JP2000102515A - Physical condition detector - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily and precisely detect the physical condition of a subject lying on bedding such as a bed by building an electromagnetic wave transmitting and receiving sensor in the bedding for the subject. SOLUTION: A microwave transmitting and receiving sensor 11 emits microwaves to the breast on the like of a subject lying on bedding such as a bed 1 or the like or sleeping thereon, calculates the displacement of the breast on the like of the subject on the basis of the microwave reflected from the breast on the like of the subject, and detects the body state such as heart rate and/or respiration rate of the subject on the basis of the calculation result. The microwave transmitting and receiving sensor 11 is built in the bedding such as bed 1 for the subject, and the subject is never accompanied by the relative displacement based on a large body motion other than minute body motion by heart beat or breathing to the microwave transmitting and receiving sensor 11. Accordingly the physical condition of the subject can be easily and precisely detected by use of the microwave transmitting and receiving sensor 11 from the displacement of the minute body motion by the heart beat or breathing of the subject.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a body condition detector suitable for detecting a body condition of a subject while the subject is asleep without burdening the subject.

[0002]

2. Description of the Related Art Conventionally, in order to monitor the heart function or cardiopulmonary function of a subject lying on a bed such as a bed, electrodes are attached to the body surface of the subject and the heart function is obtained from the waveform of an electrocardiogram. A thermistor is provided on the nose of the subject, and the respiratory rate is determined from a change in the temperature detected by the thermistor.

[0003]

However, in the prior art in which the electrodes and the thermistor are fixed to the body of the subject, not only the physiological and mental burdens on the subject are large but also skin irritation such as rash occurs. There is an inconvenience.

Japanese Patent Application Laid-Open No. 7-59757 discloses that a driver of a vehicle, which is a subject, is irradiated with electromagnetic waves, and based on reflected electromagnetic waves from the chest or abdomen of the driver, the patient's chest or abdomen is exposed. It discloses a method of measuring displacement and detecting a physical condition such as a heart rate or a respiratory rate of the subject based on the measurement result. However, this conventional technique only suggests that a body condition of a subject, which is constantly accompanied by large body movements due to driving of a vehicle, is detected by using a sensor spaced from the front of the subject. In addition, there is no suggestion that the body condition of a subject lying on bedding such as a bed can be detected simply and with high accuracy. Further, according to this conventional technique, there is no consideration to issue a warning when there is an abnormality in the physical condition of the subject.

An object of the present invention is to simply and accurately detect the physical condition of a subject lying on a bed such as a bed.

Another object of the present invention is to be able to issue a warning when there is an abnormality in the physical condition of a subject.

[0007]

According to a first aspect of the present invention, there is provided an electromagnetic wave transmitting / receiving sensor for irradiating a subject with electromagnetic waves and receiving electromagnetic waves reflected from the body of the subject, and an electromagnetic wave transmitting / receiving sensor. A displacement amount calculation unit that calculates the displacement amount of the subject's body based on the received signal of the subject, and the body that can detect the body state of the subject based on the displacement amount calculated by the displacement amount calculation unit A state detector, wherein the electromagnetic wave transmission / reception sensor is built in bedding for a subject.

According to a second aspect of the present invention, in the first aspect of the present invention, a heart rate and / or a respiratory rate of the subject are calculated based on the displacement calculated by the displacement calculator. This is provided with a heart rate / respiration rate calculation unit that performs the calculation.

According to a third aspect of the present invention, in addition to the first or second aspect of the present invention, there is further provided a monitoring device for monitoring the detection result of the physical condition of the subject, and the monitoring result is abnormal. And a warning device for issuing a warning when there is a warning.

[0010]

According to the first and second aspects of the present invention, the following effects are obtained. The electromagnetic wave transmission / reception sensor irradiates the subject lying on the bedding such as the bed, the chest of the sleeping subject with electromagnetic waves and the like, and based on the reflected electromagnetic waves from the subject's chest and the like,
The displacement of the subject's chest and the like is calculated, and based on the calculation result, the subject's physical condition such as heart rate and / or respiratory rate is detected.

An electromagnetic wave transmission / reception sensor is built in a bed or the like for a subject, and the subject applies relative displacement to the electromagnetic wave transmission / reception sensor based on a large body motion other than a minute body motion due to heartbeat or breathing. Not accompanied. Therefore, the displacement of the minute movement due to the heartbeat or breathing of the subject can be detected with high accuracy using the electromagnetic wave transmission / reception sensor, and the body state of the subject can be detected simply and with high accuracy.

The electromagnetic wave transmission / reception sensor does not require direct contact or close contact with the subject's body, and has a certain wide area as an effective transmission / reception area. Therefore, the electromagnetic wave transmission / reception sensor is built only on a bed such as a bed, for example, at a position roughly corresponding to the chest when the subject lays down, so that the position where the subject actually lays is slightly shifted. In addition, the physical condition of the subject can be detected simply and with high accuracy.

According to the third aspect of the present invention, the following operations are provided. It has a monitoring device for monitoring the detection result of the physical condition of the subject, and a warning device for issuing a warning when there is an abnormality in the monitoring result. Therefore, a warning can be issued when there is an abnormality in the physical condition of the subject.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a perspective view showing a use state of a body condition detector, FIG. 2 is a block diagram showing a structure of the body condition detector, FIG. 3 is a graph showing an output waveform of a displacement calculator.
FIG. 4 is a graph showing the extraction state of the heart rate component and the respiratory component in the heart rate / respiration rate calculation unit.

As shown in FIGS. 1 and 2, the body condition detector 10 includes a microwave transmission / reception sensor 11, an A / D converter 1
2. Displacement amount calculation unit 13, heart rate / respiration rate calculation unit 14, heart rate / respiration rate monitoring device 15, display device 16, warning device 1
7.

As shown in FIG. 1, the microwave transmission / reception sensor 11 is built in a bed 1 for a subject, and is located at a single position roughly corresponding to the chest when the body of the subject lies on the bed 1. Are located. The microwave transmission / reception sensor 11 is provided on a rigid portion below the mattress of the bed 1 and does not give a subject a sense of incompatibility. The microwave transmission / reception sensor 11 constantly irradiates the subject on the bed 1 with microwaves and receives reflected electromagnetic waves from the body of the subject.

The A / D converter 12 converts the reception result of the microwave transmission / reception sensor 11 from an analog signal to a digital signal.

The displacement calculator 13 calculates the displacement of the subject's body based on the digital signal of the A / D converter 12 corresponding to the reception signal of the microwave transmission / reception sensor 11.
This displacement amount is a displacement amount corresponding to minute body movement due to the heartbeat or breathing of the subject on the bed 1. FIG. 3 shows the output waveform of the displacement amount calculation unit 13, where the horizontal axis represents time and the vertical axis represents the displacement amount. The sampling interval was 0.005 seconds.

The heart rate / respiration rate calculating section 14 calculates the physical condition of the subject based on the displacement calculated by the displacement calculating section 13.
Specifically, the heart rate and the respiration rate are calculated. The heart rate / respiration rate calculation unit 14 applies a low-pass filter and a high-pass filter to the output waveform of the displacement amount calculation unit 13 using the difference between the frequency components of the heart rate and the respiration rate. That is, the respiratory component (respiratory rate frequency component) of the output waveform of the heart rate / respiratory rate calculator 14 is extracted using, for example, a 0.3 Hz low-pass filter, and the heart rate component (heart rate frequency component) is extracted, for example. Extract using a 1Hz high-pass filter.
Then, the heart rate / respiratory rate calculating unit 14 sets a constant threshold with respect to the vertical axis for the respiratory component extracted by the low-pass filter, counts the time interval between adjacent peak values in the threshold, and calculates the respiratory rate. Is calculated. Also, the heart rate / respiration rate calculation unit 14 sets a constant threshold with respect to the vertical axis for the heart rate component extracted by the high-pass filter, counts the time interval between adjacent peak values in the threshold, and calculates the heart rate / respiration rate. Is calculated.

The heart rate / respiration rate monitoring device 15
The heart rate and the respiratory rate, which are the calculation results of the respiratory rate calculating unit 14, are constantly monitored, and when the calculated values are above or below a certain reference value for a certain period of time, this abnormality is displayed on the display device 16, The warning device 17 gives a warning. Regarding the respiratory rate, for example, if breathing is not observed for 1 minute or more, the warning device 1
7, a warning sound is emitted, and a subject such as a sleeping patient is caused by the warning sound (the apnea syndrome is a disease peculiar to sleep, and usually has a respiratory arrest of about 30 seconds to 2 minutes. As for the heart rate, for example, 40 to 160 heartbeats / minute (0.37 seconds to 1.5
(Seconds), a warning is issued by the warning device 17 (this heart rate setting range is a general heart rate range. If the heart rate setting range falls below this, it is said to be the top rhythm, and if it exceeds this range, it is called tachycardia). ing).

Accordingly, the body condition detector 10 operates as follows. (1) The microwave is transmitted from the microwave transmission / reception sensor 11 to the subject on the bed 1.

(2) The microwave transmitting / receiving sensor 11 receives the reflected microwave from the subject.

(3) The signal received by the microwave transmission / reception sensor 11 is converted into a digital signal by the A / D converter 12.

(4) From the converted data of the A / D converter 12,
The displacement calculator 13 calculates the displacement of the subject's body.

(5) From the displacement calculated by the displacement calculator 13,
A heart rate / respiration rate calculation unit 14 calculates a heart rate and a respiration rate.

(6) The heart rate / respiration rate monitoring device 15
The calculation result of the heart rate / respiration rate calculation unit 14 is monitored, and when the calculated heart rate and respiration rate become equal to or more than a certain value, the abnormality is displayed on the display device 16 and a warning device 17 warns.

Therefore, according to the present embodiment, the following effects are obtained. The microwave transmission / reception sensor 11 irradiates microwaves to a subject lying on bedding such as the bed 1 and a chest of a sleeping subject, and converts the reflected microwaves from the chest of the subject to the microwave. Based on the calculated result, the displacement of the chest and the like of the subject is calculated, and based on the calculation result, the body state of the subject such as the heart rate and / or respiratory rate is detected.

The microwave transmission / reception sensor 11 is built in bedding such as the bed 1 for the subject, and the subject responds to the microwave transmission / reception sensor 11 with a large body motion other than the micromotion caused by heartbeat or breathing. Without relative displacement based on
Therefore, the displacement of the micromotion due to the heartbeat or breathing of the subject,
Highly accurate detection using the microwave transmission / reception sensor 11,
The physical condition of the subject can be detected simply and with high accuracy.

The microwave transmission / reception sensor 11 does not require direct contact or close contact with the subject's body.
In addition, a certain wide range is set as an effective transmission / reception area. Therefore, the microwave transmission / reception sensor 11 is simply built in a position corresponding to a chest or the like when the subject lays down on the bedding such as the bed 1 so that the position where the subject actually lays down may be slightly different. Even if it deviates, the physical condition of the subject can be detected simply and with high accuracy.

The apparatus has a monitoring device 15 for monitoring the detection result of the physical condition of the subject, and a warning device 17 for issuing a warning when the monitoring result has an abnormality. Therefore, a warning can be issued when there is an abnormality in the physical condition of the subject.

Although the preferred embodiment of the present invention has been described in detail with reference to the drawings, the specific configuration of the present invention is not limited to this preferred embodiment, and the design may be changed without departing from the scope of the present invention. The present invention is also included in the present invention. For example, in the present invention, the bedding incorporating the electromagnetic wave transmission / reception sensor is not limited to a bed, and may be a futon or the like.

In the present invention, the present invention is not limited to detecting the physical condition such as the heart rate and respiratory rate of the subject, but may be detecting other physical conditions such as the body position.

[0033]

As described above, according to the present invention, the physical condition of a subject lying on bedding such as a bed can be detected simply and with high accuracy.

Further, according to the present invention, a warning can be issued when there is an abnormality in the physical condition of the subject.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a use state of a body condition detection tool.

FIG. 2 is a block diagram illustrating a configuration of a body condition detection tool.

FIG. 3 is a graph showing an output waveform of a displacement amount calculating unit.

FIG. 4 is a graph showing an extraction state of a heart rate component and a respiratory component in a heart rate / respiration rate calculation unit.

[Explanation of symbols]

 Reference Signs List 1 bed (bedding) 10 body condition detector 11 microwave transmission / reception sensor (electromagnetic wave transmission / reception sensor) 13 displacement amount calculation unit 14 heart rate / respiration rate calculation unit 15 monitoring device 17 warning device

Claims (3)

[Claims] An electromagnetic wave transmitting / receiving sensor for irradiating a subject with electromagnetic waves and receiving electromagnetic waves reflected from the body of the subject, and a displacement amount of the body of the subject based on a reception signal of the electromagnetic wave transmitting / receiving sensor. And a displacement amount calculating unit that calculates a displacement amount calculated by the displacement amount calculating unit. The body condition detecting device detects a body condition of the subject based on the displacement amount calculated by the displacement amount calculating unit. Body condition detector built into bedding for children. 2. The body according to claim 1, further comprising a heart rate / respiration rate calculation unit that calculates a heart rate and / or a respiration rate of the subject based on the displacement amount calculated by the displacement amount calculation unit. State detector. 3. The apparatus according to claim 1, further comprising a monitoring device for monitoring a result of detecting the physical condition of the subject, and a warning device for issuing a warning when there is an abnormality in the monitoring result. Body condition detector.