CN103330546A - Embedment-based digital vibration perception threshold detector - Google Patents

Abstract

An embedded digital vibration sensory threshold detector, including microprocessor, memory, Flash memory, power management module, digital-to-analog conversion module, AC voltage regulation module, vibration generator, LCD touch screen, and control panel; Microprocessing The device controls the output of the digital-to-analog conversion module by reading the voltage set by the LCD touch screen, and then controls the output voltage of the AC voltage regulator module, so that the vibration generator generates vibrations of different amplitudes. A threshold signal is generated, and the threshold signal is sent to the microprocessor. When the measured part does not feel vibration, the output voltage of the flow regulator module is controlled through the control panel until the vibration is felt. The invention overcomes the disadvantage that the existing detection technology cannot measure quantitatively, and provides scientific and accurate vibration perception threshold data through instrumental measurement means.

Description

An Embedded Digital Vibration Sensation Threshold Detector

technical field

The invention relates to an instrument system for detecting sensory impairment, in particular to a vibration sensory impairment inspection instrument and system using a digitally modulated vibration amplitude method.

Background technique

Diabetic peripheral neuropathy (Diabetic Peripheral Neuropathy, DPN) has become a global health problem, how to quickly, quantitatively and accurately conduct early screening becomes the key. Due to the high concealment of DPN, it has become the main clinical method to check the sensory function of the subjects through instruments. At present, the commonly used inspection methods include 10g nylon wire inspection, 128Hz tuning fork inspection, etc., which rely on the pressure sense or vibration sense of the human skin to determine whether there is any obstacle in the sensory function of the subject. Because these methods are simple to operate and easy to implement, they have become clinical main means of inspection.

However, so far, the existing clinical detection methods also have some insurmountable shortcomings: large errors introduced in human operation, easily interfered by the subject's subjective consciousness, unable to perform quantitative measurement, and difficult to provide in clinical monitoring. Strong basis for judgment.

Contents of the invention

The purpose of the present invention is to overcome the shortcomings of the existing detection technology that cannot be quantitatively measured, and provide scientific and accurate vibration perception threshold data through instrumental measurement means to improve the overall reliability of the detection system.

In order to achieve the above-mentioned purpose, the present invention adopts following technical scheme:

An embedded digital vibration sensory threshold detector, including microprocessor (1), memory (2), Flash memory (3), power management module (4), digital-to-analog conversion module (5), AC voltage regulator Module (7), vibration generator (8), LCD touch screen (9), and control panel (10); said memory (2) is used for running programs and data cache, and said Flash memory (3) is used for To store data, the power management module (4) is used to provide multiple output voltages to provide power for the microprocessor (1), memory (2), and Flash memory (3), and the LCD touch screen (9) is used to For receiving, displaying, setting the voltage and the parts to be tested; the LCD touch screen (9) is connected to the microprocessor (1), and the microprocessor (1) reads the voltage set through the LCD touch screen (9) and the parts to be tested, The digital-to-analog conversion module (5) is connected to the microprocessor (1), and the microprocessor (1) sends instructions to the digital-to-analog conversion module (5) to control the conversion of digital signals to analog signals; the AC voltage regulation module (7) is connected to the digital The analog conversion module (5) is connected, and the analog signal converted by the digital-to-analog conversion module (5) controls the AC voltage regulation module (7) to output a voltage equal to the set voltage; the vibration generator (8) and the AC voltage regulation module (7 ), the AC voltage modulated by the AC voltage regulating module (7) drives the vibration generator (8) to generate vibrations of different amplitudes; the contact probe is placed on the measured part; the control panel (10) is connected to the microprocessor (1), It is used to change the output voltage of the AC voltage regulating module (7), or to generate a threshold signal when the measured part feels vibration, and the threshold signal is sent to the microprocessor (1); the microprocessor (1) reads the LCD touch screen (9) The set voltage controls the output of the digital-to-analog conversion module (5), and then controls the output voltage of the AC voltage regulating module (7), so that the vibration generator (8) generates vibrations of different amplitudes. When the measured part feels When vibrating, a threshold signal is generated through the control panel (10), and the threshold signal is sent to the microprocessor (1). When the measured part does not feel vibration, the output voltage of the flow regulator module (7) is controlled through the control panel (10). until you feel a jolt.

The vibration generator (8) includes an L-shaped tough steel sheet, a flat-shaped tough steel sheet, a contact probe and an electromagnet, one end of the L-shaped tough steel sheet is fixedly connected to the electromagnet, and the other end is fixedly connected to a flat-shaped The tough steel sheet is parallel to the one-shaped tough steel sheet, the contact probe is vertically fixed on the one-shaped tough steel sheet, the contact probe is directly in contact with the measured part of the human body, and the AC voltage regulating module (7) outputs AC voltages of different sizes , through the electromagnet to absorb the one-shaped ductile steel sheet to make the contact probe vibrate.

A peripheral interface (6) is also provided, and the peripheral interface includes a serial port, an SD card interface, a USB interface and an LCD touch screen interface.

A system power interface is also provided for supplying power to the power management module (4), the peripheral interface (6), and the digital-to-analog conversion module (5).

The USB interface is used to connect a printer to output and print the detection result of the vibration sensation threshold.

Beneficial effect

Compared with prior art, the present invention has following advantage:

(1) The system adopts digital signal control to realize the adjustment of the vibration amplitude, which makes the measurement results more accurate, more accurate and more reliable.

(2) The system hardware platform adopts a multi-layer board design, using a high-performance processor as the control core, the system runs faster and has better stability.

(3) The system builds a layered application software system, which can effectively shield the differences of hardware platforms and is compatible with different hardware structures. The application software with visualization and touch operation is designed, which makes the operation of the instrument easier and more interactive, and facilitates the popularization and use of the instrument.

Description of drawings

Fig. 1 is a system structure diagram of the present invention;

Fig. 2 is a system work flowchart;

Fig. 3 is a structural schematic diagram of the vibration generator.

A, electromagnet, B, L-shaped tough steel sheet, C, straight-shaped tough steel sheet, D, contact probe.

Detailed ways

Based on the embedded digital vibration sensory threshold detector, according to its composition structure, the microprocessor uses the AM3354ARM microprocessor of Texas Instruments, the memory uses 2 pieces of MT47H256M8, the total memory capacity is 512M, the Flash uses 29F2G08ABAE, the storage capacity is 512M, and the power management module The TPS65910A of Texas Instruments is adopted, and the digital-to-analog conversion module uses Texas Instruments DAC7311 high-precision digital-to-analog conversion chip. Among them, the spi0_cs0 chip selection pin of the serial SPI0 road pin of the microprocessor AM3354 is connected to the chip selection pin SYNC of the digital-to-analog conversion chip DAC7311, and the serial synchronous clock pin spi0_sclk of the processor AM3354 is connected to the serial number of the digital-to-analog conversion chip DAC7311. The line synchronization clock pin sclk, the data output pin spi0_d0 pin of the processor AM3354 is connected to the data input pin Din of the digital-to-analog conversion chip DAC7311. The analog signal output pin Vout of the digital-to-analog conversion chip DAC7311 is connected to the analog control signal input pin of the AC voltage regulating module, and the output terminal of the AC voltage regulating module is connected to the electromagnet.

When the system is powered on and started, the vibration sensation threshold detection program is loaded into the memory to run. The user selects the part to be tested through the LCD touch screen to set a voltage value. After the processor reads the voltage value set through the LCD, it synchronizes The serial interface sends instructions to the digital-to-analog conversion chip DAC7311. After receiving the instructions, DAC7311 starts the digital-to-analog conversion, converts the digital signal into an analog control signal, and outputs it to the AC voltage regulation module. The AC voltage regulation module outputs under the control of the analog signal. The voltage value set by the user drives the vibration probe to generate vibration with corresponding amplitude. The digital-to-analog conversion accuracy is 12 bits, and the conversion formula from digital signal to analog signal is as follows:

${\mathrm{<span\; class="notranslate">\; V</span>}}_{\mathrm{<span\; class="notranslate">\; out</span>}}<span\; class="notranslate">\; =</span>\mathrm{<span\; class="notranslate">\; A</span>}{\mathrm{<span\; class="notranslate">\; V</span>}}_{\mathrm{<span\; class="notranslate">\; DD</span>}}<span\; class="notranslate">\; \&times;</span>\frac{\mathrm{<span\; class="notranslate">\; D.</span>}}{{\mathrm{<span\; class="notranslate">\; 2</span>}}^{\mathrm{<span\; class="notranslate">\; no</span>}}}$

Among them, n is the conversion precision, which is equal to 12 here; D is the binary command code, 12 bits in length; AV _DD is the reference voltage value, which is equal to 5V; V _OUT is the modulation output voltage value, and the range is 0-5V.

Referring to Figure 2, the system workflow is as follows:

(1) Eight commonly used detection parts are preset in the vibration threshold detection program, and the user selects the part to be tested through the LCD touch screen;

(2) The user sets the AC voltage value to be output by selecting the part to be tested. Here, for the convenience of operation, a default voltage is set corresponding to each part to be tested, and the value is sent to the processor ;

(3) After the processor reads the set voltage value, it sends an instruction to the digital-to-analog conversion module, which converts the digital signal into an analog control signal and outputs it to the AC voltage regulation module;

(4) The AC voltage regulating module outputs the set AC voltage value under the control of the analog control signal, drives the vibration probe and generates vibration with a specified amplitude;

(5) The human skin senses the vibration of the contact probe. According to the sensing situation, the size of the vibration can be adjusted through the plus and minus adjustment buttons, and the sensing is performed again until the vibration is sensed. The voltage value at this moment is the vibration perception threshold of the part. Usually, the same steps are repeated for 2-3 times, and the average value of the measurement results is taken as the result of the vibration sensation threshold of the measured part.

LCD can display the vibration perception threshold of the subject.

Attached Table 1 is a comparison table of the voltage, current and amplitude values of the 8 parts preset in the vibration sensory impairment detection program:

part name Display voltage (V) Actual output voltage (V) Actual output current (mA) Amplitude (uM) finger 2 2.00 4.40 2 base of big toe 3 2.94 6.43 2 front of torso 8 8.44 18.36 3 back of torso 7 7.53 16.36 3 calf side 10 10.28 22.36 4 Thigh L3 16 16.74 34.07 6 seventh cervical vertebra 17 17.67 34.80 8 upper arm 7 7.53 16.36 3

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements and improvements made within the principles and spirit of the present invention are all included in the protection of the present invention. within range.

Claims (5)

1. An embedded digital vibration sensory threshold detector, characterized in that it includes a microprocessor (1), a memory (2), a Flash memory (3), a power management module (4), a digital-to-analog conversion module ( 5), AC voltage regulating module (7), vibration generator (8), LCD touch screen (9), and control panel (10); said memory (2) is used for running programs and data cache, said Flash The memory (3) is used to store data, and the power management module (4) is used to provide various output voltages to provide power for the microprocessor (1), memory (2), and Flash memory (3), and the The LCD touch screen (9) is used to receive and display the set voltage and the parts to be tested; the LCD touch screen (9) is connected to the microprocessor (1), and the microprocessor (1) reads the voltage set through the LCD touch screen (9) As well as the parts to be inspected, the digital-to-analog conversion module (5) is connected to the microprocessor (1), and the microprocessor (1) sends instructions to the digital-to-analog conversion module (5) to control the conversion of digital signals to analog signals; the AC voltage regulation module (7) Connected with the digital-to-analog conversion module (5), the analog signal converted by the digital-to-analog conversion module (5) controls the AC voltage regulation module (7) to output a voltage equal to the set voltage; the vibration generator (8) is connected to the AC The voltage regulation module (7) is connected, and the AC voltage modulated by the AC voltage regulation module (7) drives the vibration generator (8) to generate vibrations of different amplitudes; the contact probe is placed on the measured part; the control panel (10) and the microprocessor (1) connected to change the output voltage of the AC voltage regulating module (7), or to generate a threshold signal when the measured part feels vibration, and the threshold signal is sent to the microprocessor (1); the microprocessor (1) By reading the voltage set by the LCD touch screen (9), the output of the digital-to-analog conversion module (5) is controlled, and then the output voltage of the AC voltage regulating module (7) is controlled, so that the vibration generator (8) generates vibrations of different amplitudes, When the measured part feels the vibration, the threshold signal is generated through the control panel (10), and the threshold signal is sent to the microprocessor (1), when the measured part does not feel the vibration, the flow regulator module is controlled through the control panel (10) ( 7) Output voltage until a shock is felt. 2. The digital vibration sensory threshold detector according to claim 1 is characterized in that: the vibration generator (8) includes a piece of L-shaped ductile steel sheet, a piece of in-line ductile steel sheet, a contact probe and an electromagnet One end of the L-shaped ductile steel sheet is fixedly connected to the electromagnet, and the other end is fixedly connected to the inline ductile steel sheet, which is parallel to the inline ductile steel sheet. The contact probe is vertically fixed to the inline ductile steel sheet, and the contact probe is directly connected to When the measured part of the human body is in contact, the AC voltage regulating module (7) outputs AC voltages of different sizes, and the inline tough steel sheet is adsorbed by the electromagnet to make the contact probe vibrate. 3. The digital vibration sensation threshold detector according to claim 1 is characterized in that: a peripheral interface (6) is also provided, and the peripheral interface includes a serial port, an SD card interface, a USB interface and an LCD touch screen interface. 4. The digital vibration sensation threshold detector according to claim 1 is characterized in that: a system power interface is also provided for supplying power to the power management module (4), the peripheral interface (6), and the digital-to-analog conversion module (5) . 5 . The digital vibration sensation threshold detector according to claim 3 , characterized in that: the USB interface is used to connect a printer to output and print the detection results of the vibration sensation threshold. 6 .

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