Air mattress

Abstract

We offer user-friendly air mattresses. [Solution] An air mattress comprising a plurality of air cells arranged in the front-to-back direction, a mattress control unit that controls the internal pressure of the plurality of air cells, and a mattress operating unit that is operated to change the internal pressure of the plurality of air cells, wherein the mattress control unit has a gap mode that creates a gap between the user on the air cells and the air cells based on the operation of the mattress operating unit.

Description

Technical Field

[0001] Embodiments of the present invention relate to an air mattress.

Background Art

[0002] An air mattress that supplies air to and discharges air from a plurality of air cells to prevent bedsores of a user on the mattress is known (Patent Document 1).

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] The problem to be solved by the present invention is to provide a user-friendly air mattress.

Means for Solving the Problems

[0005] The air mattress according to the embodiment includes a plurality of air cells arranged in the front-rear direction, a mattress control unit that controls the internal pressure of the plurality of air cells, and a mattress operation unit that is operated to change the internal pressure of the plurality of air cells. The mattress control unit has a gap mode in which a gap is formed between the user on the air cell and the air cell based on the operation of the mattress operation unit.

Effects of the Invention

[0006] According to the embodiment of the present invention, a user-friendly air mattress can be provided.

Brief Description of the Drawings

[0007] [Figure 1]This is a side view showing an electric bed unit equipped with an air mattress according to the first embodiment of the present invention. [Figure 2] This is a control system cylinder for an electric bed unit. [Figure 3] This is the control system block for the air mattress. [Figure 4] This is an explanatory diagram showing the air supply and exhaust system of an air mattress. [Figure 5] This flowchart illustrates the gap mode control process performed by the mattress control unit. [Figure 6] This is an explanatory diagram showing the process of inserting a cloth sheet between the user's back and the air cell. [Figure 7] This is an explanatory diagram showing the process of inserting a cloth sheet between the user's buttocks and the air cell. [Figure 8] This is an explanatory diagram showing the process of inserting a cloth sheet between the user's thigh and the air cell. [Figure 9] This is a plan view showing the state in which a cloth sheet is inserted between the user and the air cell. [Figure 10] This is a flowchart showing the pillow-holding mode control process of an air mattress according to a second embodiment of the present invention. [Figure 11] This is an explanatory diagram showing the state of the air cells when the bottom is flat. [Figure 12] This is an explanatory diagram showing the state of the air cells when the back bottom is upright. [Figure 13] This is an explanatory diagram showing a sloping bottom. [Figure 14] This is a flowchart showing the pillow height mode control process for an air mattress according to a third embodiment of the present invention. [Figure 15] This is an explanatory diagram showing an air mattress according to a fourth embodiment of the present invention. [Modes for carrying out the invention]

[0008] An air mattress according to an embodiment of the present invention will be described with reference to FIGS. 1 to 15. FIGS. 1 to 9 show an air mattress according to the first embodiment.

[0009] FIG. 1 is a side view showing an electric bed unit provided with an air mattress according to the first embodiment of the present invention. FIG. 2 is a block diagram showing a control system of the electric bed unit.

[0010] The electric bed unit 10 shown in FIG. 1 is used, for example, in a nursing facility, a hospital, and a private home, and can electrically raise and lower the backrest and knees, etc., and the height of the bed 20 can be electrically operated. The electric bed unit 10 shown in FIG. 1 is shown in a simplified manner, omitting the drive devices for raising and lowering the backrest and knees, etc., and changing the height of the bed 20. In the embodiment, the head side of the user H lying on the bed 20 is described as the front side, and the foot side is described as the rear side. The electric bed unit 10 includes a bed 20 and an air mattress 50 provided on the bed 20.

[0011] The bed 20 has a base frame 21 placed on the floor surface F, a main frame 22 located above the base frame 21, and a bottom 23 that can be raised and lowered with respect to the main frame 22. Two main frames 22 are provided at intervals in the left-right direction (lateral direction) of the bed 20 and extend in the front-rear direction. The main frame 22 is supported by the base frame 21 via, for example, a lifting mechanism 25. The main frame 22 can be moved vertically with respect to the base frame 21 by a third drive device 33 described later.

[0012] The upper surface of the bottom 23 is the placement surface of the mattress 52. As shown in FIG. 1, the bottom 23 supports the user H via the mattress 52. The bottom 23 has a back bottom 23a, a waist bottom 23b, a knee bottom 23c, and a leg bottom 23d.

[0013] The back bottom 23a supports the head or back of the user H lying on the bed 20. The back bottom 23a can be raised and lowered by a first drive device 31 described later. The lumbar bottom 23b is located behind the back bottom 23a. The lumbar bottom 23b supports the waist or buttocks of the user H lying on the bed 20.

[0014] The knee bottom 23c is located behind the lumbar bottom 23b. The knee bottom 23c supports the thigh of the user H lying on the bed 20. The leg bottom 23d is located behind the knee bottom 23c. The leg bottom 23d supports the lower leg of the user H lying on the bed 20. The knee bottom 23c and the leg bottom 23d can be raised and lowered by a second drive device 33 described later.

[0015] Below the bottom 23, there are provided a backrest mechanism (not shown) for raising and lowering the back bottom 23a, a knee-lifting mechanism (not shown) for raising and lowering the knee bottom 23c and the leg bottom 23d, a lifting mechanism 25 for raising and lowering the main frame 22 and the bottom 23, and a bed control unit 39 for controlling the operation of each mechanism.

[0016] The backrest mechanism, the knee-lifting mechanism, and the lifting mechanism 25 are operated by a drive device such as an electric cylinder. The backrest mechanism raises and lowers the back bottom 23a by the operation of the first drive device 31. The knee-lifting mechanism bends the knee bottom 23c and the leg bottom 23d in a mountain-fold shape by the operation of the second drive device 32. The lifting mechanism 25 raises and lowers the main frame 22 and the bottom 23 by the operation of the third drive device 33. Thereby, the height from the floor surface F to the bottom 23 of the bed 20 is adjusted. Note that the bed 20 may have a mechanism for tilting the entire bottom 23. The bed 20 may have a tilt mechanism for raising the front end side with the rear end side as a fulcrum, as shown in FIG. 13 described later, for example.

[0017] The bed control unit 35 is a remote control for operating the first drive unit 31, the second drive unit 32, and the third drive unit 33. The bed control unit 35 is connected to the bed control unit 39 by wire or wireless connection. By operating the bed control unit 35, the user H or caregiver can raise and lower the back bottom 23a, knee bottom 23c, and leg bottom 23d, and change the height of the bed 20 from the floor surface F.

[0018] The bed control unit 35 includes, for example, a back-raising button 35a, a back-lowering button 35b, a leg-raising button 35c, a leg-lowering button 35d, an upward button 35e, and a downward button 35f. Note that each control button may be a touch panel or the like. The bed control unit 35 may also have a display unit that shows the status of the bed 20.

[0019] The backrest raising button 35a and backrest lowering button 35b are for operating the first drive unit 31. The backrest raising button 35a is operated to extend the rod of the first drive unit 31 and raise the backrest bottom 23a. The backrest lowering button 35b is operated to retract the rod of the first drive unit 31 and lower the backrest bottom 23a.

[0020] The leg-raising button 35c and leg-lowering button 35d are for activating the second drive unit 32. The leg-raising button 35c is operated to extend the rod of the second drive unit 32, thereby raising the knee bottom 23c and leg bottom 23d. The leg-lowering button 35d is operated to retract the rod of the second drive unit 32, thereby lowering the knee bottom 23c and leg bottom 23d.

[0021] The up button 35e and the down button 35f are for operating the third drive unit 33. The up button 35e is operated to extend the rod of the third drive unit 33 and raise the height of the bottom 23. The down button 35f is operated to retract the rod of the third drive unit 33 and lower the height of the bottom 23.

[0022] The angle sensor 37 detects the tilt angle of the back bottom 23a with respect to the horizontal direction. The angle sensor 37 also detects the tilt angle of the back bottom 23a with respect to the waist bottom 23b, for example. Alternatively, the angle sensor 37 may detect the tilt angle of the back bottom 23a with respect to the horizontal direction when the bottom 23 of the bed 20 is tilted up. The angle sensor 37 transmits the detected result to the bed control unit 39.

[0023] The bed control unit 39 is located, for example, below the bottom 23. The bed control unit 39 is connected to the bed operating unit 35. Based on the operation of the bed operating unit 35, the bed control unit 39 controls the operation of the first to third drive units 31 to 33.

[0024] The bed control unit 39 has a memory unit 39a. The memory unit 39a stores programs for operating the first to third drive units 31 to 33. The bed control unit 39 operates the first to third drive units 31 to 33 based on command signals transmitted from the bed operation unit 35. The bed control unit 39 also transmits command signals to the mattress control unit 83, which will be described later, based on the detection results of the angle sensor 37.

[0025] Figure 3 is a block diagram showing the control system of the air mattress. Figure 4 is an explanatory diagram showing the air supply and exhaust system of an air mattress.

[0026] The air mattress 50 comprises a mattress 52 that supports the user H, a mattress control unit 83, and a mattress operating unit 85. The mattress 52 has a plurality of air cells 55 arranged in the front-to-back and up-to-down directions. One air cell 55 extends, for example, in the left-to-right direction (width direction) of the bottom 23. In this example, 24 air cells 55 are arranged in the front-to-back direction. In this example, two air cells 55 are also arranged in the up-to-down direction.

[0027] The air mattress 50 can be adjusted to the user H's preferred firmness by controlling the internal pressure of multiple air cells 55. In this example, the air mattress 50 is described as being installed on a bed 20. However, the air mattress 50 may also be used by placing the mattress 52 directly on the floor F.

[0028] The mattress 52 comprises an upper mattress 60 and a lower mattress 70 located below the upper mattress 60. The upper mattress 60 is used to distribute the body pressure of the user H in a body pressure mode described later. The lower mattress 70 is used to create a gap between the user H and the upper mattress 60 (air cell 55) in a gap mode described later.

[0029] The upper mattress 60 has multiple air cells 55 arranged in the front-to-back direction. The multiple air cells 55 of the upper mattress 60 are classified into three groups: a first air cell group 61, a second air cell group 62, and a third air cell group 63.

[0030] As shown in Figure 4, the first air cell group 61 consists of air cells 55 labeled "1". The second air cell group 62 consists of air cells 55 labeled "2". The third air cell group 63 consists of air cells 55 labeled "3". The air cells 55 in each group have the same intake and exhaust system. That is, air cells 55 with the same number perform the same internal pressure control.

[0031] In this example, the air cells 55 of the upper mattress 60 are arranged in the order "1", "2", "3", "1" from the front (head side), but the order of the air cells 55 of the upper mattress 60 is not limited to this. The arrangement of the air cells 55, which are supplied and vented together, is arbitrary and does not need to be in a regular order. Each group of air cells in the upper mattress 60 is classified, for example, to efficiently distribute the user H's comfort and body pressure. Also, in this example, the upper mattress 60 is classified into three groups, but it may be classified into two groups or four or more groups.

[0032] The lower mattress 70 has a plurality of air cells 55 arranged in the front-to-back direction. The plurality of air cells 55 of the lower mattress 70 are classified into six systems: a head air cell band 71, a shoulder air cell band 72, a back air cell band 73, a buttock air cell band 74, a thigh air cell band 75, and a lower leg air cell band 76. The first air cell band, second air cell band, and third air cell band of the present invention consist of any three of the head air cell band 71, shoulder air cell band 72, back air cell band 73, buttock air cell band 74, thigh air cell band 75, and lower leg air cell band 76.

[0033] As shown in Figure 4, the head air cell band 71 consists of air cells 55 labeled "A". The shoulder air cell band 72 consists of air cells 55 labeled "B". The back air cell band 73 consists of air cells 55 labeled "C". The buttock air cell band 74 consists of air cells 55 labeled "D". The thigh air cell band 75 consists of air cells 55 labeled "E". The lower leg air cell band 76 consists of air cells 55 labeled "F". The air cells 55 in each band have the same intake and exhaust system. That is, air cells 55 with the same number perform the same internal pressure control.

[0034] The lower mattress 70 is composed of adjacent air cells 55 forming a single band. In other words, the lower mattress 70 is composed of air cell bands that correspond to the body of user H lying on the mattress 52. The number of air cells 55 in each band is arbitrary. For example, in this example, three air cells 55 make up the head air cell band 71, but the three air cells 55 could also be combined into one. Also, in this example, the lower mattress 70 is classified into six bands, but it is sufficient for it to be classified into at least three bands.

[0035] The pump unit 80 is mounted, for example, below the bottom 23 of the bed 20. The pump unit 80 controls the firmness of each air cell 55 of the air mattress 50 by supplying and exhausting air to and from each air cell 55. The pump unit 80 includes a blower unit 81, a solenoid valve unit 82, and a mattress control unit 83.

[0036] The air blower 81 supplies air to the upper mattress 60 and the lower mattress 70. Specifically, the air blower 81 supplies air to each air cell group 61-63 of the upper mattress 60 and each air cell zone 71-76 of the lower mattress 70 via the solenoid valve unit 82. The operation of the air blower 81 is controlled by the mattress control unit 83.

[0037] The solenoid valve unit 82 is located between the upper mattress 60 and the lower mattress 70 and the air blower 81. The solenoid valve unit 82 has multiple solenoid valves. Each solenoid valve is provided corresponding to each air cell group 61-63 and each air cell zone 71-76. That is, the same solenoid valve is used for air cell zones that are controlled in common. The solenoid valve unit 82 also has an exhaust valve that exhausts the air inside each air cell 55 to the outside.

[0038] When the solenoid valve is open and the blower unit 81 is operating, air from the blower unit 81 is supplied to each air cell 55. Also, when the solenoid valve and exhaust valve are open and the blower unit 81 is stopped, the air in each air cell 55 is exhausted. The opening and closing operation of each solenoid valve and exhaust valve is controlled by the mattress control unit 83.

[0039] The mattress control unit 83 controls the firmness of the mattress 52 by changing the internal pressure of each air cell group 61-63 and each air cell zone 71-76. The mattress control unit 83 has a storage unit 83a which stores a control program for controlling the internal pressure of each air cell group 61-63 and each air cell zone 71-76. The mattress control unit 83 controls the operation of the air blower unit 81 and the solenoid valve unit 82.

[0040] The mattress control unit 83 is connected to the mattress operation unit 85, which will be described later, and controls the operation of the air blower unit 81 and the opening and closing operation of the solenoid valve unit 82 based on command signals from the mattress operation unit 85. The storage unit 83a stores, for example, a control program based on command signals from the mattress operation unit 85.

[0041] Furthermore, the mattress control unit 83 controls the operation of the blower unit 81 and the opening and closing operation of the solenoid valve unit 82 based on command signals transmitted from the bed control unit 39. The command signals transmitted from the bed control unit 39 are, for example, based on the detected value of the angle sensor 37. The storage unit 83a stores, for example, a control program based on the command signals from the bed control unit 39. For example, if the angle sensor 37 detects an angle greater than or equal to a predetermined angle, the mattress control unit 83 reduces the internal pressure of the air cell 55.

[0042] The mattress control unit 83 acquires the detection value of an air pressure sensor 84 installed in the pipeline connecting the air blower unit 81 and the solenoid valve unit 82. The air pressure sensor 84 detects the internal pressure of each air cell group 61-63 and each air cell zone 71-76 by detecting the internal pressure of the pipeline. Based on the detection value of the air pressure sensor 84, the mattress control unit 83 controls the operation of the air blower unit 81 and the opening and closing operation of each solenoid valve of the solenoid valve unit 82.

[0043] The mattress control unit 83 has a body pressure mode that distributes the body pressure of the user H on the mattress 52, and a gap mode that creates a gap between the user H on the mattress 52 and the mattress 52. The storage unit 83a stores control programs for the body pressure mode and the gap mode. The body pressure mode and gap mode will be explained in detail later. In this example, the bed control unit 39 and the mattress control unit 83 are described as separate control units, but the bed control unit 39 and the mattress control unit 83 may be a single control unit.

[0044] The mattress control unit 85 is a remote control operated to change the internal pressure of multiple air cells 55. The mattress control unit 85 is connected to the mattress control unit 83 by wire or wireless connection. By operating the mattress control unit 85, the user H or caregiver can change the internal pressure (hardness) of each air cell group 61-63 and each air cell zone 71-76.

[0045] The mattress operation unit 85 includes a body pressure mode button 85a, which is operated to cause the mattress control unit 83 to execute the body pressure mode, and a gap mode button 85b, which is operated to cause the mattress control unit 83 to execute the gap mode. Each operation button may be a touch panel or the like. The mattress operation unit 85 may also have a display unit that shows the status of the upper mattress 60 and the lower mattress 70.

[0046] The body pressure sensor 86 is installed on the mattress 52. The body pressure sensor 86 detects the position of user H on the mattress 52 and the sleeping posture of user H. The detected values ​​from the body pressure sensor 86 are transmitted to the mattress control unit 83. The body pressure sensor 86 is installed as needed.

[0047] When the body pressure mode button 85a of the mattress operation unit 85 is operated, the mattress control unit 83 performs supply and exhaust control of the first air cell group 61 to the third air cell group 63 of the upper mattress 60 based on the body pressure mode control program stored in the memory unit 83a.

[0048] For example, the mattress control unit 83 first exhausts the air cells 55 of the first air cell group 61. This reduces the internal pressure of the air cells 55 labeled "1" in Figure 4. Next, the mattress control unit 83 supplies air to the air cells 55 of the first air cell group 61, and then exhausts the air cells 55 of the second air cell group 62. This reduces the internal pressure of the air cells 55 labeled "2" in Figure 4.

[0049] Next, the mattress control unit 83 supplies air to the air cells 55 of the second air cell group 62, and then exhausts air from the air cells 55 of the third air cell group 63. This reduces the internal pressure of the air cells 55 labeled "3" in Figure 4. Then, the mattress control unit 83 supplies air to the air cells 55 of the third air cell group 63. This reduces the contact pressure between the user H and the upper mattress 60, and as a result, the body pressure of the user H can be distributed, thus suppressing the development of pressure sores in the user H.

[0050] Next, the gap mode, which is executed when the gap mode button 85b of the mattress control unit 85 is operated, will be explained with reference to Figures 5 to 9.

[0051] Figure 5 is a flowchart showing the gap mode control process performed by the mattress control unit. Figure 6 is an explanatory diagram showing the process of inserting a cloth sheet between the user's back and the air cell. Figure 7 is an explanatory diagram showing the process of inserting a cloth sheet between the user's buttocks and the air cell. Figure 8 is an explanatory diagram showing the process of inserting a cloth sheet between the user's thigh and the air cell. Figure 9 is a plan view showing the state in which a cloth sheet is inserted between the user and the air cell.

[0052] In this case, for example, to move a user H who cannot move from the bed 20 on their own, a lifting device (not shown) may be used to suspend the user with a cloth sheet 90. When using such a lifting device, the cloth sheet 90 to support the user H must first be inserted between the user H and the upper mattress 60. In such a case, the caregiver must repeatedly change the position of the user H while inserting the cloth sheet 90 under the user H, which may increase the caregiver's burden. Also, the user H's clothes may become disheveled, which may cause discomfort to the user H.

[0053] Therefore, the air mattress 50 of this embodiment has a gap mode. The gap mode is a mode for, for example, a caregiver to insert a cloth sheet 90 between the user H and the mattress 52. The mattress control unit 83 executes the gap mode by controlling the supply and exhaust of each air cell zone 71 to 76 of the lower mattress 70.

[0054] Figures 5 to 9 illustrate an example where a cloth sheet 90 is placed under the user H's back and thighs. The gap mode control process (program) shown in Figure 5 is stored in the memory unit 83a. The gap mode control process shown in Figure 5 is executed repeatedly at predetermined intervals. In Figure 5, each step is indicated by "S".

[0055] In S1, it is determined whether or not the gap mode button on the mattress control unit has been operated. That is, the mattress control unit 83 determines whether or not a command signal for executing the gap mode has been transmitted from the mattress control unit 85.

[0056] Then, if it is determined in S1 that "YES" means that the gap mode button 85b of the mattress control unit 85 has been operated, the process proceeds to S2. On the other hand, if it is determined in S1 that "NO" means that the gap mode button 85b of the mattress control unit 85 has not been operated, the process ends and monitoring of the operation of the gap mode button 85b continues.

[0057] In S2, the air cells in the back are deflated. Specifically, the mattress control unit 83 opens the solenoid valve and exhaust valve of the solenoid valve unit 82 corresponding to the air cells in the back 73. As a result, as shown in Figure 6, the internal pressure of the air cells in the back 73 decreases, and only the air cells in the back 73 can be deflated.

[0058] In this case, the shoulder air cell band 72 and the buttock air cell band 74 are not vented. As a result, the user H's back does not sink downwards, and a gap 200 can be formed under the user H's back. The caregiver then inserts the cloth sheet 90 into this gap 200 with its front and rear ends together. This allows the caregiver to insert the cloth sheet 90 under the user H's back without changing the user H's position. The mattress control unit 83 also measures the time elapsed since the start of venting from the back air cell band 73.

[0059] In S3, it is determined whether a predetermined time has elapsed. That is, the mattress control unit 83 determines whether a predetermined time has elapsed since the exhaust of the back air cell band 73 began. This predetermined time is stored in the memory unit 83a. The predetermined time is set to correspond to, for example, the time it takes for a caregiver to insert the cloth sheet 90 into the gap 200. The predetermined time is set through experimentation and simulation and is several tens of seconds (for example, 20 seconds). The predetermined time may be changeable by the mattress operation unit 85. The predetermined time may also be based on the time when the gap mode button 85b of the mattress operation unit 85 is operated.

[0060] Then, if S3 determines "YES," meaning the predetermined time has elapsed, the process proceeds to S4. On the other hand, if S3 determines "NO," meaning the predetermined time has not elapsed, the process continues to monitor for the elapsed time.

[0061] In S4, air is supplied to the back air cell area. Specifically, when a predetermined time has elapsed, the mattress control unit 83 opens the solenoid valve of the solenoid valve unit 82 corresponding to the back air cell area 73 and activates the air blower unit 81. When the air pressure sensor 84 detects a predetermined pressure value, the mattress control unit 83 closes the solenoid valve and stops the operation of the air blower unit 81. As a result, the back air cell area 73 inflates back to its original state. The cloth sheet 90 is then placed under the user H's back.

[0062] In step S5, the buttock air cell zone is deflated. Specifically, the mattress control unit 83 opens the solenoid valve and exhaust valve of the solenoid valve unit 82 corresponding to the buttock air cell zone 74. As a result, as shown in Figure 7, the internal pressure of the buttock air cell zone 74 decreases, and only the buttock air cell zone 74 can be deflated.

[0063] In this case, the back air cell band 73 and the thigh air cell band 75 are not vented. As a result, the user H's buttocks do not sink downwards, and a gap 201 can be formed under the user H's buttocks. The caregiver then pulls the rear end of the cloth sheet 90 placed under the user H toward the rear (into the gap 201). This allows the caregiver to insert the cloth sheet 90 under the user H's back and buttocks without changing the user H's position. The mattress control unit 83 also measures the time elapsed since the start of venting the buttock air cell band 74.

[0064] In S6, it is determined whether a predetermined time has elapsed. That is, the mattress control unit 83 determines whether a predetermined time has elapsed since the exhaust of the buttock air cell zone 74 was started. The control process in S6 is the same as the control process in S3. Note that the predetermined time in S6 and the predetermined time in S3 may be the same or different.

[0065] Then, if the result in S6 is "YES," meaning that the predetermined time has elapsed, the process proceeds to S7. On the other hand, if the result in S6 is "NO," meaning that the predetermined time has not elapsed, the process continues to monitor for the elapsed time.

[0066] In S7, air is supplied to the buttock air cell zone. Specifically, when a predetermined time has elapsed, the mattress control unit 83 opens the solenoid valve of the solenoid valve unit 82 corresponding to the buttock air cell zone 74 and activates the air blower unit 81. When the air pressure sensor 84 detects a predetermined pressure value, the mattress control unit 83 closes the solenoid valve and stops the operation of the air blower unit 81. As a result, the buttock air cell zone 74 inflates back to its original state. The cloth sheet 90 is then placed under the user H's back and buttocks.

[0067] In S8, the thigh air cell area is deflated. Specifically, the mattress control unit 83 opens the solenoid valve and exhaust valve of the solenoid valve unit 82 corresponding to the thigh air cell area 75. As a result, as shown in Figure 8, the internal pressure of the thigh air cell area 75 decreases, and only the thigh air cell area 75 can be deflated.

[0068] In this case, the buttock air cell band 74 and the lower leg air cell band 76 are not vented. As a result, the user H's thighs do not sink downwards, and a gap 202 can be formed under the user H's thighs. The caregiver then pulls the rear end of the cloth sheet 90 placed under the user H toward the rear (into the gap 202). This allows the caregiver to insert the cloth sheet 90 under the user H's back, buttocks, and thighs without changing the user H's position. The mattress control unit 83 also measures the time elapsed since the start of venting from the thigh air cell band 75.

[0069] In S9, it is determined whether a predetermined time has elapsed. That is, the mattress control unit 83 determines whether a predetermined time has elapsed since the start of exhaust from the thigh air cell belt 75. The control process in S9 is the same as the control process in S3. Note that the predetermined time in S9 and the predetermined time in S3 and S6 may be the same or different.

[0070] Then, if the result in S9 is "YES," meaning that the predetermined time has elapsed, the process proceeds to S10. On the other hand, if the result in S9 is "NO," meaning that the predetermined time has not elapsed, the process monitors for the elapsed time.

[0071] In S10, air is supplied to the thigh air cell zone. Specifically, when a predetermined time has elapsed, the mattress control unit 83 opens the solenoid valve of the solenoid valve unit 82 corresponding to the thigh air cell zone 75 and operates the air blower unit 81. When the air pressure sensor 84 detects a predetermined pressure value, the mattress control unit 83 closes the solenoid valve and stops the operation of the air blower unit 81, ending the process. As a result, the thigh air cell zone 75 inflates back to its original state. Also, as shown in Figures 8 and 9, the cloth sheet 90 is placed under the user H's back, buttocks, and thighs.

[0072] Subsequently, the caregiver, while supporting user H with the cloth sheet 90, hooks the cloth sheet 90 onto the suspension device. This allows the caregiver to move user H from the bed 20 using the suspension device.

[0073] Furthermore, when the caregiver moves user H onto the bed 20, the gap mode allows the caregiver to remove the cloth sheet 90 placed under user H without changing user H's position. In this case, friction between user H and the cloth sheet 90 is reduced, which helps to prevent user H's clothing from becoming disheveled.

[0074] In this way, when the gap mode is instructed by the mattress operation unit 85, the mattress control unit 83 controls the internal pressure of multiple air cells 55 (each air cell band 71-76) in a predetermined order. As a result, the air mattress 50 can reduce the burden on the caregiver who is caring for the user H. In addition, the air mattress 50 can also improve the comfort of the user H. Therefore, it is possible to create an air mattress 50 that is easy to use.

[0075] In the first embodiment, a gap mode was described as an example in which the supply and exhaust of air from the shoulder air cell bands 72 to the thigh air cell bands 75 is automatically performed when the fabric sheet 90 of the suspension device is placed under the user H. However, the embodiments of the present invention are not limited to this, and for example, the air mattress 50 may have other gap modes. For example, it may have a gap mode when an X-ray cassette tray is inserted under the user H, or a gap mode when a cushion or the like is inserted under the user H's body.

[0076] Furthermore, in the first embodiment, the gap mode was described as automatically proceeding to the next step after a predetermined time has elapsed. However, the embodiments of the present invention are not limited to this, and for example, the gap mode may proceed to the next step based on the operation of the mattress operation unit 85. This allows, for example, a caregiver to create a gap in the mattress 52 at their own pace.

[0077] Furthermore, in the first embodiment, the gap mode was described using the case where each air cell zone 71 to 76 is supplied and exhausted individually as an example. However, the embodiments of the present invention are not limited to this, and for example, the gap mode may involve supplying and exhausting two or more air cell zones 71 to 76 together.

[0078] Furthermore, in the first embodiment, a mattress operating unit 85 having a gap mode button 85b was described as an example. However, the embodiments of the present invention are not limited to this, and for example, the mattress operating unit 85 may have buttons to individually supply and exhaust air to each air cell zone 71 to 76.

[0079] Next, an air mattress 50 according to a second embodiment of the present invention will be described with reference to Figures 10 to 13.

[0080] If the bottom 23 changes from a flat state (state shown in Figure 11) to a state where the back bottom 23a is upright (state shown in Figure 12), there is a risk that the pillow 100 may fall off. Therefore, the air mattress 50 according to the second embodiment is configured to control the internal pressure of the head air cell band 71 so that the pillow 100 does not fall off when, for example, the bottom 23 of the bed 20 is tilted.

[0081] Figure 10 is a flowchart showing the pillow-holding mode control process of an air mattress according to a second embodiment of the present invention. Figure 11 is an explanatory diagram showing the state of the air cell when the bottom is flat. Figure 12 is an explanatory diagram showing the state of the air cells when the back bottom is upright.

[0082] The pillow-holding mode control process (program) shown in Figure 10 is pre-stored in the memory unit 83a. The pillow-holding mode may be enabled or disabled by the mattress operation unit 85. The pillow-holding mode control process shown in Figure 10 is executed repeatedly at predetermined intervals, for example, when the pillow-holding mode is set to enabled. In Figure 10, each step is indicated by "S".

[0083] In S11, the detection result of the angle sensor is acquired. That is, the mattress control unit 83 acquires the detection result of the angle sensor 37 transmitted from the bed control unit 39. As shown in Figure 12, in this example, the angle sensor 37 detects the back angle α of the back bottom 23a of the bed 20. The back angle α of the back bottom 23a is equivalent to the inclination angle of the head air cell band 71 with respect to the horizontal direction. Alternatively, the air mattress 50 may be equipped with an angle sensor that detects the inclination angle of the head air cell band 71 with respect to the horizontal direction, and the mattress control unit 83 may acquire the detection result of this angle sensor.

[0084] In S12, it is determined whether the back angle α is greater than or equal to the first angle threshold α1 (α≧α1). The first angle threshold α1 is stored in the memory unit 83a. The first angle threshold α1 is set to an angle such that the pillow 100 does not slip off, for example. The first angle threshold α1 is set to approximately 20 degrees. The first angle threshold α1 may be changeable by the mattress operation unit 85.

[0085] Then, if the result in S12 is "YES," meaning the back angle α is greater than or equal to the first angle threshold α1 (α≧α1), the process proceeds to S13. On the other hand, if the result in S12 is "NO," meaning the back angle α is less than the first angle threshold α1 (α<α1), the process ends.

[0086] In S13, the internal pressure of the head air cell zone is reduced to a first predetermined value. This first predetermined value is stored in the memory unit 83a. The mattress control unit 83 controls the air blower unit 81 and the solenoid valve unit 82 to reduce the internal pressure of the head air cell zone 71 to the first predetermined value. That is, the mattress control unit 83 slightly deflates the head air cell zone 71 when the back angle α becomes greater than or equal to the first angle threshold α1. The mattress control unit 83 performs control to slightly reduce the internal pressure of the head air cell zone 71 before the pillow 100 slides off. In other words, the control process in S13 is, for example, a preparatory stage before the pillow 100 slides off. The first predetermined value may be changeable by the mattress operation unit 85.

[0087] In S14, it is determined whether the back angle α is greater than or equal to the second angle threshold α2 (α≧α2). The second angle threshold α2 is stored in the memory unit 83a. The second angle threshold α2 is set to a value greater than the first angle threshold α1. That is, the back bottom 23a is in a state where the back angle α is more upright when the second angle threshold α2 is greater than when the first angle threshold α1 is greater. The second angle threshold α2 is set to an angle at which the pillow 100 will slide off. The second angle threshold α2 is set to, for example, about 30 degrees. The second angle threshold α2 may be changeable by the mattress operation unit 85.

[0088] Then, if the result in S14 is "YES," meaning the back angle α is greater than or equal to the second angle threshold α2 (α≧α2), the process proceeds to S15. On the other hand, if the result in S14 is "NO," meaning the back angle α is less than the second angle threshold α2 (α<α2), the process ends.

[0089] In S15, the internal pressure of the head air cell zone is reduced to a second predetermined value. This second predetermined value is smaller than the first predetermined value and is stored in the memory unit 83a. The second predetermined value is, for example, complete exhaust (0 kPa) of the head air cell zone 71. The mattress control unit 83 controls the air blower unit 81 and the solenoid valve unit 82 to reduce the internal pressure of the head air cell zone 71 to the second predetermined value. That is, when the back angle α becomes greater than or equal to the second angle threshold α2, the mattress control unit 83 deflates the head air cell zone 71, bringing it to an end. As a result, as shown in Figure 12, the upper surface of the upper mattress 60 on which the pillow 100 is placed can be recessed. As a result, the pillow 100 is supported by the upper mattress 60 and is prevented from sliding off. The second predetermined value may be changeable by the mattress operation unit 85.

[0090] S16 sets the internal pressure of the head air cell zone to an initial value. That is, if the back angle α is less than the first angle threshold α1, the mattress control unit 83 sets the internal pressure of the head air cell zone 71 to an initial value and ends the process. This initial value is stored in the memory unit 83a. The initial value is, for example, the maximum internal pressure value of the head air cell zone 71. Note that the initial value may be changeable by the mattress operation unit 85.

[0091] S17 maintains the internal pressure of the head air cell zone at a first predetermined value. That is, the mattress control unit 83 maintains the internal pressure of the head air cell zone 71 at the first predetermined value when the back angle α is greater than or equal to the first angle threshold α1 and less than the second angle threshold α2, and then the process ends.

[0092] Figure 13 is an explanatory diagram showing a state where the bottom is sloped. In the second embodiment described above, the case in which the back angle α of the back bottom 23a is detected and the internal pressure of the head air cell band 71 is controlled was explained as an example, as shown in Figure 12. However, in cases where the entire bottom 23 of the bed 20 is inclined, for example as shown in Figure 13, the inclination angle β of the bottom 23 may be used as the inclination angle of the head air cell band 71 with respect to the horizontal direction.

[0093] Thus, according to the second embodiment of the air mattress 50, there is a head air cell band 71 located under the head of the user H when lying down, and the mattress control unit 83 has a pillow holding mode that controls the internal pressure of the head air cell band 71 based on the inclination angle of the head air cell band 71 with respect to the horizontal direction. This prevents the pillow 100 from sliding off, for example, when the back bottom 23a of the bed 20 is tilted. Therefore, an air mattress 50 that is easy to use can be made.

[0094] Furthermore, the angle threshold includes a first angle threshold α1 and a second angle threshold α2 which is greater than the first angle threshold α1. When the inclination angle of the head air cell zone 71 becomes greater than or equal to the first angle threshold α1, the mattress control unit 83 reduces the internal pressure of the head air cell zone 71 to a first predetermined value. Then, when the inclination angle of the head air cell zone 71 becomes greater than or equal to the second angle threshold α2, the mattress control unit 83 reduces the internal pressure of the head air cell zone 71 to a second predetermined value which is smaller than the first predetermined value. In this way, by gradually reducing the internal pressure of the head air cell zone 71, the pillow 100 can be effectively prevented from sliding off.

[0095] Furthermore, if, for example, the upper mattress 60 and the lower mattress 70 each have their own dedicated air blowers 81, the mattress control unit 83 may control the pillow holding mode and the body pressure mode simultaneously.

[0096] In the second embodiment, the case in which the internal pressure of the head air cell band 71 is reduced to suppress the fall of the pillow 100 was described as an example. However, the embodiments of the present invention are not limited to this, and for example, the bed 20 may have a pillow placement section that is lowered by one level on the back bottom 23a. In this case, the front end of the upper mattress and the front end of the lower mattress are located at the shoulders of the user lying down. The pillow 100 is then placed in the pillow placement section that is lowered by one level below the upper surface of the upper mattress. This makes it possible to suppress the fall of the pillow 100 even if, for example, the back bottom 23a is tilted up or down.

[0097] Next, with reference to Figure 14, an air mattress 50 according to a third embodiment of the present invention will be described.

[0098] The preferred height of the pillow 100 varies depending on the user H. Furthermore, the preferred height of the pillow 100 may also differ depending on the user H's sleeping position (supine or lateral). Therefore, the air mattress 50 according to the third embodiment allows the user H to adjust the height of the pillow 100 to their preferred height by changing the internal pressure of the head air cell zone 71.

[0099] Figure 14 is a flowchart showing the pillow height mode control process of an air mattress according to a third embodiment of the present invention. The pillow height mode control process (program) shown in Figure 14 is pre-stored in the memory unit 83a. The pillow height mode may be enabled or disabled by the mattress operation unit 85. The pillow height mode control process shown in Figure 14 is executed repeatedly at predetermined intervals, for example, when the pillow height mode is enabled. In Figure 14, each step is indicated by "S".

[0100] In S21, the detection results from the body pressure sensor are acquired. The mattress control unit 83 determines the sleeping posture of user H based on the detection results from the body pressure sensor 86. Note that the sleeping posture of user H is not limited to detection by the body pressure sensor 86. For example, an AI camera capable of detecting the sleeping posture of user H through image analysis may be used. The mattress control unit 83 may also determine the sleeping posture of user H based on the detection results from the AI ​​camera.

[0101] In the next step, S22, it is determined whether the user's sleeping position is supine or not. The mattress control unit 83 determines the user H's sleeping position based, for example, on the pressure distribution applied to the air cells 55 detected by the body pressure sensor 86.

[0102] Then, if the answer in S22 is "YES," meaning that user H's sleeping position is supine, the process proceeds to S23. On the other hand, if the answer in S22 is "NO," meaning that user H's sleeping position is not supine (i.e., lateral), the process proceeds to S24. The mattress control unit 83 may also determine whether user H's sleeping position is lateral or not. In such cases, if the answer in S22 is "YES," the process proceeds to S24, and if the answer in S22 is "NO," the process proceeds to S23.

[0103] In S23, the internal pressure of the head air cell zone is set to the set pressure for the supine position. The set pressure for the supine position can be changed, for example, by the mattress operation unit 85, and the set pressure is stored in the memory unit 83a. The mattress control unit 83 controls the air blower unit 81 and the solenoid valve unit 82 to set the internal pressure of the head air cell zone 71 to the set pressure for the supine position, and the process ends. As a result, when user H is in a supine position, the air mattress 50 can automatically adjust the height of the pillow 100 to the user H's preferred height.

[0104] In S24, the internal pressure of the head air cell zone is set to the set pressure for the lateral position. The set pressure for the lateral position can be changed, for example, by the mattress operation unit 85, and the set pressure is stored in the memory unit 83a. The mattress control unit 83 controls the air blower unit 81 and the solenoid valve unit 82 to set the internal pressure of the head air cell zone 71 to the set pressure for the lateral position, and the process ends. As a result, when user H is in a lateral position, the air mattress 50 can automatically adjust the height of the pillow 100 to the user H's preferred height. For example, the set pressure for the lateral position is set lower than the set pressure for the supine position. This is because when user H is in a lateral position, a higher pillow height is more suitable for user H than when user H is in a supine position.

[0105] Thus, the mattress control unit 83 has a pillow height mode that controls the internal pressure of the head air cell zone 71 based on the user H's sleeping position. This allows the air mattress 50 to be adjusted to the user H's preferred pillow height based on their sleeping position. In this case, the air mattress 50 can be adjusted to the user H's preferred pressure, making it compatible with various pillows 100. Therefore, it can be made into a user-friendly air mattress 50.

[0106] Figure 15 is an explanatory diagram showing an air mattress according to the fourth embodiment of the present invention. In the embodiments described above, the case in which the upper mattress 60 is placed on the head air cell band 71 was used as an example. However, the embodiments of the present invention are not limited to this, and for example, as shown in Figure 15, the mattress 110 does not have to have the upper mattress 60 under the user H's head. The head air cell band 120 has three air cells 55 arranged in the front-to-back direction, with the vertical height of the upper mattress 60 and the lower mattress 70 being combined. That is, the upper surface of the head air cell band 120 is at the same position as the upper surface of the upper mattress 60. In this case, the pillow 100 is placed directly on the head air cell band 120. When, for example, the body pressure mode is performed, the mattress 110 can prevent the user H's head from moving, thus suppressing deterioration of the user H's sleeping comfort. Note that the head air cell band 120 may consist of three air cells 55 combined into one.

[0107] Furthermore, for example, the upper surface of the head air cell band 120 may protrude above the upper surface of the upper mattress 60. This allows the head air cell band 120 to be used as a pillow. In this case, by changing the internal pressure of the head air cell band 120, the pillow can be made to the user H's preferred firmness.

[0108] The air mattress 50 may be controlled in the following manner regarding the relationship between back angle, rehabilitation, and sleeping posture.

[0109] The air mattress 50 may gradually lower the pressure of the mattress 52 from a first predetermined value to a second predetermined value as the angle α of the back angle increases. Also, when performing rehabilitation on user H, the entire bed 20 may be tilted as shown in Figure 13 to allow user H to exercise. In such cases, if the body pressure sensor 86 detects a change in body pressure exceeding a threshold, the pressure of the mattress 52 may be lowered to a third predetermined value, which is lower than the first predetermined value. If the entire bed 20 is tilted, the third predetermined value may be lower than the second predetermined value. For the sake of explanation, the body pressure sensor 86 detects changes in body pressure to determine whether user H is undergoing rehabilitation, but this is not the only method; for example, changes in body movement may be detected by other body movement sensors to determine whether user H is undergoing rehabilitation. The determination of whether user H is undergoing rehabilitation may be performed, for example, by the mattress control unit 83.

[0110] Furthermore, as explained above, the internal pressure of the mattress 52 may be controlled differently depending on whether the user H is lying on their back or on their side. Similarly, the internal pressure of the mattress 52 may also be controlled differently depending on the user H's sleeping position when the angle α of the back angle increases.

[0111] For example, when user H is lying supine, the internal pressure of the mattress 52 when the entire bed 20 is not tilted or the bottom 23 is not tilted up may be set to be greater than the internal pressure when the entire bed 20 is tilted or the bottom 23 is tilted up. Similarly, when user H is lying on their side, the internal pressure of the mattress 52 when the entire bed 20 is not tilted or the bottom 23 is not tilted up may be set to be greater than the internal pressure when the entire bed 20 is tilted or the bottom 23 is tilted up. Furthermore, when performing control according to the angle α of the back angle and control according to whether or not rehabilitation is being performed, the internal pressure control of the mattress 52 according to the sleeping position may be disabled.

[0112] In the embodiments described above, the case in which the bed operating unit 35 and the mattress operating unit 85 are separate operating units was used as an example. However, the embodiments of the present invention are not limited to this, and for example, the bed operating unit 35 and the mattress operating unit 85 may be a common operating unit.

[0113] In the embodiments described above, the air mattress 50 was explained using as an example the case in which the mattress 52 has a two-layer structure consisting of an upper mattress 60 and a lower mattress 70. However, the embodiments of the present invention are not limited to this, and the air mattress may have a single-layer structure consisting only of a lower mattress capable of performing, for example, a gap mode, a pillow-holding mode, and a pillow-height mode.

[0114] In the embodiments described above, the case in which the angle sensor 37 is provided on the bed 20 was used as an example. However, the embodiments of the present invention are not limited to this, and the angle sensor may be provided on the mattress 52. Alternatively, the angle sensor 37 provided on the bed 20 may detect the inclination angle of the mattress 52. In this case, the mattress control unit 83 may acquire its own angle information from the bed control unit 39.

[0115] The embodiment may include the following configurations. (Composition 1) Multiple air cells arranged in the front-to-back direction, A mattress control unit that controls the internal pressure of the plurality of air cells, A mattress operating unit that is operated to change the internal pressure of the plurality of air cells, Equipped with, The air mattress is characterized in that the mattress control unit has a gap mode that creates a gap between the user on the air cell and the air cell based on the operation of the mattress operation unit. (Configuration 2) The aforementioned multiple air cells are The first air cell zone, which is arranged in the front-to-back direction and has the same intake and exhaust system, The intake and exhaust systems are arranged in the front-to-back direction and consist of a second air cell band that is different from the first air cell band, The intake and exhaust systems are arranged in the front-to-back direction and consist of a third air cell band that is different from the first air cell band and the second air cell band, An air mattress according to configuration 1, characterized by having the following features. (Composition 3) Upper mattress and The lower mattress is located beneath the upper mattress, It has, The air mattress according to configuration 1 or 2, characterized in that the mattress control unit controls the internal pressure of the air cells of the lower mattress when the gap mode is executed. (Composition 4) The mattress control unit further includes a body pressure mode for distributing the user's body pressure on the air cells, The air mattress according to configuration 3, characterized in that the mattress control unit controls the internal pressure of the air cells of the upper mattress when the body pressure mode is executed. (Composition 5) The air mattress according to any one of configurations 1 to 4, characterized in that the mattress control unit controls the internal pressure of the plurality of air cells in a predetermined order when the gap mode is instructed by the mattress operation unit. (Composition 6) It has a head air cell band located beneath the head of the user when they are lying down. The air mattress according to any one of configurations 1 to 5, characterized in that the mattress control unit has a pillow holding mode that controls the internal pressure of the head air cell band based on the inclination angle of the head air cell band with respect to the horizontal direction. (Composition 7) The angle threshold comprises a first angle threshold and a second angle threshold that is greater than the first angle threshold. The mattress control unit is If the inclination angle of the head air cell band exceeds the first angle threshold, the internal pressure of the head air cell band is reduced to a first predetermined value. The air mattress according to configuration 6, characterized in that when the inclination angle of the head air cell band becomes greater than or equal to the second angle threshold, the internal pressure of the head air cell band is reduced to a second predetermined value which is smaller than the first predetermined value. (Composition 8) The air mattress according to any one of configurations 1 to 7, characterized in that the mattress control unit has a pillow height mode that controls the internal pressure of the head air cell zone based on the user's sleeping posture.

[0116] The embodiments described above are examples that embody the present invention, and the present invention is not limited to these embodiments. For example, the present invention also includes the addition, deletion, or modification of some components in the embodiments described above. [Explanation of Symbols]

[0117] 10 Electric Bed Units 20 beds 21 Base Frame 22 Mainframes 23 Bottom 23a Back bottom 23b Waist Bottoms 23cm knee bottoms 23d Leg Bottom 25 Lifting mechanism 31 First drive unit 32 Second drive unit 33 Third drive unit 35 Bed control unit 35a Backrest adjustment button 35b Back lowering button 35c Leg lift button 35d Leg lowering button 35e Up button 35f Down button 37 Angle Sensor 39 Bed Control Unit 39a Storage section 50 Air Mattress 52 mattresses 55 Air Cells 60 Upper mattress 61. First air cell group 62 Second Air Cell Group 63 Third Air Cell Group 70 Lower mattress 71 Head air cell band 72 Shoulder air cell band 73 Back air cell band 74. Buttock Air Cell Band 75 Thigh Air Cell Band 76 Lower leg air cell band 80 Pump Unit 81 Air blower 82 Solenoid valve unit 83 Mattress Control Unit 83a Storage section 84. Pneumatic Sensor 85 Mattress control unit 85a Body pressure mode button 85b Gap Mode Button 86 Body pressure sensor 90 cloth seats 100 pillows 110 Mattress 120 Head Air Cell Band 200, 201, 202 gap F Floor H user

Claims

1. Multiple air cells arranged in the front-to-back direction, A mattress control unit that controls the internal pressure of the plurality of air cells, A mattress operating unit that is operated to change the internal pressure of the plurality of air cells, Equipped with, The air mattress is characterized in that the mattress control unit has a gap mode that creates a gap between the user on the air cell and the air cell based on the operation of the mattress operation unit.

2. The aforementioned multiple air cells are The first air cell zone, which is arranged in the front-to-back direction and has the same intake and exhaust system, The intake and exhaust systems are arranged in the front-to-back direction and consist of a second air cell zone that is different from the first air cell zone, The intake and exhaust systems are arranged in the front-to-back direction and consist of a third air cell band that is different from the first air cell band and the second air cell band, The air mattress according to claim 1, characterized by having the following features.

3. Upper mattress and The lower mattress is located beneath the upper mattress, It has, The air mattress according to claim 1, characterized in that the mattress control unit controls the internal pressure of the air cells of the lower mattress when the gap mode is executed.

4. The mattress control unit further includes a body pressure mode for distributing the user's body pressure on the air cells, The air mattress according to claim 3, characterized in that the mattress control unit controls the internal pressure of the air cells of the upper mattress when executing the body pressure mode.

5. The air mattress according to claim 1, characterized in that the mattress control unit controls the internal pressure of the plurality of air cells in a predetermined order when the gap mode is instructed by the mattress operation unit.

6. It has a head air cell band located beneath the head of the user when they are lying down. The air mattress according to claim 1, characterized in that the mattress control unit has a pillow holding mode that controls the internal pressure of the head air cell band based on the inclination angle of the head air cell band with respect to the horizontal direction.

7. The angle threshold comprises a first angle threshold and a second angle threshold that is greater than the first angle threshold. The mattress control unit is If the inclination angle of the head air cell band exceeds the first angle threshold, the internal pressure of the head air cell band is reduced to a first predetermined value. The air mattress according to claim 6, characterized in that when the inclination angle of the head air cell band becomes greater than or equal to the second angle threshold, the internal pressure of the head air cell band is reduced to a second predetermined value which is smaller than the first predetermined value.

8. The air mattress according to claim 1, characterized in that the mattress control unit has a pillow height mode that controls the internal pressure of the head air cell zone based on the user's sleeping posture.

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