Air mattress for wheelchair

Abstract

To provide an air mattress for wheelchair having good usability.SOLUTION: An air mattress for wheelchair includes: an air mattress unit spread on a wheelchair that allows change of a position between a seated position and a bed position; a blower for supplying air to the air mattress unit; an electromagnetic valve unit disposed between the air mattress unit and the blower; a controller configured to control operation of the blower unit and of the electromagnetic valve unit; and an angle sensor capable of detecting the position, the controller configured to execute control of the operation of the blower unit and of the electromagnetic valve unit according to a detection value of the angle sensor.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] FIELD OF THE INVENTION Aspects of the present invention generally relate to air mattresses for wheelchairs. [Background technology]

[0002] An air mattress that can be placed on a wheelchair is known (Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2014-121365 Summary of the Invention [Problem to be solved by the invention]

[0004] The air mattress disclosed in Patent Document 1 changes the air pressure in the air cells based on the operation of a switch, which may make it difficult to use.

[0005] Aspects of the present invention provide a user-friendly air mattress for a wheelchair. [Means for solving the problem]

[0006] One aspect of the present invention is an air mattress for a wheelchair, comprising: an air mattress unit that is placed on a wheelchair and whose position can be changed between a seated position and a bed position; a blower unit that supplies air to the air mattress unit; an electromagnetic valve unit located between the air mattress unit and the blower unit; a control unit that controls the operation of the blower unit and the electromagnetic valve unit; and an angle sensor that can detect the position, wherein the control unit controls the operation of the blower unit and the electromagnetic valve unit based on the detection value of the angle sensor. [Effects of the Invention]

[0007] Aspects of the present invention can provide an air mattress for a wheelchair that is easy to use. [Brief explanation of the drawings]

[0008] [Figure 1] 1 is a side view showing a wheelchair equipped with an air mattress for a wheelchair according to an embodiment of the present invention. [Figure 2] FIG. 1 is a simplified explanatory diagram showing an air mattress unit placed on a wheelchair. [Figure 3] FIG. 1 is a block diagram showing a control system for a wheelchair air mattress. [Figure 4] FIG. 2 is a plan view of the air mattress unit viewed from above. [Figure 5] FIG. 10 is an explanatory diagram showing the state of the air mattress unit in the bed position. [Figure 6] FIG. 10 is an explanatory diagram showing the state of the air mattress unit in a seated position. [Figure 7] FIG. 10 is a cross-sectional view showing the state in which air has been supplied into the air cells of the leg air mattress. [Figure 8] FIG. 8 is a cross-sectional view showing a state in which the air cell in FIG. 7 is evacuated. [Figure 9] 10 is a flow chart showing the supply and exhaust control of the first air cell of the back air mattress executed by the control unit. [Figure 10] 10 is a flowchart showing the supply and exhaust control of the leg air mattress executed by the control unit. [Figure 11] 10 is a flowchart showing the air supply and exhaust control of the air mattress unit executed by the control unit. DETAILED DESCRIPTION OF THE INVENTION

[0009] An air mattress for a wheelchair according to an embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a side view showing a wheelchair equipped with an air mattress for a wheelchair according to an embodiment of the present invention.

[0010] In the wheelchair 100, the angle of the backrest 102 and the angle of the footrest 103 can be changed relative to the seat 101 on which the user sits. Furthermore, in the wheelchair 100, the angle of the step 104 can be changed relative to the footrest 103. Specifically, the wheelchair 100 can be changed between a seated position shown by a solid line in FIG. 1 and a bed position shown by a two-dot chain line in FIG. 1. The position of the wheelchair 100 can be changed, for example, by operating the handle 110. In this example, the backrest 102, the footrest 103, and the step 104 of the wheelchair 100 move in unison relative to the seat 101. In the wheelchair air mattress 10, the bed position will be described with the user's feet side as the "front," the head side as the "rear," the right hand side as the "right," and the left hand side as the "left."

[0011] The wheelchair 100 has handrails 120 on both the left and right sides. The handrails 120 are movable in the up and down direction. When the handrails 120 are positioned at the top, they serve as armrests for the user. On the other hand, as shown in FIG. 1, the wheelchair 100 is designed so that the handrails 120 can be lowered. In FIG. 1, the handrail 120 on the right side is lowered. By lowering the handrails 120 in the bed position, the caregiver can easily transfer the user from the bed into the wheelchair 100.

[0012] FIG. 2 is a simplified explanatory diagram showing an air mattress unit placed on a wheelchair. The wheelchair air mattress 10 (hereinafter referred to as the air mattress 10) is detachably attached to the wheelchair 100. The air mattress 10 has an air mattress unit 20 that supports the body of a user using the wheelchair 100. The air mattress 10 is designed so that its hardness can be changed by supplying or discharging air from the air mattress unit 20. The air mattress 10 includes the air mattress unit 20, a pump unit 60, and an angle sensor 76.

[0013] The air mattress unit 20 has a seat air mattress 30, a back air mattress 40, and a leg air mattress 50. As shown in Fig. 1, the seat air mattress 30, the back air mattress 40, and the leg air mattress 50 are housed inside a cover 15. Fig. 2 shows the unit with the cover 15 removed.

[0014] The seat air mattress 30 is the part that is placed on the seat surface 101 of the wheelchair 100. The seat air mattress 30 has a plurality of air cells 31 that correspond to the seat surface 101 of the wheelchair 100. In this example, the seat air mattress 30 has six air cells 31 lined up in the front-to-rear direction. An air supply and exhaust section is provided on the back side of each air cell 31 to which a tube 80, which will be described later, is connected.

[0015] The seat air mattress 30 allows the hardness of each air cell 31 to be individually adjusted by supplying or discharging air inside each air cell 31. By adjusting the hardness of each air cell 31, the seat air mattress 30 can provide the user with a comfortable sitting or sleeping experience. In the seat air mattress 30, each air cell 31 is integrally connected by a band 32. The band 32 extends in the front-to-back direction on the side of each air cell 31.

[0016] The back air mattress 40 is placed on the backrest 102 of the wheelchair 100. The back air mattress 40 has a plurality of air cells 41 corresponding to the backrest 102 of the wheelchair 100.

[0017] In this example, the back air mattress 40 has 11 air cells 41 arranged in the front-to-rear direction. On the back side of each air cell 41, an air supply / exhaust section is provided to which a tube 80 (described later) is connected.

[0018] The air cells 41 of the back air mattress 40 are integrated with the air cells 31 of the seat air mattress 30 by bands 42. The back air mattress 40 differs from the seat air mattress 30 only in number, and otherwise has the same configuration. By changing the hardness of each air cell 41, the back air mattress 40 can provide the user with a comfortable sitting or sleeping experience.

[0019] The leg air mattress 50 is placed on the foot rest 103 and step 104 of the wheelchair 100. The leg air mattress 50 has a plurality of air cells 51 corresponding to the foot rest 103 and step 104 of the wheelchair 100. In this example, the leg air mattress 50 has eight air cells 51 lined up in the front-to-rear direction. An air supply / exhaust section 51a is provided on the back side of each air cell 51 to which a tube 80, described below, is connected.

[0020] The air cells 51 of the leg air mattress 50 have a different shape from the air cells 31 of the seat air mattress 30 and the air cells 41 of the back air mattress 40. The leg air mattress 50 is formed so as to become as thin as possible when the air inside is exhausted. The specific shape of the air cells 51 will be explained later.

[0021] The seat air mattress 30, the back air mattress 40, and the leg air mattress 50 are each separable, so that the air mattress unit 20 allows each of the air mattresses 30, 40, and 50 to be replaced individually.

[0022] The back air mattress 40 and the leg air mattress 50 are able to rise and fall relative to the seat air mattress 30. That is, the air mattress unit 20 is bendable between the seat air mattress 30 and the back air mattress 40, and between the seat air mattress 30 and the leg air mattress 50. This allows the air mattress unit 20 to follow the bed position and the sitting position of the wheelchair 100.

[0023] FIG. 3 is a block diagram showing the control system of the wheelchair air mattress. The pump unit 60 is mounted, for example, below the seat 101 of the wheelchair 100. The pump unit 60 supplies air to the air mattress unit 20. That is, the pump unit 60 controls the hardness of the air mattress unit 20 by supplying and discharging air to and from each of the air cells 31, 41, and 51. The pump unit 60 has a control unit 61, an electromagnetic valve unit 62, and an air blower 65.

[0024] The control unit 61 controls the hardness by changing the internal pressure of the air mattress unit 20. The control unit 61 has a memory unit 61a that stores a control program for controlling the hardness of the air mattress unit 20. The control unit 61 controls the operation of the blower unit 65 and the operation of the solenoid valve unit 62.

[0025] The control unit 61 is connected to an operation unit 70 (remote control) and controls the operation of the air blower 65 and the opening and closing of the solenoid valve unit 62 based on command signals from the operation unit 70. The control unit 61 also controls the operation of the air blower 65 and the opening and closing of the solenoid valve unit 62 based on the detection value of an angle sensor 76, which will be described later. The control unit 61 automatically controls the hardness of each air mattress 30, 40, 50 by operating the air blower 65 and the opening and closing of the solenoid valve unit 62. The control unit 61 operates using power supplied from a battery 75. The battery 75 is mounted below the seat 101 of the wheelchair 100 and is a rechargeable secondary battery.

[0026] The solenoid valve unit 62 is located between the air mattress unit 20 and the blower 65. The solenoid valve unit 62 has a plurality of solenoid valves. Each solenoid valve is connected to a pipeline 67 and a tube 80. The same solenoid valve is used for the air cells 31, 41, and 51 that are commonly controlled. Note that the number of solenoid valves may correspond to the number of air cells 31, 41, and 51. The solenoid valve unit 62 has solenoid valves located between the blower 65 and each air cell 31, 41, and 51, and exhaust valves that exhaust air from each air cell 31, 41, and 51 to the outside.

[0027] When the solenoid valve is open and the blower 65 is operating, air from the blower 65 is supplied to each of the air cells 31, 41, and 51. When the solenoid valve and the exhaust valve are open and the blower 65 is stopped, the air inside each of the air cells 31, 41, and 51 is exhausted. The opening and closing operations of each of the solenoid valves and exhaust valves are controlled by the control unit 61.

[0028] The blower 65 supplies air to the air mattress unit 20. Specifically, the blower 65 supplies air to each of the air cells 31, 41, and 51 via the solenoid valve unit 62. The operation of the blower 65 is controlled by the control unit 61. The control unit 61 controls the operation of the blower 65 based on a command signal from the operation unit 70. Air is supplied to each of the air cells 31, 41, and 51 when the blower 65 operates with the solenoid valve of the solenoid valve unit 62 in an open state.

[0029] The air pressure sensor 66 is provided in a pipe 67 that connects the solenoid valve unit 62 and the blower 65. The air pressure sensor 66 detects the internal pressure of the pipe 67, thereby detecting the internal pressure of each of the air cells 31, 41, and 51. The air pressure sensor 66 transmits the detected value to the control unit 61. The control unit 61 controls the operation of the blower 65 and the opening and closing of each solenoid valve of the solenoid valve unit 62 based on the detected value of the air pressure sensor 66.

[0030] The angle sensor 76 is capable of detecting the position of the wheelchair 100 or the air mattress unit 20. The angle sensor 76 is provided, for example, in the air mattress unit 20, and detects the angle between the seat air mattress 30 and the back air mattress 40. The angle sensor 76 may also detect, for example, the angle between the seat air mattress 30 and the leg air mattress 50. The angle sensor 76 may also detect, for example, the angle between the seat portion 101 and the backrest portion 102 of the wheelchair 100, the angle between the seat portion 101 and the footrest portion 103, or the angle between the footrest portion 103 and the step portion 104. The angle sensor 76 transmits the detected value to the control unit 61. The control unit 61 controls the internal pressure of the air mattress unit 20 based on the detected value of the angle sensor 76.

[0031] FIG. 4 is a plan view of the air mattress unit as seen from above. The tube 80 is used to supply air from the pump unit 60 to the air mattress unit 20. The tube 80 is a flexible conduit such as a rubber hose, and connects the solenoid valve unit 62 to each of the air cells 31, 41, and 51. The tube 80 is provided on the back surface 21 of the air mattress unit 20. A plurality of tubes 80 are provided, and each is connected to each of the air cells 31, 41, and 51.

[0032] Of the air cells 31, 41, and 51, the air cells that are controlled to the same hardness (internal pressure) are connected by the same tube 80. That is, the air supply and exhaust portions of the air cells 31, 41, and 51 that are controlled in the same way are connected to the same tube 80.

[0033] The wheelchair air mattress 10 is designed to detect the positions of the wheelchair 100 and the air mattress unit 20 using an angle sensor 76, and automatically control the internal pressure of each air cell 31, 41, 51 of the air mattress unit 20. This automatic control is performed, for example, by setting the operation unit 70 to automatic mode. The control unit 61 controls the operation of the blower unit 65 and the solenoid valve unit 62 based on the detection by the angle sensor 76.

[0034] The air intake and exhaust control that is automatically performed when the position of the wheelchair 100 is changed will be described with reference to FIGS. FIG. 5 is an explanatory diagram showing the state of the air mattress unit in the bed position. FIG. 6 is an explanatory diagram showing the state of the air mattress unit in the seated position. FIG. 7 is a cross-sectional view showing the state in which air has been supplied into the air cells of the leg air mattress. FIG. 8 is a cross-sectional view showing a state in which the air cell in FIG. 7 has been evacuated. FIG. 9 is a flow chart showing the air supply / exhaust control of the first air cell of the back air mattress executed by the control unit.

[0035] 5 and 6, the back air mattress 40 has a first air cell 41a located behind the seat air mattress 30 and a second air cell 41b located behind the first air cell 41a. Of the multiple air cells 41 of the back air mattress 40, the first air cell 41a is the air cell located furthest forward (closer to the seat air mattress 30) in the bed position.

[0036] For example, when the air mattress unit 20 is changed from the bed position shown in Figure 5 to the seated position shown in Figure 6, the first air cell 41a may come into contact with the seat air mattress 30, preventing a smooth change to the seated position.

[0037] Therefore, when the angle sensor 76 detects a change from the bed position to the seated position, the control unit 61 causes the first air cell 41a to vent. The storage unit 61a of the control unit 61 stores an air intake / exhaust control program and a first threshold value αx of the angle sensor 76 shown in FIG. 9. The control process shown in FIG. 9 is repeatedly executed after the automatic mode is set. Each step is indicated by "S."

[0038] In S1, the control unit 61 obtains the detection value α1 of the angle sensor 76. That is, the control unit 61 obtains the angle of the back air mattress 40 relative to the seat air mattress 30 transmitted from the angle sensor 76.

[0039] In the next step S2, it is determined whether the detection value α1 of the angle sensor 76 is equal to or greater than the first threshold value αx. That is, the control unit 61 determines whether the caregiver is attempting to change the position from the bed position to the sitting position by operating the handle 110.

[0040] As shown in Figure 5, when the air mattress unit 20 is in the bed position, the detection value α1 of the angle sensor 76 is approximately 180 degrees. When the air mattress unit 20 is changed from the bed position to the sitting position, as shown in Figure 6, the detection value α1 of the angle sensor 76 becomes greater than 180 degrees.

[0041] Therefore, the first threshold value αx is set to a value greater than the angle (approximately 180 degrees) in the bed position. The first threshold value αx is set to an angle at which the first air cells 41a do not come into contact with the seat air mattress 30 when the back air mattress 40 is raised. The first threshold value αx is set to a value between 200 degrees and 220 degrees, for example.

[0042] If S2 returns "YES," that is, if it is determined that the detected value α1 of the angle sensor 76 is equal to or greater than the first threshold value αx, the process proceeds to S3. On the other hand, if S2 returns "NO," that is, if it is determined that the detected value α1 of the angle sensor 76 is less than the first threshold value αx, the process ends.

[0043] In S3, the first air cell 41a is vented. That is, the control unit 61 opens the vent valve of the solenoid valve unit 62 connected to the first air cell 41a, and the process ends. As a result, as shown in FIG. 6, when the wheelchair 100 is shifted from the bed position to the seated position, the first air cell 41a is prevented from coming into contact with the seat air mattress 30. Therefore, the wheelchair 100 and the air mattress unit 20 can be smoothly shifted from the bed position to the seated position.

[0044] Here, the back air mattress 40 has a sliding sheet (not shown) on the surface facing the user. This sliding sheet has a smaller coefficient of friction than the surface facing the seat air mattress 30. As a result, when the air mattress unit 20 is changed from the bed position to the seated position, the user's back slides relative to the back air mattress 40, reducing pressure on the user's abdomen. The sliding sheet may also be provided on the leg air mattress 50. By providing sliding sheets on the back air mattress 40 and the leg air mattress 50, the user can change positions while remaining in a stable seated position.

[0045] FIG. 10 is a flow chart showing the air supply and exhaust control of the leg air mattresses executed by the control unit. The control unit 61 performs air exhaust for the leg air mattresses 50 when the angle sensor 76 detects that the position has been changed from the bed position to the seated position.

[0046] The storage unit 61a of the control unit 61 stores an intake / exhaust control program and a second threshold value αy of the angle sensor 76 shown in Fig. 10. The control process shown in Fig. 10 is repeatedly executed after the automatic mode is set. Each step is indicated by "S."

[0047] In S11, the control unit 61 obtains the detection value α1 of the angle sensor 76. That is, the control unit 61 obtains the angle of the back air mattress 40 relative to the seat air mattress 30 transmitted from the angle sensor 76.

[0048] In the next step S12, it is determined whether the detection value α1 of the angle sensor 76 is equal to or greater than a second threshold value αy. The second threshold value αy is, for example, a value greater than the first threshold value αx. For example, if the angle of the backrest 102 of the wheelchair 100 can be changed in stages, the second threshold value αy is the angle of the back air mattress 40 relative to the seat air mattress 30 when the backrest 102 is in the most upright seated position. The second threshold value αy is set to a value between 225 degrees and 230 degrees, for example. The second threshold value αy may be the same value as the first threshold value αx.

[0049] If S12 returns "YES," that is, if it is determined that the detection value α1 of the angle sensor 76 is equal to or greater than the second threshold value αy, the process proceeds to S13. On the other hand, if S12 returns "NO," that is, if it is determined that the detection value α1 of the angle sensor 76 is less than the second threshold value αy, the process ends.

[0050] In S13, the leg air mattress 50 is vented. That is, the control unit 61 opens the vent valve of the solenoid valve unit 62 connected to the air cell 51 of the leg air mattress 50, and the process ends. For example, when the detection value α1 for venting the first air cell 41a is the first threshold value αx (200 degrees to 220 degrees), the air cell 51 of the leg air mattress 50 does not vent because the user's heels are supported by the leg air mattress 50. From this point on, when the backrest 102 approaches the seated position and the second threshold value αy reaches, for example, 225 degrees to 230 degrees, the support changes from the heels to the soles of the user, and the control unit 61 vents the leg air mattress 50. As a result, as shown in FIG. 6, when the bed position is changed to the seated position, the air cell 51 of the leg air mattress 50 becomes as thin as possible.

[0051] The air cells 51 of the leg air mattress 50 have a different shape from the air cells 31 of the seat air mattress 30 and the air cells 41 of the back air mattress 40. As shown in Figures 7 and 8, the air cells 51 are formed by two oval-shaped bags connected in the vertical direction.

[0052] Specifically, the air cell 51 has a support portion 52 that is placed on the footrest portion 103 and step portion 104 of the wheelchair 100, a first folded portion 53 that is folded inward from the support portion 52, a second folded portion 54 that is folded outward from the first folded portion 53, and a support portion 55 that is connected to the second folded portion 54 and supports the user's feet.

[0053] As shown in Fig. 7, when the air cell 51 is filled with air, it becomes thick enough to support the user's foot and has cushioning properties. On the other hand, as shown in Fig. 8, when the air inside the air cell 51 is exhausted, the air cell 51 contracts so that the first folded portion 53 and the second folded portion 54 come into contact with each other, thereby making the thickness as thin as possible.

[0054] As a result, when the air inside the air cells 51 of the leg air mattress 50 is exhausted, the user can easily place their feet on the footrest 103 and step 104 of the wheelchair 100. As a result, for example, when the wheelchair 100 is in a seated position, the user can easily get on and off the wheelchair 100.

[0055] FIG. 11 is a flowchart showing the air supply and exhaust control of the air mattress unit executed by the control unit. When the angle sensor 76 detects that the seated position has been changed to the bed position, the control unit 61 maximizes the internal pressure of the air mattress unit 20.

[0056] The storage unit 61a of the control unit 61 stores an intake / exhaust control program and the third threshold value αz of the angle sensor 76 shown in Fig. 11. The control process shown in Fig. 11 is repeatedly executed after the automatic mode is set. Each step is indicated by "S."

[0057] In S21, the control unit 61 obtains the detection value α1 of the angle sensor 76. That is, the control unit 61 obtains the angle of the back air mattress 40 relative to the seat air mattress 30 transmitted from the angle sensor 76.

[0058] In the next step S22, it is determined whether the detection value α1 of the angle sensor 76 is less than a third threshold value αz. The third threshold value αz is, for example, the angle of the back air mattress 40 relative to the seat air mattress 30 in the bed position. In other words, the third threshold value αz is approximately 180 degrees. The third threshold value αz may be the same value as the first threshold value αx and the second threshold value αy.

[0059] If S22 returns "YES," that is, if it is determined that the detected value α1 of the angle sensor 76 is less than the third threshold value αz, the process proceeds to S23. On the other hand, if S22 returns "NO," that is, if it is determined that the detected value α1 of the angle sensor 76 is equal to or greater than the third threshold value αz, the process ends.

[0060] In S23, the internal pressure of the air mattress unit 20 is maximized. That is, the control unit 61 opens all the solenoid valves of the solenoid valve unit 62 and activates the blower unit 65. When the detection value of the air pressure sensor 66 reaches a specified maximum value, the control unit 61 closes the solenoid valves and stops the operation of the blower unit 65, thereby ending the process.

[0061] In this way, when the wheelchair 100 is placed in the bed position, the seat air mattress 30, back air mattress 40, and leg air mattress 50 of the wheelchair air mattress 10 automatically inflate to their maximum. Then, the caregiver can lower the handrail 120 of the wheelchair 100 to transfer the user between the bed and the wheelchair 100. In this case, because the internal pressure of the air mattress unit 20 is at its maximum, the user's body does not sink in as much, making it easier to transfer.

[0062] Here, the control unit 61 of the wheelchair air mattress 10 controls the air supply / exhaust of each air mattress unit 20 based on the detection value of the angle sensor 76. Therefore, when the user (operator or caregiver) starts to change position, control of the air mattress unit 20 is automatically started, eliminating the need for the caregiver to operate the air supply and exhaust of the air mattress unit, thereby improving the usability of the wheelchair air mattress 10.

[0063] Furthermore, if the wheelchair 100 is not equipped with an angle sensor for detecting position, it is possible to measure the internal pressure of the air mattress unit 20, estimate the position of the wheelchair 100, and control the air supply / exhaust of the air mattress unit. In this case, the accuracy of detecting position changes is lower and the detection time is longer until the internal pressure stabilizes, compared to when the position is actually determined using the angle sensor 76. According to this embodiment, detecting the position using the angle sensor 76 makes it possible to speed up the response speed of the air supply / exhaust control of the air mattress unit 20.

[0064] 9 to 11 may be executed together or individually. Also, the operation unit 70 may be configured to allow selection of which of the air intake and exhaust controls shown in FIGS. 9 to 11 to execute.

[0065] Furthermore, the wheelchair air mattress 10 may vary the body pressure at specific locations of the user's body by periodically inflating and deflating each of the air cells 31, 41, and 51. This can prevent the user of the wheelchair 100 from developing bedsores.

[0066] Embodiments may include the following features. (Configuration 1) an air mattress unit to be placed on a wheelchair that can be changed between a seated position and a bed position; a blower that supplies air to the air mattress unit; an electromagnetic valve unit located between the air mattress unit and the blower; a control unit that controls the operation of the blower unit and the operation of the solenoid valve unit; an angle sensor capable of detecting the position; Equipped with The air mattress for a wheelchair is characterized in that the control unit controls the operation of the blower unit and the operation of the solenoid valve unit based on the detection value of the angle sensor. (Configuration 2) The air mattress unit comprises: a seat air mattress placed on the seat of the wheelchair; a back air mattress placed on the back of the wheelchair; and The back air mattress is a first air cell located behind the seat air mattress; a second air cell located behind the first air cell; and The air mattress for a wheelchair described in configuration 1 is characterized in that the control unit executes exhaustion of the first air cell when the detection value of the angle sensor becomes equal to or greater than a first threshold value. (Configuration 3) The air mattress unit comprises: a seat air mattress placed on the seat of the wheelchair; a back air mattress placed on the back of the wheelchair; a leg air mattress placed on the foot rest and step of the wheelchair; and The air mattress for a wheelchair described in configuration 1 or 2 is characterized in that the control unit performs air exhaust for the leg air mattress when the detection value of the angle sensor becomes equal to or greater than a second threshold value. (Configuration 4) The leg air mattress unit is a resting portion to be placed on the footrest portion and the step portion of the wheelchair; a first folded portion folded inward from the placing portion; a second folded portion folded outward from the first folded portion; a support portion connected to the second folded portion and supporting the user's foot; 4. The air mattress for a wheelchair according to claim 3, characterized in that: (Configuration 5) An air mattress for a wheelchair described in any one of configurations 1 to 3, characterized in that the control unit maximizes the internal pressure of the air mattress unit when the detection value of the angle sensor becomes less than a third threshold value.

[0067] Although several embodiments of the present invention have been described, these embodiments are presented as examples and are not intended to limit the scope of the invention. These embodiments can be implemented in various other forms, and various omissions, substitutions, and modifications can be made without departing from the spirit of the invention. These embodiments and their modifications are included within the scope and spirit of the invention, as well as within the scope of the invention described in the claims and their equivalents. [Explanation of symbols]

[0068] 10. Wheelchair air mattress 15 Cover 20 air mattress units 21 Back side 30 Seat air mattress 31 Air Cell 32 bands 40 Back Air Mattress 41 Air Cell 41a First air cell 41b Second air cell 42 bands 50 Leg Air Mattress 51 Air Cell 51a Supply and exhaust section 52 Placement section 53 1st turning section 54 2nd turning section 55 Support part 60 Pump Unit 61 Control Unit 61a Storage section 62 Solenoid valve unit 65 Blower 66 Air pressure sensor 67 Pipeline 70 Operation section 75 Battery 76 Angle Sensor 80 tubes 100 wheelchairs 101 Seat part 102 Backrest 103 Footrest 104 Step section 110 Handle 120 Handrail

Claims

1. an air mattress unit to be placed on a wheelchair that can be changed between a seated position and a bed position; a blower that supplies air to the air mattress unit; an electromagnetic valve unit located between the air mattress unit and the blower; a control unit that controls the operation of the blower unit and the operation of the solenoid valve unit; an angle sensor capable of detecting the position; Equipped with The air mattress for a wheelchair is characterized in that the control unit controls the operation of the blower unit and the operation of the solenoid valve unit based on the detection value of the angle sensor.

2. The air mattress unit comprises: a seat air mattress placed on the seat of the wheelchair; a back air mattress placed on the back of the wheelchair; and The back air mattress is a first air cell located behind the seat air mattress; a second air cell located behind the first air cell; and 2. The air mattress for a wheelchair according to claim 1, wherein the control unit executes the exhaust of the first air cell when the detected value of the angle sensor becomes equal to or greater than a first threshold value.

3. The air mattress unit comprises: a seat air mattress placed on the seat of the wheelchair; a back air mattress placed on the back of the wheelchair; a leg air mattress placed on the foot rest and step of the wheelchair; and 2. The air mattress for a wheelchair according to claim 1, wherein the control unit vents the leg air mattress when the detected value of the angle sensor becomes equal to or greater than a second threshold value.

4. The leg air mattress unit is a resting portion to be placed on the footrest portion and the step portion of the wheelchair; a first folded portion folded inward from the placing portion; a second folded portion folded outward from the first folded portion; a support portion connected to the second folded portion and supporting the user's foot; 4. The air mattress for a wheelchair according to claim 3, further comprising:

5. 2. The air mattress for a wheelchair according to claim 1, wherein the control unit maximizes the internal pressure of the air mattress unit when the detection value of the angle sensor becomes less than a third threshold value.

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