JP2014140447A - Method for monitoring person in bed and device therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for monitoring a person in bed and a device therefor for detecting a state before falling from a bed beforehand, and preventing a fall accident.SOLUTION: A method for monitoring a person in bed includes: a measured distance data storage step for storing a distance with respect to a bed area; a coordinate transformation step for subjecting the measured distance data to three-dimensional coordinate transformation, and storing the data; a bed area registration step for registering a dangerous area, etc.; a distance reference data storage step for storing a distance when a care-receiver, etc. are absent; a human presence sensing step; a human body's center of gravity setting step with a mean coordinate of a total of all coordinates of X-axis coordinates where a human body detection distance is detected as a center of gravity in the X-axis direction, and with a mean coordinate of a total of all coordinates of Y-axis coordinates where the human body detection distance is detected as a center of gravity in the Y-axis direction; and a fall accident prevention step for transmitting a signal for preventing a fall accident when the coordinate of the human body center of gravity is in the dangerous area, etc., and to provide a device therefor.

Description

  The present invention monitors the positional relationship between a bed and a cared person, etc. in order to prevent a fall accident from the bed for a cared person or a patient with dementia who must be cared or nursing. The present invention relates to a bed occupant monitoring method and an apparatus therefor.

  With regard to a monitoring device for a sleeping person on a bed, for example, in Patent Document 1, a sensor that detects a variable having a correlation with a distance of a monitoring object in a monitoring target area, and a distance based on the variable output from the sensor. A computing device that computes a related value; and a judging device that judges a change in the shape of the monitoring object based on the computed distance-related value. The judging device has a distance-related value equal to or greater than a first threshold value. The monitoring device is configured to determine that the first change has occurred in the monitoring object when the value is equal to or less than the second threshold value, which is a value greater than the first threshold value. A monitoring device is disclosed that is configured to determine that there is a second change in the monitoring object when it is less than or equal to a third threshold that is larger and greater than the second threshold.

JP 2003-290154 A

  In the invention described in Patent Document 1, in paragraph [0008] of Patent Document 1, the determination device changes the shape of the monitoring object within the first predetermined time after the distance-related value exceeds the third threshold. When it cannot be detected, it is determined that the monitored object has gone out of the monitored area, so there is a description that the bedridden of the sleeping person can be determined, so instead of determining based on where the sleeping person is in the bed, Judgment is made based on the shape change within a predetermined time. Therefore, it is impossible to detect whether the sleeping person is likely to fall from the bed, so that the falling from the bed cannot be prevented in advance, and the sleeping person such as the care recipient falls from the bed and is injured. .

  Further, in paragraph [0123] of Patent Document 1, the monitoring device uses the pressure sensor in addition to the distance sensor, and uses the output from the pressure sensor to determine whether the user is in bed or out of bed. Since there is a description that the reliability is increased, it is suggested that the reliability of the determination that the vehicle has fallen from the bed is insufficient with only the distance sensor. From this, it is necessary to install a pressure sensor in addition to the distance sensor in order to detect that the caregiver or the sleeping person has fallen from the bed, so that the investment cost for installing the monitoring device described in Patent Document 1 is increased. There was a problem of becoming higher.

  SUMMARY OF THE INVENTION An object of the present invention is to provide a bed occupant monitoring method capable of preventing in advance a fall accident from a bed by detecting in advance that a sleeping person such as a cared person on the bed falls from the bet only by a distance sensor and It is to provide such a device.

  The bed occupant monitoring method 1 according to claim 1 sets the measurement range of the distance image sensor 2 capable of measuring the distance of a plurality of locations to be the bed 4 and the area around the bed in plan view. Measurement that stores the distance (Z-axis direction) between the distance image sensor 2 and the measurement point 11 as measurement distance data for each of the bet 4 and a plurality of measurement points 11 (X-axis direction and Y-axis direction) around the bet. Distance data storage step S1 and coordinate conversion for storing the measurement distance data at all measurement points 11 as the same three-dimensional coordinate data and storing it as coordinate conversion distance data when the upper surface of the bed 4 is set as a horizontal plane. In step S2 and in plan view, the vicinity of the bet peripheral edge 10 is defined as a dangerous area (i), and an area closer to the center of the upper surface of the bet 4 from the dangerous area (a) is defined as a caution area (b). The betting area registration step S3 in which the area is defined as the safety area C and the betting peripheral area outside the betting peripheral edge 10 is registered as the falling area D, and there is no person such as the care recipient 7 in the betting area 4 and the betting surrounding area. The distance reference data storage step S4 for storing the coordinate conversion distance data for all measurement points 11 in the state as distance reference data, and the difference between the coordinate conversion distance data and the distance reference data at all measurement points 11 occurs. It is determined that a person such as the cared person 7 exists in the bet 4 and the area around the bet. On the other hand, if the difference does not occur, the person such as the cared person 7 does not exist in the bed 4 and the area around the bet. It is higher than the upper surface a of the bed 4 when it is determined that a person is present in the person presence sensing step S5 to be judged and the person presence sensing step. The desired height is set as the human body detection height b, the human body detection distance data obtained by subtracting the human body detection height b from the coordinate conversion distance data at all the measurement points 11 is stored, and the human body detection distance data is detected. The average coordinate of the total of all the X-axis coordinates is the center of gravity in the X-axis direction, and the total average coordinate of all the coordinates of the Y-axis coordinates from which the human body detection distance data is detected is the center of gravity in the Y-axis direction. When the human body center of gravity position setting step S6 and the coordinates of the human body center of gravity position exist in the attention area b, a signal for alerting is transmitted to the information terminals 20 and 21 that can notify a caregiver or nurse, and the human body When the coordinates of the center of gravity position are in the danger area (a), a danger signal is transmitted to the information terminals 20 and 21 that can be notified to a caregiver or a nurse and / or an operation signal of the impact absorber 22 at the time of falling The And a fall accident prevention step S7 to be transmitted.

  The bed occupant monitoring method 1 according to claim 2 is the same as that according to claim 1, wherein the impact absorbing method of the impact absorber 22 at the time of falling is in a standing state beside the bed 4 simultaneously with receiving the operation signal. The method is characterized in that the shock absorbing mat 23 that has been stopped is released and the shock absorbing mat 23 is laid on the floor around the bed 4.

  The bed occupant monitoring device according to claim 3 sets the measurement range of the distance image sensor 2 capable of measuring the distance of a plurality of locations to be the bed 4 and the bet peripheral area in a plan view, Measurement in which the distance (Z-axis direction) between the distance image sensor 2 and the measurement point 11 is stored as measurement distance data for a plurality of measurement points 11 (X-axis direction and Y-axis direction) on the bed 4 and in the peripheral area of the bet. Distance data storage means, and coordinate conversion means for converting the measurement distance data at all measurement points 11 into the same three-dimensional coordinates and storing them as coordinate conversion distance data when the upper surface of the bed 4 is set as a horizontal plane. In plan view, the vicinity of the bet periphery 10 is defined as a dangerous area (i), the area near the center of the upper surface of the bed 4 from the dangerous area (a) is defined as a caution area b, and the area surrounded by the caution area b is a safety area. Bet area registration means for registering the area around the bet 4 that is outside the bet peripheral part 10 as a fall area d, and all of the bet 4 and the person around the bet 7 in the absence of a person such as a cared person 7 The distance reference data storage means for storing the coordinate conversion distance data for the measurement point 11 as distance reference data, and the cared person 7 when the difference between the coordinate conversion distance data and the distance reference data at all the measurement points 11 occurs. The person presence sensing means for judging that the person such as the care recipient 7 does not exist in the bet 4 and the bet peripheral area when the difference is not generated. When the person presence detection step determines that a person is present, an arbitrary height higher than the upper surface a of the bed 4 is set as the human body detection height b. The human body detection distance data obtained by subtracting the human body detection height b from the coordinate conversion distance data at all the measurement points 11 is stored, and the average coordinate of all the coordinates of the X axis coordinates from which the human body detection distance data is detected is obtained. The human body centroid position setting means having the centroid in the X-axis direction, the centroid in the Y-axis direction as the average coordinate of all the Y-axis coordinates from which the human body detection distance data is detected, and the coordinates of the human centroid position are When the caution area B is present, a warning signal is transmitted to the information terminals 20 and 21 capable of notifying caregivers and nurses, and when the coordinates of the human body center of gravity position are present in the danger area a. And a fall accident prevention means for sending a signal for raising a danger to the information terminals 20 and 21 capable of notifying caregivers and nurses and / or sending an operation signal of the shock absorber 22 for fall. It is characterized by that.

  According to a fourth aspect of the present invention, the bed occupant monitoring device according to the third aspect of the present invention is the impact that the impact absorbing device 22 at the time of falling receives the operation signal and is locked next to the bed 4 while standing. The apparatus is characterized in that the absorbing mat 23 is released and the shock absorbing mat 23 is laid on the floor around the bed 4.

  The bed occupant monitoring method 1 according to claim 1 or 2 enables the care recipient 7 or the patient to fall from or fall out of the bed 4 so as to know who the care recipient 7 or the patient is. It can be watched in privacy without being reflected, and can be monitored in the dark so that it can be monitored 24 hours a day, 24 hours a day, and there is a risk of falling from the care recipient 7 or the patient on the bed 4 When it occurs, the caregiver or nurse is automatically notified at all times, so that the burden on the caregiver or nurse can be reduced.

  Further, a threshold value is set for the position of the center of gravity of the cared person 7 or patient on the bed 4 with an arbitrary height higher than the bed upper surface a as a human body detection height b, and the cared person 7 is within a range higher than the threshold value. When a patient or patient is detected, it is determined that there is a high possibility that the patient is moving on the bed, and measurement points less than the threshold, which is the human body detection distance, are not targeted for grasping the center of gravity. The average value of the total of all 11 X-axis coordinates and the average value of the total of all Y-axis coordinates are measured as the position of the center of gravity in the X-axis direction and the position of the center of gravity in the Y-axis direction of the care recipient 7 and patient, respectively. There is an effect that the position of the center of gravity of the care receiver 7 or the patient on the bed 4 can be grasped from the distance.

  Further, since the position of the center of gravity of the cared person 7 or the patient is determined with respect to the bed 4, when the center of gravity of the cared person 7 or the patient is in the danger area a on the peripheral part of the bed 4. Judging by the danger of falling, the caregiver or nurse can be immediately notified so that a quick response can be made, and the impact at the time of falling can be absorbed before the cared person 7 or patient falls. it can. If the care receiver 7 or the patient's center of gravity is located in the attention area b slightly closer to the center of the bed 4 from the peripheral edge of the bed 4, it is assumed that there is a sign of a fall, and an immediate notification is given to the caregiver or nurse for quick response. Depending on the situation, the caregiver or the nurse can operate the impact absorbing device 22 at the time of falling with the remote controller and complete the countermeasure for absorbing the impact at the time of falling beforehand.

  Since it can be easily installed in the existing bed 4 and the number of devices configured is small, it is compact and inexpensive, so that it can be installed with little investment and regardless of the size of the room.

  The bed occupant monitoring device according to claim 3 or 4 has the same effect as that of claim 1 or 2.

It is a flowchart showing the step of the bed betting person monitoring method of this invention. It is the front schematic diagram showing the use condition of the occupant monitoring method of the present invention. It is the front schematic diagram which showed the use condition of the occupant monitoring method when there is a sleeping person on a bed. It is the plane schematic diagram which showed the use condition of the occupant monitoring method in case a sleeping person exists on a bed. It is an Internet connection outline figure showing composition of the present invention. It is explanatory drawing explaining the measurement distance by a distance image sensor. It is explanatory drawing explaining the image which carries out image conversion of the measurement distance by a distance image sensor. It is explanatory drawing which shows a measurement point. It is explanatory drawing which shows the measurement point more than a human body detection height. It is a right side surface schematic diagram which shows the state which latched the shock absorption mat. It is a right-side schematic diagram which shows the state by which the shock absorption mat was laid on the floor.

  As shown in FIGS. 1 and 8, the bed occupant monitoring method 1 or the apparatus according to the present invention has a measurement range of a distance image sensor 2 capable of measuring a distance of a plurality of locations, as shown in a plan view. The distance between the distance image sensor 2 and the measurement point 11 is set according to the bet 4 and a plurality of measurement points 11 (X-axis direction and Y-axis direction) of the bet peripheral area. A measurement distance data storage step S1 for storing (axis direction) as measurement distance data, and three-dimensional coordinate conversion so that the measurement distance data at all measurement points 11 becomes the same when the upper surface of the bed 4 is set as a horizontal plane. Then, the coordinate transformation step S2 for storing the coordinate transformation distance data, and in the plan view, the vicinity of the bet peripheral portion 10 is set as the dangerous area A, and the area near the center of the upper surface of the bet 4 is noted from the dangerous area A. A betting area registration step S3 in which the area surrounded by the attention area b is defined as a safety area c, and the area around the betting 4 outside the betting peripheral portion 10 is registered as a falling area d; Distance reference data storage step S4 for storing coordinate conversion distance data for all measurement points 11 in the state where there is no person such as a cared person 7 in the bed peripheral area, and the coordinates at all measurement points 11 When a difference between the converted distance data and the distance reference data occurs, it is determined that a person such as the cared person 7 exists in the bet 4 and the area around the bet. On the other hand, when the difference does not occur, the cared person 7 etc. It is determined that a person is present in the person presence sensing step S5 in which the person judges that the person does not exist in the bet 4 and the area around the bet, and the person presence sensing step. In addition, an arbitrary height b higher than the bed upper surface a is set as the human body detection height b, and human body detection distance data obtained by subtracting the human body detection height b from the coordinate conversion distance data at all measurement points 11 is stored. The average coordinate of all the coordinates of the X-axis coordinates from which the human body detection distance data is detected is defined as the center of gravity in the X-axis direction, and the sum of all the coordinates of the Y-axis coordinates from which the human body detection distance data is detected. The human body center of gravity position setting step S6 with the average coordinate as the center of gravity in the Y-axis direction, and the information terminals 20, 21 that can notify a caregiver or nurse when the coordinates of the human body center of gravity position exist in the attention area b. A warning signal is transmitted, and if the coordinates of the center of gravity of the human body are in the dangerous area a, a danger calling signal is transmitted to the information terminals 20 and 21 capable of notifying caregivers and nurses, and / or , The apparatus includes a step including a fall accident prevention step S7 for transmitting an operation signal of the shock absorber 22 at the time of the fall, and implements the step. Hereinafter, each step will be described.

  As shown in FIGS. 2 and 3, the measurement distance data storage step S 1 is performed by using the distance image sensor 2 installed above the bet 4 as a target range for the bet 4 and the area around the bet. This is a step of measuring the distance between the bet 4 and the measurement point 11 in the area around the bet and storing the distance in the control box 3 as measurement distance data.

  As shown in FIG. 4, the distance image sensor 2 has a measurement area in a peripheral area including the bed 4 and the floor surface 30 on the side where the bed user such as the care recipient 7 moves up and down from the bed 4 in a plan view. A plurality of time-off-flight distance measuring sensors 5 for measuring the distance from the time when the projected infrared ray or laser reciprocates to the measurement point 11 such as the bed 4 as the measurement range are provided. One distance measurement sensor 5 measures the distance to one measurement point 11, and as shown in FIG. 8, the distance to the number of measurement points 11 corresponding to the number of distance measurement sensors 5 over the entire measurement range. Measured. The measured distance data is transmitted to the information processing device 6 such as the control box 3. Since distance measurement can always be carried out regardless of darkness, it can be monitored for 24 hours.

  The peripheral area including the floor 30 on the side where the bed user moves up and down can be arbitrarily set by a coordinate instruction. For example, a coordinate having a measurement range of about 50 cm is set based on the relationship between the coordinate and the length. be able to. The plurality of distance measuring sensors 5 provided in the distance image sensor 2 can arbitrarily select the number, the measurement accuracy, and the number of measurements per time. For example, there are a total of 19,200 distance measurement sensors 5 of 160 horizontal x 120 vertical, and each distance measurement sensor 5 reflects infrared rays toward a measurement object such as a bed 4 and returns. A distance image sensor 2 that measures the time of the time and converts it into a distance, has a measurement accuracy of up to 1 cm, and always performs a measurement at 30 times / second can be provided.

  The information processing device 6 such as the control box 3 captures and stores the measurement points 11 of the distance measuring sensors 5 on the coordinates as shown in FIG. 8 in the bed 4 and the area around the bed 4 in a plan view. . Then, measurement distance data captured as the distance in the Z-axis direction is stored for each of the X-axis and Y-axis coordinates of the measurement point 11 of the distance measurement sensor 5. The measurement distance for each measurement point 11 can be displayed on an information terminal 20 such as a personal computer that can communicate over the Internet, or a portable information terminal 21 such as a smartphone, a mobile phone, or a wireless communication device. The distance measurement data can also be displayed as an image with color shading. Further, a recording function can be provided.

  Next, it is coordinate conversion step S2. As shown in FIG. 6, since the distance image sensor 2 is installed at one place above the bed 4, even if the height in the vertical direction is the same when the bed 4 is a measurement object, the distance image sensor 2 is a straight line with the distance image sensor 2. A measurement point c having a short distance (L1) and a measurement point d having a long linear distance (L2) are mixed. For this reason, even if the same change occurs at each measurement point 11 on the bet 4, not all of them are regarded as the same distance change at the measurement point 11, so the upper surface of the bet 4 surface is at the same height. In order to make the measurement distance data at all measurement points 11 the same (L3) when set as a certain horizontal plane, the coordinate conversion is performed by three-dimensional coordinate conversion in the control box 3 as shown in FIG. Store as distance data.

  Next, it is a betting area registration step S3. As shown in FIG. 8, the coordinate conversion distance data measured by the distance measurement sensor 5 and subjected to the three-dimensional coordinate conversion has the measurement points e and f when the measurement point e is on the bed 4 and the measurement point f is the floor 30. However, it is determined that the measurement point e having a greatly different distance is the bet peripheral portion 10, and the measurement point e is stored as the bet peripheral portion 10. When the bet peripheral area is measured from the bet peripheral portion 10 to, for example, 50 cm, the range up to the coordinate corresponding to 50 cm is captured and stored based on the relationship between the X-axis and Y-axis coordinates and the actual dimensions.

  Then, as shown in FIG. 4, in the plan view, the vicinity of the bet peripheral portion 10 is, for example, 10 to 30 cm as a dangerous area A, and an area of, for example, a width of 10 to 30 cm near the center of the bed 4 from the dangerous area A The area around the bet 4 that is lower than the bet 4 surface is the fall area d, and the area surrounded by the attention area b is stored in the information processing device 6 such as the control box 3 and registered as the safety area c. . The range of the danger area A and the attention area B can be arbitrarily changed and set according to the speed of movement of the cared person 7 or the patient. When the cared person 7 or the patient may fall from the bed 4, it is set in time so that the fall impact absorbing device 22 in the fall accident prevention step operates to absorb the fallen person's impact.

  Next, distance reference data storage step S4. In order to detect the movement of the cared person 7 or the patient on the bed 4, as shown in FIG. 2, the height a which is the upper surface of the bed 4 when the cared person 7 or the patient is not on the bed 4 is used as a reference. As height, coordinate conversion distance data for all measurement points 11 in the absence is stored as distance reference data. At this time, if a bedding such as a futon exists on the bed 4, distance measurement is performed in the presence of the bedding, and the measurement data is converted into three-dimensional coordinates and stored as distance reference data.

  Next, it is human presence detection step S5. When the coordinate conversion distance measured by the distance measuring sensor 5 that measures the bet 4 and the peripheral area of the bet as the measurement target area is shorter than the distance of the distance reference data, the care recipient 7 or the like is included in the measurement area. Judge that there is a person. At this time, in order to avoid misjudgment such as noise, the minimum number of distance measurement sensors 5 that are determined to be present is arbitrarily set to a number of several or more. On the other hand, if the coordinate conversion distances measured by all the distance measurement sensors 5 are all the same as the distance of the distance reference data, it is determined that a person such as the care recipient 7 is not present in the measurement area.

  Next, it is human body gravity center position setting step S6. The center of gravity of the human body is in the range of the human body in a plan view in a sleeping state or standing state, and the weight per unit area is heavier than the four bed surfaces. The weight per unit area is considered to be almost directly proportional to the vertical height of the human body. Therefore, the threshold value is set so that a heavy portion of the human body is set as the selection range, and an arbitrary height b higher than the bet 4 surface, for example, the height b shown in FIG. Let b. This threshold value can be arbitrarily set so that the center of gravity can be easily obtained depending on the physique of the cared person 7 or the patient.

  Then, coordinate conversion human body detection distance data obtained by subtracting the human body detection height b set as the threshold value from the coordinate conversion distance data at all measurement points 11 is stored, and the X-axis coordinates from which the coordinate conversion human body detection distance data is detected The average coordinate of the total of all the coordinates is the center of gravity in the X-axis direction, and the total average coordinate of all the coordinates of the Y-axis coordinates from which the human body detection distance data is detected is the center of gravity in the Y-axis direction. For example, FIG. 9 shows a measurement point 11 stored as a coordinate conversion human body detection distance when the height b shown in FIG. 6 is used as a threshold value. The total value of all X coordinates of the measurement point 11 shown in FIG. 9, which is the target when the threshold value is set to height b, is obtained as an average value, and the average value is obtained by the care recipient 7 or the like. It is determined that the center of gravity of the person on the bed 4 is the X-axis, and all the Y coordinates of the measurement points targeted as the human body detection distance are summed to obtain an average value, and the average value is the bet of the care recipient 7 4. Determine the center of gravity of the Y axis of the person above 4.

  The center of gravity in the X-axis direction can be obtained by ((X-axis coordinate value x) × (total number of measurement points greater than or equal to the threshold in the coordinate x)) / (total number of measurement points greater than or equal to the threshold). Similarly, the center of gravity in the Y-axis direction can be obtained by ((sum of Y-axis coordinate value y × (number of measurement points greater than or equal to threshold value in coordinate y)) / (total number of measurement points greater than or equal to threshold value). Here, x indicates the coordinate in the X-axis direction existing in the range equal to or greater than the threshold, and y indicates the coordinate in the Y-axis direction present in the range equal to or greater than the threshold.

  Next, it is a fall accident prevention step S7. The configuration of the present invention configures the Internet 8 as shown in FIG. 5 so that signals are transmitted to an information terminal 20 such as a personal computer, a mobile phone, a wireless communication device, a remote control, a mobile information terminal 21 such as a smartphone, and the like. It has become. In this step, before the cared person 7 or the patient who once slept on the bed 4 falls from the bed 4, the person who watches the caregiver or the nurse can take action to prevent the fall in a timely manner. In the unlikely event of a fall, measures are taken to absorb the impact of the fall before colliding directly with the floor.

  First, it is determined whether the center of gravity of the human body such as the cared person 7 is the attention area B, the danger area B, the safety area C surrounded by the attention area B, or the fall area D divided in the betting area registration step S3. When it is determined that the center of gravity of the human body such as the cared person 7 exists in the safety area c, no signal is transmitted from the control box 3, but when the center of gravity of the human body such as the cared person 7 exists in the attention area b Transmits a warning signal to the information terminal 20 such as a personal computer that can be notified to the caregiver or nurse from the control box 3 or the portable information terminal 21 such as a mobile phone, a wireless communication device, or a smartphone, and the received information In the terminal 20 and the portable information terminal 21, an alarm such as an alarm by a buzzer sound, an alarm by lighting a lamp or the like, an alarm by e-mail, etc. is issued.

  If it is determined that the center of gravity of the human body such as the cared person 7 exists in the danger area (a), a danger alerting signal is sent from the control box 3 to the information terminal 20 and the portable information terminal 21 that can notify the caregiver or nurse. In the information terminal 20 and the portable information terminal 21 that have been transmitted and received, an alarm by a sound such as a buzzer, an alarm by lighting a lamp or the like, an alarm by character display, and on the left and right sides or one side of the bed 4, An operation signal is transmitted to the impact absorbing device 22 at the time of falling from the bed 4 surface, and the received impact absorbing device 22 at the time of falling receives a flat mat 23 for absorbing the impact at the time of falling instantaneously. It operates so that the restraint state of 23 is released and it lays in the fall area D which is the floor surface 30 of the bedside. Thereby, the cared person 7 and the patient can be avoided from the fall accident from the bed 4 for 24 hours. The shock absorbing mat 23 can be operated so as to be laid on the floor surface 30 by a remote control operation by a caregiver or the like when the attention area b is detected.

  When it is determined that the center of gravity of the human body exists in the danger area (i), the distance measurement data can be stored as an image with shades of color, and an arbitrary value that is set before and after changing from the danger area (i) to the fall area (d) is stored. The time can be selected and redisplayed.

  From the above, the control box 3 records the data transmitted from the distance image sensor 2, converts the data into three-dimensional coordinates, and places the bet 4 and its surrounding area in the danger area a, the attention area b, the safety area c, It registers with the fall area d and coordinates, registers the distance when no one is present as distance reference data, registers the number of distance measuring sensors 5 that determine the presence of the person, and sets a threshold in the height direction for determining the center of gravity of the human body. Register, calculate and store the position of the center of gravity of the person from the range equal to or greater than the threshold, determine which area on the bed 4 the position of the center of gravity is, and determine that the determination result is the danger area A or the attention area B If it is determined, it has a function of transmitting a signal to the information terminal 20 and the portable information terminal 21.

  Next, an example of a method for using the bed betting person monitoring method 1 or the apparatus thereof according to the present invention will be described. 2, the distance image sensor 2 is first installed on the ceiling 32 on the bed 4, the control box 3 is installed on the wall 31, and the shock absorbing mat 23 is installed on the existing bed 4, as shown in FIG. As shown in FIG. 5, the information terminal 20 such as a personal computer or the portable information terminal 21 installed in a room different from the bed setting room is configured to be able to communicate with the Internet 8.

  The distance image sensor 2 has, for example, a time-off-flight distance measuring sensor 5 using a total of 19,200 infrared rays of 160 horizontal x 120 vertical, and has a measurement accuracy of up to 1 cm. Use a sensor with specifications that always measure 30 times per second. Then, the bed 4 and the area around the bed are set to be a measurement range.

  Next, a setting before use is performed by an operator. The bet 4 and its surrounding area are input on the coordinates such as the danger area b, the caution area b, the safety area c, the fall area d, and the distance image sensor 2 measures the distance in the absence of a person, and the distance is tertiary. A threshold value in the height direction for obtaining the center of gravity of the person by selecting and inputting the minimum number of distance measuring sensors 5 for performing the original coordinate conversion to obtain distance reference data, and determining that a person is present When the center of gravity of the person exists in the dangerous area b or the attention area b, an operation of inputting the signal transmission destination is performed. It can also be set to use only at night when the number of people on the tour is small.

  After performing the above installation and operation, the bed occupant monitoring method 1 or apparatus of the present invention continuously monitors a person on the bed 4 such as the cared person 7 without violating privacy for 24 hours. The person 7 and the patient can be prevented from falling from the bed 4. Caregivers and nurses do daily work even if they are not clear about the care recipient or patient, and receive care signals or danger alert signals from the information terminal 20 or the portable information terminal 21 as soon as they receive care. It is possible to go to the person 7 or the patient and take an appropriate response. When a signal for alerting is received, the mat 23 for shock absorption can be laid on the floor surface 30 by the remote controller. In the case of the signal for warning the danger, the mat 23 for absorbing shock is automatically laid on the floor surface 30. As a result, the burden on the caregiver and the nurse can be greatly reduced, and the cared person 7 and the like can be relieved from being injured in an accident caused by the fall.

DESCRIPTION OF SYMBOLS 1 Bed betting person monitoring method 2 Distance image sensor 3 Control box 4 Bet 5 Distance measuring sensor 6 Information processing equipment 7 Caregiver 8 Internet 10 Bed peripheral part 11 Measurement point 20 Information terminal 21 Portable information terminal 22 Shock absorber at the time of fall 23 Mat 30 Floor 31 Wall 32 Ceiling B Hazardous area B Caution area C Safety area D Falling area

Claims (4)

The measurement range of the distance image sensor capable of measuring the distance of a plurality of locations is set to be a bet and the bet peripheral area in a plan view, and a plurality of measurement points (X-axis direction, A measurement distance data storage step for storing the distance (Z-axis direction) between the distance image sensor and the measurement point separately as measurement distance data (Y-axis direction);
A coordinate conversion step of three-dimensional coordinate conversion and storing as coordinate conversion distance data so that the measurement distance data at all measurement points are the same when the upper surface of the bed is set as a horizontal plane;
In plan view, the vicinity of the bet periphery is a dangerous area, the area near the center of the upper surface of the bet is a caution area, the area surrounded by the caution area is a safety area, and the periphery of the bet is outside the bet periphery. Bet area registration step for registering the area as a fall area;
A distance reference data storage step for storing coordinate conversion distance data for all measurement points as distance reference data in a state where there is no person such as a care recipient in the bet and the area around the bet;
When there is a difference between the coordinate conversion distance data and the distance reference data at all measurement points, it is determined that a person such as a cared person is present in the bet and the area around the bet. A person presence sensing step in which a person such as a caregiver judges that there is no bet and the area around the bet;
When it is determined in the human presence detection step that a human is present, an arbitrary height higher than the upper surface of the bed is set as a human body detection height, and the human body detection height is subtracted from coordinate conversion distance data at all measurement points. The human body detection distance data is stored, the average coordinate of all the coordinates of the X axis coordinates from which the human body detection distance data is detected is defined as the center of gravity in the X axis direction, and the Y axis coordinates from which the human body detection distance data is detected A human body centroid position setting step in which the average coordinate of the total of all the coordinates is the centroid in the Y-axis direction;
When the coordinates of the center of gravity position of the human body exist in the caution area, a warning signal is transmitted to an information terminal that can be notified to a caregiver or a nurse, and the coordinates of the center of gravity position of the human body exist in the danger area Includes a step of preventing a fall accident by transmitting a signal for raising a danger to an information terminal capable of notifying a caregiver or a nurse and / or transmitting an operation signal of a shock absorber during a fall. The bed occupant monitoring method.   When the shock absorbing method of the impact absorbing device at the time of falling receives the operation signal, the shock absorbing mat that has been locked in a standing state beside the bed is released and the shock absorbing mat is laid on the floor around the bed. The method for monitoring a bed occupant according to claim 1, wherein the method is a method. The measurement range of the distance image sensor capable of measuring the distance of a plurality of locations is set to be a bet and the bet peripheral area in plan view, and a plurality of measurement points (X-axis direction) on the bet and the bet peripheral area are set. Measurement distance data storage means for storing the distance (Z-axis direction) between the distance image sensor and the measurement point separately as measurement distance data,
Coordinate conversion means for three-dimensional coordinate conversion and storing as coordinate conversion distance data so that the measurement distance data at all measurement points are the same when the upper surface of the bed is set as a horizontal plane;
In plan view, the vicinity of the bet periphery is a dangerous area, the area near the center of the upper surface of the bet is a caution area, the area surrounded by the caution area is a safety area, and the periphery of the bet is outside the bet periphery. Bet area registration means for registering the area as a fall area;
Distance reference data storage means for storing coordinate conversion distance data for all measurement points as distance reference data in a state where there is no person such as a care recipient in the bet and the area around the bet;
When there is a difference between the coordinate conversion distance data and the distance reference data at all measurement points, it is determined that a person such as a cared person is present in the bet and the area around the bet. A person presence sensing means for judging that a person such as a caregiver does not exist in the bet and the area around the bet;
When it is determined in the human presence detection step that a human is present, an arbitrary height higher than the upper surface of the bed is set as a human body detection height, and the human body detection height is subtracted from coordinate conversion distance data at all measurement points. The human body detection distance data is stored, the average coordinate of all the coordinates of the X axis coordinates from which the human body detection distance data is detected is defined as the center of gravity in the X axis direction, and the Y axis coordinates from which the human body detection distance data is detected A human body centroid position setting means having the average coordinate of all the coordinates of the centroid in the Y-axis direction,
When the coordinates of the center of gravity position of the human body exist in the caution area, a warning signal is transmitted to an information terminal that can be notified to a caregiver or a nurse, and the coordinates of the center of gravity position of the human body exist in the danger area Comprises a means for including a fall accident prevention means for transmitting a signal for raising a danger to an information terminal capable of notifying a caregiver or a nurse and / or transmitting an operation signal of a shock absorber at the time of fall. A bed occupant monitoring device.   The impact-absorbing device at the time of falling is an apparatus for releasing the impact-absorbing mat that is locked in a standing state next to the bed and laying the impact-absorbing mat on the floor around the bed at the same time as receiving the operation signal. The bed occupant monitoring device according to claim 3.

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