JP4606630B2 - Rise detection device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a rise detection device.
[0002]
[Prior art]
In hospitals and other facilities, inpatients are generally laid down in bed one by one. Some inpatients are unable to get up on their own, or who are not completely awake from anesthesia for surgery. At present, various systems have been proposed for ensuring patient safety by detecting that a person who cannot stand up by himself or who has not completely awakened tries to get up from the bed.
[0003]
As a system for detecting the rise of a patient, there is a system in which a surveillance camera is provided in a hospital room and a nurse monitors the behavior of the patient at a nurse station. In addition, as disclosed in Japanese Patent Laid-Open No. 2000-271098, an infrared sensor is provided on the upper part of the bed to detect that the patient gets up or stands on the bed. A system for detecting that a patient is getting up with an infrared sensor detects rising by using a part of the body that blocks infrared rays when the patient gets up.
[0004]
[Problems to be solved by the invention]
However, monitoring the behavior of a patient with a surveillance camera not only places a heavy burden on nurses and the like, but may also infringe on the privacy of the patient. In addition, it is difficult to install the infrared sensor at an appropriate position in the system that detects that the patient has risen using the infrared sensor because the position where the infrared ray is blocked by the patient's rising differs depending on the patient's physique. There were drawbacks.
[0005]
The present invention has been made in view of the above points, and an object of the present invention is to provide a rise detection device that can accurately detect a rise regardless of the physique of the patient and can ensure the safety of the patient reliably. To do.
[0006]
In addition, the present invention can easily set the optimal condition for the patient and can obtain higher detection accuracy even when the rising detection condition is changed according to different conditions such as the physique for each patient. An object is to provide an apparatus.
[0007]
[Means for Solving the Problems]
In order to solve the above-described problems and achieve the object, the rising detection device according to the first aspect of the present invention includes a plurality of pressure sensors that detect a change in pressure applied to a surface in contact with a human body in a bed, and the plurality of pressure sensors. When any one of the pressure sensors detects a change in pressure equal to or greater than a first threshold value, time-measurement means for starting time measurement for a predetermined length of time, and pressure changes detected by the plurality of pressure sensors; Alarm control means for controlling an alarm device based on the time measured by the time measuring means, and at least a part of the plurality of pressure sensors constitutes a group, and the alarm control means When any of the pressure sensors constituting the group detects a change in pressure equal to or greater than a second threshold before the time measuring means completes the time measurement for the predetermined length, Characterized in that to output an alarm broadcast unit.
[0008]
According to the first aspect of the present invention, a group is formed before a predetermined length of time has elapsed after any of the plurality of pressure sensors detects a change in pressure equal to or greater than the first threshold value. An alarm can be output when any of the pressure sensors to be detected detects a change in pressure equal to or greater than the second threshold value.
[0009]
According to a second aspect of the present invention, in the rising detection device, the pressure sensor constituting the group detects a change in pressure within a predetermined range set including a central portion of a surface contacting the human body in the bed. It is characterized by being.
[0010]
According to the second aspect of the present invention, the pressure sensor for detecting a change in pressure within a predetermined range including the central portion of the surface in contact with the human body in the bed has a pressure equal to or higher than the second threshold value. An alarm can be output when a change is detected.
[0011]
The rising detection device according to a third aspect of the present invention further includes an entrance detection means for detecting that a person has entered the bed, and the alarm control means has the person entering the bed by the entrance detection means. After the fact is detected, a process for outputting an alarm is started based on a change in pressure detected by the pressure sensor.
[0012]
According to the third aspect of the present invention, it is possible to detect the rising only for the change in pressure after the person enters the bed.
[0013]
The rising edge detection device according to the invention of claim 4 further includes at least one of the first threshold value, the second threshold value, a sensor constituting the group, and a time length counted by the timing means. An alarm generation condition changing means for changing an alarm condition including one is provided.
[0014]
According to the fourth aspect of the present invention, it includes at least one of the first threshold value, the second threshold value, a sensor constituting the group, and a length of time measured by the timing means. Alarm conditions can be changed.
[0015]
The rising edge detection device according to the invention of claim 5 is characterized in that the alarm generation condition changing means changes the alarm condition according to one or both of a medical condition and a physique of a person using a bed. To do.
[0016]
According to the fifth aspect of the present invention, the alarm condition can be changed in accordance with either or both of the medical condition and / or physique of the person using the bed.
[0017]
DETAILED DESCRIPTION OF THE INVENTION
Exemplary embodiments 1 to 3 of a rising detection device according to the present invention will be described below in detail with reference to the accompanying drawings.
[0018]
(Embodiment 1)
FIG. 1 is a diagram common to the embodiments of the present invention, and is a diagram showing a configuration example of a rising edge detection device of the present invention. The rising detection device shown in FIG. 1 is provided with a personal computer (personal computer) 101 housed in a dedicated box in each bed 1 installed in a hospital room, and the personal computer 101 is provided in a communication processing device 104 provided in a nurse center. The monitoring device 102 is connected via the converter 103.
[0019]
In the configuration example shown in FIG. 1, a pressure sensor not shown in FIG. 1 is provided in the bed 1, and the pressure sensor constitutes a rising detection device together with the personal computer 101. The change in the pressure applied to the bed 1 detected by the pressure sensor is input to the personal computer 101, and the personal computer 101 performs an arithmetic processing based on the change in the pressure to detect that the patient in the bed 1 is performing an operation to stand up. To do. The personal computer 101 has a warning function that emits a speaker and a buzzer sound, and detects the rise of the patient and emits a buzzer sound.
[0020]
Further, the personal computer 101 notifies the nurse center monitoring device 102 that the rising of the patient has been detected. In the illustrated configuration example, a personal computer is also used as the monitoring device 102, and the state of the patient imaged by a camera (not shown) is captured only when a rising edge is detected on the screen of the personal computer.
[0021]
FIG. 2 is a block diagram illustrating a configuration of the rising edge detection apparatus according to the first embodiment. FIG. 3 is a view showing the arrangement of the pressure sensor (hereinafter simply referred to as a sensor) shown in FIG. 2 in the bed. As shown in FIG. 2, the rising edge detection device of the first embodiment includes a plurality of sensors 2 that detect a change in pressure, and any one of the plurality of sensors 2 indicates a change in pressure that is equal to or greater than a first threshold value. The timer 202 which starts time-measurement when it detects, and the control part 201 which controls the alarm device 203 based on the change of the pressure which the sensor 2 detected, and the time measured by the timer 202 are provided.
[0022]
Note that the sensor 2 according to the first embodiment is a pressure sensor, and can detect a change with time of a continuously detected pressure. Further, the control unit 201, the timer 202, the alarm device 203, and the speaker 204 in the configuration shown in FIG. 1 are configured as the personal computer 101 shown in FIG.
[0023]
Further, in the rising detection device of the first embodiment, the alarm sound output from the alarm device 203 is output through the speaker 204 provided in the hospital room and issues a warning to the patient who is about to stand up or completely from anesthesia. Encourage patients who are not awake to wake up.
[0024]
Furthermore, the rising edge detection apparatus according to the first embodiment branches the control signal output from the control unit 201 to the alarm device 203 and controls the monitor 205 and the speaker 206 provided in the nurse center. Under the control of the control unit 201, the state of the patient is displayed on the monitor 205 only when the alarm 203 is issuing an alarm, or the nurse center speaker 206 and the patient room speaker 204 are connected to the patient in the patient room from the nurse center. Can be called.
[0025]
Next, the arrangement of the sensor 2 in the bed 1 will be described with reference to FIG. The arrangement of the sensor 2 shown in FIG. 3 is common to the first to third embodiments. As shown in FIG. 3, the sensor 2 of the first embodiment includes sensors 2a, 2b, 2c, 2d, 2e, 2f, 2g, 2h, 2i, 2j, 2k, 2l, 2m, 2n, 2o, and 2p. It consists of 16 sensors. And sensor 2m, 2n, 2o of sensors 2a-2p comprises a group. In the first embodiment, the sensors 2a to 2p are provided on the back surface of the surface of the bed 1 that contacts the human body (hereinafter referred to as the bed surface), and changes in pressure applied to the bed surface are detected.
[0026]
The sensors 2m, 2n, and 2o constituting the group are installed in a predetermined range A that is set to include the central portion of the bed surface that contacts the human body in the bed 1. The range A is set as a range in the bed 1 that is generally highly likely to be located under the patient's body. In particular, in the first embodiment, the position corresponding to the waist when the patient sleeps on the bed 1. It is.
[0027]
Further, the first embodiment uses rectangular sensors 2a to 2p as shown in FIG. 3, and the sensors 2p, 2m, and 2b are arranged so that the longitudinal direction of the sensor 2 is along the longitudinal direction of the bed 1 at the center of the bed surface. 2n and 2o were arranged, and sensors 2a to 2l were arranged at both ends with respect to the central portion so that the longitudinal direction of the sensor 2 was along the lateral direction of the bed 1. The number and arrangement of the sensors 2 according to the first embodiment are set for the purpose of detecting the movement of the patient to stand up with the minimum number of sensors.
[0028]
As described above, the timer 202 starts measuring time when any of the sensors 2a to 2p detects a pressure change equal to or higher than the first threshold value. When the time measured by the timer 202 is within a predetermined range, the control unit 201 detects that a change in pressure exceeding the second threshold is detected by the sensors 2m, 2n, and 2o constituting the group. From this, it is detected that the patient is about to stand up and the alarm device 203 outputs an alarm.
[0029]
Next, the above-described algorithm for detecting the rise of the patient will be described. In general, when a person tries to get up from a bed, the following procedure is performed.
(1) Move your body (hold your hand on the bed, move to the left and right of the bed)
(2) Raise the body from the bed (apply local force to the hands, feet, and waist)
[0030]
During the operation of moving the body in (1), the patient touches or moves any part of the bed 1. The pressure applied to any part of the bed 1 changes relatively greatly depending on the movement of the patient. Any of the sensors 2 provided on the bed 1 detects a relatively large pressure change as a pressure change equal to or greater than the first threshold value (ΔPth1).
[0031]
Further, the patient performs the operation (2) following the operation (1). During the operation (2), the patient applies force to the body parts such as hands, feet, and waist, and the pressure applied to the portion of the range A corresponding to the waist of the bed 1 changes relatively large. For this reason, one of the sensors 2m, 2n, 2o constituting the group of the sensors 2 provided on the bed 1 makes a relatively large pressure change as a pressure change equal to or greater than the second threshold value (ΔPth2). Detect.
[0032]
Furthermore, since the movement of (1) and the movement of (2) are performed as a series of movements of the patient, the movement of (1) and the movement of (2) are relatively short, such as 1 to 2 seconds to 10 seconds. Wake up at time intervals. The inventors of the present invention pay attention to this point, and after any pressure change of ΔPth1 or more is detected by any of the sensors 2, any of the sensors 2m, 2n, and 2o that constitute the group within a predetermined range of time is detected. When a pressure change greater than or equal to ΔPth2 is detected, it is determined that the patient is about to stand up.
[0033]
In the first embodiment, the time interval from the pressure change detection of ΔPth1 or more to the pressure change detection of ΔPth2 or more when it is determined that the patient is about to stand up is set from 1, 2 seconds to 10 seconds. Further, ΔPth1 and ΔPth2 may be set to different values or the same value. However, according to the experiments by the inventors of the present invention, it has been found that the change in pressure applied to the bed by the operation (1) is often larger than the change in pressure applied to the bed by the operation (2). Yes. Therefore, the relationship between ΔPth1 and ΔPth2 is
ΔPth1> ΔPth2
May be defined.
[0034]
According to the rising detection algorithm of the first embodiment described above, since the rising is detected based on the change in pressure applied to the bed, the rising can be detected regardless of the physique of the patient. In addition, it is possible to detect the rising while the patient is moving up. For this reason, the rising edge detection apparatus according to the first embodiment can detect the rising edge earlier than a system that detects that the patient has risen with an infrared sensor, for example. Early detection of the rising edge works particularly effectively to ensure the safety of those who cannot move freely by themselves, such as hospitalized patients.
[0035]
Further, according to the rising edge detection algorithm of the first embodiment, only when the pressure change of ΔPth1 and the pressure change of ΔPth2 occur within a short time such as 1, 2 to 10 seconds, the patient can perform ΔPth1, The rise is detected assuming that a pressure change of ΔPth2 is caused in the bed. For this reason, the stand-up detection device according to the first embodiment can reduce erroneous determination that an operation other than the stand-up, such as a nurse putting weight on the bed, is a stand-up.
[0036]
Next, a method of detecting the rising by the rising detection device of the first embodiment will be described using the flowchart of FIG. According to the process shown in the flowchart of FIG. 4, first, the control unit 201 determines whether or not the change in pressure detected by any of the sensors 2 is equal to or greater than ΔPth1 (step S401). And as a result of this judgment, when the pressure change more than (DELTA) Pth1 is not detected (step S401: No), it waits until it detects.
[0037]
When it is determined in step S401 that a pressure change equal to or greater than ΔPth1 has been detected (step S401: Yes), the control unit 201 activates the timer 202 and starts measuring time (step S402). Then, after the timer 202 is started, it is determined whether or not a predetermined time of about 1 to 2 seconds has elapsed (step S403). If the time has elapsed as a result of this determination (step S403: Yes), the process waits until a pressure change equal to or greater than ΔPth1 is detected.
[0038]
Further, when it is determined that the predetermined time has not elapsed in step S403 (step S403: No), the control unit 201 determines whether or not a pressure change equal to or greater than ΔPth2 is detected (step S404). As a result of this determination, if a pressure change of ΔPth2 or more is not detected (step S404: No), it is determined in step S403 whether the time measured by the timer 202 has elapsed.
[0039]
On the other hand, if it is determined in step S404 that a pressure change equal to or greater than ΔPth2 has been detected (step S404: Yes), whether or not the sensor that has detected the pressure change greater than or equal to ΔPth2 is included in the sensor (group sensor) constituting the group. (Step S405). When the sensor is included in the group sensor (step S405: Yes), the control unit 201 controls the alarm device 203 to output an alarm (step S406).
[0040]
If it is determined in step S405 that the sensor that has detected a pressure change equal to or greater than ΔPth2 is not a group sensor (step S405: No), the control unit 201 determines again in step S403 whether the time measured by the timer 202 has elapsed. To do.
[0041]
The rise detection device of the first embodiment described above can detect a rise when the patient is about to stand up regardless of the patient's physique, and can reliably protect the patient from troubles that may occur due to the rise. Further, by detecting the rising only when the pressure is changed by a series of actions of the patient, it is possible to reduce erroneous determination of the rising and increase the reliability of the rising detection device.
[0042]
(Embodiment 2)
Next, the rising edge detection device of the second embodiment will be described. Note that the rise detection device of the second embodiment includes the same configuration as the rise detection device of the first embodiment described above. In the description of the second embodiment, the illustration and description of a configuration similar to those of the first embodiment are omitted.
[0043]
FIG. 5 is a block diagram for explaining the configuration of the rising edge detection apparatus according to the second embodiment. The rising detection device of the second embodiment further includes an entrance detection unit 501 that detects that a person has entered the bed 1 in addition to the rising detection device of the first embodiment described with reference to FIG. And the control part 201 of Embodiment 2 outputs the warning based on the change in the pressure detected by the sensor 2 after the bed detection part 501 detects that a person has entered the bed 1. Start.
[0044]
The entrance detection unit 501 of the second embodiment is configured as a part of the arithmetic processing device of the control unit 201. The entrance detection unit 501 inputs, for example, the pressure detected by the sensor 2, and when any of the sensors 2 a to 2 p no longer detects a pressure exceeding a preset very low pressure (bed-out pressure), the entrance to the timer 202 is detected. Start timing. Then, when the time during which a pressure equal to or greater than the bed leaving pressure is not detected continues for a predetermined time, it is possible to detect the bed leaving of the patient by determining that the patient has left the bed 1 (leaved the bed).
[0045]
Also, the bed detection unit 501 detects a time when at least a part of the sensors 2a to 2p continuously detects a pressure (bed entry pressure) larger than a preset bed leaving pressure for a predetermined time or more after the bed leaving determination. 202 starts the timing. Then, when a pressure equal to or higher than the bed entry pressure is continuously detected for a predetermined time, it is possible to detect the patient's bed entry by determining that the patient has entered the bed again (bed in).
[0046]
The control unit 201 starts the rising detection process described in the first embodiment after the patient's entrance is detected by the entrance detection unit 501. That is, the second embodiment does not detect the rising until the patient finishes entering the bed 1. According to the second embodiment as described above, it is possible to eliminate the erroneous determination of the change in pressure applied to the bed 1 when the patient enters the bed as the rising of the patient, and to further improve the reliability of the rising detection device. Can do.
[0047]
As the bed leaving pressure, for example, it is conceivable to set the pressure on the bed surface by a futon or a pillow placed on the bed 1. Further, as the bed entry pressure, for example, it may be set to a pressure applied to the bed surface when a person puts the entire weight on the bed 1.
[0048]
Further, in the second embodiment, when a pressure equal to or greater than the bed entry pressure is detected in a relatively wide range of the bed surface, it is determined that the bed is entered, so that the object is placed on the bed 1 or the bed 1 is handed. Can be prevented from being erroneously determined to enter the floor when the bed 1 is used or the bed 1 is used instead of a bed. In addition, when the bed pressure is continuously detected when judging the bed entry, the bed movement operation may be mistakenly determined to be rising by setting a sufficient time for the patient to complete the bed entry. Can be prevented.
[0049]
Next, a method for detecting the rising edge by the rising edge detection apparatus according to the second embodiment will be described with reference to the flowchart of FIG. According to the process shown in the flowchart of FIG. 6, first, the control unit 201 determines whether or not the entrance detection unit 501 has detected entrance of the patient to the bed 1 (step S601). As a result of the determination, when the floor is not detected (step S601: No), the process waits until the floor is detected.
[0050]
On the other hand, if it is determined in step S601 that entry is detected (step S601: Yes), the control unit 201 determines whether or not the change in pressure detected by any of the sensors 2 is equal to or greater than ΔPth1. (Step S602). As a result of this determination, if no pressure change of ΔPth1 or more is detected (step S602: No), the process waits until it is detected.
[0051]
If it is determined in step S602 that a pressure change equal to or greater than ΔPth1 has been detected (step S602: Yes), the control unit 201 activates the timer 202 and starts measuring time (step S603). Then, after the timer 202 is activated, it is determined whether or not a predetermined time of about 1 to 2 seconds has elapsed (step S604). If the time has elapsed as a result of this determination (step S604: Yes), the process waits until a pressure change equal to or greater than ΔPth1 is detected.
[0052]
In addition, when it is determined that the predetermined time has not elapsed in Step S604 (Step S604: No), the control unit 201 determines whether or not a pressure change of ΔPth2 or more is detected (Step S605). As a result of this determination, if a pressure change equal to or greater than ΔPth2 is not detected (step S605: No), it is determined in step S604 whether the time measured by the timer 202 has elapsed.
[0053]
On the other hand, if it is determined in step S605 that a pressure change equal to or greater than ΔPth2 has been detected (step S605: Yes), whether or not the sensor that has detected a pressure change greater than or equal to ΔPth2 is included in a sensor (group sensor) constituting the group. It is judged (step S606). If the sensor is included in the group sensor (step S606: Yes), the control unit 201 controls the alarm device 203 to output an alarm (step S607).
[0054]
If it is determined in step S606 that the sensor that has detected a pressure change equal to or greater than ΔPth2 is not a group sensor (step S606: No), the control unit 201 determines again in step S604 whether the time measured by the timer 202 has elapsed. To do.
[0055]
The rising detection device according to the second embodiment described above can prevent the change in pressure applied to the bed surface from being erroneously determined as rising during the operation of entering the floor, and can further improve the reliability of the rising detection device.
[0056]
(Embodiment 3)
Next, a rising edge detection apparatus according to Embodiment 3 will be described. Note that the rise detection device of the third embodiment includes the same configuration as the rise detection device of the first embodiment described above. In the description of the third embodiment, the illustration and description of a configuration similar to those of the first embodiment are omitted.
[0057]
FIG. 7 is a block diagram for explaining the configuration of the rising edge detection apparatus according to the third embodiment. The rising edge detection device according to the third embodiment is further provided with a condition changing unit 701 that changes the alarm condition in addition to the rising edge detection device according to the first embodiment described with reference to FIG. The alarm condition of the present embodiment includes the values of ΔPth1, ΔPth2, and the length of time that the timer 202 starts measuring time from the detection of ΔPth1 in the first embodiment. Furthermore, the alarm condition may include the bed pressure, the bed pressure, and the duration of the bed pressure when it is determined that the bed is in bed. In the third embodiment, a part of the rising detection device is configured as a personal computer, and the condition changing unit 701 is a display screen and a keyboard of the personal computer.
[0058]
Further, in the third embodiment, the condition changing unit 701 is configured so that the alarm condition can be changed according to the patient's medical condition and physique. When changing the alarm condition depending on the patient's medical condition, the condition changing unit 701 displays a warning condition changing screen for inputting the medical condition on the display screen. In the change screen, for example, “absolute rest”, “medium”, “walkable”, “sleeping due to anesthesia” are set, and the operator has set the patient's medical condition. Select from.
[0059]
Each of the above items is associated with a combination of alarm conditions, and the control unit 201 sets an alarm condition corresponding to the selected item as a rising detection condition. The combination of the item and the alarm condition may be, for example, setting the values of ΔPth1 and ΔPth2 to be lower for the item of “absolute rest” and closely monitoring the rise of the patient.
[0060]
In addition, for the item “Walkable”, it is conceivable to set ΔPth1 and ΔPth2 to a higher value, and to prevent misjudgment in addition to monitoring the standing of the patient. Further, for the item “sleeping due to anesthesia”, the length of time that the timer 202 starts measuring time from the detection of ΔPth1 is set to a longer value by predicting that the patient operates relatively slowly. It is conceivable to set the conditions for detection of rising in accordance with the medical condition.
[0061]
When the alarm condition is changed depending on the patient's physique, the condition changing unit 701 displays a physique input alarm condition change screen on the display screen. In the change screen, for example, items of physique such as “height: 120 to 130”, “height: 180 to 190”, “weight: 20 kg to 30 kg”, “weight: 90 kg to 100 kg” are set. Select the patient's physique from the set items.
[0062]
Each of the above items is associated with a combination of alarm conditions, and the control unit 201 sets an alarm condition corresponding to the selected item as a rising detection condition. The combination of the item and the alarm condition is, for example, that the change in the pressure applied to the bed surface when the patient stands up is relatively small for the items of “height: 120 to 130” and “weight: 20 kg to 30 kg”. Assuming this, it is conceivable to set the values of ΔPth1 and ΔPth2 low.
[0063]
For items of “height: 180 to 190” and “weight: 90 kg to 100 kg”, ΔPth1 and ΔPth2 are assumed on the assumption that the change in pressure applied to the bed surface is relatively large when the patient stands up. It is conceivable to set the value higher. With the above processing, the rising edge detection apparatus of the third embodiment can set conditions for rising detection appropriate for each patient's physique, and can further improve the accuracy of rising edge detection.
[0064]
Next, a method for detecting the rising edge by the rising edge detection apparatus according to the third embodiment will be described with reference to the flowchart of FIG. According to the process shown in the flowchart of FIG. 8, first, the control unit 201 determines whether or not to change the alarm condition setting (step S801). And when changing alarm conditions (step S801: Yes), it is judged whether alarm conditions are set according to a patient's physique (step S808).
[0065]
As a result of the determination, if the alarm condition is not set according to the physique (step S808: No), it is determined whether the alarm condition is set according to the patient's medical condition (step S813). If it is determined in step S813 that the alarm condition is not set according to the medical condition of the patient (step S813: No), it is determined again whether the alarm condition is to be changed (step S801).
[0066]
If it is determined in step S808 that the alarm condition is set according to the patient's physique (step S808: Yes), the control unit 201 displays a height input screen on the display, for example, and causes the operator to input the height. (Step S809). Next, the control unit 201 displays a weight input screen on the display, and allows the operator to input the weight (step S810).
[0067]
If it is determined in step S808 that the alarm condition is not set according to the patient's physique (step S808: No), it is determined whether the alarm condition is set according to the patient's medical condition (step S813). And when setting alarm conditions according to a medical condition (step S813: Yes), the control part 201 displays a medical condition input screen on a display, and makes an operator input a medical condition (step S814).
[0068]
The control unit 201 determines whether or not the input is completed even when the alarm condition is changed according to any of the physique and the medical condition (step S811), and when it is determined that the input is completed, the input content is changed. Accordingly, the alarm condition is changed (step S812). Then, using the changed alarm condition, the rising detection is started in the same manner as the rising detection device of the first embodiment.
[0069]
That is, the control unit 201 determines whether or not the change in pressure detected by any of the sensors 2 is equal to or greater than ΔPth1 (step S802). As a result of this determination, if no pressure change equal to or greater than ΔPth1 is detected (step S802: No), the process waits until it is detected.
[0070]
If it is determined in step S802 that a pressure change equal to or greater than ΔPth1 has been detected (step S802: Yes), the control unit 201 activates the timer 202 and starts measuring time (step S803). Then, after the timer 202 is activated, it is determined whether or not a predetermined time of about 1 to 2 seconds has elapsed (step S804). As a result of this determination, if time has elapsed (step S804: Yes), the process waits until a pressure change equal to or greater than ΔPth1 is detected.
[0071]
In addition, when it is determined that the predetermined time has not elapsed in Step S804 (Step S804: No), the control unit 201 determines whether a pressure change equal to or greater than ΔPth2 is detected (Step S805). As a result of this determination, if a pressure change equal to or greater than ΔPth2 is not detected (step S805: No), it is determined in step S804 whether the time measured by the timer 202 has elapsed.
[0072]
On the other hand, if it is determined in step S805 that a pressure change equal to or greater than ΔPth2 has been detected (step S805: Yes), whether or not the sensor that has detected the pressure change greater than or equal to ΔPth2 is included in the sensor constituting the group (group sensor). Is determined (step S806). And when it is a sensor contained in a group sensor (step S806: Yes), the control part 201 controls the alarm device 203 and outputs an alarm (step S807).
[0073]
If it is determined in step S806 that the sensor that has detected a pressure change equal to or greater than ΔPth2 is not a group sensor (step S806: No), the control unit 201 determines again in step S804 whether the time measured by the timer 202 has elapsed.
[0074]
The rising detection device of the third embodiment described above can change the alarm condition in accordance with the patient's medical condition and physique, and can detect the rising of the patient more accurately. In addition, since the alarm condition can be changed by inputting the patient's medical condition, physique, etc., even if the operator has no particular knowledge about the correspondence between the patient condition and the alarm condition, the appropriate alarm condition for each patient Can be set.
[0075]
Next, the result of detecting the rising of the patient with the rising detection device of the present invention will be shown. FIG. 9 is a diagram showing data acquired by the rising edge detection device of the present invention. The pressure sensor according to the present embodiment outputs a signal when the pressure changes, and the reading value of the pressure sensor directly indicates a change in pressure. In FIG. 9, the main pressure change among the detected pressure changes is shown as a reading value of the pressure sensor on the vertical axis, and the time is shown in seconds on the horizontal axis.
[0076]
In the figure, a white square mark indicates a pressure detected by the sensor 2h, a white circle plot indicates a pressure detected by the sensor 2j, a white triangle plot indicates a pressure detected by the sensor 2d, and a black rhombus plot Indicates the change in pressure detected by the sensor 2n (which is a group sensor). In addition, the first threshold value th1 and the second threshold value th2 defined in the present embodiment are shown in the drawing.
[0077]
As shown in the figure, when the patient wakes up on the bed, as shown by the range B and the range C in the figure, one of the sensors including the sensor 2n detects a change in pressure equal to or higher than th1, and then continues. Thus, the sensor 2n detects a change in pressure with a magnitude greater than or equal to th2 (th1> th2) within a predetermined time (after two seconds in the example of FIG. 9). The above pressure change detection data corresponds to the condition for outputting an alarm in the present invention. Therefore, from the result shown in FIG. 9, it was confirmed that the rising detection device of the present embodiment can detect that the patient has woken up from the bed.
[0078]
Further, according to FIG. 9, when the patient stands on the bed and walks on the bed, as shown by the range D and the range E in the figure, any of the sensors including the sensor 2n has a pressure equal to or higher than th1. Then, the sensor 2n detects a change in pressure with a magnitude greater than or equal to th2 (th1> th2) within a predetermined time (after 2 seconds in the example of FIG. 9). The above pressure change detection data corresponds to the condition for outputting an alarm in the present invention. Therefore, from the result shown in FIG. 9, it was confirmed that the rising detection device of the present embodiment can detect that the patient got up from the bed and walked.
[0079]
Further, as shown by a range F in FIG. 9, when the patient leaves the bed, that is, leaves the bed, the sensor 2n detects a change in pressure of th1 or more continuously at intervals of 2 seconds or less. Yes. The above pressure change detection data corresponds to the condition for outputting an alarm in the present invention. Therefore, from the result shown in FIG. 9, it was confirmed that the rising detection device of the present embodiment can detect that the patient has left the bed.
[0080]
As described above, the rising detection method performed by the rising detection device described in the first to third embodiments is realized by executing a program prepared in advance by a computer. This program is recorded on a computer-readable recording medium such as a hard disk, floppy disk, CD-ROM, MO, and DVD, and is executed by being read from the recording medium by the computer. The program can be distributed through the recording medium and as a transmission medium via a network such as the Internet.
[0081]
Further, the present invention is not limited to the above-described embodiment. That is, in all of the first to third embodiments, the personal computer 101 is used as the rising detection device. However, the rising edge detection device of the present invention is not limited to using a personal computer, and can be configured by a dedicated device. FIG. 10 is a diagram illustrating an example in which the rising detection device of the present invention is configured using a dedicated alarm generation device.
[0082]
The alarm generation device 1001 illustrated in FIG. 10 may include, for example, the control unit 201 and the alarm device 203 illustrated in FIG. 1 and output an alarm generated by the alarm device 203 to the communication processing device 104. . In addition, only the control unit is provided on the side of the hospital room and an alarm device is provided in the nurse center, and the alarm device in the nurse center inputs the control signal output from the control unit and outputs an alarm in the nurse center. Also good.
[0083]
Furthermore, as shown in FIG. 11, the present invention includes a device 1101 provided with a control unit 201, an alarm device 203, and a speaker 204 on the nurse center side, and the signal of the pressure sensor 2 is connected to the nurse center via an interface (not shown). It may output to the device 1101 on the side. When comprised in this way, the stand-up of the patient in a some bed can be detected by one control part 201, and also the effect that a stand-up detection apparatus can be reduced in cost and simplified is acquired.
[0084]
【The invention's effect】
As described above, the rising edge detection device according to the first aspect of the present invention is configured so that after any one of the plurality of pressure sensors detects a change in pressure equal to or greater than the first threshold, the group is detected within a predetermined time. An alarm can be output when the pressure sensor which comprises comprises detecting the change of the pressure beyond a 2nd threshold value. For this reason, regardless of the patient's physique, the rise can be detected when the patient is about to stand up, and the patient can be reliably protected from troubles that may occur due to the rise. Further, by detecting the rising edge only when the pressure is changed by a series of actions of the patient, it is possible to reduce the erroneous determination of the rising edge and increase the reliability of the rising edge detection device.
[0085]
According to a second aspect of the present invention, in the rising detection device, the pressure sensor installed in a predetermined range including the central portion of the surface in contact with the human body in the bed changes in pressure exceeding the second threshold value. When this is detected, an alarm can be output. For this reason, it is possible to detect the movement of the patient to rise more accurately and to protect the patient more reliably from troubles that may occur due to the rising. In addition, there is an effect that the reliability of the rising detection device can be further increased.
[0086]
The rising detection device of the invention according to claim 3 prevents the change in pressure applied to the bed surface during the operation of entering the floor from being erroneously determined as rising, and can further improve the reliability of the rising detection device. Play.
[0087]
The rising edge detection device of the invention according to claim 4 can change the alarm condition according to each patient, and has an effect that the rising edge of the patient can be detected more accurately.
[0088]
In the rising edge detection device according to the fifth aspect of the invention, the alarm condition can be changed by inputting either or both of the patient's medical condition and physique. Even if the operator has no particular knowledge about the correspondence, it is possible to easily set an appropriate alarm condition for each patient.
[Brief description of the drawings]
FIG. 1 is a diagram showing a configuration example of a rising edge detection device according to the present invention.
FIG. 2 is a block diagram for explaining a configuration of a rising edge detection apparatus according to the first embodiment of the present invention.
FIG. 3 is a diagram for explaining the arrangement of sensors of a rise detection device common to the embodiments of the present invention.
FIG. 4 is a flowchart for explaining a rising edge detection method according to the first embodiment of the present invention;
FIG. 5 is a block diagram for explaining a configuration of a rising edge detection apparatus according to a second embodiment of the present invention.
FIG. 6 is a flowchart for explaining a rising edge detection method according to the second embodiment of the present invention;
FIG. 7 is a block diagram for explaining a configuration of a rising edge detection apparatus according to a third embodiment of the present invention.
FIG. 8 is a flowchart for explaining a rising edge detection method according to a third embodiment of the present invention.
FIG. 9 is a diagram illustrating data acquired by the rising edge detection apparatus of the present invention.
FIG. 10 is a diagram showing another configuration example of the rising edge detection device of the present invention.
FIG. 11 is a diagram showing still another configuration example of the rising edge detection device of the present invention.
[Explanation of symbols]
1 bed
101 PC
102 Monitoring device
103 converter
104 Communication processing device
201 Control unit
202 timer
203 Alarm
204, 206 Speaker
205 monitor
501 Entrance detection unit
701 Condition change part
1001 Alarm generator

Claims (5)

A plurality of pressure sensors for detecting pressure applied to a surface in contact with the human body in the bed, and a predetermined length when the pressure detected by any of the plurality of pressure sensors changes more than a first threshold value; Time measuring means for starting time measurement, and alarm control means for controlling an alarm device based on changes in pressure detected by the plurality of pressure sensors and time measured by the time measuring means,
At least one of the plurality of pressure sensors constitutes a group, and the alarm control means includes any one of the pressure sensors constituting the group before the timing means completes timing of the predetermined length of time. A rising detection device that causes the alarm to output an alarm when a change in pressure equal to or greater than a second threshold is detected. 2. The rising according to claim 1, wherein the pressure sensors constituting the group are configured to detect a change in pressure within a predetermined range set including a central portion of a surface in contact with a human body in the bed. Detection device. Further, it includes an entrance detection means for detecting that a person has entered the bed, and the alarm control means is detected by the pressure sensor after the entrance detection means detects that a person has entered the bed. The rising detection device according to claim 1, wherein a process for outputting an alarm is started based on a change in pressure. Further, an alarm generation condition changing means for changing an alarm condition including at least one of the first threshold value, the second threshold value, a sensor constituting the group, and a length of time measured by the time measuring means. The rise detection device according to any one of claims 1 to 3, further comprising: The rise detection device according to claim 4, wherein the alarm generation condition changing unit changes the alarm condition according to one or both of a medical condition and a physique of a person using a bed.

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