Collecting device for surface electromyogram signals

Abstract

The utility model provides a surface electromyogram signal acquisition device which comprises a signal acquisition module, a pre-amplification and filtering module, a control module, a power supply module and a signal emission module, and the acquisition end of the signal acquisition module is used for acquiring surface electromyogram signals of a contact object. The output end of the signal acquisition module is connected with the input end of the pre-amplification and filtering module, and the signal acquisition module is used for amplifying and filtering the acquired surface electromyogram signals; the power supply module is respectively connected with the pre-amplification and filtering module and the control module and is used for supplying power to the pre-amplification and filtering module and the control module; the output end of the pre-amplification and filtering module is electrically connected with the input end of the control module, and the pre-amplification and filtering module is used for carrying out secondary filtering processing on the processed surface electromyogram signals; the output end of the control module is connected with the signal transmitting module. Therefore, the problems that a surface electromyogram signal collector is high in power consumption, large in size and low in collection result accuracy are effectively solved.

Description

Technical Field

[0001] The utility model relates to the technical field of bioelectricity control, in particular to a device for collecting surface electromyographic signals. Background Art

[0002] Surface electromyography (sEMG) is a bioelectric signal used to measure human muscle activity. By analyzing sEMG signals, we can obtain information such as muscle activity patterns, muscle contraction strength, and muscle fatigue, thereby providing researchers and medical professionals with rich physiological data, which is beneficial to improving human health and quality of life. Therefore, the collection of surface electromyography signals is particularly important.

[0003] In the existing surface electromyography signal collector, the surface electromyography signals are mainly collected by placing electrodes on the skin surface, and then the collected surface electromyography signals are amplified and filtered through the pre-amplification and filtering modules. Finally, the processed surface electromyography signals are sent to the controller, which analyzes the processed surface electromyography signals to obtain information on muscle activity patterns, force output and fatigue level.

[0004] Since the preamplifier and filter module is constructed based on discrete components, including several stages of preamplifiers and filters, the surface electromyography signal collector has the problems of high power consumption and large size. In addition, the preamplifier and filter module constructed by discrete components has the problem of large signal interference, which also leads to the problem of low accuracy of the surface electromyography signal collected by the surface electromyography signal collector. Utility Model Content

[0005] Based on the above-mentioned deficiencies of the prior art, the utility model provides a surface electromyography signal acquisition device to solve the problems of high power consumption, large size and low acquisition result accuracy of the surface electromyography signal collector brought about by the prior art.

[0006] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0007] The first aspect of the utility model provides a surface electromyography signal acquisition device, the acquisition device comprising:

[0008] Signal acquisition module, preamplification and filtering module, control module, power supply module and signal transmission module;

[0009] The signal acquisition module comprises at least N signal acquisition units, which are used to acquire surface electromyographic signals of the contact object, and the output end of the signal acquisition module is connected to the input end of the preamplification and filtering module;

[0010] The preamplifier and filter module includes at least N preamplifier and filter units, which are constructed based on a chip and its corresponding peripheral circuits and are used to amplify and filter the collected surface electromyography signals;

[0011] The power supply module is connected to the preamplifier and filter module and the control module respectively, and is used to supply power to the preamplifier and filter module and the control module;

[0012] The output end of the preamplifier and filter module is electrically connected to the input end of the control module, and is used to perform secondary filtering on the processed surface electromyography signal;

[0013] The output end of the control module is connected to the signal transmitting module, and is used to send the surface electromyography signal after secondary processing to an external device for storage and display.

[0014] Optionally, in the above-mentioned surface electromyography signal acquisition device, the signal acquisition unit includes: a first acquisition electrode, a second acquisition electrode and a reference ground electrode;

[0015] The first collecting electrode, the second collecting electrode and the first surface of the reference ground electrode are in contact with the skin of the contact object;

[0016] A shielding layer is disposed on the second surfaces of the first collection electrode, the second collection electrode and the reference ground electrode; wherein the second surfaces of the first collection electrode, the second collection electrode and the reference ground electrode refer to the opposite surfaces of the first surfaces of the first collection electrode, the second collection electrode and the reference ground electrode.

[0017] Optionally, in the above-mentioned surface electromyography signal acquisition device, the signal acquisition unit further includes a printed circuit board;

[0018] The first collecting electrode, the second collecting electrode and the reference grounding electrode are all arranged on the printed circuit board;

[0019] The first collecting electrode, the second collecting electrode and the reference grounding electrode are distributed in a straight line in the horizontal coordinate direction of the printed circuit board;

[0020] The first collection electrode, the second collection electrode and the reference ground electrode are distributed parallel to each other in the longitudinal direction of the printed circuit board.

[0021] Optionally, in the above-mentioned surface electromyography signal acquisition device, the thickness of the first acquisition electrode, the second acquisition electrode and the reference ground electrode ranges from no less than 0.5 mm to no more than 0.7 mm.

[0022] Optionally, in the above-mentioned surface electromyography signal acquisition device, the first acquisition electrode, the second acquisition electrode and the reference ground electrode are all copper-clad layers, and are made of flexible electrode sheets.

[0023] Optionally, in the above-mentioned surface electromyography signal acquisition device, the value of N is 8.

[0024] Optionally, in the above-mentioned surface electromyography signal acquisition device, the power supply module includes a power supply unit, a first linear voltage stabilizing unit and a second linear voltage stabilizing unit;

[0025] The power supply unit is electrically connected to the preamplifier and filter module through the first linear voltage regulator unit, and is used to supply power to the preamplifier and filter module;

[0026] The power supply unit is electrically connected to the control module through the second linear voltage regulator unit, and is used to supply power to the control module.

[0027] Optionally, in the above-mentioned surface electromyography signal acquisition device, the chip model of the preamplifier and filtering unit is AD8232, and the peripheral circuit corresponding to the chip is composed of a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, a seventh resistor, an eighth resistor, a ninth resistor, a tenth resistor, a first capacitor, a second capacitor and a third capacitor.

[0028] Optionally, in the above-mentioned surface electromyography signal acquisition device, the control module is a microcontroller.

[0029] Optionally, in the above-mentioned surface electromyography signal acquisition device, the signal transmission module is transmitted in a wireless manner.

[0030] The utility model provides a device for collecting surface electromyographic signals. The device comprises: a signal collection module, a preamplifier and filter module, a control module, a power supply module and a signal transmitting module. The signal collection module comprises at least N signal collection units for collecting surface electromyographic signals of a contact object. The output end of the signal collection module is connected to the input end of the preamplifier and filter module. The preamplifier and filter module comprises at least M preamplifier and filter units. The preamplifier and filter units are constructed based on a chip and its corresponding peripheral circuits, and are used to amplify and filter the collected surface electromyographic signals. The power supply module is respectively connected to the preamplifier and filter module and the control module for supplying power to the preamplifier and filter module and the control module. The output end of the preamplifier and filter module is electrically connected to the input end of the control module for performing secondary filtering on the processed surface electromyographic signals. The output end of the control module is connected to the signal transmitting module for sending the secondary processed surface electromyographic signals to an external device for storage and display. Therefore, based on the preamplifier and filter unit composed of the chip and its corresponding peripheral circuits, the amplifier and the filter are integrated in the chip, and at the same time, the preamplifier and the filter unit has the characteristics of low power consumption, small size and small signal interference, thereby effectively solving the problems of high power consumption, large size and low accuracy of acquisition results of surface electromyography signal collector. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings in the following description are only embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0032] Figure 1 A schematic diagram of the structure of a surface electromyography signal acquisition device provided by an embodiment of the utility model;

[0033] Figure 2 A schematic diagram of the structure of a peripheral circuit of AD8232 provided in an embodiment of the utility model;

[0034] Figure 3 Another schematic diagram of the structure of a laser safety protection circuit provided by an embodiment of the utility model;

[0035] Figure 4 Another schematic diagram of the structure of a laser safety protection circuit provided by an embodiment of the utility model;

[0036] Figure 5 A wiring diagram of a printed circuit board 24 provided in an embodiment of the utility model;

[0037] Figure 6 Another schematic diagram of the structure of a laser safety protection circuit provided by an embodiment of the utility model;

[0038] Figure 7 A schematic diagram of a circuit structure of a power supply unit provided in an embodiment of the utility model;

[0039] Figure 8 The present invention provides a flow chart of a method for collecting surface electromyography signals in an embodiment of the present invention. DETAILED DESCRIPTION

[0040] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0041] In the present invention, relational terms such as first and second, etc. are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the presence of other identical elements in the process, method, article or device including the elements.

[0042] As can be seen from the background technology, the preamplifier and filtering module in the surface electromyography signal collector in the prior art is constructed based on discrete components, specifically including several stages of preamplifiers and filters. This leads to the existing surface electromyography signal collector having the problems of high power consumption and large size. In addition, the preamplifier and filtering module constructed by discrete components also has the problem of large signal interference, which in turn leads to the problem of low accuracy of the collection results of the surface electromyography signal collector.

[0043] Therefore, an embodiment of the utility model provides a surface electromyography signal acquisition device, including: a signal acquisition module, a preamplifier and filtering module, a control module, a power supply module and a signal transmission module, wherein the preamplifier and filtering unit in the preamplifier and filtering module is composed of a chip and its corresponding peripheral circuit combination, so there are no problems of high power consumption, large size and low accuracy of acquisition results.

[0044] So see Figure 1 , shows a schematic diagram of the structure of a surface electromyography signal acquisition device provided by an embodiment of the utility model, the acquisition device includes: a signal acquisition module 11, a preamplification and filtering module 12, a control module 13, a power supply module 14 and a signal transmission module 15.

[0045] The signal acquisition module may include N signal acquisition units 111 for acquiring surface electromyographic signals of the contact object. The output end of the signal acquisition module is connected to the input end of the preamplification and filtering module.

[0046] The preamplifier and filter module may include N preamplifier and filter units 121, which are constructed based on a chip and its corresponding peripheral circuits and are used to amplify and filter the collected surface electromyography signals.

[0047] In some specific embodiments, N represents a positive integer, and the value of N is 8. Therefore, the signal acquisition module may include 8 signal acquisition units, and the preamplification and filtering module may include 8 preamplification and filtering units, so the signal acquisition units in the signal acquisition module correspond to the preamplification and filtering units in the preamplification and filtering module one by one, which helps to improve the stability, controllability and maintainability of the acquisition device. Of course, N can also be other thresholds, which can be set according to needs.

[0048] It should be noted that, since the signal strength of the collected original surface electromyography (sEMG) signal is relatively weak, the signal value is generally between 10μV and 5mV, and the signal frequency is mainly concentrated below 1kHz. At this time, the original surface electromyography signal belongs to a low-frequency signal, and there are many interference signals. For example, during the breathing process of the contact object, the muscles in the lungs will contract and relax, which may generate electrical signals, which may interfere with sEMG. It can also be interference introduced by power frequency interference, line interference, and poor grounding. Therefore, in the utility model, it is necessary to amplify and filter the surface electromyography signal collected by the signal acquisition module 101.

[0049] In some specific embodiments, the chip model of the preamplifier and filter unit is AD8232, and the peripheral circuit corresponding to the chip is composed of a first resistor (R1), a second resistor (R2), a third resistor (R3), a fourth resistor (R4), a fifth resistor (R5), a sixth resistor (R6), a seventh resistor (R7), an eighth resistor (R8), a ninth resistor (R9), a tenth resistor (R10), a first capacitor (C1), a second capacitor (C2) and a third capacitor (C3). It should be noted that the schematic diagram of the structure of the peripheral circuit corresponding to the chip can be seen in Figure 2As the AD8232 chip and its corresponding peripheral circuits are existing technologies, the present invention will not further describe the specific structure of the AD8232 chip and the structure of its peripheral circuits.

[0050] It should also be noted that in the AD8232 chip, the RLD pin can establish a reference level, which is the same phase as the 50Hz common-mode interference signal captured by the contact object, but has the opposite polarity. Therefore, the reference level can offset the 50Hz common-mode interference signal captured by the contact object, thereby improving the accuracy of collecting surface electromyography signals. Among them, the 50Hz common-mode interference signal refers to the 50Hz interference signal captured from the power line during the sEMG acquisition process.

[0051] The power supply module is connected to the preamplifier and filter module and the control module respectively, and is used to supply power to the preamplifier and filter module and the control module;

[0052] The output end of the preamplifier and filter module is electrically connected to the input end of the control module, and is used to perform secondary filtering on the processed surface electromyography signal.

[0053] It should be noted that although the preamplifier and filter module performs a certain degree of filtering on the collected surface electromyographic signal, in some cases, there may still be some residual noise or interference signals. Therefore, in the present invention, the processed surface electromyographic signal is still subjected to secondary filtering by the control module, so as to more thoroughly remove these residual interferences, thereby making the final surface electromyographic signal more stable and reliable.

[0054] In some specific embodiments, the control module is a microcontroller. Optionally, the control module can be a microcontroller based on an ARM Cortex-M4 core model. Among them, the ARM Cortex-M4 core is integrated with a high-resolution analog-to-digital converter, which can be used for the collection and conversion of multi-channel analog signals.

[0055] In some specific embodiments, the control module can also be a STM32F407 microcontroller or a STM32F407VGT6 microcontroller. The STM32F407VGT6 microcontroller is a model in the STM32F407 microcontroller series, and they all belong to microcontrollers based on the ARM Cortex-M4 architecture, but the utility model is not limited to these microcontrollers of several signals, and can be specifically set according to needs.

[0056] In some specific embodiments, in combination Figure 1 , see Figure 3, shows another structural schematic diagram of a surface electromyography signal acquisition device provided by an embodiment of the utility model, the control module 13 includes an analog-to-digital converter 31 (Analog-to-Digital Converter, ADC), Ch1 to ChN all represent input channels of the ADC, which are used to receive the processed surface electromyography signals transmitted by the preamplifier and filtering module.

[0057] The output end of the control module is connected to the signal transmitting module, and is used to send the surface electromyography signal after secondary processing to an external device for storage and display.

[0058] In some specific embodiments, the transmission mode of the signal transmission module is a wireless transmission mode. Then the signal transmission module can be a Bluetooth module. Optionally, the Bluetooth module can be a BLE106 model Bluetooth or a WH-BLE106 model Bluetooth, because the LE106 Bluetooth module has the advantages of low power consumption, high integration and stability, thereby providing the acquisition device with low power consumption and stability characteristics. Of course, the wireless transmission mode of the utility model is not limited to the Bluetooth mode, and can also be other wireless transmission modes, which can be specifically set according to needs.

[0059] It should be noted that the signal transmission module can support wireless communication between the control module and the preset host computer, so that after the control module performs secondary filtering on the processed surface electromyography signal it receives, the processed surface electromyography signal can be sent to the preset host computer through the signal transmission module, so that the relevant collection personnel can obtain the final surface electromyography signal through the preset host computer.

[0060] In an embodiment of the utility model, the acquisition end of the signal acquisition module is in contact with the contact object to collect surface electromyographic signals of the contact object, and the collected surface electromyographic signals are sent to the preamplifier and filtering unit in the preamplifier and filtering module. The surface electromyographic signals are amplified and filtered by the preamplifier and filtering unit, and then sent to the corresponding input channel of the ADC in the control module. The ADC in the control module performs analog-to-digital conversion and secondary filtering on the processed surface electromyographic signals, and finally the secondary processed surface electromyographic signals are sent to the signal transmission module, and the secondary processed surface electromyographic signals are sent to an external device for storage and display through the signal transmission module 15, so that the acquisition device of the embodiment of the utility model has the characteristics of low power consumption, small size and high accuracy of acquisition results.

[0061] In some specific embodiments, in combination Figure 1 as well as Figure 3 , see Figure 4, shows another structural schematic diagram of a surface electromyography signal acquisition device provided by an embodiment of the utility model, wherein the signal acquisition unit 111 includes a first acquisition electrode J1, a second acquisition electrode J2 and a reference ground electrode J3.

[0062] In some specific embodiments, the thickness of the first collecting electrode, the second collecting electrode and the reference grounding electrode ranges from no less than 0.5 mm to no more than 0.7 mm.

[0063] In some specific embodiments, the first collection electrode, the second collection electrode and the reference ground electrode are all copper-clad layers, and are made of flexible electrode sheets.

[0064] It is understandable that the copper coating is an exposed copper coating. In order to ensure the strength of the electrical signal to a certain extent, the area of ​​the copper coating is not less than 1 cm2. For example, the size of the copper coating can be 14 mm*7 mm. Moreover, in the field of surface electromyography signal acquisition, electrodes can be divided into two types: wet electrodes and dry electrodes according to the material. However, since the maintenance of wet electrodes is inconvenient, the present invention adopts dry electrodes. In order to improve the fit between the electrode and the skin and improve the acquisition quality of the surface electromyography signal, the first acquisition electrode, the second acquisition electrode and the reference ground electrode of the present invention all adopt flexible electrode sheets.

[0065] It should be noted that the first collecting electrode and the second collecting electrode are in contact with the collected object by pasting the gold-plated copper sheet electrode.

[0066] The first surfaces of the first collecting electrode, the second collecting electrode and the reference ground electrode are in contact with the skin of the contact object.

[0067] It should be noted that, in terms of working principle, the reference ground electrode J3 serves as a common reference ground, the first collection electrode J1 and the second collection electrode J2 serve as two collection ends of surface electromyographic signals respectively, and the first collection electrode J1 and the second collection electrode J2 send the collected surface electromyographic signals to the corresponding preamplifier and filtering unit 121. Since the utility model adopts differential signal input technology in the collection process and introduces a reference ground electrode, the collected surface electromyographic signals reduce noise interference and improve the common mode interference suppression capability.

[0068] A shielding layer is disposed on the second surface of the first collecting electrode, the second collecting electrode and the reference grounding electrode.

[0069] The second surfaces of the first collection electrode, the second collection electrode and the reference ground electrode refer to the opposite surfaces of the first surfaces of the first collection electrode, the second collection electrode and the reference ground electrode.

[0070] It can be understood that in the embodiment of the utility model, the first acquisition electrode, the second acquisition electrode and the reference ground electrode are each provided with a shielding layer on the second surface opposite to the first surface, which can effectively reduce the influence of the external electromagnetic field (such as 50Hz power frequency interference) on the surface electromyographic signal. This is because the shielding layer is a physical barrier layer that can be used to block interference signals from external electromagnetic fields, especially 50Hz power frequency interference related to the power system, and the shielding layer can also reduce the sensitivity of the electrodes (J1, J2, and J3) to the surrounding electromagnetic induction.

[0071] It should be emphasized that in the embodiment of the utility model, in order to increase the structural strength of the first collection electrode J1, the second collection electrode J2 and the reference ground electrode J3, so as to make them more durable and reliable, a wiring enhancement process can be performed on the electrodes when the electrodes are produced. The specific operation can be to introduce additional materials to enhance the structural strength into the electrodes, or to adopt other processing technologies, as long as the wiring part of the electrodes can be enhanced to make the electrodes have higher strength and durability.

[0072] In an embodiment of the utility model, the signal acquisition unit includes a first acquisition electrode, a second acquisition electrode and a reference ground electrode. The electrodes in the signal acquisition unit contact the skin of the contact object and collect surface electromyography signals, which is helpful to reduce noise interference of the surface electromyography signals.

[0073] In some specific embodiments, the present invention provides a surface electromyography signal acquisition device, the signal acquisition unit 111 also includes a printed circuit board 24, which can be seen in Figure 5 A schematic diagram of the wiring of the printed circuit board 24 is shown.

[0074] The first collecting electrode, the second collecting electrode and the reference grounding electrode are all arranged on the printed circuit board.

[0075] The first collection electrode, the second collection electrode and the reference ground electrode are distributed in a straight line in the horizontal coordinate direction of the printed circuit board.

[0076] The first collection electrode, the second collection electrode and the reference ground electrode are distributed parallel to each other in the longitudinal coordinate direction of the printed circuit board.

[0077] Specifically, the size of the printed circuit board (PCB) is 23 mm*35 mm, and of course it can also be other threshold sizes, which can be set specifically according to requirements.

[0078] Alternatively, see Figure 5As shown, the printed circuit board 24 is also provided with an interface 31. Among them, the size of the interface 31 can be 13.5mm*13mm, of course, it can also be other threshold sizes, and can be set specifically according to needs. Specifically, the interface 31 can be an interface of PJ342 audio. It should be noted that the interface 31 is connected to the preamplifier and filter module 12, and the connection method is an active connection, that is, the interface 31 can be inserted into any one of the preamplifier and filter units 121 in the preamplifier and filter module 12, and can also be pulled out from the preamplifier and filter unit 121, which is conducive to storing the interface 31 separately, thereby reducing the space occupied by the signal acquisition unit, and then improving the portability of the surface electromyography signal collector. Since the signal acquisition module 11 is connected to the preamplifier and filter module 12 through the interface 31, the utility model can also improve the operability of the surface electromyography signal collector.

[0079] In an embodiment of the utility model, the signal acquisition unit includes a first acquisition electrode, a second acquisition electrode, a reference ground electrode and a printed circuit board, which helps to improve the signal separation, circuit isolation, performance optimization, maintainability and modular design of the acquisition device.

[0080] In some specific embodiments, in combination Figure 1 , Figure 3 as well as Figure 4 , see Figure 6 , shows another structural schematic diagram of a surface electromyography signal acquisition device provided by an embodiment of the utility model, where the power supply module 114 includes a power supply unit 31, a first linear voltage stabilizing unit 32 and a second linear voltage stabilizing unit 33.

[0081] The power supply unit is connected to the preamplifier and filter module through the first linear voltage stabilizing unit, and is used to supply power to the preamplifier and filter module.

[0082] The power supply unit is connected to the control module through the second linear voltage stabilizing unit, and is used to supply power to the control module.

[0083] It should be noted that the power supply unit is composed of an eleventh resistor (R11), a twelfth resistor (R12), a thirteenth resistor (R13), a fourth capacitor (C4), a fifth capacitor (C5), a sixth capacitor (C6), a BL4056 chip, a battery E, a field effect transistor MOS, a first diode (D1), a second diode (D2) and a third diode (D3). The battery E is specifically a rechargeable battery, and the battery E can optionally be a lithium battery. Of course, the embodiment of the utility model is not limited to the lithium battery as a rechargeable battery, and can also be other rechargeable batteries, which can be specifically set according to needs.

[0084] It should also be noted that the BL4056 chip can specifically be a BL4056C chip, and the BL4056C chip is a BL4056C-42ES chip. The BL4056C-42ES chip is a single-cell lithium-ion battery management chip, which is mainly used for battery charging control. In an embodiment of the utility model, the BL4056 chip is used to manage the charging and discharging of battery E, and through the charging status of battery E, the CHRG# port in the BL4056 chip is connected to the first diode D1, and then after battery E indicates that charging is completed, the BL4056 chip indicates that the output terminal STDBY# is connected to the second diode D2, so that when charging battery E, the first diode D1 is in a lit state, and after battery E is fully charged, the second diode D2 is in a lit state. In order to enable users to distinguish between different charging states of battery E, the light emitted by the first diode D1 and the second diode D2 is different. Among them, the circuit structure diagram of the power supply unit can be referenced. Figure 7 shown.

[0085] It should also be noted that the BL4056 chip can also directly charge the battery E using the USB data line without shutting down the computer. The output data of the battery E is respectively sent to the first linear voltage regulator unit and the second linear voltage regulator unit. The first linear voltage regulator unit and the second linear voltage regulator unit are both low dropout linear regulator (LDO) chips.

[0086] In the embodiment of the utility model, the preamplifier and filter module and the control module are powered respectively by the power supply unit, the first linear voltage regulator unit and the second linear voltage regulator unit, thereby achieving isolation of analog and digital power supplies, thereby further reducing the noise of the sEMG signal and effectively improving the quality of the sEMG signal.

[0087] Corresponding to the surface electromyography signal acquisition device provided by the above-mentioned embodiment of the utility model, see Figure 8 The present invention also provides a flow chart of a surface electromyography signal acquisition method, which is applicable to the surface electromyography signal acquisition device mentioned in the above-mentioned embodiment of the present invention. The surface electromyography signal acquisition method includes:

[0088] S801. Collect surface electromyographic signals of a contact object through a signal acquisition module.

[0089] S802, amplifying and filtering the surface electromyography signal through a pre-amplification and filtering module.

[0090] S803. Perform secondary filtering on the processed surface electromyography signal through the control module to obtain a target surface electromyography signal.

[0091] S804. Send the target surface electromyographic signal to an external device for storage and display through the signal transmission module.

[0092] It should be noted that, for the specific contents of the signal acquisition module, preamplification and filtering module, control module, power supply module and signal transmission module, please refer to the contents detailed in the above-mentioned embodiments of the utility model, which will not be repeated here.

[0093] In the embodiment of the utility model, the surface electromyographic signal of the contact object is collected, and the surface electromyographic signal is amplified and filtered to reduce signal interference, thereby facilitating medical diagnosis.

[0094] The utility model provides a device for collecting surface electromyographic signals. The device comprises: a signal collection module, a preamplifier and filter module, a control module, a power supply module and a signal transmitting module. The signal collection module comprises at least N signal collection units for collecting surface electromyographic signals of a contact object. The output end of the signal collection module is connected to the input end of the preamplifier and filter module. The preamplifier and filter module comprises at least M preamplifier and filter units. The preamplifier and filter units are constructed based on a chip and its corresponding peripheral circuits, and are used to amplify and filter the collected surface electromyographic signals. The power supply module is respectively connected to the preamplifier and filter module and the control module for supplying power to the preamplifier and filter module and the control module. The output end of the preamplifier and filter module is electrically connected to the input end of the control module for performing secondary filtering on the processed surface electromyographic signals. The output end of the control module is connected to the signal transmitting module for sending the secondary processed surface electromyographic signals to an external device for storage and display. Therefore, based on the preamplifier and filter unit composed of the chip and its corresponding peripheral circuits, the amplifier and the filter are integrated in the chip, and at the same time, the preamplifier and the filter unit has the characteristics of low power consumption, small size and small signal interference, thereby effectively solving the problems of high power consumption, large size and low accuracy of acquisition results of surface electromyography signal collector.

[0095] Professionals may further appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, computer software, or a combination of the two. In order to clearly illustrate the interchangeability of hardware and software, the composition and steps of each example have been generally described in the above description according to function. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professionals and technicians may use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of the present utility model.

[0096] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A surface electromyography signal acquisition device, characterized in that: The acquisition device includes: a signal acquisition module, a preamplification and filtering module, a control module, a power supply module and a signal transmission module; The signal acquisition module comprises at least N signal acquisition units, which are used to acquire surface electromyographic signals of the contact object, and the output end of the signal acquisition module is connected to the input end of the preamplification and filtering module; The preamplifier and filter module includes at least N preamplifier and filter units, which are constructed based on a chip and its corresponding peripheral circuits and are used to amplify and filter the collected surface electromyography signals; The power supply module is connected to the preamplifier and filter module and the control module respectively, and is used to supply power to the preamplifier and filter module and the control module; The output end of the preamplifier and filter module is electrically connected to the input end of the control module, and is used to perform secondary filtering on the processed surface electromyography signal; The output end of the control module is connected to the signal transmitting module, and is used to send the surface electromyography signal after secondary processing to an external device for storage and display.

2. The collection device according to claim 1, characterized in that: The signal acquisition unit comprises: a first acquisition electrode, a second acquisition electrode and a reference ground electrode; The first collecting electrode, the second collecting electrode and the first surface of the reference ground electrode are in contact with the skin of the contact object; A shielding layer is disposed on the second surfaces of the first collection electrode, the second collection electrode and the reference ground electrode; wherein the second surfaces of the first collection electrode, the second collection electrode and the reference ground electrode refer to the opposite surfaces of the first surfaces of the first collection electrode, the second collection electrode and the reference ground electrode.

3. The collection device according to claim 2, characterized in that: The signal acquisition unit also includes a printed circuit board; The first collecting electrode, the second collecting electrode and the reference grounding electrode are all arranged on the printed circuit board; The first collecting electrode, the second collecting electrode and the reference grounding electrode are distributed in a straight line in the horizontal coordinate direction of the printed circuit board; The first collection electrode, the second collection electrode and the reference ground electrode are distributed parallel to each other in the longitudinal direction of the printed circuit board.

4. The collection device according to claim 2, characterized in that: The thickness of the first collecting electrode, the second collecting electrode and the reference grounding electrode ranges from not less than 0.5 mm to not more than 0.7 mm.

5. The collection device according to claim 2, characterized in that: The first collection electrode, the second collection electrode and the reference ground electrode are all copper-clad layers, and are made of flexible electrode sheets.

6. The collection device according to claim 1, characterized in that: The value of N is 8.

7. The collection device according to claim 1, characterized in that: The power supply module includes a power supply unit, a first linear voltage stabilizing unit and a second linear voltage stabilizing unit; The power supply unit is electrically connected to the preamplifier and filter module through the first linear voltage regulator unit, and is used to supply power to the preamplifier and filter module; The power supply unit is electrically connected to the control module through the second linear voltage regulator unit, and is used to supply power to the control module.

8. The collection device according to claim 1, characterized in that: The chip model of the preamplifier and filtering unit is AD8232, and the peripheral circuit corresponding to the chip is composed of a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, a seventh resistor, an eighth resistor, a ninth resistor, a tenth resistor, a first capacitor, a second capacitor and a third capacitor.

9. The collection device according to claim 1, characterized in that: The control module is a microcontroller.

10. The collection device according to claim 1, characterized in that: The signal transmission module uses a wireless transmission method.

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