JP2995801B2 - Floor monitoring device - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an in-bed monitoring device for simultaneously monitoring the in-bed state of a large number of people at a time. In nursing homes for the elderly, it is used for daily behavior management of patients and occupants, and in general households, it is used for family bedtime management, behavior management for elderly living alone, etc. is there.

2. Description of the Related Art Conventionally, an in-bed monitoring device of this type, for example, a plurality of beds provided with an infrared sensor or an ultrasonic sensor used in a security device, and an in-bed state based on output signals from each of the sensors described above. It is composed of a judging section for judging, and a monitor section for displaying the output signal of the judging section to monitor the state of each bed in bed intensively. According to the above configuration, the amount of change in infrared or ultrasonic waves generated by the movement of the human body existing on each bed is detected by the sensor, and the state of each bed is determined and displayed. In addition, there is also a configuration in which a pressure switch is disposed on the surface of a mattress of each bed, and the pressure switch is turned on according to the weight of the person to determine and display the occupied state.

Problems to be Solved by the Invention However, in the configuration of the on-bed monitoring device as described above, if no body motion occurs due to falling asleep, the infrared or ultrasonic wave does not change, so that it is determined that the device is not on-bed. A malfunction had occurred. In the configuration using the pressure switch, when heavy luggage or the like is left on the mattress when the apparatus is actually in the non-bed state, the switch is turned on and it is determined that the bed is in the bed state, and a malfunction occurs. As described above, the conventional occupancy monitoring apparatus has a problem that it is difficult to collectively monitor the occupancy status of a large number of people at the same time due to malfunction.

The present invention solves such a conventional problem, and by reliably determining the presence of the floor without the above-described malfunction,
It is an object of the present invention to provide a practical occupancy monitoring device capable of simultaneously monitoring the occupancy status of a large number of people collectively.

Means for Solving the Problems In order to solve the above problems, an on-bed monitoring device according to the present invention includes a flexible piezoelectric element that can be disposed on bedding such as a mattress, a futon, a sheet, and an output signal of the piezoelectric element. A filter circuit that allows only a predetermined frequency component to pass therethrough, an amplifier circuit that amplifies an output signal of the filter circuit, a rectifier circuit that rectifies an output signal of the amplifier circuit, and an output signal of the rectifier circuit that is output per unit time. An integrating circuit for integrating, a comparing circuit for performing output assuming that a human body is in a bed state on the bedding if an output signal from the integrating circuit is within a predetermined set range, the filter circuit, and the amplifying circuit A plurality of beds each including a bedding provided with the rectifying circuit, the integrating circuit, the comparing circuit, and the piezoelectric element, a communication unit, and the ratio through the communication unit. Display means for displaying the output signal of the comparison circuit on a display or the like.

Operation The present invention operates as follows by the above configuration.
That is, when the piezoelectric elements provided on each of the plurality of beds undergo deformation due to body movements such as heartbeat, respiration, and turning over of the bedding on the bedding, a voltage is generated from the piezoelectric elements by the piezoelectric effect. Then, only a predetermined frequency component of the generated voltage output is passed by the filter circuit, amplified by the amplifier circuit, rectified by the rectifier circuit, and then integrated per unit time by the integration circuit. If the output signal from the integration circuit is within a predetermined set range by the comparison circuit, the output is performed on the bedding assuming that the human body is in the bed. The output signal of the comparison circuit of each bed is collectively displayed on the display of the display means via the communication means.

Embodiments Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. This embodiment is composed of a plurality of beds, FIG. 1 is a perspective view showing a typical bed 12, and FIG. 2 is a block diagram of the embodiment. In FIG. 1 and FIG.
Reference numeral 1 denotes a flexible piezoelectric element, which is formed by forming a thin film of a polymer piezoelectric material such as polyvinylidene fluoride (PVDF) and attaching a flexible electrode film to both sides to form a tape. It can be mass-produced at a relatively low manufacturing cost. The piezoelectric element 1 is fixed to the surface of the mattress 11 by bonding or the like. Reference numeral 2 denotes a filter circuit that allows only a predetermined frequency component of the output signal of the piezoelectric element 9 to pass, and includes a Chebyshev circuit or the like. 3 is an amplifying circuit for amplifying the output signal of the filter circuit 2, 4 is a rectifying circuit for rectifying the output signal of the amplifying circuit 3, 5 is an integrating circuit for integrating the output signal of the rectifying circuit 4 per unit time, and 6 is an integrating circuit. If the output signal is within a predetermined setting range, a comparison circuit for performing output assuming that the human body is on the floor on the bedding, 7
Denotes a circuit unit including a filter circuit 2, an amplifier circuit 3, a rectifier circuit 4, an integration circuit 5, and a comparison circuit 6, reference numeral 8 denotes a communication cable, and reference numeral 9 denotes display means having a display 10.

In the above configuration, a mattress is provided for each bed.
When the piezoelectric element 1 disposed in 11 is deformed by body movement such as heartbeat, respiration, and turning over of the living body on the mattress,
A voltage is generated from the piezoelectric element 1 due to the piezoelectric effect. Then, only a predetermined frequency component of the generated voltage output is passed by the filter circuit 2, amplified by the amplifier circuit 3, rectified by the rectifier circuit 4, and integrated by the integration circuit 5 per unit time. Here, the band setting of the filter circuit is set to about 1 to about 10 Hz. FIGS. 3A and 3B show output signals of the amplifier circuit 3 in an actual situation, and FIG. 4 shows output signals of the integration circuit. FIG. 3b is an enlarged view of a portion S in FIG. 3a. In the figure, a portion T1 indicates a case where a human body exists on the bed, and a portion T2 indicates a case where the human body has left the bed and does not exist. As shown in the figure, there is a large output when rough body movements occur, such as when entering or leaving the bed or turning over, and when the body is at rest and in a resting state, the level is caused by minute body movements associated with the human heartbeat and respiration. And the output becomes zero when the user is out of bed. That is, as long as a human body is present in the bed at bedtime, a low-level output can be obtained at least due to minute body movements associated with the heartbeat, respiration, and the like of the human body. Utilizing this fact, the comparison circuit 6 outputs when the output signal of the integration circuit 5 is within the range of Va and Vb in FIG. Although minute body movements due to the heartbeat and respiration of the human body as described above vary among individuals, Va and Vb can be obtained by subject experiments and the like. The output signal from the comparison circuit 6 of each bed is displayed on the display 10 of the display means 9 via the communication means 8.

By the above-described operation, the state of the bed is monitored by detecting minute body movements caused by the heartbeat, respiration, etc. of the human body by the piezoelectric element 1 disposed on each bed, so that the conventional infrared sensor or ultrasonic wave is used. It is possible to surely and collectively monitor the state of occupancy of a large number of people without causing a malfunction such as in the occupancy monitoring device using a sensor. When a luggage or the like is placed on a mattress, the piezoelectric element is deformed and generates a voltage.However, an inanimate object such as luggage does not have minute movements associated with the heartbeat or respiration of the human body. Is determined to be absent. Therefore, there is no occurrence of a malfunction as in the conventional occupancy monitoring device using the pressure switch.

This makes it possible to reliably and practically manage daily behaviors of patients and occupants in a medical facility such as a hospital or a nursing home for the elderly, and manage bedtime of a family member at home. . In particular, it can manage wandering of dementia patients, drug addicts, sleepwalking patients, etc., and control bedtime of patients at the same time, so that more detailed treatment can be done and doctors and nurses who perform management actions can do it. This has the effect of reducing the amount of labor.

In the above embodiment, each of the comparison circuits 6 and the display unit 9 are connected by the communication cable 8. However, as a second embodiment of the present invention, the circuit unit 7 has a transmission unit, and the display unit 9 has a reception unit. The configuration may be such that each of the comparison circuits 6 and the display means 9 can communicate with each other wirelessly, so that there is no need to lay a communication cable and the bed can be moved freely when the bed is moved. .

Further, as a third embodiment of the present invention, the circuit unit 7 and the display means 9 may each have a modem so as to transmit the output signal of each comparison circuit 6 to the display means 9 via a telephone line. It can be utilized as a home medical system, such as checking the state of bed of an elderly person living alone in Japan.

As a fourth embodiment of the present invention, the display means 9 may have a storage unit for storing the output signal of each comparison circuit 6 and display the storage data of the storage unit. There is an effect that behavior management can be performed by using time-series data from the present to the present, and it can be utilized for diagnosis and treatment of wandering patients.

As a fifth embodiment of the present invention, the display means 9 may be configured to include an alarm generation unit that generates an alarm when the output signal of each comparison circuit 6 has not been present for a predetermined time or more. It is possible to respond promptly in the event of an emergency such as when the person wanders or falls into a sudden illness outside the bed and cannot return to the bed.

In the above embodiments, the piezoelectric element is provided on the mattress of each bed. However, a piezoelectric element may be provided on a bed, a sheet, or the like so as to be compatible with a Japanese-style sleeping style.

Effects of the Invention As described above, the following effects can be obtained by the on-bed monitoring device of the present invention.

In other words, it is possible to collectively monitor the state of occupancy of a large number of people at once and reliably monitor without malfunction, so that patients and occupants in medical facilities such as hospitals and nursing homes for the elderly, etc. Bed management of family members can be realized in a practical form, and more detailed treatments and services than before can be provided. Further, there is an effect that the amount of labor of doctors, nurses, family members, helpers, and the like who perform the management action can be reduced.

[Brief description of the drawings]

1 is a perspective view of a bed of an on-bed monitoring device according to an embodiment of the present invention, FIG. 2 is a block diagram of the device, FIG. 3a is a waveform diagram showing an output from an amplifier circuit of the device, FIG. FIG. 3B is an enlarged waveform diagram of FIG. 3A, and FIG. 4 is a waveform diagram showing an output from the integration circuit of the device. DESCRIPTION OF SYMBOLS 1 ... Piezoelectric element, 2 ... Filter circuit, 3 ... Amplification circuit, 4 ... Rectification circuit, 5 ... Integration circuit, 6 ... Comparison circuit, 7 ... Circuit unit, 8 ... Communication cable, 9 ... ... display means, 10 ... display, 11 ... mattress, 12 ... bed.

Claims (5)

(57) [Claims] 1. A flexible piezoelectric element disposed on a bedding such as a mattress, a futon, a sheet, etc., a filter circuit for passing only a predetermined frequency component of an output signal of the piezoelectric element, and the filter circuit An amplifier circuit for amplifying the output signal of the amplifier circuit, a rectifier circuit for rectifying the output signal of the amplifier circuit, an integration circuit for integrating the output signal of the rectifier circuit per unit time, and an output signal from the integration circuit are predetermined. If the set range is within a predetermined range, a comparison circuit for performing output on the bedding assuming that the human body is in a bed state, and the filter circuit, the amplification circuit, the rectification circuit, the integration circuit, the comparison circuit, and the piezoelectric element are arranged. An on-bed monitor device comprising: a plurality of beds each including a set of bedding; and display means for displaying an output signal of the comparison circuit via communication means. 2. The occupancy monitoring device according to claim 1, wherein the communication means wirelessly transmits the output signal of the comparison circuit to the display means. 3. The on-bed monitoring device according to claim 1, wherein the communication means transmits the output signal of the comparison circuit to the display means via a telephone line. 4. The on-bed monitoring device according to claim 1, wherein the display means has a storage unit for storing an output signal of the comparison circuit, and displays data stored in the storage unit. 5. The occupancy monitoring device according to claim 1, wherein the display means has an alarm generation section for generating an alarm when an output signal of the comparison circuit has not been present for a predetermined time or more. .