JP2011183121A - Bedsore generation risk presentation device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a bedsore generation risk presentation device which presents information of bedsore generation at suitable timing corresponding to a grade of body movement of a patient. <P>SOLUTION: The bedsore generation risk presentation device includes: a body movement detecting means 20 to detect body movement of a person on a bed 11; a risk presentation device 40 which starts time counting when detecting body movement and presents risk information of bedsore generation when detecting elapse of a prescribed time before detecting the next body movement; and a presentation time elongation means 30 which elongates a time until presenting bedsore generation information corresponding to a grade of detected body movement. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a pressure ulcer occurrence risk presentation device that detects the state of a bedridden person and presents risk information for the occurrence of pressure ulcers.

  Conventionally, in order to prevent bed sores of bedridden elderly people and severely ill patients who have difficulty turning over with their own power, the operation status of elderly people and severely ill patients is monitored and they do not move for a long time, causing pressure ulcers. When it is determined that the risk is increased, various devices have been developed to notify caregivers and managers and to prevent the occurrence of pressure ulcers by turning the elderly or critically ill patients by the caregivers or managers (for example, Patent Document 1). 2).

  In the device disclosed in Patent Document 1, piezoelectric elements are arranged in a matrix on the mat, and heartbeat vibration, breathing vibration, vibration during bed leaving, and vibration due to rolling of a person lying on the mat are detected from the piezoelectric element. Each determination is made based on the magnitude of the signal to be transmitted. Then, measure the duration of the signal that is determined to be a heartbeat vibration that is not effective in preventing pressure ulcers, and a fine body vibration based on respiratory vibration, and issue an alarm if the duration exceeds a predetermined value. It is designed to notify people.

  In the device disclosed in Patent Document 2, a sensor that can detect either the tilt or the amount of movement is directly attached to the body of a person lying on a bed to monitor the movement of the person. And measure the duration of the signal that is determined to be a fine body vibration based on heartbeat and breathing, where vibration is not effective in preventing pressure ulcers, and if the duration exceeds a predetermined value, issue an alarm It is designed to notify people.

Japanese Patent No. 3303426 JP 2004-201758 A

  In the techniques disclosed in the above two patent documents, when a rollback signal that is effective for preventing pressure ulcers is detected during measurement of fine body motion, measurement of the fine body motion is stopped and continued. The time is reset. Then, the measurement starts again from the time when the small body movement is detected again, and an alarm is issued when the continuation of the thin body movement for the same predetermined time as the previous time is measured regardless of the magnitude or number of turn signals. . This allows people lying on the bed to continually roll over and move around on the bed, actually reducing the risk of pressure ulcers and alerting them even if they do not need to report to the caregiver. And the person lying on the bed may be burdened.

  The present invention has been made in view of the above problems, and an object of the present invention is to provide a pressure ulcer development risk presentation device that presents information on the risk of pressure ulcer development at an appropriate timing according to the degree of body movement of the patient. .

  The features of the pressure ulcer occurrence risk presentation device according to claim 1 for solving the above-mentioned problems include body motion detection means for detecting a body motion of a person on the bed, and time measurement when the body motion is detected. A risk presentation device that presents risk information on the occurrence of pressure ulcers when it is detected that a predetermined time has elapsed before detecting motion, and a time until risk information on the occurrence of pressure ulcers is presented according to the detected degree of body movement Presentation time extending means for lengthening the display time.

  A pressure ulcer occurrence risk presentation device according to claim 2 is characterized in that, in claim 1, the body movement detecting means is detected in a predetermined period by the vibration detecting means for detecting vibration on the bed and the vibration detecting means. And a body motion recognition unit for recognizing the body motion of the person on the bed based on the number of times of occurrence of the protrusion vibration. And the risk presentation device subtracts or adds a first predetermined number for each elapse of the predetermined period unless the body movement recognition means recognizes the body movement in each predetermined period of the predetermined period. A body movement counter that counts time, and a presentation device that presents risk information on the occurrence of pressure ulcers when it is detected that the count value of the body movement counter has reached a set value. The body movement is to contain the body movement counter count value changing means for the count value to the second predetermined number addition or subtraction to be recognized during.

  The present invention of the pressure ulcer occurrence risk presentation device according to claim 3 is characterized in that, in claim 2, the vibration detecting means is a load meter, and the protruding vibration frequency measuring means is large based on a load amount detected by the load meter. Measuring the number of occurrences of the protruding vibration having a predetermined value or more.

  A pressure ulcer occurrence risk presentation device according to claim 4 is characterized in that, in claim 2 or claim 3, the count value of the body movement counter is the number of occurrences of the protruding vibrations measured by the protruding vibration frequency measuring means. It is weighted accordingly.

  According to a fifth aspect of the present invention, the pressure ulcer occurrence risk presenting device is characterized in that, in any one of the second to fourth aspects, the count value of the body motion counter is calculated by the body motion recognition means at every predetermined period. When the state recognized and detected as motion appears continuously or when it does not appear continuously, it is weighted according to the number of consecutive occurrences or the number of consecutive occurrences that did not appear. .

  The invention of the pressure ulcer occurrence risk presentation device according to claim 6 is characterized in that in any one of claims 1 to 5, the present invention has a away bed determining means for determining a bed left of a person on the bed, The presence / absence determination means resets the time count of the risk presentation device when it determines the person leaving the bed.

  A pressure ulcer occurrence risk presentation device according to claim 7 is characterized in that, in claim 6, the presence / absence floor determination means performs determination of the presence / absence of a person on the bed based on a load amount detected by the load meter. It is.

  The invention of a pressure ulcer occurrence risk presentation device according to claim 8 is characterized in that, in any one of claims 2 to 7, the risk presentation device has a count value of the body movement counter at a predetermined threshold value. When this is detected, it has a reporting means for reporting to a preset reporting destination.

  A feature of the pressure ulcer occurrence risk presentation device according to claim 9 is that in claim 2, the vibration detecting means is an accelerometer arranged so as to be able to measure the motion acceleration of the person on the bed. .

  A feature of the pressure ulcer occurrence risk presentation device according to claim 10 is that, in claim 2, the vibration detecting means is a piezoelectric film arranged so as to be able to measure a person's movement on the bed.

  According to the pressure ulcer occurrence risk presentation device according to claim 1, the body motion of the person on the bed is detected by the body motion detecting means. Then, when the time until the next body movement is detected is measured and continued for a predetermined time, information on the risk of pressure ulcer occurrence is presented by the risk presentation device. However, at this time, the predetermined time is set by the presentation time extension means so as to become longer according to the detected degree of body movement. This makes it possible to provide risk information according to the state of the person's body movement on the bed at an appropriate timing, and can call the caregiver only when it is really necessary to turn over. The burden on the upper person can be greatly reduced.

  According to the invention of the pressure ulcer occurrence risk presentation device according to claim 2, the vibration detecting means detects vibration on the bed, and the protruding vibration frequency measuring means has a magnitude greater than a predetermined value in the vibration detected by the vibration detecting means. The number of occurrences of protrusion vibration is measured every predetermined period. The body movement recognition means recognizes the body movement based on the number of occurrences of the protrusion vibration, the presentation time extension means adds or subtracts the count value according to the degree of the body movement, and the presentation device sets the time corresponding to the count value. Presents pressure ulcer risk information. In this way, the count value of the counter is changed according to the degree of body movement measured every predetermined period, and the time until risk information is presented based on the count value is determined. This makes it possible to accurately determine the risk of pressure ulcers taking into account body movements.

  According to the invention of the pressure ulcer occurrence risk presenting device according to claim 3, the vibration detecting means is constituted by the load meter, so that it can be selected from abundant commercial products and can be handled at low cost.

  According to the pressure ulcer occurrence risk presentation device according to claim 4, attention is paid to the number of protruding vibrations measured by the protruding vibration frequency measuring means as a basis for determining body movement, and weighting is performed according to the number of protruding vibrations. Determine the count value of the counter. Thereby, the state of the body movement of the person on the bed can be accurately grasped, and the time until the risk information is presented can be accurately increased by an appropriate length according to the body movement state.

  According to the pressure ulcer occurrence risk presenting device according to claim 5, the count value of the body motion counter appears when the body motion recognized by the body motion recognition means for every predetermined period appears continuously or continuously. If not, weighting is performed based on the number of consecutive occurrences or the number of consecutive occurrences that did not appear. In other words, if it appears continuously, people on the bed often move and the risk of pressure ulcers is thought to decrease, so the risk of pressure ulcers decreases according to the number of times the body movement counter appears continuously. Weight the direction. In addition, if body movement does not appear continuously, the risk of pressure ulcers may increase significantly with the number of times depending on the person's symptoms, so the count value of the body movement counter also appears continuously. Weigh the direction in which the risk of pressure ulcers increases according to the number of times they did not. Thereby, the state of the body movement of the person on the bed can be accurately grasped, and the time until the risk information is presented can be accurately changed by an appropriate length according to the body movement state.

  According to the pressure ulcer occurrence risk presentation device according to the sixth aspect of the present invention, the presence / absence determination unit of the person on the bed is provided, and the time of the risk presentation device is reset when the person on the bed leaves the bed. As a result, no computation is performed during getting out of bed and there is no waste.

  According to the pressure ulcer occurrence risk presenting device according to claim 7, the presence / absence floor determination means according to claim 6 performs the determination of the presence / absence bed based on the load amount detected by the load meter, and therefore vibration detection for detecting vibration on the bed. It can be shared with the load cell used for the means and is efficient.

  According to the pressure ulcer occurrence risk presenting device according to claim 8, when the count value of the body movement counter reaches a predetermined threshold, the reporting means reports to a preset report destination, so that the risk of pressure ulcer occurrence can be ensured. Or you can contact the administrator.

  According to the pressure ulcer occurrence risk presentation device according to the ninth aspect of the present invention, since the vibration detecting means is an accelerometer, it can be established by a simple and inexpensive system and is efficient.

  According to the pressure sore occurrence risk presentation device according to claim 10, since the vibration detecting means is a piezoelectric film arranged so as to be able to measure the movement of the person on the bed, the movement of the person on the bed over the entire surface of the bed. Can be detected accurately, and the risk management of pressure ulcers can be accurately managed.

It is a figure which illustrates typically the pressure sore generation risk presentation apparatus of this embodiment. It is the flowchart 1 of 1st, 2nd embodiment. It is the flowchart 2 of 1st Embodiment. It is a figure of the time-series load value data example. It is the flowchart 3 of 2nd Embodiment.

  A pressure ulcer occurrence risk presentation device according to a first embodiment of the present invention will be described with reference to FIGS. 1 to 4. The pressure ulcer occurrence risk presentation device 10 includes a bed leaving determination means 15, a body motion detection means 20, a risk presentation device 40, and a presentation time extension means 30, for example, a bedridden person (hereinafter referred to as a patient P). It is installed in the lying bed 11.

  The presence / absence determination means 15 is a means for determining the presence / absence of the patient P on the bed 11. In the first embodiment, a load meter 24 is used as a sensor for detecting the bed leaving the patient P in the bed leaving determination means 15. A bed leaving determination unit 15 is configured by the load meter 24, the amplifier 25 connected in analog to the load meter 24 in series, the A / D converter 26, and the bed leaving determination unit 15 a provided in the control device 27. (See FIG. 1). The bed leaving determination unit 15 stores the load amount of the bed 11 in the bed leaving determination unit 15a of the control device 27 in advance. Then, the total load amount of the bed 11 is measured by the load meter 24, and the measured result is compared with the load amount of the bed 11 alone stored in the away floor determination unit 15a. When the difference between the measured result and the load amount of the bed 11 stored in advance exceeds the threshold A, it is determined that the patient P is present on the bed 11, and when the threshold A is not exceeded, the patient leaves the bed. Is determined. In this case, the threshold A is a value set based on the weight of the patient P lying on the bed 11, and is preferably set in the range of 50% to 70% of the weight of the patient P, for example. However, how to set the threshold A is arbitrary and is not limited to this.

  The load cell 24 is interposed between the two legs on the head side of the patient P lying on the bed 11 and the floor among the four legs supporting the bed 11. However, four load cells 24 may be provided between the four legs that support the bed 11 and the floor, or two load meters 24 may be provided between the two legs on the foot side of the patient P and the floor. Good. Furthermore, only one may be provided only between any one leg and the floor.

  The body motion detection means 20 is a means for detecting the body motion of the patient P on the bed 11. The body motion detection unit 20 includes a vibration detection unit 21, a protruding vibration frequency measurement unit 22, and a body motion recognition unit 23.

  The vibration detection means 21 detects vibration that occurs when the patient P moves on the bed 11. Specifically, in the present invention, the vibration detection means 21 shares the load meter 24 used for the bed leaving determination means 15. Then, the load amount measured by the load meter 24 is used as vibration data. This makes it possible to cope with low costs.

  A voltage proportional to the load on the bed 11 is generated from the load meter 24, and the amplifier 25 amplifies the voltage and adjusts the voltage offset in order to efficiently capture data. The adjusted voltage is converted into numerical data as a voltage value via the A / D converter 26, multiplied by a predetermined coefficient, and converted into a load value. This is sequentially processed by the load take-in unit 21a of the control device 27 so that time-series load value data shown in FIG. 4 is taken in.

  The protruding vibration frequency measuring means 22 is a calculation unit and is provided in the control device 27. First, the protrusion vibration frequency measuring means 22 is taken in from the load meter 24 by the vibration detecting means 21, passed through the amplifier 25 and the A / D converter 26, and taken into the load take-in portion 21a, as shown in FIG. In contrast, the high-pass filter (HPF) is passed to remove the load on the bed 11 and the weight corresponding to the weight of the patient P (see data after passing through the high-pass filter in FIG. 4).

  Next, the protrusion vibration frequency measuring means 22 outputs the output value output from the pulsation and breathing of the patient P and the movement of only the hand and the foot, not the body movement, with respect to the load value data after passing through the high pass filter (HPF). Remove. For this purpose, only an output signal that is equal to or higher than a threshold value B, which is a predetermined value set in advance based on the magnitude of a signal output by the heart beat and respiration of the patient P and movements of only the hands and feet, is extracted (FIG. 4). See protruding vibration section of Then, as shown in FIG. 4, the protrusion vibration frequency measuring means 22 measures the number of occurrences of protrusion vibration for each predetermined period from output signals equal to or higher than a threshold value B that can be regarded as load value data due to body movement. . Here, the predetermined period refers to a time during which body movement can be detected accurately and efficiently, and in this embodiment, it is set to 1 minute. One minute is determined by the inventor based on experiments. However, the predetermined period is not limited to 1 minute, and may be 1 minute or less as long as body movement can be detected, or may be a period exceeding 1 minute. Also, the body movement and the load value data generated by the movement of the patient P corresponding to the body movement appear as output values each having a peak, and the number of occurrences of body movement can be determined by measuring the number m of the peaks. It is calculated | required (refer FIG. 4).

  The body movement recognition unit 23 is a calculation unit and is provided in the control device 27. The body movement recognition means 23 recognizes the protrusion vibration as the body movement of the patient P on the bed 11 according to the number of occurrences of vibration per predetermined period measured by the protrusion vibration frequency measurement means 22, that is, the frequency. In this case, according to the number of occurrences, the threshold C is provided, and the value of the threshold C is set to 3 times, for example, and it is assumed that there is body movement when the number of occurrences of vibration within a predetermined period is 3 or more. That is, as described above, the number of occurrences (frequency) of vibrations measured by the protruding vibration frequency measuring means 22 is the number of data each having a peak above the threshold B, and is appropriate data determined as body movement. However, there is a possibility that the measurement error or, for example, vibration caused by hitting the bed 11 only by the arm or leg while the body position of the patient P remains unchanged. Therefore, in consideration of these, the threshold C is provided, and the body movement is recognized only when the number of vibrations equal to or greater than the threshold C is measured. Note that the size of the threshold C may be determined in any way.

  The body motion here does not include the pulsation, breathing, slight movement of the patient P on the bed 11, and vibration due to movement of only the hands and feet, and refers to the body movement equivalent to turning over and turning over. Say. That is, the body movement is a large movement in which a part of the body of the patient P lying on the bed 11 is released from the pressure between the patient 11 and the blood flow is promoted to reduce the risk of pressure sores. Say.

  The risk presentation device 40 includes a body movement counter 31 and a presentation device 32. The body movement counter 31 counts the first predetermined number 1 every time a predetermined period elapses when the body movement recognition means 23 does not recognize body movement in each predetermined period of consecutive predetermined periods. In other words, the body movement recognized by the body movement recognition means 23 is digitized every predetermined period (one minute) instead of directly counting by a timer that the pressure ulcer occurrence risk has increased and the alarm has been issued. The value is subtracted from the count value c of the body movement counter 31, and a predetermined time is determined based on the count value c.

  When the presentation device 32 detects that the count value of the body movement counter 31 has reached the set value, it presents risk information for the occurrence of pressure ulcers. The presentation device 32 includes a display 32a and an alarm 32b.

  The display device 32a is, for example, a display device using a liquid crystal panel, and is connected to the control device 27 and attached to the handrail of the bed 11 so as not to interfere with the patient P when the patient P enters or leaves the floor. Arranged for easy viewing. Information by liquid crystal display is displayed on the display 32a, and any information may be displayed as long as the information is based on the count value c of the body movement counter 31.

  Although not shown, in the present embodiment, three types of information are prepared according to the count value c of the body movement counter 31. That is, the display device 32a has three predetermined thresholds corresponding to the three pieces of information to be displayed, and each display sentence prepared in advance when the count value c of the body movement counter 31 reaches each threshold. Is displayed. For example, when it is determined that there is no body movement by the body movement recognition means 23 and the first predetermined number 1 is sequentially subtracted and the count value c becomes -5, “Still ok” is displayed. “The risk of pressure ulcer development is approaching” is displayed, and “-14 is dangerous” is displayed at −14. The content displayed on the display 32a is not limited to the above content, and any content may be used. For example, instead of displaying a display sentence, lamps color-coded according to the degree of danger may be turned on. Also, four or more threshold values may be provided, or two or less.

  The alarm device 32b is arranged in a nurse station that is a preset report destination and is connected to the control device 27 via a wire or wirelessly. The alarm unit 32b then subtracts 1 which is a first predetermined number from the count value c of the body movement counter 31 to reach a threshold D (for example, -15), and notifies the nurse station by the notification means 41 of the control device 27. An alarm is issued, and the patient P is turned over by the nurse. Note that a caregiver holding the wireless device may be selected as a preset report destination. At that time, when the count value c of the body motion counter 31 reaches a threshold value D (for example, −15), the caregiver is notified via radio, and the patient P is turned over by the caregiver.

  The presentation time extending unit 30 is a unit that lengthens the time until the risk information on the occurrence of pressure ulcer is presented in accordance with the detected degree of body movement (number of occurrences). The presentation time extending unit 30 includes a count value changing unit 34 that adds a second predetermined number to the count value c of the body movement counter 31 after a predetermined period when it is recognized that body movement is recognized every predetermined period.

  The body movement counter 31 is a calculation unit and is provided in the control device 27. The body motion counter 31 adds a second predetermined number to the count value c by the count value changing unit 34 when the body motion recognition unit 23 recognizes the body motion within a predetermined period. The size of the second predetermined number to be added to the count value c is changed and weighted according to the detected degree of body movement (number of occurrences).

  Here, the weighting will be described. For example, when the body movement recognition means 23 recognizes the body movement in the signal detected within a predetermined period, the weighting process is performed by dividing the case as follows. That is, when the number of occurrences of the protrusion vibration measured by the protrusion vibration number measuring means 22 that is the basis for recognizing the body movement is equal to or less than the threshold C + 2, the count value c of the body movement counter 31 is incremented by one. Further, when the number of occurrences of the protruding vibration is equal to or greater than the threshold value C + 3, the count value c of the body movement counter 31 is added by 2. When it is considered that the number of occurrences of vibration is large and the intensity of body movement is strong, the pressure ulcer occurrence risk is considered to be greatly reduced, and the count value c of the body movement counter 31 is added more. Thereby, the time until the count value c of the body motion counter 31 reaches the threshold value D (for example, −15) is extended, and the time until the risk information is presented is appropriately increased according to the degree of body motion of the patient P. can do. Note that the amount of addition to the count value c by weighting is not limited to the above, and may be arbitrarily set.

  In addition, the count value c of the body movement counter 31 to be added or subtracted corresponding to the timing of the risk presentation device 40 is reset when the bed leaving determination unit 15 determines bed leaving of the patient P on the bed 11. The reason for resetting is to eliminate the waste of processing of the control device 27 when the patient P leaves the bed. In addition, once the patient P leaves the bed 11, the blood circulation generally improves, and the risk of occurrence of pressure ulcers. This is because there is no problem even if the measurement is started from the beginning.

  Next, the operation of the pressure ulcer occurrence risk presentation device 10 according to the first embodiment will be described based on the flowcharts 1 and 2 in FIGS. The flowchart 1 is a subroutine program that takes in and stores an output signal (load data) output from the load meter 24 every predetermined period (every minute).

  Flowchart 2 is executed at substantially the same time as Flowchart 1, and is used to derive and present pressure ulcer risk by appropriately acquiring and processing the load data of load meter 24 for each predetermined period acquired in Flowchart 1. It is a program.

  First, it demonstrates based on the flowchart 1 shown in FIG. First, when the pressure sore occurrence risk presentation device 10 is activated, as shown in step S10, a counter n indicating the number of taken-in load data to be taken in every predetermined period is initialized.

  Next, the load value f0 at that time is taken from the load meter 24 and compared with the threshold value A set based on the weight of the patient P by step S11 which is the bed leaving means 15. If the load value f0 is smaller than the threshold value A, it is determined that the patient P is not present on the bed 11, and the process returns to step S10 to initialize the counter n again. And the process of step S10 and step S11 is repeated until the patient P will be in bed on the bed 11 by step S11.

  If the patient P enters the bed 11 or has already entered the bed 11, the load value f0 becomes larger than the threshold value A, and the process moves to step S12. From here, the processing of the load take-in portion 21a is started, and the arithmetic processing following the flowchart 2 is started.

  And between step S12 and step S13 which comprise the load taking-in part 21a, it processes while measuring with a built-in timer repeatedly, and the data for 1 minute are taken in by the load taking-in part 21a, and are memorize | stored in a register | resistor. And if the data for 1 minute are acquired, it will move to step S14.

  In step S14, the built-in timer measured in step S13 is reset, and in step S15, the counter n is incremented by one. In step S16, the data for 1 minute stored in step S12 is acquired and stored as 1 minute data (n) in correspondence with n calculated in step S15. In step S16, a plurality of data (n) for one minute can be stored.

  Then, returning to step S11 again, the presence / absence of the patient P is determined by the presence / absence determination means 15, and if the patient P has left the bed at this stage, the counter n is initialized at step S10. And it repeats between step S10 and step S11 until it becomes a bedded state again. If it is in the presence of a floor, the process proceeds to step S12 and subsequent steps, and the process is the same as the first time until step S14.

  In step S15, the counter n is incremented by 1, and in step S16, the second one-minute data stored in step S12 is acquired and stored as data (n). At this time, n is a value raised by 1 with respect to n stored for the first time, and each data (n) is managed by the value of n. In the above process, the interval between the first storage end time and the second storage start time of the data for one minute stored in step S12 is not large, and is substantially continuous for one minute each time. It may be considered that data has been captured and stored. In this way, the output signal (load value data) from the load cell 24 is continuously taken in every predetermined period and stored.

  Next, the processing of the flowchart 2 shown in FIG. 3 will be described. The flowchart 2 is started substantially simultaneously with the flowchart 1, and the processing proceeds separately. First, in step S20 of the flowchart 2, the count value c of the body movement counter 31 is initialized. Also, the counter n in the flowchart 2 is initialized.

  Next, the load value f0 at that time is taken and compared with the threshold value A in step S21 which is the bed leaving means 15, as in step S11 of the flowchart 1. If the load value f0 is smaller than the threshold value A, the patient P is not present on the bed 11, so the process returns to step S20, and the count value c and the counter n of the body movement counter 31 are initialized. The process is repeated until the patient P is on the bed 11. If the patient P enters the bed 11 and is in a bed, or has already been in bed, the process moves to step S22. In step S22, the process waits for one minute in order to substantially match the time with flowchart 1. In step S23, if the counter n is incremented by one and n is the first time, n = 1.

  Next, in step S24, the 1-minute data (n) stored in step S16 of the flowchart 1 which is proceeding simultaneously with the flowchart 2 is read. At this time, if the first one-minute data (1) is already created and stored in the flowchart 1, it can be read, and the process proceeds to step S26 after passing through step S25. However, if it has not been created yet, the process returns from step S25 to step S24, and the process is repeated until the first one-minute data (1) can be read.

  The next steps S26 to S28 constitute the protruding vibration frequency measuring means 22 constituting the body motion detecting means 20, and first, a process of passing the data (n) read in step S26 through the high-pass filter (HPF) for 1 minute is performed. The

  In step S27, the peak value is compared with the threshold value B in the one-minute data (n) after the high-pass filter (HPF) process. If there is a peak value larger than the threshold value B, the process moves to step S28. If there is no peak value larger than the threshold value B, the process proceeds to step S31.

  The threshold value B is a value for removing data on pulsation and respiration of the patient P other than body motion. Therefore, when there is no peak value larger than the threshold value B and the process proceeds to step S31, there is no body movement, and therefore the count value c of the body movement counter 31 is subtracted by 1 which is the first predetermined number in step S31. In step S32, the risk information on the occurrence of pressure sores is displayed on the display 32a of the presentation device 32. The contents displayed on the display 32a are as described above. That is, when the count value c of the body movement counter 31 reaches three threshold values (not shown), display sentences having contents prepared in advance corresponding to the respective threshold values are displayed.

  In addition, when there is a peak value larger than the threshold value B in step S27 and the process moves from step S27 to step S28, the peak vibration number measuring means 22 of the control device 27 has the peak number m that is the number of peak values. Measure with the measurement function. Then, the process proceeds to step S29, which is the body motion recognition means 23 constituting the body motion detection means 20, and the peak number m of the protruding vibration measured is compared with the threshold value C described above. If the peak number m is smaller than the threshold C, the process proceeds to step S31, and the count value c of the counter is subtracted by 1 which is the first predetermined number, and the process proceeds to step S32.

  If the peak number m is greater than or equal to the threshold value C in step S29, the process proceeds to step S30, which is a count value changing means 34 indicating the operation of the body motion counter 31 constituting the presentation time extending means 30 together with step S29. In step S30, the count value c counted by the body movement counter 31 is calculated by weighting and counted.

  In step S30, the count value c of the body movement counter 31 is incremented by 1 when the peak number m is equal to or less than the threshold C + 2 as described above. When the peak number m is equal to or greater than the threshold value C + 3, the count value c of the body movement counter 31 is incremented by 2. Thus, since the count value c of the body movement counter 31 is weighted according to the magnitude of the peak number m measured in step S28, risk information on the occurrence of pressure ulcer is presented according to the state of body movement of the patient P. It is possible to appropriately lengthen the time until. Note that the amount of addition of the count value c by weighting is not limited to the above, and may be arbitrarily set. Then, the process proceeds to step S32, and the contents set in advance on the display device 32a of the presentation device 32 are respectively displayed according to three threshold values (not shown) as described above.

  Steps S <b> 32 to S <b> 34 constitute the risk presentation device 40 together with the body movement counter 31. In step S33, it is detected that the counter value c of the body movement counter 31 has reached a threshold value D that is a set value. The threshold D is a threshold for the count value c for issuing an alarm, and may be set arbitrarily. In this embodiment, for example, the threshold value D is −15, and when the count value c becomes −15 or less, an alarm is issued by the alarm device 32b of the presentation device 32 in step S34 as the notification means 41, and pressure ulcer occurs in the nurse or the caregiver. Report risk information.

  If the count value c does not reach the threshold value D in step S33, the process moves to step S21, which is the bed leaving determination means 15, and checks the bed leaving the patient P again. The count value c of 31 and the counter n are reset. If the user is present, the process proceeds to step S22, and the same processing as the first time is continued until an alarm is issued in step S34. In the flowchart 2 described above, the risk presentation device 40 is configured by steps S24 to S27 and steps S31 to S34.

  As is clear from the above description, the pressure ulcer occurrence risk presentation device 10 according to the first embodiment detects the body motion of the patient P on the bed 11 by the body motion detection means 20. The time until the next body movement is detected is counted by the count value c of the counter 31. When the time, that is, the count value c reaches a predetermined threshold, information on the risk of pressure ulcer occurrence is displayed by the presentation device 32 of the risk presentation device 40. It is presented by a certain display device 32a or alarm device 32b. At this time, the count value c is added by the count value changing unit 34 of the presentation time extending unit 30 according to the degree of body movement of the patient P. As a result, the time until pressure ulcer occurrence risk information is presented by the alarm device 32b becomes longer. In this way, the count value c of the body motion counter 31 is added according to the degree of body motion measured every predetermined period, and the time until risk information is presented is determined based on the count value c. Risk information corresponding to the state of body movement of the upper patient P can be provided at an appropriate timing. As a result, the caregiver can be called only when turning over is really necessary, so that the burden on the nurse, the caregiver, and the person on the bed can be greatly reduced.

  Moreover, since the vibration detection means 21 is comprised by the load meter 24, it can select from abundant commercial items and can respond | correspond at low cost.

  Further, paying attention to the number of protrusion vibrations measured by the protrusion vibration number measuring means 22 which is a basis for determining body movement, the count value c of the body movement counter 31 is determined by weighting according to the number of protrusion vibrations. Thereby, the state of the body movement of the patient P on the bed 11 can be accurately grasped, and the time until the risk information is presented can be accurately lengthened by an appropriate length according to the body movement state.

  Moreover, it has the presence-and-absence determination means 15 of the patient P on the bed 11, and when the patient P on the bed 11 leaves the bed 11, the count value c of the body movement counter 31 corresponding to the timing of the risk presentation device 32 is obtained. Reset. As a result, no computation is performed during getting out of bed and there is no waste.

  Further, since the presence / absence bed determination unit 15 performs the determination of the presence / absence bed based on the load amount detected by the load meter 24, it can be shared with the load meter used for the vibration detection unit 21 for detecting the vibration on the bed 11 and is efficient.

  Further, when the count value c of the body movement counter 31 reaches a predetermined threshold D, the reporting means 41 reports to a preset reporting destination such as a nurse station or a caregiver, so that the risk of pressure ulcer occurrence can be ensured. You can contact the administrator.

  Next, a pressure ulcer occurrence risk presentation device 20 according to the second embodiment will be described. The pressure ulcer occurrence risk presentation device 20 of the second embodiment differs from the pressure ulcer occurrence risk presentation device 10 of the first embodiment only in the weighting method of body movement determination. In the first embodiment, the body motion counter 31 weights and changes the count value according to the number of vibrations measured by the protruding vibration frequency measuring means 22. However, in the second embodiment, when the state where the body movement recognition means 23 recognizes the body movement every predetermined period appears continuously, or when the state where the body movement recognition means 23 does not recognize every predetermined period appears continuously. The count value c is changed by weighting according to the number of consecutive times that the dynamic counter 31 has appeared or the number of times that the dynamic counter 31 has not appeared. Therefore, only the operation that is the changed point will be described, and description of similar parts will be omitted. Moreover, the same code | symbol is attached | subjected and demonstrated to the same structure.

  The operation of the pressure ulcer occurrence risk presentation device 20 according to the second embodiment will be described based on the flowcharts 1 and 3 of FIGS. However, since the flowchart 1 is the same as that of the first embodiment, a description thereof will be omitted except for necessary portions.

  The process of the flowchart 3 will be described. The flowchart 3 is started substantially simultaneously with the flowchart 1, and the processing proceeds separately. First, in step S40 of the flowchart 3, the count value c and the counter n of the body movement counter 31 are initialized. At the same time, a count value a of the number of consecutive body movement occurrences and a count value b of the number of times body movements have not continuously occurred are initialized.

  Next, the load value f0 at that time is taken in and compared with the threshold value A in step S41 which is the bed leaving means 15, as in step S11 of the flowchart 1. If the load value f0 is smaller than the threshold value A, there is no patient P on the bed 11, so the process returns to step S40, and the count value c, the counter n, the count value a of the number of consecutive body motion occurrences, and the body motion are continuous. The count value b of the number of times that has not occurred is initialized. The process is repeated until the patient P is on the bed 11. When the patient P enters the bed 11 and is in a bed, or has already been in bed, the process moves to step S42.

  Steps S42 to S45 have the same contents as Steps S22 to S25 in the flowchart 2, and thus the description thereof is omitted.

  The next steps S46 to S48 constitute the protruding vibration frequency measuring means 22 in the body motion detecting means 20, and the process of passing the 1-minute data (n) obtained in step S46 through the high-pass filter (HPF) is performed.

  In step S47, the peak value is compared with the threshold value B in the one-minute data (n) after the high-pass filter (HPF) processing, and if there is a peak value larger than the threshold value B, the process moves to step S48 and is larger than the threshold value B. If there is no peak value, the process proceeds to step S52.

  In step S52, 1 is added to the count value b of the number of times that body motion has not occurred continuously, and the count value a of the number of times of continuous body motion occurrence is reset to 0. In step S53, weighting is performed according to the number of times that body movement has not occurred continuously. Specifically, when the count value b is b ≦ 2, 1 is subtracted from the count value c of the body movement counter. When the count value b is 3 ≦ b ≦ 5, 2 is subtracted from the count value c. Further, when the count value b is b ≧ 6, 3 is subtracted from the count value c. Thus, since the count value c of the body motion counter is weighted according to the number of times body motion does not occur continuously, the time until the alarm is issued according to the state of the patient P whose risk of pressure ulcers has increased. Can be shortened appropriately. Then, the process proceeds to step S54.

  Further, when there is a peak value larger than the threshold value B in step S47 and the process moves to step S48, the peak number m, which is the number of peak values, is measured. Then, the process proceeds to step S49, which is the body motion recognition means 23, and the measured peak number m is compared with the threshold value C. If the peak number m is smaller than the threshold value C, the process proceeds to steps S52 and S53 and the same processing as described above is performed. If the peak number m is larger than the threshold value C, the process proceeds to step S50.

  In step S50, 1 is added to the count value a of the number of consecutive body movement occurrences, and the count value b of the number of times body movements have not occurred continuously is reset to 0. In step S51, which is the counter value changing means 34 of the presentation time extending means 30, weighting is performed according to the number of consecutive occurrences of body movement. Specifically, 1 is added to the count value c of the body movement counter when the count value a of the number of consecutive occurrences is a ≦ 2. When the count value a is 3 ≦ a ≦ 5, 2 is added to the count value c. Further, when the count value a is a ≧ 6, 3 is added to the count value c. In this way, the count value c of the body motion counter is weighted according to the number of times that body motion has occurred continuously, so that it is possible to appropriately lengthen the time until the alarm is issued according to the state of body motion of the patient P. it can. In the second embodiment, the addition amount or subtraction amount of the count value c by weighting is not limited to the above, and may be arbitrarily set. And it progresses to step S54 and displays the preset content on the display 32a of the presentation apparatus 32 as mentioned above.

  Steps S54 to S56 constitute the risk presentation device 40 together with the body movement counter 31. In step S55, it is detected that the counter value c of the body movement counter 31 has reached the threshold value D, which is a set value, and the count value c and the threshold value D are compared. The threshold value D is a threshold value for the count value c for the alarm device 32b to issue an alarm, and may be set arbitrarily. In the present embodiment, for example, the threshold value D is −15, and when the count value c becomes −15 or less, an alarm is issued in step S56 which is a reporting means, and a nurse or caregiver is notified.

  If the count value c does not reach the threshold value D, the process moves to step S41, which is the bed leaving determination unit 15. Then, the presence / absence of the patient P is confirmed, and if the person is getting out of bed, the count value c of the body motion counter 31, the count value a of the number of consecutive body motions, and the count value of the number of times body motions have not continuously occurred in step S40 If b and the counter n are reset and the user is present, the process proceeds to step S42, and the same process as the first time is continued until an alarm is issued in step S56. In the flowchart 3, the risk presentation device 40 is configured by steps S44 to S47 and steps S52 to S56. Further, the presentation time extending means 30 is configured by steps S49 to S51.

  In the second embodiment, the case where the body motion recognized by the body motion recognition unit 23 every predetermined period appears as the weighting method of the count value c. However, the present invention is not limited to this, and when a body motion appears every other period of time or every other period, a corresponding weight may be given. This also provides the same effects as described above.

  As is clear from the above description, the pressure ulcer occurrence risk presentation device 20 according to the second embodiment can obtain the same effects as those of the first embodiment.

  Further, in the second embodiment, the count value c of the body motion counter 31 is determined when the body motion recognized by the body motion recognition unit 23 appears every predetermined period or when it does not appear continuously. The weighting is performed on the basis of the number of consecutive times of appearing or the number of consecutive times of not appearing. In other words, if the patient P appears continuously, the patient P on the bed often moves and the risk of pressure ulcers is considered to decrease. Therefore, the risk of pressure ulcers decreases according to the number of times the body movement counter appears continuously. Weight in the direction to be. In addition, when body movement does not appear continuously, the risk of pressure ulcers may increase remarkably every time depending on the symptoms of the patient P, so the count value c of the body movement counter 31 is also continuous. Thus, weighting is given to the direction in which the risk of developing pressure ulcers increases according to the number of times it does not appear. As a result, the state of body movement of the patient P on the bed 11 can be accurately grasped, and the time until risk information is presented can be accurately changed by an appropriate length according to the body movement state.

  In the first and second embodiments, the count value c of the body movement counter 31 is determined by different weighting methods. However, two different weighting methods may be applied simultaneously. As a result, it is possible to provide a more accurate pressure ulcer warning device.

  In the first and second embodiments, a numerical value is added to the count value c of the counter 31 when body movement is recognized, and a numerical value is calculated from the count value c when body movement is not recognized. Subtracted. However, the present invention is not limited to this, and when body movement is recognized, a numerical value may be subtracted from the count value c of the counter 31, and when body movement is not recognized, a numerical value may be added to the count value c. For example, the threshold value D is set to 15, and when the count value c reaches 15, the alarm unit 32b may be notified by the notification means 41.

  Moreover, in 1st and 2nd embodiment, although the alarm device 32b was provided as what comprises the presentation apparatus 32, it may not be the alarm device 32b. For example, the danger screen may be displayed on the monitor screen of the PC of the nurse station, or a message that is recorded in advance and informed of the danger may be reported by telephone.

  In the first and second embodiments, the time until the risk information on the occurrence of pressure ulcer is presented is counted by the count value c of the counter 31. However, the present invention is not limited to this, and the time may be directly measured by a timer. When body motion is recognized by the body motion recognition means 23, the threshold value D can be appropriately changed by subtracting or adding time to the threshold value D indicating the time until pressure information on the occurrence of pressure ulcer is presented. That's fine. By this, the same effect as this embodiment can be expected.

  In the first and second embodiments, the vibration detector 21 uses the load meter 24, but the present invention is not limited to this, and an accelerometer may be used. By arranging the accelerometer at a predetermined position on the bed, detecting the movement of the patient P as an acceleration, and detecting the body movement according to the magnitude of the acceleration, the same effect as the present embodiment can be obtained at a low cost.

  Further, the vibration detecting means 21 may be a piezoelectric film using a piezoelectric effect. The piezoelectric film includes a sheet-like piezoelectric body and first and second electrode surfaces formed on both upper and lower surfaces thereof. Electric charges are generated according to the strain displacement of the piezoelectric body caused by the application of external force (load) to the first electrode surface and the second electrode surface, so that current can be taken out between the first electrode surface and the second electrode surface. . That is, the first electrode surface and the second electrode surface are also pressure sensing surfaces, and the movement of the patient P is output as a current between the first electrode surface and the second electrode surface by spreading the piezoelectric film on the bed. The body movement may be detected from the output data. Accordingly, it is possible to accurately detect the movement of a person on the bed over the entire surface of the bed, and to provide a pressure ulcer occurrence risk presentation device with higher accuracy.

  Further, the vibration detecting means 21 may be a sensor utilizing deformation of a strain resistor, a load cell, or a coil spring (spring).

10, 20 ... Pressure ulcer occurrence risk presentation device, 11 ... Bed, 15 ... Staying away bed determination means, 20 ... Body motion detection means, 21 ... Vibration detection means, 21a ... Load loading , 22... Projection vibration count measuring means, 23... Body motion recognition means, 24... Load meter, 25... Amplifier, 26. 30 ... presentation time extension means, 31 ... body movement counter, 32 ... presentation device, 34 ... count value changing means, 40 ... risk presentation device, 41 ... notification means.

Claims (10)

Body motion detection means for detecting the body motion of a person on the bed;
A risk presentation device that starts timing when detecting body movement and presents risk information for the occurrence of pressure ulcers when it detects that a predetermined time has passed before detecting the next body movement;
A presentation time extending means for lengthening the time until the risk information on the occurrence of pressure ulcer is presented according to the detected degree of body movement;
A pressure ulcer occurrence risk presentation device comprising: In Claim 1, the said body movement detection means is
Vibration detecting means for detecting vibration on the bed;
A protrusion vibration number measuring means for measuring the number of occurrences of a protrusion vibration having a magnitude greater than or equal to a predetermined value among vibrations detected in a predetermined period by the vibration detection means;
Body movement recognition means for recognizing human body movement on the bed based on the number of occurrences of the protruding vibration,
The risk presentation device includes:
A body motion counter that counts and counts a first predetermined number every time the predetermined period has elapsed unless the body motion recognition means recognizes body motion in each predetermined period of the predetermined period;
A presentation device that presents risk information for the occurrence of pressure ulcers when it is detected that the count value of the body movement counter has reached a set value,
The presentation time extending means is
A pressure ulcer occurrence risk presentation device comprising: a count value changing means for adding or subtracting a second predetermined number of the count value of the body movement counter when the body movement is recognized during the predetermined period. In Claim 2, the vibration detection means is a load cell,
The pressure ulcer occurrence risk presentation device, wherein the protrusion vibration frequency measuring means measures the number of occurrences of the protrusion vibration having a magnitude equal to or greater than a predetermined value based on a load amount detected by the load meter.   4. The pressure ulcer occurrence risk presentation device according to claim 2, wherein the count value of the body movement counter is weighted according to the number of occurrences of the protruding vibration measured by the protruding vibration number measuring means. . In any one of Claims 2 thru | or 4,
The count value of the body movement counter appears when the state recognized and detected by the body movement recognition means as body movement every predetermined period appears continuously or when it does not appear continuously. A pressure ulcer occurrence risk presentation device characterized in that weighting is performed according to the number of consecutive times or the number of consecutive times that did not appear. In any one of Claims 1 thru | or 5, It has a bed leaving determination means which determines the bed leaving of the person on the bed,
The pressure ulcer occurrence risk presenting apparatus, wherein when the presence / absence determination means determines that a person is getting out of bed, the timing of the risk presentation apparatus is reset.   7. The pressure ulcer occurrence risk presenting device according to claim 6, wherein the presence / absence bed determination means performs the determination of a person's presence / absence bed on the bed based on a load amount detected by the load meter.   8. The reporting means according to claim 2, wherein the risk presentation device includes a reporting unit configured to report to a preset reporting destination when it detects that the count value of the body movement counter has reached a predetermined threshold value. A pressure ulcer occurrence risk presentation device characterized by comprising:   3. The pressure ulcer occurrence risk presenting device according to claim 2, wherein the vibration detecting means is an accelerometer arranged so as to be able to measure a motion acceleration of a person on the bed.   3. The pressure ulcer occurrence risk presenting device according to claim 2, wherein the vibration detecting means is a piezoelectric film arranged so as to be able to measure a person's movement on the bed.

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