User detection system, sensor device including the user detection system, and bed having the user detection system

Abstract

A user detection system may be post-mounted to a bed not equipped with the system and may then be removed. The user detection system is a system for detecting a state of a user on a bed, comprising: a plurality of sensor devices for detecting a load of the user; and a monitoring control device electrically connected to the plurality of sensor devices for receiving signals from the plurality of sensor devices to detect a user state. The user detection system is configured to be removably mounted on a bed, and each sensor device is removably suspended below a floor of the bed. Each sensor device has a pressure receiving portion pressed by a load of a user, and the pressure receiving portion is inserted into the vent hole of the bottom plate.

Description

Technical Field

[0001] The present invention relates to a system for a bed having multiple movable sub-base plates for detecting user status, such as the user leaving the bed or their position on the bed, a sensor device included in the system, and a bed including the system. Background Technology

[0002] The relevant technologies are disclosed in patent documents 1 to 4.

[0003] In the bed device disclosed in Patent Document 1, three pressure sensor units installed at both ends and the center in the width direction on the back panel and three pressure sensor units installed at both ends and the center in the width direction on the fixed plate are used to determine whether the user's position on the bed is normal supine, in danger of falling, off the bed, on the bed, or has fallen.

[0004] In the user position detection device disclosed in Patent Document 2, multiple bag-shaped units are respectively arranged in the width and longitudinal directions of the air cushion, and the user's position on the air cushion is calculated by detecting the air pressure difference between adjacent bag-shaped units.

[0005] In the bed-off detection device disclosed in Patent Document 3, a strip sensor corresponding to the user's shoulders, waist, and feet is provided in the gap between multiple butterfly springs supporting the lower surface of the mattress and the mattress, along the width direction of the bed. The strip sensor includes a tactile switch, and the presence / absence of a person on the mattress and changes in position are detected by using the output of the tactile sensor.

[0006] In the panel for measuring bio-information in Patent Document 4, the panel is provided on the surface of the bed and has an elastically bendable support plate portion. A strain gauge is provided on the support plate portion, and the user's bio-information is measured based on the output of the strain gauge corresponding to the vibration of the central part of the support plate portion.

[0007] [Existing technical documents] [Patent Document 1] Japanese Patent Application Publication No. 2008-100039 [Patent Document 2] Japanese Patent Application Publication No. 2017-000318 [Patent Document 3] International Publication No. 2012 / 053599 [Patent Document 4] Japanese Patent Application Publication No. 2005-253957 Summary of the Invention [The problem the invention aims to solve] The bed device described in Patent Document 1 is equipped with a user detection system by standard from the time of manufacture to detect the user's status, such as whether the user has left the bed or is in their body position on the bed. Such beds are more expensive than those without this system. However, the necessity of a user detection system varies from user to user. Furthermore, even for the same user, the need for such a system varies depending on their health condition, care environment, and other factors. Therefore, it would be more convenient to install such a system on a bed that is not equipped with one, or to remove it after use.

[0008] In this case, the installation and removal of the user detection system from the bed should be as simple as possible and can be completed in a short time.

[0009] According to the aforementioned prior art, the user detection system includes sensor devices that respond to the user's weight or body movements, and these sensor devices are disposed on the upper surface of the baseboard supporting the mattress. However, when the sensor devices protrude upwards from the upper surface of the baseboard due to their thickness, the protruding sensor devices may reduce the user's sleep comfort.

[0010] Most beds equipped with user detection systems are nursing or medical beds. Many of these beds also feature multiple movable subfloors that allow the user's posture to change when the subfloors are tilted, such as lying flat, with the upper body raised, or with the legs raised. The user detection system is also expected to be able to flexibly adapt to changes in the subfloor's posture, i.e., changes in the user's posture.

[0011] Users' body shapes vary from person to person. Furthermore, the length and width of the bed base also differ. The user detection system should be able to adapt to variations such as user body shape and bed base dimensions.

[0012] Therefore, one object of the present invention is to improve the convenience or adaptability of the user detection system for the bed.

[0013] [Problem-solving methods] The bed user detection system according to an embodiment disclosed in this specification includes: a plurality of sensor devices configured to sense the load of a user and emit signals based on the load; and a monitoring and control device configured to detect the user's state by receiving signals from the plurality of sensor devices. The user detection system is configured to be detachably mounted on the bed in a retrofittable manner. The plurality of sensor devices are detachably mounted at multiple different locations on a plan view of the bed base plate, suspended from the base plate.

[0014] According to one embodiment, the base plate has a plurality of through holes extending along the thickness direction of the base plate and serving as ventilation holes. Each sensor device includes a pressure-receiving portion that can be pressed by a user's load. With each sensor device mounted on the base plate, the pressure-receiving portion is inserted into the through hole from below; and each sensor device is configured to sense the user's load by pressing the pressure-receiving portion in the through hole through a mattress placed on the base plate.

[0015] According to one embodiment, when each sensor device is installed on the base plate, the upper surface of the pressure-bearing part is at the same height as or lower than the upper surface of the base plate, so that the lower surface of the mattress enters the through hole due to the user's load, thereby pressing the upper surface of the pressure-bearing part of the mattress.

[0016] According to one embodiment, the number of through holes in the base plate is greater than the number of sensor devices. By changing the through hole into which the pressure part of each sensor device is inserted, the mounting position of each sensor device on the base plate can be changed.

[0017] According to one embodiment, the base plate has a mesh structure, and the plurality of grids of the mesh structure serve as the plurality of through holes. User detection system according to claim 2 or 3.

[0018] According to one embodiment, the base plate is a flat plate made of metal or resin, the flat plate having a plurality of vent holes, the plurality of vent holes serving as the plurality of through holes.

[0019] According to one embodiment, the system further includes a fastener for detachably mounting the sensor device to the base plate, the fastener being configured to allow an operator to secure the sensor device to the base plate using screws or by one-touch fastening.

[0020] According to one embodiment, the fastener has a snap-fit ​​connection structure, allowing the operator to fix the sensor device to the base plate with a single click.

[0021] According to one embodiment, the upper surface of the fastener is located at the same height as or below the upper surface of the base plate.

[0022] According to one embodiment, the user detection system includes eight sensor devices. When a user lies supine on the bed with their body straight and aligned with their height along the length of the bed, the floor is divided into four regions, each bearing loads from four parts: the user's upper back, the waist (from the lower back to the hips), the upper part of the lower limbs (from the thighs to the knees), and / or the lower part of the lower limbs (from the calves to the feet). In each of the four regions of the floor, any two of the eight sensor devices are installed; and the two sensor devices installed in each region of the floor are respectively located in a first half-region extending from the center of the width direction of each region to one end of the width direction, and in a second half-region extending from the center of the width direction of each region to the other end of the width direction.

[0023] According to one embodiment, the base plate includes four key base plates: a back base plate supporting the user's upper back, a lumbar base plate supporting the area from the user's lower back to the hips, a knee base plate supporting the upper part of the lower limbs from the user's thighs to the knees, and a foot base plate supporting the lower part of the lower limbs from the user's calves to the feet. The back base plate, the knee base plate, and the foot base plate have variable angles relative to the horizontal plane. The user detection system includes eight sensor devices, with any two of the eight sensor devices mounted on each of the four key base plates. The two sensor devices mounted on each key base plate are respectively located in a first half-region extending from the center of the width direction of each key base plate to one end in the width direction, and in a second half-region extending from the center of the width direction of each key base plate to the other end in the width direction.

[0024] Each sensor device includes a support and a lever cover disposed on the upper side of the support. The lever cover includes a fulcrum supported by the support and an extension extending from the fulcrum in one direction in a plan view. The extension is rotatable about the fulcrum in a vertical direction and elastically elevates from the support. The lever cover has a pressure-bearing portion on the upper part of the extension. Each sensor device is arranged such that the direction in which the extension extends is along the width direction of the base plate, and in a plan view, the pressure-bearing portion is located closer to the center of the width direction of the base plate than the fulcrum.

[0025] According to one embodiment, each sensor device includes a cushioning pad disposed below an extension of the lever cover; and a pressure sensor disposed above the support and below the cushioning pad. When the pressure-bearing portion is pressed down by a user's load, the lever cover descends, applying pressure to the pressure sensor through the cushioning pad, and the pressure sensor outputs a signal corresponding to the pressure.

[0026] According to one embodiment, the base plate has two or more through holes arranged at different positions along its width. The sensor device includes two or more pressure-receiving parts disposed on the upper part of the extension, the pressure-receiving parts being arranged at different positions along a direction extending from the extension in a plan view. When the sensor device is mounted on the base plate, the two or more pressure-receiving parts are respectively inserted into the two or more through holes provided in the width direction of the base plate.

[0027] According to one embodiment, the lever cover of each sensor device covers the entire area of ​​the upper side of the support from above.

[0028] According to one embodiment, the monitoring and control device is disposed on the lower side of the waist base plate.

[0029] According to one embodiment, the bed includes a floor drive system for driving the one or more key floor plates. The monitoring and control device is connected to the floor drive system and detects the user's status based on signals from multiple sensor devices and signals from the floor drive system regarding the driving of the key floor plates.

[0030] According to one embodiment, each of the plurality of sensor devices includes a pressure-receiving portion pressed by the user's load and a pressure sensor for detecting the user's load via the pressure-receiving portion. The pressure-receiving portion is inserted into a through-hole extending through the base plate in the thickness direction. Each sensor device is configured to detect the user's load by pressing the pressure-receiving portion.

[0031] According to one embodiment, the bed includes a mattress placed on the base plate. When the mattress expands into the through-holes under the user's load, the pressure-bearing portion is pressed down. Attached Figure Description

[0032] Figure 1 This is a perspective view of a bed equipped with the user detection system of this embodiment.

[0033] Figure 2 These are the floor plan (A), side view (B), and front view (C) of the bed.

[0034] Figure 3 This is a schematic diagram showing the bed's base in a movable state.

[0035] Figure 4 This is a configuration diagram of each unit of the user detection system.

[0036] Figure 5 This is a schematic diagram showing the sensor device installed on the critical base plate.

[0037] Figure 6 This is a 3D view of the sensor device.

[0038] Figure 7 It is along Figure 6 A cross-sectional view of line AA.

[0039] Figure 8 This is a schematic diagram of the configuration of the buffer material and pressure sensor in the sensor device.

[0040] Figure 9 This is a schematic diagram showing the sensor device installed on the mesh base plate.

[0041] Figure 10 It is a cross-sectional view of the sensor device mounted on the mesh base plate along the second direction.

[0042] Figure 11 This is a schematic diagram illustrating an example of the control flow of the monitoring and control device 6.

[0043] Figure 12 This is a schematic diagram of a modified example of a fastener.

[0044] Figure 13 This is a schematic diagram of the first modified example of the key base plate.

[0045] Figure 14 This is a schematic diagram of the second modified version of the key base plate.

[0046] Figure 15 This is a schematic diagram of the third variant of the key base plate.

[0047] Figure 16 This is a schematic diagram of the fourth variant of the key base plate.

[0048] Figure label: 1: Bed; 2: Base plate; 4: User detection system; 5: Sensor device; 6: Monitoring and control device; 7: Base plate drive system; 9: Nurse call system; 11: Base frame; 12: Central frame; 13: Head frame; 14: Foot frame; 15: Casters; 16: Lifting mechanism; 21: Backrest base plate; 21A: Upper backrest base plate; 21B: Lower backrest base plate; 21C: Backrest bending hinge; 23: Lumbar base plate; 24: Backrest lifting hinge; 25: Knee base plate; 26: Knee bending hinge; 27: Footrest base plate; 28: Knee lifting hinge; 31: Outer frame; 33A: Longitudinal line; 33B: Transverse line; 35: Through hole; 51: Support component; 51a: Bottom wall; 51b: Side wall; 51c: Top; 52: Lever cover; 52a: Top wall; 52b: Side wall. 52c: Base plate, 53: Support arm, 54: Fixing plate, 54a: Through hole, 56: Protrusion, 57: Groove, 58: Support rod, 58a: Lower end, 71: Pressure sensor, 72: Buffer material, 73: Helical spring, 90: Mobile communication terminal, 91: Sub-unit, 92: Main unit, 123: Waist base plate, 123a: First through hole, 123b: Second through hole, 153: Support arm, 153a: Locking hole, 154: Fixing plate, 155: Locking protrusion, 155a: Tip, 155b: Inclined surface, 223: Waist base plate, 223a: First through hole, 223b: Second through hole, 323: Waist base plate, 323a: First through hole, 323b: Second through hole, 423: Waist base plate, 423a: First through hole, 423b: Second through hole. Detailed Implementation

[0049] The following description of this embodiment will refer to the accompanying drawings. Figures 1 to 2 As shown, the bed 1 according to this embodiment is roughly rectangular in plan view.

[0050] In the following description, the term "length direction" refers to the direction along the long side of the rectangle of bed 1, "width direction" refers to the direction along the short side of bed 1, and "height direction" refers to the vertical direction when bed 1 is placed on a horizontal surface. Furthermore, "head direction" refers to the direction from the user's feet to their head when the user is lying supine on bed 1, "head side" refers to the side closest to the user's head, "foot direction" refers to the direction from the user's head to their feet, "foot side" refers to the side closest to the user's feet, and "front," "back," "left," and "right" refer to the directions or sides viewed from the user's perspective.

[0051] The bed 1 according to this embodiment includes a base frame 11, a central frame 12, a head frame 13, and a foot frame 14. The base frame 11 is generally rectangular in plan view and can be mounted on the ground by casters 15 (or fixed feet not shown) provided at its four corners.

[0052] The central frame 12, head frame 13, and foot frame 14 are mounted on the base frame 11. The head frame 13 is positioned on the head side of the central frame 12 to connect the two, and the foot frame 14 is positioned on the foot side of the central frame 12 to connect the two. In this way, the central frame 12, head frame 13, and foot frame 14 are interconnected to form a lifting frame 12, 13, 14 that is approximately rectangular as a whole in the plan view.

[0053] The lifting frames 12, 13, and 14 (e.g., the center frame 12) are connected to the lifting mechanism 16 mounted on the base frame 11 and can be raised and lowered in the height direction via the lifting mechanism 16.

[0054] A base plate 2 is provided on the lifting frames 12, 13, and 14. The base plate 2 is a roughly rectangular plate in plan view, used to support the mattress (not shown) placed on it. The base plate 2 includes multiple roughly rectangular flat key base plates (element boards), each positioned at a different location along its length. For example, these key base plates, from the head side to the leg side, are, in sequence, a back base plate 21, a lumbar base plate 23, a knee base plate 25, and a leg base plate 27.

[0055] Figure 3 This is a schematic diagram of the movable state of each key base plate. The back base plate 21 supports the user's upper body, for example, the back. The back base plate 21, for example, includes an upper back base plate 21A and a lower back base plate 21B disposed on the foot side of the upper back base plate 21A. The upper back base plate 21A and the lower back base plate 21B are rotatably connected to each other at the foot-side end of the upper back base plate 21A and the head-side end of the lower back base plate 21B via a back bending hinge 21C. The back base plates 21 (including the lower back base plate 21B) are rotatably connected to each other at their foot-side ends via a back lifting hinge 24 relative to the lifting frames 12, 13, and 14.

[0056] The upper back panel 21A supports the relatively high part of the user's upper body (for example, from the head to near the shoulder blades). The lower back panel 21B supports the relatively low part of the user's upper body (for example, from near the shoulder blades to the upper waist).

[0057] The back panel 21, for example, is connected to a back lifting mechanism (not shown) disposed in the lifting frames 12, 13, and 14, and can rotate as a whole around the back lifting hinge 24 via the back lifting mechanism, and can achieve various angle postures from a horizontal posture to a posture tilted forward at a predetermined angle. Therefore, the user's upper body can be raised or lowered. Figure 3 (A) and (B) show examples of changing the angle by rotating the back base plate 21.

[0058] The upper back plate 21A and lower back plate 21B of the back support plate 21 are connected to a back lifting mechanism (or an additional back bending mechanism), through which the upper back plate 21A can rotate relative to the lower back plate 21B about a back bending hinge 21C (rotation state not shown in the figure), and can adopt various postures from an upright posture to a posture of bending forward at a predetermined angle. Therefore, the posture of the user's upper body (spine) can be adjusted between an upright posture and a posture with a certain degree of forward tilt.

[0059] The position of the back bending hinge 21C connecting the upper back panel 21A and the lower back panel 21B is variable within a predetermined distance in the length direction. For example, it can be set to any of a number of different positions (not shown in the figure). In this way, the position of the back bending hinge 21C can be adjusted to adapt to the user's body shape, body characteristics, etc., that is, the position of the user's back bending.

[0060] The lumbar support plate 23 is used to support the user's buttocks, for example, the area from the lower back to the buttocks (lumbar region). For example, the lumbar support plate 23 is horizontally fixed to the lifting frame 12, 13, 14.

[0061] The knee plate 25 is used to support the user, for example, the area from the thigh to near the knee (the upper part of the lower limb). The knee plate 25 is rotatably connected to the lifting frames 12, 13, and 14 at its head-side end via a knee lifting hinge 28. For example, the knee plate 25 is connected to a knee lifting mechanism (not shown) disposed in the lifting frames 12, 13, and 14, and rotates about the knee lifting hinge 28 via the knee lifting mechanism, allowing it to assume various postures from a horizontal posture to a posture tilted forward at a predetermined angle. Thus, the user can raise their knee to bend the knee joint, or lower their knee to straighten the knee joint.

[0062] The foot plate 27 supports the area from near the user's knee to the foot (lower limb). The knee plate 25 and the foot plate 27 are rotatably connected to each other at the foot-side end of the knee plate 25 and the head-side end of the foot plate 27 via a knee bending hinge 26. The foot-side end of the foot plate 27 is slidably mounted on the lifting frames 12, 13, and 14 in the longitudinal direction. When the knee plate 25 rotates about the knee lifting hinge 28 via the knee lifting mechanism, the foot plate 27 also rotates about the knee bending hinge 26. Figure 3 (A) and (B) show examples of changing the angle by rotating the knee plate 25 and the foot plate 27.

[0063] Alternatively, the foot plate 27 can be connected to a foot lifting mechanism provided on the lifting frames 12, 13, 14, and the foot plate 27 can be rotated about the knee bending hinge 26 by the foot lifting mechanism (not shown) to adjust the height of the user's feet.

[0064] The position of the knee flexion hinge 26 in the longitudinal direction is variable within a predetermined distance range, and, for example, can be set to any of a number of different positions (not shown in the figure). Therefore, the position of the knee flexion hinge 26, i.e., the position of the user's knee flexion, can be adjusted to adapt to the user's body shape, body characteristics, etc.

[0065] Each of the back plate 21, waist plate 23, knee plate 25 and foot plate 27 may have a variable length and / or width dimension (although the specific structure of the variable dimensions is not shown in the figure, known techniques may be used).

[0066] Users or caregivers can use the control panel or remote control (not shown) located on bed 1 to control the posture of each key floorboard.

[0067] Key floor plates, such as the back plate 21, waist plate 23, knee plate 25, and foot plate 27, for example, each have a mesh structure. A mesh-like key floor plate typically includes: an outer frame 31, which is rectangular in plan view and relatively thick and rigid; multiple elongated longitudinal lines 33A extending at intervals along the length of the inner side of the outer frame 31; and multiple elongated transverse lines 33B extending at intervals along the width of the inner side of the outer frame 31. The longitudinal lines 33A and transverse lines 33B intersect to form a mesh structure. Such a mesh-like key floor plate has multiple grids (i.e., through-holes 35 penetrating the floor plate from the upper to the lower surface in the thickness direction), arranged in a matrix in both the length and width directions.

[0068] Bed 1 is also equipped with a user detection system 4, which includes multiple sensor devices 5.

[0069] The user detection system 4 for bed 1 according to this embodiment will be described below. Figure 4 This is a schematic diagram of the configuration of each unit of the user detection system 4. Figure 5 This is a schematic diagram showing the sensor device 5 installed on each key base plate (representatively shown as the back base plate 21).

[0070] According to this embodiment, the bed 1 does not require the user detection system 4 to be shipped from the factory. After shipment, the user detection system 4 can be installed on the bed 1 as an optional accessory, and can be detached later. Furthermore, after the user detection system 4 is temporarily installed on the bed 1, it can also be removed from the bed 1. The operation of installing and removing the user detection system 4 from the bed 1 is very simple. The operator can install and remove it by simply tightening or loosening the fixing screws with a screwdriver, or by simply pressing it lightly, and it can be completed in a short time.

[0071] The user detection system 4 has multiple (eight in the illustrated example) sensor devices 5 and at least one monitoring and control device 6 electrically connected to the sensor devices 5.

[0072] The monitoring and control device 6 can be electrically connected to the nurse call system 9. The nurse call system 9 will be described later.

[0073] The monitoring and control device 6 can also be electrically connected to several mechanisms for driving and controlling the posture of the base plate 2 of the bed 1, such as the back lifting mechanism, back bending mechanism, knee lifting mechanism, and the base plate drive control device 7 (in this embodiment, the base plate drive control device 7) which is composed of the aforementioned back lifting mechanism, back bending mechanism, knee lifting mechanism, and the base plate drive control device 7 for driving and controlling these mechanisms.

[0074] The eight sensor devices 5 have a basically the same structure, but may differ. Each sensor device 5 senses the load applied by the user to the upper surface of each key base plate through the mattress (not shown) and outputs an electrical signal corresponding to the load value. Their specific structures will be described later.

[0075] The following will refer to Figure 4 The following explanation is provided. Of the eight sensor devices 5, two sensor devices 5 are arranged as a pair, thus forming four pairs of sensor devices 5. In the plan view, these four pairs of sensor devices 5 are mounted on the base plate 2 in the following arrangement. With the user lying supine with their body extended along the longitudinal direction of their height on the bed 1, the four pairs of sensor devices 5 are mounted in four areas of the base plate 2. These four areas are used to bear the load from four parts: the user's upper back, the waist (from the lower back to the hips), the upper part of the lower limbs (from the thighs to the knees), and / or the lower part of the lower limbs (from the calves to the feet).

[0076] A pair of sensor devices 5, installed in each region of the base plate 2, are respectively located in the right half of each region of the base plate 2 from the center in the width direction to one end in the width direction, and in the left half of each region from the center in the width direction to the other end in the width direction. The pair of sensor devices 5 are spaced apart from each other, with the center of the base plate 2 located within this space. The sensor devices 5 are not positioned within this space.

[0077] Examples of these four pairs of sensor devices 5 are as follows: Figure 4 As shown. That is, four pairs of sensor devices 5 are respectively mounted on four key base plates: the back base plate 21, the waist base plate 23, the knee base plate 25, and the foot base plate 27. For example, the first pair of sensor devices 5(a), 5(a) are mounted on the back base plate 21, the second pair of sensor devices 5(b), 5(b) are mounted on the waist base plate 23, the third pair of sensor devices 5(c), 5(c) are mounted on the knee base plate 25, and the fourth pair of sensor devices 5(d), 5(d) are mounted on the foot base plate 27. Here, the first pair of sensor devices 5(a), 5(a) are preferably mounted on the lower back base plate 21B, which is the upper back base plate 21A and the lower back base plate 21B of the back base plate 21. This is because the lower back base plate 21B typically bears a greater load from the user than the upper back base plate 21A.

[0078] In this way, by arranging four pairs of sensor devices 5 (i.e., a total of eight sensor devices 5) on the base plate 2, the user's position and posture on the bed 1 can be appropriately detected. In other words, without using too many sensor devices 5, only eight sensor devices 5, that is, an appropriate number that is neither too many nor too few, are sufficient to determine with practically sufficient resolution whether the user's state is normal, requires attention, or is dangerous. Furthermore, as described above, by arranging four pairs of sensor devices 5 (i.e., a total of eight sensor devices 5) on the base plate 2, even when the posture of the base plate 2 becomes a non-horizontal bent posture due to base plate drive such as raising the back or knees, it is possible to determine whether the user's state is normal, requires attention, or is dangerous.

[0079] In the plan view, each pair of sensor devices 5 can be positioned approximately symmetrically to the center line CL in the width direction of each key base plate. For example, one sensor device 5(a) in the first pair can be positioned between a predetermined distance to the left of the center line CL in the width direction of the back base plate 21 and the left end of the back base plate 21, while the other sensor device 5(a) can be positioned symmetrically to its right.

[0080] Similarly, the other three pairs of sensor devices 5 can also be arranged in a linearly symmetrical position to the left and right of the center line CL in the width direction of each key base plate. Furthermore, depending on the user's body size, behavior patterns, or other environmental conditions, each pair of sensor devices 5 can be arranged in a position slightly off-line symmetry along the length or width direction, rather than in the linearly symmetrical position described above.

[0081] The following will refer to Figure 5 To illustrate. For example, such as Figure 5As shown in (A) and 5(C), the distance (spacing) between the first pair of sensor devices 5(a) and 5(a) in the width direction of the base plate 2 can be changed, that is, the distance from the center line CL to each sensor device 5(a) and 5(a) can be changed. Furthermore, as... Figure 5 As shown in (A) and (B), the longitudinal position of the first pair of sensor devices 5(a), 5(a) on the back panel 21 can also be variable. That is, the position of the sensor devices 5(a), 5(a) on each key panel can be appropriately adjusted according to the patient's body size and condition (e.g., illness). It should be noted that, for the sake of simplicity, only the first pair of sensor devices 5(a), 5(a) are described above, but it is self-evident that this also applies to all sensor devices 5 included in the user detection system 4.

[0082] Back Figure 4 The monitoring and control device 6 is disposed in the empty space below the base plate 2. For example, the monitoring and control device 6 can be disposed in the empty space below the waist base plate 23. This is because it is easy to form an empty space suitable for storage below the waist base plate 23, and the waist base plate 23 is relatively fixed and does not rotate, thus facilitating storage. Furthermore, in this way, the monitoring and control device 6 and all (eight in the illustrated example) sensor devices 5 are arranged at appropriate distances. For example, when the monitoring and control device 6 and each sensor device 5 are connected by wires (in the illustrated example, the wiring is indicated by dashed lines), the wiring can be easily organized, and the length of the wiring does not need to be extremely long or extremely short; it only needs to be set to approximately the same length. In addition, the monitoring and control device 6 can be accommodated in another empty space of the base plate 2, or in another location such as next to the bed 1.

[0083] <Structure of Sensor Device> Next, the structure of sensor device 5 will be described with reference to the accompanying drawings. Figure 6 This is a 3D view of sensor device 5. Figure 7 It is along Figure 6 A cross-sectional view of line AA. Figure 8 This is a schematic diagram of the configuration of the buffer material 72 and the pressure sensor in the sensor device 5. Figure 9 This is a schematic diagram showing the sensor device 5 installed on the key base plate (waist base plate 23) of the mesh structure. Figure 10 This is a cross-sectional view of the sensor device 5 mounted on the base plate 2 of the mesh structure along the second direction.

[0084] The sensor device 5 is generally slender and roughly rectangular in shape. In the following description, the term "first direction" refers to the longitudinal direction in the plan view of the sensor device 5, while "second direction" refers to the transverse direction (short side direction) in the plan view of the sensor device 5.

[0085] The sensor device 5 is mounted on any key base plate of the bed 1 with its first direction aligned with the width direction of the bed 1.

[0086] The sensor device 5 includes a support member 51 and a lever cover 52. For example, both the support member 51 and the lever cover 52 are elongated, approximately rectangular rectangular boxes. For example, the support member 51 is a box having a bottom wall 51a, side walls 51b, and an open top 51c without a top wall. For example, the lever cover 52 is a box having a top wall 52a, side walls 52b, and an open bottom plate 52c without a bottom wall. The lever cover 52 is larger than the support member 51 in both the first and second directions. The portion of the support member 51, including the open top 51c, is completely contained within the opening of the bottom plate 52c of the lever cover 52, and the upper part of the open top 51c and its surrounding side walls 51b of the support member 51 is externally covered by the top wall 52a and its surrounding side walls 52b of the lever cover 52.

[0087] The support member 51 has four support arms 53, which extend outward a certain distance in a second direction from two positions on two sides near one end and two positions on two sides near the other end in a first direction. The four support arms 53 serve as part of the fixing members for mounting the sensor device 5 to the key base plate.

[0088] That is, each of the four support arms 53 has an internally threaded hole formed downwards from its upper surface. Additionally, as another part of the fastener, two fixing plates 54 are provided. One fixing plate 54 is connected to the two support arms 53 extending from two sides near one end, and has through holes 54a at two positions corresponding to the internally threaded holes (not shown) of the two support arms 53. The other fixing plate 54 is connected to the two support arms 53 extending from two sides near the other end, and has through holes 54a at two positions corresponding to the internally threaded holes of the two support arms 53.

[0089] The lever cover 52 of the sensor device 5 has protrusions 56 as pressure-receiving portions pressed by a user's load. Specifically, for example, the lever cover 52 has a plurality of platform-shaped (i.e., platform shapes with flat upper surfaces) protrusions (pressure-receiving portions) 56 arranged side by side in a first direction on the upper part of the top wall 52a. Each protrusion 56 is square or rectangular in plan view, and the shape is selected to allow it to be inserted from below and accommodated in each grid (through hole 35) of the key base plate. A groove 57 is provided adjacent to each protrusion 56 on the upper part of the top wall 52a of the lever cover 52. The width and depth of each groove 57 are selected to accommodate the longitudinal line 33A or transverse line 33B forming each grid of the key base plate.

[0090] Thus, a plurality of platform-shaped protrusions 56 arranged in the first direction of the lever cover 52 of the sensor device 5 are accommodated inside a plurality of grids (through holes 35) arranged in the width direction of the key base plate. Furthermore, the upper surfaces of these protrusions (pressure-bearing portions) 56 are located at a height equal to or lower than the upper surface of the key base plate, i.e., in this embodiment, at the upper surface of the longitudinal line 33A on the transverse line 33B. For example, preferably, the height of the upper surface of the protrusion 56 is equal to or slightly lower than the height of the upper surface of the longitudinal line 33A (e.g., a fraction of a millimeter). Therefore, the upper surface of the sensor device 5 does not protrude above the upper surface of the key base plate. Therefore, the sensor device 5 does not affect the user's sleep comfort. On the other hand, when the user's load is applied to the mattress (not shown) on the base plate, the mattress enters the grid (through holes 35) of the key base plate and expands downward, thereby pressing down on the protrusions 56 of the lever cover 52. Therefore, the load generated by the user's weight is applied from the mattress to the lever cover 52 of the sensor device 5. The sensor device 5 can detect this load. Furthermore, the upper surface of the fastener should preferably not protrude from the upper surface of the base plate. Specifically, the height of the upper surface of the fastener 54 should preferably be equal to or lower than the upper surface of the key base plate. This is also to prevent the installation method of the sensor device 5 from adversely affecting the user's sleep comfort.

[0091] The internal structure of the sensor device 5 used for detecting the load will be described below.

[0092] For example, such as Figure 7 As shown, the sensor device 5 includes a pressure sensor 71, a cushioning material 72, and an elastic member located between the support member 51 and the lever cover 52.

[0093] The lever cover 52 has a downwardly projecting support rod 58 near one end of the lower surface of the top wall 52a in a first direction. The lower end 58a of the support rod 58 abuts against a certain position of the bottom wall 51a of the support member 51. Furthermore, an elastic member, for example a coil spring 73, is inserted between a certain position near the other end of the top wall 52a of the lever cover 52 in the first direction and that position of the bottom wall 51a of the support member 51 directly below that position. The coil spring 73 lifts the lever cover 52 upward and elastically supports it. Thus, in the lever cover 52, in plan view, the extension 59 extending from the lower end 58a of the support rod 58 in the first direction to the other end does not directly contact the support member 51, but floats above it. Therefore, the lever cover 52 is supported on the support member 51 in a seesaw-like up-and-down swinging state with the lower end 58a of the support rod 58 as a fulcrum.

[0094] The pressure sensor 71 is positioned between the fulcrum (lower end 58a in the example in the figure, the same below) in the first direction on the upper surface of the bottom wall 51a of the support member 51 and the elastic member (coil spring 73 in the example in the figure, the same below).

[0095] For example, such as Figure 8 As shown, a cushioning material 72 is inserted between the upper surface of the pressure sensor 71 and the lower surface of the top wall 52a of the lever cover 52. For example, the cushioning material 72 can be fixed to the lower surface of the top wall 52a of the lever cover 52 by adhesive or other means, or it can be fixed above the pressure sensor 71 on the support 51 side, or it can be inserted by the user between the upper surface of the pressure sensor 71 and the lower surface of the top wall 52a of the lever cover 52 without being fixed to any component.

[0096] For example, pressure sensor 71 is a flat, thin plate mounted on the bottom wall 51a of support 51, which converts the pressure applied to its upper surface into an electrical signal with a value corresponding to the pressure and outputs it. The output signal of pressure sensor 71 is input to monitoring and control device 6.

[0097] A cushioning material 72 is located between the lever cover 52 and the pressure sensor 71 to reduce the mechanical impact applied to the pressure sensor 71 by the lever cover 52. For example, the cushioning material 72 is made of a soft, elastic material such as silicone rubber.

[0098] When a load is applied from top to bottom to any of the protrusions 56 of the extension 59 of the lever cover 52 of the sensor device 5 thus configured, the extension 59 of the lever cover 52 rotates about a fulcrum and descends, thereby pressing the pressure sensor 71 through the cushioning material 72. The pressure sensor 71 provides an electrical signal with a value corresponding to the pressing force to the monitoring and control device 6. When the pressure applied to the pressure sensor 71 is removed, the lever cover 52 returns to its original position under the action of an elastic member (for example, a coil spring 73), and the output signal from the pressure sensor 71 indicates that the pressure is zero. Furthermore, Figure 8 The elastic component was omitted.

[0099] The sensor device 5 is capable of detecting loads applied by the user at any location (i.e., any one of the plurality of protrusions 56) within the width direction of the bed 1, covering almost the entire length of the first direction. Despite the wide detectable width direction range, the cost is low because only one pressure sensor 71 is required for each sensor device 5.

[0100] The sensor device 5 is mounted on the base plate 2 with the point of action of the lever cover 52 (the part that presses the pressure sensor 71) located near the center of the width direction of the key base plate (i.e., close to the center line CL), and the fulcrum of the lever cover 52 located near the right or left end of the base plate 2 (i.e., away from the center line CL).

[0101] The sensor device 5 is mounted on the base plate 2 in this manner, which allows for more reliable detection of the user's position on the base plate 2 compared to the reverse installation. This is because the user is typically located near the center of the base plate 2. Therefore, in the lever cover 52 of the sensor device 5 mounted in the above manner, the load from the user is often applied to a position relatively far from the fulcrum, i.e., close to the center of the base plate 2. Since the travel distance of the lever cover 52 required to trigger the pressure sensor 71 is relatively long at a relatively far point from the fulcrum, the reliability of load detection is also relatively good.

[0102] The monitoring and control device 6 receives output signals from eight sensor devices 5 and output signals from the base plate drive control device 7 to estimate and determine the user's state on the bed 1. For example, the user's state to be determined includes whether the user is lying supine on the bed 1 or has raised their upper body, whether they are sitting on the edge of the base plate 2 in the width direction (edge ​​sitting position), whether they are sleeping near the edge of the bed 1 in the width direction (whether there is a risk of falling off the bed), whether they stand up and leave the bed 1 (leaving the bed), and whether the state of leaving the bed lasts for a long time, etc.

[0103] In addition, it is possible to determine, for example, whether the user's upper body leans to the right, left, or forward when the backrest 21 is upright, or whether the user's buttocks slide forward off the lumbar support 23 when the backrest 21 moves from the sleeping position to the upright position. The changes in the user's state to be determined can be different from the changes described above, or they can be greater or less than the changes described above.

[0104] Alternatively, the monitoring and control device 6 may not be connected to a base plate drive system such as the base plate drive control device 7, and it may not need to consider the angle or movement of the base plate 2 to make a judgment.

[0105] The monitoring and control device 6 can send a signal corresponding to the estimated result of the user's status to the nurse call system 9 via wired or wireless communication, thereby notifying the nurse or nursing staff of information useful for the user's care (for example, whether the user is lying normally on the bed 1, whether there is a risk of falling off the bed 1, whether the user is in bed, whether the body is abnormally tilted when the upper body is raised, etc.).

[0106] For example, the nurse call system 9 includes a sub-unit 91 installed near the bed 1 and a main unit 92 installed at the nurse station, etc. The nurse call system 9 can be connected to a mobile communication terminal 90 carried by nurses or nursing staff, and its specific configuration can vary. In the example shown in the attached figure, the monitoring and control device 6 is connected to the sub-unit 91 of the nurse call system 9, and signals from the monitoring and control device 6 are sent to the main unit 92 through the sub-unit 91.

[0107] Figure 11 This is an example of the control flow of monitoring and control device 6. It will be explained below.

[0108] The monitoring and control device 6 receives signals from the eight sensor devices 5 and, based on the input signals, understands the load distribution of the user on the base plate 2 (for example, which sensor device 5 the user's load is applied to, i.e., which key base plate and which position, or the magnitude of the pressure applied to each sensor device 5, etc.) (S1).

[0109] In addition, the monitoring and control device 6 receives signals output from the base plate drive control device 7 and grasps the attitude of the base plate 2 based on the input signals (for example, various attitudes determined by the combination of the tilt of multiple key base plates, and the transition action from one attitude to another, etc.) (S2).

[0110] Next, the monitoring and control device 6 makes a speculative judgment on whether the user is currently in the bed 1 based on the load distribution and the posture of the base plate 2 (S3).

[0111] Next, based on the determination result of S3, the monitoring and control device 6 sends predetermined information or signals to the nurse call system 9 or mobile communication terminal 90 as needed (S4).

[0112] The monitoring and control device 6 repeats the above steps (S1 to S4).

[0113] <Installation of sensor devices on the bed> When sensor device 5 is installed on the critical base plate, the following operations can be performed.

[0114] The sensor device 5 is positioned by the operator on the underside of the critical base plate, with the upper surfaces of its four support arms 53 abutting against the lower surfaces of the two transverse lines 33B of the critical base plate. Two fixing plates 54 are positioned on the upper side of the critical base plate, abutting against the upper surfaces of the two transverse lines 33B. Four fixing screws (not shown) are then inserted from above into the four through holes 54a of the two fixing plates 54, and these screws are then inserted into the internal threaded holes (not shown) of the four support arms 53. The operator then tightens the fixing screws with a screwdriver. In this way, the two transverse lines 33B of the critical base plate are securely clamped between the two fixing plates 54 and the four support arms 53, and the sensor device 5 is securely fixed to the critical base plate in a suspended manner.

[0115] This installation can be easily completed by the operator using only a screwdriver, and can also be done in a short time.

[0116] The thickness of the fixing plate 54 is preferably such that the upper surface of the fixing plate 54 is not higher than the upper surface of the key base plate (i.e., at the same or slightly lower position as the upper surface of the key base plate).

[0117] <Variations on sensor devices and fixtures> The following describes a variation of the fastener. Figure 12 This is a schematic diagram illustrating one variation of the fastener. To further simplify the fastening operation, the fastener can employ, for example, a snap-fit ​​connection structure as described below. Here, a snap-fit ​​connection structure refers to a connection structure utilizing elastic members, wherein when the interlocking parts are in a separated state, the connection of the interlocking parts can be completed by manually pushing or pulling a part of the structure in one direction. An example of a snap-fit ​​connection structure is described below, wherein when two members approach each other in one direction, at least one member elastically deforms and engages with the other member, and after engagement, the deformed member elastically returns to its original shape and remains engaged.

[0118] The fastener in this embodiment includes two locking protrusions 155, for example, the two locking protrusions 155 extending downward from the lower surface near both ends of the fixing plate 154. The locking protrusions 155 are elastic; when subjected to a force that causes them to bend, the locking protrusions 155 bend, and when the force is removed, the locking protrusions 155 return to their original straight shape. The tip 155a of the locking protrusion 155 has a jaw-like tip that tapers gradually, such as a harpoon or a barb. The outer surface of the jaws of the tip 155a of the locking protrusion 155 has an inclined surface 155b that is inclined relative to the extending direction of the locking protrusion 155. A locking hole 153a extending vertically is provided near the tip of each support arm 153. The shape and size of each locking hole 153a allow it to be inserted into the tip 155a of each locking protrusion 155.

[0119] The spacing between the two locking protrusions 155 and the spacing between the two locking holes 153a can be appropriately selected. This allows the fixing plate 154 to engage with the support arm 153 in the following manner.

[0120] That is, when the operator places the fixing plate 154 directly above the two support arms 153 and lowers the fixing plate 154 toward the support arms 153, the tips 155a of the two locking protrusions 155 of the fixing plate 154 enter the two locking holes 153a of the two support arms 153, and the inclined surfaces 155b of the tips 155a of the two locking protrusions 155 contact the inner surfaces of the two locking holes 153a respectively.

[0121] As the operator further lowers the fixing plate 154, the two locking protrusions 155 bend due to their elasticity, and each tip 155a passes through the two locking holes 153a. When the tips 155a of the two locking protrusions 155 have fully passed through the two locking holes 153a, the locking protrusions 155 return to their original straight shape due to their elasticity, thereby engaging the tips 155a of the locking protrusions 155 with the locking holes 153a.

[0122] By employing this one-click snap-fit ​​connection structure, the fixing plate 154 can be fixed to the support arm 153, allowing the sensor device 5 to be easily installed on the key base plate in a short time. It is worth noting that the arrangement of the locking protrusion 155 and the locking hole 153a can be reversed; that is, the locking protrusion 155 can be located on the support arm 153, and the locking hole can be located on the fixing plate 154.

[0123] By mounting the sensor device 5 in this manner on the lower part of the base plate 2, for example, when a beverage is spilled on the bed 1, when the user becomes incontinent, or when the bed is wiped with water, even if water splashes onto the sensor device 5 from the upper part of the base plate 2, the water hardly penetrates into the interior of the sensor device 5. This is because the lever cover 52 covers the upper part and surrounding area of ​​the support member 51 from the outside.

[0124] The critical base plate may have a structure of a different type from the grid described above, in whole or in part. For example, it may be a flat plate structure made of synthetic resin or metal. Flat plate critical base plates will be described below.

[0125] Figure 13 This is a schematic diagram of a first variant of the key base plate. Each key base plate in this embodiment, such as the back base plate, waist base plate, knee base plate, and foot base plate, has, for example, a flat plate structure made of metal.

[0126] Figure 13 (A) is a schematic representation of the key base plate (the example in the figure is the waist base plate 123, and similar examples are shown below). Figure 13 B is a schematic diagram of the key base plate on which the sensor device 5 is installed. The following description refers to the accompanying drawings. Each key base plate has multiple through holes 123a and 123b, which extend from the upper surface to the lower surface of the key base plate in the thickness direction. The multiple through holes 123a and 123b can be used as ventilation holes to improve ventilation of the bottom surface of the mattress placed on the base plate 2.

[0127] Multiple first through holes 123a are formed along a first direction of the key base plate. When the sensor device 5 is mounted on the key base plate, the protrusion 56 of the lever cover 52 can be accommodated within the first through holes 123a.

[0128] The second through hole 123b can be used to insert a fastener for mounting the sensor device 5 to the key base plate.

[0129] For example, the sensor device 5 is located below the key base plate. The multiple protrusions 56 of the lever cover 52 protrude upward from the multiple first through holes 123a, and the internal threaded holes of the four support arms 53 protrude upward from the four second through holes 123b. The through holes 54a of the two fixing plates 54 are respectively located above the second through holes 123b. Thus, each fixing plate 54 and each support arm 53 are fixed to the key base plate by various fixing screws (not shown in the figure), so that the sensor device 5 is firmly fixed to the key base plate in a suspended manner.

[0130] The structure described above and the shape of the key base plate shown in the figure are merely examples. For instance, the first through hole 123a and the second through hole 123b formed in the key base plate can be formed by machining the metal flat plate type key base plate according to the shape of the sensor device 5, or the sensor device 5 can be formed according to the shape of a pre-set hole. It is worth noting that although only an example of the waist base plate 123 is shown and described here, the same applies to other key base plates.

[0131] Figure 14 This is a schematic diagram of a second variation of the key base plate. Each key base plate in this embodiment, such as the back base plate, waist base plate, knee base plate, and foot base plate, has, for example, a flat plate structure made of resin.

[0132] Figure 14 (A) schematically shows the key base plate (the example in the figure is the waist base plate 323, and similar examples are shown below). Figure 14 (B) is a schematic diagram of a key base plate on which sensor device 5 is installed. Each key base plate includes multiple through holes 323a and 323b. The multiple through holes 323a and 323b serve as through holes in the key base plate extending from the upper surface to the lower surface in the thickness direction. For example, the multiple through holes 323a and 323b may be ventilation holes pre-formed in each key base plate to improve ventilation of the mattress placed on the base plate.

[0133] In this embodiment, the structure of each key base plate is the same as in the first variant, but the difference is that it is made of resin. In this embodiment, compared with key base plates made of metal, key base plates made of resin are easier to form through holes, etc., and can reduce noise from contact with other components.

[0134] Figure 15 This is a schematic diagram of the third variation of the key base plate. Compared to the first variation ( Figure 13 Similar to the first variant, each key base plate in this embodiment, including the back plate, waist plate, knee plate, and foot plate, has a flat metal plate structure. The key base plates in this example (the waist plate 223 in the figure, and similarly below) are the same as in the first variant in terms of the structure for mounting the sensor device 5 (specifically, the structure of the first through hole 223a and the second through hole 223b), but differ from the first variant in that the position of the sensor device 5 can be changed.

[0135] Figure 15 (A) is a schematic diagram of the key base plate. Figure 15 (B), 15(C), and 15(D) are schematic diagrams of the key base plate on which the sensor device 5 is mounted. The following description will refer to the accompanying drawings.

[0136] In the key base plate of this example, the number of first through holes 223a and second through holes 223b is increased in the first direction compared to the second variant. Therefore, the position of the sensor device 5 can be changed in the width direction of the bed 1, for example, as... Figure 15 As shown in (B) and (D).

[0137] Furthermore, the key base plate is provided with multiple sets of first through holes 223a and second through holes 223b corresponding to the sensor device 5 along the second direction. Therefore, the position of the sensor device 5 can be changed in the length direction of the bed 1, for example, as... Figure 15 As shown in (C) and (D).

[0138] Figure 16 This is a schematic diagram of the fourth variation of the key base plate. Compared to the third variation ( Figure 15 Similar to the second variant, each key base plate in this embodiment, including the back plate, waist plate, knee plate, and foot plate, has a flat plate structure made of resin. The key base plate in this example (the example in the figure is the waist plate 423, hereinafter the same) is the same as the second variant in terms of the structure for mounting the sensor device 5 (specifically, the structure of the first through hole 423a and the second through hole 423b), but differs from the second variant in that the position of the sensor device 5 can be changed.

[0139] Figure 16 (A) is a schematic diagram of the key base plate. Figure 16 (B), (C), and (D) are schematic diagrams of the key base plate on which the sensor device 5 is mounted. The following description will refer to the accompanying drawings.

[0140] In the key base plate of this example, the number of first through holes 423a and second through holes 423b is increased in the first direction compared to the second variant. Therefore, the position of the sensor device 5 can be changed in the width direction of the bed 1, for example, as... Figure 16 As shown in (B) and (D).

[0141] Furthermore, the key base plate is provided with multiple sets of first through holes 423a and second through holes 423b corresponding to the sensor device 5 along the second direction. Therefore, the position of the sensor device 5 can be changed in the length direction of the bed 1, for example, as... Figure 16 As shown in (C) and (D).

[0142] The above embodiments are merely illustrative examples and are not intended to limit the scope of the invention to these embodiments. The invention can be implemented in various forms different from the above embodiments.

Claims

1. A user detection system for detecting the status of a user on a bed, the user detection system comprising: Multiple sensor devices are configured to sense the user's load and emit signals based on the load; as well as The monitoring and control device is configured to detect the user's state by receiving signals from multiple sensor devices; The user detection system is configured to be detachably installed on the bed in a manner that allows for later addition; as well as The multiple sensor devices are detachably mounted in a suspended manner at multiple different locations on the floor plan of the bed.

2. The user detection system according to claim 1, wherein, The base plate has multiple through holes that extend along the thickness direction of the base plate and can be used as ventilation holes. Each of the sensor devices includes a pressure-receiving part that can be pressed by a user's load; With each sensor device mounted on the base plate, the pressure-bearing part is inserted into the through hole from below; as well as Each sensor device is configured to sense the user's load by pressing a pressure point in a mattress press-through hole placed on the base plate.

3. The user detection system according to claim 2, wherein, With each sensor device installed on the base plate, the upper surface of the pressure-bearing part is at the same height as or lower than the upper surface of the base plate, causing the lower surface of the mattress to enter the through hole due to the user's load, thereby pressing the upper surface of the pressure-bearing part of the mattress.

4. The user detection system according to claim 2 or 3, wherein, The number of through holes in the base plate is greater than the number of sensor devices. By changing the through hole into which the pressure part of each sensor device is inserted, the installation position of each sensor device on the base plate can be changed.

5. The user detection system according to claim 2 or 3, wherein, The base plate has a mesh structure, and the multiple grids of the mesh structure serve as the multiple through holes.

6. The user detection system according to claim 2 or 3, wherein, The base plate is a flat plate made of metal or resin, and the flat plate has a plurality of vent holes, which serve as the plurality of through holes.

7. The user detection system according to claim 1, further comprising: The mounting bracket is used to detachably mount the sensor device to the base plate. The mounting bracket is configured so that the operator can secure the sensor device to the base plate using screws or by one-click fixing.

8. The user detection system according to claim 7, wherein, The fastener has a snap-fit ​​connection structure, which allows the operator to fix the sensor device to the base plate with one click.

9. The user detection system according to claim 7 or 8, wherein, The upper surface of the fastener is at the same height as or lower than the upper surface of the base plate.

10. The user detection system according to claim 1, comprising: Eight sensor devices; When the user lies supine on the bed with their body straight and aligned with their height along the length of the bed, the baseboard is divided into four areas, which respectively bear the load from the user's upper back, the waist (from the lower back to the hips), the upper part of the lower limbs (from the thighs to the knees), and / or the lower part of the lower limbs (from the calves to the feet). In each of the four regions of the base plate, any two of the eight sensor devices are installed; and Two sensor devices are installed in each area of ​​the base plate, respectively located in the first half-area from the center of the width direction of each area of ​​the base plate to one end of the width direction, and in the second half-area from the center of the width direction of each area to the other end of the width direction.

11. The user detection system according to claim 1, wherein, The base plate includes four key base plates: a back base plate that supports the user's upper back, a waist base plate that supports the area from the user's lower back to the hips, a knee base plate that supports the upper part of the lower limbs from the user's thighs to the knees, and a foot base plate that supports the lower part of the lower limbs from the user's calves to the feet. The angles of the back base plate, the knee base plate, and the foot base plate relative to the horizontal plane are variable. The user detection system includes eight sensor devices, with any two of the eight sensor devices installed in each of the four key base plates. as well as Two sensor devices are installed on each critical base plate, respectively located in a first half-region extending from the center of the width direction of each critical base plate to one end of the width direction, and in a second half-region extending from the center of the width direction of each critical base plate to the other end of the width direction.

12. The user detection system according to claim 2, wherein, Each sensor device includes a support and a lever cover disposed on the upper side of the support; The lever cover includes a fulcrum supported by the support member and an extension extending from the fulcrum in one direction in a plan view. The extension can rotate vertically about the fulcrum and be elastically lifted from the support; The lever cover has the pressure-receiving portion on the upper part of the extension; and Each sensor device is mounted such that the extension extends in one direction along the width of the base plate, and in the plan view, the pressure-bearing part is located closer to the center of the base plate in the width direction than the fulcrum.

13. The user detection system according to claim 12, wherein, Each sensor device includes: A cushioning pad is provided below the extension of the lever cover; and The pressure sensor is positioned above the support and below the cushioning pad; When the pressure-bearing part is pressed down by the user's load, the lever cover falls, applying pressure to the pressure sensor through the buffer pad, and the pressure sensor outputs a signal corresponding to the pressure.

14. The user detection system according to claim 12 or 13, wherein, The base plate has two or more through holes, which are located at different positions in the width direction of the base plate; The sensor device includes two or more pressure-receiving parts disposed on the upper part of the extension, and the pressure-receiving parts are disposed at different positions along a direction extending from the extension in a plan view; as well as With the sensor device mounted on the base plate, two or more pressure-bearing parts are respectively inserted into two or more through holes provided in the width direction of the base plate.

15. The user detection system according to claim 12 or 13, wherein, Each sensor unit's lever cover extends from above, covering the entire area on the upper side of the support.

16. The user detection system according to claim 11, wherein, The monitoring and control device is located on the lower side of the waist base plate.

17. The user detection system according to claim 11, wherein, The bed includes a base plate drive system for driving the one or more key base plates; The monitoring and control device is connected to the base plate drive system and detects the user status based on signals from multiple sensor devices and signals from the base plate drive system regarding the drive of the critical base plate.

18. The user detection system according to claim 1, wherein, Each of the plurality of sensor devices includes a pressure-receiving part pressed by the user's load and a pressure sensor for detecting the user's load via the pressure-receiving part; The pressure-bearing part is inserted into a through hole that penetrates the bottom plate in the thickness direction; Each sensor device is configured to detect the user's load by pressing the pressure point.

19. The user detection system according to claim 18, wherein, The bed includes a mattress placed on the base plate, and the pressure portion is pressed when the mattress expands into the through-holes under the user's load.

20. A sensor device is included in the user detection system according to claim 1.

21. A bed comprising the user detection system according to claim 1.

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