CN106166329A - Portable detector based on neuromuscular electric stimulation therapy instrument and method - Google Patents

Abstract

The invention provides a portable detection device based on a neuromuscular electrical stimulator, which includes a housing, a circuit board, a software system, and a touch screen. The housing includes: a main housing, a keycap, and a mounting fixture; the circuit board includes : Relay network, resistor network, signal conditioning circuit, CPU microcontroller and power module. Invented through the relay network automatic control, safety protection and conversion circuit, the load resistance switching of different resistance values of the resistance network, the signal conditioning circuit amplifies the signal and adds the signal zero point circuit, which improves the accuracy and stability of sampling, and makes the detected electric current The linear parameters and waveform accuracy are higher, the linearity error is reduced, and the structure is simple. It is widely used in the fields of medical device detection and industrial control.

Description

Portable detection device and method based on neuromuscular electrical stimulator

technical field

The invention relates to the field of precision instrument detection, in particular to a portable detection device and method based on a neuromuscular electrical stimulator.

Background technique

In medicine, neuromuscular electrical stimulators are commonly used to send out electrical pulse sequences to induce muscle movement, stimulate specific muscle groups to make them twitch or contract, and then achieve the technology of "functional" restoration. The size of the electric pulse output by the instrument is directly related to the effect of the treatment, and the stability of its electrical parameter output plays a vital role in the progress of the treatment. At present, the traditional electronic detection instruments have inaccurate readings, insufficient sensitivity and line The type error is relatively large, so it cannot be well applied to the electrical testing of precision instruments. Therefore, it is necessary to design a portable detection device and method based on a neuromuscular electrical stimulator.

Contents of the invention

The present invention provides a portable detection device and method based on a neuromuscular electrical stimulator to solve the problems of inaccurate readings, insensitive responses, and large linear error of current traditional electronic detectors, which cannot be well applied to the electrical properties of precision instruments. detection problems.

In order to achieve the above object, the present invention is achieved through the following technical solutions: a portable detection device based on a neuromuscular electrical stimulator, including a housing, a circuit board, a software system and a touch screen, and the housing includes: a main housing , button caps and mounting fixtures; the circuit board includes: a relay network, a resistor network, a signal conditioning circuit, a CPU single-chip microcomputer and a power supply module; wherein,

The CPU microcontroller is a 12-bit high-speed AD, and the 12-bit high-speed AD adopts SMT32F407VET6;

The relay network is connected with the resistance network for automatic control, safety protection and switching circuits;

The resistor network is connected with the signal conditioning circuit for generating the test signal;

The signal conditioning circuit is connected with the CPU single-chip microcomputer for amplifying the signal and processing AD sampling;

The power module is used to provide the power required by the system;

The touch screen is connected with the CPU single-chip microcomputer for displaying output signals and waveform diagrams.

Further, the relay network includes relays, and the relays use TQ2-L2-5V.

Further, the resistor network includes load resistors, and the load resistors are divided into 300Ω load resistors, 500Ω load resistors, 1000Ω load resistors, 2000Ω load resistors, 10KΩ load resistors and external extended 80Ω load resistors;

Further, the signal conditioning circuit includes an adjustable gain amplifier, which is used to amplify the signal by 1-128 times and adjust the zero point of the signal to 1.25V, and the adjustable gain amplifier adopts PGA280.

Further, the power module includes a lithium battery charging circuit, a 3.3V power supply, a 5V backlight and relay power supply, a ±5V analog circuit power supply, and a one-button switch circuit; wherein,

The lithium battery charging circuit includes a battery charging controller, and the controller adopts MCP73831T-2ATI/OT;

The 3.3V power supply includes an IC chip, and the IC chip adopts TPS62260DDC;

The 5V backlight and relay power supply includes an integrated switch, and the boost converter uses TPS61040;

The ±5V analog circuit power supply includes an integrated switch, and the integrated switch adopts TPS65133;

The one-button switch circuit includes a switch MOS tube and a one-way diode.

Further, a thin film transistor driving circuit is provided between the touch screen and the CPU microcontroller, and the touch screen adopts a 4.3-inch capacitive touch screen.

A portable detection method based on a neuromuscular electrical stimulator, said method comprising the steps of:

S1) Turn on the device first;

S2) The output terminals of the neuromuscular electrical stimulator are divided into positive and negative poles and respectively connected to the signal input terminals of the device;

S3) Select the channel and impedance on the device, and enter the test interface;

S4) After turning on the neuromuscular electrical stimulator, start the output for testing.

Further, the step S3) includes step S3.1): enter the measurement mode, and set the load impedance, test channel, voltage range and frequency band range.

Further, the test parameters include current, voltage, output waveform, input voltage signal value, signal frequency, DC component, AC component, interference current and beat frequency.

The beneficial effects of the present invention are:

In the present invention, through the automatic control of the relay network, the safety protection and conversion circuit, the load resistance switching of different resistance values of the resistance network, the signal conditioning circuit amplifies the signal and adds the signal zero point circuit, which improves the sampling accuracy and stability, and makes the detection The electrical parameters and waveform accuracy are higher, the linearity error is reduced, the structure is simple, and it is widely used in the fields of medical device detection and industrial control.

Description of drawings

Fig. 1 is a structural connection block diagram of the present invention;

Fig. 2 is a circuit connection schematic diagram of CPU single-chip microcomputer of the present invention;

Fig. 3 is a circuit connection schematic diagram of the adjustable gain amplifier of the present invention;

Fig. 4 is a circuit connection diagram of the access point of the present invention;

Fig. 5 is a circuit connection schematic diagram of relay DQ1～DQ3 of the present invention;

Fig. 6 is a circuit connection schematic diagram of relay DQ4～DQ7 of the present invention;

FIG. 7 is a schematic diagram of a circuit connection of the relay DQ8 of the present invention.

detailed description

In order to enable those skilled in the art to better understand the technical solutions in the embodiments of the present invention, and to make the above-mentioned purposes, features and advantages of the embodiments of the present invention more obvious and understandable, the following describes the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings For further detailed explanation.

Referring to Fig. 1, the present invention comprises housing, circuit board and touch screen, and housing comprises: main housing, film button; Circuit board comprises: relay network, resistance network, signal conditioning circuit, CPU single-chip microcomputer and power supply part; Wherein, CPU single-chip microcomputer It is with 12-bit high-speed AD, and the 12-bit high-speed AD adopts SMT32F407VET6; the relay network is connected with the resistance network for automatic control, safety protection and conversion circuit; the resistance network is connected with the signal conditioning circuit for generating test signals; The conditioning circuit is connected with the CPU single-chip microcomputer for amplifying the signal and processing AD sampling; the power supply part generates the digital and analog power required by the system for system power supply; the touch screen is connected with the CPU single-chip microcomputer for displaying output signals, waveform diagrams and measured values .

In this embodiment, the relay network includes relays, and the relays use TQ2-L2-5V; the resistor network includes load resistors, and the load resistors are divided into 300Ω load resistors, 500Ω load resistors, 1000Ω load resistors, 2000Ω load resistors, and 10KΩ load resistors and an external extended 80Ω load resistor; the signal conditioning circuit includes an adjustable gain amplifier, which is used to amplify the signal by 1-128 times and adjust the signal zero point to 1.25V. The adjustable gain amplifier adopts PGA280; the power module includes lithium Battery charging circuit, 3.3V power supply, 5V backlight and relay power supply, ±5V analog circuit power supply and one-button switch circuit; wherein, the lithium battery charging circuit includes a battery charging controller, and the controller adopts MCP73831T-2ATI/OT ;3.3V power supply includes IC chip, IC chip adopts TPS62260DDC; 5V backlight and relay power supply includes integrated switch, boost converter adopts TPS61040; ±5V analog circuit power supply includes integrated switch, integrated switch adopts TPS65133; Including switch MOS tube and unidirectional diode.

In this embodiment, a thin film transistor drive circuit is provided between the touch screen and the CPU microcontroller, and the touch screen adopts a 4.3-inch capacitive touch screen.

The working principle of the present invention is: according to the test setting, the software controls relays DQ1-DQ3 to select one or two of the signal access points J1-J3, and controls DQ4-DQ8 to select the load resistance network for testing, and DQ8 is for selecting the external resistors and internal relays. After the voltage test signal is divided by measuring the voltage dividing resistors R238~R242 and R244, the voltage signal is sent to pin 7 of the PGA280, that is, channel 2, for amplification and the median value of the signal is raised, and the conditioned signal is sent to pin 23 for further testing. AD sampling, according to the size of the AD value, the CPU automatically adjusts the magnification of the PGA280 to an appropriate value to ensure the integrity of the signal and obtain complete measurement data. The signal median voltage input pin of PGA280 is pin 3, and the voltage of this pin is output by the DA output pin 30 of the CPU, which can be adjusted by software.

In this embodiment, when the current is tested, the current test signal is converted into a voltage signal by the R274 and then sent to channel 1 of the PGA280, and the flow and processing methods of other signals are the same as the above working principles.

A portable detection method based on a neuromuscular electrical stimulator, said method comprising the steps of:

S1) Turn on the device first;

S2) The output terminals of the neuromuscular electrical stimulator are divided into positive and negative poles and respectively connected to the signal input terminals of the device;

S3) Select the channel and impedance on the device, enter the test interface, enter the measurement mode, and set the load impedance, test channel, voltage range and frequency band range;

S4) After turning on the neuromuscular electrical stimulator, start the output, conduct a test, and obtain test parameters, including: current (RMS), voltage (RMS), current (MAX), voltage (MAX), output waveform, input voltage Signal value, signal frequency, DC component, AC component, interference current and beat frequency.

In this embodiment, when testing the current (MAX, RMS) and voltage (MAX, RMS), the signal passes through the relay network to select one, two or three of channels 1 to 3, and then connects to the load resistance network and PGA280. The high-speed AD sampling of the CPU obtains the original data, and the CPU obtains the current (MAX, RMS) and voltage (MAX, RMS) values through Fourier transform processing; when testing the input signal value, the signal passes through the relay network, load resistance network and After the PGA280, the original data is obtained through the high-speed AD sampling of the CPU. By changing the sampling time, the sampling frequency can be changed between 10K and 100K; when testing the DC component, the original data is obtained through measurement, and the CPU processes it through Fourier transform to obtain DC component; when testing the AC component, the original data is obtained through measurement, and the CPU obtains the AC component through Fourier transform processing; when testing the interference current and beat frequency, the interference current and beat frequency are generally composed of two or more channel signals , one of which has a specific amplitude and frequency, and the other has a specific amplitude and variable frequency; the current and frequency of each channel can be measured separately; the effective value of the interference current is realized through the superposition of input signals.

As can be seen from the foregoing embodiments, the present invention automatically controls through the relay network, safety protection and conversion circuit, load resistance switching of different resistance values of the resistance network, and the signal conditioning circuit amplifies the signal and adds a signal zero point circuit, which improves the sampling accuracy and Stability makes the detection of electrical parameters and waveforms more accurate, reduces linear errors, simple structure, and is widely used in medical device detection and industrial control fields.

Finally, it is noted that the above embodiments are only used to illustrate the technical solutions of the present invention without limitation. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the present invention can be carried out Modifications or equivalent replacements without departing from the spirit and scope of the technical solution of the present invention shall be covered by the claims of the present invention.

Claims (9)

1. A portable detection device based on a neuromuscular electrical stimulator, comprising a housing, a circuit board, a software system and a touch screen, characterized in that: the housing includes: a main housing, a button cap and a mounting fixture; the The circuit board includes: relay network, resistor network, signal conditioning circuit, CPU single-chip microcomputer and power supply module; among them, The CPU microcontroller is a 12-bit high-speed AD, and the 12-bit high-speed AD adopts SMT32F407VET6; The relay network is connected with the resistance network for automatic control, safety protection and switching circuits; The resistor network is connected with the signal conditioning circuit for generating the test signal; The signal conditioning circuit is connected with the CPU single-chip microcomputer for amplifying the signal and processing AD sampling; The power module is used to provide the power required by the system; The touch screen is connected with the CPU single-chip microcomputer for displaying output signals and waveform diagrams. 2. A portable detection device based on a neuromuscular electrical stimulator according to claim 1, wherein the relay network includes a relay, and the relay adopts TQ2-L2-5V. 3. A kind of portable detection device based on neuromuscular electrical stimulator according to claim 1, it is characterized in that: described resistance network comprises load resistance, and described load resistance is divided into 300Ω load resistance, 500Ω load resistance, 1000Ω load resistance , 2000Ω load resistor, 10KΩ load resistor and external extension 80Ω load resistor. 4. A kind of portable detection device based on neuromuscular electrical stimulator according to claim 1, is characterized in that: described signal conditioning circuit comprises adjustable gain amplifier, and described adjustable gain amplifier is used for amplifying signal 1- 128 times and adjust the zero point of the signal to 1.25V, the adjustable gain amplifier adopts PGA280. 5. A portable detection device based on a neuromuscular electrical stimulator according to claim 1, wherein the power module includes a lithium battery charging circuit, a 3.3V power supply, a 5V backlight and a relay power supply, and a ±5V analog circuit Power supply and one-button switch circuit; among them, The lithium battery charging circuit includes a battery charging controller, and the controller adopts MCP73831T-2ATI/OT; The 3.3V power supply includes an IC chip, and the IC chip adopts TPS62260DDC; The 5V backlight and relay power supply includes an integrated switch, and the boost converter uses TPS61040; The ±5V analog circuit power supply includes an integrated switch, and the integrated switch adopts TPS65133; The one-button switch circuit includes a switch MOS tube and a one-way diode. 6. A kind of portable detection device based on neuromuscular electrical stimulator according to claim 1, is characterized in that: a thin film transistor drive circuit is provided between the touch screen and the CPU microcontroller, and the touch screen adopts a 4.3-inch capacitive touch screen. 7. A portable detection method based on a neuromuscular electrical stimulator, said method comprising the steps of: S1) Turn on the device first; S2) The output terminals of the neuromuscular electrical stimulator are divided into positive and negative poles and respectively connected to the signal input terminals of the device; S3) Select the channel and impedance on the device, and enter the test interface; S4) After turning on the neuromuscular electrical stimulator, start the output, conduct a test, and obtain test parameters. 8. A kind of portable detection method based on nerve electrical stimulator according to claim 1, it is characterized in that: described step S3) comprises step S3.1): enter measurement mode, set load impedance, test channel, voltage range and frequency range. 9. According to claim 1, a portable detection method based on nerve electrical stimulator, characterized in that: said test parameters include current, voltage, output waveform, input voltage signal value, signal frequency, DC component, AC component , interference current and beat frequency.