means detects that the subject is lying after the measurement control means starts the predetermined measurement control by the power input by the power input means, the storage unit Stores the measurement data measured by the predetermined measurement control.

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