WO2017061590A1 - External load detector for bed, and bed - Google Patents

Abstract

This load detector 10 is provided with a pair of fixing units 12, 14 fixed to a member (a transverse pipe 8a of a case, or an actuator pipe) of an electric bed which is deformed by a movement of a patient, a load cell 16 that detects a change in a load applied between the fixing portions 12, 14, and, as necessary, a fixture, and makes it possible to acquire biological information concerning the movement, breathing, heartbeat, and weight of the patient on the basis of the change in the load. Thus, the load detector can be externally attached to an existing bed easily.

Description

Bed external load detector and bed

The present invention relates to an external load detector for a bed, and in particular, in a patient bed or a bed for a healthy person (hereinafter collectively referred to as a bed) in a hospital or a care facility such as a care bed, an electric bed or a care lift. , Suitable for use when measuring the load and obtaining biological information such as weight, vibration and breathing, heartbeat, body weight, etc. The present invention relates to an external load detector for a bed that can be easily installed later on an inner bed.
This application is based on Japanese Patent Application No. 2015-199882 filed in Japan on October 8, 2015 and Japanese Patent Application No. 2016-198160 filed in Japan on October 6, 2016. All claims are incorporated herein by reference in their entirety for all purposes.

In recent years, there has been a social problem, such as falling and falling accidents around the bed and elderly people with dementia, and countermeasures are required. In addition, by monitoring the movement of a user who has been in the bed for a long period of time, such as an elderly person or a patient who has just been postoperatively, using bed load information, it is possible to more quickly in the event of an abnormal situation. It is expected to be able to respond appropriately.

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

JP-A-2-280733 Japanese Patent No. 3093745 Japanese Patent No. 3322632 Japanese Patent No. 4818162 Japanese Patent No. 4551417 Japanese Patent No. 4857156

On the other hand, recently, 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 bed lifting / lowering actuator, but conventionally there has not been a load detector that can be easily externally attached to an existing bed.

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

The present invention is an external load detector for a bed, and includes a pair of fixing portions fixed to a bed member that is deformed by the movement of a patient, and a load cell that detects a change in load applied between the fixing portions. Based on the change in the load, it is possible to acquire biological information related to the patient's movement, breathing, heartbeat, and weight, thereby solving the above problem.

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

Further, the member of the bed that is deformed by the movement of the patient can be a pipe constituting a part of the casing of the bed or a rod pipe of an actuator for driving the bed frame.

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

The perspective view which looked at the whole structure of the electric bed in 1st Embodiment from diagonally upward. The perspective view seen from diagonally downward in 1st Embodiment. The expansion perspective view which shows the attachment state to the electric bed of 1st Embodiment. The expansion perspective view which shows the state which attached 1st Embodiment to the 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 a process with the software of 1st Embodiment. The block diagram which shows the structural example of the abnormality detection circuit using 1st Embodiment. The (A) top view which shows the structure of 2nd Embodiment, (B) Front view and (C) Side view. The perspective view which shows the principal part structure of the electric bed in 2nd Embodiment. The expansion perspective view of the important section composition of the electric bed in a 2nd embodiment. The flowchart which shows the process by the software in embodiment mentioned above. 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. In addition, this invention is not limited by the content described in the following embodiment and an Example. In addition, the constituent elements 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, and those in the so-called equivalent range. Furthermore, the constituent elements disclosed in the embodiments and examples described below may be appropriately combined or may be appropriately selected and used.

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, as shown in FIGS.

The casing of the electric bed 1 is provided with several cylindrical pipes (referred to as horizontal pipes) 8a, 8b, 8c, 8d in the horizontal direction.

The electric bed 1 is configured such that a 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 (refer to FIG. 2) that constitutes an actuator rod. Thus, the height of the bed can be adjusted.

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

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

The load detector 10 is shown in FIG. 3 (an enlarged perspective view showing a state of being attached to an electric bed), FIG. 4 (an enlarged perspective view showing a state of being attached to a pipe), and FIG. 5 (a perspective view showing a configuration of the load detector). As shown in detail in the figure, 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 load applied between the fixing portions 12 and 14 are provided. Yes. 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.

Thereby, it is possible to detect that the load detector 10 mounting portion (the horizontal pipe 8a) of the bed casing is distorted. From this, it is possible to detect the load applied to the portion and the change thereof and Vibration (waves) transmitted can be detected, and biological information including respiration, heartbeat, and weight can be detected. Therefore, just by sleeping on the electric bed 1, it is possible to detect the breathing and heartbeat of the sleeping person in a non-contact manner.

That is, since the vibration of the breathing and heartbeat of the sleeping person is transmitted to the casing of the electric bed 1, by detecting the vibration (wave) with the load detector 10, FIG. 6 (raw waveform) And as illustrated in FIG. 7 (waveform after processing by software), it is possible to detect a large wave as a breath and a peak protruding in the breathing wave as a heartbeat. In FIG. 7, the measurement data is easy to see by including a respiration rate and a vertex 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 a determination condition such as a threshold is set from a 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 to the display alarm unit 34 to display or warn the supervisor. .

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

The load detector 40 according to the second embodiment is shown in FIG. 3 and FIG. 10 (a perspective view showing the configuration of the main part of the 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 detectors 10 and / or 40 are attached to an existing bed, and the biological information related to the patient's movement, breathing, heart rate, and weight can be acquired by the signal.

In the above-described embodiment, the present invention is applied to an electric bed. However, the application target of the present invention is not limited to this, and a nursing bed and a care lift that are not motorized, and a bed for a healthy person It is also applicable to. Further, the load detectors 10 and 40 are not limited to the horizontal pipe 8a and the actuator pipe 9 below the patient. The horizontal pipes 8b, 8c and 8d and the vertical pipes of the other parts shown in FIGS. It can be attached to any part where vibrations due to patient movement, breathing, and heartbeat are transmitted.

Further, a process for 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 a 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 noise removal processing, for example, noise removal may be performed using an HPF / LPF or a gain adjustment circuit, or processing such as fast Fourier transform may be performed on the amplified signal to remove noise components. good.

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

Thus, in order to discriminate and extract the biological information from the load detector, it may be realized by hardware or software.

In the above-described embodiment, the load detector 10 is described as being provided in the central portion of the horizontal pipe 8a. However, other portions may be used as long as the vibration of the bed can be detected, that is, the portion is distorted. .

For example, you may provide in the position of the edge part of the horizontal pipe 8a, and you may provide in the position like the member 11 of a figure. This position may be determined by calculating and determining a position where distortion is likely to occur, for example, from the 3D-CAD data of the bed apparatus, or by actually providing a value by installing the load detector 10. The position may be determined.

As a third embodiment, a plurality of load detectors 10 may be provided. For example, the load detector 10 is provided at a position where strain in the X direction, Y direction, and Z direction can be detected as the strain direction in the electric bed 1. And it is good also as detecting the distortion of each direction from a load detector, and acquiring biometric information.

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

For example, it is assumed that the load detector 10a is provided in the center of the horizontal pipe 8a and the load detectors 10b and 10c are provided on the left and right of the horizontal pipe 8b. And it becomes possible to obtain | require the gravity center on the electric bed 1 from the load detected by each load detector 10a, 10b, 10c.

Thereby, for example, the presence / absence state of the patient can be detected, and further, the position of the patient can be detected from the center of gravity of the load. Further, by detecting the loads related to the load detectors 10a, 10b, and 10c, the patient's state (for example, the supine position or the end-sitting position) can be determined.

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

For example, the load detector 10 is provided with wireless communication means (for example, Bluetooth (registered trademark), ZigBee (registered trademark), wireless USB, etc.). And the detected load signal is transmitted to a management server, or is transmitted to portable terminal devices, such as a smart phone.

By transmitting the load signal to the management server, the management server side can acquire and manage the patient status and biological information in a lump. Moreover, it becomes possible to grasp | ascertain a patient's state easily by transmitting a load signal to a portable terminal device.

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 a family. By doing so, it is possible to easily grasp the patient's bed leaving / being present or to grasp the patient's condition with the portable terminal device.

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

For example, when a strain sensor is provided in the actuator, not all of the load is transmitted to the strain sensor due to the influence of components in the actuator. In addition, since the entire force is not 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 it is susceptible to noise. In particular, when the actuator is operating, a large noise is added and the reliability is lowered.

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

On the other hand, in the load detector of the present embodiment, by knowing the structure of the bed apparatus in advance, a place where a load is applied to each bed apparatus can be obtained, and the load detector can be provided at the place. Further, by providing a plurality of places, it is possible to acquire loads in a plurality of directions, and it is also possible to acquire uneven loads. Thereby, highly reliable data can be acquired.

Although the bed apparatus has been described as an example of providing the load detector, for example, other apparatuses such as wheelchairs can be expected to have the same effect by being provided at a position where distortion occurs.

In this way, the amount of deformation and the amount of distortion are detected at locations where deformation occurs due to patient movement and where distortion occurs. Then, the load can be detected from the detected deformation amount or the like. Biological information can be acquired based on the detected load or a change in the load.

DESCRIPTION OF SYMBOLS 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 ... Fixing tool 30 ... Controller 31 ... Bolt

Claims (7)

1. A pair of fixed portions fixed to a member of the bed that is deformed by the movement of the patient;
   A load cell for detecting a load applied between the fixed parts,
   A bed external load detector characterized in that biometric information can be acquired based on a change in the load.
2. The bed external load detector according to claim 1, wherein the biological information is at least one of a patient's movement, respiration, heart rate, and weight.
3. The bed external load detector according to claim 1 or 2, further comprising a pair of fixtures for fixing the pair of fixing portions to a bed member.
4. The bed external load detector according to any one of claims 1 to 3, wherein the bed member deformed by the movement of the patient is a pipe constituting a part of the casing of the bed. .
5. The bed external load detection according to any one of claims 1 to 3, wherein the bed member deformed by the movement of the patient is a rod pipe of an actuator for driving a frame of the bed. vessel.
6. A bed comprising the bed external load detector according to any one of claims 1 to 5.
7. A load detector having a pair of fixed portions fixed to a member of the bed that is deformed by the movement of the patient, and a load cell that detects a load applied between the fixed portions;
   The load detector is provided in at least three locations of the bed member deformed by the patient, and a center-of-gravity determination unit that determines the center of gravity of the load related to the bed;
   A patient determination unit for determining the position or state of the patient on the bed by the center of gravity determination unit;
   A bed characterized by comprising:

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