CN220369981U

CN220369981U - Balance evaluation device

Info

Publication number: CN220369981U
Application number: CN202220622549.4U
Authority: CN
Inventors: 谢飞; 陈永耀; 周雄
Original assignee: Suzhou Minimally Invasive Rehabilitation Medical Technology Group Co ltd
Current assignee: Suzhou Minimally Invasive Rehabilitation Medical Technology Group Co ltd
Priority date: 2022-03-21
Filing date: 2022-03-21
Publication date: 2024-01-23
Anticipated expiration: 2032-03-21

Abstract

The utility model provides a balance evaluation device and a balance evaluation system. The corresponding pressure sensors are arranged on the two opposite sides of the back of the supporting plate, signals acquired by the pressure sensors are automatically processed through the signal amplifying circuit, the potentiometer, the microcontroller and the like, so that the size and weight miniaturization of products and the simplification of product operation can be facilitated, the carrying and the transportation are facilitated, and the use requirements are reduced. Furthermore, each pressure sensor adopts the structural design that the strain gauge is arranged on the elastic body, so that the number of the pressure sensors is reduced on the premise of not reducing the performance index of the product, the equipment cost and the equipment volume are further reduced, and the portable pressure sensor is convenient to carry.

Description

Balance evaluation device

Technical Field

The utility model relates to the technical field of balance dysfunction assessment, in particular to a balance assessment device and a balance assessment system.

Background

Balance function is an important function and basic motor skills of human beings, and various actions in daily life depend on effective balance function. Many diseases can cause balance disorders, severely affecting the quality of life of the patient. Such as infantile cerebral palsy, spinal cord injury, central nervous system diseases, vestibular injury, etc., all affect balance function. According to the present clinical and scientific researches, the rehabilitation training and evaluation on the patients with limb movement balance dysfunction in time can recover and prevent part of limb movement balance dysfunction of the patients, improve the life self-care ability of the patients and reduce the disability rate.

Currently, the clinical balance evaluation is divided into a static balance evaluation, a dynamic balance evaluation and a scale form. The static balance assessment is the balance function assessment of the patient in sitting, standing or lying and other static states; dynamic balance assessment is an assessment of the balance of a patient during voluntary exercise or rehabilitation training, etc. The balance evaluation can effectively know the reason of the balance dysfunction caused by the patient and how the training effect after the balance rehabilitation training is achieved, so that the balance training scheme is changed to improve the rehabilitation efficiency. The old people can fall down due to the falling of the balance function, and according to statistics, the old people fall down at least once every year in China, the falling is the primary cause of death of the old people over 65 years old, and the falling rate and the falling death rate of the old people rise sharply along with the increase of the age, so that the balance function of the old people is evaluated and screened rapidly, early and accurately, and timely intervention is particularly important.

Currently, for balance assessment, the disadvantages of the static assessment system used in the existing balance dysfunction assessment include that the equipment is relatively large in size and weight, inconvenient to carry and transport, complicated in product and special site in the use process, and abundant operation experience is required to obtain accurate assessment data.

This also makes the balance evaluation performed by means of traditional manual recording and manual calculation, restricts the development of the technology, and lacks a set of automatic and efficient evaluation technical devices.

Disclosure of Invention

The utility model aims to provide a balance evaluation device and a balance evaluation system, which can solve one or more technical problems in the prior art.

To achieve the above object, the present utility model provides a balance evaluating apparatus comprising:

a support plate, the front face of the support plate being for supporting a patient;

at least two pressure sensors disposed on opposite sides of the support plate;

the signal amplifying circuit is electrically connected with each pressure sensor and is used for collecting and amplifying the resistance variable of the strain gauge in each pressure sensor so as to output corresponding analog signals;

the potentiometer is coupled with the signal amplifying circuit and is used for adjusting the amplification factor of the signal amplifying circuit, and the amplification factor is related to the weight on the supporting plate;

and the microcontroller is coupled with the potentiometer and the signal amplifying circuit, is used for controlling the amplification factor of the potentiometer, and processes the analog signal to at least obtain gravity center track data.

Optionally, each of the pressure sensors includes:

the elastic body is provided with a front surface and a back surface which are oppositely arranged, the front surface of the elastic body is fixedly connected with one side of the supporting plate, the back surface of the elastic body is provided with a foot margin, the foot margin is used for preventing the elastic body and the supporting plate from contacting the ground, and the elastic body is deformed by the stress of the corresponding position on the supporting plate;

the strain gauges are respectively arranged on the front surface and the back surface of the elastic body, and deformation of the elastic body can drive each strain gauge to deform, so that resistance values of the strain gauges are changed.

Optionally, at least one of the strain gages is located only on the front or back of the elastomer, or at least one of the strain gages is located around the elastomer.

Optionally, the central area of the back of the elastomer is provided with at least one strain gauge which is only positioned on the back of the elastomer, and the two end areas of the elastomer are respectively provided with at least one strain gauge which surrounds the periphery of the elastomer.

Optionally, each of said strain gages located only on the back side of said elastomer is located in an elastomer region lower than its surrounding elastomer region.

Optionally, the supporting plate is a complete flat plate; or, the supporting plate comprises a plurality of splice plates, a splice joint is arranged between every two adjacent splice plates, and the same side of each splice plate is fixed on the same pressure sensor.

Optionally, the supporting plate comprises a plurality of splice plates, and the elastic body is provided with at least one strain gauge positioned on the front surface of the elastic body and at least one strain gauge positioned on the back surface of the elastic body corresponding to each splice plate.

Optionally, a frame is further arranged on the back surface of the supporting plate, and the frame is buckled on the elastic body.

Optionally, the system further comprises an analog-to-digital converter, wherein the analog-to-digital converter is coupled to the signal amplifying circuit and is used for converting an analog signal output by the signal amplifying circuit into a digital signal, and the microcontroller is used for processing the digital signal output by the analog-to-digital converter to at least obtain the gravity center track data.

Optionally, the signal amplifying circuit comprises an analog amplifying chip, a pressure sensor connecting interface and a voltage dividing circuit, wherein the pressure sensor connecting interface and the voltage dividing circuit are respectively connected with the analog amplifying chip, and the voltage dividing circuit is connected with the potentiometer.

Based on the same inventive concept, the present utility model also provides a balance evaluation system, comprising:

at least one balance assessment device according to the utility model;

and the upper computer is in communication connection with the microcontrollers of the balance evaluation devices and is used for obtaining corresponding balance evaluation reference data according to the gravity center track data.

Optionally, the plurality of balance evaluation devices are arranged into a test array according to a preset arrangement rule.

Optionally, the microcontroller is configured to process the digital signal output by the analog-to-digital converter to obtain real-time gravity center trajectory data; and/or the number of the groups of groups,

the upper computer or the microcontroller is used for calculating the difference value of adjacent barycentric coordinate data in the real-time barycentric track data, and calculating each dimension parameter of the patient when the barycenter moves on the supporting plate according to the difference value.

Optionally, the upper computer is further configured to apply the real-time gravity center trajectory data or the dimensional parameters to an evaluation method algorithm model to obtain corresponding balance evaluation reference data, where the evaluation method algorithm model includes at least one of multiple test models used in a stability limit test, a walking test, an improved sensory interaction balance test, a front stride test, and a single foot standing test, and a control interface used for selecting a corresponding test model from the multiple test models is provided in the upper computer.

Optionally, the upper computer is further provided with a database and an evaluation report module, wherein the database is used for storing the real-time gravity center track data and the balance evaluation reference data, and the evaluation report module is used for generating a corresponding evaluation report according to the balance evaluation reference data.

Compared with the prior art, the technical scheme of the utility model has at least one of the following beneficial effects:

1. according to the balance evaluation device, the corresponding pressure sensors are arranged on the two opposite sides of the back of the supporting plate, signals acquired by the pressure sensors are automatically processed through the signal amplifying circuit, the potentiometer, the microcontroller and the like, so that the size and weight miniaturization of products and the simplification of product operation can be facilitated, the carrying and the transportation are facilitated, and the use requirements are reduced.

2. The pressure sensors of the balance evaluation device adopt the structural design that the strain gauge is arranged on the elastic body, so that the number of the pressure sensors is reduced, the equipment cost and the equipment volume are further reduced, and the balance evaluation device is convenient to carry compared with the existing balance evaluation equipment adopting matrix film-covered pressure sensors on the premise that the performance index of a product is not reduced.

3. The pressure sensors in the balance evaluation device are provided with the strain gauges on the front and back surfaces of the elastic body, so that the temperature drift of the pressure sensors is reduced, the error of the strain gauges is counteracted, the accuracy of sampling data is improved, and the problems of low accuracy of the position coordinate parameters of the weight center of a person and obvious difference of the sampling data in the existing balance evaluation system are solved.

4. The microcontroller of the balance evaluation device can be in communication connection with the upper computer, so that the problems that the existing balance evaluation system method and algorithm model are too single and the evaluation result accuracy is poor can be solved by further combining a plurality of balance evaluation devices and setting a plurality of balance evaluation algorithm models in the upper computer.

5. The method can further calculate the difference value of the real-time adjacent coordinate data in the real-time gravity center track data in the upper computer, and calculate each dimension parameter of the patient when the gravity center moves on the supporting plate according to the difference value, so that the problems that the data amount for calculation in the existing balance evaluation system is small and the accuracy of the calculation result is low are solved.

6. The control interface for selecting the corresponding test model from the plurality of test models and the evaluation report module for outputting the evaluation report are directly provided in the upper computer, so that the problems that the existing balance evaluation system is complex in operation and the evaluation result is not easy to read are solved.

7. And setting a corresponding database in the upper computer to store corresponding data, thereby solving the problems that the prior balance evaluation system has small data collection amount and original collected data is not stored.

Drawings

Fig. 1 is a schematic structural diagram of a balance evaluation device according to an embodiment of the utility model.

Fig. 2 is a schematic view of the back structure of the pressure sensor in the balance evaluating apparatus shown in fig. 1.

Fig. 3 is a schematic view showing a back structure of a pressure sensor in a balance evaluating apparatus according to another embodiment of the present utility model.

Fig. 4 is a schematic view of the back structure of the pressure sensor shown in fig. 3.

Fig. 5 is a schematic diagram of a signal amplifying circuit in a balance evaluation device according to an embodiment of the present utility model.

Fig. 6 is a schematic diagram of a signal amplifying circuit in a balance evaluation device according to an embodiment of the present utility model.

FIG. 7 is a schematic diagram of a balance evaluation system according to an embodiment of the present utility model.

FIG. 8 is a schematic diagram of a balance evaluation system according to another embodiment of the present utility model.

Fig. 9 is a schematic diagram of the dimensional parameters of the patient when the center of gravity of the patient is shifted, which is obtained by the balance evaluation device according to an embodiment of the present utility model.

Detailed Description

In the following description, numerous specific details are set forth in order to provide a more thorough understanding of the present utility model. It will be apparent, however, to one skilled in the art that the utility model may be practiced without one or more of these details. In other instances, well-known features have not been described in detail in order to avoid obscuring the utility model. It should be understood that the present utility model may be embodied in various forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the utility model to those skilled in the art. Like numbers refer to like elements throughout. It will be understood that when an element is referred to as being "connected," "coupled" to another element, it can be directly connected to the other element or intervening elements may be present. In contrast, when an element is referred to as being "directly connected to" another element, there are no intervening elements present. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and/or "comprising," when used in this specification, specify the presence of stated features, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, steps, operations, elements, components, and/or groups. As used herein, the term "and/or" includes any and all combinations of the associated listed items.

The technical scheme provided by the utility model is further described in detail below with reference to the attached drawings and specific embodiments. The advantages and features of the present utility model will become more apparent from the following description. It should be noted that the drawings are in a very simplified form and are all to a non-precise scale, merely for convenience and clarity in aiding in the description of embodiments of the utility model.

Referring to fig. 1-5, an embodiment of the present utility model provides a balance evaluation device (may also be referred to as a "balance evaluation board") that includes a support plate, at least two pressure sensors, a signal amplifying circuit 30, a potentiometer 40, and a microcontroller 60. The signal amplifying circuit 30 is electrically connected with each pressure sensor and is used for collecting and amplifying the resistance change of the strain gauge in each pressure sensor so as to output corresponding analog signals; a potentiometer 40 coupled to the signal amplification circuit, the potentiometer being configured to adjust a magnification of the signal amplification circuit, the magnitude of the magnification being related to the magnitude of the weight on the support plate; and a microcontroller 60 coupled to the potentiometer and the signal amplification circuit, the microcontroller being configured to control the amplification of the potentiometer, and the microcontroller processing the analog signal to obtain at least center of gravity trajectory data.

In some embodiments, the analog-to-digital converter 50 is further included, referring to fig. 1-5, the analog-to-digital converter 50 is coupled to the signal amplifying circuit 30 and is configured to convert the analog signal output by the signal amplifying circuit 30 into a digital signal; the microcontroller 60 is configured to process the digital signal output from the analog-to-digital converter 50 to obtain at least center of gravity trajectory data.

Referring to fig. 1 and 2, in this embodiment, the support plate of the balance evaluation device includes two splice plates 21, 22, two pressure sensors S1, S2 are disposed on opposite sides of the support plate, and a splice joint is disposed between the splice plates 21, 22, the splice plates 21, 22 are disposed in one-to-one correspondence with the left and right feet, wherein the two splice plates 21, 22 are rectangular plates, the same side broadsides of the two splice plates 21, 22 are simultaneously fixed on the pressure sensor S1, and the other side broadsides of the two splice plates 21, 22 are simultaneously fixed on the pressure sensor S2, at this time, the elastic bodies of the two pressure sensors S1, S2 are disposed in parallel and the length extending directions of the two splice plates are perpendicular to the length extending directions of the splice joint, so that the pressure sensors S1, S2 realize the splicing and fixing of the two splice plates 21, 22. The front faces of the splice plates 21, 22 are both placed horizontally and flush in a natural state, i.e., when no balance evaluation test is performed, the front faces of the splice plates 21, 22 are both placed horizontally and flush. In the balance evaluation test, one foot (for example, left foot) of the patient stands on the splice plate 21, the other foot (for example, right foot) stands on the splice plate 22, and the pressure sensors S1 and S2 sense the pressures generated by the left and right feet of the patient standing on the support plate, generate corresponding analog signals (for example, the resistance change amount of the strain gauge of the pressure sensor), and further obtain the unbalanced state of the patient after the processing by the signal amplifying circuit 30, the analog-digital converter 40, the microcontroller 50, and the like.

Referring to fig. 1 and 2 with emphasis, each of the pressure sensors S1/S2 of the present embodiment includes an elastic body E1 and four strain gauges S11 to S14.

The elastic body E1 may be made of a material having both rigidity and elasticity, such as metal, so that on one hand, the elastic body E1 has enough rigidity, and when any position on the front surface of the support plate (i.e., the splice plates 21 and 22) to which the elastic body E1 is connected is stressed, the elastic body E1 can avoid contacting the ground, and further can ensure that the support plate (i.e., the splice plates 21 and 22) is kept away from the ground, so as to avoid the problem of inaccurate test results; on the other hand, the elastic body E1 has enough elasticity, and when any position on the front surface of the support plate (i.e. the splice plates 21, 22) to which the elastic body E1 is connected is stressed, the elastic body E1 can generate corresponding deformation and can drive the strain gauges S11 to S14 to deform, so as to generate corresponding resistance change.

In this embodiment, the elastic body E1 has a front face E11 and a back face E12 disposed opposite to each other, and four screw fixing holes FV1 to FV4 and two anchor holes GV1 to GV2 are provided on the elastic body E1. The ground anchor holes GV1 to GV2 are respectively positioned at two ends of the elastic body E1, and the thread fixing holes FV1 to FV4 are uniformly distributed on the elastic body E1 between the ground anchor holes GV1 to GV2.

The threaded fixing holes FV 1-FV 4 are used for installing corresponding screws to realize the fixed connection of the elastic body E1 and the supporting plates (i.e., splice plates 21, 22). The thread fixing holes FV 1-FV 4 all penetrate from the back face E12 of the elastic body E1 to the front face E11 of the elastic body E1, each thread fixing hole is divided into two sections from the back face E12 to the front face E11, the first section is a fixing hole FV11 which is arranged on the back face E12 and used for placing and stopping a screw cap, the depth of the fixing hole FV11 is such that the screw cap does not protrude out of the back face E12 of the elastic body E1 after the screw is installed, the second section is a threaded hole FV12 which is communicated with the fixing hole FV11 and penetrates to the front face E11, threads are arranged on the inner wall of the threaded hole FV12, and the aperture of the threaded hole FV12 is smaller than that of the fixing hole FV 11. For example, the screw fixing holes FV1 to FV2 can fix one side of the splice plate 22 to the elastic body E1 after the screw is installed, and the screw fixing holes FV3 to FV4 can fix one side of the splice plate 21 to the elastic body E1 after the screw is installed. In addition, the thread fixing holes FV1 to FV4 are uniformly distributed on the elastic body E1 between the anchor holes GV1 to GV2, so that the fixing stress distribution of the splice plates 21, 22 is uniform, which is advantageous for improving the sensing accuracy of the pressure sensor.

The ground anchor holes GV1 to GV2 each extend from the front face E11 of the elastic body E1 to the rear face E12 of the elastic body E1 and are used for installing corresponding ground anchors in a one-to-one manner, such as G1 and G2 in fig. 1, the ground anchors G1 to G2 are installed on the rear face E12 of the elastic body E1, 4 ground anchors G1 to G4 are installed on the rear faces of the two pressure sensors S1 and S2 together, the 4 ground anchors G1 to G4 are located at four corner positions of the support plate, and in a natural state, the combined action of the 4 ground anchors G1 to G4 enables the front faces of the splice plates 21 and 22 to be horizontally placed and enables the elastic bodies E1 of the two pressure sensors S1 and S2 and the splice plates 21 and 22 connected thereto to be placed flush, thereby causing the elastic bodies E1 of the two pressure sensors S1 and S2 to be correspondingly deformed when the corresponding positions are stressed on the splice plates 21 and 22, thereby causing the resistance values of the stress plates S11 to be changed.

In this embodiment, four strain gauges S11 to S14 on each elastic body E1 are respectively disposed on the front face E11 and the back face E12 of the elastic body E1, and the front face E11 and the back face E12 of the elastic body E1 are respectively provided with a structure of strain gauges, which is favorable for reducing temperature drift of the pressure sensor and counteracting errors of the strain gauges, thereby improving sampling data accuracy.

In this embodiment, the strain gauges S11 and S12 are disposed at two ends of the elastic body E1, the strain gauge S11 is located between the ground hole GV1 and the screw fixing hole FV1, the strain gauge S12 is located between the ground hole GV2 and the screw fixing hole FV4, and the strain gauges S11 and S12 are disposed around the elastic body E1, so that the strain gauges S11 and S12 can extend from the front surface E11 of the elastic body E1 to the back surface E12 of the elastic body E1. The strain gauges S13 and S14 are disposed in a central region of the elastic body E1, and the strain gauges S13 and S14 are located between the screw fixing holes FV2, FV3, the strain gages S13 and S14 are each provided on the back face E12 of the elastic body E1, for example, the strain gages S13 and S14 are each provided only on the back face E12 of the elastic body E1 by attaching.

Optionally, in order to further enhance the bonding reliability of the support plate and the elastic body E1, a frame 23 is provided on the back of each of the splice plates 21, 22, and the frame 23 can be snapped onto the elastic body E1. The frame 23 may be an annular frame structure, or may be a strip-shaped plate structure that can function as a reinforcing rib.

Optionally, in order to enhance the elasticity of the elastic body E1, a sufficient deformation space is provided for the strain gages S13 and S14 on the back surface of the elastic body E1, and the strain gages S13 and S14 on the back surface of the elastic body E1 are prevented from contacting the ground when the elastic body E1 is deformed to the maximum, the mounting positions of the strain gages S13 and S14 are further provided with a recess E15, and the strain gages S13 and S14 are disposed in the recess E15, whereby the back surfaces of the strain gages S13 and S14 are still lower than the back surfaces of the surrounding elastic body E1 region after being mounted at the recess E15.

Optionally, in order to further enhance the elasticity of the elastic body E1 and to enhance the deformation sensitivity of the strain gages S13 and S14, a concave portion E14 is provided on the front surface of the elastic body E1 corresponding to the concave portion E15 (the concave portion E14 and the concave portion E15 are provided back to back), and the depth of the concave portion E14 is similar to or substantially the same as the depth of the concave portion E15, thereby symmetrically tapering the front and back surfaces of the elastic body E1 where the strain gages S13 and S14 are located.

Alternatively, in order to provide the required deformation space for the strain gages S11 and S12 on both ends of the elastic body E1, the front faces E11 of the mounting positions of the strain gages S11 and S12 are also provided with concave portions E13, respectively, whereby the front faces of the strain gages S11 and S12 after being mounted in the concave portions E13 are made lower than the front faces of the surrounding elastic body E1 regions.

Alternatively, in order to enhance the elasticity on both ends of the elastic body E1, the deformation sensitivity of the strain gages S11 and S12 is improved, the through-hole PV1 is provided between the anchor hole GV1 and the strain gages S11, the through-hole PV2 is provided between the anchor hole GV2 and the strain gages S12, and the penetrating direction of the through-holes PV1 and PV2 is perpendicular to the penetrating direction of the anchor hole GV 1.

It should be understood that the structures of the support plate and the pressure sensor in the balance evaluating apparatus of the present embodiment are merely taken as a specific example, and do not represent that the structures of the support plate and the pressure sensor in the balance evaluating apparatus of the present utility model are limited to the above examples only. In other embodiments of the utility model, the structure of the support plate, pressure sensor, may be specifically set as required by the method of balance evaluation. For example, for evaluation methods such as single-foot standing test or double-foot standing test, the support plate of the balance evaluation device may be a piece of seamless integrally formed flat plate, with two pressure sensors disposed on opposite sides of the support plate; for another example, for the walking test evaluation method, the supporting plate of the balance evaluation device can comprise not less than 3 splice plates, the number of the pressure sensors can be set according to the total length of one side of the supporting plate, the two adjacent splice plates are provided with splice joints, one side of each adjacent splice plate is simultaneously fixed on the same pressure sensor, the other side of each adjacent splice plate is simultaneously fixed on the other same pressure sensor, namely, the splice plates can be spliced and fixed under the combined action of the pressure sensors, and the front surfaces of the splice plates are horizontally placed and flush in a natural state. For another example, referring to fig. 3 and 4, the strain gauges S1 and S2 at both ends of the elastic body E1 are only disposed on the front face E11 of the elastic body E1 by attaching. For example, more than two strain gages may be provided on the front face of a pressure sensor, which may or may not be uniformly distributed; more than two strain gages are arranged on the back of one pressure sensor, and the strain gages can be uniformly distributed or unevenly distributed. The strain gage may have the same size (e.g., width) or different sizes, and may have the same shape or different shapes.

In some embodiments, the support plate comprises a plurality of splice plates, the elastic body is provided with at least one strain gauge positioned on the front surface of the elastic body and at least one strain gauge positioned on the back surface of the elastic body corresponding to each splice plate, as shown in fig. 2, the strain gauges S11 and S13 are positioned on the same side of the same splice plate, and then the strain gauges S11 and S13 are preferably positioned on the front surface and the back surface of the elastic body respectively, so that each splice plate can monitor the force applied by a patient to the elastic body, and the shearing force can be better monitored by the positioning on the front surface and the back surface of the elastic body, thereby facilitating the formation of gravity center track data.

Referring to fig. 4 and 5, the balance evaluation device of the present embodiment further includes a potentiometer 40, the potentiometer 40 is coupled to the signal amplification circuit 30 and the microcontroller 60, the potentiometer 40 is used for adjusting the amplification factor of the signal amplification circuit 30 under the control of the microcontroller 60, and the amplification factor is related to the weight of the patient supported on the support plate of the balance evaluation device. The potentiometer 40 may be an analog potentiometer (e.g., a variable resistor RW 1) or a digital potentiometer.

Referring to fig. 6, the signal amplifying circuit 30 of the present embodiment includes an input filter circuit, a module amplifying chip U1, a pressure sensor connection interface SIG4-/sig4+, a voltage dividing circuit, and an output filter circuit. The input filter circuit is coupled between the analog amplifying chip U1 and the corresponding pressure sensor connection interface SIG4-/sig4+, the output filter circuit is coupled between the output terminal VOUT of the analog amplifying chip U1 and the analog-to-digital converter 50, and the voltage dividing circuit is connected to the potentiometer 40.

As an example, the input filter circuit includes a resistor R2, a resistor R4, a capacitor C2, a capacitor C3, and a capacitor C5. One end of the resistor R2 is connected with the pressure sensor connection interface SIG4-, the other end of the resistor R2 is connected with one end of the capacitor C2 and one end of the capacitor C3, one end of the resistor R4 is connected with the pressure sensor connection interface SIG4+, the other end of the resistor R4 is connected with one end of the capacitor C5 and the other end of the capacitor C3, the other end of the capacitor C2 and the other end of the capacitor C5 are grounded, and the input filter circuit is used for filtering resistance value variation signals acquired from the strain gauge.

As an example, the output filter circuit includes a resistor R1 and a capacitor C1. One end of the resistor R1 is connected with the output end VOUT of the analog amplifying chip U1, the other end of the resistor R1 is connected with one end of the capacitor C1, the other end of the capacitor C1 is grounded, and the output filter circuit is used for filtering analog signals output by the output end VOUT of the analog amplifying chip U1.

As an example, the voltage dividing circuit includes a resistor R3 and a resistor R5, one end of the resistor R3 is connected to a signal gain end RG of the analog amplifying chip U1, one end of the resistor R5 is connected to another signal gain end RG of the analog amplifying chip U1, the other end of the resistor R3 is connected to the other end of the resistor R5, and the potentiometer 40 is connected in parallel to two ends of the resistor R5, so that the overall resistance of the circuit formed by the voltage dividing circuit and the potentiometer 40 is adjusted by the size of the resistor connected to the potentiometer 40, and then the currents of the two signal gain ends RG are adjusted, so that the amplification factor of the analog signal output by the output end VOUT of the analog amplifying chip U1 is changed.

The working principle of the balance evaluation device of the present embodiment is as follows:

firstly, the weight of a patient is supported by a supporting plate (i.e. a splice plate) of the balance evaluation device of the embodiment, wherein the pressure sensors S1 and S2 sense the stress at each position on the supporting plate, and the strain gauge thereof generates corresponding deformation to generate resistance change;

then, the signal amplifying circuit 30 collects the weight of the patient supported by the support plate and the resistance change of the strain gauges in the pressure sensors S1 and S2 connected with the support plate to obtain corresponding weight and analog signals;

then, the microcontroller 50 determines the amplification factors of the signal amplification circuit 30 according to the weight of the patient, different weights adopt different amplification factors, and the signal amplification circuit 30 amplifies the analog signal by corresponding amplification factors and outputs the amplified analog signal to the analog converter 50;

the amplified analog signal is then converted by the analog converter 50 into a digital signal, which is processed by the microcontroller 50 to obtain real-time barycentric trajectory data of the patient on the support plate. The microcontroller 50 may further calculate the difference between adjacent coordinate values in the real-time gravity center trajectory data, and calculate the dimensional parameters of the patient when the gravity center of the patient moves, such as "response time", "moving speed", "direction control", "first time the COG (human body gravity center) reaches the farthest distance", "the COG can reach the farthest distance after multiple times of attempts", etc., as shown in fig. 9, where P1 is a standing position of the human body, T1 is 8 target positions obtained by rotating the human body at an angle of 45 ° with respect to the center of the human body, and TR1 is a movement trajectory of moving the gravity center of the human body when the human body gravity center is not in motion.

Finally, the microcontroller 60 may upload the relevant data and calculation results to an external host computer (i.e., PC) via a USB interface, an ethernet interface, a wireless communication interface, or other serial ports, etc., for the doctor to perform balance evaluation on the patient.

Therefore, referring to fig. 7, the present embodiment further provides a balance evaluation system, which includes a host computer 70 and a balance evaluation device of the present utility model communicatively connected to the host computer 70. The upper computer 70 is configured to perform quantization data conversion on the real-time barycentric trajectory data obtained by the microcontroller 60 by using different algorithm models of the evaluation method to obtain corresponding balance evaluation reference data, so that a doctor can determine whether the obtained balance evaluation reference data is abnormal by combining a corresponding parameter normal value range, each parameter abnormality represents a cause affecting the balance function, and then the doctor can perform targeted exercise on the patient by combining the causes evaluated by the balance function to improve the body balance function of the patient.

The upper computer 70 may select different evaluation method algorithm models according to different patients, and the evaluation method algorithm models may include, for example, multiple test models for a stability limit test (LOS) 71, a walk test (WA) 72, a modified sensory interaction balance test (Mctsib) 73, a pre-stride test (FL) 74, and a single-foot standing test (US) 75, and a control interface for selecting a corresponding test model from the test models is provided in the upper computer 70.

In addition, the data required for the various evaluation method algorithm models may be derived from real-time center of gravity trajectory data obtained by the microcontroller 60 of each balance evaluation device. The upper computer 70 of the present embodiment has a database 76 that can store real-time centroid trace data, various evaluation algorithm models, the obtained balance evaluation reference data, and normal value ranges of the respective dimensional parameters.

In practical applications, different evaluation method algorithm models (i.e., different evaluation methods are implemented) can be selected on the upper computer 70 according to different patients to perform balance evaluation. The test corresponding to each evaluation method is also different, and the parameters of the evaluation method algorithm model corresponding to the evaluation method for quantization are also different. For example, the stability limit test method obtains the equivalent parameters of "reaction time", "moving speed", "direction control", "first try COG (center of gravity of human body) to reach the farthest distance", "COG can reach the farthest distance after multiple attempts", and the improved sensory interaction balance test method obtains the envelope area parameters of human body shaking track when the human body stands on hard and soft objects to open and close eyes. After selecting the corresponding evaluation method algorithm model, the upper computer 70 can obtain the corresponding quantitative balance evaluation parameter, so that the doctor can find out the abnormal parameter by comparing the quantitative balance evaluation parameter with the normal value range of the parameter, find out the cause affecting the balance function, and further carry out the treatment scheme of targeted exercise on the patient.

Therefore, the system improves the problems of single evaluation method and poor accuracy of evaluation results of the traditional balance evaluation system, so as to improve the problem of single quantifiable parameter of the traditional balance evaluation system, and can provide multidimensional parameters for evaluating balance dysfunction on each evaluation method.

Optionally, the microcontroller 60 or the upper computer 70 can further calculate the difference between the adjacent barycentric coordinate data in the real-time barycentric trajectory data, and calculate each dimension parameter when the barycenter of the patient moves on the support plate according to the difference; the upper computer 70 is configured to apply corresponding parameters in the dimensional parameters to corresponding evaluation algorithm models to obtain corresponding balance evaluation reference data.

In addition, since there are a static balance evaluation and a dynamic balance evaluation in clinical balance evaluation at present, and the static balance evaluation is a balance function evaluation of a patient in a sitting, standing or lying state, and the dynamic balance evaluation is a balance function evaluation of the patient in an autonomous exercise or rehabilitation training process, etc., the support plate area of one balance evaluation device is insufficient to achieve the support plate area required for the balance evaluation of the patient, please refer to fig. 8, n (n is greater than or equal to 2) balance evaluation devices are required to be combined, and these balance evaluation devices may be arranged according to the static or dynamic required area of the patient (i.e. these balance evaluation devices are arranged into a test array according to a preset arrangement rule), and all are connected to the upper computer 70 by the same connection method (for example, USB 3.0) and the like, so as to satisfy the requirement of the balance evaluation. At this time, the upper computer 70 may integrate the data transmitted from the balance evaluation devices to complete the most comprehensive balance evaluation effect. At this time, the balance evaluation devices in the balance evaluation system of the present utility model can be actually considered as a split type (or distributed type) device, and the balance evaluation devices are combined with each other and jointly achieve the purpose of performing balance evaluation on the patient with balance dysfunction caused by human sensory system-vestibule, vision, proprioception, central nervous system, etc. under the management of the same upper computer, thereby achieving the effects of portability, intelligence and high efficiency.

Optionally, for more convenient use of doctors and patients, an evaluation report module 77 is further provided in the upper computer 70, and the evaluation report module 77 is configured to generate a corresponding evaluation report according to the corresponding balance evaluation reference data and the normal value range of the corresponding parameters.

In addition, the data obtained after the corresponding signal processing by the upper computer 70 and the microcontroller 60 may include not only the barycentric trajectory data, but also pressure distribution data (e.g., a specific value of the pressure generated by the left foot and a specific value of the pressure generated by the right foot) on the support plate, and so on.

In summary, compared with the traditional balance evaluation system, the balance evaluation device and the balance evaluation system provided by the utility model have smaller volume and weight, are suitable for portability, are convenient for clinical use, can reduce the number of pressure sensors on the premise of not reducing product performance indexes, reduce cost, and can improve a richer evaluation method by detecting the coordinate precision of the barycenter position of a human body, thereby being suitable for all scenes in which balance evaluation is required to be performed on balance dysfunction and senile tumbling risk prediction caused by human body sensory systems (including vestibule, vision, proprioception, central nervous system and the like) by adopting the pressure sensors.

The foregoing description is only illustrative of the preferred embodiments of the present utility model and is not intended to limit the scope of the present utility model in any way, and any alterations and modifications made by those skilled in the art in light of the above disclosure shall fall within the scope of the present utility model.

Claims

1. A balance evaluation apparatus, comprising:

at least two pressure sensors disposed on opposite sides of the support plate;

the microcontroller is coupled with the potentiometer and the signal amplifying circuit and is in communication connection with an upper computer outside the balance evaluation device, wherein the upper computer is provided with an evaluation method algorithm model;

wherein each of the pressure sensors includes:

the elastic body is provided with a front surface and a back surface which are oppositely arranged, the front surface of the elastic body is fixedly connected with one side of the supporting plate, the back surface of the elastic body is provided with a foot margin, the foot margin is used for preventing the elastic body and the supporting plate from contacting the ground, and the elastic body is deformed due to the stress on the supporting plate;

2. The balance assessment device of claim 1, wherein at least one strain gauge of the plurality of strain gauges is located only on the front or back of the elastomer, or wherein at least one strain gauge is disposed around the elastomer.

3. The balance evaluation device according to claim 2, wherein the back central region of the elastic body is provided with at least one of the strain gauges only on the back of the elastic body, and both end regions of the elastic body are respectively provided with at least one of the strain gauges around the circumference of the elastic body.

4. A balance assessment device according to claim 3, wherein each said strain gauge located only on the back side of said elastomer is located in an elastomer region lower than its surrounding elastomer region.

5. The balance assessment device of claim 1, wherein a rim is further provided on the back of the support plate, the rim being snapped onto the elastomer.

6. Balance assessment device according to any of claims 1-5, characterized in that said support plate is a complete plate; or, the supporting plate comprises a plurality of splice plates, a splice joint is arranged between every two adjacent splice plates, and the same side of each splice plate is fixed on the same pressure sensor.

7. The balance assessment device according to claim 6, wherein the support plate comprises a plurality of splice plates, and the elastic body is provided with at least one strain gage on the front surface of the elastic body and at least one strain gage on the back surface of the elastic body, corresponding to each of the splice plates.

8. The balance assessment device of claim 1, further comprising an analog-to-digital converter coupled to the signal amplification circuit and configured to convert an analog signal output by the signal amplification circuit to a digital signal and output to the microcontroller.

9. The balance evaluation device according to claim 1, wherein the signal amplification circuit includes an analog amplification chip, and a pressure sensor connection interface and a voltage dividing circuit respectively connected to the analog amplification chip, the voltage dividing circuit being connected to the potentiometer.