RU3536U1 - DEVICE FOR CONTROL OF POSITION OF THE HUMAN BONE-MUSCULAR APPARATUS - Google Patents

Abstract

1. A device for monitoring the position of the musculoskeletal system of a person, comprising a position sensor configured to be fixed on the user and connected via an electronic assembly to a signaling device that generates a warning signal, characterized in that the position sensor is made in the form of a strain gauge mounted on an elastic plate. 2. The device according to claims 1 and 2, characterized in that the electronic node comprises a connected threshold unit and a delay unit. 3. The device according to claim 1, characterized in that the length of the elastic plate is selected in the range of 50 - 100 mm

Description

g The proposed device relates to the field of medicine and sports, namely, biological feedback devices and can be used in orthopedics, in particular pediatric orthopedics for the prevention of stoop, by self-correcting posture, to monitor the position of the muscles of the trainee (biceps force) of the trainee, for the functional state the body of the operator in the process of his work, etc. There is a known method of monitoring the posture of a person in which the human body (elements of the bone skeleton) is given the correct position and when deviating from this position Ia to individually predetermined limit deflection, considered as invalid, nepravlnoe recorded position of the user and prevent it or operator through various types of notifications signal (sound, light or other impact) / RU, C1, 2016545 /. This method is used to prevent and correct posture by self-correction, and it can also be used to monitor the functional state of the human body in the process of performing labor operations. Devices that implement this method, as a rule, contain a relay type position sensor connected via an electronic node, with a signaling device that affects the senses

person.

It is known, for example, a device / SU, A3,1800965 / for registering the head tilt, comprising a mount, the upper end of which is curved arcuate to cover the human auricle, and an electromagnet is fixed at the lower end, the anchor of which is freely suspended on an axis located above the electromagnet . In this case, the anchor with its upper end interacts with the normally open contacts fixed on the node. The electromagnet is connected to the power source through the contacts and connector.

The device is designed to monitor the state of the driver of the vehicle.

In the vertical position of the head, the anchor with its plane is oriented vertically and the contacts are open. When the head is tilted, for example, due to driver fatigue, the anchor rotates around its axis, closing the contacts. As a result, the electromagnet is turned on and the anchor is attracted. At the same time, the contacts open again and the power supply circuit of the electromagnet is interrupted, which leads to the impact of the armature on the auricle of the driver, indicating an unacceptable tilt of the head.

The described device has a simple design, however, it is not convenient enough to operate, due to the fact that almost any random tilt of the head causes the device to trigger. It can also trigger a device.

bring the anchor into contact with the driver’s clothes, since the anchor is not fixed on his body.

In addition, the specified device has a fairly narrow scope.

Closest to the proposed utility model is a device for monitoring posture / SU, A1, 1768136 /, containing a position sensor connected via an electronic node that includes a delay unit, with a signaling device that generates a warning signal about a violation of posture. According to the simplest version, the position sensor is equipped with fastening elements for fixing it to the user and includes two movable strips connected by a hinge and equipped with electrical contacts that are closed by a spring-loaded screw regulator. The position sensor is placed on the back of the user so that the hinge is at the level of the controlled segment of the spine. For a given pose of a person, by moving the spring-loaded regulator, close the electrical contacts. With an increase in the curvature of the controlled segment of the spine, the electrical contacts open and the delay unit of the electronic unit is triggered, which does not pass signals to the annunciator during short-term (1-2s duration) human movements. From the electronic unit with the delay unit, the signal passes to the annunciator only if the signal duration exceeds the time for which the delay unit is configured. The signal passed to the signaling device in the form of an audio or light indication gives the user information about his incorrect position and he corrects his posture. , Rectification of the spinal segment to which the position sensor is attached leads to the closure of electrical contacts and the termination of the signaling device. The ability to fix the position sensor on the user's body, as well as the presence of a delay unit, protects the device from accidental operation due to short-term patient movement or other interference. However, the rather complicated design of the position sensor necessitates a special adjustment of the device on the user's body: installing the hinge on a given segment, closing electrical contacts by a spring-loaded screw regulator, which complicates the operation of such a device for the mass consumer and limits its scope. The presence of lockable-openable electrical contacts determines the low reliability and reliability of the signal output of the described device, in particular the possibility of generating false signals. In addition, in the above-described devices, relay-type sensors are used, which make it possible to obtain information only on the fact of a change in position, rather than quantitative information on the indicated change in the position of the musculoskeletal system, which limits the functionality of these devices.

a device for monitoring the position of the musculoskeletal system of a person in which the position sensor would have such a design that would expand the functionality of the device and increase its reliability.

The problem is solved in that in the device for controlling the position of the musculoskeletal system of a person containing a position sensor, configured to be fixed on the human body and connected through an electronic assembly with a signaling device that generates a signal - a notification, according to the technical solution, the position sensor is made in the form of a strain gauge rigidly mounted on an elastic plate.

A change in the position of the musculoskeletal system of a person, for example, a change in his posture is accompanied by a bending of a flat plate and, due to the rigid fastening of the strain gauge on this plate, the deformation of the strain gauge, which under the influence of deformation changes its electrical resistance. The electrical signal corresponding to the strain gauge strain is converted by the electronic unit into a user alert signal, acting on his senses, for example, into an audio or light signal. Thus, an elastic plate with a strain gauge rigidly fixed on it plays the role of a reliable, easy-to-use position sensor that does not require individual adjustment after fixing to the user.

receive quantitative information about this change, which extends the functionality of the proposed device, for example, allows you to use it to control the state of the user's muscles,

In many cases, for example, when using a device for controlling posture, it is advisable to include a threshold block and a delay block in the electronic assembly.

After fixing on the back of the user, the elastic plate constantly experiences minor deformations, which, however, do not indicate a violation of posture. The electrical signals of the strain gauge with levels corresponding to such deformations should not lead to a warning signal, which is achieved with the help of a threshold block that generates an output signal only when the electric signal from the strain gauge supplied to its input exceeds a predetermined threshold level corresponding to specified unacceptable violation of posture. Similarly, the delay unit prevents the warning signal from occurring if the threshold level is exceeded for a short time by the signal from the load cell, which can occur when the user bends for a short time interval (2-3s) and then straightens up.

For these purposes, it is also advisable to perform an elastic plate with a length of 50 mm to 100 mm.

Active control of posture, and with a length greater than that indicated, wearing the sensor causes inconvenience to the patient.

In the future, the device proposed as a utility model is illustrated by a description of an example of its implementation with reference to the accompanying drawings, where:

figure 1 depicts a block diagram of a device

figure 2 is a functional diagram of an electronic node and a signaling device,

depicted in figure 1, fig.Z - voltage diagram at the output of the blocks depicted in

figure 2, figure 4 - position sensor.

A detailed description of the device for monitoring the position of the musculoskeletal system of a person will be given on the example of its implementation to control posture. The proposed device comprises a position sensor 1 / Fig. 1/ connected to the input of the electronic node 2, the output of which is connected to the signaling device 3, which generates a signal-warning about violation of posture.

Schematically depicted in FIG. 4, the position sensor 1 is an elastic plate 4, for example, of steel, on which the strain gauge 5 is rigidly fixed. As a strain gauge 5, for example, a constant-wire strain gauge or tape, or a semiconductor strain gauge glued to the elastic plate 4 can be used.

The optimal length of the elastic plate 4 is in the range of 50 to 100 mm. When the length of the elastic plate is less than the lower limit, effective control of posture is difficult, and when the length is greater than the specified upper limit, wearing the sensor causes inconvenience to the user.

In other applications of the device, for example, to monitor the state of the muscles of the user engaged in the simulator, or the muscles of the athlete, the plate 4 may be smaller.

The position sensor 1 is configured to be fixed on the user's body. In particular, it can be equipped with fastening elements 6 to the body of the user, for example, with a plaster, or it can be sewn into clothing elements, for example, suspenders, or a tight T-shirt.

The electronic unit 2 includes a generator 7 (Fig. 2/) of sinusoidal oscillations with a frequency fo, a bridge circuit 8, one of whose arms includes a strain gauge 5, an amplifier 9, an envelope detector 10 (for example, a synchronous detector), a threshold block 11

/ for example Schmitt trigger /, delay unit 12, containing a single-vibrator 13 and - NOT / for example, Schiffer element /, modulator 15 and sine oscillator 16 with frequency fl.

In this case, the first output of the generator 7 is connected to a bridge circuit 8, the output of which is connected to an amplifier 9 connected to the first input of the envelope detector 10. The second output of the generator 7 is connected to the second input of the envelope detector 10, the output of which is below. keys to the signaling device 3, the threshold block 11, and to the first input of the modulator 15. The first output of the threshold block 11 is connected to the first input of the AND-NOT circuit of the delay unit 12, and the second with a single-vibrator 13, the output of which is connected to the second input of the And-14 circuit NOT. The output of the indicated circuit 14, which is the output of the delay unit 12, is connected to the second input of the modulator 15, to the third input of which a sine oscillation generator 16 with a frequency fl is connected. The output of the modulator 15 is connected to the signaling device 3. The signaling device 3 contains an electronic unit 17, the first input of which is connected to the output of the modulator 15, and the second to the output of the envelope detector 10, and two indicators: an acoustic emitter 18 connected to the first output of the electronic unit 17 and a light an indicator 19 connected to the second output of the electronic unit 17. The device, with the exception of the position sensor 1, the acoustic emitter 18 and the indicator light 19, is mounted in a plastic case / not shown /, convenient for carrying in a pocket. The device is powered by self-contained batteries, also located in the case. Other embodiments of a device for controlling the position of the musculoskeletal system may be proposed, not exceeding the scope defined by the attached utility model formula. In particular, it is possible to implement the device without a threshold block and a delay block, for example, when using the device to control the position of the MPPC. It is also possible to implement the device with one indicator device, for example, only with an acoustic emitter.

Below will be described the operation of the device by the example of its use for posture control.

The position sensor 1 is fixed / for example, using a patch 6 / on a given section of the back / as a rule in the interscapular region / user. In this case, a change in the curvature of the controlled portion of its back causes the strain gauge 5 to deform on the elastic plate 4. After the device is turned on, a sinusoidal oscillation generator 7 generates an alternating voltage with a frequency fo applied to the measuring bridge circuit 8, one of whose arms includes a strain gauge 5 that changes its electrical resistance during deformation of the elastic plate 4 caused by a violation of posture. In the initial state, with the correct posture, the bridge 8 is balanced and the voltage on its diagonal has a minimum / perfectly-zero / value. To balance the bridge 8, manual adjustment can be applied by changing one of the resistances (not shown) in the bridge circuit 8. An alternating voltage from the diagonal of the bridge circuit 8 is amplified by an amplifier 9 and supplied to the envelope detector 10, which selects the low-frequency component of the signal that carries information about the current strain value strain gauge 5. In this case, the voltage from the generator 7 is supplied to the second input of the envelope detector 10, specifying the threshold level Uo corresponding to a given unacceptable violation of posture. IN ; depending on specific tasks, the threshold level can be adjusted by the user. With small deformations of the strain gauge 5, the voltage at the output of the envelope detector 10 (Fig. 3) does not exceed the threshold level Uo and the formation of an audible warning signal does not occur for the user. If the voltage at the output of the envelope detector 10 exceeds the threshold level Uo (unacceptable bending of the controlled portion of the back), the signals (logical 1) from the output of the threshold block 11 are sent to a single-shot 13 and an AND-NOT circuit 14 of the delay unit 12. The output signal of the one-shot 13 (logical 1) has a duration t3 equal to the time delay, which is classified as a permissible short-term change in posture (for example, 2-3 s). Thus, at the output of circuit 14 AND-NOT, an output signal (logical 1) is generated only when signals are fed to its inputs: logical 1 from the threshold block 11 and logical O from the one-shot 13. In this case, a logical signal is generated at the output of the delay block 12 1 duration (That-t3), when That t3 and O, if That t3, where That is the duration of the signal at the output of the threshold unit 11. From the outputs of the delay unit 12 and the envelope detector 10, the signals are fed to the inputs of the modulator 15, to the third input of which generator output voltage 16 sine to fluctuations with a frequency of fl. At the same time, at the output of the modulator 15 there are packs of sinusoidal oscillations of duration (Tot3), the envelope of which carries information about the amount of deformation at the sensor installation site (level of posture disturbance). From the output of the modulator 15, the signal is fed to the first input of the electronic unit 17 of the detector 3, the second input of which is supplied with voltage

from the output of the envelope detector 10. The electronic unit 17 performs the function of pairing the signals of the electronic unit 2 with the indicators: an acoustic emitter 18 and a light indicator 19. At the same time, the acoustic emitter 18 gives a warning signal to the user about an unacceptable violation of posture, with information on the level of the sound signal about the amount of bending of the controlled portion of the back and the light indicator 19 represents information, in real time, about any bends of the controlled portion of the back, including the magnitude and duration of which do not exceed Invalid values specified. For the convenience of the user, the indicator light scale can be equipped with control marks corresponding to an unacceptable change in posture.

Sound (warning signal gives the user information about his wrong position and corrects his posture. Straightening of the back to which the position sensor is attached leads to straightening of the strain gauge and to a decrease in its electrical resistance, the result of which is a decrease in the signal supplied to the threshold device , and the shutdown of the alarm.

In other embodiments, the implementation and use of the proposed device, in principle, is similar to the above. For example, in the absence of a threshold block and a delay block, the signal from the envelope detector will be sent directly to the signaling device to generate a warning signal, the presentation form of which depends on the specific purpose of the device. The small dimensions of the position sensor 1, its flat shape, the absence of protruding elements make it possible to mask the sensor 1 under clothes, thereby providing the possibility of the device in various conditions. The prostate of the design of the position sensor 1, the absence of lockable openable electrical contacts, the proportional principle of its bots simplifies the operation of the proposed device and expands its functional capabilities.

Claims (3)

1. A device for monitoring the position of the musculoskeletal system of a person, comprising a position sensor configured to be fixed on the user and connected via an electronic assembly to a signaling device that generates a warning signal, characterized in that the position sensor is made in the form of a strain gauge mounted on an elastic plate.  2. The device according to claims 1 and 2, characterized in that the electronic node contains a connected threshold unit and a delay unit.  3. The device according to claim 1, characterized in that the length of the elastic plate is selected in the range of 50 - 100 mm