JP2020185318A - mattress - Google Patents

Abstract

To provide a care bed that can prevent occurrence of bedsores, and is easy to use.SOLUTION: A mattress 11 comprises a plurality of movable parts 12 capable of being displaced in a thickness direction, a driving part 13 for displacing the respective movable parts, a sensor part 14 for detecting pressure acting on the respective movable parts, and a control unit 20 for executing bedsore prevention processing (S12) for controlling the driving part so that a height dimension of a predetermined movable part out of the respective movable parts is different from a height dimension of the other movable parts on the basis of the pressure detected by the sensor part.SELECTED DRAWING: Figure 1

Description

The present invention relates to a mattress.

In hospitals, long-term care facilities, or homes, so-called bedridden users use long-term care beds, but if they remain in the same posture for a long period of time, blood flow in areas compressed by weight deteriorates, causing bedsores. (Decubitus) occurs. Therefore, a technique has been proposed in which the mattress is divided into a plurality of cells and the setting thereof is variably controlled to prevent the occurrence of bedsores (Patent Documents 1 to 6).

JP-A-2016-127982 Japanese Unexamined Patent Publication No. 2019-633346 Japanese Unexamined Patent Publication No. 62-183762 Japanese Unexamined Patent Publication No. 2013-70912 Japanese Unexamined Patent Publication No. 2014-64618 JP-A-2017-51549

In the prior art, it is possible to prevent the user's body and the mattress from continuously contacting the same place for a long time, but there is room for improvement in the method of adjusting the height of the contact part and the method of setting the contact part.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a care bed that can prevent the occurrence of pressure ulcers and is easy to use.

In order to solve the above problems, a mattress according to one aspect of the present invention includes a plurality of movable parts that can be displaced in the thickness direction, a drive part that displaces each movable part, and a sensor that detects the pressure acting on each movable part. Pressure ulcer prevention treatment that controls the drive unit so that the height dimension of a predetermined movable portion of each movable portion and the height dimension of the other movable portion are different based on the pressure detected by the unit and the sensor unit. It is provided with a control unit that executes the above.

The control unit can control the drive unit so that the height dimension of the predetermined movable portion is smaller than the height dimension of the other movable portion located around the predetermined movable portion.

The predetermined movable portion may be set corresponding to a predetermined location of the user.

The control unit can control the drive unit so that the contact area between the predetermined location and the predetermined movable portion becomes small.

The predetermined location may be a location where the occurrence of pressure ulcer is predicted.

Further, a selection unit for selecting a predetermined movable portion from each movable portion may be provided.

The selection unit can manually select a predetermined movable unit by the operator's operation on the screen displaying the relationship between each movable unit and the user.

The selection unit may automatically select a predetermined movable unit by comparing the pressure detected by the sensor unit with a predetermined pressure set in advance.

In addition to the pressure ulcer prevention treatment, the control unit can also perform a blood circulation promoting treatment that promotes the blood circulation of the user, and the blood circulation promoting treatment periodically changes the height dimension of other moving parts. It may be a treatment that promotes blood circulation of the user.

In the blood circulation promoting treatment, among the other movable parts in the predetermined area, the height dimension of the other movable parts is adjusted so that the movable parts on which the pressure exerted by the user acts are dispersed in the predetermined area over time. It may be controlled.

In addition to the pressure ulcer prevention process, the control unit can also perform a position change process that changes the position of the user, and the position change process is the height of the movable part arranged at a predetermined position among the movable parts. By setting the dimension larger than the normal height dimension, the posture of the user can be changed.

The control unit compares the number of movable parts that come into contact with the user and the number of movable parts that do not contact the user among other movable parts before and after the change of the user's body position, and compares the two. It is also possible to issue an alarm to the operator when is different by a predetermined value or more.

The area of each movable portion may be different between the peripheral portion and the central portion of the mattress portion.

According to the present invention, the occurrence of pressure ulcers can be prevented by controlling the drive unit so that the height dimension of the predetermined movable portion and the height dimension of the other movable portion are different.

It is the whole block diagram of the care bed equipped with a mattress. It is explanatory drawing which shows the place where a pressure ulcer is likely to occur. It is explanatory drawing which shows the operation of the cell as a movable part. It is a flowchart which shows the control process of a care bed. It is explanatory drawing which shows the screen example of the terminal operated by an operator. It is a flowchart which shows the pressure ulcer prevention process. It is a flowchart which shows the blood circulation promotion process. It is explanatory drawing which shows the pattern change which adjusts the height dimension of a movable part. It is a flowchart which shows the posture change process. It is a flowchart which shows the alarm processing. It is an example of a mattress having a different size of a movable part according to the second embodiment. FIG. 5 is an overall configuration diagram showing an example in which a plurality of nursing care beds and a plurality of operator terminals are connected by a communication network according to the third embodiment.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the present embodiment, as described below, by controlling the height dimensions of a plurality of moving parts of the mattress, it is possible to prevent pressure ulcers from occurring in the mattress user (for example, a patient or an elderly person). .. Further, in the present embodiment, a comfortable environment is provided to the user by not only preventing the occurrence of pressure ulcers but also promoting blood circulation and / or repositioning. In the present embodiment, the case where the mattress 11 is used for the nursing bed 1 will be described as an example, but the present invention is not limited to this, and the mattress 11 can be used alone.

The first embodiment will be described with reference to FIGS. 1 to 10. FIG. 1 shows the overall configuration of the nursing bed 1. The nursing bed 1 includes, for example, a bed body 10, a mattress 11 having a plurality of cells 12, an actuator 13, a pressure sensor 14, a controller 20, and a terminal 30.

The bed body 10 is provided, for example, on the frame, a floor plate provided on the frame and movable at a predetermined position, legs supporting the frame, a footboard provided on the foot side of the frame, and a head side of the frame. It includes a headboard and side rails (both not shown) that partially cover the sides of the frame. The posture change actuator 15 can change the posture of the floor plate to the left or right, for example. Here, the left and right are the left and right as seen from the user 40 lying on the nursing bed 1. In the following, the user 40 may be abbreviated as "user".

A mattress 11 is provided on the floor plate of the bed body 10. The mattress 11 has a plurality of cells 12. The cell 12 as the "movable part" can be displaced in the thickness direction of the mattress 11 (the direction perpendicular to the paper surface of FIG. 1, also referred to as the vertical direction).

In this embodiment, a case where cells 12 having the same shape are continuously arranged vertically and horizontally on the mattress 11 will be described, but it is not necessary for each cell 12 to have the same shape, and some cells 12 need to have the same shape as in the examples described later. The shape of the cell 12 may be different. Alternatively, a displaceable cell 12 may be provided in a part of the mattress 11 and the other area may be non-displaceable.

The actuator 13 as the "drive unit" displaces the cell 12 in the thickness direction (vertical direction) by a predetermined amount according to a control signal from the controller 20. The actuator 13 displaces the cell 12 by using energy such as pneumatic pressure, water pressure, oil pressure, electromagnetic force, and heat. That is, the actuator 13 displaces the cell 12 by using, for example, a pneumatic cylinder, a hydraulic cylinder, a hydraulic cylinder, an electromagnetic solenoid, a shape memory alloy, or the like.

The pressure sensor 14 as a "sensor unit" detects the pressure of each cell 12 and transmits a detection signal to the controller 20. That is, the pressure sensor 14 detects the body pressure when the user's body comes into contact with the cell 12 as an electric signal and sends it to the controller 20.

The controller 20 as a "control unit" controls the operation of the nursing bed 1. The controller 20 includes, for example, a microprocessor (CPU in the figure) 21, a memory 22, a storage device 23, a communication unit 24, and an input / output unit 25.

The microprocessor 21 realizes the functions of the mattress 11 (decubitus prevention function, blood circulation promotion function, position change function) by reading the computer programs S12, S14, and S16 stored in the storage device 23 into the memory 22 and executing them. ..

The storage device 23 stores the above-mentioned computer programs (decubitus prevention treatment S12, blood circulation promotion treatment S14, position change processing S16) and the pressure value detected by each pressure sensor 14. The computer program or data can be transferred and stored from the external device (storage medium MM or server 50) to the storage device 23, or conversely, the computer program or data in the storage device 23 can be transferred to the external device. it can.

The communication unit 24 is a device that connects to the communication network CN and communicates with the operator terminal 30 or the like wirelessly or by wire. The communication network CN is, for example, the Internet or a LAN (Local Area Network).

The input / output unit (I / O in the figure) 25 is a device that sends and receives signals to and from each actuator 13 and each pressure sensor 14. In FIG. 1, the line connecting the input / output unit 25, each actuator 13, and each pressure sensor 14 is omitted. The control signal including the control value calculated by the microprocessor 21 is sent to the actuators 13 and 15 via the input / output unit 25, whereby the thickness dimension of each cell 12 or the inclination of the protective bed 1 changes. On the other hand, the pressure detected by each pressure sensor 14 is received by the controller via the input / output unit 25 and stored in the storage device 23.

The operator terminal 30 is a device operated by an operator such as a nurse, a caregiver, or a family member. The operator terminal 30 accesses the controller 20 via the communication network CN. By using the operator terminal 30, the operator acquires the state of the nursing bed 1 (mattress 11) from the controller 20 and instructs the controller 20 to control the nursing bed 1 (mattress 11).

The operator terminal 30 is configured as, for example, a mobile phone (including a so-called smartphone), a mobile information terminal (including a so-called tablet terminal), a personal computer such as a desktop type or a notebook type, and a wearable terminal such as a wristwatch type or a glasses type. Will be done. The operator terminal 30 includes, for example, a display unit 31, an operation unit 32, and a communication unit (not shown). The display unit 31 displays, for example, the state of the nursing bed 1. The operation unit 32 sends an operator's instruction to the controller 20.

Note that FIG. 1 shows a case where the operator terminal 30 and the server 50 are connected to the controller 20 by using a common communication network CN, but instead of this, communication connecting the operator terminal 30 and the controller 20 is performed. The route and the communication route connecting the server 50 and the controller 20 may be different.

The server 50 is, for example, a computer that receives data indicating the state of the nursing bed 1 from the controller 20 and statistically processes and stores the data. The server 50 can also remotely monitor a plurality of distributed nursing care beds 1.

FIG. 2 is an explanatory diagram showing a location (specific site) where a pressure ulcer is likely to occur. FIG. 2 (1) shows a case where the user is lying on his back. When the user takes the supine position, for example, pressure ulcers occur in specific parts such as the occipital region 41 (1), the scapula 41 (2), the elbow 41 (3), the sacrum 41 (4), and the heel 41 (5). Cheap.

FIG. 2 (2) shows a case where the user is lying down. When the user takes a recumbent position, for example, ears 41 (6), shoulders 41 (7), elbows 41 (8), ilium 41 (9), greater trochanter 41 (10), knees 41 (11), Pressure ulcers are likely to occur at specific sites such as the outer malleolus 41 (12).

In this way, the weight of the user acts on the muscles and skin of a specific site for a long time through the bones, resulting in deterioration of blood circulation and pressure ulcers. Therefore, in this embodiment, the cell 12 located at a specific site where a pressure ulcer is likely to occur is set lower than the surrounding cells 12 to prevent the user's body from coming into contact with the cell 12. Thereby, in this embodiment, the force acting on a specific site is reduced and the occurrence of pressure ulcer is prevented.

FIG. 3 is an explanatory diagram showing the operation of the cell 12. FIG. 3 (1) shows an initial state before controlling the height dimension of each cell 12. FIG. 3 (2) shows a state in which the height dimension of the predetermined cell 12S corresponding to the specific site of the user is set lower than that of the surrounding cells 12 in order to prevent the occurrence of the pressure ulcer 41.

By setting the height of the predetermined cell 12S low, the area where the predetermined cell 12S and a specific part of the body of the user 40 come into contact with each other can be reduced. A minute space 120 may be formed between the specific portion of the user 40 and the predetermined cell 12S. If it is possible to prevent a specific portion of the user's body corresponding to a protruding portion such as a bone from being strongly pressed against the cell 12 for a long time, the occurrence of pressure ulcer 41 can be suppressed. The controller 20 adjusts the height dimension of each cell 12 so as to achieve this purpose.

Instead of adjusting the height dimension, the hardness of each cell 12 may be adjusted. For example, by setting the predetermined cell 12S corresponding to the specific portion to be softer than the other surrounding cells, it is possible to prevent a strong body pressure from acting on the specific portion.

FIG. 4 is a flowchart showing a process of controlling the mattress 11. This process is executed by the controller 20.

The controller 20 determines whether or not the predetermined pressure ulcer prevention timing has arrived (S11), and if it determines that the predetermined pressure ulcer prevention timing has arrived (S11: YES), executes the pressure ulcer prevention process (S12). Subsequently, the controller 20 determines whether or not the predetermined blood circulation promotion timing has arrived (S13), and if it determines that the predetermined blood circulation promotion timing has arrived (S13: YES), executes the blood circulation promotion process (S14). Further, the controller 20 determines whether or not the predetermined position change timing has arrived (S15), and if it determines that the predetermined position change timing has arrived (S15: YES), executes the position change process (S16). Details of the pressure ulcer prevention treatment (S12), blood circulation promotion treatment (S14), and posture change treatment (S16) will be described later in FIGS. 6 to 10.

FIG. 5 is an example of a screen displayed on the display unit 31 of the operator terminal 30. The screen 330 is, for example, a user information display unit 331, a cell status display unit 332, an executing mode display unit 333, an execution schedule display unit 334, a pressure detection button 335, a pressure ulcer prevention button 336, and blood circulation promotion. It includes a button 337 and a position change button 338.

The user information display unit 331 is an area for displaying information about the user 40. The user information can include, for example, the name and identifier of the user, the name of the attending physician, the nurse, the name of the disease, the pre-existing condition, the type of drug, and the like. The body temperature, blood pressure, pulse, etc. of the user may be detected and displayed by including them in the user information.

The cell status display unit 332 is an area for displaying the relationship between each cell 12 of the mattress 11 and the user 40. The shaded cells represent a predetermined cell 12S corresponding to a specific portion of the user 40. The pressure of each cell 12 may be displayed on the cell status display unit 332.

The operator can also adjust the height dimension of a desired cell by selecting and touching a desired cell from each cell 12 displayed on the cell status display unit 332. For example, the display unit 31 is configured as a touch panel, and the operator presses the portion corresponding to the cell 12 with a fingertip to adjust the height dimension of the pressed cell. The height dimension may be shortened when the operator presses the portion corresponding to the cell 12 once, and returns to the original height dimension when the operator presses the same portion again. Alternatively, the height dimension of the corresponding cell may be gradually changed when the operator presses it for a predetermined time or longer.

The executing mode display unit 333 displays the control process (mode) currently being executed among the pressure ulcer prevention process, the blood circulation promotion process, and the position change process. When multiple control processes are executed at the same time, the names of the control processes being executed are displayed.

The execution schedule display unit 334 displays the execution schedule of the control process. For example, by displaying the time on the horizontal axis and the name of the control process on the vertical axis, it is possible to inform the operator when each control process (mode) is executed.

For example, the postural change process is executed once every two hours, and the blood circulation promotion process is executed in a cycle shorter than the postural change process cycle. The pressure ulcer prevention treatment may be performed at a cycle longer than the cycle of the postural change treatment. The execution schedule can be arbitrarily set or modified by the operator by observing the state of the user.

The pressure detection button 335 is a button for detecting the pressure of each cell 12 by the pressure sensor 14. The pressure ulcer prevention button 336 is a button for executing the pressure ulcer prevention process separately from the execution schedule. Similarly, the blood circulation promotion button 337 is a button for executing the blood circulation promotion process separately from the execution schedule. The position change button 338 is also a button for executing the position change process separately from the execution schedule.

FIG. 6 is a flowchart showing a pressure ulcer prevention treatment (S12). The controller 20 acquires the pressure P detected by each pressure sensor 14 (S121), and automatically or manually selects a predetermined cell.

When automatically selecting a predetermined cell, the controller 20 compares the pressure P detected in step S121 with the preset predetermined pressure ThP, and whether there is a cell whose pressure P is equal to or higher than the predetermined pressure ThP. Judgment (S122). The controller 20 selects a cell whose pressure P is equal to or higher than a predetermined pressure ThP as a predetermined cell for setting a low pressure (S123). In FIG. 6, a cell for which the height dimension is set to be short is expressed as a “predetermined cell to be concave”.

The case where the operator manually selects a predetermined cell will be described. The pressure distribution detected in step S121 is notified to the operator by the operator terminal 30 (S124). For example, by displaying the pressure of each cell 12 on the cell state display unit 332, the pressure distribution (body pressure distribution) can be transmitted to the operator. The user manually selects and stores a predetermined cell by observing the pressure distribution (S125, S123).

The controller 20 compares the total area S concave of the predetermined cell stored in step S123 with the preset predetermined area ThS, and determines whether the total area S concave of the predetermined cell is larger than the predetermined area ThS (S126). ).

When the controller 20 determines that the total area S concave of the predetermined cell is larger than the predetermined area ThS (S126: YES), the controller 20 outputs an alarm to the operator via the operator terminal 30 (S127). The fact that the total area S concave of a predetermined cell is larger than the predetermined area ThS means that the number of cells having a normal height other than the predetermined cell is small, and the user is supported by a small number of cells. Represents.

On the other hand, when the total area S concave of the predetermined cell is less than the predetermined area ThS (S126: NO), the controller 20 sets the height dimension of the predetermined cell stored in step S123 to a predetermined value smaller than the normal value. A control signal for changing to is transmitted to the actuator 13 (S128). It is not necessary to transmit the control signal to the actuator 13 corresponding to the cell whose height dimension has already been set to a predetermined value. The control signal for changing to a predetermined value may be transmitted only to the actuator 13 corresponding to the cell set to the normal value.

FIG. 7 is a flowchart showing the blood circulation promoting process (S14). The controller 20 acquires the pressure detected by each pressure sensor 14 (S141), and the number of cells in contact with the user 40 and the number of cells not in contact with the user 40 other than the cells selected as the pressure ulcer prevention cells. The ratio with and is calculated (S142). Then, the controller 20 changes the cells that come into contact with the user 40 in the predetermined area at a predetermined cycle so that the ratio of the cells that come into contact with the user 40 and the cells that do not come into contact with the user 40 becomes a predetermined ratio for each predetermined area. (S143).

FIG. 8 is an explanatory diagram showing a method of dividing cells in a predetermined area into cells that come into contact with the user and cells that do not come into contact with the user. Here, for example, a total of 9 cells 12 of 3 × 3 are designated as cells in a predetermined area. It is assumed that the central cell 12 (# 5) is a predetermined cell (pressure ulcer prevention cell) corresponding to a specific site, and the height dimension is set short.

As shown in FIG. 8 (1), among the cells (# 1 to # 4, # 6 to # 9) other than the pressure ulcer prevention cell (# 5), for example, the cell (# 1) and the cell (# 6) ), The height dimension of the cell (# 7) is set short.

As shown in FIG. 8 (2), the height dimensions of the cell (# 3), the cell (# 4), and the cell (# 9) are subsequently set short. The height dimensions of the previously set short cell (# 1), cell (# 6), and cell (# 7) are returned to the normal values.

As shown in FIG. 8 (3), the height dimensions of the cell (# 2), the cell (# 6), and the cell (# 8) are subsequently set short. The height dimensions of the previously set short cell (# 3), cell (# 4), and cell (# 9) are returned to the normal values.

As described above, in the blood circulation promoting treatment (S14), the height dimension of cells other than the pressure ulcer prevention cell is periodically changed in units of predetermined regions to stimulate the body of the user 40 and promote blood circulation. ..

FIG. 9 is a flowchart showing the posture change process (S16). The controller 20 changes the posture of the user 40 by projecting a specific cell 12 from other surrounding cells 12 in a predetermined cycle such as a 2-hour cycle.

When the body of the user 40 tilts in a predetermined direction due to the deformation of a part of the mattress 11 (S161), the controller 20 waits for the predetermined time to elapse (S162: YES), and the other one of the mattress 11 By deforming the portion, the body of the user 40 is tilted in the opposite direction (S163). Then, the controller 20 determines whether to end the posture change process (S164), and if it ends (S164: YES), ends this process. If it does not end (S164: NO), the process returns to step S162.

In this way, in the body position change process (S16), the body position of the user 40 is changed by partially projecting the mattress 11 at predetermined time intervals and tilting the body of the user 40.

FIG. 10 is a flowchart of alarm processing. The alarm processing can be performed after the postural change.

The controller 20 detects the pressure of each cell 12 based on the signal from each pressure sensor 14 (S22), and calculates the number of cells in contact with the user's body and the number of cells not in contact with each other. Then (S23), the calculated value is stored in the storage device 23 (S24).

The controller 20 determines whether or not the position change is completed (S25), and if not (S25: NO), returns to step S22, acquires the pressure of each cell 12 again, and counts the number of contact cells and the non-contact cell. And the number of the above are calculated and stored in the storage device 23 (S23, S24).

When the posture change is completed (S25: YES), the controller 20 has a ratio of the number of cells 12 in contact with the user's body and the number of cells 12 not in contact with the user's body different by a predetermined alarm threshold value or more before and after the posture change. Is determined (S26).

When the ratio of the number of contact cells to the number of non-contact cells differs by a predetermined alarm threshold value or more (S26: YES), the controller 20 issues an alarm to the operator via the operator terminal 30 (S27). As a result, the operator knows that the position of the user 40 changes and that the number of cells supporting the user's body changes significantly. The smaller the number of cells that support the user's body, the greater the pressure exerted on the contact cells, which can lead to pressure ulcers. Therefore, the operator can carefully care for the person by grasping in advance the positions in which pressure ulcers are likely to occur (for example, right-facing recumbent position and left-facing recumbent position).

According to the present embodiment configured as described above, by shortening the height dimension of the cell 12 corresponding to the specific part of the user 40, the pressure acting on the specific part can be reduced and the occurrence of pressure ulcer can be prevented. be able to.

Further, according to this embodiment, a pressure ulcer prevention cell (predetermined cell) can be manually or automatically selected from each cell 12. Thereby, in this embodiment, even an inexperienced operator can select an appropriate cell as the pressure ulcer prevention cell, and the usability is improved.

Further, according to the present embodiment, since either or both of the blood circulation promoting treatment and the repositioning treatment can be performed in parallel with the pressure ulcer prevention treatment, not only the pressure ulcer prevention but also the blood circulation promotion or the repositioning can be realized. It can be done and usability is improved.

Further, in the blood circulation promoting treatment, the blood circulation of the user 40 is promoted by periodically changing the height dimension of the cells other than the pressure ulcer prevention cell in units of predetermined regions. That is, in this embodiment, blood circulation can be promoted while supporting the user's body with a predetermined number of cells at all times, and it is possible to prevent a large body pressure from acting on a part of the user's body.

Further, in this embodiment, when the number of cells supporting the body of the user 40 changes significantly before and after the posture change, the operator is notified of an alarm. As a result, the operator can know in advance the position that places a heavy burden on the user, and the quality of the nursing care service is improved.

The second embodiment will be described with reference to FIG. In the nursing bed 1A of this embodiment, the mattress 11A of the bed body 10A includes a plurality of types of cells 12, 12A, 12B, and 12C having different sizes.

Most areas, including the central portion of the mattress 11A, are composed of the normal size cells 12 described in the first embodiment. Around the mattress 11A, cells 12A, 12B, and 12C having a size different from the normal size are arranged.

For example, large-sized cells 12A are arranged at the four corners of the mattress 11A. Medium-sized cells 12B are arranged on both sides of the mattress 11A in the longitudinal direction. Small-sized cells 12C are arranged on the head side and the toe side of the mattress 11A. Even the small-sized cell 12C has a larger area than the normal-sized cell 12. The shape and size of the cell are not limited to the illustrated example.

This embodiment configured in this way also has the same effect as that of the first embodiment. Further, in this embodiment, since the cell size is appropriately changed, the cell at the portion where the body of the user 40 is difficult to contact can be enlarged, and the other cells can be decreased.

A third embodiment will be described with reference to FIG. In the nursing bed of the present embodiment, the controllers 20 (1) to 20 (n) of the plurality of nursing beds 1B (1) to 1B (n) and the plurality of operator terminals 30 (1) to 30 (n) are communicated with each other. Connect via CN1. The server 50 may centrally manage the control contents of the controllers 20 (1) to 20 (n).

According to the present embodiment configured as described above, since the plurality of nursing care beds 1B can be managed by the plurality of operators 30, it can be applied even when the number of beds is large.

The present invention is not limited to the above-mentioned examples, and includes various modifications. For example, the above-described embodiment describes the present invention in an easy-to-understand and detailed manner, and is not necessarily limited to the one having all the configurations described. It is possible to replace part of the configuration of one embodiment with the configuration of another embodiment. It is also possible to add the configuration of another embodiment to the configuration of one embodiment. It is also possible to add / delete / replace a part of the configuration of each embodiment with another configuration.

1,1A, 1B: Nursing bed, 10,10A, 10B: Bed body, 11,11A: Mattress, 12,12A, 12B, 12C: Cell, 13: Actuator, 14: Pressure sensor, 15: Position change actuator, 20: Controller, 30: Operator terminal, 40: User, 41: Site where pressure ulcer occurs

Claims (13)

It ’s a mattress
Multiple movable parts that can be displaced in the thickness direction,
A drive unit that displaces each movable unit and
A sensor unit that detects the pressure acting on each of the movable parts, and
A pressure ulcer prevention treatment that controls the drive unit so that the height dimension of a predetermined movable portion of each of the movable portions differs from the height dimension of the other movable portion based on the pressure detected by the sensor unit. A mattress with a control unit to perform. The control unit controls the drive unit so that the height dimension of the predetermined movable portion is smaller than the height dimension of the other movable portion located around the predetermined movable portion.
The mattress according to claim 1. The predetermined movable part is set corresponding to a predetermined position of the user.
The mattress according to claim 2. The control unit controls the drive unit so that the contact area between the predetermined location and the predetermined movable portion becomes small.
The mattress according to claim 3. The predetermined location is a location where the occurrence of pressure ulcer is predicted.
The mattress according to claim 3. Further, a selection unit for selecting the predetermined movable portion from the movable portions is provided.
The mattress according to any one of claims 1 to 5. The selection unit manually selects the predetermined movable unit by the operator's operation on the screen displaying the relationship between each movable unit and the user.
The mattress according to claim 6. The selection unit automatically selects the predetermined movable unit by comparing the pressure detected by the sensor unit with a predetermined pressure set in advance.
The mattress according to claim 6. In addition to the pressure ulcer prevention treatment, the control unit can also execute a blood circulation promoting treatment that promotes blood circulation of the user.
The mattress according to any one of claims 1 to 8, wherein the blood circulation promoting treatment is a treatment for promoting blood circulation of a user by periodically changing the height dimension of the other movable portion. In the blood circulation promoting treatment, among the other movable parts in the predetermined area, the movable part on which the pressure exerted by the user acts is dispersed in the predetermined area with the passage of time. Height dimensions are controlled,
The mattress according to claim 9. In addition to the pressure ulcer prevention treatment, the control unit can also perform a position change process that changes the position of the user.
The posture change process changes the posture of the user by setting the height dimension of the movable portion arranged at a predetermined position among the movable portions to be larger than the normal height dimension.
The mattress according to any one of claims 1 to 10. The control unit compares the number of movable parts that come into contact with the user and the number of movable parts that do not come into contact with the user among the other movable parts before and after the change of the user's body position. An alarm is issued to the operator when the ratio differs by more than a predetermined value.
The mattress according to claim 11. The area of each movable portion differs between the peripheral portion and the central portion of the mattress.
The mattress according to claim 1.

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