JPS62253034A - Sleeping state judge apparatus - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field] The present invention relates to an IllI sleep state determining device, more specifically, an Ill! The present invention relates to a sleep state determination device.

[Background technology 1] As social life has become more complex in recent years, I
I! There is a tendency for sleep disorders to increase, and sleep management has become important. In particular, sleep management is expected to play an important role in the health management of hospitalized patients in hospitals.

The state of sleep involves rapid eye movement (REM).
It is known that there are two sleep states: a sleep state (obementsleep) II and other sleep states, and that there are four levels of sleep depth other than the REM sleep state. The stages of sleep depth are from shallow to shallow: stage 1 (1), stage 2 (II), etc.
The order is... In one II sleep, one cycle is 60 to 90 minutes of sleep including REM sleep state and other sleep states, and this cycle is repeated several times.

In other words, during 6 o'clock IWl sleep, this cycle is repeated about 4 times. In order to judge the state of sleep, conventionally the state of brain waves, electroencephalograms, and electromyography were continuously recorded on chart paper, and judgments were made from the waveforms. Measuring sleep status required 400 meters of chart paper. In addition, to determine sleep state, it is necessary to detect the depth of sleep and the regularity of changes in sleep state, but as described above, the depth and regularity of sleep can be determined from continuously recorded waveforms. It was a very tedious task to do.

[Object of the Invention] The present invention has been made in view of the above points, and its main purpose is to provide a sleep state determination device that allows changes in sleep state to be easily identified. It's about doing.

[Disclosure of the Invention] (Structure) The sleep state determination device according to the present invention includes an IjSl brain wave detection means that detects brain waves from the top of the head, and a t+! The brain wave detection means of tB2, which detects brain waves from the first part, the eye movement detection means, which detects eye movements, and the output level relationship between the brain wave detection means of Ijil and the second brain wave detection means are compared. This device is equipped with a determining means for identifying the type of brain waves, and allows changes in sleep state to be easily determined from identifying the type of brain waves.

(Example) The basic principle of the present invention is based on the fact shown in FIG. 2(a). That is, FIG. 2 (&) shows an example of changes in sleep state, where KE indicates the awake state, REM indicates the REM sleep state, and I to ■ indicate the stages of sleep depth. , α→ indicates the time when α waves appear, and S→ indicates the time when spindle waves appear.
In this way, alpha waves appear in a state of relaxation during wakefulness and in a state of absentminded sleep up to the tB1 stage (1), and spindle waves appear in a state of sleep where one can take a quick breath. Since it appears in stage (II), it is possible to determine the state of sleep by distinguishing between alpha waves and spindle waves when they occur, and in addition, detecting eye movements (EOG) to determine REM sleep state. It seems possible. By the way, alpha waves and spindle waves both have frequencies of about 8 to 14 Hz,
It is known that alpha waves are detected at a high level from the back of the head, and spindle waves first appear at a high level from the parietal region and gradually become detected in the frontal region. However, in order to separate alpha waves and spindle waves, brain waves are detected in the occiput and parietal regions, and a predetermined signal (weighting, etc.) that is set in advance takes into account the level difference between alpha waves and spindle waves. Based on the relationship between the magnitudes of The circuit described below is constructed based on this principle.

As shown in FIG. 1, brain waves are detected by unipolar derivation using electrodes 1 m and 1 b provided at the top of the head and the back of the head. Each type mla, lb is a band pass filter 2 at
The bandpass filters 2a and 2b pass only signals in a band of 8 to 14 Hz. A zero-order absolute value circuit 3a, from which signals considered to be alpha waves or spindle waves are extracted in this way;
3b makes the output of the bandpass filters 2a and 2b only positive No. 46. The brain waves detected from the back of the head and passed through the absolute value circuit 3b are input to the comparator circuit 4, and if the brain waves are at or above the set level Vref (equivalent to 7 μV of brain waves), a trigger is applied to the delay circuit 5 consisting of a one-situ multi-by-break circuit. to generate a switching pulse with a predetermined time width.

On the other hand, the outputs of the absolute value circuits 3a and 3b are input to peak hold circuits 6a and 6b, respectively, and the peak hold circuits 6lit6b are inputted from the rising edge of the switching pulse output from the delay circuit 5. Samples the input signal and holds the peak value until the falling edge of the switching pulse. In this way, Beakhole 1 circuit 6 can be used only during the period when brain waves are appearing.
At S b can be operated. The output of each peak hold circuit 6 at Sb is connected to a date circuit 8m, which is composed of a pair of W-adders 7a, -7b and diodes Da, Db connected to the output terminals of each adder 7It, 7b. , 8b. That is,
The output terminal of the peak hold circuit 61.6b is connected to the non-reverse input terminal of each adder 7g, 7b, and the output of the delay circuit 5 is connected to the inverting input of each adder 7g, 7b. The signal is inputted via the connection circuit 9. Therefore, W is applied only during the period when the peak hold circuits 6a and 6b are operating.
The outputs of 57a and 7b become positive, and as a result, the output of the peak hold circuit 61t6b becomes the diode Da.
, Db. The outputs of the date circuits 8a and 8b are sent to a judgment circuit 1 consisting of a pair of comparison circuits 10a and 10b.
1, and when the level of the brain waves from the back of the head is higher than the level of the brain waves from the top of the head, it is assumed that the a wave has been detected, and the voltage is set to Vl by the comparison circuit 10a of #1.
If the magnitude relationship between the two brain waves is opposite, it is assumed that spindle waves have been detected, and the second comparator circuit 10b provides an output with a voltage of 2.

On the other hand, for eye movement, an electrode 20 placed near the eye is connected to the input terminal of an amplifier circuit 21, and the amplifier circuit 20 amplifies the electric current, and then performs second-order differentiation using a pair of differentiating circuits 22 and 23. The absolute value is determined by the absolute value circuit 24. In this way, the motion of the Wi ball is detected so as to be independent of the moving direction of the 11 balls, and if the amount of momentum is greater than a predetermined value, the comparator circuit 25 provides an output with a voltage of . Here, the voltage relationship is V s > V + > V 2
If you set it so that it becomes , and record it with a RBI recorder,
As shown in Fig. 2(b), at each point in time when the a-wave or spindle wave appears, when the momentum of the ball (711) is greater than a predetermined value, the output of each voltage value vl~■ is obtained. Therefore, it is possible to distinguish between the waking state, the first stage sleep state, the second stage sleep state, and the REM sleep state, as well as patterns of changes in the sleep state.

Furthermore, by using the α recorder in this manner, it is not necessary to record continuously as in the conventional method, and therefore a large amount of chart paper is not required.

[Effect of the invention 1 As described above, the present invention provides a first method for detecting brain waves from the top of the head.
the output level of the brain wave detection means, the second brain wave detection means for detecting brain waves from the back of the head, the eye movement detection means for detecting eye movements, the first brain wave detection means, and the second brain wave detection means; Since it is equipped with a judgment means that compares the relationship and identifies the type of brain waves, there is no need to continuously record the state of brain waves as in the past, and it is possible to compare the relationship between the levels of brain waves detected at each site. This method has the advantage that stages of sleep state and patterns of changes in sleep state can be easily identified by eye movements. Further, it has the advantage that the type of brain waves can be detected without continuously recording brain waves, and the sleeping state can be easily recorded.

[Brief Description of the Drawings] Figure 1 is a block diagram showing one embodiment of the present invention, and Figure 2 (
a) and (b) are explanatory diagrams of the same operation. 1 m, 1 b are electrodes, 21.2 b is /<7 do pass filter, 3 m, 3 b are absolute value circuits, 4 is a comparator,
5 is a slow χ circuit, 6 m, 6 b is a peak hold circuit, 7 m, 7 b is an adder, 8 at 8 b is a date circuit, 9 is an inversion circuit, 10 a, 10 b are comparison circuits, 1
1 is the judgment circuit, 20 is 1! pole, 21 is an amplifier circuit, 22.
23 is a differential circuit, 24 is an absolute value circuit, and 25 is a comparator. Agent Patent Attorney Ishi 1) Chief Seven Procedures Amendment (Voluntary) July 18, 1985

Claims (1)

[Claims] (1) A first brain wave detection means that detects brain waves from the top of the head, a second brain wave detection means that detects brain waves from the back of the head, an eye movement detection means that detects eye movements, and a first brain wave detection means. A sleep state determining device comprising: determining means for identifying the type of brain waves by comparing the magnitude relationship of the output level with the second brain wave detecting means.