SU835416A1 - Dynamometric tester - Google Patents

Description

one

The invention relates to medicine and can be used for carrying out samples with dosed isometric muscle tension in the study of the functional state of the circulatory system, in the evaluation of rehabilitation programs, in the regulation of the labor activity of healthy and especially cardiovascular and pulmonary diseases of persons, with mass population surveys.

Known torque tester containing a force sensor and a display unit. When performing the test, the subject squeezes the receptive part of the device, controlling the level of force developed by the display unit. The required dose of physical activity is calculated as a percentage of the maximum effort that a patient is able to develop. 1

However, this device has the following disadvantages:

- in the process of investigation, the reaction of the circulatory system is significantly distorted, since the digitized indicator scale requires attention from the subject during the performance of the test;

-the time spent by the doctor is not productive, since he calculates the effort required for the test

each time new testing and monitoring of the moment of impoverishment begins;

- there is a low accuracy of determining the moment of weakening (exhaustion), since this moment is subjectively fixed by the subject himself.

All these shortcomings make the device ineffective in clinical practice, and especially during mass examinations of patients.

The aim of the invention is to improve the accuracy and reduce the testing time.

This goal is achieved by the fact that the device is equipped with a "Stress-voltage converter, a peak detector, two voltage dividers, two voltage comparators, a switching and control unit, a time relay, while the Stress-voltage converter input is connected to the sensor output effort, and the output - with the input of the peak detector and the first inputs of the voltage comparators; the output of the peak detector is connected to the inputs of the voltage dividers, the outputs of which are connected to the second inputs of the voltage comparators, enes to the inputs of switching and control unit which outputs are connected to inputs bloka indication by control inputs "Start" Reset timer relay and an input "reset the peak detector.

The display unit is made in the form of a sectional light information board containing an index of actions of the patient.

The drawing shows a block diagram of a torque tester.

The dynamometer tester contains a force sensor 1, the output of which is through a linear converter 2. The force-voltage is connected to the input of the peak detector 3. The output of the detector 3 is connected to the inputs of the first voltage divider 4 and the second voltage divider 5. The outputs of the dividers 4 and 5 of the voltage are connected to the first inputs of the comparators 6 and 7 of the voltage, the second inputs of which are connected to the output of the converter 2 "Stress-voltage. The outputs of the Comparators 6 and 7 are connected to the inputs of the switching and control unit 8. The outputs of block 8 are connected to the corresponding sections of the light display of block 9 of the display, the inputs of the time controlled by relay 10, and the input "Reset peak detector 3.

The output of the time controlled relay 10 is connected to the light panel of the display unit 9 and the output terminal.

The device works as follows. In the Preparation mode, the determination of the maximum force developed by the patient is made. This force is converted to voltage by transducer 2 and remembered by peak detector 3. Of several attempts, the largest value is memorized by peak detector. In the mode “Prepare all indicators are disabled.

In the "Testing Patient Defeat" mode

live effort at the level - where mouths -

maximum force detected by peak detector 3; l is the division factor selected in the range of 1.1-10.

The division factor n is set by voltage dividers 4 and 5. The signal is proportional to the force, is fed to the first inputs of the Comparators 6 and 7, the other inputs of which receive signals from the outputs

dividers 4 and 5 are equal.

and i.

“2

The values of the division coefficients rti and n are chosen based on the patient's possible efforts near the level of oscillation. In practice, this "hold window is

within 5% of -.

So for example, with pg it will be about 3.15, and “1 will be equal to 2.85.

The signals from the outputs of the comparators 6 and 7 are sent to the switching and control unit 8, which issues the appropriate commands to the display unit 9, made in the form of light indicators "Add," Turn off, "Norm. One of these pointers is highlighted by the indicator board and is easily perceived by both the subject and the doctor. Indicator indicator "Norm will be included if the input signal is proportional to

effort will lie within D and

one

D. At input values,

“2

much d. indicator on

“J

“Turn it down. At lower input values, the indicator turns on.

“2

“Add on.

During the testing process, the moment of debilitation (fatigue) is automatically monitored. With

In this case, the switching and control unit 8 generates a start signal, which arrives at time relay 10 when the force transitions from the value “Normal to the value” to add and the signal “Reset when the force transitions from the value to“ Add to the value “Norm. If the patient does not have time to reset the time relay 10 for a certain, predetermined time interval, then the time relay 10 generates a signal "End, which is displayed on the information board, and the control unit 8 generates a signal that is fed to the input" Reset peak detector 3, whereupon the testing of the patient ends. The device returns to its initial state (in the "Preparation" position) by the switching and control unit 8. As a result of this implementation of the torque tester, accuracy is increased and testing time is shortened.

Claims (1)

Invention Formula A dynamometer tester containing force sensors and a display unit, characterized in that, in order to improve accuracy and reduce testing time, it is equipped with a "force-voltage converter, peak detector, two voltage dividers, two voltage comparators, a switching unit and control, time relay, while The input voltage converter is connected to the output of the force sensor, and the output is connected to the input of the peak detector and the first inputs of the voltage comparators, the output of the peak detector is connected to the inputs of the voltage dividers, the outputs of which are connected to the second inputs of the computer comparators whose outputs are connected with the inputs of the switching and control unit, the outputs of which are connected to the inputs of the display unit, the control inputs Start, Reset, time relay and input Reset peak detector. Sources of information taken into account in the examination 1. Thorevsky V.I. and Razinov R. A quanta dynamometer for studying the strength and endurance of the muscles of the forearm. - “Occupational and occupational health, 1972, M, No. 3, p. 46-48.