CN103142235B - Magnetic positioning gait analysis system - Google Patents

Magnetic positioning gait analysis system Download PDF

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Publication number
CN103142235B
CN103142235B CN201310073826.6A CN201310073826A CN103142235B CN 103142235 B CN103142235 B CN 103142235B CN 201310073826 A CN201310073826 A CN 201310073826A CN 103142235 B CN103142235 B CN 103142235B
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magnetic
circuit
signal processor
signal
gait analysis
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CN103142235A (en
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吴小玲
王延花
彭唯唯
王旋
敦煌俊秋
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Nanjing University
Nanjing Medical University
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Nanjing Medical University
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Abstract

The invention discloses a magnetic positioning gait analysis system, which comprises a magnetic induction detector (1), a signal conditioner (2), an MCU (microcontroller unit) (3), an upper computer, a magnetic source and a power supply module, wherein the magnetic induction detector (1) comprises a triaxial magnetic sensor array (4) and a calibration circuit (5); the triaxial magnetic sensor array (4) calibrated by the calibration circuit (5) receives magnetic field signals around the magnetic source; the signal conditioner (2) comprises an analog signal processor (5) and a digital signal processor (6); the analog signal processor (5) comprises a signal pre-processing circuit and a low pass filter circuit, magnifies and filters output signals of the magnetic induction detector (1), and uses a second order Butterworth low pass filter for filtering out external high frequency magnetic-field interference; the digital signal processor (6) comprises an A/D (analog to digital) conversion circuit; the MCU (3) comprises a square wave generator (7) and an RS232 serial communication circuit (8), square wave signals generated by the square wave generator (7) are transmitted to the calibration circuit and taken as calibrating signals, and the RS232 serial communication circuit (8) transmits digital signals output by the digital signal processor (6) to the upper computer; and the power supply module is used for supplying power.

Description

Magnetic orientation gait analysis system
Technical field
The present invention relates to a kind of magnetic detection technique of utilizing, the Converse solved space coordinates that goes out to stick on human body shank magnetic source, thus obtain gait feature parameter in human motion process.The invention belongs to the gait analysis technical field in biomedical engineering.
Background technology
Walking is in human body daily life, to repeat maximum a kind of globality motions.Health each several part when the development of modern surveying technology is likely walked us to the mankind, particularly the motion of lower limb and stressing conditions carry out dynamic quantification analysis, this work develops into a special branch of biomechanics gradually, and is named as gait analysis (gait analysis).
Gait analysis can be used for the action of general normal person's a gait cycle of advancing and resolves, more being common in the effective means of clinically walking-function being carried out system evaluation, is the important component part (as instructed rehabilitation and rehabilitation assessment after apoplexy) of rehabilitation evaluation.Present stage, gait analysis was clinically divided into: ocular estimate and instrument measuring method.First method is observed patient's walking process by the method for range estimation by medical worker, then, according to gained impression or the result evaluated item by item according to certain observation item, rely on its abundant clinical experience to draw preliminary analysis conclusion.Ocular estimate can only be qualitative, can not be quantitative.Second method is by apparatus measures, for objective evaluation provides a kind of accurately effective means.Conventional analysis mode has at present: 1. Synchronous camera analysis.Walking channel at 4~8m arranges 2~6 video cameras around, records experimenter's walking image simultaneously, and adopts the mode of synchronously putting slowly, by experimenter's decomposition of movement observation and analysis.2. 3-dimensional digital fractional analysis.While obtaining continuously experimenter's walking by 2~6 detectors (digital detecting instrument or special video camera), the signal of joint marker thing, is converted to digital signal by computer, analyzes experimenter's three-dimensional motion feature.3. joint angles score is analysed.Adopt special joint angles meter to be fixed on tested joint, record the Angulation changes of joint motion, be converted to digital signal and use computer reconstruction gait.Although these modes are accurate, desirable, need to purchase expensive equipment, data volume is large and the installation environment of equipment is proposed to high requirement.Though some hospital has purchased expensive equipment according to the survey, equipment is usually in idle state, still relies on doctor's range estimation diagnose the assessment with rehabilitation.
Summary of the invention
Technical problem to be solved: for high to environmental requirement in prior art, data processing amount is large, and apparatus expensive etc., the present invention proposes a kind of gait analysis system based on magnetic orientation.
Technical scheme: the invention provides a kind of magnetic orientation gait analysis system for above deficiency, it is characterized in that: comprise that magnetic induction measurement device, signal conditioner, MCU controller, host computer, magnetic source are measurand, supply module;
Magnetic induction measurement device comprises magnetic sensor array and calibration circuit, the field signal around of the magnetic sensor array received magnetic source after calibration circuit calibration;
Signal conditioner comprises analogue signal processor and digital signal processor; Analogue signal processor comprises signal pre-processing circuit and low-pass filter circuit, analogue signal processor by the output signal of magnetic induction measurement device amplify, Filtering Processing, analogue signal processor utilizes the extraneous high frequency magnetic field of second order Butterworth LPF filtering to disturb; Described digital signal processor comprises A/D change-over circuit, and the output signal of analogue signal processor is carried out to A/D conversion;
MCU controller comprises square-wave generator and RS232 serial communication circuit, the square-wave signal that square-wave generator produces flows to calibration circuit as calibrating signal, and RS232 serial communication circuit is sent to host computer by the digital signal of digital signal processor output through RS232 serial communication circuit;
Supply module is for power supply.
Described A/D change-over circuit, adopts 16 A/D converters of high-performance multichannel, and analogue signal is converted to digital signal.
Described host computer refers to install the PC of LABVIEW Virtual Instrument Development software, utilize LabVIEW Virtual Instrument Development software to programme and receive the data that RS232 serial communication circuit transmits, and to magnetic source real-time positioning and demonstration, by data storing, be text simultaneously.
Described magnetic source is small magnet, and the quantity of small magnet is 3 or 6.
It is 3.3V that described calibration circuit produces square-wave signal amplitude by MCU controller, after 74HCT04 phase inverter, amplitude is risen to 5V, recycling resistance capacitance and diode carry out the adjustment of dutycycle, signal after adjustment is exported the spike of alternate positive and negative after IRF7106, this pulse signal magnetizes magnetic sensor array, makes it return to initial easy axis.
Described magnetic orientation gait analysis system also comprises two switches; Whether one is power switch, control the components and parts of whole system and work, and another is virtual switch, is positioned at the human-computer interaction interface of Virtual Instrument Development, controls and when starts data acquisition and processing.
Beneficial effect: magnetic orientation gait analysis system provided by the invention is just can realize comprehensive monitoring patient's situation by a kind of sensor, simple in structure, easy to operate, with low cost.
accompanying drawing explanation
Fig. 1 is the structured flowchart of magnetic orientation gait analysis system;
Fig. 2 is the concrete structure schematic diagram of magnetic orientation gait analysis system;
Fig. 3 is calibration circuit schematic diagram.
The specific embodiment
Below in conjunction with accompanying drawing, the present invention is done to further detailed description.
As shown in Figure 1, 2, 3, provided by the invention magnetic orientation gait analysis system, comprise magnetic induction measurement device, signal conditioner, MCU controller, host computer (PC), magnetic source (measurand), supply module.
magnetic induction measurement devicecomprise magnetic sensor array and calibration circuit, the field signal around of the magnetic sensor array received magnetic source after calibration circuit calibration.
signal conditionercomprise analogue signal processor and digital signal processor;
Described analogue signal processor comprises signal pre-processing circuit and low-pass filter circuit, analogue signal processor by the output signal of magnetic induction measurement device amplify, Filtering Processing, analogue signal processor utilizes the extraneous high frequency magnetic field of second order Butterworth LPF filtering to disturb;
Described digital signal processor comprises A/D change-over circuit, and the output signal of analogue signal processor is carried out to A/D conversion;
Described A/D change-over circuit, utilizes 16 A/D converters of high-performance multichannel, and analogue signal is converted to digital signal.
controllercomprise square-wave generator and RS232 serial communication circuit ,the square-wave signal that square-wave generator produces flows to calibration circuit as calibrating signal, and RS232 serial communication circuit is sent to host computer by the digital signal of digital signal processor output through RS232 serial communication circuit.
host computerrefer to install the PC of LABVIEW Virtual Instrument Development software, utilize LabVIEW Virtual Instrument Development software to programme and receive the data that RS232 serial communication circuit transmits, after the line parameter of going forward side by side calculating and Error Compensation Technology, realize magnetic source real-time positioning and demonstration, be text by data storing simultaneously.
magnetic sourcethe small magnet that comprises some, the quantity of small magnet is 3 or 6, is preferably 6, is placed in respectively leg joint place, left and right.
Whole system supply moduleby voltage changing module and Voltage stabilizing module, formed;
Described voltage changing module is by be converted to ± 12V of 220V alternating voltage changing voltage DC voltage;
Described Voltage stabilizing module by conversion after ± be converted to ± 5V of 12V DC voltage DC voltage, then by conversion after 5V DC voltage be converted to 3.3V voltage; Wherein ± 5V DC voltage is signal pre-processing circuit and low-pass filter circuit power supply; 3.3V is the power supply of MCU controller and the power supply of A/D change-over circuit;
It is 3.3V that described calibration circuit produces square-wave signal amplitude by MCU controller, after 74HCT04 phase inverter, amplitude is risen to 5V, recycling resistance capacitance and diode carry out the adjustment of dutycycle, signal after adjustment is exported the spike of alternate positive and negative after IRF7106, this pulse signal magnetizes magnetic sensor array, make it return to initial easy axis, improve output sensitivity.
System of the present invention, by the real-time demonstration to magnetic source, can be monitored from angle, amplitude and three aspects of frequency patient's actual foot situation, for diagnosis.
During concrete use system of the present invention, small magnet is positioned over respectively to femur, patella and fibula, three point-blank.
Described system comprises two switches; Whether one is power switch, control the components and parts of whole system and work, and another is virtual switch, is positioned at the human-computer interaction interface of Virtual Instrument Development, controls and when starts data acquisition and processing.
The foregoing is only the preferred embodiments of the present invention, be not restricted to the present invention, for a person skilled in the art, the present invention can have various modifications and variations.Within the spirit and principles in the present invention all, any modification of doing, be equal to replacement, improvement etc., within all should being included in claim scope of the present invention.

Claims (5)

1. a magnetic orientation gait analysis system, is characterized in that: comprise that magnetic induction measurement device, signal conditioner, MCU controller, host computer, magnetic source are measurand, supply module;
Magnetic induction measurement device comprises magnetic sensor array and calibration circuit, the field signal around of the magnetic sensor array received magnetic source after calibration circuit calibration;
Signal conditioner comprises analogue signal processor and digital signal processor; Analogue signal processor comprises signal pre-processing circuit and low-pass filter circuit, analogue signal processor by the output signal of magnetic induction measurement device amplify, Filtering Processing, analogue signal processor utilizes the extraneous high frequency magnetic field of second order Butterworth LPF filtering to disturb; Described digital signal processor comprises A/D change-over circuit, and the output signal of analogue signal processor is carried out to A/D conversion;
MCU controller comprises square-wave generator and RS232 serial communication circuit, the square-wave signal that square-wave generator produces flows to calibration circuit as calibrating signal, and RS232 serial communication circuit is sent to host computer by the digital signal of digital signal processor output through RS232 serial communication circuit;
Supply module is for power supply;
It is 3.3V that described calibration circuit produces square-wave signal amplitude by MCU controller, after 74HCT04 phase inverter, amplitude is risen to 5V, recycling resistance capacitance and diode carry out the adjustment of dutycycle, signal after adjustment is exported the spike of alternate positive and negative after IRF7106, this pulse signal magnetizes magnetic sensor array, makes it return to initial easy axis.
2. magnetic orientation gait analysis system according to claim 1, is characterized in that: described A/D change-over circuit, 16 A/D converters of employing high-performance multichannel, are converted to digital signal by analogue signal.
3. magnetic orientation gait analysis system according to claim 1, it is characterized in that: described host computer refers to install the PC of LABVIEW Virtual Instrument Development software, utilize LabVIEW Virtual Instrument Development software to programme and receive the data that RS232 serial communication circuit transmits, and to magnetic source real-time positioning and demonstration, by data storing, be text simultaneously.
4. magnetic orientation gait analysis system according to claim 1, is characterized in that: described magnetic source is small magnet, and the quantity of small magnet is 3 or 6.
5. magnetic orientation gait analysis system according to claim 1, is characterized in that: also comprise two switches; Whether one is power switch, control the components and parts of whole system and work, and another is virtual switch, is positioned at the human-computer interaction interface of Virtual Instrument Development, controls and when starts data acquisition and processing.
CN201310073826.6A 2013-03-08 2013-03-08 Magnetic positioning gait analysis system Active CN103142235B (en)

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CN105125216B (en) * 2015-08-29 2019-01-01 深圳市老年医学研究所 A kind of gait detecting system based on plantar pressure

Citations (7)

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US5325869A (en) * 1991-12-16 1994-07-05 Stokes Theodore J Apparatus for load and displacement sensing
US5807283A (en) * 1997-01-27 1998-09-15 Ng; Kim Kwee Activity monitor
CN2422938Y (en) * 2000-03-06 2001-03-14 郑红 Distribution-type electromagnetic human kinesis detection device
US6242907B1 (en) * 1999-02-24 2001-06-05 Graves Electronics Llc Apparatus and method of determining the orientation of an object relative to a magnetic field
CN102175244A (en) * 2011-03-16 2011-09-07 公安部沈阳消防研究所 In-building person positioning system and positioning method thereof based on inertial sensor
WO2012060578A2 (en) * 2010-11-02 2012-05-10 Lee Jin-Wook Outsole sheet for gait diagnosis, and footwear system for gait diagnosis and service system for gait posture diagnosis using same
CN203182909U (en) * 2013-03-08 2013-09-11 南京医科大学 Magnetic localization gait analysis system

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FR2926971B1 (en) * 2008-02-04 2011-02-25 Commissariat Energie Atomique MARKET ANALYSIS DEVICE

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5325869A (en) * 1991-12-16 1994-07-05 Stokes Theodore J Apparatus for load and displacement sensing
US5807283A (en) * 1997-01-27 1998-09-15 Ng; Kim Kwee Activity monitor
US6242907B1 (en) * 1999-02-24 2001-06-05 Graves Electronics Llc Apparatus and method of determining the orientation of an object relative to a magnetic field
CN2422938Y (en) * 2000-03-06 2001-03-14 郑红 Distribution-type electromagnetic human kinesis detection device
WO2012060578A2 (en) * 2010-11-02 2012-05-10 Lee Jin-Wook Outsole sheet for gait diagnosis, and footwear system for gait diagnosis and service system for gait posture diagnosis using same
CN102175244A (en) * 2011-03-16 2011-09-07 公安部沈阳消防研究所 In-building person positioning system and positioning method thereof based on inertial sensor
CN203182909U (en) * 2013-03-08 2013-09-11 南京医科大学 Magnetic localization gait analysis system

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