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CN101036601A - Real time control device and control method by two-degrees-of freedom myoelectricity artificial hand - Google Patents

Real time control device and control method by two-degrees-of freedom myoelectricity artificial hand Download PDF

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Publication number
CN101036601A
CN101036601A CN 200710068219 CN200710068219A CN101036601A CN 101036601 A CN101036601 A CN 101036601A CN 200710068219 CN200710068219 CN 200710068219 CN 200710068219 A CN200710068219 A CN 200710068219A CN 101036601 A CN101036601 A CN 101036601A
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freedom
myoelectric
carpi ulnaris
extensor
hand
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CN100515366C (en
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罗志增
席旭刚
李文国
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Hangzhou Electronic Science and Technology University
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Hangzhou Electronic Science and Technology University
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Abstract

本发明涉及到一种将肌电信息控制人工假手的技术。现有的多自由度假手采用顺序控制方式或开关切换方式实现控制,缺乏实时性、仿生性能差。本发明包括三个肌电拾电传感器,肌电拾电传感器与后级放大滤波电路、A/D转换电路、单片机和二自由度肌电假手的两个电机顺序信号连接。具体控制方法:三个肌电拾电传感器分别采集来自人体的尺侧腕伸肌、尺侧腕屈肌和指伸肌对应的表面肌电信号,经过放大、滤波、A/D转换处理后输入单片机中;单片机对表面肌电信号强弱进行判断,并输出四路控制信号,经驱动电路带动假手的电机,完成假手的四个动作。本发明的手部多运动模式识别正确率达到100%,实现了高可靠识别率下二自由度假手四个动作的实时控制。

Figure 200710068219

The invention relates to a technology for controlling artificial hand with electromyographic information. The existing multi-freedom prosthetic hand adopts sequential control method or switch switching method to realize control, which lacks real-time performance and poor bionic performance. The invention comprises three myoelectric pick-up sensors, and the myoelectric pick-up sensor is connected with a rear-stage amplification and filter circuit, an A/D conversion circuit, a single-chip microcomputer and two motors of a two-degree-of-freedom myoelectric prosthetic hand for sequential signals. Specific control method: Three electromyographic pickup sensors respectively collect the surface electromyographic signals corresponding to the extensor carpi ulnaris, flexor carpi ulnaris and extensor fingers from the human body, and input them after amplification, filtering and A/D conversion processing In the single-chip microcomputer; the single-chip microcomputer judges the strength of the surface electromyography signal, and outputs four control signals, and drives the motor of the artificial hand through the driving circuit to complete the four actions of the artificial hand. The recognition accuracy rate of the hand multi-motion pattern reaches 100%, and realizes the real-time control of the four movements of the two-free artificial hand under the high reliable recognition rate.

Figure 200710068219

Description

Two degrees of freedom EMG-controlling prosthetic hand real-time control apparatus and control method
Technical field
The invention belongs to information and control technology field, relate to a kind of technology that myoelectric information control is manually done evil through another person, specifically is two degrees of freedom EMG-controlling prosthetic hand real-time control apparatus and control method.
Background technology
Electromyographic signal (Electromyography, abbreviation EMG) is a kind of bioelectrical signals of following musculation, is the signal of telecommunication root of musculation, has wherein contained the various information of musculation, comprises and the corresponding limb action pattern of musculation.Surface electromyogram signal (SurfaceElectromyography, abbreviation SEMG) then be on the EMG of shallow-layer muscle and the nerve trunk electrical activity at the comprehensive effect of skin surface.Because SEMG has the non-intruding characteristic on measuring, the individuality that is implemented detection is had no pain and characteristics easily, obtained application widely at numerous areas such as clinical medicine, sports medical science.
Obtain SEMG on the residual arm of hand amputee by surperficial power-collecting electrode, SEMG is carried out pattern information handle the action pattern that can obtain hand, can reach the do evil through another person purpose of control of myoelectricity man power according to the mode treatment result.The control that SEMG is the amputee by deformed limb and mechanical prosthetic hand connects, and realizes the bridge of its control intention.For the people with disability of the limbs disappearance day after tomorrow, still have limbs control consciousness generally speaking as the sound healthy people of limbs, medically be referred to as " phantom limb sense ".The wearer of EMG-controlling prosthetic hand utilizes this sensation just, controls the musculation of deformed limb by the mode that similar healthy people controls limb action, and then reaches the purpose to the control of doing evil through another person.So the myoelectricity powered artificial hand has action nature, characteristics that bionical performance is good, has been subjected to increasing concern.
The EMG-controlling prosthetic hand of single-degree-of-freedom is generally controlled powered artificial hand by the SEMG that picks up a pair of Antagonistic muscle of amputee's stump (as wrist protractor and wrist musculus flexor), with the positive and negative rotation of drive motors opening of realizing doing evil through another person with close up.As, when the SEMG of wrist protractor intensity reaches preset threshold, control motor forward rotation, vice versa.Thisly control the method for a motor positive and inverse respectively with the two-way electromyographic signal, reliable operation is used widely.The I of Tsing-Hua University type single-degree-of-freedom EMG-controlling prosthetic hand as people's developments such as, royal people become.Multi-freedom artificial limb need extract multivariant action pattern information usually from the SEMG of few passage, discrimination is difficult to reach 100%.1978, people such as Herberts developed multi-functional EMG-controlling prosthetic hand, utilized amputee's hallucination and based on the many action patterns identification of SEMG, controlled one and did evil through another person and finish the action of 3 degree of freedom, and the accuracy rate of action is 57%.After people's such as Denning improvement, the recognition correct rate that 3DOF is done evil through another person brings up to 72%.After 2000, the discrimination of multi-freedom degree muscle-electric artificial hand reaches more than 85%, but owing to still have certain misclassification rate, still has with a certain distance from practicality.At present, commercial multiple freedom degrees hand-prosthesis generally adopts sequential control mode (or switch switching mode) to realize the control of multi-freedom artificial limb, as, control is opened during the wrist protractor contraction, and control was closed up when the wrist musculus flexor shrank, wrist protractor, realization control sequence switching when the wrist musculus flexor shrinks (clenching fist) simultaneously, at this moment, wrist protractor control wrist is left-handed, and the dextrorotation of wrist musculus flexor control wrist realizes multivariant control by that analogy.Though utilize this method can realize the control of multi-freedom artificial limb, this method is because exist inconvenient operation, lack shortcomings such as real-time and bionical poor performance, thus on market, use and few.
Summary of the invention
Purpose of the present invention is exactly at the deficiencies in the prior art, provide a kind of accuracy rate height, bionical performance good, can control the control device of two degrees of freedom EMG-controlling prosthetic hand in real time, make its control device of finishing four actions of doing evil through another person, the control method of this device is provided simultaneously.
The present invention realizes four of the two degrees of freedom EMG-controlling prosthetic hand actions of doing evil through another person by receiving the corresponding SEMG of three vastus meat (extensor carpi ulnaris m., flexor carpi ulnaris m. and extensor digitorum).Four actions refer to opening of doing evil through another person, close up, wrist is stretched, wrist is bent; During no sports consciousness, three vastus meat are in relaxed state, do evil through another person and are failure to actuate.
The technical scheme of control device of the present invention: comprise that three myoelectricities that are contained on the residual arm pick up electric transducer, each myoelectricity picks up the elementary amplifying circuit that electric transducer comprises three power-collecting electrodes and the localityization that is connected with the power-collecting electrode signal, and three power-collecting electrodes are respectively anelectrode, negative electrode and ground electrode.The outfan of three elementary amplifying circuits connects with the input of corresponding back level amplification filtering circuit respectively, and the outfan of level amplification filtering circuit is connected with the input of A/D change-over circuit after three.Two motors of two degrees of freedom EMG-controlling prosthetic hand connect with corresponding drive circuit respectively.Single-chip microcomputer is connected with the outfan of A/D change-over circuit, the input end signal of drive circuit respectively.
The drive circuit that myoelectricity among the present invention picks up electric transducer, back level amplification filtering circuit, A/D change-over circuit, single-chip microcomputer, motor all adopts existing single-degree-of-freedom EMG-controlling prosthetic hand corresponding devices.
The control method of this two degrees of freedom EMG-controlling prosthetic hand real-time control apparatus: three myoelectricities pick up the SEMG that electric transducer is gathered extensor carpi ulnaris m., flexor carpi ulnaris m. and extensor digitorum's correspondence from human body respectively, in input single-chip microcomputer after amplification, filtering, the A/D conversion process; Single-chip microcomputer judges the SEMG power after handling, and exports four tunnel control signals, drives the motor of two degrees of freedom electrically powered hand through drive circuit, finishes four actions of two degrees of freedom electrically powered hand.
Single-chip microcomputer judges it is power combination by three road SEMG of extensor carpi ulnaris m., flexor carpi ulnaris m., extensor digitorum's correspondence to the SEMG after handling is strong and weak, and artificial hand controlled is opened, closed up, wrist is stretched, wrist is bent four actions.The strong and weak combination of three road SEMG with the corresponding relation of four actions is: the SEMG of extensor digitorum is strong, and the motor of control two degrees of freedom EMG-controlling prosthetic hand is done evil through another person and opened; Extensor carpi ulnaris m. SEMG is strong, flexor carpi ulnaris m. SEMG is strong, and the motor of control two degrees of freedom EMG-controlling prosthetic hand is done evil through another person and closed up; Extensor carpi ulnaris m. SEMG is strong, a little less than the flexor carpi ulnaris m. SEMG, the motor of control two degrees of freedom EMG-controlling prosthetic hand is done and is stretched the wrist action; Flexor carpi ulnaris m. SEMG is strong, a little less than the extensor carpi ulnaris m. SEMG, the motor of control two degrees of freedom EMG-controlling prosthetic hand is done and is bent the wrist action; The SEMG of extensor digitorum is weak, extensor carpi ulnaris m. SEMG weak, a little less than the flexor carpi ulnaris m. SEMG, do evil through another person and be failure to actuate.
The strong and weak evaluation algorithm of SEMG can be by to the adding up of SEMG amplitude, or absolute value adds up, or method such as variance size is judged that effectively these methods all are existing conventional method (for example using in the control of single-degree-of-freedom EMG-controlling prosthetic hand).
The hand multi-locomotion mode identification that the present invention is based on SEMG is to realize by the signal power of judging SEMG, the accuracy of identification reaches 100%, action control is reliable, avoid the multi-freedom degree muscle-electric artificial hand of conventional commercial need be by switching the situation just can reach the control of multiple freedom degrees hand-prosthesis, realized the do evil through another person real-time control of four actions of two degrees of freedom under the highly reliable discrimination, the bionical ability of multiple freedom degrees hand-prosthesis control is greatly improved.
Description of drawings
Fig. 1 is the structural representation of apparatus of the present invention;
Fig. 2 is for picking up the structure chart of electric transducer among Fig. 1.
The specific embodiment
With reference to the description of drawings embodiments of the present invention.
The present invention as depicted in figs. 1 and 2, two degrees of freedom EMG-controlling prosthetic hand real-time control apparatus comprises that three myoelectricities at extensor carpi ulnaris m., flexor carpi ulnaris m., the extensor digitorum pairing skin surface place that is positioned over the residual arm of people with disability respectively pick up electric transducer 1.Each myoelectricity picks up 8, three power-collecting electrodes 7 of elementary amplifying circuit that electric transducer 1 comprises three power-collecting electrodes 7 and the localityization that is connected with power-collecting electrode 7 signals and is respectively anelectrode, negative electrode and ground electrode.Power-collecting electrode 7, elementary amplifying circuit 8 that myoelectricity picks up electric transducer 1 structurally are incorporate, power-collecting electrode 7 is rectangle gold plated copper electrodes, its size and shape is with conventional to be applied to the electrode that SEMG picks up the same, elementary amplifying circuit 8 adopts conventional instrumentation amplifier, elementary amplifying circuit 8 places after the power-collecting electrode, is packaged together by a plastic casing.Elementary amplifying circuit 8 and the power-collecting electrode 7 integrated signal to noise ratios that help improving SEMG.The outfan of three elementary amplifying circuits 8 connects with the input of corresponding back level amplification filtering circuit 2 respectively, and the outfan of level amplification filtering circuit 2 is connected with the input of A/D change-over circuit 3 after three.Two motors 6 of two degrees of freedom EMG-controlling prosthetic hand connect with corresponding drive circuit 5 respectively.Single-chip microcomputer 4 is connected with the outfan of A/D change-over circuit 3, the input end signal of drive circuit 5 respectively.The drive circuit 5 of the back level amplification filtering circuit 2 in this device, A/D change-over circuit 3, single-chip microcomputer 4, motor all adopts existing single-degree-of-freedom EMG-controlling prosthetic hand corresponding devices.
By myoelectricity pick up SEMG that electric transducer 1 picks up through amplifying circuit, Filtering Processing circuit, the collection of A/D translation data, single-chip microcomputer finish the opening of the motion of doing evil through another person, close up, wrist is stretched, wrist is bent four action pattern state recognition algorithms, and do evil through another person according to the action pattern information-driven that obtains, reach the do evil through another person control of corresponding four actions of two degrees of freedom.Form one and have the bionical neural EMG-controlling prosthetic hand of two degrees of freedom that a kind of like this control approach of control motor was handled and controlled → do evil through another person to brain → nerve → forearm muscle → surface electromyogram signal → single-chip machine information.
In the work of two degrees of freedom EMG-controlling prosthetic hand, the power of three road SEMG and the corresponding relation of doing evil through another person between action pattern are as shown in table 1, and it has reflected a kind of determination methods, are exactly in fact aforementioned SCM Based four action pattern state recognitions.Open, close up, wrist is stretched, wrist is bent four action pattern state recognition algorithms and meant different strong, the weak combination by three road SEMG of extensor carpi ulnaris m., flexor carpi ulnaris m., extensor digitorum's correspondence, obtain doing evil through another person open, close up, wrist is stretched, wrist is bent four action pattern status informations.The corresponding relation such as the table 1 of the strong and weak combination of three road SEMG and four actions:
The strong and weak composite type of signal Surface electromyogram signal (SEMG) Recognition result
Extensor carpi ulnaris m. Flexor carpi ulnaris m. Extensor digitorum
1 By force A little less than - Stretch wrist
2 A little less than By force - Bend wrist
3 By force By force - Close up
4 A little less than A little less than By force Open
5 A little less than A little less than A little less than Attonity
Table 1
Work process is described:
When the people with disability who wears the two degrees of freedom EMG-controlling prosthetic hand needs the artificial hand controlled action, because the phantom limb sense that the people with disability had, only need as being intended to control, healthy people finish corresponding action, EMG-controlling prosthetic hand will be according to three road SEMG of corresponding hand motion, on judgement, base of recognition, artificial hand controlled is finished corresponding action: turn over sports consciousness on the wrist, do evil through another person and finish wrist synchronously and stretch action; Turn over sports consciousness under the wrist, do evil through another person and finish wrist action in the wrong synchronously; The five fingers stretching consciousness, the hand of doing evil through another person opens; The sports consciousness of clenching fist, the hand of doing evil through another person closes up; Hand loosens consciousness, does evil through another person and does not do any action.Avoid the multi-freedom degree muscle-electric artificial hand of conventional commercial need be, realized the do evil through another person real-time control of four actions of two degrees of freedom by switching the situation just can reach the control of multiple freedom degrees hand-prosthesis.

Claims (2)

1、二自由度肌电假手实时控制装置,其特征在于该装置包括三个肌电拾电传感器,每个肌电拾电传感器包括三个拾电电极和与拾电电极信号连接的当地化的初级放大电路,三个拾电电极分别为正电极、负电极和地电极;三个初级放大电路的输出端分别与对应的后级放大滤波电路的输入端连接,三个后级放大滤波电路的输出端与A/D转换电路的输入端连接;二自由度肌电假手的两个电机分别与对应的驱动电路连接,单片机分别与A/D转换电路的输出端、驱动电路的输入端信号连接。1. The two-degree-of-freedom myoelectric prosthetic hand real-time control device is characterized in that the device includes three myoelectric pick-up sensors, and each myoelectric pick-up sensor includes three pick-up electrodes and localized electrodes connected to the pick-up electrode signal. The primary amplifier circuit, the three pick-up electrodes are positive electrode, negative electrode and ground electrode; the output terminals of the three primary amplifier circuits are respectively connected to the input terminals of the corresponding post-stage amplifier filter circuits, and the three post-stage amplifier filter circuits The output end is connected to the input end of the A/D conversion circuit; the two motors of the two-degree-of-freedom myoelectric prosthetic hand are respectively connected to the corresponding drive circuit, and the single-chip microcomputer is respectively connected to the output end of the A/D conversion circuit and the input end signal of the drive circuit . 2、权利要求1所述的二自由度肌电假手实时控制装置的控制方法,其特征在于将三个肌电拾电传感器分别放置于残疾人残臂的尺侧腕伸肌、尺侧腕屈肌、指伸肌所对应的皮肤表面处,三个肌电拾电传感器分别采集来自人体的尺侧腕伸肌、尺侧腕屈肌和指伸肌对应的表面肌电信号,经过放大、滤波、A/D转换处理后输入单片机中;单片机对表面肌电信号强弱进行判断,并输出四路控制信号,经驱动电路带动二自由度肌电假手的电机,完成二自由度肌电假手的四个动作;2. The control method of the two-degree-of-freedom myoelectric prosthetic hand real-time control device according to claim 1, characterized in that three myoelectric pickup sensors are respectively placed on the extensor carpi ulnaris and the flexor carpi ulnaris of the disabled arm. At the skin surface corresponding to muscle and finger extensor, three EMG pick-up sensors respectively collect the surface EMG signals corresponding to the extensor carpi ulnaris, flexor carpi ulnaris and finger extensor from the human body, and then amplify and filter , A/D conversion and input into the single-chip microcomputer; the single-chip microcomputer judges the strength of the surface myoelectric signal, and outputs four control signals, and drives the motor of the two-degree-of-freedom myoelectric prosthetic hand through the driving circuit to complete the two-degree-of-freedom myoelectric prosthetic hand. four actions; 所述的单片机对表面肌电信号强弱判断是通过尺侧腕伸肌、尺侧腕屈肌、指伸肌对应的三路表面肌电信号的强弱组合,控制假手张开、合拢、腕伸、腕屈四个动作;具体地,三路表面肌电信号强弱组合与四个动作的对应关系是:指伸肌表面肌电信号强,控制二自由度肌电假手的电机,假手张开;尺侧腕伸肌表面肌电信号强、尺侧腕屈肌表面肌电信号强,控制二自由度肌电假手的电机,假手合拢;尺侧腕伸肌表面肌电信号强、尺侧腕屈肌表面肌电信号弱,控制二自由度肌电假手的电机,做伸腕动作;尺侧腕屈肌表面肌电信号强、尺侧腕伸肌表面肌电信号弱,控制二自由度肌电假手的电机,做屈腕动作;指伸肌表面肌电信号弱、尺侧腕伸肌表面肌电信号弱、尺侧腕屈肌表面肌电信号弱,假手不动作。The single-chip microcomputer judges the strength of the surface electromyography signal by combining the strength of the three-way surface electromyography signals corresponding to the extensor carpi ulnaris, flexor carpi ulnaris, and finger extensors to control the opening, closing, and wrist of the artificial hand. The four movements of stretching and wrist flexion; specifically, the corresponding relationship between the strength of the three-way surface EMG signal and the four movements is: the surface EMG signal of the finger extensor muscle is strong, the motor controlling the two-degree-of-freedom EMG prosthetic hand, the artificial hand stretching On; the surface EMG signal of the extensor carpi ulnaris is strong, the surface EMG signal of the flexor carpi ulnaris is strong, the motor of the two-degree-of-freedom myoelectric prosthetic hand is controlled, and the prosthetic hand is closed; the surface EMG signal of the extensor carpi ulnaris is strong, and the ulnar side The surface EMG signal of the wrist flexor muscle is weak, and the motor of the two-degree-of-freedom myoelectric prosthetic hand is controlled to perform wrist extension; the surface EMG signal of the wrist flexor muscle is strong, and the surface EMG signal of the wrist extensor muscle is weak, and the two-degree-of-freedom is controlled The motor of the myoelectric prosthetic hand performs wrist flexion; the surface EMG signal of the finger extensor muscles, the surface EMG signal of the extensor carpi ulnaris muscle is weak, and the surface EMG signal of the flexor carpi ulnaris muscle is weak, and the prosthetic hand does not move.
CNB2007100682195A 2007-04-24 2007-04-24 Two-degree-of-freedom myoelectric prosthetic hand real-time control device and control method Expired - Fee Related CN100515366C (en)

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CN107463259B (en) * 2017-08-07 2021-03-16 北京汽车集团有限公司 Vehicle-mounted display equipment and interaction method and device for vehicle-mounted display equipment
CN109419575A (en) * 2017-08-29 2019-03-05 上海科生假肢有限公司 The innovation control method of myoelectrically controlled hand
CN109419575B (en) * 2017-08-29 2023-06-16 上海科生假肢有限公司 Innovative control method of myoelectric control artificial hand
CN108309293A (en) * 2018-02-05 2018-07-24 郭海燕 A kind of piezoelectricity flexible sensing device
CN110946577A (en) * 2019-12-03 2020-04-03 南京航空航天大学 Flexible circuit board device for collecting arm electromyographic signals
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