JPH0428353A - Judging device for oscillation of center of gravity - Google Patents

Abstract

PURPOSE:To judge the condition of an inspected person properly and speedily by displaying the relation position coordinates between the area of the rectangular shape and the locus length of the position of the center of gravity of an inspected person on a display device, and by displaying the area set line, locus length set line, and each region display on the display surface. CONSTITUTION:Load sensors 2, 3 and 4 are installed on a stepping board 1, and the oscillation area and the oscillation locus length which show the variation region of the position of the gravity center are calculated by the second calculation circuit 10 from the change of the position of the gravity center through the lapse of time, which is obtained by inputting the above-described detection signals into the first calculation circuit 5. From the result of the calculation, the relation between the oscillation area and the oscillation locus length is displayed by a display device 6, and the judgement region for judging the oscillation of the gravity center of an inspected person is set for the display on a display device 6 by a stetting circuit 7. Accordingly, the disease of an inspected person which is based on the oscillation of the center of gravity is division- positioned on the display device 6, and the symptom and the degree of recovery of the inspected person can be judged speedily and correctly.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a center-of-gravity sway determination device that determines the symptoms and degree of recovery of a subject based on fluctuations in the position of the center of gravity of the subject.

<Conventional technology> The upright standing posture is the basic posture of humans, and by understanding the position of the center of gravity and the state of sway of the center of gravity when this posture is taken, it is possible to improve the physical function of the subject through clinical examinations, diagnosis, and rehabilitation. It is possible to check the degree of recovery of patients and to understand the state of drug addiction.

Figure 3 is a block diagram showing the configuration of a conventional center of gravity sway meter.
A load sensor 2 is installed at each vertex position of the isosceles triangular step stool 1 on which the subject stands. 3. 4 are attached to each load sensor 2. 3. 4 are connected to the input terminals of the center of gravity calculation circuit 5 through signal lines, and the output terminal of the center of gravity calculation circuit 5 is connected to the display 6.

Set the x-y coordinates with the load sensor 2 position as the origin, the load sensor 3 coordinates (2+rnL), the load sensor 4 coordinates (-Q, m), and the subject's center of gravity position (x, y). ,
The weight of the subject is measured by the load sensor 4. , 3. If the detected load of 2 is PI, P2 + P3, then W = P
+ + P 2 + P 3, and the following equation is obtained from the moment equilibrium condition.

P2QW-X=P+9...
......Equation (2) is obtained from Equation (1).

Similarly, by ζ, equations (3) and (4) are obtained.

W −y =mP ++m P2−− (3) In FIG. 3, load sensor 2. 3. The detected load signal from 4 is input to the center of gravity calculation circuit 5, and the center of gravity calculation circuit 5
Based on these detection signals, calculations shown in equations (1) to (4) are performed with the position of the load sensor 2 as the origin.

The center of gravity calculation circuit 5 outputs the center of gravity position signals x and y obtained by the calculations of equations (2) and (4), and inputs them to the display 6. The display 6 displays a trajectory 7 based on the center of gravity position signal It is possible to check the degree of recovery of physical functions through rehabilitation, ascertain the state of drug addiction, etc.

<Problems to be Solved by the Invention> A locus 7 of the center of gravity position is displayed on the display 6 of the conventional center of gravity oscillation meter, and a rectangular area created by the maximum value of the X+5' coordinate based on this locus 7 is displayed. , the envelope area created by connecting the maximum values of the polar levers, and the area of the SD section created based on the standard deviation values of the X and y coordinates were calculated. The patient's symptoms and degree of recovery were determined empirically from the trajectory length and the obtained rectangular area, envelope area, or SD area.

The present invention was made in view of the current situation in determining the symptoms and degree of recovery of subjects due to center of gravity sway as described above, and its purpose is to determine the locus length, rectangular area, envelope area, or S of the center of gravity position.
The object of the present invention is to provide a center of gravity sway determining device that can quickly and accurately determine the symptoms and degree of recovery of a subject based on the correlation between the area of the D section and the display on the display.

Means for Solving the Problems> In order to achieve the above object, the present invention provides a step stool on which a subject stands, a plurality of load sensors connected to the step stool, and load detection signals of these load sensors. a first calculating means for producing the center of gravity position of the subject based on the above, and from temporal fluctuations in the center of gravity position calculated by the first calculating means,
a second calculation means for calculating an oscillation area and an oscillation trajectory length indicating a variation area of the center of gravity; and a display displaying a relationship between the oscillation area and the oscillation trajectory length from the calculation results of the second calculation means. and a setting means for setting a determination area for determining the sway of the center of gravity of the subject on the display by the display means.

<Function> In the present invention, the center of gravity position of the subject is calculated by the first calculation means, and from the temporal fluctuation of the center of gravity position calculated by the first calculation means, the sway area indicating the variation area of the center of gravity position is determined. and the oscillation trajectory length are calculated by the second calculation means.

Then, the display means displays the relationship between the obtained sway area and the sway trajectory length, and the setting means sets a determination area for determining the center of gravity sway of the subject on the display by the display means.

<Example> Hereinafter, one embodiment of the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram showing the configuration of the embodiment, in which a step stool 1 is provided with a load sensor 2. 3. 4 are installed and these load sensors 2. 3. The detection signal No. 4 is input to the first arithmetic circuit 5. The detection signal of the first arithmetic circuit 5 is
Input to amplifiers 11a to lid, amplifiers 11a, ll
The output terminal of b is connected to the input terminal of the area calculation circuit 13 via peak hold circuits 14a and 14b.

The peak hold circuits 14a and 14b are well-known circuits that include, for example, a capacitor and a diode, and input the bolded maximum value of the detection signal to the area calculation circuit 13. The output terminal of the area calculation circuit 13 is connected to the display 6.

The output terminal of the amplifier 11c is connected to one input terminal of a subtraction circuit 16c, and is also connected to the other input terminal of the subtraction circuit 16c via a delay circuit 15c. The output terminal of this subtraction circuit 16c has a square calculation circuit], 7c
are connected, and the output terminal of the square calculation circuit 17c is connected to one input terminal of the square root integration circuit 18.

Similarly, the output terminal of the amplifier lid is connected to the delay circuit 15.
d, is connected to the other input terminal of the square root integration circuit 18 via a subtraction circuit 16d and a square calculation circuit 17d.

The output terminal of the square root integration circuit 18 is connected to the display 6, and the output terminal of the setting circuit 7 is connected to the display 6.

In this configured embodiment, amplifiers 11a, Il
b, peak hold circuit 1.4a, 14b area calculation circuit 13, delay circuit 15c, 15d, subtraction circuit 16c, 16
d, the square calculation circuit 17c1ff7d and the square root integration circuit J8 constitute the second calculation circuit 10.

Next, the operation of the embodiment will be explained.

When the subject steps on the step stool 1, the detection signal from the load sensor 234 is taken into the first arithmetic circuit 5, and as explained using FIG.
2) The center of gravity position is calculated using equation (3).

The X-coordinate signal of the center of gravity position output from the first arithmetic circuit 5 is manually input to the amplifier 11a, shaped and amplified, and then input to the peak bold circuit 14a.

The peak bold circuit 14 a bolds the maximum value in the input X coordinate signal, and the area calculation circuit 13 receives the maximum value signal X m a x of the X coordinate signal. In exactly the same way, the peak hold circuit 14b inputs the maximum value signal YmaX among the X coordinate signals to the area calculation circuit 13.

Based on these coordinate signals, the area calculation circuit 13 calculates
The rectangular surface fff S + is calculated using the following equation.

S+ = Xma

On the other hand, the X coordinate signal of the center of gravity position output from the first arithmetic circuit 5 is input to the amplifier 11c, shaped and amplified, and inputted to one input terminal of the subtraction circuit 16c. at the same time,
The X-coordinate signal outputted from the 1-magnifier 11c is delayed by the ()-amble fetching time interval in the delay circuit 15c, and then inputted to the other input terminal of the subtraction circuit 16c. The subtraction circuit 16c performs a difference calculation between the input X coordinate signals having a difference in sample acquisition time, and a signal expressed by the following equation is manually inputted to the square calculation circuit 17c.

Xn Xo−+=△xo・・・・・・・・・・・・・
...(1) Here n=2. 3. 4... is.

The square calculation circuit 17c performs the square calculation of equation (1) as (2
) is done as in Eq.

(X, −X, −1)2−Δ,,2−・−−−・−(,
2) In exactly the same way, the Yv: reference signal of the center of gravity position output from the first arithmetic circuit 5 is manually input to the amplifier lid,
Based on this X coordinate signal, the square calculation circuit 17d (
3) The equation is squared.

(y, -y n-1) 2=△Y,"-...-(
3) The square root integration circuit 18 calculates the following equation based on the signals calculated by equations (2) and (3).

(X2 x+) 2+ (y2 y+) 2+(X
3-x2> 2+ (y3-y2) 2+...
...10...+(Xn Xn-1) 2+ (yn
-yn-1) 2・・・・・・・・・・・・ (4) What is calculated by equation (4) is the center of gravity trajectory length, and the signal of this center of gravity trajectory length is displayed manually on the display 6. be done.

FIG. 2 is an explanatory diagram showing the display of the display in the embodiment. Based on the signal of the rectangular area S1 output from the area calculation circuit 13 and the signal of the barycenter trajectory length output from the square root integration circuit 18, The display 6 displays a coordinate system with the rectangular area S1 as the horizontal axis and the center of gravity locus length as the vertical axis.

When the area is set in the setting circuit 7, the area setting line 21 and the trajectory length setting line 22 are set by the setting area signal from the setting circuit 7.
is displayed on the display surface of the display device 6. Furthermore, when display settings are made in the setting circuit 7, the displays 23a to 23d of each area set by the area setting line 21 and the locus length setting line 22 are displayed on the display 6 according to the display setting signal from the setting circuit 7. displayed on the display screen.

In this manner, according to the embodiment, the correlation position coordinate between the rectangular area of the subject and the locus length of the center of gravity position is displayed on the display surface of the display device 6. Then, on this display surface, an area setting line 21,
A trajectory length setting line 22 and displays 23a to 23d are displayed.

Therefore, based on these displays and the correlated position coordinates, it is determined that the subject is currently in a state of neurological ataxia, and necessary therapeutic measures are administered.

In addition, in the example, the rectangular area is shown on the horizontal axis of the display.
Although a case has been described in which the trajectory length is displayed on the vertical axis, the present invention is not limited to the embodiments. For example, the vertical axis of the display may display a rectangular area, or not only the rectangular area but also the SD section area and envelope area. You can also display the trajectory length on the horizontal axis.

<Effects of the Invention> As explained in detail above, according to the present invention, the symptoms of the subject based on the sway of the center of gravity are categorized and positioned on the display 2, so the symptoms of the subject can be determined accurately and quickly. You can.

-11~

[Brief explanation of the drawing]

Figure 1 does not show the configuration of an embodiment of the present invention; Figure 11379;
FIG. 2 is an explanatory diagram showing a display on a display according to an embodiment of the present invention, and FIG. 3 is a block diagram showing the configuration of a conventional center of gravity oscillation meter. 1... stepping stone, 2. 3. 4...Load sensor, 5
...First arithmetic circuit, 6...Display device, 7...Setting circuit, 10...Second arithmetic circuit, Ila to Ild.
...Amplifier, 13...Area calculation circuit, 14a, 14b
...Peak hold circuit, 15c, I 5 d ・
...Delay circuit, 16c, 16d...Subtraction circuit, 17c
, 17d... Square calculation circuit, 18... Square root integration circuit. Procedural amendment September 10, 1991 Wataru Fukasawa, Commissioner of the Japan Patent Office 1゜ Indication of the case 2008 Patent Application No. 4.9265 2 Name of the invention Center of gravity sway determination device 3 Person making the amendment 4 Order for amendment Date spontaneous amendment 5° No number of inventions to be increased by the amendment 6° Target of the amendment 7° Contents of the amendment Page 1, line 2, "Device for determining center of gravity sway" is amended to "center of gravity sway determining device."

Claims (1)

[Claims] a step stool on which the test subject stands; a plurality of load sensors attached to the step board; a first calculation means for calculating the center of gravity position of the test subject based on load detection signals from these load sensors; a second calculation means for calculating a sway area and a sway locus length indicating a variation area of the center of gravity from the temporal fluctuation of the center of gravity position calculated by the first calculation means; and a calculation result of the second calculation means. Accordingly, the method includes a display means for displaying the relationship between the sway area and the sway trajectory length, and a setting means for setting a determination area for determining the center of gravity sway of the subject on the display by the display means. Features: Center of gravity sway determination device.