JP6491121B2 - Body strain detection system - Google Patents

Description

  The present invention relates to a body strain detection system that detects posture distortion by collecting data of posture of a user over a long period of time.

  Physical distortions caused by lifestyle habits and habits of standing behavior cause various problems such as stiff shoulders, back pain, swelling, and headaches. Therefore, the body can be kept in good condition by detecting the part and cause of the body distortion and correcting the body posture to correct the distortion.

  Therefore, in order to detect body distortion, the posture of the user is evaluated based on the inclination of the holding portion held by the user with both hands and the position of the center of gravity of the load acting on the platform on which the user rides with both feet. A posture evaluation apparatus that outputs an evaluation result is known (see Patent Document 1).

  In addition, the left and right arm postures are determined from the data obtained by measuring the three-dimensional posture with the first sensor and the second sensor attached to the left and right upper arms of the body, and according to the difference in the posture of the left and right arms. A detection system that detects a strain by determining a strong portion of the upper body muscle is also known (see Patent Document 2).

JP 2009-219622 A JP 2010-207399 A

  However, the apparatus disclosed in Patent Document 1 uses measurement results when a predetermined operation is performed using a special measuring instrument having a holding part and a base part to detect body distortion. It does not measure body strain from the daily movements of the subject.

  In addition, the device disclosed in Patent Document 2 detects distortion by detecting a strong part of the muscle according to the difference in posture of the left and right arms, but there is a difference in the muscle strength of the left and right arms, In general, the dominant hand is stronger. Therefore, the distortion cannot always be accurately detected from the difference between the left and right muscle strengths.

  In order to solve the above problems, the present invention does not use a special measuring instrument, and the body distortion from the posture of natural standing behavior in daily behavior including the work posture at the work of the examinee. The purpose is to provide a body strain detection system for detection.

In order to solve the above-described problem, a body strain detection system according to the present invention detects posture of a person to be measured and detects posture inclination to determine posture distortion. The posture detection device is attached to a binocular loupe attached to the head of the person to be measured, and has acceleration or angular velocity in three orthogonal directions orthogonal to each other. An acceleration sensor or an angular velocity sensor to be detected, and a position of a neck serving as a fulcrum when the head is tilted as an origin, and the measurement subject passing through the origin The position of the head on the Y-axis in the space of the orthogonal three-dimensional coordinate axis XYZ when taking a posture to visually observe the horizontal X-axis direction is set as a reference position, and then the acceleration sensor Or from the angular velocity sensor Another three-dimensional coordinate axis X ′ including the Y ′ axis passing through the position of the head and the origin obtained immediately before the coordinates of each position of the head obtained from the acceleration or the angular velocity obtained in the meantime In Y′Z ′, the head has moved from the position of the head obtained immediately before by the movement distance in the three-axis direction of the acceleration sensor or angular velocity sensor calculated from the acceleration or angular velocity acquired at that time. An arithmetic processing unit that calculates the coordinate of the head on the other three-dimensional coordinate axis X′Y′Z ′ and converts the coordinate on the three-dimensional coordinate axis XYZ to determine the tilt angle of the head ; A memory for storing the coordinates of the head and the tilt angle of the head obtained by the arithmetic processing unit, and the strain determination device reads the coordinates of the head read from the memory and / or the Head The distortion of the body is determined based on an inclination angle.

  And the said distortion determination apparatus reads the said coordinate from the said memory by USB connection with the said attitude | position detection apparatus, It is characterized by the above-mentioned. Therefore, when the posture detection device is connected to the distortion determination device via USB, the arithmetic processing unit receives power from the distortion determination device by the bus power function and stores it in the memory from the distortion determination device by the mass storage function. Accept data reference.

  The memory may be constituted by a card-type flash memory that can be detached from the posture detection device and connected to the strain determination device.

  And the said arithmetic processing part and the said memory may be packaged with the said acceleration sensor, and may be mounted | worn with the said site | part.

  The acceleration sensor is worn by being attached to the head of the subject or a binocular loupe worn by the subject.

  According to the present invention, in order for the measurement subject to detect the movement of the body by wearing the acceleration sensor, the measurement subject can measure the distortion in order to measure the daily posture without taking any special posture or motion. It can be determined accurately.

1 is a block diagram showing a schematic configuration of a body strain detection system according to an embodiment of the present invention. The figure explaining the ideal attitude | position which does not cause the distortion of the body when a dentist performs treatment to a patient is shown. The flowchart explaining the process sequence of the attitude | position detection apparatus of the body strain detection system which concerns on embodiment of this invention is shown. FIG. 3 is an explanatory diagram illustrating three-dimensional coordinates of a measurement site that accompanies the measurement subject's movement. The coordinate of FIG. 3 is an explanatory diagram in two dimensions of XY. The conceptual explanatory drawing of the memory storage format is shown. The schematic explanatory drawing of the screen which displays the distortion determination result by the distortion determination apparatus of the body distortion detection system which concerns on embodiment of this invention is shown. The schematic explanatory drawing of the screen which displays the distortion determination result by the distortion determination apparatus of the body distortion detection system which concerns on embodiment of this invention in time series is shown. The explanatory view of the composition which attached the acceleration sensor to the binocular loupe is shown.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 is a block diagram showing a schematic configuration of a body strain detection system 1 according to the present embodiment. As shown in FIG. 1, the body strain detection system 1 includes an attitude detection device 2 that is attached to a user's body and measures a change in the posture of the user over a long period of time, and an information processing device 3. The The information processing apparatus 3 functions as a distortion determination apparatus by executing a distortion determination program, and determines the distortion of the user's body by performing calculation processing of measurement data from the posture detection apparatus 2.

  The attitude detection device 2 includes a triaxial acceleration sensor 4, an arithmetic processing unit 5, a memory 6, a power supply unit 7, and a switch 11.

  When the posture detection device 2 is attached to a part for detecting the movement of the body of the person to be measured, the three-axis acceleration sensor 4 has three axes (X axis, Y axis, Z axis) orthogonal to the position information of the part. It is a position detection sensor that detects and outputs the acceleration in each direction. Thus, in this example, the triaxial acceleration sensor 4 is used as the position detection sensor, but an angular velocity sensor may be used.

  The arithmetic processing unit 5 includes a control board including a microcomputer 8, a real time clock circuit (RTC) 9, and a USB (Universal Serial Bus) port 10. When the microcomputer 8 acquires the X-axis, Y-axis, and Z-axis accelerations from the acceleration sensor 4, the microcomputer 8 calculates the three-axis movement distances by time-integrating each acceleration, and the space at that time Identify the location.

  The microcomputer 8 uses the initial positions of the acceleration sensor 4 on the X-axis, Y-axis, and Z-axis as the origin, and calculates the three-axis movement distances x, y, and z from this origin, so that the space at that time Find the coordinates at. The microcomputer 8 stores the obtained space coordinates in the memory 6 in association with the time information output by the RTC 9 at that time. In this case, the arithmetic processing unit 5 outputs, for example, space coordinates and time information to the memory 6 every second.

  The memory 6 is a type of memory in which data can be freely erased and written, and the contents do not disappear even when the power is turned off, and a flash memory is preferable. When the posture detection device 2 is worn by the user for a maximum of 24 hours and is configured to detect a change in posture during that time, the memory 6 is sent from the arithmetic processing unit 5 86, 400 ( Storage capacity sufficient to store (second) coordinates and time information.

  The USB port 10 connects the posture detection system 1 to the information processing apparatus 3 via USB. The arithmetic processing unit 5 is supplied with power from the information processing device 3 by the bus power function when the posture detection device 2 is connected to the information processing device 3 by USB, and is also stored in the memory 6 from the information processing device 3 by the mass storage function. Accept references to stored data. The memory 6 may be a card-type flash memory that can be detached from the attitude detection device 2 and connected to the information processing device 3.

  The power supply unit 7 includes a power supply control unit 12, a battery 13, and a voltage monitoring unit 14. The power supply control unit 12 supplies the power of the battery 13 to the arithmetic processing unit 5 and controls the battery 13 to be charged with bus power when the body strain detection system 1 is connected to the information processing device 3 by USB. The voltage monitoring unit 14 monitors the voltage of the battery 13 and turns on an indicator to display a warning when the voltage drops to a predetermined level.

  As will be apparent later, the switch 11 is operated when setting the reference position.

  The correct posture is maintained by the physical strength of the body, but it is apt to have a comfortable posture in daily activities, especially when working. However, an easy posture is a posture in which the muscle strength is defeated by gravity, and if the correct posture cannot be maintained for a long time, it causes the body to be distorted.

  As an example of a correct posture during work, the posture when a dentist performs treatment on a patient will be described. As shown in FIG. 2, the inclination of the head with the neck as a fulcrum with respect to the vertical center axis of the body is in the range of 0 to 20 degrees forward, and the elbows of both arms with the shoulder as a fulcrum An angle in the range of 0 to 25 degrees forward is appropriate. In this case, when the head is at most 25 degrees or more, the center axis of the body is bent and becomes stooped, which may cause body distortion.

  In this case, the lifting angle of the forearm from the horizontal direction is preferably in the range of 0 to 10 degrees, and the angle of the axis of the upper leg with respect to the central axis of the body is preferably in the range of 105 to 125 degrees. Then, if the posture in which the left / right balance of the body is lost, for example, the state in which the neck is tilted to one of the left and right is continued for a long time, the burden on the cervical spine is caused.

  The strain detection system 1 according to the present invention can be used to measure the forward tilt angle and the left / right tilt of the doctor's head during the treatment by such a doctor. In this example, as shown in FIG. 9, the acceleration sensor 4 is attached to a frame 16 of a binocular loupe 15 worn by a doctor. The binocular loupe 15 is widely used as means for enlarging and visually observing a local visual object at hand (treatment site) with the binocular loupe main body 17.

  And the arithmetic processing part 5, the memory 6, the power supply part 7, and the switch 11 are stored in a case as a control unit, and are mounted | worn and hold | maintained at a worker's body. The operation part of the switch 11 is provided on the surface of the case. Thus, in this example, the acceleration sensor 4 is separated from the posture detection device 2 and attached to the binocular loupe 15. However, the posture detection device 2 that is sufficiently miniaturized can be realized without separation. In such a posture detection device 2, it may be worn by a doctor by wearing it on a headband or a medical hat. Of course, even in this case, the posture detection device 2 may be configured such that only the acceleration sensor 4 is attached to the headband or the medical hat.

  A method for measuring the inclination of the head when a doctor performs treatment will be described. FIG. 3 shows a flow for measuring the inclination of the head.

First, the person to be measured (doctor) corrects the posture so that the center line of the head and the back is on the same vertical line with the binocular loupe 15 on the face, and the posture to visually observe the horizontal direction. take. When the switch 11 is operated in this state, the microcomputer 8 sets a reference position (step S1).

  FIG. 4 shows the position of the head in three-dimensional coordinates. The origin O of the space is the position of the neck as a fulcrum when the head is tilted back and forth and left and right, and the point P is the vertical direction in which the posture is the Y-axis direction. This is the center position of the head of the person to be measured when the line of sight is directed in the horizontal direction, which is the X-axis direction. Thereafter, the coordinates (x, y, z) of the point P serve as a reference position for detecting a displacement when the measurement subject moves the head with the neck as a fulcrum.

  After setting the reference position, the microcomputer 8 acquires each acceleration in the three axes from the acceleration sensor 4 (step S2), integrates the acquired acceleration with time, and moves the acceleration sensor 4 in the three-axis direction. Is calculated (step S3).

  Next, the microcomputer 8 obtains coordinates based on the calculated movement distance (step S4). When the coordinates are obtained, the forward tilt angle of the acceleration sensor 4 is calculated, and the tilt angle and the coordinates are stored in the memory 6 with the time information output by the RTC 9 at that time (step S5).

Then, the microcomputer 8 determines whether or not the measurement subject's treatment has been completed (step S6). When the treatment of the subject is finished, the switch 11 is operated again. Therefore, the microcomputer 8 performs the processing from step S2 to step S5 while the switch 11 is not operated again (" NO " in step S6). At this time, the microcomputer 8 acquires the acceleration from the acceleration sensor 4 at step S2 every second and repeats the processing up to step S5.

  Therefore, after the reference position is set, when the measurement subject moves the line-of-sight direction from the horizontal direction to the affected part located below in order to start treatment, the microcomputer 8 uses the acceleration acquired from the acceleration sensor 4 as time. And the coordinates (x1, y1, z1) of the point Q where the head is located are calculated by calculating the movement distances in the three-axis directions from the point P. Therefore, the tilt angle θ1 of the head is calculated from the numerical values of x1 and y1.

Further, when the person to be measured moves the head from the position of the point Q to the position of the point R, the movement distance on the three axes calculated by time integration of the acceleration acquired from the acceleration sensor 4 at this time is the point Q. Therefore, the microcomputer 8 determines the coordinates (x2, y2, z2) of the point R in terms of the movement distance from the reference position P.

  This conversion will be described. In this case, the movement from the point P to the point R of the head by the measurement subject is assumed to be only forward (X-axis direction) and not to the left and right (Z-axis direction), and will be described with the two-dimensional coordinates in FIG. . At this time, if the line connecting the point O and the point Q is the Y ′ axis, and the line passing through the point Q and orthogonal to the Y ′ axis is the X ′ axis, the distance p from the point Q to the point R is the distance p in the X ′ axis direction. , The distance q is moved in the Y′-axis direction. Therefore, the angle a is arctan (x1 / y1), the angle b is arctan (q / p), and the angle α forming a right angle between the angle a and the angle b is obtained. Then, the coordinates of the point R (x1 + r × sin α, y1−r × cos α) are calculated from the angle α and the distance r between the point P and the point R obtained by numerical values of p and q, and the position of the head is determined. The forward tilt angle θ2 when it is at the point R is detected.

  Even when the head is tilted in the left-right direction, the coordinates can be obtained from the movement distance of the acceleration sensor 4 in the Z-axis direction. Then, the tilt angle of the head in the left-right direction is detected from the values of the Y-axis and Z-axis of the obtained coordinates.

  In this way, after setting the reference position P, the arithmetic processing unit 5 calculates the movement distance in the three-axis direction by integrating the acceleration acquired from the acceleration sensor 4 with respect to time every second, and at least one of them is calculated. If there is a movement distance on one axis, the coordinates of the moved position are calculated based on the movement distance. At this time, when there is no movement on any of the X, Y, and Z axes, the arithmetic processing unit 5 continuously outputs the most recently detected coordinates.

  The microcomputer 8 stores the coordinates detected every second and the forward tilt angle of the head calculated from these coordinates in correspondence with the time information in the RTC 6 at that time. FIG. 6 conceptually shows the storage format of the memory 6, and the coordinates of the head, the forward tilt angle, and the right or left tilt angle every second are measured throughout the time when the measurement subject performs the treatment. It is memorized in time series.

  In the distortion detection system 1, when the USB port 10 is connected to the information processing device 3 by USB, the arithmetic processing unit 5 responds to an instruction from the information processing device 3 and the measurement data and time stored in the memory 6. Read and send information.

  The information processing device 3 determines the posture distortion during the treatment of the measurement subject from the measurement data read from the memory 6 and displays the result on the monitor screen in various graphs.

  For example, as shown in FIG. 7, a three-dimensional coordinate axis is displayed on the monitor screen, and each coordinate of the head is plotted and displayed throughout the treatment time. In this case, coordinates that fall within the appropriate range of 0 ° to 20 ° are determined to be normal and displayed as green dots, and coordinates in the range of 20 ° to less than 25 ° are determined to be sensitive and yellow “Δ ", And coordinates of 25 degrees or more are determined to be distortion and displayed with red" x "marks.

  Then, the ratio of coordinates belonging to the normal, cautionary, and distortion ranges is displayed in the illustrated pie chart or bar graph, and the distortion when the subject tilts the head forward during the treatment according to the ratio. Determine the degree. In some cases, the degree of distortion is determined so that the person to be measured takes a stooped posture with the face close to the affected part in order to accurately observe the affected part. For example, if the coordinates that fall within the normal range are 80% or more, it is normal. It is determined that the posture. Then, the ratio of the time during which the head is tilted left and right throughout the treatment time is displayed in the illustrated pie chart or bar graph.

  FIG. 8 shows an example in which changes in the forward tilt angle of the neck are displayed in time series throughout the treatment. In this case, after the reference position is set, the person to be measured first tilts his neck forward at time t1, indicating that the forward tilt angle increases with time and the posture is distorted. Yes.

  As described above, the case where the strain of the body is detected by the tilt posture of the head during work has been described. However, not only the head but also other body parts can be detected. For example, in the posture at the time of treatment of the doctor shown in FIG. 2, a wearing belt with the acceleration sensor 4 attached is wrapped around the thigh, upper arm, or arm, and the coordinates of the body part where the acceleration sensor 4 is attached are detected from the acceleration information. can do.

  Then, the information processing device 3 has an appropriate angle corresponding to the body part to which the acceleration sensor 4 is attached, that is, the thigh is 105 degrees to 125 degrees with respect to the vertical center axis of the body. The range angle is set to normal. Therefore, the information processing apparatus 3 displays a three-dimensional coordinate axis on the monitor screen, plots and displays the coordinates of the thigh per second throughout the treatment time, and ranges from 105 degrees to 125 degrees in the proper range. Coordinates that fall within the range are displayed as green dots, and coordinates that fall outside this range are displayed as red “x” marks.

  The posture detection device 2 may include a biometric sensor that detects the heart rate, respiration rate, or epidermis temperature of the measurement subject together with the acceleration sensor 4. In this case, the posture detection device 2 stores the biological information detected by the biological sensor together with the time information of the RTC 9 in the memory 6 so that the information processing device 3 associates the biological information read from the memory 6 with the distortion. All the judgments can be made.

  The present invention relates to a body strain detection system that determines body strain from daily activities, and has industrial applicability.

1 body strain detection system 2 posture detection device 3 computer (strain determination device)
4 Acceleration sensor (position detection sensor)
5 Arithmetic processing unit 6 Memory

Claims (4)

A body strain detection system including a posture detection device attached to the body of the measurement subject and a strain determination device to detect posture distortion by detecting the inclination of the head of the measurement subject,
The posture detection device is
An acceleration sensor or an angular velocity sensor which is attached to a binocular loupe attached to the head of the measurement subject and detects acceleration or angular velocity in three orthogonal directions;
And the origin position of the neck as a fulcrum when tilting the head, the measured person through the raw point the head and the center line of the back in the vertical position in a horizontal X-axis to Y-axis The position of the head on the Y axis in the space of the orthogonal three-dimensional coordinate axis XYZ when taking the posture for visually observing the direction is set as a reference position, and thereafter periodically from the acceleration sensor or angular velocity sensor the coordinates of each position of the head determined from the acceleration or angular velocity to acquire, another three-dimensional coordinate axes X'Y' comprising Y'-axis passing through said the position of the head determined just before the origin In Z ′, it is assumed that the head has moved from the position of the head obtained immediately before by the movement distance in the three-axis direction of the acceleration sensor or angular velocity sensor calculated from the acceleration or angular velocity acquired at that time. calculated, said another third-order An arithmetic processing unit that the head coordinates in the coordinate axis X'Y'Z', determines the inclination angle of the head in terms of coordinates in the three-dimensional coordinate axes XYZ,
A memory for storing the coordinates of the head and the tilt angle of the head obtained by the arithmetic processing unit;
The body strain detection system, wherein the strain determination device determines the body strain based on the coordinates of the head and / or the tilt angle of the head read from the memory.   2. The body strain according to claim 1, wherein the memory stores the coordinates of the head and the tilt angle of the head in association with time information when the coordinates of the head are obtained. Detection system. 3. The body strain detection system according to claim 1, wherein the arithmetic processing unit and the memory are packaged in one unit and attached to the body of the subject. The posture detecting apparatus includes a biological sensor that detects at least one of a heart rate, a respiratory rate, and an epidermis temperature, and acquires biological information based on a detection output from the biological sensor. 4. The body strain detection system according to any one of 3 .

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