CN103300853A - Diagnosis and treatment system based on surface myoelectricity - Google Patents
Diagnosis and treatment system based on surface myoelectricity Download PDFInfo
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Abstract
The invention discloses a diagnosis and treatment system based on surface myoelectricity. The diagnosis and treatment system comprises an upper computer collection module, an upper computer assessment module, an upper computer circulation electrical stimulation module, an upper computer biological feedback electrical stimulation module, a communication module, a digital processing controller, a multichannel surface myoelectricity electrode, a multichannel amplification filtering module, an analog-digital converter, a digital-analog converter, a multichannel power amplification module and an output current-limiting monitoring module. The diagnosis and treatment system has multiple functions such as collection and diagnostic assessment of surface electromyogram signals, circulation electrical stimulation, biological feedback electrical stimulation and the like, and are applicable to fields such as sports science, rehabilitation medicine, biomedical engineering and the like.
Description
Technical field
The present invention relates to a kind of diagnosis and therapy system based on surface myoelectric, belong to sports science field, rehabilitation medicine field and biomedical engineering field.
Background technology
Surface electromyogram signal (surface Electromyogram, sEMG) be that neuromuscular system carries out randomness and non-when random movable, bio electricity changes the one dimension voltage time sequence signal that obtains through surface electrode guiding, amplification, demonstration and record, its amplitude is 0-5000 μ V, and frequency is 30-500Hz.The dependency of various degrees between the active state of surface electromyogram signal and muscle and the functional status has been widely used in sports science at present, such as the motor technique analysis on its rationality, tired judge, the non-invasi prediction of anaerobic valve and muscle fiber types etc.; Clinical medicine all has important value such as aspects such as neuromuscular evaluation, biofeedback therapy, rehabilitations.
The main sensation nerve fiber of transcutaneous electrical stimulation (being called for short TENS) is inputted human body with the electrotherapy method for the treatment of pain by skin with specific low frequency pulse current.Neuromuscular swashs the main stimulus movement nerve fiber of therapy (being called for short NMES), uses the low frequency pulse current stimulated muscle it is shunk, and has recovered the method for its motor function.FES (being called for short FES) utilizes the low frequency pulse current of some strength, stimulate one or more groups muscle by predefined program, bring out muscular movement or simulate normal autonomic movement, to reach improvement or to recover by the purpose of stimulated muscle or muscle group function.
Chinese patent CN201958882U discloses a kind of monitoring device of epidermic muscle-electricity, the employing bipolar electrode detects, the trap level adopts the double T active electric network, has overcome the problem that epidermis sensor input impedance is low, information loss large and the power frequency interference performance is weak that commercially available Germany produces.
Chinese patent CN1088121A discloses a kind of reaction type apoplectic hemiplegia therapeutic instrument based on detecting the electromyographic signal that cranial nerve sends, adopt three electrode detection electromyographic signals, after its transfer power amplification, become high power impulse stimulation limbs of patient, help it to rebuild the human nerve passage, reach therapeutic effect.
In the market, most domestic and international surface myoelectric system can be divided into two classes: diagnostic system (such as the ME6000 myoelectricity tester of Finland Mega company) and electro-therapeutic system (such as the MyoTrac dual pathways biostimulation feedback apparatus of Canadian Thought company).They are the emphatically single work of settling signal collection assessment or electricity irritation respectively, belongs to the piece-rate system of diagnostic function and treatment function opposite independent.
Can be found out by above analysis, the electrode channel of existing part myoelectricity equipment is less, therefore the overall state of an illness assessment of sufferer is often needed by repeatedly settling electrode, repeatedly detects, and so unavoidably takes time and effort.The more important thing is in addition, most of instrument and equipment function singlenesses, can only finish separately myoelectricity collection assessment or electronic stimulation function, not only increase the expense of Instrument purchase, and because diagnosis and therapeutic process are relatively independent, can't make the data target that collects very effectively with the treatment combination, and guide the setting of electrical stimulation parameters, this has caused certain difficulty for the more excellent rehabilitation training the establishment of the project of sufferer.
Summary of the invention
Technical problem to be solved by this invention provides a kind of diagnosis and therapy system based on surface myoelectric.
Inventive concept of the present invention is: the relatively single independence of existing surface myoelectric functions of the equipments, the signals collecting of surface myoelectric and state of an illness assessment, training is finished separately by different instruments often with electric stimulation rehabilitation, between lack closely contact, the index of the surface electromyogram signal that collects can not go to instruct the setting of electrical stimulation parameters well, this causes diagnosis and therapeutic process mutually to disconnect, and seems independent separately, and relatedness is not strong.In addition, such instrument and equipment of existing part, collection and stimulation channels number average are less, can't finish at one time the diagnoses and treatment work of sufferer multiple location.
For this reason, the present invention trains the signals collecting of surface myoelectric and state of an illness assessment and electric stimulation rehabilitation and carries out function and be combined, by biofeedback technology will diagnose and therapeutic process be associated, the surface myoelectric index that allows collection analysis obtain, can better instruct the setting of electricity irritation parameters, utilize the therapeutic modalities such as circulation electricity irritation and biofeedback electricity irritation, help better restore funcitons of patient.Multi-channel surface myoelectric electrode of the present invention can be realized the multiplexing of surface electromyogram signal collection and electricity irritation function.Each passage is four lines, three electrodes, and four lines are two holding wires, a ground wire, a feedback line, and three electrodes are two signal electrodes, a reference electrode.The diagnosis and treatment work that can finish at one time the sufferer multiple location based on the diagnosis and therapy system of surface myoelectric of the present invention, efficient improves greatly.
Diagnosis and therapy system based on surface myoelectric of the present invention has been realized the functions such as the collection assessment, circulation electricity irritation, biofeedback electricity irritation of surface electromyogram signal, and is specific as follows:
1) collection of surface electromyogram signal: multichannel collecting, sample frequency 3.3KHz, amplification 600, passband 6Hz is to 1.2KHz.
2) assessment of surface electromyogram signal: comprise mid frequency (MF), on average do manual work frequency (MPF), zero-crossing rate (ZCR), average myoelectricity (AEMG), frequency spectrum area (SPA).
3) circulation electricity irritation: NMES, FES, the multiple stimulus modelity such as TENS is optional; The multiple stimulus waveforms such as single face ripple, two-sided ripple, mutual ripple are optional; Stimulating current intensity 0 to 10mA (RMS) is adjustable, and frequency 1 to 100Hz is adjustable, and 0 to 500 μ s is adjustable for pulse width.
4) biofeedback electricity irritation: on the basis of electricity irritation, (comprising sound, vision, game etc.) patient is carried out the interactive electronic stimulation of correlation type in conjunction with the multimedia function of native system.
Specifically, the present invention solves the technical scheme that its technical problem takes and is:
The diagnosis and therapy system that the present invention is based on surface myoelectric comprises:
The host computer acquisition module is used for sending to communication module the acquisition instructions of collection surface electromyographic signal, and receives the surface electromyogram signal from communication module;
Communication module is used for receiving the acquisition instructions that comes from the host computer acquisition module, the stimulation instructions that reception comes from host computer circulation electricity irritation module and host computer biofeedback electricity irritation module, and receives the surface electromyogram signal from the digital processing controller;
The digital processing controller, be used for the surface electromyogram signal that comes from analog-digital converter is carried out digital filtering, and acquisition instructions and stimulation instructions decoding to coming from communication module, produce stimulus sequence with control analog-digital converter collection surface electromyographic signal, control digital to analog converter;
Host computer circulation electricity irritation module is used for receiving the circulation electricity irritation instruction of user's input, and communication module is passed in circulation electricity irritation instruction;
Host computer biofeedback electricity irritation module is used for receiving the biofeedback electricity irritation instruction of user's input, and communication module is passed in biofeedback electricity irritation instruction;
The host computer evaluation module, be used for receiving the surface electromyogram signal that comes from the host computer acquisition module, and gauging surface myoelectricity parameter, described surface myoelectric parameter generally includes the mid frequency of surface electromyogram signal, the average acting frequency of surface electromyogram signal, the zero-crossing rate of surface electromyogram signal, the average myoelectricity intensity of surface electromyogram signal and the frequency spectrum area of surface electromyogram signal;
Digital to analog converter is used for receiving the stimulation instructions that comes from the digital processing controller, and produces corresponding stimulus sequence according to stimulation instructions;
The multi-channel power amplification module be used for to receive the stimulus sequence that comes from digital to analog converter, and amplifies the power of stimulus sequence and produce stimulus signal, sends to the output current limiting monitoring module;
The output current limiting monitoring module, be used for receiving the stimulus signal that comes from the multi-channel power amplification module, and stimulus signal is sent to the multi-channel surface myoelectric electrode stimulate, the output current of Real-Time Monitoring stimulus signal sends to analog-digital converter with the strength signal of output current;
The multi-channel surface myoelectric electrode is used for the collection surface electromyographic signal and sends to multichannel amplification filtering module, and is used for receiving the stimulus signal of output current limiting monitoring module and passing to the position that will stimulate;
Multichannel amplification filtering module be used for receiving and amplifying the surface electromyogram signal that comes from the multi-channel surface myoelectric electrode, and the surface electromyogram signal after will amplifying is done Filtering Processing;
Analog-digital converter is used for reception and comes from the surface electromyogram signal of multichannel amplification filtering module, and carries out analog digital conversion; Be used for simultaneously receiving the strength signal from the output current of output current limiting monitoring module, and carry out analog digital conversion.
Further, the present invention also comprises power module, described power module comprises insulating power supply, low-dropout linear voltage-regulating circuit and LC filter circuit, the outfan of insulating power supply respectively with the input of low-dropout linear voltage-regulating circuit, the input of LC filter circuit connects, the outfan of low-dropout linear voltage-regulating circuit is connected with the input of LC filter circuit, the outfan of LC filter circuit and described communication module, the digital processing controller, digital to analog converter, the multi-channel power amplification module, the output current limiting monitoring module, the multichannel filtering and amplifying circuit, the input of analog-digital converter connects respectively.
Further, power module of the present invention should be withstand voltage more than or equal to 4000Vac.
Further, communication module of the present invention turns the USB line by high-speed figure optocoupler and serial ports and forms, described high-speed figure optocoupler is used for receiving the surface electromyogram signal from the digital processing controller, and surface electromyogram signal is sent to serial ports turn the USB line, receive simultaneously the acquisition instructions and the stimulation instructions that turn the USB line from serial ports, and acquisition instructions and stimulation instructions are sent to the digital processing controller; Serial ports turns the USB line and be used for to receive the stimulation instructions that acquisition instructions and reception from the host computer acquisition module come from host computer circulation electricity irritation module, host computer biofeedback electricity irritation module, and described acquisition instructions and stimulation instructions be sent to described high-speed figure optocoupler, receive simultaneously the surface electromyogram signal from the high-speed figure optocoupler, and surface electromyogram signal is sent to the host computer acquisition module.
Further, the isolation voltage of high-speed figure optocoupler of the present invention is peak-to-peak value 7500Vac, and data transmission rate is 1MHz.
Further, multichannel amplification filtering module of the present invention comprises the surface myoelectric processing path of a plurality of passages, and the surface myoelectric of each passage is processed path and comprised pre-amplification circuit, active filter circuit and booster circuit;
Described pre-amplification circuit is used for reception from the surface electromyogram signal of multi-channel surface myoelectric electrode and amplifies, and the surface electromyogram signal after amplifying is sent to active filter circuit;
Described active filter circuit is used for receiving the surface electromyogram signal from pre-amplification circuit, and does Filtering Processing, and filtered surface electromyogram signal is sent to booster circuit;
Described booster circuit is used for receiving the surface electromyogram signal from active filter circuit, and surface electromyogram signal is sent to analog-digital converter.
Further, pre-amplification circuit of the present invention adopts the difference input structure that three operational amplifiers of same silicon chip manufacturing form.
Further, multi-channel power amplification module of the present invention comprises the electricity irritation path of a plurality of passages, and the electricity irritation path of each passage comprises voltage follower circuit, metal-oxide-semiconductor power amplification circuit and transformator booster circuit;
Described voltage follower circuit is used for receiving the stimulus sequence from digital to analog converter, and stimulus sequence is sent to the metal-oxide-semiconductor power amplification circuit;
Described metal-oxide-semiconductor power amplification circuit be used for to receive the stimulus sequence from voltage follower circuit, amplifies the power of stimulus sequence and produces stimulus signal, and stimulus signal is sent to the transformator booster circuit;
Described transformator booster circuit is used for receiving the stimulus signal from the metal-oxide-semiconductor power amplification circuit, and stimulus signal is sent to the output current limiting monitoring module.
Further, output current limiting monitoring module of the present invention comprises diode bridge heap, accurate sample resistance and audion current-limiting circuit;
Described diode bridge heap is used for receiving the stimulus signal from the multi-channel power amplification module, and stimulus signal is sent to accurate sample resistance;
Described accurate sample resistance is used for receiving the stimulus signal from the diode bridge heap, and stimulus signal is sent to the audion current-limiting circuit;
Described audion current-limiting circuit is used for receiving the stimulus signal from accurate sample resistance, and stimulus signal is sent to the multi-channel surface myoelectric electrode stimulates, the audion current-limiting circuit is the output current of Real-Time Monitoring stimulus signal simultaneously, and the strength signal of output current is sent to analog-digital converter.
Compared with prior art, the invention has the beneficial effects as follows: with signals collecting and the state of an illness assessment of surface myoelectric, Function Integration Mechanism is carried out in training with electric stimulation rehabilitation, realized the collection assessment of surface electromyogram signal, the circulation electricity irritation, the functions such as biofeedback electricity irritation, strengthened the relatedness of diagnosis and therapeutic process, the surface electromyogram signal that allows collection analysis obtain, can better instruct the setting of electricity irritation parameters, simultaneously in the during rehabilitation training, at sound, on the visual basis, increase the game link, improved the interactivity of user and system, help user better to recover extremity motor function.Multichannel collecting provided by the invention/stimulation diagnosis and therapy system can be finished diagnosis and the treatment work of sufferer multiple location at one time, has broad application prospects in the fields such as sports science, rehabilitation medicine, biomedical engineering.
Description of drawings
Fig. 1 is the structural representation of a kind of diagnosis and therapy system based on surface myoelectric of the present invention.
Fig. 2 is the structural representation of power module.
Fig. 3 is the structural representation of multichannel amplification filtering module.
Fig. 4 is the structural representation of multi-channel power amplification module.
Fig. 5 is the structural representation of output current limiting monitoring module.
The specific embodiment
The present invention will be further described below in conjunction with drawings and Examples.
Referring to Fig. 1, the diagnosis and therapy system that the present invention is based on surface myoelectric comprises host computer acquisition module, host computer evaluation module, host computer circulation electricity irritation module, host computer biofeedback electricity irritation module, communication module, digital processing controller, multi-channel surface myoelectric electrode, multichannel amplification filtering module, analog-digital converter, digital to analog converter, multi-channel power amplification module, output current limiting monitoring module.Diagnosis and therapy system of the present invention provides the several functions such as the collection of surface electromyogram signal and diagnostic assessment, circulation electricity irritation, biofeedback electricity irritation, and the collection assessment of surface myoelectric and the rehabilitation of electricity irritation are incorporated into same system.
1) collection of surface electromyogram signal: multichannel collecting, sample frequency 3.3KHz, amplification 600, passband 6Hz is to 1.2KHz.
2) assessment of surface electromyogram signal: comprise mid frequency (MF), on average do manual work frequency (MPF), zero-crossing rate (ZCR), average myoelectricity (AEMG), frequency spectrum area (SPA).
3) circulation electricity irritation: NMES, FES, the multiple stimulus modelity such as TENS is optional; The multiple stimulus waveforms such as single face ripple, two-sided ripple, mutual ripple are optional; Stimulating current intensity 0 to 10mA (RMS) is adjustable, and frequency 1 to 100Hz is adjustable, and 0 to 500 μ s is adjustable for pulse width.
4) biofeedback electricity irritation: on the basis of electricity irritation, (comprising sound, vision, game etc.) patient is carried out the interactive electronic stimulation of correlation type in conjunction with the multimedia function of native system.
The below introduces respectively operation principle and the function of above-mentioned module.
A kind of embodiment of communication module is: turn the USB line and the high-speed figure optocoupler forms by serial ports, finish the communication between host computer acquisition module, host computer circulation electricity irritation module, host computer biofeedback electricity irritation module and the digital processing controller.The electromyographic signal that digital processing control will collect turns the USB line by serial ports and is uploaded to the host computer acquisition module after treatment, carries out the demonstration of waveform and the Treatment Analysis of electromyographic signal; Host computer acquisition module, host computer circulation electricity irritation module, host computer biofeedback electricity irritation module turn the USB line with acquisition instructions, circulation electricity irritation instruction, biofeedback electricity irritation instruction by serial ports accordingly and send to the digital processing controller.Because each module of host computer is connected with electrical network 220V alternating current, the circuit of system of the present invention is connected with user, damage to user for the fluctuation that prevents electrical network is delivered to human body by circuit, so communication module comprises optocoupler, to guarantee certain withstand voltage isolation.In the system of the present invention, the optocoupler in the communication module is preferably the high-speed figure optocoupler, and model is the H11L1 of motorola inc, isolation voltage is 7500Vac (pk), data transmission rate can reach 1MHz, has namely guaranteed withstand voltage safety, has also guaranteed the efficient of transfer of data.
Fig. 2 shows a kind of embodiment of power module.Power module is the each several part power supply of circuit, is comprised of insulating power supply, low-dropout linear voltage-regulating circuit and LC filter circuit.As described in Figure 2, power module comprises insulating power supply, low-dropout linear voltage-regulating circuit and LC filter circuit, the outfan of insulating power supply is connected with the input of low-dropout linear voltage-regulating circuit, the input of LC filter circuit respectively, the outfan of low-dropout linear voltage-regulating circuit is connected with the input of LC filter circuit, and the outfan of LC filter circuit is connected respectively with the input of described communication module, digital processing controller, digital to analog converter, multi-channel power amplification module, output current limiting monitoring module, multichannel filtering and amplifying circuit, analog-digital converter.Because system of the present invention is connected with electrical network 220V alternating current, for the fluctuation that prevents electrical network reaches system, may should select the insulating power supply that meets relevant safety standard to the user cause danger, with the safety that guarantees to use.For example can select the medical type Switching Power Supply of two group outputs of the MPD-65 series of Mean Well company, withstand voltage 4000Vac (I/P-O/P), meet ANSI/AAMI ES60601-1, TUV EN60601-1, the safety standards such as IEC60601-1 are converted to direct current 12V and 5V doubleway output with electrical network 220V alternating current.Low-dropout linear voltage-regulating circuit further is transformed into the required magnitude of voltage of each module with the 5V of insulating power supply output, wherein, the supply voltage of digital processing controller is 3.3V and 1.8V, the supply voltage of analog-digital converter is 3.3V, the supply voltage of multichannel amplification filtering module is ± 3V, the supply voltage of multi-channel power amplification module and output current limiting monitoring module is 12V and 5V, and the supply voltage of digital to analog converter and communication module is 5V.Each road power supply that the LC filter circuit will obtain carries out the regular processing of filtering, and the control ripple suppresses noise in 5mV, avoids power supply noise to disturb the collection of electromyographic signal.
The digital processing controller is responsible for accepting and processing collection/stimulation instructions that communication module is sent, and finishes corresponding collection/stimulation work.It is the dsp chip of TMS320F2809 that digital processing controller of the present invention can be selected the model of TI company, and this resources of chip is abundant, the calculation process ability is strong, satisfies system requirements.And, this chip carries the analog-digital converter of 12-bit precision, oversampling technique in addition, analog-to-digital precision can be increased to 15-bit, raising is to the resolution of the surface electromyogram signal that collects, sample frequency is set in 3.3kHz, and assurance can accurately intactly gather out original surface electromyogram signal.Under circulation electricity irritation and biofeedback electrical stimulation pattern, the stimulation instructions that the digital processing controller sends communication module, as: electrical stimulation pattern (NMES, FES, TENS), electrical stimulation waveforms (unidirectional ripple, two-way ripple, mutual ripple), electrical stimulation current intensity, electrical stimulation signal frequency, electric stimulation pulse width etc., change the output stimulus sequence by digital to analog converter.
The host computer acquisition module is sent to communication module by setting acquisition channel quantity and choosing passage with acquisition instructions, and number of notifications word processing controller begins the collecting work of surface electromyogram signal; Afterwards, the host computer acquisition module receives the treated surface electromyogram signal that the digital processing controller is sent to communication module.The surface electromyogram signal waveform of each passage and data show and store at the host computer acquisition module.
The host computer evaluation module is written into the data of corresponding surface electromyogram signal from the host computer acquisition module, choose interested a certain section surface electromyographic signal and carry out the processing of time domain and frequency domain, wherein, can obtain the zero-crossing rate (ZCR) of surface electromyogram signal, the average myoelectricity intensity (AEMG) of surface electromyogram signal etc. by the analysis of time domain; The analysis of frequency domain is the frequency spectrum that obtains surface electromyogram signal by fast Fourier transform, then be converted to frequency spectrum, by calculating, finally obtain the frequency spectrum area (SPA) of surface electromyogram signal, the mid frequency (MF) of surface electromyogram signal, the frequency domain indexs such as average acting frequency (MPF) of surface electromyogram signal, These parameters in the host computer evaluation module, process calculate finish after, directly carry out the demonstration of digital quantization.
Host computer circulation electricity irritation module has multichannel electronic stimulation function, the instruction of user's input stimulus, as: electrical stimulation pattern (NMES, FES, TENS), electrical stimulation waveforms (unidirectional ripple, two-way ripple, mutual ripple), electrical stimulation current intensity, the electrical stimulation signal frequency, electric stimulation pulse width etc., stimulation instructions passes to the digital processing controller by communication module, through digital to analog converter, send stimulus sequence, this stimulus sequence behind the multi-channel power amplification module with power amplification, produce stimulus signal, be sent to the output current limiting monitoring module, final through the output of multi-channel surface myoelectric electrode, user is stimulated, reach therapeutic effect, satisfy Treatment need.Host computer biofeedback electricity irritation module is on the function basis of host computer circulation electricity irritation module, (comprising sound, vision, game etc.) patient is carried out the electronic stimulation of correlation type in conjunction with the multimedia function of this module.After the intensity of the surface electromyogram signal that the host computer acquisition module collects reaches the threshold value that system sets, host computer biofeedback electricity irritation module can be given the certain feedback of user, such as the encouragement on the sound (such as " you are excellent "), visual variation (such as the change on the color, literal prompting), the score in the game (as it is more to exceed the threshold value that system sets, the game score will be higher).Like this, on the basis of circulation electricity irritation, for user provides a kind of interactively therapeutic scheme, allow user with the process of system mutual in, reach the effect of rehabilitation.
The multi-channel surface myoelectric electrode is used for providing the multiplexing function of the collection of surface electromyogram signal and circulation electricity irritation, biofeedback electricity irritation.The multi-channel surface myoelectric electrode comprises four lines, three electrodes, and " four lines " wherein is two holding wires, a ground wire, a feedback line, and " three electrodes " is two signal electrodes, a reference electrode.Wherein, two signal electrodes are respectively by holding wire, with the input of the pre-amplification circuit in the difference form input multichannel amplification filtering module; Reference electrode links to each other with the ground level of system with ground wire; Feedback line links to each other with the screen layer of multi-channel surface myoelectric electrode.
Fig. 3 shows a kind of embodiment of multichannel amplification filtering module.Multichannel amplification filtering module has the surface myoelectric of a plurality of passages and processes path, and each passage comprises pre-amplification circuit, active filter circuit, booster circuit.Pre-amplification circuit is used for receiving the surface electromyogram signal from the multi-channel surface myoelectric electrode, and surface electromyogram signal is sent to active filter circuit; Active filter circuit is used for receiving the surface electromyogram signal from pre-amplification circuit, and surface electromyogram signal is sent to booster circuit; Booster circuit is used for receiving the surface electromyogram signal from active filter circuit, and surface electromyogram signal is sent to analog-digital converter.The difference input structure that three operational amplifiers that pre-amplification circuit adopts the same silicon chip of low noise, high cmrr, high input impedance to make form is in order to obtain the good original surface electromyogram signal of signal to noise ratio.Active filter circuit carries out Filtering Processing to the surface electromyogram signal that comes from pre-amplification circuit, and bandwidth is set to 6Hz to 1.2KHz, keeps effective electromyographic signal, the noise that the filtering passband is outer.Because multichannel amplification filtering module adopts dual power supply, signal amplitude has positive and negative, and the input signal amplitude of analog-digital converter should satisfy 0～3V, the processing of therefore surface electromyogram signal need being boosted.Booster circuit realizes by the adder that operational amplifier consists of, and the baseline of input signal is raised to 1.5V, makes surface electromyogram signal amplitude after the processing satisfy the input requirements of analog-digital converter.The overall gain of multichannel amplification filtering module is 600 times, bandwidth be 6Hz to 1.2KHz, resolution 0.2 μ V can guarantee that surface electromyogram signal is accurately intactly by acquisition process.
Digital to analog converter is used for reception and comes from the stimulation instructions that communication module is sent to the digital processing controller, as: electrical stimulation pattern (NMES, FES, TENS), electrical stimulation waveforms (unidirectional ripple, two-way ripple, mutual ripple), electrical stimulation current intensity, electrical stimulation signal frequency, electric stimulation pulse width etc. produce corresponding stimulus sequence according to stimulation instructions.It is the chip of TLV5614 that digital to analog converter can adopt the model of TI company, supports the output of 4 passages, and the digital-to-analogue conversion figure place reaches 12-bit, has guaranteed the conversion accuracy of stimulus sequence.
Fig. 4 shows a kind of embodiment of multi-channel power amplification module.The multi-channel power amplification module be used for to receive the stimulus sequence that comes from digital to analog converter, and amplifies the power of stimulus sequence and produce stimulus signal.The multi-channel power amplification module can be comprised of voltage follower circuit, metal-oxide-semiconductor power amplification circuit and transformator booster circuit.Voltage follower circuit is used for receiving the stimulus sequence from digital to analog converter, and stimulus sequence is sent to the metal-oxide-semiconductor power amplification circuit; The metal-oxide-semiconductor power amplification circuit be used for to receive the stimulus sequence from voltage follower circuit, amplifies the power of stimulus sequence and produces stimulus signal, and stimulus signal is sent to the transformator booster circuit; The transformator booster circuit is used for receiving the stimulus signal from the metal-oxide-semiconductor power amplification circuit, and stimulus signal is sent to the output current limiting monitoring module.Voltage follower circuit mainly plays the effect of impedance transformation, the stimulus sequence of metal-oxide-semiconductor power amplification circuit logarithmic mode transducer carries out power amplification, the transformator booster circuit is by the different winding ratio of transformer primary secondary, the stimulus signal that produces is done the processing of further boosting, reach the required voltage amplitude of stimulation pulse signal.
Fig. 5 shows a kind of embodiment of output current limiting monitoring module.The output current limiting monitoring module is used for receiving the stimulus signal that comes from the multi-channel power amplification module, stimulus signal is sent to the multi-channel surface myoelectric electrode to stimulate, and the output current of Real-Time Monitoring stimulus signal, the strength signal of output current is sent to analog-digital converter.The output current limiting monitoring module is comprised of diode bridge heap, accurate sample resistance, audion current-limiting circuit.The diode bridge heap is rectified into unidirectional stimulus waveform with the stimulation pulse signal that the transformator booster circuit in the multi-channel power amplification module produces.Accurate sample resistance is used for the Unidirectional stimulation waveform after the rectification is carried out current sampling, is converted to magnitude of voltage.When the electric current that monitors during greater than 10mA (RMS), the audion current-limiting circuit is started working, and stimulating current is stabilized in the scope of setting, the safety that the assurance system uses.
Claims (9)
1. the diagnosis and therapy system based on surface myoelectric is characterized in that, comprising:
The host computer acquisition module is used for sending to communication module the acquisition instructions of collection surface electromyographic signal, and receives the surface electromyogram signal from communication module;
Communication module is used for receiving the acquisition instructions that comes from the host computer acquisition module, the stimulation instructions that reception comes from host computer circulation electricity irritation module and host computer biofeedback electricity irritation module, and receives the surface electromyogram signal from the digital processing controller;
The digital processing controller, be used for the surface electromyogram signal that comes from analog-digital converter is carried out digital filtering, and acquisition instructions and stimulation instructions decoding to coming from communication module, produce stimulus sequence with control analog-digital converter collection surface electromyographic signal, control digital to analog converter;
Host computer circulation electricity irritation module is used for receiving the circulation electricity irritation instruction of user's input, and communication module is passed in circulation electricity irritation instruction;
Host computer biofeedback electricity irritation module is used for receiving the biofeedback electricity irritation instruction of user's input, and communication module is passed in biofeedback electricity irritation instruction;
The host computer evaluation module is used for receiving the surface electromyogram signal that comes from the host computer acquisition module, and gauging surface myoelectricity parameter;
Digital to analog converter is used for receiving the stimulation instructions that comes from the digital processing controller, and produces corresponding stimulus sequence according to stimulation instructions;
The multi-channel power amplification module be used for to receive the stimulus sequence that comes from digital to analog converter, and amplifies the power of stimulus sequence and produce stimulus signal, sends to the output current limiting monitoring module;
The output current limiting monitoring module, be used for receiving the stimulus signal that comes from the multi-channel power amplification module, and stimulus signal is sent to the multi-channel surface myoelectric electrode stimulate, the output current of Real-Time Monitoring stimulus signal sends to analog-digital converter with the strength signal of output current;
The multi-channel surface myoelectric electrode is used for the collection surface electromyographic signal and sends to multichannel amplification filtering module, and is used for receiving the stimulus signal of output current limiting monitoring module and passing to the position that will stimulate;
Multichannel amplification filtering module be used for receiving and amplifying the surface electromyogram signal that comes from the multi-channel surface myoelectric electrode, and the surface electromyogram signal after will amplifying is done Filtering Processing;
Analog-digital converter is used for reception and comes from the surface electromyogram signal of multichannel amplification filtering module, and carries out analog digital conversion; Be used for simultaneously receiving the strength signal from the output current of output current limiting monitoring module, and carry out analog digital conversion.
2. a kind of diagnosis and therapy system based on surface myoelectric according to claim 1, it is characterized in that: also comprise power module, described power module comprises insulating power supply, low-dropout linear voltage-regulating circuit and LC filter circuit, the outfan of insulating power supply respectively with the input of low-dropout linear voltage-regulating circuit, the input of LC filter circuit connects, the outfan of low-dropout linear voltage-regulating circuit is connected with the input of LC filter circuit, the outfan of LC filter circuit and described communication module, the digital processing controller, digital to analog converter, the multi-channel power amplification module, the output current limiting monitoring module, the multichannel filtering and amplifying circuit, the input of analog-digital converter connects respectively.
3. the diagnosis and therapy system based on surface myoelectric according to claim 2 is characterized in that: described power module should be withstand voltage more than or equal to 4000Vac.
4. a kind of diagnosis and therapy system based on surface myoelectric according to claim 1, it is characterized in that: described communication module turns the USB line by high-speed figure optocoupler and serial ports and forms, described high-speed figure optocoupler is used for receiving the surface electromyogram signal from the digital processing controller, and surface electromyogram signal is sent to serial ports turn the USB line, receive simultaneously the acquisition instructions and the stimulation instructions that turn the USB line from serial ports, and acquisition instructions and stimulation instructions are sent to the digital processing controller; Serial ports turns the USB line and be used for to receive the stimulation instructions that acquisition instructions and reception from the host computer acquisition module come from host computer circulation electricity irritation module, host computer biofeedback electricity irritation module, and described acquisition instructions and stimulation instructions be sent to described high-speed figure optocoupler, receive simultaneously the surface electromyogram signal from the high-speed figure optocoupler, and surface electromyogram signal is sent to the host computer acquisition module.
5. a kind of diagnosis and therapy system based on surface myoelectric according to claim 4,, it is characterized in that: the isolation voltage of described high-speed figure optocoupler is peak-to-peak value 7500Vac, data transmission rate is 1MHz.
6. a kind of diagnosis and therapy system based on surface myoelectric according to claim 1, it is characterized in that: described multichannel amplification filtering module comprises the surface myoelectric processing path of a plurality of passages, and the surface myoelectric of each passage is processed path and comprised pre-amplification circuit, active filter circuit and booster circuit;
Described pre-amplification circuit is used for reception from the surface electromyogram signal of multi-channel surface myoelectric electrode and amplifies, and the surface electromyogram signal after amplifying is sent to active filter circuit;
Described active filter circuit is used for receiving the surface electromyogram signal from pre-amplification circuit, and does Filtering Processing, and filtered surface electromyogram signal is sent to booster circuit;
Described booster circuit is used for receiving the surface electromyogram signal from active filter circuit, and surface electromyogram signal is sent to analog-digital converter.
7. a kind of diagnosis and therapy system based on surface myoelectric according to claim 6 is characterized in that: the difference input structure that three operational amplifiers that described pre-amplification circuit adopts same silicon chip to make form.
8. a kind of diagnosis and therapy system based on surface myoelectric according to claim 1, it is characterized in that: described multi-channel power amplification module comprises the electricity irritation path of a plurality of passages, and the electricity irritation path of each passage comprises voltage follower circuit, metal-oxide-semiconductor power amplification circuit and transformator booster circuit;
Described voltage follower circuit is used for receiving the stimulus sequence from digital to analog converter, and stimulus sequence is sent to the metal-oxide-semiconductor power amplification circuit;
Described metal-oxide-semiconductor power amplification circuit be used for to receive the stimulus sequence from voltage follower circuit, amplifies the power of stimulus sequence and produces stimulus signal, and stimulus signal is sent to the transformator booster circuit;
Described transformator booster circuit is used for receiving the stimulus signal from the metal-oxide-semiconductor power amplification circuit, and stimulus signal is sent to the output current limiting monitoring module.
9. a kind of diagnosis and therapy system based on surface myoelectric according to claim 1 is characterized in that: described output current limiting monitoring module comprises diode bridge heap, accurate sample resistance and audion current-limiting circuit;
Described diode bridge heap is used for receiving the stimulus signal from the multi-channel power amplification module, and stimulus signal is sent to accurate sample resistance;
Described accurate sample resistance is used for receiving the stimulus signal from the diode bridge heap, and stimulus signal is sent to the audion current-limiting circuit;
Described audion current-limiting circuit is used for receiving the stimulus signal from accurate sample resistance, and stimulus signal is sent to the multi-channel surface myoelectric electrode stimulates, the audion current-limiting circuit is the output current of Real-Time Monitoring stimulus signal simultaneously, and the strength signal of output current is sent to analog-digital converter.
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| CN112617866A (en) * | 2020-12-31 | 2021-04-09 | 深圳美格尔生物医疗集团有限公司 | EMG (electromagnetic EMG) electromyographic signal digital acquisition circuit and system |
| CN115778398A (en) * | 2022-11-11 | 2023-03-14 | 中节能风力发电股份有限公司 | Body surface electromyogram signal detection circuit and detection method |
| CN115778398B (en) * | 2022-11-11 | 2023-08-08 | 中节能风力发电股份有限公司 | Body surface electromyographic signal detection circuit and detection method |
| CN116531003A (en) * | 2023-06-20 | 2023-08-04 | 天津大学 | Surface myoelectricity acquisition system under functional electrical stimulation |
| CN116531003B (en) * | 2023-06-20 | 2024-04-19 | 天津大学 | Surface myoelectricity acquisition system under functional electrical stimulation |
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