JP3451729B2 - Monitoring device - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a monitoring device for monitoring a bed condition of a patient in a hospital or facility or a sleeping person.

[0002]

2. Description of the Related Art The inventors previously devised the following device as this type of monitoring device. As shown in FIG. 9, the bedding 14 is provided with the vibration detecting means 15, and as shown in the block diagram of FIG. 10, the signal converting means 1 of the signal processing unit 16a.
7, the time series data was converted, and the calculation means 18 calculated the statistic amount. Then, the determination means 19 determines whether the person is on the bed or not on the bed based on the statistical amount. The determination means 19 has two thresholds,
The dead zone is provided between the first threshold value T1 and the second threshold value T2 for the determination. The determination result was reported to the monitor by the reporting means 20.

In another configuration, as shown in FIG.
The vibration detecting means 15 is arranged at multiple points on the bedding 14, and the signal processing unit 16b is configured such that the signal processing unit 16b corresponds to the vibration detecting means 15.

[0004]

However, the monitoring device of the above technique has the following problems. When determining the presence of the bed from the state of the absence of bed by the conventional monitoring device, the vibration detection unit 15 detects the vibration generated when a person enters the floor,
The signal is converted into time series data by the signal conversion means 17,
The statistic amount V15 calculated by the calculation means 18 is required to obtain a signal that exceeds the second threshold value T2. However, as shown in FIG. 12, when the user is sitting on the bed, such as at the end of the bed, away from the vibration detecting means 15 disposed in the bed, or when the user is an old person or a disabled person, For some reason, such as slow motion, the vibration that occurs when entering the bed is small, and a situation occurs in which a signal is difficult to be detected by the vibration detection means 15 provided in the bedding, as shown in FIG. The statistic amount V15 obtained from the output signal of the vibration detecting means 14 can only obtain a value that finally exceeds the first threshold value T1. In this case, the determination of the presence or absence of the bed by the determination means 19 should be as shown in (b), but as in the period of Δt in (c), the erroneous determination of the absence of bed is actually made. I had to do. In order to eliminate this erroneous determination, it is conceivable to dispose multiple vibration detecting means 15 as shown in FIG. 11 to eliminate an undetectable region for detecting vibration when entering the floor. However, the configuration becomes complicated, the manufacturing cost is high, and the number of man-hours is increased at the time of manufacturing.

Further, depending on the bedding installation conditions, there are some areas where the vibration detecting means 15 need not be arranged because the direction facing the wall or the like is fixed or the fence is fixed. Then, the presence of the vibration detection means 15 at this portion causes a problem of causing an erroneous determination. Also,
In some cases, costs, man-hours, etc. are wasted during production.

A first object of the present invention is to provide a vibration detecting means so as to surely detect a vibration signal when a person enters the bedding with a simple structure, so that an error of absence after entering the bed can be avoided. It is to provide a monitoring device that does not make a determination.

A second object of the present invention is to provide a monitoring device which does not make an erroneous determination when it is attached to a specific bedclothes, because it has a lean structure.

[0008]

In order to achieve the first object of the present invention, a linear or band-shaped ambient vibration detecting means arranged around the bedding and a central vibration arranged at the center of the bedding. A detection means; a signal conversion means means for converting the output signals of the ambient vibration detection means and the central vibration detection means into time series data; and an operation means for calculating a variance value of the time series data collected by the signal conversion means. , Comparing the variance value calculated by the computing means with a threshold value provided in advance
It is provided with a determination means for determining the presence or absence of a person on the bedding .

Further, in order to achieve the second object, a linear or strip-shaped ambient vibration detecting means is arranged around at least one side of the bedding.

[0010]

The present invention operates as follows with the above construction. When a person tries to enter the bedding, he / she always sits around the bedding or puts his / her hand on the bed, and the linear or band-shaped ambient vibration detection means arranged around the bedding does not affect the behavior of the bedding. Even if it is performed at the site, the body movement signal generated when the person enters the bed is surely detected and the signal is output. When a person enters the bed, the central vibration detecting means arranged at the center of the bedding detects the signal of the vibration generated by the body movement and outputs the signal. These signal outputs are collected as time series data by the signal conversion means, and the calculation means calculates the variance value using this data. Determination means, the variance
Based on this, the presence or absence of a person on the bedding is determined by comparing with a threshold value set in advance .

[0011]

EXAMPLE A first example of the present invention will be described below.

FIG. 1 shows a block diagram of a first embodiment of the present invention, and FIG. 2 shows an external view thereof. In FIG. 1, 1 is a bed, 2 is a bed pad, and 3a is one linear or band-shaped ambient vibration detecting means arranged over four sides around the bed pad. Reference numeral 4 is a central vibration detecting means arranged in the central portion of the bed pad. Here, a piezoelectric element is used as a means for detecting vibration. The piezoelectric element is formed by forming a polymer piezoelectric material such as polyvinylidene fluoride (PVDF) into a thin film shape and attaching a flexible electrode film on both surfaces, and is formed into a tape shape. When this piezoelectric element is attached to bedclothes such as the bed pad 3, when a person is deformed by body motion, rolling of the heart, or vibration caused by heartbeat or respiration, a voltage is generated by the piezoelectric effect and a signal is output. . Reference numeral 5 denotes a signal processing unit which incorporates signal converting means 6a and 6b, calculating means 7a and 7b, and determining means 8. The signal processing unit 5 is attached to the side or back of the bed 1.
The signal conversion means 6 includes a band amplification section 9, an A / D conversion section 10,
A timer 11 and a temporary data storage 12 are provided. Thirteen
Is a reporting means.

The operation of the above configuration will be described below. When a person tries to enter the bed, the vibration generated at that time is detected by the ambient vibration detecting means 3a arranged around the bed pad 2. When the person enters the bed 1, the central vibration detecting means 4 detects the body movement. The output signals sent from the ambient vibration detection means 3a and the central vibration detection means 4 are respectively signal conversion means 6 incorporated in the signal processing unit 5.
a, 6b. The band amplification unit 9 extracts the body movement signal. This analog signal is A / D-converted in the A / D converter 10 at each time measured by the timer 11.
The digital data is temporarily stored in the data temporary storage unit 12. Using the accumulated data, the calculation means 7a,
7b, ambient vibration detection means 3a, central vibration detection means 4
The variance values V3 and V4 for each are calculated. The determination means 8 uses a preset determination threshold value based on the maximum value Vmax of each of the calculated variance values V3 and V4 for each time.
Determine absence. Here, the determination means has two threshold values, and a dead zone is provided between the first threshold value T1 and the second threshold value T2. The determination result determined by the determination means 8 is presented by the notification means 13 to the monitor at the remote location.

A signal obtained from a person's behavior at bedtime at a certain time will be described with reference to FIG. (A) is a variance value V3 obtained based on the output signal of the ambient vibration detecting means 3a, and (b) is a variance value V obtained by the central vibration detecting means 4.
4, (c) is the maximum value of V3 and V4, which is Vmax. The vertical axis represents the magnitude of the variance value. (D) is determination means 8
According to the determination result by, ON means being in bed and OFF means not being in bed. The horizontal axis indicates time, which is when entering the bed (t1), sitting on the bedside edge (t1 to T2), lying on the bedding and lying on its back (t2 to t3), lying on its back (t3 to t4), and getting up (t4). Sit at the foot of the bed (t4 to t5) and leave the bed (t5). As shown in FIG. 3, in FIG. 3A, signals upon entering and leaving the bed and signals regarding body movements such as the sitting state are clearly detected. In combination with V4, Vmax is used as the basic data for determination. Therefore, there is no error in the determination result of (d).

The following effects can be obtained by the above operation. Since it is equipped with one linear or strip-shaped ambient vibration detection means arranged around the bedding, it is possible to reliably detect the vibration when entering the bed, and also to sit on the edge of the bedside or feet of the bedding. Since it is possible to detect the body motion signal in such a state, there is no erroneous determination in the presence / absence of bed. Further, since only one vibration detecting means is added, the monitoring device can be realized with a simple configuration, and the manufacturing cost, man-hours, etc. can be suppressed to be significantly lower than those of the conventional monitoring device shown in FIG. Moreover, since the configuration of the signal processing unit 5 can be simplified, the entire apparatus can be downsized. Also, 1
Since the two vibration detecting means surround the circumference, it has no directivity, and the user can use it without limiting the use conditions such as the head direction and the left and right directions.

The ambient vibration detecting means 3a and the central vibration detecting means 4 may be arranged as shown in FIG. 4, similarly to the structure of this embodiment.

Next, a second embodiment of the present invention will be described. As shown in FIG. 5, a headboard is attached to the head of the bed 1, and the right side of the bed 1 is attached in contact with the wall. In such a bed 1, vibration detecting means 3b are arranged on two sides, the left side and the side part. The other structure is similar to that of the first embodiment and will not be described.

According to the above arrangement, in the case of this embodiment, when a person enters the bed, the left side of the bed 1 or the foot is limited. Therefore, in such a sleeping environment, the ambient vibration detecting means 3b shown in FIG. 4 reliably detects the vibration when entering the bed.

By the above operation, the ambient vibration detecting means 3b
The usage amount can be made short and appropriate, and the manufacturing cost and man-hours can be reduced. In addition to the necessary parts, the ambient vibration detecting means 3b
With this, there is an effect that there is no risk that an erroneous determination is made in the determination made by the determination means 8 when the noise signal is detected.

The ambient vibration detecting means 3b is shown in FIGS.
It can also be arranged as shown in FIG. With such an arrangement, the central vibration detecting means 4 can be omitted, so that the monitoring device can be realized with a simpler configuration.

Further, although the bed pad is used as the bedding this time, the vibration detecting means may be provided in a bedding, a bedding, a mattress, a bed sheet, or the like.

It should be noted that it is not always necessary to surround the entire circumference.
Even if it is arranged, it gives directionality that limits the bedding used.
And, it is possible to reduce manufacturing cost and man-hours in mass production.
In addition, it eliminates erroneous determination by detecting noise-like signals.
You can also do it.

[0023]

As is apparent from the above description, the monitoring device of the present invention has the following effects.

[0024] Since the bedding were provided with vibration detection means in the periphery thereof in any way, to reliably detect the vibration signal at the time-bed produced at that time be-bed from which site is a human, the signal
It is possible to reliably determine the-bed based on, the bed,
There is no erroneous determination in the absence determination.

[Brief description of drawings]

FIG. 1 is a block diagram of a monitoring device according to a first embodiment of the present invention.

FIG. 2 is a perspective view showing a vibration detecting means of the device.

FIG. 3 is a characteristic diagram illustrating signal processing of a vibration detection unit of the device.

FIG. 4 is a plan view when the central vibration detection means of the same device is provided in an annular shape.

FIG. 5 is a plan view of an ambient vibration detection unit of the same device and an L-shaped device.

FIG. 6 is a plan view of the same apparatus in which a central vibration detecting means and an ambient vibration detecting means are continuously provided.

FIG. 7 is a plan view in which the central vibration detecting means and the ambient vibration detecting means of the same device are continuous and the central part is provided so as to be X-shaped.

FIG. 8 is a plan view when the central vibration detection means and the ambient vibration detection means of the device are provided in a zigzag type.

FIG. 9 is a perspective view showing an arrangement state of vibration detection means of a conventional monitoring device.

FIG. 10 is a block diagram of the device.

FIG. 11 is a perspective view showing a multi-point arrangement state of vibration detection means of the same device.

FIG. 12 is a characteristic diagram illustrating signal processing of a vibration detecting unit of the same device.

[Explanation of symbols] 3a, 3b Ambient vibration detection means 4 Central vibration detection means 6 Signal conversion means 7 computing means 8 Judgment means

─────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-5-317291 (JP, A) JP-A-3-261456 (JP, A) (58) Fields investigated (Int.Cl. ⁷ , DB name) A61B 5/00

Claims (2)

(57) [Claims] 1. A linear or strip-shaped ambient vibration detecting means arranged around the bedding, a central vibration detecting means arranged in a central portion of the bed, and output signals of the ambient vibration detecting means and the central vibration detecting means. Signal converting means for converting the data into time series data, and dispersion of the time series data collected by the signal converting means
A calculating means for calculating a value , and the variance value calculated by the calculating means is compared with a threshold value provided in advance, and the bedding
A monitoring device having a determination means for determining the presence / absence of another person . 2. The monitoring device according to claim 1, wherein the linear or strip-shaped ambient vibration detecting means is provided around at least one side of the bedding.