Measuring muscle activation via electronic potential, referred to as electromyography or EMG signal acquisition and analysis using instrumentation amplifier and gelled skin surface electrodes.

Name: Md. Tanvir HossainRoll: 09115410General Project Presentation1EMG signal acquisition & analysisEMG signal acquisition using instrumentation amplifier and gelled skin surface electrodes. Interfacing with PC through either Sound Card or Microcontroller.Analysis of the acquired signal for noise reduction or diagnosis.(??)22EMG IntroductionSmall electrical currents are generated by muscle fibers prior to the production of muscle force.This signal called the electromyogram (EMG) can be measured by applying conductive elements or electrodes to the skin surface.Surface EMG is the more common method of measurement.33EMG Signal

4Wide spread use of EMG5

Typical benefits of EMGAllows to directly look into the muscle.Allows measurement of muscular performance.Helps in decision making both before/after surgery.Documents treatment and training regimes.Helps patients to find and train their muscles.Allows analysis to improve sports activities.Detects muscle response in ergonomic studies.

6Existing Machines7

Existing Machines8Model NamePriceInformation SourceIs it possible to achieve similar system in low cost?EMGNCC Brand good quality Bio-feedback surface EMG machine$1,000 to More Than $1,500Reference 120,000 TK to Less Than 25,000 TK (??)ECGCardioTouch 3000 Interpretive EKG (PC Connecting Software Included)$1,745 to More Than $2,500Reference 222,000 TK to Less Than 28,000 TK (??)Reference 1: http://uk.alibaba.com/product/687814131-NCC-Brand-good-quality-Surface-EMG.htmlReference 2: http://www.medicaldevicedepot.com/CardioTouch-3000-Interpretive-EKG-p/bct-3000.htmThats Why In this project,EMG signal will be acquired and next the signal will be analyzed in such a way that it could easily be used for different post processing with the help of computer(s). This signal can be used to control video games, robot arms, exoskeletons, etc.This signal may also meet many the medical diagnostic needs.(??)9Multidisciplinary NatureThe proposed project has multidisciplinary nature as it combines the knowledge of Electronics, Computer Science & Engineering (CSE) and Medical Science.

At the moment, the project is focused on the 1st 2 disciplines directly.

If this part is successfully completed, the project would move on to the later 2 disciplines.10ElectronicsCSEMedical Science++ElectronicsCSEMedical Science++ElectronicsCSEMedical Science++Block Diagram(Circuit To Computer Via Sound Card)11EMG Amplifier DeviceComputer

PreamplifierRC FilterAmplifier With Bias AdjustmentSound CardA/D ConverterEMGCapture Program12Block Diagram(Circuit To Computer Via Microcontroller)EMG Amplifier DeviceComputer

PreamplifierRC FilterAmplifier With Bias AdjustmentEMGCapture ProgramMicrocontrollerA/D ConverterUSB InterfacingMicrocontrollerUSB OutletDefinitionsPreamplifier: Apreamplifier(preamp) is anelectronic amplifierthat prepares a small electricalsignalfor further amplification or processing.RC Filter: Aresistorcapacitor circuit(RC circuit), orRC filterorRC network.Amplifier Bias: A bias is a tendency of one sort or another.

13Signal Acquisition Circuit

Schematic diagram of the electromyographic (EMG) amplifier. E1 and E2,electrodes 1and2.14Reference: http://advan.physiology.org/content/31/2/242.fullReference: http://www.binghamsite.com/miscellaneous/portable-emg-amplifierEMG Electrode Placement &Raw EMG Signal15

Work Plan 16Oct, 12Nov, 12Dec, 12Jan, 13Feb, 13Mar, 13Apr, 13May, 13Jun, 13Jul, 13Aug, 13Background ReadingCircuit ChoosingGathering EquipmentsEMG Signal Acquisition Test Run On OscilloscopeOverall Decision MakingFinal InterfacingProgram Design On PCTodayCompleteIncompleteNot StartedRequirementsFor signal acquisition:INA128, 9V Batteries, Registers, Capacitors, EMG Electrodes, ECG/EMG Gel, Connecting Wires, etc.For interfacing with PC:Microphone or Mouth Piece Port Jack (where sound card is used on the acquired signal for post processing. A/D Conversion is done in the sound card where programming can also be applied).Microcontroller (PIC18F4550) With USB Interfacing (where the acquired signal will come onto the PC through the Microcontroller & its A/D Converter; here the digitized signal will be used for post processing).To work on PC:C/C#/Java/MatLab Programming Language. (PulseAudio API/Wavelet or Signal Processing Tool etc.)17Components18

Estimated Cost This system is being developed to promote Rural Area Health Care (RAHC) and thus an overall cost reduction, is one of the primary targets of the system. Necessary equipments & their cost,General Circuitry: Less Than 3,000 TKAdditional Equipments: Less Than 2,000 TKA General PC: 15,000 to 20,000 TKThus overall cost will be just less than 25,000 TK19Additional Application After properly acquiring the EMG signal, the resulting signal can be used,In controlling video games, robot arms, exoskeletons, prosthetics,Human Computer Interface (HCI) systems,Movement detection and in many other places.20Risk Factors21The risk factors, depending on which, the proposed project may change its course, are mainly related with the availability of some Components:OPA130, INA106, TL072ECG Electrodes, Noise Less EMG CablesEasy ECG/EMG Cable to PC Interfacing CircuitConclusionIf the project is successful,It may lead to the development of low cost medical instruments, It may contribute to facilitate health care (especially in rural areas),It may also contribute to other applications mentioned earlier.22AcknowledgementsSome of my classmates are supporting & helping me with this project. This contribution is not negligible.I am also getting help from various websites on the net. Some of them can be mentioned here.http://advan.physiology.org/content/31/2/242.fullhttp://www.binghamsite.com/miscellaneous/portable-emg-amplifier23Thank You24