An electromyographic signal collector and rehabilitation system

Abstract

The application relates to a myoelectric signal collector and a rehabilitation system, which comprises a main control chip for controlling the transmission of signals on the myoelectric signal collector; a control circuit electrically connected with the output end of the main control chip, the control circuit being used for controlling the working state of a myoelectric collection circuit and a neuromuscular electric stimulation circuit according to the control signal sent by the main control chip; the myoelectric collection circuit being used for collecting the muscle group signals of a target muscle group through electrode pieces electrically connected with an electrostatic protection circuit; and the neuromuscular electric stimulation circuit being used for stimulating the target muscle group at low frequency through the electrode pieces electrically connected with the electrostatic protection circuit. The application can improve the myoelectric signal collection precision and neuromuscular electric stimulation precision of the muscle group, reduce the measurement error and delay, and meet the actual application requirements.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of electronics, in particular to an electromyography signal collector and a rehabilitation system. BACKGROUND

[0002] Surface electromyography signal is the electrical change on the body surface caused by the electrical conduction of a large number of nerve fibers and muscle fibers and the movement of a large number of ions in the body fluid during the movement of human muscles, which can reflect the functional state of the nerve and muscle to a certain extent. When the limbs have movement disorders, one form of rehabilitation training is to measure the electromyography signal of the muscle / muscle group causing the movement disorder, analyze the collected electromyography signal, and perform neuromuscular electrical stimulation on the corresponding muscle / muscle group, so as to adjust the intensity of neuromuscular electrical stimulation according to the current electromyography signal.

[0003] As known, when performing neuromuscular electrical stimulation, the electrode patch needs to be attached to the skin of the corresponding muscle group, and the specific muscle group is stimulated to twitch or contract by applying low-frequency current through the electrode patch; when collecting the electromyography signal of the muscle group, the electrode patch also needs to be attached to the skin of the corresponding muscle group.

[0004] However, in the prior art, the electromyography signal collection and analysis and neuromuscular electrical stimulation control have the defects of signal delay and poor accuracy. At the same time, when the neuromuscular electrical stimulation and electromyography signal collection of a certain muscle group of the human body are needed, two pairs of electrode patches need to be attached to the skin of the corresponding muscle group and two groups of wires need to be connected to perform neuromuscular electrical stimulation and electromyography signal collection, which is high in cost and poor in convenience. SUMMARY

[0005] In order to solve the above problems, the purpose of the present application is to provide an electromyography signal collector and a rehabilitation system which can collect the electromyography signal of a muscle group and improve its accuracy, and at the same time can give neuromuscular electrical stimulation to reduce measurement error and delay.

[0006] An electromyography signal collector, comprising:

[0007] A main control chip for controlling the transmission of signals on the electromyography signal collector;

[0008] A control circuit electrically connected to the output end of the main control chip, the control circuit being configured to control the working state of the electromyography collection circuit and the neuromuscular electrical stimulation circuit according to the control signal sent by the main control chip;

[0009] An electromyography collection circuit for collecting the muscle group signal of a target muscle group through an electrode patch electrically connected to an electrostatic protection circuit;

[0010] A neuromuscular electrical stimulation circuit for low frequency stimulation of a target muscle group via electrodes electrically connected to an electrostatic protection circuit.

[0011] In addition, the myoelectric signal collector provided by the application can further have the following additional technical features.

[0012] Further, the control circuit comprises a driving circuit, a driving protection circuit and a relay, a first input end of the relay is electrically connected to an output end of the driving circuit, a second input end of the relay is electrically connected to the myoelectric collection circuit or the neuromuscular electrical stimulation circuit, a first output end of the relay is electrically connected to an input end of the electrostatic protection circuit, and a second output end of the relay is grounded.

[0013] Further, the driving circuit comprises a first resistor, a second resistor electrically connected to an output end of the first resistor, and a first triode, a third resistor and a second triode connected in parallel with the second resistor in sequence, a collector of the first triode and the second triode is electrically connected to a MOS tube through a fourth resistor and a fifth resistor respectively, and a drain of the MOS tube is electrically connected to the driving protection circuit through a third diode.

[0014] Further, the driving protection circuit comprises a magnetic bead, a first capacitor and a freewheeling diode, an input end of the magnetic bead is electrically connected to an output end of the driving circuit, an input end of the first capacitor and an output end of the freewheeling diode are electrically connected to an output end of the magnetic bead respectively, and an output end of the first capacitor and an input end of the freewheeling diode are grounded.

[0015] Further, the electrostatic protection circuit comprises a second capacitor and an ESD tube, a first / second input end of the second capacitor and a first / second input end of the ESD tube are electrically connected to the relay and the electrode respectively, and output ends of the second capacitor and the ESD tube are grounded.

[0016] Further, the myoelectric collection circuit comprises a floating ground circuit and a buffer circuit electrically connected to output ends of the electrodes respectively, and a first amplification circuit, a high-pass filter circuit, a low-pass filter circuit, a second amplification circuit and a sampling circuit connected in sequence to the buffer circuit.

[0017] Further, the neuromuscular electrical stimulation circuit is a PWM pulse output circuit.

[0018] Further, the electrode comprises a flexible base layer made of polyimide, a myoelectric sensor and a neuromuscular electrical stimulator are sequentially arranged upwards along the base layer on the flexible base layer, and the thickness of the flexible base layer is between 116 μm and 152 μm.

[0019] Furthermore, the detection surface of the electromyographic sensor is coaxially arranged with the stimulation surface of the neuromuscular electrical stimulator, and the stimulation surface is located on the side of the detection surface close to the axis.

[0020] Furthermore, the flexible base layer includes a first contact surface and a second contact surface, the contact area of ​​the first contact surface is larger than the contact area of ​​the second contact surface, and the first contact surface and the second contact surface have different shapes, including ellipse, rounded rectangle or circle.

[0021] A rehabilitation system, comprising the above-mentioned electromyographic signal collector.

[0022] The electromyographic signal collector and rehabilitation system proposed in the present invention include: a main control chip for controlling the transmission of signals on the electromyographic signal collector; a control circuit electrically connected to the output end of the main control chip, and the control circuit is used to control the working state of the electromyographic acquisition circuit and the neuromuscular electrical stimulation circuit according to the control signal sent by the main control chip; the electromyographic acquisition circuit is used to collect the muscle group signals of the target muscle group through the electrode sheet electrically connected to the electrostatic protection circuit, thereby improving the accuracy of the electromyographic signal acquisition of the muscle group; the neuromuscular electrical stimulation circuit is used to perform low-frequency stimulation on the target muscle group through the electrode sheet electrically connected to the electrostatic protection circuit, thereby improving the accuracy of the neuromuscular electrical stimulation of the muscle group and reducing measurement errors and delays. The present invention can protect the static electricity on the human skin and prevent the static electricity from being released to other circuits through the electrode sheet, resulting in malfunction and damage to the equipment. In addition, the present application can simultaneously perform electromyographic signal collection and neuromuscular electrical stimulation on muscle groups in the same position, without the need to switch back and forth between neuromuscular electrical stimulation and electromyographic signal collection connections. This can reduce the connection of wires and the use of electrodes, as well as the operator's operating steps, thereby reducing the difficulty of use and improving convenience, thus meeting actual application needs. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is a structural block diagram of an electromyographic signal collector;

[0024] Figure 2 for Figure 1 Schematic diagram of the control circuit Figure 1 The structural diagram in ;

[0025] Figure 3 for Figure 1 Schematic diagram of the structure of the main control circuit, myoelectric acquisition circuit and neuromuscular electrical stimulation;

[0026] Figure 4 for Figure 1 The structural block diagram of the electromyographic acquisition circuit;

[0027] Figure 5 for Figure 2Structure diagram of middle driving circuit.

[0028] Main element symbol explanation:

[0029] Master chip 10 Control circuit 20 Drive circuit 21 Drive protection circuit 22 Relay 23 Myoelectricity collection circuit 30 Buffer circuit 31 First amplification circuit 32 High-pass filter circuit 33 Low-pass filter circuit 34 Second amplification circuit 35 Sampling circuit 36 Floating ground circuit 37 Neuromuscular electrical stimulation circuit 40 Electrostatic protection circuit 50 Electrode patch 60

[0030] The following detailed description will further describe the present application with reference to the above-mentioned drawings. DETAILED DESCRIPTION

[0031] In order to make the objects, features and advantages of the present application more apparent, the following will describe the specific embodiments of the present application in detail with reference to the accompanying drawings. The drawings show several embodiments of the present application. However, the present application can be realized in many different forms and is not limited to the embodiments described herein. On the contrary, these embodiments are provided to make the disclosure of the present application more thorough and comprehensive.

[0032] It should be noted that when an element is referred to as being "fixedly attached" to another element, it can be directly on the other element or intervening elements can also be present. When an element is referred to as being "connected" or "coupled" to another element, it can be directly connected or coupled to the other element or intervening elements can also be present. The terms "vertical", "horizontal", "left", "right", "upper", "lower", and the like as used herein are used for explanation only and not to indicate or imply that a specific orientation of the device or element is required or that a specific orientation is to be construed to be the only orientation.

[0033] In the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connecting", "fixing" and the like should be understood broadly, for example, it can be fixedly connected, or detachably connected, or integrally connected; it can be mechanically connected, or electrically connected; it can be directly connected, or indirectly connected through an intermediate medium, or it can be the internal communication of two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0034] As Figures 1 to 5 shown, an electromyographic signal collector for neuromuscular electrical stimulation and electromechanical signal collection of muscle groups of the human body. It comprises an electromyographic signal collection circuit 30 and a neuromuscular electrical stimulation circuit 40 electrically connected to a control circuit 20 and a main control chip 10, and an electrode sheet 60 electrically connected to the electromyographic signal collection circuit 30 and the neuromuscular electrical stimulation circuit 40 through an electrostatic protection circuit 50.

[0035] Further, the main control chip 10 is used for controlling the transmission of signals on the myoelectricity signal collector. In the embodiment, the main control chip 10 adopts the processor AT91SAM7SE512 of the ATMEL company.

[0036] Further, the control circuit 20 is electrically connected with the output end of the main control chip 10, and the control circuit 20 is used for controlling the working states of the myoelectricity collection circuit 30 and the neuromuscular electrical stimulation circuit 40 according to the control signals sent by the main control chip 10. For example, the control circuit 20 controls the neuromuscular electrical stimulation circuit 40 to perform neuromuscular electrical stimulation on the muscle groups of the human body, and controls the myoelectricity collection circuit 30 to collect the myoelectricity signals of the muscle groups of the human body.

[0037] Specifically, the control circuit 20 includes a driving circuit 21, a driving protection circuit 22 and a relay 23. The first input end of the relay 23 is electrically connected with the output end of the driving circuit 21, the second input end of the relay 23 is electrically connected with the myoelectricity collection circuit 30 or the neuromuscular electrical stimulation circuit 40, the first output end of the relay 23 is electrically connected with the input end of the electrostatic protection circuit 50, and the second output end of the relay 23 is grounded.

[0038] Further, the driving circuit 21 includes a first resistor, a second resistor electrically connected with the output end of the first resistor, a first triode, a third resistor and a second triode connected in parallel with the second resistor in sequence, the collector of the first triode and the collector of the second triode are electrically connected with a MOS tube through a fourth resistor and a fifth resistor respectively, and the drain of the MOS tube is electrically connected with the driving protection circuit 22 through a third diode. The first resistor is a driving resistor, which is used for providing a conduction voltage for the first triode.

[0039] It can be understood that the first resistor to the fifth resistor R1-R5, the first triode Q1, the second triode Q2, the first MOS tube QC1 and the third diode D3 cooperate to form the driving circuit 21 for driving the relay 23. The driving circuit 21 is designed to determine the working states of the myoelectricity collection circuit 30 and the neuromuscular electrical stimulation circuit 40 according to the control signals of the main control chip 10.

[0040] Further, the driving protection circuit 22 includes a magnetic bead L1, a first capacitor C1 and a freewheeling diode D2. The input end of the magnetic bead L1 is electrically connected with the output end of the driving circuit 21, the input end of the first capacitor C1 and the output end of the freewheeling diode D2 are electrically connected with the output end of the magnetic bead L1 respectively, and the output end of the first capacitor C1 and the input end of the freewheeling diode D2 are grounded.

[0041] It can be understood that a magnetic bead L1 is connected in series at the input end of the relay 23, and a capacitor C1 and a diode D2 are connected in. The magnetic bead L1 is responsible for differential mode filtering, the capacitor C1 can prevent the driving voltage from being suddenly changed, and the diode D2 is a freewheeling diode. When the relay 23 is turned on or turned off, the reverse electromotive force generated by the inductive coil in the relay 23 is offset through the freewheeling diode, thereby achieving the effect of protecting the relay 23 and the driving circuit 21.

[0042] Further, the electromyography acquisition circuit 30 is configured to acquire the muscle group signal of the target muscle group through the electrode sheet 60 electrically connected to the electrostatic protection circuit.

[0043] Specifically, the electromyography acquisition circuit 30 includes a floating ground circuit 37 and a buffer circuit 31 electrically connected to the output end of the electrode sheet 60, and a first amplification circuit 32, a high-pass filter circuit 33, a low-pass filter circuit 34, a second amplification circuit 35 and a sampling circuit 36 connected in sequence to the buffer circuit 31. The other end of the floating ground circuit 37 is electrically connected to the first amplification circuit 32, configured to provide a floating voltage to the sensor on the electrode sheet 60 while isolating interference from other circuits and direct current ground, thereby improving the stability of the electromyography signal acquisition. In the embodiment, the floating ground circuit 37 is composed of two operational amplifiers connected by resistors.

[0044] It can be understood that, in the embodiment, the obtained electromyography signal is subjected to buffer processing through the buffer circuit 31, and then input to the first amplification circuit 32 for first-stage amplification. The amplified electromyography signal is subjected to filtering through the high-pass filter 33 and the low-pass filter 34 in sequence, and then subjected to second-stage amplification through the second amplifier 35, and then input to the sampling circuit 36, so as to complete the processing and sampling of the electromyography signal. The sampling circuit 36 can transmit the obtained electromyography information to the master control chip 10, so that the master control chip 10 stimulates the corresponding muscle group through the electrode sheet 60 according to the acquired electromyography signal.

[0045] Further, the neuromuscular electrical stimulation circuit 40 is configured to stimulate the target muscle group at a low frequency through the electrode sheet 60 electrically connected to the electrostatic protection circuit. The neuromuscular electrical stimulation circuit 40 is a PWM pulse output circuit. It can be understood that the neuromuscular electrical stimulation circuit 40 can generate a corresponding stimulation signal through the stimulation circuit according to the stimulation information issued by the master control chip 10, so as to stimulate the corresponding muscle group.

[0046] Further, the electrostatic protection circuit 50 includes a second capacitor and an ESD tube. The first / second input ends of the second capacitor and the first / second input ends of the ESD tube are electrically connected to the relay 23 and the electrode sheet 60, respectively. The output ends of the second capacitor and the ESD tube are grounded.

[0047] It can be understood that by adding the electrostatic protection circuit 50 between the electrode sheet 60 and the relay 23 contact, the capacitor C2 and the ESD tube D1, when the static electricity passes through the ESD tube D1, because the static voltage is much higher than the breakdown voltage of the ESD tube D1, the ESD tube D1 is turned on, and the static electricity is discharged to the ground, limiting the voltage from being too high, thereby achieving protection for the neuromuscular electrical stimulation circuit 40 and the electromyographic acquisition circuit 30. At the same time, the capacitor C2 can play a filtering role, thereby filtering out excess electrical noise, making the output neuromuscular electrical stimulation more stable and powerful, and making the collected electromyographic signal more stable and reliable.

[0048] Further, the electrode sheet 60 is electrically connected to the electromyographic acquisition circuit 30 and the neuromuscular electrical stimulation circuit 40 through a multi-channel transmission line or two transmission lines. The electrode sheet 60 includes a flexible base layer made of polyimide, and an electromyographic sensor and a neuromuscular electrical stimulator are sequentially arranged on the flexible base layer from the bottom layer upwards. The thickness of the flexible base layer is between 116 μm and 152 μm.

[0049] Specifically, the detection surface of the electromyographic sensor and the stimulation surface of the neuromuscular electrical stimulator are coaxially arranged, and the stimulation surface is located on the side of the detection surface close to the axis. It can be understood that the stimulation surface of the neuromuscular electrical stimulator is located at the center of the electrode sheet 60, and the detection surface of the electromyographic sensor is located at the edge of the electrode sheet 60. In other embodiments, the stimulation surface of the neuromuscular electrical stimulator and the detection surface of the electromyographic sensor can be multiple and are arranged on the electrode sheet 60 at equal intervals.

[0050] Specifically, the flexible base layer includes a first contact surface and a second contact surface, the contact area of the first contact surface is larger than that of the second contact surface, and the shapes of the first contact surface and the second contact surface are different, including an oval shape, a rounded rectangular shape, or a circular shape. It can be understood that by designing the first contact surface and the second contact surface, different contact surfaces can be selected according to the area of the muscle group required to be tested by the testee.

[0051] The myoelectric signal collector provided by the application comprises a main control chip, a control circuit, a myoelectric collection circuit and a neuromuscular electric stimulation circuit.

[0052] The myoelectric signal collector provided by the application comprises a main control chip, a control circuit, a myoelectric collection circuit and a neuromuscular electric stimulation circuit.

[0053] In the description of the present specification, the description of the terms "one embodiment", "some embodiments", "an example", "a specific example" or "some examples" means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present specification, the illustrative description of the above terms does not necessarily mean the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0054] The technical features of the above embodiments can be combined in any manner. In order to make the description concise, all possible combinations of the technical features in the above embodiments are not described, however, as long as the combinations of the technical features do not exist contradictions, they should be considered as the scope of the present application.

[0055] The above embodiments only express several implementation manners of the present application, and the description is more specific and detailed, but it should not be understood as a limitation on the patent scope of the present application. It should be noted that for ordinary skilled persons in the art, without departing from the concept of the present application, several modifications and improvements can be made, which are all within the protection scope of the present application. Therefore, the protection scope of the patent of the present application should be subject to the appended claims.

Claims

1. An electromyographic signal acquisition device, characterized in that, The application relates to an electromyography signal acquisition device. The application relates to an electromyography signal acquisition device. The application relates to an electromyography signal acquisition device. The application relates to an electromyography signal acquisition device. The application relates to an electromyography signal acquisition device. The application relates to an electromyography signal acquisition device. The application relates to an electromyography signal acquisition device.

2. The myoelectric signal acquisition device of claim 1, wherein, The application relates to an electromyography signal acquisition device.

3. The myoelectric signal acquisition device of claim 2, wherein, The application relates to an electromyography signal acquisition device. The application relates to an electromyography signal acquisition device. The application relates to an electromyography signal acquisition device. The application relates to an electromyography signal acquisition device. The application relates to an electromyography signal acquisition device. The application relates to an electromyography signal acquisition device. The application relates to an electromyography signal acquisition device. The application relates to an electromyography signal acquisition device. The application relates to an electromyography signal acquisition device. The application relates to an electromyography signal acquisition device. The application relates to an electromyography signal acquisition device. The application relates to an electromyography signal acquisition device. 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The myoelectric signal acquisition device of claim 2, wherein, The drive protection circuit comprises a magnetic bead, a first capacitor and a freewheeling diode; an input end of the magnetic bead is electrically connected with an output end of the drive circuit; an input end of the first capacitor and an output end of the freewheeling diode are respectively electrically connected with an output end of the magnetic bead; and an output end of the first capacitor and an input end of the freewheeling diode are grounded.

5. The myoelectric signal acquisition device of claim 1, wherein, The electromyographic signal acquisition circuit comprises a floating ground circuit and a buffer circuit electrically connected with the electrode output end respectively, and a first amplification circuit, a high-pass filter circuit, a low-pass filter circuit, a second amplification circuit and a sampling circuit connected with the buffer circuit in sequence.

6. A rehabilitation system characterized by, The electromyographic signal acquisition device comprises the electromyographic signal acquisition circuit according to any one of claims 1 to 5.

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