Temporomandibular Joint Disorder (TMJD) Diagnostics System

Temporomandibular Joint Disorder (TMJD) Diagnostics System University of Connecticut Biomedical Engineering Senior Design Spring 2011 Michael Jorgense...
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Temporomandibular Joint Disorder (TMJD) Diagnostics System University of Connecticut Biomedical Engineering Senior Design Spring 2011 Michael Jorgensen Mariana Hu Kerry Semle

Overview  Introduction  Client background  Purpose of design project  General Overview of EMG

 Project overview  Neuroband Data Acquisition Unit  Circuit design  LabVIEW program

 Budget  Conclusion  Acknowledgements  References and Further Reading  Questions and comments

Client Background  Dr. Mark Litt, Ph.D.  Clinical Psychologist at the University of Connecticut Health Center  Expert in Temporomandibular Joint Disorder and chronic orofacial pain treatment methods  Research interests include:  Influence of Cognitions and Affects on Pain and Illness  Psychoneuroimmunology

Purpose of Design Project  Electromyography (EMG)  Detect bruxism (teeth clenching / grinding) events

 Reduce dependency on sleep lab diagnosis  Allow patients to be screened comfortably in their own home  Obtain data consistent with natural sleeping patterns

 Maintain accuracy and efficacy of sleep labs

 User-friendly  Patient  Clinician

 Improve screening and diagnosis of TMJD

General Overview of EMG  Electromyography (EMG)  Record electrical activity produced by skeletal muscles

 Facial muscles involved in TMJD  Left and Right Temporalis  Left and Right Masseter

Project Overview

Neuroband Data Acquisition Unit  Uses Dr. Diane’s Neuroband EEG headband  Ports for electrode snap leads located within chin strap and headband  Features 9 electrode leads:  Two disposable electrodes per muscle  One reference electrode located on the patient’s forehead

Circuit Design Circuit requirements  Amplify EMG signals  High input impedance  High CMRR  Patient protection circuitry  Size consideration  Budget

Circuit Flowchart

Schematic (one circuit)

Printed Circuit Board  ExpressPCB Software  Four Layer PCB

Circuit Enclosure

Circuit Enclosure (cont.)

LabVIEW Program Flowcharts EMG


Select muscle

Selec file

Read from file

Rectify EMG



LabVIEW Program Flowcharts

Start DAQ = TRUE

Data Acquisition

Data > Threshold?

Split signal


Extract Portion of Signal

Write to file


LabVIEW Program (cont.)  Clinician’s Front Panel for viewing EMG:  Select muscle using tabs  Select file to view  Adjust speed

LabVIEW Program (cont.)  Clinician’s Front Panel for setting threshold for EMG data storage

LabVIEW Program (cont.)  Patient’s Front Panel to begin and stop data acquisition  LED Indicates signal acquisition started

Budget and Total Cost Device Cost (each): Component










Neuroband Components








 Total allotment: $6,000  Prototyping cost: $2,451.07  Remaining allocation: $3,548.93

Conclusion  The product works!      

Portable User friendly Data acquisition unit acquires signals Circuitry filters data LabVIEW program analyzes, stores, and displays data LabVIEW program will work on any Microsoft Windows computer

 We were significantly under budget

Acknowledgments  Dr. Mark Litt, Ph.D.  Dr. John Enderle, Ph.D.  Emily Jacobs  Marek Wartenberg  Dave Kaputa  Sonia Helena Contreras Ortiz  Antonio Costa  Penny Dobbins

References and Further Reading  Cram, Jeffrey. Introduction to Surface Electromyography. 1st. Jones & Bartlett Publishers, 1998. Print.  Crider, Andrew, Alan G. Glaros, and Richard N. Gevirtz. "Efficacy of Biofeedback-Based Treatments for Temporomandibular Disorders." Applied Psychophysiology and Biofeedback 30.4 (2005): 33345. Print.  Doering, S., J. A. Boeckmann, S. Hugger, and P. Young. "Ambulatory Polysymnography for the Assessment of Sleep Bruxism." Journal of Oral Rehabilitation 35 (2008): 572-76. Print.  Galaros, A. G., Z. Owais, and L. Lausten. "Reduction in Parafunctional Activity: a Potential Mechanism for the Effectiveness of Splint Therapy." Journal of Oral Rehabilitation 34 (2007): 97104. Print.  Galaros, Alan G., Karen Williams, and Leonard Lausten. "Diurinal Variation in Pain Reports in Temporomandibular Disorder Patients and Control Subjects." Journal of Orofacial Pain 22.2 (2008): 115-21. Print.  Gallo, Luigi M., Gilles Lavigne, Pierre Rompre, and Sandro Palla. "Reliability of Scoring EMG Orofacial Events: Polysymnography Compared with Ambulatory Recordings." European Sleep Research Society 6 (1997): 259-63. Print.  Kato, Takafumi, Norman M. Thie, Jacques Y. Montplaisir, and Gilles J. Lavigne. "Bruxism and Orofacial Movements During Sleep." Dental Clinics of North America 45.4 (2001): 657-84. Print.  Philips Semiconductor, "UART to Bluetooth Interfacing." NXP Semiconductors. Philips 43  Kraus, Steven. Temporomandibular Disorders. 2nd ed. New York, NY: Churchill Livingstone Inc., 1994. Print.  Robertson, Gordon. “Electromyography: Processing.” University of Ottawa, 05, 11 2007. Web. Apr 2011. www.health.uottawa.ca/biomech/courses/apa4311/emg-p2.pps.  Webster, John. Medical Instrumentation Application and Design. 2nd ed. Boston, MA: Houghton Mifflin Company, 1992. Print.

Questions and Comments

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