JP5592724B2 - Air mat device - Google Patents

Description

  The present invention relates to an air mat device used in, for example, a medical facility or a nursing facility.

  Conventionally, for example, an air mat device disclosed in Patent Document 1 includes an air mat in which a plurality of independent cells are juxtaposed in the height direction when a patient is sleeping, and a pressure distribution that acts on each cell by a lying patient. A sheet-like pressure sensor for detecting the air and an air supply / discharge device connected to each cell and supplying / discharging air to / from each cell, and a control device is connected to the pressure sensor and the air supply / discharge device. Has been. The control device includes a pressure storage unit that stores a preset pressure setting value for each cell. When the detected value of the pressure sensor exceeds the pressure setting value, air supply to the cell is performed. The air supply / exhaust device is controlled so as to reduce the amount and reduce the pressure applied to the cell, thereby avoiding concentration of pressure at a specific position of the lying patient and causing bed slip and pain. It is made difficult to occur.

JP 2007-125313 A (paragraph 0049 column to 0051 column, FIG. 1, FIG. 4 and FIG. 7)

  However, in the air mat device of Patent Document 1, since the air supply amount of the cell at a specific location is reduced and the state is maintained, the cell corresponding to the location becomes softer than the cells at other locations, The part of the patient's body corresponding to that part sinks into the air mat. Therefore, the patient's sleeping posture is deteriorated, and comfort is impaired.

  By the way, it is generally known that repetitive pressing rather than continuously pressing a part of the human body promotes circulatory circulation of venous blood and lymph, and increases inflow of arterial blood to improve blood circulation. Yes.

  The present invention has been made in view of such a point, and the object of the present invention is to suppress the occurrence of bedsores and pain without squeezing blood vessels even when a patient lies for a long time, and to improve blood circulation. An object of the present invention is to provide a highly comfortable air mat device.

  In order to achieve the above object, according to the present invention, when a high pressure is applied to a part of a patient's body lying on an air mat, the control device only reduces the amount of air supplied to the cell corresponding to the location. Instead, it is controlled to repeat the decrease and increase.

  Specifically, an air mat in which a plurality of independent cells are juxtaposed in the height direction at the time of the patient's sleeping posture, a pressure sensor that detects a pressure distribution acting between each of the cells and the patient, and each of the above In an air mat device that is connected to a cell and includes an air supply / discharge device that supplies / discharges air to / from each cell, the following solution is taken.

That is, in the first aspect of the invention, the pressure sensor and the air supply / exhaust device are connected to each other, and a pressure storage unit that stores a preset pressure value for each cell is stored. A control device for controlling the air supply / exhaust device so as to repeat the decrease / increase of the cell internal pressure as time elapses when the pressure set value is exceeded, and the air mat has a plurality of cells arranged in a row on the front side; And a second cell group in which a plurality of cells are arranged in a line along the first cell group on the lower side of the first cell group. Each cell of the group is arranged correspondingly across a plurality of cells of the first cell group, and the control device is configured to repeat the decrease / increase in the internal pressure of each cell of the first cell group. In addition, the detection value of the pressure sensor is set for each cell of the second cell group. It exceeds a preset pressure setpoint, while the at least one internal pressure of the plurality of cells of the first cell group corresponding to the cell beyond the pressure setpoint is maintained an increased state, the pressure setting The air supply / exhaust device is controlled so as to repeat the decrease / increase of the internal pressure of the cells of the second cell group exceeding the value as time elapses.

In the second invention , each cell of the second cell group is arranged correspondingly so as to straddle two adjacent cells of the first cell group, and the control device includes two adjacent cells of the first cell group. the internal pressure controls the air supply and discharge device so that one internal pressure repeatedly decreases, increase alternately the other pressure is increasing state during the decreasing state, further, the detection value of the pressure sensor and the second When the pressure set value preset for each cell in the cell group is exceeded, the pressure set value is exceeded while the internal pressure of one of the two adjacent cells in the first cell group is maintained in an increasing state. The air supply / exhaust device is controlled so as to repeat the decrease / increase of the internal pressure of the cells of the second cell group as time passes.

According to a third invention , in the first or second invention, the pressure sensor is arranged on each cell of the first cell group.

In a fourth invention , in the air mat device according to any one of the first to third aspects, the air mat is arranged in a line along the second cell group below the second cell group. A third cell group is provided, and the control device controls the air supply / discharge device so that the pressure in each cell of the third cell group is maintained at a predetermined value or more.

In a fifth aspect of the present invention , in the air mat device according to any one of the first to fourth aspects, the pressure storage unit also stores an internal pressure value set in advance for each cell corresponding to each posture of the patient. The control device includes a body position determination unit that determines each posture of the patient based on the pressure distribution of the pressure sensor, and the pressure in each cell is based on the determination result of the body position determination unit. The air supply / exhaust device is controlled so as to have the internal pressure value stored in the storage unit.

In the first invention, when a predetermined high pressure acts on the pressure sensor, the internal pressure of the cell corresponding to the location is periodically decreased and increased, so that the location is not continuously applied with a high pressure. Therefore, it is possible to suppress the occurrence of bed slipping and pain of the patient. And since the internal pressure of the cell corresponding to the relevant part is not kept reduced, the part of the patient's body corresponding to the relevant part is not maintained in a depressed state, and comfort is maintained without disturbing the sleeping posture of the patient. Can be kept high. In addition, by decreasing / increasing the internal pressure of the cell corresponding to the location as time passes, the veins, arteries, and lymph of the location are repeatedly released and pressed, and venous blood and lymph circulation are In addition to being promoted, the circulation of arterial blood can be promoted to improve blood circulation.
Furthermore, each cell of the first cell group repeatedly decreases and increases, so that the pressure on the blood vessels of the entire body of the patient on the air mat can be relieved to prevent bed slipping and pain. In addition to this, especially in places where high pressure is detected by the pressure sensor, the cells of the second cell group are not further compressed using the cells of the second cell group, and the internal pressure of the cells of the second cell group is reduced. Since the internal pressure of at least one of the cells of the plurality of first cell groups straddling the cells of the second cell group is not decreased, a part of the patient's body at that location is deeply depressed. Can be avoided, and it is possible to prevent the sleeping posture of the patient from being lost while effectively suppressing the occurrence of bedsores and pain.

In the second invention, adjacent cells of the first cell group alternately decrease / increase to relieve pressure on the blood vessels of the patient's entire body on the air mat and suppress the occurrence of bedsores and pain. it can. In addition to this, especially in places where high pressure is detected by the pressure sensor, the cells of the second cell group are not further compressed using the cells of the second cell group, and the internal pressure of the cells of the second cell group is reduced. When one of the cells in the two first cell groups straddling the cells in the second cell group, the internal pressure has not decreased, so that the part of the patient's body in the relevant area sinks deeply. It is possible to avoid this, and it is possible to prevent the sleeping posture of the patient from being destroyed while effectively suppressing the occurrence of bedsores and pain.

In the third aspect of the invention, the pressure acting on the patient on the air mat is directly transmitted to the pressure sensor, and precise pressure measurement is possible. Therefore, the internal pressure of the cell at the exact position corresponding to the high pressure point can be reduced. Will be able to control.

In 4th invention, when the internal pressure of the cell of a 1st cell group and a 2nd cell group reduces, it can prevent reliably that a patient contacts a bed frame etc., and it can be set as the air mat apparatus with high safety | security with respect to a patient.

In the fifth invention, since the air mat is changed to an optimum hardness according to the posture of the patient on the air mat, the comfort is not impaired regardless of the posture of the patient on the air mat.

It is a perspective view of a bed provided with an air mat device concerning an embodiment of the present invention. It is a block diagram of an air mat device concerning an embodiment of the present invention. 3A and 3B are side views of the air mat placed on the bed frame, in which FIG. 3A shows a normal state, and FIGS. 3B and 3C show that the cells of the first cell group alternately decrease / increase. While it repeats, the state which the specific cell of a 2nd cell group is repeating reduction and increase is shown. It is a block diagram of a control apparatus. It is a graph which shows control of the pressure switching mode of the control apparatus in the embodiment of the present invention, and partial pressure switching mode, and shows the operation timing of the cell of the 1st cell group, and the specific cell of the 2nd cell group. It is the figure which showed the pressure distribution which acts on the patient who lies on an air mat. It is the figure which each showed the combination of the internal pressure value in each cell according to each combination of body posture determination, body movement determination, and body type determination. It is a flowchart of the control action in the automatic driving | operation of an air mat apparatus. It is a flowchart of the control operation | movement in a body posture determination process. It is a flowchart of the control operation | movement in a body movement determination process.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. The following description of the preferred embodiment is merely exemplary in nature.

  FIG. 1 is a perspective view of a bed B provided with an air mat device 1 according to an embodiment of the present invention. The air mat device 1 includes a pressure sensor 8 (see FIG. 3) that detects the body pressure of an air mat 2 that is used by being placed on the bed frame F of the bed B, and a patient Y (shown in FIG. 3A) on the air mat 2. And a control box 3 for controlling the amount of air supplied to the air mat 2. The control box 3 is supplied with power by a power cord W and is attached to the bed frame F. The headboard Hb is used by being hooked. The air mat 2 and the control box 3 may be used by being placed directly on a tatami mat or a floor.

  As shown in FIG. 3, the air mat 2 includes a first cell group 12 in which a plurality of independent cells arranged in parallel in the height direction of the patient's sleeping posture are arranged in a row on the front side, and a plurality of cells are the above-described A second cell group 11 arranged in a line along the first cell group 12 below the first cell group 12, and along the second cell group 11 below the second cell group 11. A third cell group 10 is provided in a line. Each cell of the first cell group 12, the second cell group 11, and the third cell group 10 is airtightly configured with a flexible resin sheet, and the inside thereof is filled with air. . Each cell of the first cell group 12 is called a first cell 12A, 12B ..., each cell of the second cell group 11 is called a second cell 11A, 11B, ..., 11N, and each cell of the third cell group 10 is called The cells are called third cells 10, 10,.

  The first cells 12A and 12B have a cylindrical shape extending in the width direction of the air mat 2, and 14 cells are alternately arranged in parallel from the head side of the patient Y toward the toes. The first cells 12A, 12A,... Communicate with each other, and are connected to one pipe 22A (shown in FIG. 2) extending from the control box 3, and all the first cells 12A, Air is supplied to and discharged from 12A,. The first cells 12B, 12B,... Are also in communication with each other, and a single pipe 22B extending from the control box 3 is connected to the first cells 12B, 12B,. At the same time, air is supplied and discharged. That is, each of the first cell 12A and the first cell 12B is supplied and exhausted by separate piping systems, and can adjust the air supply amount to each piping system. Therefore, as shown in FIGS. 3 (b) and 3 (c), the first cell 12A and the first cell 12B are alternately decreased and increased repeatedly to relieve pressure on the blood vessels of the entire body of the patient Y on the air mat 2. In this way, the occurrence of bedsores and pain can be suppressed.

  The second cells 11A, 11B,..., 11N have a cylindrical shape extending in the width direction of the air mat 2 and are arranged in parallel from the head of the patient Y toward the toes. The diameters of the second cells 11A, 11B,..., 11N are set larger than the diameters of the first cells 12A, 12B, and each of the second cells 11A, 11B,. Correspondingly arranged so as to straddle the cells 12A and 12B. To the second cells 11A, 11B,..., 11N, 14 pipes 21A to 21N (a part of which are shown in FIG. 2) extending from the control box 3 are connected, respectively, and independent through the pipes 21A to 21N. Air is supplied and exhausted. Therefore, the internal pressure can be controlled by independently adjusting the air supply amount to each of the second cells 11A, 11B,..., 11N, and to the specific cell of each of the second cells 11A, 11B,. The internal air pressure of the cell can be adjusted by decreasing / increasing the air supply amount, and the decrease / increase can be repeated periodically (parts are shown in FIGS. 3B and 3C). .

  Each of the third cells 10 has a cylindrical shape extending in the width direction of the air mat 2 and is 13 below the second cells 11A, 11B,..., 11N from the head side of the patient Y toward the toes. These are arranged in parallel, and each is positioned between the second cells 11A, 11B,..., 11N. Each of the third cells 10 is connected to one pipe 20 (shown in FIG. 2) extending from the control box 3 so that air is supplied to and discharged from all the third cells 10 through the pipe 20 at the same time. The patient Y contacts the bed frame F even in an emergency in which the amount of air supplied to and discharged from the first cells 12A, 12B and the second cells 11A, 11B,. Thus, it is possible to reliably prevent the bed frame F from being directly felt.

  In addition, the number of each of the first cells 12A, 12B, the second cells 11A, 11B,..., 11N and the third cells 10 is not limited to the number described above, and a plurality of the cells may be provided.

  Each of the second cells 11A, 11B,..., 11N is disposed so as to straddle the two first cells 12A, 12B, but is disposed corresponding to one of the first cells 12A, 12B. It may be arranged correspondingly so as to straddle three or more 12A, 12B.

  As shown in FIG. 6, the pressure sensor 8 detects a distribution of pressure acting on each part of the body of the patient Y lying on the air mat 2, and is connected to the control device 5 described later and detects the detected pressure. A signal relating to the distribution is transmitted to the control device 5. As shown in FIG. 3, the pressure sensor 8 has a sheet-like form extending in the longitudinal direction of the first cells 12A and 12B, and a plurality of pressure sensitive points are located in the longitudinal direction of the first cells 12A and 12B. They are provided at a predetermined interval. And the said pressure sensor 8 is provided for every said 1st cell 12A, 12B, and is arrange | positioned on 1st cell 12A, 12B, Thereby, the pressure which acts on the patient Y on the air mat 2 is a pressure. It can be directly transmitted to the sensor 8, and precise pressure measurement is possible. The first cells 12A and 12B are connected to the two pipes 22A and 22B, respectively. However, the first cells 12A and 12B are not limited to the two pipes, and are connected to each pipe so as to be connected to three or more pipes. You may make it perform fine pressure regulation for every cell currently made.

  The pressure sensor 8 may be provided between the first cells 12A, 12B and the second cells 11A, 11B,. In this embodiment, as shown in FIG. 3, the pressure sensors 8 are arranged on all the first cells 12A and 12B. However, if the pressure detection is not a problem, all the first sensors are arranged. It is not necessary to arrange on the cells 12A and 12B. For example, the pressure sensor 8 may not be arranged on the first cells 12A and 12B located at the head side end or the foot side end of the patient Y.

  As shown in FIG. 2, the control box 3 is connected to the air mat 2, and air is supplied to the first cell 12A, 12B, the second cell 11A, 11B,..., 11N and the third cell 10 of the air mat 2, respectively. An air supply / discharge device 4 for supply / discharge, a control device 5 for controlling the air supply / discharge device 4 based on a detection value of the pressure sensor 8, and an operation panel 6 for inputting and displaying settings and the like. ing.

  The air supply / exhaust device 4 includes a first air pump 41 and a second air pump 48 that are conventionally known and equipped with an electric motor capable of continuously discharging air, and a discharge pipe 46 connected to the first air pump 41. A distribution valve 42 that is connected and distributes the air discharged from the first air pump 41 to the first cells 12A and 12B, a first air pressure sensor 43 that detects the pressure in the discharge pipe 46, and the second air pump. , 11N and the third cells 10, 10, and the second cells 11 A, 11 B,..., 11 N and the third cells 10. Second air pressure sensors 45 </ b> A to 45 </ b> N and a third air pressure sensor 49 for detecting the pressures in the.

  The distribution valve 42 has an independent connection port to which pipes 22A and 22B communicating with the first cells 12A and 12B are connected.

  The distribution valve 42 has a built-in valve body whose position can be changed by a control motor (not shown). By changing the position of the valve body based on a signal from the control device 5, One connection port is opened and the other connection port is closed. That is, when the position of the valve body is changed, for example, when the connection port of the pipe 22A connected to the first cell 12A is opened, the other connection port is closed and only the pipe 22A connected to the first cell 12A is closed. Is communicated with the discharge pipe 46. Further, when the air in the first cell 12A is discharged, the valve body is moved and discharged from an exhaust port (not shown).

  Further, the distribution valve 42 is provided with a valve body position detection sensor 47 for detecting the position of the valve body. The valve body position detection sensor 47 is connected to the control device 5 and is not shown, but a disk with a slit integrated with the valve body, a light emitting element that emits light from the front side of the disk, and a light emitting element And a light receiving element that detects light that has passed through the slit and reached the back side of the disk. The position of the valve body can be obtained by detecting the light passing through the slit with the light receiving element.

  The first air pressure sensor 43 is provided in the discharge pipe 46 of the first air pump 41. The first air pressure sensor 43 is configured to detect the pressure in the discharge pipe 46 at any time, convert it into an electrical signal, and send a signal to the control device 5. For example, when the pressure in the first cell 12A is detected, the valve body of the distribution valve 42 is moved, and the pipe 22A connected to the first cell 12A and the discharge pipe 46 are communicated to each other in the first cell 12A. Pressure is detected. The first air pressure sensor 43 is calibrated (zero point correction) in a state in which no air is applied to the first air pump 41, and thereby, the first air sensor 43 in the first cells 12A and 12B. The pressure can be measured accurately. The first air pressure sensor 43 may be provided in the pipes 22A and 22B to directly detect the pressure in the first cells 12A and 12B.

  The electromagnetic valve 44 indicates a group of electromagnetic valves arranged for the pipes 22A to 22N and 23 connected to the second cells 11A, 11B,..., 11N and the third cell 10, respectively. By changing the position of the valve body based on the signal from the device 5, the connection ports of the pipes 22A to 22N and 23 connected to the second cells 11A, 11B,. It can be opened and closed. When power is not supplied as in the case of a power failure, the solenoid valve 44 is closed to prevent air from escaping from the third cell 10, and the third cell 10 can be maintained in an expanded state. It is like that. Further, when the air from the second cells 11A, 11B,..., 11N and the third cells 10 is discharged, the valve body is moved and discharged from an exhaust port (not shown).

  Further, the solenoid valve 44 is provided with a valve body position detection sensor 47 connected to the control device 5, similarly to the distribution valve 42, and the valve body position detection sensor 47 detects the valve body of the solenoid valve 44. The position can be detected.

  The second air pressure sensors 45A to 45N and the third air pressure sensor 49 are provided in the pipes 21A to 21N and the pipe 20, respectively, and detect the pressure in each pipe and convert it into an electric signal. It is configured to send the electrical signal.

The operation panel 6 is for an operator such as a caregiver or a nurse to input various setting values or the like with a predetermined switch, or to display or notify the state of the patient Y on the air mat. That is, on the operation panel 6, although not shown, various switches for setting the internal pressure value P _{n and the} like in the first cell 12A, 12B, the second cell 11A, 11B,. As shown in FIG. 4, a display monitor for the pressure distribution detected by the pressure sensor 8 is provided.

  Although not shown, the control device 5 includes a central processing unit (CPU), a memory storing a control program, and the like. The control device 5 includes a pressure sensor 8, a first air pump 41, a second air pump 48, a distribution valve 42, a first air pressure sensor 43, second air pressure sensors 45 </ b> A to 45 </ b> N, An air pressure sensor 49, an electromagnetic valve 44, and valve body position detection sensors 47, 47 are connected, and further, each switch of the operation panel 6 is connected, and signals are input from these. The control device 5 processes signals input from the switches of the operation panel 6, the pressure sensor 8, the first air pressure sensor 43, the second air pressure sensors 45A to 45N, and the valve body position detection sensors 47 and 47. Thus, the first air pump 41, the second air pump 48, the distribution valve 42 and the electromagnetic valve 44 are controlled.

  As shown in FIG. 4, the control device 5 is provided with a body posture determination unit 5 a that determines the posture of the patient based on the pressure distribution of the pressure sensor 8.

The body position determination unit 5a determines whether the patient Y is getting out of bed, based on a predetermined reference value (reference weight, reference load range, and reference load ratio) set in advance and a detection value detected by the pressure sensor 8. It is designed to determine which of the sitting position, the back raising and the supine position. For example, a value calculated by multiplying a detection value detected by the pressure sensor 8 by a predetermined coefficient is used as an estimated weight, and if the weight is less than the reference weight W, it is determined that the patient Y is getting out of bed, and the pressure sensor the load range of the reference load range, which is calculated from the detection value detected by 8, i.e., the patient if the distance L ₁ within one or cranial end and the foot end from the left and right ends of the air mat 2 distance L ₂ within the Y end It is determined to be in the sitting position. In the present embodiment, if the same distance L ₂ within the head-end and foot end patient Y is adapted to determine that the sitting-on-bed-edge distance and the foot side end of the head end The distance from may be set to a different value. Also, if the air mat 2 is divided into approximately three equal parts on the head side, middle and foot sides, and the ratio of the middle part to the total load calculated from the pressure distribution detected by the pressure sensor 8 exceeds the reference load ratio X ₁ %, the patient Y is determined to be in a back-up state, and if it does not exceed X ₁ %, it is determined that patient Y is in the supine position.

  The load ratio is not limited to the case where the load ratio is calculated by dividing the head ratio, the middle position, and the foot side into three sections. For example, the load ratio may be divided into four sections, and the number of sections is not particular. Moreover, it is not necessary to divide each division into equal ranges. Furthermore, the method is not limited to the method of calculating the load ratio by dividing a plurality of the air mats 2 in the longitudinal direction as described above, but the predetermined position (for example, the maximum body pressure position near the buttocks and the gravity center position of the patient Y) with respect to the entire air mat 2. The load ratio may be calculated.

  Further, the control device 5 determines whether or not the patient Y can be turned over based on the detection signal of the pressure sensor 8 and whether the patient Y has turned over or not. Body movement presence / absence determination unit 5c, determination position setting unit 5d for setting a position for determining whether or not the person has turned over, and a reference for pressure acting on the patient Y as a reference when determining that the person has turned over A change pressure setting unit 5e in which the amount of decrease in body pressure is set in advance is provided. Further, the control device 5 has a body movement time storage unit 5f for storing the time when the patient Y has been turned over by the body movement presence / absence determination unit 5c, and a reference when determining that the patient Y cannot turn over. A determination time setting unit 5g for setting a predetermined elapsed time is provided. The body movement of the present invention means turning over, and being able to move and not being able to move means that it can be turned over and cannot be turned over.

  The determination position setting unit 5d presets a predetermined position of the patient Y for determining whether to turn over or not as a determination position, and based on the pressure distribution detected by the pressure sensor 8, It is designed to specify which position on the air mat 2 the determination position is. In this embodiment, the determination position can be set in advance by selecting the position of the center of gravity of the patient Y or the maximum body pressure position. In addition, you may make it set the said determination position other than the gravity center position and the maximum body pressure position of the patient Y, and another position. The maximum body pressure position set as the determination position may be a maximum body pressure position limited to a specific region. For example, as the maximum body pressure position near the buttocks, the maximum body pressure position near another head or back You may make it distinguish from a pressure position.

Said body motion determining unit 5c compares the current position determination and time t ₁ before the determination position, the distance from the time t ₁ before the determination position to the current position determination exceeds a predetermined reference distance L ₃ If it has changed, it is determined that the patient Y has turned over. Further, the control unit 5, the distance to the current position determination from the time t ₁ before the determination position even if not vary by more than a predetermined reference distance L _3, detected by the pressure sensor 8 in the position determination If the body pressure decrease amount exceeds the reference body pressure decrease amount X ₂ % set by the change pressure setting unit 5e, it is determined that the patient Y has turned over. On the other hand, the body motion determining unit 5c, the distance to the current position determination does not satisfy a predetermined reference distance L ₃ from the time t ₁ before the determination position, and was detected by the pressure sensor 8 of the judgment position the body If the pressure decrease amount does not satisfy the reference body pressure decrease amount X ₂ % in the change pressure setting unit 5e, it is determined that the patient Y has not turned over.

The body movement determination unit 5b, from the time it is determined that the stored patient Y is rolling over in the body movement time storage unit 5f, exceeds the determination time setting unit predetermined elapsed time set in 5 g t _2, and, if it is determined that the turn in the body motion determining unit 5c when less than the elapsed time t _3, while determining that the patient Y may turn on its own, rolling over the patient Y by the body movement determining unit 5c If it is determined after the determined and was rolled over by the body motion determining unit 5c after exceeding a predetermined elapsed time t _4, the patient Y is adapted to determine that it can not turn on their own. The elapsed time is set based on empirical rules. That is, it is known from experience that a patient Y who can turn over turns during the elapsed time t _{2 to} t ₃ , while a patient Y who cannot turn over is periodically turned over by a nurse or a caregiver. but it is known from experience that exceeds the elapsed time t ₄ since the turn until the next turn, so as to determine whether it turn on its own by the decision logic based on these heuristics Yes.

  The control device 5 is provided with a body type determination unit 5h that determines the body type of the patient based on the pressure distribution detected by the pressure sensor 8.

  The body type determination unit 5h calculates the height from the pressure distribution detected by the pressure sensor 8, estimates the body weight from the calculated value calculated by multiplying the detected value detected by the pressure sensor 8 by a predetermined coefficient, and calculates these values. The body type of the patient Y is determined based on the height and weight. In the present embodiment, a range of five levels of fairly thin, thin, normal, thick, and fairly thick is set in advance, and it is determined to which range the patient Y falls. The body shape of the patient Y does not have to be five stages as described above, and any stage may be set.

The control device 5 includes a first cell 12A, a second cell 11A, a second cell 11A, each corresponding to a combination of determination results of the body movement availability determination unit 5b, the body position determination unit 5a, and the body type determination unit 5h. 11B,..., 11N and a reference pressure storage unit 5i for storing the internal pressure value _Pn of the third cell 10 are provided. The internal pressure value P _n includes an internal pressure value P _{n1 of} each of the first cells 12A and 12B, an internal pressure value P _{n2 of} the second cells 11A, 11B,..., 11N, and an internal pressure value P _n3 of the third cell 10. In this embodiment, these three combinations are set in 10 ways and stored in the reference pressure storage unit 5i. As shown in FIG. 7, the 10 combinations include pressures lower than the reference pressure N in four stages of set pressures S1 to S4, and pressures higher than the reference pressure N set at the set pressures H1 to H4. The pressure is set in five stages of H5, and is set such that the pressure decreases as the set pressure S1 changes to the set pressure S4, and the pressure increases as the set pressure H1 changes to the set pressure H5. Note that the combinations of the internal pressure values P _n1 , P _n2, and P _n3 do not have to be 10 as described above, and any number may be set.

In addition, the control device 5 is set in advance for each position of the second cells 11A, 11B,..., 11N in order to determine whether or not a predetermined high pressure value is detected by the pressure sensor 8. A pressure storage unit 5j in which the set pressure value N _max is stored is provided.

The control device 5 is configured such that the pressure in the first cell 12A, 12B, second cell 11A, 11B,..., 11N and the third cell 10 is determined by the body position determination unit 5a, the body movement availability determination unit 5b, and the above. The first cell 12A, 12B, the second cell 11A, 11B,..., 11N and the third cell 10 from the air supply / exhaust device 4 so as to have an internal pressure value P _n corresponding to the combination of the determination results of the body type determination unit 5h. The air pressure is adjusted to control the internal pressure. In the air mat 2, the pressure in the third cell 10 is set so that the patient Y does not hit the bed frame F when air escapes from the first cells 12A, 12B and the second cells 11A, 11B,. The pressure is such that the patient Y hits the bed frame F and feels that the patient Y is hard and has a light cushioning property. Therefore, when the cell internal pressure of the first cells 12A, 12B and the second cells 11A, 11B,..., 11N decreases, the patient Y comes into contact with the bed frame F and the like, and the hardness of the bed frame F is intuitive. Can be reliably prevented, and the air mat apparatus 1 with high safety for the patient Y can be obtained.

In addition, the control device 5 can control the sleeping posture of the patient Y by adjusting the air supply amount to the second cells 11A, 11B,. The technical content uses the technical content disclosed in Japanese Patent Application Laid-Open No. 2009-183490, and the control device 5 calculates the load applied to the air mat 2 from the pressure distribution detected by the pressure sensor 8, A value obtained by multiplying the calculated load by a predetermined coefficient is added to the internal pressure value P _n2 to obtain a target pressure, and the pressure in the second cells 11A, 11B,..., 11N becomes the target pressure. In addition, the air supply / discharge device 4 is controlled to control the sleeping posture of the patient Y.

  In this embodiment, the sleeping position of the patient Y on the air mat 2 is controlled by the control device 5, but the present invention can also be applied to the air mat 2 that does not control the sleeping position of the patient Y.

Further, the control device 5 can change the internal pressure between the static mode and the pressure switching mode by adjusting the air supply amount to the first cells 12A and 12B. The control device 5 in the stationary mode supplies air to the first cells 12A and 12B until the internal pressure value P _n1 is reached, and maintains the state. On the other hand, the control device 5 in the pressure switching mode supplies air to the first cells 12A and 12B until the internal pressure value P _n1 is reached, and then, as shown in FIG. 3B, the pressure in the first cell 12B. _Is maintained at the internal pressure value P _n1 , air is extracted from the first cell 12A to contract the first cell 12A, and the state is maintained for a predetermined time. Then, as shown in FIG. Air is supplied to 12A until the internal pressure value P _n1 is _reached, and the internal pressure is controlled by adjusting the air supply / discharge device 4 so as to repeat the operation of drawing the air from the first cell 12B and contracting the first cell 12B. It is like that. That is, the control device 5 repeats the air supply / exhaust device 4 so that the internal pressure of the two adjacent first cells 12A and 12B alternately decreases and increases, so that when one is decreasing, the other is increasing. The internal pressure is controlled by adjusting. The stationary mode and the pressure switching mode are controlled so that the pressure switching mode is automatically set after the initial setting. However, the operation panel can be switched to the stationary mode according to the individual situation of the patient Y. 6 can be switched manually.

Further, in the pressure switching mode, the control device 5 switches between a pressure fluctuation emphasis mode for shortening a predetermined time during which the first cells 12A and 12B are expanded or contracted and a stability emphasis mode for increasing the predetermined time. It is supposed to be. The expansion or contraction mode of the first cells 12A and 12B is not limited to the pressure fluctuation emphasis mode and the stability emphasis mode. For example, the first cells 12A and 12B are expanded or contracted several times during a predetermined time. The mode may be such that the predetermined time during which the first cells 12A and 12B are expanded or contracted is lengthened several times. Further, every time when the cell expands or contracts, the predetermined time during expansion or contraction is changed, the internal pressure value P _n1 in the first cells 12A and 12B is changed, or when the first cells 12A and 12B contract A mode in which the internal pressure value is changed may be used.

Further, when the detected value of the pressure sensor 8 exceeds the pressure set value N _max stored in the pressure storage unit 5j, one of the two adjacent first cells 12A and 12B is in an increased state or the control device 5 The second cells 11A, 11B,... That are in a position exceeding the pressure set value N _max except for the stable state in which the decreased state is maintained, that is, the state in which the first cells 12A, 12B are changing. The air supply / exhaust device 4 is controlled so that the decrease / increase of the internal pressure of 11N is repeated as time passes. In addition, when 2nd cell 11A-11N straddles 3 or more cells of the 1st cell group 12, the control apparatus 5 is 2nd cell 11A, 11B in the position exceeding the said pressure setting value _Nmax , ..., while at least one of the plurality of cells of the first cell group 12 corresponding to 11N is maintaining the increased state, the second cells 11A, 11B, ... located at positions exceeding the pressure set value _Nmax . The air supply / exhaust device 4 is controlled so that the decrease / increase of the internal pressure of 11N is repeated as time passes.

In FIG. 5, the horizontal axis represents time, and the vertical axis represents the first cells 12A, 12B and second cells when the air supply amount to the first cells 12A, 12B and the second cells 11A, 11B,. 11A, 11B,..., 11N are graphs showing the pressure values in the second cell 11A with respect to the operation of the first cells 12A, 12B when the detected value of the pressure sensor 8 exceeds the pressure set value _Nmax . The operation timing of 11B,..., 11N is shown. D1 is data of the first cell 12A, D2 is data of the first cell 12B, D3 is data of the second cells 11A, 11C, 11E,..., 11M, and D4 is data of the second cells 11B, 11D. , 11F,..., 11N, and the pressure value detected by the pressure sensor 8 is set at the position of two adjacent cells in the second cell group 11 (for example, the second cells 11C and 11D shown in FIG. 6). The operation when the value N _max is exceeded is shown. Further, in the pattern A in the figure, every time the switching of the decrease / increase of the first cell 12A and the first cell 12B is performed once, two adjacent second cells 11A, 11B,. The pattern B shown in FIG. 1 is contracted each time, and each time the switching between the decrease / increase of the first cell 12A and the first cell 12B is performed three times, two adjacent second cells 11A, 11B,. , 11N alternately contract once each time.

  Note that an operator such as a caregiver or a nurse can change the pattern A and the pattern B according to the state of the patient Y by operating the operation panel 6.

  Further, the pattern in which the first cell 12A and the first cell 12B are alternately decreased / increased is not limited to the above-described pattern, and may be another pattern. For example, each time the switching of the decrease / increase of the first cell 12A and the first cell 12B is performed once, one of the second cells 11A, 11B,..., 11N may contract once. , 11N of the second cells 11A, 11B,..., 11N may alternately contract once each.

  Alternatively, pattern B may be repeated several times after pattern A is repeated several times.

  Furthermore, the pattern may be changed according to the state of the patient Y (whether body movement is possible, the body shape is different, etc.).

  Next, a specific control operation in the automatic operation of the air mat device 1 will be described based on a flowchart shown in FIG.

First, the power of the control box 3 is turned on, and the operator operates the operation panel 6, for example, the internal pressure value P in the first cell 12A, 12B, the second cell 11A, 11B,. _n1 , _Pn2 , _Pn3, etc. are set.

Thereafter, the process proceeds to step SA1 in the flowchart of FIG. In step SA1, the control device 5 operates the electromagnetic valve 44 to change the position of the valve body, and the piping 20 connected to the third cells 10, 10... The second air pump 48 is activated. As a result, air is supplied to the third cell 10. During this time, the pressure in the third cell 10 is detected by the third air pressure sensor 49, and when the internal pressure value P _n3 of the reference pressure N is reached, the position of the valve body is changed to the third cell 10 The pipe 20 to be connected is closed.

Next, the control device 5 changes the position of the valve body of the distribution valve 42, and connects the piping 22 </ b> A connected to the first cell 12 </ b> A and the discharge pipe 46 of the first air pump 41 to communicate with the first air pump 41. By operating the, air is supplied to the first cell 12A. Air is similarly supplied to the first cell 12B. The first cells 12A and 12B are maintained in a state set to the internal pressure value P _n1 of the reference pressure N.

After that, the control device 5 changes the position of the valve body of the electromagnetic valve 44, and connects the pipe 21A connected to the second cell 11A and the second air pump 48 so that the internal pressure value P _{n2 of the} reference pressure N is _reached. The air supply / discharge device 4 is controlled so as to supply air to the second cell 11A until In this way, after supplying air to the second cells 11A, 11B,..., 11N in order, the process proceeds to step SA2.

  In step SA2, a pressure distribution as shown in FIG. 6 is displayed on the operation panel 6 based on the detection value of the pressure sensor 8. Then, the process proceeds to step SA3, where the posture determination process is started.

  Here, a specific control operation of the body posture determination process in step SA2 will be described based on the flowchart shown in FIG.

  First, in step SB1, the weight is calculated by multiplying the detection value detected by the pressure sensor 8 by a predetermined coefficient.

  Next, in step SB2, it is determined whether or not the weight calculated in step SB1 exceeds a predetermined reference weight W input by each switch of the operation panel 6. When the determination in step SB2 is NO, that is, when it is determined that the calculated weight does not exceed the reference weight W, the process proceeds to step SB3, and the process is terminated assuming that the patient Y is getting out of bed.

On the other hand, if the determination in step SB2 is YES, in step SB4, whether pressure distribution detected by the pressure sensor 8 is within the reference load range, i.e., the distance L ₁ within the left and right ends of the air mat 2 or to determine whether it is within a distance L ₂ from the head end and a foot end.

When the judgment at step SB4 is YES, that is, when the pressure distribution detected by the pressure sensor 8 is within a distance L ₂ from the distance L ₁ within one or cranial end and the foot end from the left and right ends of the air mat 2, Proceeding to step SB5, it is concluded that the patient Y is in the end sitting position.

On the other hand, when the determination in step SB4 is NO, the process proceeds to step SB6, and it is determined whether or not the intermediate ratio exceeds the reference load ratio X ₁ %.

When the determination in step SB6 is YES, that is, when the intermediate ratio exceeds the reference load ratio X ₁ %, the process proceeds to step SB7, and the process ends with the patient Y being in the back-up state.

  On the other hand, when the determination in step SB6 is NO, the process proceeds to step SB8, and the process is terminated assuming that the patient Y is in the supine position.

  When the body position determination process is completed and the determination in step SA3 is NO, that is, if it is determined that the patient Y is getting out of bed, is in the end-sitting position, and is in the back-up state, the process proceeds to step SA6, and body movement described later is performed. Judgment processing is performed.

  On the other hand, when the determination in step SA3 is YES, that is, when it is determined that the patient Y is in the supine position, the process proceeds to step SA4, the height of the patient Y is calculated from the pressure distribution of the pressure sensor 8, and the pressure sensor 8 The value calculated by multiplying the detected value detected in step 2 by a predetermined coefficient is estimated as the weight of the patient Y, and the process proceeds to step SA5.

  In step SA5, the body type of patient Y is set based on the height and weight calculated in step SA4. In the present embodiment, a range of five levels, which are fairly thin, thin, normal, thick, and fairly thick, is set in advance, and the body shape determination unit 5h determines which body shape the patient Y is.

  And it progresses to following step SA6 and a body movement determination process is started. Here, a specific control operation of the body movement determination process in step SA6 will be described based on the flowchart shown in FIG.

  First, in step SC1, the determination position for body movement determination is selected as either the center of gravity position of the patient Y or the maximum body pressure position.

  Next, in step SC2, the determination position is specified on the air mat 2 based on the pressure distribution detected by the pressure sensor 8, and the process proceeds to step SC3.

At step SC3, and compares the current position determination and time t ₁ before the position determination, whether the distance from time t ₁ before the determination position to the current position determination is changed by more than a predetermined reference distance L ₃ Determine. When the judgment at Step SC3 is YES, that is, when it is determined from the time t ₁ before the determination position and the distance to the current determination position is changed by more than a reference distance L ₃ proceeds to step SC5, the patient Y The process proceeds to step SC7 because it is turned over.

On the other hand, when the determination in Step SC3 is NO, that is, when it is determined from the time t ₁ before the determination position and the distance to the current position determination is not changed by more than a reference distance L _3, the process proceeds to step SC4 The body pressure decrease amount of the pressure sensor 8 detected at the determination position is compared with the reference body pressure decrease amount X ₂ % set by the change pressure setting unit 5e.

When the determination in step SC4 is YES, that is, when it is determined that the amount of decrease in body pressure detected by the pressure sensor 8 exceeds the reference amount of decrease in body pressure X ₂ %, the process proceeds to step SC5 and step Y is performed assuming that the patient Y has turned over. Proceed to SC7.

  On the other hand, when the determination in step SC4 is NO, the process proceeds to step SC6, and the process proceeds to step SC8 on the assumption that the patient Y has not turned over.

In step SC7, it is determined whether or not the patient Y is turned up within a predetermined time from the time when it was previously determined that the patient Y stored in the body movement time storage unit 5f turned up. When the judgment at Step SC7 is NO, that, rolling over time has exceeded a predetermined elapsed time t ₂ from turning over the last time, and, if not less than the elapsed time t _3, the process returns to step SC1.

  On the other hand, if the determination in step SC7 is YES, it is determined that the patient Y can turn over in step SC9, the process proceeds to step SC11, and the pressure switching mode is set to the stability-oriented mode and the process is terminated.

At Step SC8, it determines whether the elapsed time is not rolling over exceeds t _4. When the judgment at Step SC8 is NO, that, if the elapsed time does not turn exceeds t _4, the process returns to step SC1.

  On the other hand, when the determination in step SC8 is YES, the process proceeds to step SC10, where it is determined that the patient Y cannot turn over, and the process proceeds to step SC12, in which the pressure switching mode is set to the pressure fluctuation emphasis mode and the process ends.

When the determination in step SA6 is YES, that is, when it is determined that the patient Y can turn over, the process proceeds to step SA7, and the first cells 12A, 12B, the second cells 11A, 11B,. After the air supply / discharge device 4 is controlled so as to be the internal pressure value P _n of the reference pressure N, the process proceeds to step SA8.

  On the other hand, if the determination in step SA6 is NO, that is, if it is determined that patient Y cannot turn over, the process proceeds to step SA8.

In step SA8, the first cells 12A, 12B, the second cells 11A, 11B,..., 11N and the set pressures corresponding to the determination results of the body position determination unit 5a, body movement availability determination unit 5b, and body type determination unit 5h The internal pressure of the 3 cell 10 is set. In the present embodiment, the internal pressures of the first cells 12A, 12B, the second cells 11A, 11B,..., 11N and the third cell 10 are set based on the table shown in FIG. Based on any value of the pressure N, the internal pressure values P _n1 , P _n2 and P _n3 are set.

Thereafter, the process proceeds to step SA9 to control the sleeping posture for the patient Y on the air mat 2. The control device 5 calculates a load applied to the air mat 2 from the pressure distribution detected by the pressure sensor 8, and adds the calculated load multiplied by a predetermined coefficient to the internal pressure value _Pn2 as a target pressure. . And the said control apparatus 5 controls the air supply / discharge apparatus 4 so that said 2nd cell 11A, 11B, ..., 11N may become the said target pressure.

  Thereafter, the process proceeds to step SA10, and the control device 5 controls the pressure switching mode for the patient Y on the air mat 2. First, as shown in FIGS. 3B and 3C, the control device 5 reduces the air supply amount into the first cell 12A while maintaining the pressure in the first cell 12B at a predetermined value. Reduce pressure. After a predetermined time has passed in this state, the air supply amount into the first cell 12A is increased to increase the pressure to the same pressure as the predetermined value of the first cell 12B, and the air supply amount to the first cell 12B is decreased. To reduce the pressure. By repeating this, it is possible to prevent the same pressure from being applied to each part of the body of the patient Y for a long time, thereby suppressing bed slip.

Thereafter, the process proceeds to step SA11, and it is determined from the detection value of the pressure sensor 8 whether or not a high pressure is applied to the patient Y. When the determination in step SA11 is NO, that is, when the detected value of the pressure sensor 8 does not exceed the pressure set value _Nmax , the process returns to step SA2.

On the other hand, when the determination in step SA11 is YES, that is, if the detected value of the pressure sensor 8 exceeds the pressure set value _Nmax , the process proceeds to step SA12 to determine whether or not the patient Y can lie down. The determination at step SA12 uses the determination result made at step SA6. When the determination is YES, that is, when the patient Y can turn over, the process proceeds to step SA14 to perform partial pressure switching control. Return to SA2.

  On the other hand, when the determination in step SA12 is NO, that is, when the patient Y cannot turn over, the process proceeds to step SA13, and the first cell 12A, 12B, the second cell 11A, 11B,. It is determined whether or not the set pressure in 10 is a set pressure lowered by one step with respect to the set pressure set in step SA8. When the determination in step SA13 is NO, that is, when the set pressures of the first cells 12A, 12B, the second cells 11A, 11B,..., 11N and the third cell 10 are the set pressures set in step SA8. Decreases the set pressure by one step and returns to step SA2. In the present embodiment, for example, when the set pressure in step SA8 is H5, if the pressure is not changed to H4, the process returns to step SA2.

  On the other hand, when the determination in step SA13 is YES, that is, the set pressures of the first cells 12A, 12B, the second cells 11A, 11B,..., 11N and the third cell 10 are one step higher than the set pressure set in step SA8. When the set pressure is lowered, the process proceeds to Step SA14, performs partial pressure switching control, and returns to Step SA2.

In step SA14, partial pressure switching control is performed. Specifically, the air supply amount to each cell of the second cell group 11 corresponding to the location where a high pressure is applied to the patient Y is periodically decreased and increased according to the detection value of the pressure sensor 8. For example, when the portion De in FIG. 6 exceeds the pressure set value N _max preset in the second cell 11D, the air supply amount to the second cell 11D is decreased to reduce the pressure, and a predetermined time has elapsed in this state. After that, the air supply amount to the second cell 11D is increased to increase the pressure. In the present embodiment, when the first cells 12A and 12B are in the pressure switching mode, when the air supply amount in the second cell 11D is decreasing, the two first cells straddling the second cell 11D are used. One of the cells 12A and 12B is configured such that the air supply amount does not decrease. Therefore, it is possible to avoid a part of the body of the patient Y from sinking deeply, and it is possible to prevent the sleeping posture of the patient Y from being collapsed while effectively suppressing the occurrence of bedsores and pain.

  As described above, according to the embodiment of the present invention, when a high pressure is applied to the pressure sensor 8, the cell internal pressures of the second cells 11A, 11B,. Therefore, since the high pressure is not continuously applied to the location, it is possible to suppress the bed slip and pain of the patient Y. And, since the amount of air supplied into the second cells 11A, 11B,..., 11N corresponding to the part is not reduced, a part of the body of the patient Y corresponding to the part remains depressed. It is not maintained, and comfort can be maintained high without destroying the sleeping posture of the patient Y. In addition, by decreasing / increasing the cell internal pressure of the second cells 11A, 11B,..., 11N corresponding to the location with time, the vein, artery, lymph, etc. at the location are repeatedly released and pressed. Thus, the circulation of venous blood and lymph is promoted, and the blood flow can be improved by increasing the inflow of arterial blood.

  Further, by repeating the decrease / increase of the first cells 12A, 12B, it is possible to relieve the pressure on the blood vessels of the entire body of the patient Y on the air mat 2 and suppress the occurrence of bed slip and pain. In addition, it is possible to prevent the blood vessel from being further compressed using the second cells 11A, 11B,..., 11N, particularly where high pressure is detected by the pressure sensor 8.

In addition, since the pressure acting on the patient Y on the air mat 2 can be directly transmitted to the pressure sensor 8 and precise pressure measurement is possible, the second cell 11A at an accurate position corresponding to a location where the pressure is high, It is possible to control the internal pressures of 11B,..., 11N. Further, since the first cells 12A, 12B can be controlled by only two piping systems, the air mat device 1 with a simple configuration can be obtained.

  In addition, since the air mat is changed to an optimum hardness according to the posture of the patient Y on the air mat 2, the comfort is not impaired regardless of the posture of the patient Y on the air mat 2.

  Further, since the patient Y just lies on the air mat 2 (just lies on his back), the height, weight, etc. of the patient Y on the air mat 2 are automatically estimated based on the pressure distribution detected by the pressure sensor 8. Caregivers and the like can save the trouble of inputting these set values in advance for each patient Y, thereby improving workability and preventing operation errors.

  In addition, the patient Y can be automatically placed on the air mat 2 by the pressure distribution detected by the pressure sensor 8 to automatically determine the posture of the patient Y, i.e., getting out of bed, sitting on the edge, raising the back, supine, etc. Since it is possible to determine whether or not the patient Y can turn over by himself / herself, the trouble of inputting these determinations for each patient Y can be saved, so that workability can be improved and an operation error can be prevented.

  In addition, the control device 5 automatically determines whether the patient Y is on the air mat 2, that is, the posture and body shape of the patient Y, and whether the patient can be turned over. Since the air supply / discharge device 4 is controlled so as to have the optimum hardness, the air mat device 1 can be made easy to use and can reduce the burden of care for the patient Y on the air mat 2 such as a nurse or a caregiver.

  As described above, the mat device according to the present invention can be used in, for example, a medical facility or a nursing facility.

DESCRIPTION OF SYMBOLS 1 Air mat apparatus 2 Air mat 3 Control box 4 Air supply / discharge apparatus 5 Control apparatus 5a Position determination part 5j Pressure memory part 8 Pressure sensor 10 3rd cell group 11 2nd cell group 12 1st cell group

Claims (5)

An air mat in which a plurality of independent cells are juxtaposed in the height direction at the time of the patient's sleeping posture, a pressure sensor that detects a pressure distribution acting between each cell and the patient, and is connected to each cell, An air mat device provided with an air supply / discharge device for supplying and discharging air to and from each cell,
When the pressure sensor is connected to the pressure sensor and the air supply / exhaust device and stores a preset pressure set value for each cell, the detected value of the pressure sensor exceeds the set pressure value A control device for controlling the air supply / exhaust device so as to repeat the decrease / increase of the cell internal pressure as time passes ,
The air mat includes a first cell group in which a plurality of cells are arranged in a row on the front side, and a plurality of cells arranged in a row along the first cell group on the lower side of the first cell group. With two cell groups,
Each cell of the second cell group is correspondingly arranged so as to straddle a plurality of cells of the first cell group,
The control device controls the air supply / exhaust device so that the internal pressure of each cell of the first cell group repeatedly decreases and increases, and the detection value of the pressure sensor is previously determined for each cell of the second cell group. When the set pressure set value is exceeded, the pressure set value is set while at least one internal pressure of the plurality of cells of the first cell group corresponding to the cell exceeding the set pressure value is maintained in an increased state. An air mat device for controlling the air supply / exhaust device so as to repeat the decrease / increase of the internal pressure of the cells of the second cell group that have exceeded with the passage of time . The air mat device according to claim 1,
Each cell of the second cell group is arranged correspondingly so as to straddle two adjacent cells of the first cell group,
The control device includes the air supply / exhaust device so that the internal pressure of two adjacent cells in the first cell group repeatedly decreases and increases alternately so that when one of the internal pressures is decreasing, the other internal pressure is increasing. And when the detected value of the pressure sensor exceeds a preset pressure value for each cell of the second cell group, the internal pressure of one of the two adjacent cells of the first cell group increases. The air supply / exhaust device is controlled to repeat the decrease / increase of the internal pressure of the cells of the second cell group exceeding the pressure set value as time passes while maintaining the state. Air mat device. In the air mat device according to claim 1 or 2 ,
The air mat device according to claim 1, wherein the pressure sensor is disposed on each cell of the first cell group. In the air mat device according to any one of claims 1 to 3 ,
The air mat includes a third cell group arranged in a line along the second cell group below the second cell group,
The air mat device according to claim 1, wherein the control device controls the air supply / discharge device so that the pressure in each cell of the third cell group is maintained at a predetermined value or more. In the air mat device according to any one of claims 1 to 4 ,
The pressure storage unit also stores an internal pressure value set in advance for each cell corresponding to each posture of the patient,
The control device includes a posture determination unit that determines each posture of the patient based on the pressure distribution of the pressure sensor, and the pressure in each cell is stored in the pressure storage unit based on the determination result of the posture determination unit. An air mat apparatus for controlling the air supply / exhaust device so as to have a stored internal pressure value.