JP6097905B2 - Rising motion measurement system - Google Patents

Description

  The present invention relates to a rising motion measurement system used for teaching and training of a rising motion that shifts from a chair sitting position to a standing posture in a convalescent rehabilitation for a patient with a balance function disorder or the like.

  Conventionally, as disclosed in Patent Document 1, for example, an apparatus used for training of balance of the trunk and movement of the center of gravity of the trunk, which measures the movement of the standing patient to move the center of gravity of the trunk. There is a center of gravity sway meter side device for quantitatively evaluating the recovery status of the patient's balance function. This center-of-gravity fluctuation measuring device includes a center-of-gravity measuring device that detects the center-of-gravity position of the trunk, a computing device that calculates the output of the center-of-gravity measuring device, a display device that displays the computation result of the computing device, and a storage device that stores the computation result. I have. The display device displays the target position of the center of gravity and the current trunk center of gravity position, continuously measures the distance between the target position and the trunk center of gravity position, sums the time for each distance, Displays the recovery status based on the sum of

JP 2005-253819 A

  For example, rehabilitation performed by a patient with balance function disorder due to hemiplegia or the like, an elderly person with a disability, etc., has different training contents depending on the recovery stage of the patient. The center-of-gravity sway measurement device of Patent Literature 1 is a device suitable for training performed after recovery to a stage where a patient can easily stand up, and is not suitable for training aiming at recovery of a standing motion that shifts from a chair sitting position to a standing position.

  In order to objectively evaluate the recovery status of a patient in training for standing up motion, it is important to grasp the positional relationship between the center of gravity of the entire body and the support base surface that supports the body. Since the chair is in the sitting position before starting the standing-up motion, the body is supported by the buttocks, the right foot, and the left foot, so the support base surface is a region surrounded by a closed envelope that touches the area where these three parts are grounded. . Further, in the standing state where the standing motion is finished, the body is supported by the right foot and the left foot, so that the support base surface is a region surrounded by a closed envelope in contact with the area where these two portions are grounded. Therefore, when the patient starts to move up, the shape of the support base surface gradually changes, and at the same time, the center of gravity of the body moves.

  A patient whose body's center of gravity always moves stably around the center inside the support base is less likely to fall and can be evaluated as recovering. On the other hand, if the patient's movement of the center of gravity is unstable and awkward, or the patient whose support base is too narrow (for example, a patient whose ground contact position of the right and left feet is too close), the center of gravity protrudes outside the support base. Because it is easy to do, it must be corrected with appropriate guidance and training.

  However, in the case of the center-of-gravity fluctuation measurement device of Patent Document 1, although it includes a center-of-gravity measurement device that detects the position of the center of gravity of the body, it does not include means for grasping the support base surface. The support basal plane changes depending on the patient's body shape and the contact position of the buttocks and both feet, and changes even if the contact is made only with the toes or heels of the feet or when the posture is unbalanced in the front / rear / right / left directions. Even if the caregiver observes the patient's side by side, it is difficult to grasp the exact support base surface. Therefore, the above-described center-of-gravity sway measurement device cannot objectively evaluate the recovery status of the rising motion of the patient, and is insufficient to perform accurate guidance and training.

  The present invention has been made in view of the above-described background art, and is capable of accurately grasping the positional relationship between the center of gravity of the entire body and the support base surface, and is capable of objectively evaluating the recovery status of a patient, and is a rising motion measurement system The purpose is to provide.

  The present invention includes a measuring device and a control device for the measuring device, and the measuring device is attached to the cradle table for supporting a buttock of a patient in a chair sitting position, a foot cradle for supporting a sole, and the cradle. And a sensor that detects a load applied to the upper surface and a pressure distribution, and the control device acquires detection information of the sensor, performs a predetermined process, and stores a processing result; and the process A display unit that displays a result, and the processing unit performs a process of calculating at least a center of gravity position and a support base surface of the entire body of a patient and displays the result on the display unit. .

  The footrest may include a right footrest that supports a right foot and a left footrest that supports a left foot, and the sensor may be attached to each of the feet.

  The sensor is composed of a plurality of load measurement sensors distributed and arranged at the peripheral edge of each cradle, and a sheet-like pressure distribution measurement sensor that measures the pressure distribution on the upper surface of each cradle, The processing unit calculates the position of the center of gravity based on detection information of the plurality of load measurement sensors, and calculates the support base surface based on detection information of the pressure distribution measurement sensor.

  Further, the processing unit repeats at least the operation of calculating the center of gravity position and the support base surface of the entire body of the patient until the patient transitions from the chair sitting position to the standing position. The state of the change may be displayed on the display unit.

  Further, the processing unit may cause the display unit to display a load and a gravity center position for each of the patient's buttocks, right foot, and left foot among the processing results of the processing unit.

  According to the rising motion measuring system of the present invention, since the center of gravity position, the support base surface, etc. of the whole body when the patient performs the rising motion are accurately measured and displayed, the doctor or caregiver can objectively determine the recovery status of the patient. Appropriate guidance and training can be given to the patient by evaluating and feeding back to it.

It is the front view (a) which shows the structure of the standing-up action measurement system of this invention, and the top view (b) which shows a measuring device. It is the figure (a) which shows the gravity center position and support base bottom in a chair sitting position, and the figure (b) which shows the gravity center position and support base bottom in a standing position. It is a flowchart explaining the algorithm in which the process part of this embodiment calculates a support base face. It is a figure which shows one display example of the measurement result displayed on the display part of this embodiment.

  Hereinafter, an embodiment of a rising motion measurement system according to the present invention will be described with reference to the drawings. The rising motion measurement system 10 according to this embodiment is a system used for teaching and training about a rising motion that shifts from a chair sitting position to a standing posture in a patient's recovery phase rehabilitation such as a balance function disorder. A measurement device 12 for measurement and a control device 14 for controlling the measurement device 12 by an operation by a doctor or a caregiver are provided.

  The measuring device 12 is placed on the upper surface of a seat 16a such as a chair, and supports a buttocks stand 16 that supports the seated patient's buttocks B, a substantially rectangular right foot stand 18 that supports the patient's right foot R, and a left foot. And a substantially rectangular left footrest 20 that supports L. A sensor for individually measuring the load and pressure distribution on each upper surface is attached to each cradle 16, 18, 20. Each sensor is dispersedly arranged at the four corners of the peripheral edge of each cradle 16, 18, and 20, and the load measuring sensor 22 for measuring the load received on the upper surface and the pressure distribution on the upper surface of each cradle 16, 18, and 20 are shown. It comprises a sheet-like pressure distribution measuring sensor 24 to be measured. The load measuring sensor 22 is, for example, a pressure sensor element whose self-impedance (electrical resistance, capacitance, etc.) changes according to the load. For example, the pressure distribution measuring sensor 24 can detect a pressure distribution by arranging a large number of small pressure sensor elements at equal intervals in the vertical and horizontal directions, and the magnitude of the self-impedance of each pressure sensor.

  The control device 14 includes a processing unit 26 and a display unit 28 configured using a personal computer or the like. The processing unit 26 supplies power for operation to the load measurement sensor 22 and the pressure distribution measurement sensor 24 of each pedestal 16, 18, and 20 to control the operation of the measurement device 12, and the load measurement sensor 22 outputs the power. Get detection information. Based on the acquired detection information, the load and the position of the center of gravity G (B), G (R), G (L) and the position of the center of gravity G (ALL) of the whole body are calculated for each of the buttocks B, the right foot R, and the left foot L. calculate. Further, the support base surface Q is calculated based on the detection information of the pressure distribution measuring sensor 24. Then, the processing result (calculation result, measurement date / time, measurement condition, patient name, etc.) is stored in a storage means such as a hard disk and is displayed on the display unit 28 in response to a request from a doctor or caregiver.

  The display unit 28 is a means for displaying the result of processing performed by the processing unit 26, and here is a display of a personal computer.

  Next, the operation of the standing action measurement system 10 will be described. When the patient is seated on the measuring device 12 (in the initial state of the rising motion), the buttocks B are on the upper surface of the buttocks stand 16, the right foot R is on the top surface of the right foot stand 18, and the left foot L is on the left foot stand 20. It is supported on the upper surface. In this state, the positions of the center of gravity G (B), G (R), G (L), and G (ALL) of the patient are the positions shown in FIG.

  The processing unit 26 acquires detection information output from the four load measuring sensors 22 of the heel stand 16 and calculates the load applied to the heel stand 16 and the position of the center of gravity G (B) of the heel B. Similarly, the detection information output by the four load measuring sensors 22 of the right foot rest 18 is acquired, and the load applied to the right foot rest 18 and the position of the center of gravity G (R) of the right foot R are calculated. Similarly, the detection information output by the four load measuring sensors 22 of the left footrest 20 is acquired, and the load applied to the left footrest 20 and the position of the center of gravity G (L) of the left foot L are calculated. Based on the detection information output from all the load measuring sensors 22, the position of the center of gravity G (ALL) of the entire body is calculated.

  Further, in the chair sitting position, the support base surface Q is a closed region connecting the outside where the buttocks B, the right foot R, and the left foot L are grounded. The processing unit 26 acquires the detection information output from each pressure distribution measurement sensor 24 of each cradle 16, 18, 20 and calculates the support base surface Q. Hereinafter, an example of an algorithm by which the processing unit 26 calculates the support base surface Q will be described using the flowchart of FIG.

  First, out of a large number of pressure measurement points where the pressure sensor elements in the pressure distribution measurement sensor 24 are arranged, only the measurement point whose pressure measurement value is equal to or greater than the reference value is extracted as an effective measurement point P (step S11). . As a result, the detection information of the measurement point whose measurement value is less than the reference value is ignored as “noise information with low reliability”, and is excluded from the processing target in the subsequent steps.

  Next, the coordinates (Xh, Yh) of the average coordinate point H of the coordinates (X, Y) of each effective measurement point P are calculated (step S12). The average coordinate values Xh and Yh are calculated by arithmetically averaging the coordinate values X and Y of each effective measurement point.

  Next, the effective measurement points P are rearranged based on the value of each X coordinate, and i is assigned in order from the smallest value (i = 0, 1, 2,..., N). Then, the effective measurement point P0 is identified as the first point S0 of the contour constituent points Sk. (Step S13).

  Subsequent steps S14 to S18 are steps for sequentially extracting contour constituent points Sk other than the first contour constituent point S0. First, among the contour constituent points Sk identified so far, a number where k is the maximum is set as j, and a first vector Uj directed from the contour constituent point Sj to the average coordinate point H is obtained (step S14).

  Further, a second vector Vij from the contour constituent point Sj to the effective measurement point Pi is obtained (step S15). However, if the contour constituent point Sj and the effective measurement point Pi are the same in step S15, step S15 is not performed.

  Next, for the first and second vectors Uj and Vij obtained in steps S14 and S15, an angle θij between the vectors is calculated (step S16). The angle θij can be calculated using an arc tangent function expressed by the following equation (1).

θij = atan2 (Uj · Vij, | Uj × Vij |), −π <θij <+ π (1)
Here, “Uj · Vij” is an inner product of two vectors, and “Uj × Vij” is an outer product of two vectors.

  Next, when j is fixed, an effective measurement point Pi corresponding to i having the maximum angle θij is extracted, and it is determined whether or not that point is the same as the first contour constituent point S0. If the coordinate values of the two points do not match, it is determined “NO (not the same)” and the process proceeds to step S18. If they match, the determination is “YES (same)” and the process proceeds to step S19. (Step S17).

  If “NO” is determined in the step S17, the previously extracted effective measurement point i is specified as the next contour constituent point S (j + 1) following the contour constituent point Sj. Then, the process proceeds again to step S14 (step S18). By repeating the above steps S14 to S18, the contour constituent points Sk can be extracted in order.

  If “YES” is determined in the step S17, all the contour composing points Sk have been extracted up to the previous step S17, so that the extracted contour composing points Sk (k = 0, 1,...) Are k. Are connected in ascending order, and the polygon surrounded by the connected lines is identified as the support base surface Q (step S19).

  The above steps S11 to S19 are merely examples of the algorithm for calculating the support base surface Q. For example, in step S13, i is assigned in order from the largest X coordinate value (i = 0, 1, 2..., N), in step S17, the method may be changed such that the effective measurement point Pi having the smallest angle θij is extracted.

  Further, if the calculation method can calculate the support base surface Q based on the output information of the pressure distribution measurement sensor 24, the calculation method may be different from the algorithm described above.

  The processing unit 26 calculates the position of the patient's center of gravity G (B), G (R), G (L), G (ALL) and the support base surface Q in such a flow, and the measurement result includes the measurement date and time, The measurement conditions, patient name, etc. are added to the storage means such as a hard disk, and the measurement of the chair sitting position is completed.

  When the patient is standing, the buttocks B are separated from the buttocks stand 16, the right foot R is supported on the upper surface of the right foot stand 18, and the left foot L is supported on the upper surface of the left foot stand 20. Accordingly, the position of the patient's center of gravity G (B), G (R), G (L), G (ALL) and the support base surface Q are as shown in FIG. And the left foot L becomes a narrow region that is connected to the outside where it contacts the ground, and the center of gravity G (ALL) is a position on the line connecting the centers of gravity G (R) and G (L). The processing unit 26 also calculates the position of the patient's center of gravity G (B), G (R), G (L), G (ALL) and the support base surface Q for the standing state as described above. The measurement date and time, measurement conditions, patient name, etc. are added to the result and stored in a storage means such as a hard disk, and the standing position measurement is terminated.

  For the body posture in the middle of the transition from the chair sitting position to the standing position, the operation for calculating each center of gravity G and the support base surface Q is repeatedly measured at high speed. As the number of repetitions increases, the process of changing each center of gravity G and the support base surface Q can be grasped in more detail, so that the rising motion can be easily analyzed.

  The display unit 28 displays the processing result of the processing unit 26 in response to a request from a doctor or caregiver. FIG. 4 shows an example of the display screen. On the left side of the screen, the position of the center of gravity G (B), G (R), G (L), and G (ALL) of the patient and the support base surface Q are displayed. It is drawn over the schematic diagram seen from above. In addition, the position of the center of gravity G (ALL) represents the trajectory that the patient moves from the sitting position to the standing position, and the other center of gravity G (B), G (R), G (L) For the position and the support base surface Q, the calculation result of the standing state is shown. If there is a request from a doctor or the like, it is possible to display changes in the center of gravity G (R) and the support base surface Q. Further, if the trajectory measured last time (for example, one week ago) is displayed in an overlapping manner, the difference between the previous time and this time can be seen at a glance, and the degree of recovery of the patient can be easily grasped.

  In addition, the loads of the heel B, the right foot R, the left foot L, and the like are displayed in the margins around the positions of the centers of gravity G and the support base surface Q. The “right / left balance” in FIG. 4 is the ratio of the load on the right foot R and the left foot L, and the “load ratio” is the ratio of the current load to the maximum value of the load measured recently (for example, one week ago). This “left-right balance” is effective in detecting that the load is not concentrated too much on one leg in the process of standing up, and it is also possible to evaluate the recovery status of the left-right balance using the “load factor”. .

  In addition, on the right side of the screen, a graph showing a change in load on the right foot R and the left foot L is displayed. The graph measured last time (for example, one week before) may be displayed in an overlapping manner so that changes in the recovery status of the patient can be seen at a glance.

  As described above, according to the rising motion measurement system 10, the characteristics of the rising behavior such as the position of the center of gravity G (ALL) of the whole body and the support base surface Q when the patient performs the rising motion are grasped. Since various data can be measured and displayed with high accuracy, doctors can objectively evaluate the patient's recovery status and provide feedback to give appropriate guidance and training to the patient. .

  In addition, a trajectory in which the position of each center of gravity G changes, a state in which the support base surface Q changes, a load for each of the right foot R, the left foot L, and the buttocks B and a position of the center of gravity G are displayed. By overlaying the current measurement results on the past measurement results stored in the table, it is possible to evaluate the multifaceted evaluation of wrinkles, features, recovery status, etc. when the patient stands up. Can provide guidance and training.

  The rising motion measurement system of the present invention is not limited to the above embodiment. For example, the footrest may be a single footrest on which the left and right feet are placed, and only needs to be able to calculate the support base surface with both feet placed. The shape and size of the buttocks table, right foot table and left foot table of the measuring device can be in an oval, circular or other shape as long as the load and pressure distribution of each part of the patient (buttock, right foot, left foot) can be measured. Can be changed. In addition, the sensor for measuring the load and pressure distribution can freely select or set the sensor element form (type, shape, number, etc.) as long as it outputs necessary detection information to the processing unit. .

  The display unit constituting the control device may be printed on paper through a printer or the like and displayed instead of the display as described above. The display method is not particularly limited, and forms such as a table, a drawing, and a graph can be freely selected and combined.

DESCRIPTION OF SYMBOLS 10 Standing action measurement system 12 Measuring device 14 Control device 16 Saddle stand 18 Right foot stand 20 Left foot stand 22 Load measuring sensor 24 Pressure distribution measuring sensor 26 Processing part 28 Display part B Hip part L Left foot R Right foot G (B) , G (L), G (R) Center of gravity Q Support base

Claims (5)

It has a measuring device and its control device,
The measuring device includes a buttocks pedestal that supports a buttock of a patient in a chair sitting position, a foot cradle that supports a sole, and a sensor that is attached to the pedestal and detects a load and pressure distribution applied to the upper surface thereof. Consists of
The control device is configured with a processing unit that acquires detection information of the sensor, performs predetermined processing, stores the processing result, and a display unit that displays the processing result,
The rising motion measurement system, wherein the processing unit performs a process of calculating at least a center of gravity position and a support base surface of the entire body of a patient, and displays the calculated value on the display unit.   2. The rising motion measurement system according to claim 1, wherein the footrest includes a right footrest that supports a right foot and a left footrest that supports a left foot, and the sensor is attached to each of the platforms. The sensor is composed of a plurality of load measurement sensors distributed and arranged on the peripheral edge of each cradle, and a sheet-like pressure distribution measurement sensor that measures the pressure distribution on the upper surface of each cradle,
The said process part calculates the said gravity center position based on the detection information of these sensors for load measurement, and calculates the said support base face based on the detection information of the said sensor for pressure distribution measurement. Rising motion measurement system.   The processing unit repeats at least the operation of calculating the center of gravity position and the support base surface of the entire body of the patient until the patient transitions from the chair sitting position to the standing position. The rising motion measurement system according to claim 1 or 3, wherein a change state is displayed on the display unit. 5. The rising motion measurement system according to claim 1, wherein the processing unit displays, on the display unit, a load and a gravity center position of a patient's buttocks, right foot, and left foot among processing results of the processing unit.

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