WO2016108266A1

WO2016108266A1 - Bed senor and bed embedded with same

Info

Publication number: WO2016108266A1
Application number: PCT/JP2015/083032
Authority: WO
Inventors: 佳宜石橋; 宏暢前澤
Original assignee: パラマウントベッド株式会社
Priority date: 2014-12-28
Filing date: 2015-11-25
Publication date: 2016-07-07

Abstract

A bed sensor, in a bed having a supporting member and a supported member that is supported by the supporting member, detects a load applied to the supporting member from the supported member. This bed sensor has a pin inserted through both a first hole provided in the supported member and a second hole provided in the supporting member, the pin coupling the supported member to the supporting member. Further, a strain gauge is attached to a small diameter portion in the central portion of the pin. The deformation of the pin is detected by the strain gauge and the load applied to the pin is detected. Accordingly, when detecting a load applied to a required portion of a bed, the load can be detected by means of a simple configuration. Further, the present invention is capable of providing: a bed sensor which can be easily mounted in the bed, and have high versatility; and a bed embedded with the bed sensor.

Description

Bed sensor and bed incorporating the same

The present invention relates to a patient bed or a bed for a healthy person in a hospital or a care facility such as a care bed, an electric bed, or a care lift (hereinafter collectively referred to as a bed). In addition, regarding the bed sensor for obtaining a biological signal and the bed incorporating the sensor, in particular, it is possible to easily measure the load at a required part of the bed, and install it later on the bed in use in addition to the production of the bed. The present invention also relates to a bed sensor and a bed incorporating the same.

In a bed and an electric bed used in hospitals, nursing homes, homes, etc., a load sensor for detecting the load is installed for various controls. For example, for elderly people with dementia and patients just after surgery, equipped with a bed prediction / detection system that enables bed prediction based on the determination of bed leaving and bed movement and the movement of the user on the bed. In the couch device, it is essential to acquire the load information of the couch (Patent Document 1 and Patent Document 2). For example, in the bed leaving prediction / detection system of Patent Document 1, load sensors are installed on the legs of the four corners of the frame that supports the bed portion, and proportional distribution is performed from the four load measurement values. Calculate the center of gravity. And the patient's bed on the bed can be determined from the average value or the total weight of the bed load. From the movement of the center of gravity, the patient on the bed is in the end sitting position at the end of the bed, and is just getting out of bed. It is possible to determine whether or not it is going to be done.

Also, in the electric bed, the bed frame (inner floor) is moved up and down by the actuator supported at the base end of the bed cart, and the back bottom and the like supported by the bed frame are swung upward and downward. In this case, in order to detect a load applied to the actuator, it is necessary to install a load sensor on the actuator.

As described above, in the bed, it is necessary to detect the load applied to the bed leg or the driving device (actuator). Conventionally, the load sensor is incorporated in the bed leg or the actuator incorporates the load sensor. Thus, the load at the required position is detected. For example, in Patent Document 3, the actuating cylinder (7) of the actuator is supported by the support cylinder (8), but the support cylinder (8) and the actuating cylinder (7) A detection cylinder (9) is provided in between, and a strain gauge (10) is attached to the detection cylinder (9) so that the load acting on the operating cylinder (7) is detected by the strain gauge (10). (Refer to FIG. 2 of Patent Document 3 for the reference).

JP 2007-190269 A Japanese Patent No. 4087832 JP 2009-121666 A Special table 2013/108503 gazette Japanese Patent No. 4423603 Japanese Patent No. 4829020 Japanese Patent No. 5108776 Japanese Patent No. 5435598 JP2008-206868

However, since the conventional load sensor is incorporated in the components of the bed or the actuator of the driving device, it is necessary to incorporate the load sensor at the same time when the bed is manufactured and adjust the detection output thereof. Even when a load sensor is incorporated into the actuator, it is necessary to incorporate the load sensor into the actuator at the same time as manufacturing the actuator and adjust its detection output.

Therefore, the mounting of the load sensor on the bed is large and difficult, and the installation of the load sensor is complicated. In addition, when the load sensor fails, since the load sensor is incorporated in the bed constituent member, it is not easy to replace it, and the maintenance cost increases. Furthermore, when it is found that the performance of the load sensor is insufficient during the use of the bed, adjustment of the load sensor is complicated, and adjustment of the sensor output and the like is difficult. In addition, when the specifications of the bed are determined, the constituent members and driving devices such as actuators are also determined to be specific, so that the load sensor is also dedicated to the bed and has low versatility.

In addition, Patent Document 4 discloses a bed load detector that detects a load applied to the bed by a load cell, and Patent Document 5 includes a strain sensor installed in a component of the bed, and the strain fluctuations thereof. A biological data detection device that detects a respiratory rate and a heart rate from a quantity is disclosed, and Patent Literature 6 discloses a bed load detector in which load detectors are installed on legs of four corners of the bed. , Patent Document 7 discloses that a sensor unit is provided at the upper end of a bed support, detects vertical force, and monitors heart rate, respiratory rate, and weight. Patent Document 8 discloses It is disclosed that a load sensor is built in a couch actuator. Further, Patent Document 9 discloses a bed apparatus that installs load sensors on the legs of the four corners of the bed and calculates a bed center of gravity indicating the position of the patient on the bed from the detection signals.

However, the known techniques disclosed in these Patent Documents 4 to 9 are not capable of detecting a load with a simple configuration, and are incorporated in a bed by a dedicated mounting method, and have a problem that the versatility is low. I had it.

The present invention has been made in view of such a problem, and when detecting a load acting on a required portion of the bed, the load can be detected with a simple configuration and easily mounted on the bed. An object of the present invention is to provide a bed sensor with high versatility and a bed incorporating the same.

The bed sensor according to the present invention comprises:
In a bed sensor for detecting a load applied to the support member from the supported member in a bed having a support member and a supported member supported by the support member,
A connecting member that is inserted in common into the first hole provided in the supported member and the second hole provided in the supporting member, and connects the supported member and the supporting member;
A strain gauge provided on the connecting member;
It is characterized by having.

In this bed sensor,
The connecting member has, for example, a pin shape such as an elongated rod shape, and has a concave portion with a concave outer surface in the middle portion in the longitudinal direction, and the strain gauge is attached to the concave portion. It is preferable to do.

Further, the bed sensor of the present invention has, for example, a lead wire that is electrically derived from the strain gauge and connects the signal of the strain gauge to the outside.

Further, the connecting member has a stopper larger than the first hole and the second hole at one end in the longitudinal direction, and the connecting member is connected to the first hole and the second hole from the other end in the longitudinal direction. The first hole of the connecting member is inserted into the second hole in common, and a snap pin is engaged with the first hole and the other end protruding from the second hole. The connecting member can be prevented from coming out of the second hole.

Furthermore, the connecting member may have a hollow structure, and the lead wire of the strain gauge may be configured to be led out through the inside of the hollow connecting member.

The connecting member is, for example, a fastening part that fastens the constituent members of the bed.

The bed according to the present invention is
A supporting member; a supported member supported by the supporting member; one or a plurality of sensors for detecting a load applied to the supporting member from the supported member; and a bed based on a detection value of the sensor A bed with a bed sensor having a center of gravity position, a bed user's bed and bed, a bed user's weight, or a control device that detects the user status of the bed including biological information of the bed user; The sensor is any one of the above-described bed sensors.

For example,
The controller is
Based on the input signal from the sensor and an input signal from the sensor, the bed center of gravity position, the bed user's bed and bed, the weight of the bed user, or the biological information of the bed user It has a unit which has a calculating part which calculates a user situation, and an output part which outputs the calculation result of this calculating part in one case. The control device is further configured to include an external calculation unit that inputs a signal indicating a user status of the bed from the output unit of the unit and calculates diagnosis or care information of the bed user. be able to.

According to the present invention, when connecting the supported member to the supporting member and assembling the constituent members of the bed, a strain gauge is attached to a connecting member such as a pin that connects the supporting member and the supported member, When a load is applied to the supported member, the strain gauge affixed to the connecting member is deformed. Therefore, the load can be detected by detecting an electric signal due to the deformation of the strain gauge. it can. In this case, since the constituent members of the bed are connected by the connecting member, the load applied from the supported member to the supporting member can be easily changed by changing the connecting member to the connecting member of the present invention. Can be detected. And unlike the conventional load sensor built in the frame leg or actuator, which is a component, even if a problem occurs in the sensor, in the present invention, the supported member and the support member A bed sensor having desired characteristics can be easily installed simply by replacing a connecting member such as a pin that connects the two. Moreover, the output adjustment after incorporating the connecting member type sensor of the present invention into the bed is also easy. Furthermore, since the present invention is a connecting member type sensor for connecting constituent members, it can be used for detecting loads of various constituent members.

It is a figure which shows the sensor for bed which concerns on embodiment of this invention. It is a figure which shows the bed with which the sensor for bed of embodiment of this invention was mounted | worn. It is a perspective view which shows the connection aspect of a to-be-supported member and a supporting member. Using the bed sensor according to the embodiment of the present invention to detect the position of the bed center of gravity, the bed user's bed and bed, the weight of the bed user, or the bed user status including the bed user's biological information It is a block diagram which shows this embodiment. It is a figure which shows the modification of the sensor for beds of embodiment of this invention. It is a figure which shows the example which actualized the bed sensor of embodiment of this invention as a stepped volt | bolt. It is a figure which shows the example which actualized the sensor for bed of embodiment of this invention as an interlocking hook.

Hereinafter, embodiments of the present invention will be specifically described with reference to the accompanying drawings. FIG. 1 is a view showing a pin 10 of a bed sensor according to an embodiment of the present invention, FIG. 2A is a plan view showing an example of a bed to which the bed sensor of the embodiment of the present invention is applied, FIG. (B) is a front view of the frame portion. As shown in FIG. 2A, the frame 30 has a rectangular frame shape, and a plurality of horizontal bars 31 extending in the bed width direction and a plurality of vertical bars extending in the bed vertical direction are included in the frame 30. 32 is installed. Then, the

base end portions

41b and 42b of the

actuators

41 and 42 are supported on the specific horizontal rail 31 so as to be slightly swingable. For example, a support portion 33 is erected on the horizontal rail 31, and a base end portion 42 b of the actuator 42 is swingably supported by the support portion 33. The same applies to the base end portion 41b of the actuator 41. The

pistons

41a, 42a of the

actuators

41, 42 are connected to

links

34, 35 whose

tip portions

41c, 42c are to be moved (acted) by the

actuators

41, 42, respectively.

As described above, the

actuators

41 and 42 which are constituent members of the bed support the

links

34 and 35 which are constituent members of the other bed. This will be generally described with reference to FIG. That is, in the actuator 42, the tip 42c of the piston 42a is connected to the link 35 of the supported member 36 of the bed, so that the actuator 42 as the supporting member connects the supported member 36 via the link 35. And support. When the piston 42a of the actuator 42 advances and retracts, the piston 42a moves the link 35 forward or pulls it back backward. Thereby, the supported member 36 performs an operation necessary for the bed by the actuator 42. For example, when the supported member 36 is a back bottom of a bed, the back bottom swings up and down by the operation of the actuator 42, and the back bottom moves upright or horizontally.

At this time, as shown in FIG. 3, the link 35 fixed to the supported member 36 is provided at two positions separated in the bed width direction so that the pair of connecting pieces 37a and 37b hang down in parallel to each other. It has been. The connecting pieces 37a and 37b are formed with holes at positions facing the bed width direction, and the tip 42c of the piston 42a is also provided with a hole penetrating the tip 42c. . The pin 10 is inserted through these holes in common, and the piston 42a and the connecting pieces 37a and 37b are connected to each other so as to be rotatable.

Conventionally, the pin for connecting the piston 42a and the connecting pieces 37a and 37b to each other is the pin 1 as shown in FIG. The pin 1 basically has a cylindrical shape, and a stopper 1a having a larger diameter than the main body 1b is provided at one end thereof. Then, from the tip 1c side of the pin 1, it is inserted into each hole provided in the connecting pieces 37a, 37b and the tip 42c of the piston 42a, and for example, a snap pin is engaged with the portion exposed from the hole in the tip 1c of the pin 1. By stopping, the pin 1 is prevented from coming out of the hole. Thus, conventionally, the piston 42 a of the actuator 42 and the supported member 36 are connected by the pin 1, whereby the supported member 36 is supported by the actuator 42. Also in this embodiment, members that do not need to detect a load are connected by this pin 1.

On the other hand, in this embodiment, the pin 10 shown in FIG. 1B is used in place of the conventional pin 1 in order to detect the load acting on the actuator 42 from the supported member 36. This pin 10 has the same outer diameter and thickness of the stopper 11 as the stopper 1a. The length of the pin 10 is the same as that of the pin 1, and the outer shape thereof is the same as that of the pin 1. However, the pin 10 has a proximal end portion 12 and a distal end portion 14 on the stopper 11 side, and the outer shape thereof is the same as that of the pin 1, but the intermediate portion 13 between the proximal end portion 12 and the distal end portion 14 has a proximal end. The diameter is smaller than that of the portion 12 and the tip portion 14. A strain gauge 20 is attached to the peripheral surface of the intermediate portion 13. The proximal end portion 12, the intermediate portion 13, and the distal end portion 14 of the pin 10 have a hollow shape, and the conductive wire 16 connected to the strain gauge 20 passes through the thick portion of the intermediate portion 13, and the inside of the pin 10. To be introduced. The stopper 11 has an annular shape, and its opening is closed by a lid 15 shown in FIG. The conducting wire 16 introduced into the pin 10 is led out to the outside through a hole 15 a provided in the lid 15. When a load is applied to the pin 10, the strain gauge 20 is deformed along with the deformation of the pin 10, and the degree of the deformation is led to the outside through the conductor 16 as an electrical signal. The stopper 11 is not limited to an annular shape, and the shape for deriving the conducting wire 16 is arbitrary, for example, the opening is elliptical and the lid 15 is also elliptical.

Next, the operation of the bed sensor of the present embodiment configured as described above will be described. First, after the couch parts are delivered to the user, the couch is assembled at the couch installation location of the user. At this time, the pin 10 is used instead of the conventional pin 1 when the actuator 42 and the link 35 of the supported member 36 are connected. Then, as shown in FIG. 3A, the pin 10 is inserted from the tip portion 14 of the pin 10 through the hole of the connecting piece 37a, the hole of the tip portion 42c of the piston 42a, and the hole of the connecting piece 37b. The tip end portion 14 protrudes outward from 37b. Of course, the insertion direction of the pin 10 is not limited to the above case, but may be the order of the hole of the connecting piece 37b, the hole of the tip 42c of the piston 42a, and the hole of the connecting piece 37a. Then, the snap pin 21 is inserted into the hole 14 a provided in the tip portion 14 of the pin 10, and the snap pin 21 is locked to the tip portion 14. This prevents the pin 10 from coming out of the connecting pieces 37a, 37b and the piston 42a, and the actuator 42 and the supported member 36 are connected. Then, when the piston 42a of the actuator 42 advances and retracts, the actuator moves the supported member 36. For example, when the supported member 36 is a back bottom, the back bottom is raised and lowered. Of course, the assembly of the bed using the pins 10 can also be applied at the time of manufacturing the bed in the factory.

At this time, a load is applied from the supported member 36 to the piston 42a. Due to this load, a load is applied to the pin 10 connecting the supported member 36 and the piston 42a, and the pin 10 is distorted. The detection signal by the gauge 20 changes, and the load applied to the pin 10 can be detected by an external load calculation unit connected to the strain gauge 20 via the conducting wire 16.

In the present embodiment, since the outer diameter of the intermediate portion 13 of the body of the pin 10 is smaller than the outer diameters of the base end portion 12 and the distal end portion 14, the intermediate portion 13 is connected to the holes of the connecting pieces 37 a and 37 b and the piston 42 a. It does not contact the hole of the tip end portion 42c. For this reason, the strain gauge 20 affixed to this intermediate part 13 does not contact these holes, and the strain gauge 20 is prevented from being damaged. However, if the portion of the pin that contacts the first hole of the supported member and the second hole of the supporting member is surely only the base end portion 12 and the tip end portion 14, the portion of the intermediate portion 13 is not necessarily required. It is not necessary to make the outer diameter smaller than the base end portion 12 and the tip end portion 14. In the present embodiment, the detection signal of the strain gauge 20 is derived via a conductor, but the detection signal of the strain gauge 20 is obtained by installing a wireless transmission circuit on the peripheral surface of the intermediate portion 13. It can also be derived outside by radio. In addition, by forming the pin 10 in a hollow structure and inserting the conducting wire 16 into the hollow interior, the conducting wire 16 is reliably prevented from interfering with the hole of the connecting portion.

As described above, in the present invention, the load applied to the bed constituent member can be easily detected simply by changing the connecting pin at the location where the load is to be detected to the pin 10. Since this pin 10 can detect the load which acts on a support member from the said supported member only by installing instead of the pin which connects a support member and a supported member, the bed sensor of this invention has versatility. high. When the detection signal needs to be adjusted, the detection characteristics of the bed sensor including the pin 10 and the strain gauge 20 can be easily adjusted by simply removing the snap pin 21 and removing the pin 10. It is easy to maintain.

In this embodiment, the strain gauge is affixed to the small diameter portion of the intermediate portion of the pin 10, but the present invention is not limited to this. For example, the strain gauge is affixed to the stopper 11 of the pin 10. Also good. In the illustrated example of FIG. 1B, one strain gauge 20 is used. However, the present invention is not limited to this, and the detection accuracy can be improved by attaching a plurality of strain gauges. Further, in the present embodiment, a pin is used as a connecting member to which a strain gauge is attached. However, the present invention is not limited to this, and a strain gauge is attached to a bolt or the like of a bed fastening component to form a connecting member. It is also possible.

Note that the present invention is not limited to detecting a load applied to the actuator from the bed constituent member, but also when detecting a load acting on the pedestal of the bed for detecting the position of the center of gravity. A load can be detected by using the pin 10 of the present invention at a portion connected by a pin. That is, the present invention is not limited to the case of detecting the load applied to the actuator, but can be applied if a fastening member is used at the arbitrary position in order to detect the load at an arbitrary position applied to the bed. Is possible.

Next, another embodiment of the present invention will be described. FIG. 4 is a block diagram showing a bed control unit 51 in which the bed sensor of the present invention described above is incorporated. As described above, the bed sensor of the present invention is incorporated in a bed fastening component or the like, and is connected to the control unit 51 installed in the vicinity of the bed. As shown in FIG. 4, the detection signals of the

sensors

54a, 54b, 54c, and 54d according to the embodiment of the present invention are input to the control unit 51 via the input /

output units

503a, 503b, 503c, and 503d. Also, an instruction signal from the bed hand switch 53b is input to the control unit 51 via the input / output unit 502b. Furthermore, power is supplied to the control unit 51 from the AC adapter 52 or the bed controller 53a via the terminal 501 or the terminal 502a, respectively. The DC power input to the control unit 51 is converted into voltage and current used in the control unit 51 by a DC / DC converter 504. And the control part 51 performs transmission / reception of the signal with respect to the bed controller 53a, or the control part 51 receives the signal from a bed controller. This received signal is input to the calculation unit 506, and a predetermined calculation is performed.

The above-described circuits of the control unit 51 are installed, for example, in a resin casing, and the temperature / humidity sensor 507 is further installed in the control unit 51. Further, a no-voltage contact output unit 508 is installed in the control unit 51, and a signal is output from the no-voltage contact output unit to an external device in a non-contact manner. In the control unit 51, a short distance such as WIFI (WirelessWireFidelity) 509a, sensor network ZigBee509b (registered trademark), Bluetooth (registered trademark) BLE (Bluetooth (registered trademark) Low Energy) 509c and the like. An input / output device of wireless communication technology is installed, and a result calculated by the calculation unit 506 is output to an external device using these short-range wireless communication technologies. Further, the control unit 51 is provided with a USB terminal 510 for signal input / output. An external personal computer 511 is connected to the control unit 51 via the USB terminal 510, and the calculation result of the calculation unit 506 is obtained. Is output to the computer 511 and a signal from the computer 511 is input to the control unit 51.

Based on the detection signals of the sensors 54a to 54d, the calculation unit 506 detects information indicating whether the user is on the bed or is leaving the bed, and the center of gravity position of the bed to detect the user's position on the bed. Information on the position, information on the body movement of the user on the bed, information on the weight or weight change of the user on the bed, or biological signals such as the user's respiratory rate or heart rate on the bed The user status of the bed such as information on the bed is calculated.

For example, the calculation unit 506 detects the user status of each bed as described below.
(1) Center-of-gravity position First, the sensor shown in FIG. 1 is incorporated into the bed fastening components at four positions in plan view in the rectangular bed of the bed, and the load is detected. The detected load values obtained from the four sensors are designated as W1, w2, w3, and w4, respectively. Further, when assuming an xy orthogonal coordinate system in which one corner of the rectangular bed is the origin and two sides of the rectangular bed are the x-axis and the y-axis, respectively, the load detection values W1, The coordinates in the xy coordinate system at the positions where w2, w3, and w4 are obtained are (x1, y1), (x2, y2), (x3, y3), and (x4, y4), respectively. At this time, when the gravity center position is (x0, y0), the gravity center position is expressed by the following mathematical formula 1.

In this way, the two-dimensional center of gravity position (x0, y0) of the bed is obtained. This barycentric position can be regarded as the position of the user on the bed, and the position of the bed user on the bed can be detected by calculating the barycentric position (x0, y0). And from the position on the bed user's bed, not only the information whether the bed user is getting out of bed or being in bed, but the bed user is at the end position of the bed and is about to get out of bed. Information on whether or not there is a risk of falling from the couch, information on whether the user has moved and movements on the couch, and information on the weight change of the user on the couch Can also be detected. Further, by detecting the movement locus of the center of gravity position, this rising can be detected even when the user changes from the lying body to the rising state on the bed.

(2) Biological Signal Next, the calculation unit 506 detects biological information such as the respiration rate and heart rate of the bed user from the load detection signals detected by the sensors 54a to 54d. That is, the calculation unit 506 performs a fast Fourier transform on the load detection signal and performs frequency analysis. For example, when a living body such as a patient lies on a mattress placed on the bottom of the bed frame, the load detection signal of the sensor provided in the fastening part for fastening the constituent members of the bed includes a minute vibration. Appears. When the load signal accompanied with the minute vibration is subjected to fast Fourier transform (FFT), biological information data such as a respiratory rate and a heart rate (pulse rate) of the living body can be obtained as a minute distance variation.

Even if the calculation unit 506 detects from the detection result of the center of gravity position that the user is present on the bed, the calculation unit 506 is configured so that the biological signal detection unit 6 performs respiration, heartbeat, and the like. When the biological information is not detected, it can be seen that there is no user on the bottom of the bed and the bed sensor detects the load of the load. In this way, by combining the load data and the biological information data, it is possible to determine the state of the bed user (whether they are in bed) with high accuracy.

The control unit 51 is also provided with a temperature / humidity sensor 507, and signals relating to the user status of the various types of beds calculated by the calculation unit 506, together with the temperature signal and humidity signal of the temperature / humidity sensor 507, are connected to the USB terminal. The data is output to a computer (PC) 511 connected to 510. Further, the signal regarding the user status of the bed and the temperature / humidity signal can be output to an appropriate external device via the no-voltage contact output 508. Further, the signal regarding the user status of the bed and the temperature / humidity signal are transmitted to an external hospital server or the like by short-range wireless communication via the WIFI 509a, Zigbee (registered trademark) 509b or BLE 509c, and sent to the hospital server. Thus, the position information and biological information of the patient on the bed are displayed on a monitor connected to the server. In addition to hospital servers, external equipment includes computers installed in nursing homes or home-care homes, and the patient's location information and biological information are stored in the cloud for various positions. It can also be used by health care workers.

In another embodiment of the present invention, the control unit 51 uses the bed sensor of the present invention, and the calculation unit 506 calculates the center of gravity position and the movement of the center of gravity position. It is possible to detect whether the user is in the end sitting position of the mattress of the bed, whether he is getting out of bed, being in bed, getting up, lying down, or the like. In addition, the calculation unit 506 only detects the amount of change in the weight of the user on the couch at the end, and if the couch user is getting out of bed, the weight becomes 0 or a value close thereto, It is possible to detect getting out of bed without calculating the position of the center of gravity. Therefore, since it is not necessary to detect the position of the center of gravity, it is not necessary to install a plurality of sensors according to the present invention, and if only one sensor is installed, it is sufficient to detect bed leaving and bed presence. In addition, the patient's weight value itself can be grasped over time. Furthermore, the amount of activity of the patient can be monitored by the calculation unit 506 detecting the movement locus of the center of gravity position or detecting the number of body movements within the predetermined time (the number of movements of the center of gravity position).

For monitoring the movement locus of the center of gravity, at least two sensors may be incorporated in two bed fastening parts. For example, in the case of determination of getting up, it can be detected by calculating the detection signals of these two sensors. In addition, when detecting a planar patient position on the bed, at least three sensors are required. If the patient detects that the patient is in the end position of the bed by detecting the position of the center of gravity, an alarm is given to an external alarm device to notify that the patient is about to leave the bed mattress. Output a signal. In addition, a device that lowers and raises the side fence of the bed electrically (automatically) is installed, and when the calculation unit 506 detects that the patient has moved to the end of the bed, the side fence is lowered electrically. It is also possible to configure to output a command signal to an external side fence control device. Thereby, when a patient transfers to a wheelchair etc. from a bed, it can be supported. Conversely, when the calculation unit 506 detects that the patient has not moved for a certain period of time, the calculation unit 506 outputs an alarm signal of pressure ulcer risk to an external alarm device, or outputs it to an external bed control device. By moving the bottom or mattress of the bed, a signal for prompting the patient to change their position can be output. The movement trajectory of the patient obtained from the detection of the position of the center of gravity can be output and stored in an external computer, and can be used for treatment of a patient or examination of care by a doctor or a nurse.

Also, the calculation unit 506 calculates the respiration rate, and the control unit 51 can output it to the outside and continuously monitor it. For this reason, while being able to watch over a patient's condition, a change of a patient's condition can be detected. In addition, when the patient's breathing is disturbed, the back bottom of the bed can be raised by using an external computer connected to the control unit 51, and the mattress and the like can be raised. It is possible to prevent accidental ingestion and the like. In addition, the raising / lowering of the back bottom of the bed can be made to output a control signal of the back bottom by the calculation unit 506 in the control unit 51 without being controlled by an external computer. Further, the calculation unit 506 can calculate the heart rate, store it as continuous data, and can be used for monitoring the patient's condition.

Since the hand switch 53b is connected to the control unit 51, the patient or caregiver uses the hand switch 53b to drive the raising and lowering of the bottom such as the back bottom of the bed or the knee bottom, or The history information when the raising / lowering of the bed frame is driven can be output and stored in an external computer via the control unit 51. Thereby, when it is necessary to know the bed information, this can be used later. Usually, during the maintenance of the couch, the inspection is performed by raising and lowering the bottom and raising and lowering the couch frame. At this time, the operator performs the above operation at a higher speed than when using a normal couch. Let In this embodiment, when a biological signal is not detected and the weight value of the user on the bed is extremely small, it can be detected that there is no bed user such as a patient on the bed. In this case, when command signals for raising and lowering the bottom and raising and lowering the bed frame are input to the control device that controls the bed, the bed control device performs these operations for maintenance. It is possible to operate at high speed. Accordingly, it is not necessary to set the operation speed during maintenance, and the maintenance work can be made more efficient. The temperature / humidity sensor 507 is installed in the control unit 51 and the temperature and humidity around the bed are measured when the sensors 54a to 54d are strain sensors, and the calculation unit 506 outputs the strain sensor. This is to compensate for the temperature. In addition, based on the temperature and humidity detected by the temperature / humidity sensor 507, a control device that controls an external hospital room controls the air conditioner in the hospital room to maintain an appropriate temperature and humidity. it can. This is particularly beneficial when the patient is a home-care elderly person who cannot adjust the room temperature and humidity himself.

As described above, the bed sensor according to the present invention, i.e., a sensor that can be installed on the existing bed structure, is used to detect the position of the patient on the bed by detecting the position of the center of gravity. By detecting the floor or getting out of bed, the patient's condition is grasped, and a biological signal is detected, and biological information such as respiratory rate and heart rate is constantly monitored. In this way, the state of the patient on the bed can be constantly monitored simply by incorporating a highly versatile sensor into the bed. The state of watching can be constantly grasped by a hospital server or the like, and when an abnormality occurs, an alarm can be issued to be noticed, which is beneficial for hospital workers such as doctors and nurses. It is also possible to send this monitoring information to the patient's family who lives in a remote location, in which case it is as if the family is aware of the patient's condition around the patient on the hospital couch. Such a state can be created. Thereby, the loneliness of the patient who receives medical care and care and the sense of security of the patient family can be satisfied. In this case, in addition to medical information related to the patient's situation, a camera or an information device with a camera is installed in the vicinity of the patient. It may be sent to the patient's family. When this sensor is incorporated into a bed set up in a nursing facility or a patient's home where there are no medical workers, the caregiver can always detect the patient's condition without constantly watching the patient. The medical staff in the hospital can always grasp the patient's condition in the hospital by transmitting a biological signal or the like to the hospital server or the like.

Note that the present invention is not limited to the above embodiment, and various modifications can be made. For example, FIG. 5 shows a modification of the pin 1. FIG. 5C is a cross-sectional view taken along the line CC of FIG. 5B. As shown in FIG. 5C, the intermediate portion 13a of the pin 1 may be a square bar having a rectangular cross section instead of the cylindrical intermediate portion 13 shown in FIG. As a result, the directivity in the detection direction of the strain gauge 20 is deteriorated, but the electrical output for the strain is increased. Further, the mounting site of the bed sensor of the present invention is not limited to that shown in FIGS. 2 and 3, and for example, as shown in FIG. 5, a strain gauge 20 is attached to a stepped bolt 61 used in the bed. It can also be pasted. In addition, as shown in FIG. 7, the strain gauge 20 may be attached to a pin 68 that connects the interlocking trunk 66 and the bed frame 67 such as a carriage, which are necessary for realizing the raising and lowering operation of the bed. In any case, the sensor provided with the strain gauge of the present invention can be replaced with an arbitrary part as long as a load is applied to a member constituting the bed.

Also, for example, the obtained respiratory rate, heart rate, weight, etc. can be displayed on the operation panel of the bed operation remote control such as a hand switch.

The present invention can easily measure the load at a required part of a bed in a patient bed or a bed for a healthy person in a hospital or a nursing facility such as a care bed, an electric bed, or a care lift. A signal can be easily obtained. In addition to the production of the couch, the sensor can be installed after the couch in use.

DESCRIPTION OF SYMBOLS 1,10: Pin 1a, 11: Stopper 12: Base end part 13: Intermediate | middle part 14: Tip part 20: Strain gauge 30: Frame 34, 35: Link 36: Supported member 37a, 37b: Connection piece 41, 42:

Actuators

41a, 42a:

Pistons

41c, 42c:

Tip portions

41b, 42b: Base end portions 51: Control portions 53a: Beds 53b: Hand switches 54a to 54d: Sensors (bed bed sensors of the present invention)
501, 502, 503a to 503d: input / output unit 506: arithmetic unit (CPU)

Claims

In a bed sensor for detecting a load applied to the support member from the supported member in a bed having a support member and a supported member supported by the support member,
A connecting member that is inserted in common into the first hole provided in the supported member and the second hole provided in the supporting member, and connects the supported member and the supporting member;
A strain gauge provided on the connecting member;
A bed sensor characterized by comprising:
2. The connection member according to claim 1, wherein the connecting member has a pin shape, and has a concave portion with a concave outer surface at an intermediate portion in a longitudinal direction, and the strain gauge is attached to the concave portion. The bed sensor described.
The bed sensor according to claim 1, further comprising a lead wire that is electrically derived from the strain gauge and connects a signal of the strain gauge to the outside.
The connecting member has a stopper larger than the first hole and the second hole at one end in the longitudinal direction, and the connecting member is connected to the first hole and the first from the other end in the longitudinal direction. The first hole and the second hole of the connecting member by engaging a snap pin with the other end projecting from the first hole and the second hole. The bed sensor according to any one of claims 1 to 3, wherein the connecting member does not come out of the two holes.
The bed sensor according to claim 3, wherein the connecting member has a hollow structure, and the lead wire of the strain gauge is led out through the inside of the hollow connecting member.
The bed sensor according to any one of claims 1 to 5, wherein the connecting member is a fastening part that fastens the constituent members of the bed.
A supporting member; a supported member supported by the supporting member; one or a plurality of sensors for detecting a load applied to the supporting member from the supported member; and a bed based on a detection value of the sensor A bed with a bed sensor having a center of gravity position, a bed user's bed and bed, a bed user's weight, or a control device that detects the user status of the bed including biological information of the bed user; The bed is a bed sensor according to any one of claims 1 to 6.
The controller is
Based on the input signal from the sensor and an input signal from the sensor, the bed center of gravity position, the bed user's bed and bed, the weight of the bed user, or the biological information of the bed user The bed according to claim 7, further comprising: a unit including a calculation unit that calculates a user situation and an output unit that outputs a calculation result of the calculation unit in one housing.
The said control apparatus has an external calculating unit which inputs the signal which shows the user condition of the said bed from the said output part of the said unit, and calculates the diagnosis or care information of the said bed user. Item 9. The bed according to item 8.