JP6757642B2 - Bed system - Google Patents

Description

The present invention relates to an external load detector for a bed, and particularly in a patient's device of a hospital or a care facility such as a care bed, an electric bed or a care lift, or a bed for a healthy person (hereinafter, collectively referred to as a bed). , Suitable for measuring the load and obtaining biological information such as weight, vibration and breathing, heartbeat, weight, etc., the load at the required part of the bed can be easily measured, and it can be used in addition to when manufacturing the bed. The present invention relates to an external load detector for a bed that can be easily installed on the bed inside.

In recent years, wandering of elderly people with dementia and accidents of falls or falls around the bed have become social problems, and countermeasures are required. In addition, by monitoring the movement of users who have been in bed for a long period of time, such as the elderly and patients who have just undergone surgery, on the bed load information, it is possible to make it faster in the event of an abnormal situation. It is expected that we will be able to respond.

For this purpose, for example, in Patent Documents 1 to 3, a load detector is provided on the leg of the bed or between the leg and the floor to directly measure the load, or a torque for indirectly measuring the load on the elevating mechanism of the floor. It is stated that a sensor is provided. Further, Patent Documents 4 and 5 describe that a load detector is provided on a bed frame.

Japanese Unexamined Patent Publication No. 2-280733 Japanese Patent No. 3093745 Japanese Patent No. 3322632 Japanese Patent No. 4818162 Japanese Patent No. 4514717 Japanese Patent No. 4857156

On the other hand, in recent years, as described in Patent Document 6, an electric bed capable of electrically moving the back portion of the bed has been put into practical use. In such an electric bed, it is conceivable to attach a load detector to the actuator for raising and lowering the bed, but conventionally, there has been no load detector that can be easily externally attached to the existing bed.

The present invention has been made to solve the above-mentioned conventional problems, and an object of the present invention is to provide an external load detector for a bed that can be easily externally attached to an existing bed.

The present invention is an external load detector for a bed, which includes a pair of fixing portions fixed to a member of the bed that is deformed by the movement of a patient, and a load cell that detects a change in the load applied between the fixing portions. The problem is solved by making it possible to acquire biological information on the movement, respiration, heartbeat, and weight of the patient based on the change in the load.

Here, each pair of fixtures for fixing the pair of fixing portions to the bed member can be further provided.

Further, the bed member deformed by the movement of the patient can be a pipe forming a part of the bed housing or a rod pipe of an actuator for driving the bed frame.

According to the present invention, a pair of fixing portions are fixed to a bed member (for example, a pipe forming a part of a bed housing or an actuator rod pipe for driving a bed frame) that is deformed by the movement of a patient. Since the load cell detects the change in the load applied between the fixed parts, the load cell can be easily externally attached to the existing bed, and the movement and breathing of the patient based on the change in the load. Biological information on heartbeat and weight can be easily obtained.

A perspective view of the entire configuration of the electric bed according to the first embodiment as viewed from diagonally above. The perspective view seen from diagonally below in 1st Embodiment. The enlarged perspective view which shows the mounting state to the electric bed of 1st Embodiment. An enlarged perspective view showing a state in which the first embodiment is attached to a horizontal pipe. The perspective view which shows the structure of 1st Embodiment. The diagram which shows the measurement screen of 1st Embodiment. The diagram which shows the waveform after processing by the software of 1st Embodiment. The block diagram which shows the structural example of the abnormality detection circuit using 1st Embodiment. (A) plan view, (B) front view and (C) side view showing the configuration of the second embodiment. The perspective view which shows the main part structure of the electric bed in 2nd Embodiment. The enlarged perspective view of the main part composition of the electric bed in 2nd Embodiment. The flow diagram which shows the processing by software in the said embodiment. The figure for demonstrating the structure in 4th Embodiment.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. The present invention is not limited to the contents described in the following embodiments and examples. Further, the constituent requirements in the embodiments and examples described below include those that can be easily assumed by those skilled in the art, those that are substantially the same, that is, those in a so-called equal range. Further, the components disclosed in the embodiments and examples described below may be appropriately combined or appropriately selected and used.

As shown in FIGS. 1 and 2, the electric bed attached in the present embodiment mainly includes a back bottom 2, a waist bottom 4, a knee bottom 5, and a foot bottom 7.

Further, the housing of the electric bed 1 is provided with several pipes (referred to as horizontal pipes) 8a, 8b, 8c, and 8d which are cylindrical in the lateral direction.

In the electric bed 1, the frame 3 that supports the back bottom 2 and the like moves up and down by the movement of a pipe (referred to as an actuator pipe) 9 (see FIG. 2) that constitutes an actuator rod. Allows the height of the bed to be adjusted.

Below the back bottom 2, the waist bottom 4, the knee bottom 5, and the foot bottom 7, a back raising device for raising the back bottom 2 (not shown) and a knee raising device for raising the knee bottom 5 (not shown). Omitted) is installed.

An external load detector (hereinafter, simply referred to as a load detector) 10 according to the first embodiment is attached to a horizontal pipe 8a below the patient, which constitutes a part of the housing of the electric bed 1. ..

The load detector 10 has FIG. 3 (enlarged perspective view showing a state of being attached to an electric bed), FIG. 4 (enlarged perspective view showing a state of being attached to a pipe), and FIG. 5 (a perspective view showing a configuration of a load detector). As shown in detail in FIG.), a pair of fixing portions 12 and 14 fixed to the surface of the horizontal pipe 8a and a load cell 16 for detecting a change in the load applied between the fixing portions 12 and 14 are provided. There is. In the figure, the wiring 18 is a wiring connected to the load cell 16 from the outside.

The fixing portions 12 and 14 are fixed to the horizontal pipe 8a using, for example, an epoxy adhesive.

As a result, it is possible to detect that the load detector 10 mounting portion (horizontal pipe 8a) of the bed housing is distorted, and from this, the load applied to the portion and its change are detected, and the housing of the electric bed 1 is fitted. It is possible to detect the transmitted vibration (wave) and detect biological information including respiration, heartbeat, and body weight. Therefore, it is possible to detect the respiration and heartbeat of a sleeping person without contact by simply sleeping on the electric bed 1.

That is, since the vibrations of the sleeping person's breathing and heartbeat are transmitted to the housing of the electric bed 1, the vibrations (waves) are detected by the load detector 10 in FIG. 6 (raw waveform). And, as illustrated in FIG. 7 (waveform processed by software), it is possible to detect a large wave as a respiration and a peak protruding in the respiration wave as a heartbeat. In FIG. 7, the measured data is easy to see by including the respiratory rate and the apex detection function.

FIG. 8 shows a configuration example of an abnormality detection circuit using the load detector 10. A controller 30 is provided inside or outside the electric bed 1, and determination conditions such as a threshold value are set by the determination condition setting unit 32. Then, the controller 30 senses the output of the load detector 10, and when the determination condition is satisfied (for example, when the threshold value is exceeded), the controller 30 can output the output to the display alarm unit 34 to display or give an alarm to the observer. ..

In the present embodiment, since the load detector 10 is attached to the horizontal pipe 8a constituting the housing of the electric bed 1, vibration is likely to occur.

In the load detector 10 according to the first embodiment, the fixing portions 12 and 14 are fixed to the horizontal pipe 8a by adhesion, but the fixing portions 12 and 14 can be attached or fixed to the attachment object. Is not limited to this, and as in the load detector 40 according to the second embodiment shown in FIG. 9, for example, a bolt 31 is used by using a pair of C-shaped fixtures 20, 22 and 24, 26, respectively. It is also possible to fix the load detector 40 to the mounting target by sandwiching the mounting target (actuator pipe 9 in this case) and the fixing portions 12 and 14 by the screwing.

The load detector 40 according to the second embodiment is shown in FIG. 3 and FIG. 10 (a perspective view showing a main configuration of an electric bed to which the second embodiment is attached) and FIG. 11 (also an enlarged perspective view). As shown in FIG. 2, it can be attached to the actuator pipe 9 shown in FIG.

In this way, it is possible to detect that the actuator pipe 9 in the sandwiched portion is distorted.

As described above, the load detector 10 and / or 40 can be attached to the existing bed, and the signal can be used to acquire biological information on the patient's movement, respiration, heart rate, and weight.

In the above embodiment, the present invention has been applied to an electric bed, but the application of the present invention is not limited to this, and a non-electrified nursing bed, a nursing lift, and a bed for a healthy person are used. It is also applicable to. Further, the attachment target of the load detectors 10 and 40 is not limited to the horizontal pipe 8a and the actuator pipe 9 below the patient, and the horizontal pipes 8b, 8c, 8d and the vertical pipes of other parts shown in FIGS. 1 and 2 are attached. It can be attached to any part where the patient's movement, breathing, and vibration due to heartbeat are transmitted.

Further, a process of extracting a biological signal from a signal (sensor signal) detected from the load detector 10 and / or 40 will be described with reference to FIG.

First, when the sensor signal is input (step S102), the signal is amplified (step S104). For example, a differential amplifier may be used as hardware, or amplification processing may be executed as software.

Next, noise removal processing is executed from the amplified signal (step S106). As the noise removal processing, for example, noise may be removed by an HPF / LPF or a gain adjustment circuit, or a processing such as a fast Fourier transform may be executed on the amplified signal to remove the noise component. good.

Subsequently, it is converted into a digital signal by A / D conversion processing (step S108), and the biological signal is taken out by using the biological signal filter (step S110) (step S112).

In this way, in order to discriminate and retrieve biometric information from the load detector, it may be realized by hardware or software.

Further, in the above-described embodiment, the load detector 10 is provided in the central portion of the horizontal pipe 8a, but other locations may be used as long as the vibration of the bed can be detected, that is, the location where distortion occurs. ..

For example, it may be provided at a position at the end of the horizontal pipe 8a, or may be provided at a position like the member 11 in FIG. This position may be determined by calculating, for example, a position where distortion is likely to occur from the 3D-CAD data of the bed device, or it is preferable to actually provide the load detector 10 and acquire the value. The position may be determined.

As the third embodiment, a plurality of load detectors 10 may be provided. For example, the load detector 10 is provided at a position where the strain in the X direction, the Y direction, and the Z direction can be detected as the strain direction in the electric bed 1. Then, the strain in each direction may be detected from the load detector to acquire biometric information.

In the fourth embodiment, the position of the patient and the presence of the patient in bed may be detected by providing a plurality of load detectors 10 in the electric bed 1. For example, FIG. 13 is a diagram for schematically explaining the electric bed 1. Load detectors 10a, 10b, and 10c will be provided at three locations on the electric bed 1.

For example, it is assumed that a load detector 10a is provided in the center of the horizontal pipe 8a, and load detectors 10b and 10c are provided on the left and right sides of the horizontal pipe 8b. Then, the center of gravity on the electric bed 1 can be obtained from the loads detected by the load detectors 10a, 10b, and 10c.

Thereby, for example, the state of being in bed / leaving the bed of the patient can be detected, and the position of the patient can be detected from the center of gravity of the load. Further, by detecting the load related to the load detectors 10a, 10b, and 10c, the state of the patient (for example, the supine position, the sitting position, etc.) can be determined.

Subsequently, the fifth embodiment will be described. The load detector 10 described above has been described as connecting the load signal detected by the wiring 18 to an external device (for example, the controller 30), but in the fifth embodiment, for example, a communication means is further provided. The form will be described.

For example, the load detector 10 is provided with wireless communication means (for example, Bluetooth (registered trademark), ZigBee (registered trademark), wireless USB, etc.). Then, the detected load signal is transmitted to the management server or a mobile terminal device such as a smartphone.

By transmitting the load signal to the management server, the management server side can collectively acquire and manage the patient's condition and biological information. Further, by transmitting the load signal to the mobile terminal device, it becomes possible to easily grasp the state of the patient.

For example, when the electric bed 1 is used at home, an application capable of communicating with the load detector 10 is installed in a mobile terminal device such as a smartphone used by the family. By doing so, the mobile terminal device can easily grasp the patient's getting out of bed / being in bed and grasping the patient's condition.

As described above, in the load detector described in the above-described embodiment, the load detector can be easily attached to the bed device such as the electric bed later. Further, by providing a load detector at a place where distortion occurs, it is possible to perform load detection with higher accuracy than the conventional load sensor.

For example, when the strain sensor is provided in the actuator, all the load is not transmitted to the strain sensor due to the influence of the parts in the actuator. Further, since not all the forces are transmitted in the axial direction of the actuator, the load resolution is lowered.

In addition, since there are many inclusions up to the actuator, there is a problem that the actuator is easily affected by noise. In particular, when the actuator is operating, a large amount of noise is added, which reduces reliability.

The method of incorporating the load cell in the bed device is highly reliable, but the cost is high and it is difficult to retrofit the bed device currently installed.

On the other hand, in the load detector of the present embodiment, by grasping the structure of the bed device in advance, a place where a load is applied can be obtained for each bed device, and a load detector can be provided at the place. Further, by providing a plurality of locations, it is possible to acquire a load in a plurality of directions, and it is possible to acquire an eccentric load. As a result, highly reliable data can be acquired.

Although the bed device has been described as an example of providing the load detector, the same effect can be expected by providing the load detector at a position where distortion occurs in other devices such as a wheelchair.

In this way, the amount of deformation and the amount of distortion at the portion deformed by the movement of the patient and the portion where the strain occurs are detected. Then, the load can be detected from the detected deformation amount and the like. Biometric information can be acquired based on this detected load or change in load.

1 ... Electric bed 2 ... Back bottom 3 ... Frame 4 ... Waist bottom 5 ... Knee bottom 7 ... Foot bottom 8a, 8b, 8c, 8d ... Horizontal pipe 9 ... Actuator pipe 10, 40 ... Load detector 12, 14 ... Fixed part 16 ... Load cell 20, 22, 24, 26 ... Fixture 30 ... Controller 31 ... Bolt

Claims (5)

A bed consisting of a housing with horizontal pipes in the width direction,
A load detector having a pair of fixing portions attached to the surface of the horizontal pipe and a load cell for detecting a change in the load applied between the pair of fixing portions.
A controller that acquires biometric information based on the change in the load detected by the load detector, and
The bed system is characterized by being equipped with. The bed system according to claim 1, wherein the fixing portion is attached near the center of the horizontal pipe. Bed and
An actuator for driving the bed frame and
A load detector having a pair of fixing portions attached so as to sandwich the pipe of the actuator and a load cell for detecting a change in the load applied between the pair of fixing portions.
A controller that acquires biometric information based on the change in the load detected by the load detector, and
The bed system is characterized by being equipped with. The bed system according to any one of claims 1 to 3, wherein the controller acquires at least one of the movement, respiration, and heartbeat of the patient as biological information based on the change in the load. The bed system according to claim 1 or 2, wherein the fixing portion is fixed to the surface of the horizontal pipe using an epoxy adhesive.