JP2008206867A - Rolling-over promotion apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an inexpensive rolling-over promotion apparatus highly accurately monitoring the movement of a user by determining information acquired by combining weight information and gravity center movement information of a bed user and applying no burden on the bed user. <P>SOLUTION: When a weight threshold determination part determines that the weight of a user on a bed is a weight threshold or more, and a first gravity center movement threshold determination part determines that the movement of the gravity center position in the bed longitudinal direction does not exceed a first gravity center movement threshold, a second gravity center movement threshold determination part determines that the movement of the gravity center position in the bed width direction does not exceed a second gravity center movement threshold, a weight gravity center position monitoring part monitors a time during the state is continued and, when the monitoring time continues for a prescribed time, detects that the bed user does not roll over and the body position change is required. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention detects the presence or absence of turning over on the bed for patients who have been laid down, etc., and notifies the caregiver when the turning over is insufficient, prompts the change of position, and continues the same posture on the bed The present invention relates to a roll-over promoting device that is effective in preventing the occurrence of pressure sores and the like.

  Recently, patients who are bedridden, such as elderly people with dementia, are left under pressure when part of their body is kept under pressure. appear. In order to prevent this pressure ulcer from occurring, it is necessary for the caregiver to always accompany the patient on the bed. For this reason, there is a problem that the burden is large for the caregiver.

  Therefore, a roll-over management system has been proposed that periodically detects changes in the position of bedridden elderly people or patients lying on a hospital bed, etc., manages the state of roll-over, and prevents the occurrence of pressure ulcers. (Patent Document 1). In this rolling management system, measurement sensors are attached to the left and right shoulders and waists of a patient, a reception antenna that transmits and receives information to and from the measurement sensor is installed below the bed frame, and an ultrasonic microphone is connected to the measurement sensor. The ultrasonic communication transmitted from the terminal is output and information related to the ultrasonic wave is output, and the measurement communication device includes the ultrasonic information transmitted from the ultrasonic microphone and the identification information including the identification number transmitted from the receiving antenna. Based on this, a change in body position accompanying a time change of the measurement sensor is detected. And the said measurement sensor transmits the ultrasonic wave resulting from the transmission of the identification number given to the chip microcomputer which transmits the identification number given to self-confidence when receiving the radio wave transmitted from the receiving antenna and generating power It has an ultrasonic piezoelectric element.

JP 2006-325683 (Claim 1 and paragraphs 0032 to 0036)

  However, in the above-described prior art, it is necessary to attach a measurement sensor to the patient himself / herself, and it is necessary to install an ultrasonic microphone and a receiving antenna around the bed. There is a difficulty that the burden of is large.

  The present invention has been made in view of such a problem, and by determining information combining the weight information of the bed user and the center of gravity movement information, the movement of the user can be accurately monitored, and the user can An object of the present invention is to provide a roll-over promoting device that can detect with high accuracy that the player has not turned over, has a low apparatus cost, and does not impose a burden on the bed user.

  The rolling acceleration device according to the present invention includes a load measuring unit that detects a load on the bed portion and generates a load signal, and a weight calculation unit that calculates the weight of a user located on the bed portion based on the load signal. A weight threshold value determining means for determining whether or not the weight is equal to or greater than a predetermined threshold value, a gravity center position calculating means for calculating the gravity center position of the user based on the load signal, and a calculation result of the gravity center position Center-of-gravity movement amount calculation means for calculating the center-of-gravity movement amount of the center-of-gravity position, and a first center of gravity that determines whether or not the movement amount in the longitudinal direction of the bed portion of the center-of-gravity position exceeds a first center-of-gravity movement amount threshold A movement amount threshold determination means; a second gravity center movement amount threshold determination means for determining whether or not the movement amount in the width direction of the bed portion of the center of gravity position exceeds a second gravity center movement amount threshold; and the weight Threshold determination means and first and second weights Based on the determination result of the movement amount threshold determination means, the weight is equal to or greater than a predetermined threshold, and the position of the center of gravity does not exceed the first threshold of movement of the center of gravity, but exceeds the second threshold of movement of the center of gravity. Body weight center-of-gravity movement monitoring means for monitoring the time in which it is determined that there is no change, and when the time monitored by the weight-center-of-gravity movement monitoring means continues to exceed a predetermined time, it is necessary to change the body position It is characterized by determining sex.

  Another apparatus for promoting rolling over according to the present invention includes a load measuring unit that detects a load on the bed and generates a load signal, and a weight calculation that calculates the weight of a user located on the bed based on the load signal. Means, weight range determining means for determining whether or not the weight is within a predetermined range, center-of-gravity position calculating means for calculating the center-of-gravity position of the user based on the load signal, and calculation of the center-of-gravity position A center-of-gravity movement amount calculating means for calculating a center-of-gravity movement amount of the center-of-gravity position from the result, and a first for determining whether or not the movement amount in the longitudinal direction of the bed portion of the center-of-gravity position exceeds a first center-of-gravity movement amount threshold. Centroid movement amount threshold value determining means, and a second centroid movement amount threshold value determining means for determining whether or not the movement amount in the width direction of the bed portion of the centroid position exceeds a second centroid movement amount threshold value; The weight range determining means and the first and second weights Based on the determination result of the movement amount threshold determination means, the weight is within a predetermined range, and the center of gravity position does not exceed the first center of gravity movement amount threshold but exceeds the second center of gravity movement amount threshold. Body weight center-of-gravity movement monitoring means for monitoring the time in which it is determined that there is no change, and when the time monitored by the weight-center-of-gravity movement monitoring means continues to exceed a predetermined time, it is necessary to change the body position It is characterized by determining sex.

  In this case, it is preferable to have a warning means for notifying the caregiver when the necessity of the change in body position is determined.

  According to the present invention, it is possible to detect the presence or absence of a bed user such as a patient on the bed with high accuracy by determining the combination of the weight information of the user and the gravity center position information. In addition, since the movement of the user is divided into the longitudinal direction and the width direction of the bed and the amount of the movement is grasped, the turning operation in the bed width direction and the rising operation in the bed longitudinal direction can be detected separately. it can. Furthermore, the device of the present invention only needs to be installed around the bed by load measuring means such as a load cell, and the bed user such as a patient does not need to be equipped with any measurement sensor or the like. The bed user is not burdened and the apparatus cost is low.

  Hereinafter, a roll over promoting device according to an embodiment of the present invention will be specifically described with reference to the accompanying drawings. FIG. 1 is a schematic view of the bed apparatus according to the first embodiment of the present invention. FIG. 2 is a schematic view showing an example in which four load sensors 3-1 to 3-4 are arranged at four ends of the bed part 1. FIG. Shows a block diagram when the signal of each load sensor 3 is processed by the controller 5 and each function is operated. As shown in FIG. 1, load sensors 3 (3-1, 3-2) that generate load signals by detecting loads on the bed portion 1 at four corners of a legged frame 2 that supports the bed portion 1. 3-3, 3-4) are provided one by one. The load signal generated by the load sensor 3 is output at regular intervals by a bed leaving prediction / detection system controller 5 (hereinafter referred to as controller 5) provided on one of the wall portions 4 provided on the two short sides of the bed portion 1. Is read.

The controller 5 includes a weight calculating unit, a center of gravity position calculating unit, a center of gravity moving amount calculating unit, a weight threshold value determining unit, a first center of gravity moving amount threshold value determining unit, a second center of gravity moving amount threshold value determining unit, and a weight center of gravity moving amount monitor. A unit, a storage unit, an alarm device, an alarm selection unit, and the like are provided, and processing of each unit is performed by software. The controller 5 reads the load signal generated by the load sensor 3 at regular intervals. The weight calculation unit calculates the weight of the user on the bed 1 based on the read signal. Since the bed part 1 is provided with accessories such as mattresses, comforters and fences (not shown), the weight calculation unit uses this state as a reference (= 0 kg, correction of the origin of the center of gravity), and the user There calculates the weight W _T user by calculating reads a load signal of the bed section 1 when lying on the bed section 1 by the controller 5, a load increase from the reference.

The center-of-gravity position calculation unit calculates the center-of-gravity position of the user on the bed 1 based on the load signal generated by the load sensor 3 that the controller 5 reads at regular intervals. As shown in FIG. 2, the side connecting the first load sensor 3-1 and the third load sensor 3-3 is the head side, the second load sensor 3-2 and the fourth load sensor 3-4 are The side that connects is the foot side. The distance between the first load sensor 3-1 and the second load sensor 3-2 with the head side left end of the bed 1 (the lower left end of the bed 1 in FIG. 2) as the origin (0, 0). Is B _X , and the distance between the first load sensor 3-1 and the third load sensor 3-3 is _BY . When the user sleeps on the bed 1, W _{1 to} W ₄ are calculated values of the load increase from the reference of the load signals generated by the first to fourth load sensors 3-1 to 3-4. Assuming that (W ₁ + W ₂ + W ₃ + W ₄ = W _T ), the gravity center position (X, Y) of the user can be expressed by the following Equation 1. According to this equation, the center-of-gravity position calculation unit calculates the center-of-gravity position of the user on the bed 1.

The center-of-gravity movement amount calculation unit obtains the movement amount of the center-of-gravity position as follows. Each time the calculation unit 21 of the controller 5 reads the load signal at regular time intervals, the center-of-gravity position movement amount calculation unit calculates the current center-of-gravity position calculation result and the center-of-gravity movement amount time difference T ₂ set by the center-of-gravity movement amount time difference setting unit. The movement amount of the center of gravity position is calculated from the calculation result of the past center of gravity position that is traced back. As for the movement when the user gets up, the movement from the supine position to the long sitting position or the supine position to the long sitting position through the lateral position can be considered. Since it is moving, the amount of movement of the center of gravity in the X-axis direction only is taken into account when detecting the rising.

The center of gravity position of the user at a certain time _{t 2 (X 2, Y 2} ), the center of gravity of the past going back from a certain time _{t 2} by the center of gravity movement distance time difference _{T 2 t 2-T2 (X} 2-T2, Y 2 _−T2 ), the movement amount | ΔX | of the center of gravity position in the X-axis direction can be expressed by the following formula 2. According to this equation, the center-of-gravity movement amount calculation unit calculates the movement amount of the user's center-of-gravity position on the bed 1.

On the other hand, when the bed user turns over, the position of the center of gravity moves in the width direction (short direction) of the bed. Therefore, the center-of-gravity movement amount calculation unit calculates the movement amount | ΔY | = | Y ₂ −Y _{2 −T 2} | of the center-of-gravity position in the Y direction.

Weight threshold determination unit monitors the body weight W _T of the user on the bed section 1 is computed by the body weight computing unit, determines whether the body weight W _T of the user is above a predetermined weight threshold W _T1 To do. Or determines whether the body weight W _T is within a predetermined range. If the weight measurement value is equal to or greater than the weight threshold value WT1, it is determined that the bed user is located on the bed. Further, if the weight measurement value of the bed user is within a predetermined range, that is, if an upper limit value is provided in addition to the lower limit value, and it is determined that the weight value is equal to or lower than the upper limit value, luggage is placed on the bed. As a result, it is determined that the center of gravity movement has not occurred, and the center of gravity movement due to the disturbance can be excluded from the target of turning over. As described above, the weight threshold value determination unit determines that the user is located on the bed based on whether the weight measurement value is equal to or greater than the weight threshold value or within the weight range.

  The first center-of-gravity movement amount threshold determination unit determines whether or not the movement amount ΔX in the bed longitudinal direction (X direction) exceeds the first center-of-gravity movement amount threshold. When the first centroid movement amount threshold value determination unit determines that ΔX exceeds the first centroid movement amount threshold value, the rising is detected. On the other hand, the second centroid movement amount threshold determination unit determines whether or not the movement amount ΔY in the bed width direction (Y direction) exceeds the second centroid movement amount threshold. When the second center-of-gravity movement amount threshold determination unit determines that ΔY has exceeded the second center-of-gravity movement amount threshold, the turning over is detected.

The weight threshold value setting unit sets a weight threshold value _WT1 or a weight range when determining whether or not the user on the bed portion 1 is located on the bed. The weight threshold value _WT1 and the weight range are input from a personal computer connected to the controller 5, calculated by the calculation unit of the controller 5, and stored in the storage unit. The first center-of-gravity movement amount setting unit and the second center-of-gravity movement amount setting unit set the first center-of-gravity movement amount threshold value and the second center-of-gravity movement amount threshold value, and are input from a personal computer connected to the controller 5. 5 is calculated and stored in the storage unit.

  The alarm device generates an alarm according to the determination results of the weight threshold value determination unit and the gravity center position region determination unit, and the alarm selection unit has a function of selecting the presence and type of the alarm.

FIG. 3 shows a block diagram when the signals of the first load sensor 3-1 to the fourth load sensor 3-4 in FIG. 1 are processed by the controller 5 to operate each function. The load signals generated by the first to fourth load sensors 3-1 to 3-4 are read and calculated by the calculation unit 21 of the controller 5 at regular intervals. Weight calculating unit calculating section 21 for calculating a weight W _T of the user on the bed section 1, the center of gravity movement amount calculating section for calculating a center of gravity movement amount of a user on the bed section 1, the weight of the user is predetermined A body weight threshold value determination unit that determines whether or not the body weight threshold value WT1 is equal to or greater than the first body weight threshold value W _T1. An amount threshold determining unit; a second center of gravity moving amount threshold determining unit for determining whether or not the amount of movement of the center of gravity position in the bed width direction exceeds the second center of gravity moving amount threshold; the weight threshold determining unit; And the weight is equal to or greater than a predetermined threshold based on the determination result of the second centroid movement amount threshold determination means, and the centroid position does not exceed the first centroid movement amount threshold. Weight to monitor the time when it is determined that the quantity threshold is not exceeded Heart movement amount monitoring unit, weight threshold value setting unit for setting weight threshold value, first and second center-of-gravity movement amount threshold value setting unit for setting first and second movement amount threshold values, storage unit, alarm device, alarm selection unit And a storage unit 22 for storing a body weight threshold value and a center-of-gravity movement amount threshold value used for determination, and an alarm signal transmission unit 31 for generating an alarm according to the determination result of each determination unit. Further, the controller 5 further includes a setting operation unit 24 such as an operation switch and a power switch, an alarm display / stop operation unit 26 such as an alarm display unit 25 and a nurse call 29.

  Each alarm device transmits an alarm signal from the controller 5 and notifies the nurse station 30 via the nurse call 29 or, when managing a plurality of beds, a LAN (Local Area Network) access point 27 from the communication connector 12. Can be relayed to the PC 30 at a remote location.

Next, the operation of the roll over promoting device according to the embodiment of the present invention configured as described above will be described. Since the bed part 1 is provided with accessories such as mattresses, comforters and fences (not shown), the weight calculation unit uses this state as a reference (= 0 kg, correction of the origin of the center of gravity), and the user There calculates the weight W _T of the user by calculating reads a load signal of the bed section 1 when lying on the bed section 1 by the controller 5, a load increase from the reference. The weight of the user is stored in the storage unit 22 of the controller 5 by pressing an operation switch (not shown) of the controller 5 or operating a personal computer immediately after the user has slept on the bed 1. it can be, as a reference body weight W _S of the user the weight of the user at this time. Further, by inputting from a personal computer connected to the weight of the user obtained by the scales or the like to the controller 5, it is also possible to store the reference weight W _S of the user in the storage unit of the controller 5.

  FIG. 4 is a flowchart showing the operation of the roll over promoting device in the present embodiment. First, the weight threshold value determination unit determines that the weight measurement value is equal to or greater than the predetermined weight threshold value (step S1), and the first center-of-gravity movement amount threshold determination unit determines the bed of the movement amount of the center of gravity position (bed portion). It is determined that the longitudinal direction component does not exceed the first center-of-gravity movement amount threshold (step S2), and the second center-of-gravity movement amount threshold determination unit determines that the component of the center-of-gravity position movement amount in the width direction of the bed is When it is determined that the second center-of-gravity movement amount threshold has not been exceeded (step S3), the weight center-of-gravity movement amount monitoring unit monitors the time during which the determination state continues (step S4). Then, when the time monitored by the body weight center-of-gravity movement monitoring unit exceeds a predetermined monitoring time, it is determined that the bed user has never turned over during the monitoring time (step S5). A warning is issued as a request for a position change (step S6). Note that this alarm is not limited to sound, but alarm information may be displayed on the screen of a terminal placed at a remote location such as a nurse station. It is done. On the other hand, when the component in the bed longitudinal direction of the moving amount of the center of gravity position exceeds the first center of gravity moving amount threshold before the predetermined monitoring time elapses, this is the movement in the bed longitudinal direction. The body weight center of gravity movement amount monitoring unit detects that the person is getting up, and updates the monitoring time to 0, and again determines the weight threshold value determination unit, the first center of gravity movement amount threshold value determination unit, and the second center of gravity movement amount determination unit. Start monitoring results. In addition, if the component in the bed width (short) direction of the movement amount of the center of gravity position exceeds the second center of gravity movement amount threshold before the predetermined monitoring time has elapsed, Since it is a movement, it is detected that it has been turned over, and the weight center of gravity movement amount support unit updates the monitoring time to 0, and again, the weight threshold value determination unit, the first center of gravity movement amount threshold value determination unit, and the second center of gravity movement amount Monitoring of the determination result of the determination unit is started.

  In this way, if the center-of-gravity movement amount component in the bed width direction exceeds the second center-of-gravity movement amount threshold within a predetermined monitoring time, it is determined that the bed is turned over, and the center-of-gravity movement amount component in the bed longitudinal direction However, if it exceeds the first center-of-gravity movement amount threshold, this is determined to be a rise, and in both cases, the local pressure situation of the bed user's body has been eliminated, and the risk of pressure ulcers has been eliminated. No alarm is output. On the other hand, if the movement of the center of gravity position such that it is determined to turn over or get up does not occur even after the predetermined monitoring time has been exceeded, the weight center of gravity movement monitoring unit outputs an alarm signal, The caregiver is encouraged to change positions by means such as warnings displayed on the terminal. This prevents stagnation of blood circulation due to local pressure on the body and prevents the occurrence of pressure ulcers. Moreover, caregivers such as nurses do not always have to be accompanied by the bed user (patient), and the caregiver's labor is reduced. Furthermore, the patient does not need to wear any equipment for this rollover monitoring, so there is no burden on the patient. Furthermore, only the load detector such as a load cell is installed around the bed, and the calculation and determination can be performed at a place separated from the bed by a computer or the like, so that the apparatus does not become large. . Moreover, the device cost is low.

  Next, a second embodiment of the present invention will be described with reference to FIG. In the present embodiment, a weight range determination unit is provided instead of the weight threshold determination unit. The weight range determination unit determines that the weight measurement value is within a predetermined upper limit value and lower limit value range. When the weight measurement value is out of the predetermined weight range, the position of the center of gravity cannot be measured accurately, such as when a caregiver's luggage is placed on the bed. Therefore, in this case, even if the movement amount of the center of gravity position of the bed user exceeds the gravity center movement amount threshold value, the turning operation is not determined.

  As described above, in the present invention, each threshold value, predetermined range, and the like are input from a personal computer connected to the controller 5 and are calculated by the calculation unit 21 of the controller 5. However, this calculation operation may be performed by a personal computer. This calculation result can be input to the controller 5 from a personal computer.

It is the schematic of the bed apparatus which concerns on 1st Embodiment of this invention. 4 is a schematic view showing an example in which four load sensors 3-1 to 3-4 are arranged at four ends of the bed part 1. FIG. The block diagram when the signal of each load sensor 3 is information-processed by the controller 5 and each function is operated is shown. It is a figure which shows the operation | movement flow of the rolling promotion apparatus which concerns on 1st Embodiment of this invention. It is a figure which shows the operation | movement flow of the rolling promotion apparatus which concerns on 2nd Embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1; Bedding part 2; Frame 3; Load sensor 3-1; 1st load sensor 3-2; 2nd load sensor 3-3; 3rd load sensor 3-4; 4th load sensor 4; Unit 5; bed leaving prediction / detection system controller 6; edge sitting position detection region 20; control unit 21; arithmetic unit 22; storage unit 23; operation display unit 24; setting operation unit 25; alarm display unit 26; ; LAN AP
28; PC 29; Nurse call 30; Nurse station 31; Alarm signal transmitter

Claims (3)

A load measuring means for detecting a load on the bed and generating a load signal; a weight calculating means for calculating the weight of a user located on the bed based on the load signal; and the weight exceeds a predetermined threshold value A weight threshold value determining means for determining whether or not there is present, a center-of-gravity position calculating means for calculating the center-of-gravity position of the user based on the load signal, and a center-of-gravity movement amount of the center-of-gravity position from the calculation result of the center-of-gravity position Center-of-gravity movement amount calculation means, first center-of-gravity movement amount threshold value determination means for determining whether or not the movement amount of the bed portion in the longitudinal direction of the center-of-gravity position exceeds a first center-of-gravity movement amount threshold value; Second center-of-gravity movement amount threshold determination means for determining whether or not the amount of movement of the bed in the width direction exceeds the second center-of-gravity movement amount threshold; the weight threshold value determination means; and the first and second weight threshold value determination means The determination result of the center-of-gravity movement amount threshold determination means Monitoring the time during which it is determined that the weight is equal to or greater than a predetermined threshold, and the position of the center of gravity does not exceed the first center of gravity movement amount threshold and does not exceed the second center of gravity movement amount threshold. A weight-over-center-of-gravity movement monitoring unit that detects the need for a change in body position when the time monitored by the weight-over-center of gravity movement monitoring unit continues to exceed a predetermined time. Promotion device. A load measuring means for detecting a load on the bed and generating a load signal; a weight calculating means for calculating a weight of a user located on the bed based on the load signal; and the weight within a predetermined range A weight range determining means for determining whether or not there is present, a centroid position calculating means for calculating the centroid position of the user based on the load signal, and calculating a centroid movement amount of the centroid position from the calculation result of the centroid position. Center-of-gravity movement amount calculation means, first center-of-gravity movement amount threshold value determination means for determining whether or not the movement amount of the bed portion in the longitudinal direction of the center-of-gravity position exceeds a first center-of-gravity movement amount threshold value; Second center-of-gravity movement amount threshold determination means for determining whether or not the amount of movement of the bed in the width direction exceeds the second center-of-gravity movement amount threshold; the weight range determination means; and the first and second weight range determination means Based on the determination result of the center-of-gravity movement amount threshold determination means Monitor the time during which it is determined that the weight is within a predetermined range and the gravity center position does not exceed the first gravity center movement amount threshold and does not exceed the second gravity center movement threshold. A body weight center-of-gravity movement monitoring unit, and when the time monitored by the body weight center-of-gravity movement amount monitoring unit continuously exceeds a predetermined time, the necessity for a change in body posture is determined. apparatus. The roll over promoting device according to claim 1 or 2, further comprising alarm means for notifying a caregiver when the necessity of the change in posture is determined.

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