Experiences in the Creation of an          Electromyography Database       to Help Hand Amputated PersonsManfredo Atzori, ...
Overview•   EMG and prosthetics•   Motivations and goals•   Acquisition setup and sensors•   Hand movements•   Results    ...
Electromyography• Electromyography (EMG) is the  measurement of electrical activity  that is created by muscle contraction...
EMG controlled prosthetics•   2-3 degrees of freedom•   Few programmed movements•   Very coarse force control•   No dexter...
Motivation for the work• NO large scale public sEMG databases, only  private ones  – (Fukuda, 2003; Tsuji 1993; Ferguson, ...
Goals•   Creation and refinement of an acquisition protocol•   Acquisition of a database•   Public release of the database...
Acquisition setup      • Laptop: Dell Latitude E5520      • Digital Acquisition Card: National        Instruments 6023E   ...
Sensor setup•   8 equally spaced electrodes•   2 electrodes on finger flexor and extensor muscles•   Two axes inclinometer...
Hand movementsTraining                   Hato, 2004Exercise 1         Sebelius, 200512 movements                   Farrel,...
More movementsExercise 323 movements                             Feix, 2008   DASH ScoreObjects are simple tools to maketh...
Web-based database (http://ninapro.hevs.ch/)                                               11
Data stored• XML file with clinical and experimental information• Unprocessed data (sEMG, Cyberglove,  Inclinometer, Movie...
Electrode experiences• Double differential potential   – Good signal to noise ratio• Excellent comfort (no cleaning/  shav...
Two types of electrodes tested• Otto Bock 13E200  – Root mean square rectification  – High pass filtering  – Sampling freq...
Acquisition experiences (amputated)• Dry the stump before the experiment• Need of longer breaks between the exercises• Mod...
Acquisition experience (non amputated)• Difficulty to place electrodes exactly in the same  position for subjects   – Need...
Conclusions• Test and improvement of the acquisition setup  – Portable, based on research and industrial needs• Test and i...
Questions, contacts?• For more information:• http://www.idiap.ch/project/ninapro/• http://ninapro.hevs.ch• Contacts:• manf...
Upcoming SlideShare
Loading in …5
×

Experiences in the Creation of an Electromyography Database to Help Hand Amputated Persons

1,366 views

Published on

Medical Informatics Europe - MIE 2012, Pisa, 26-29.08.2012

Published in: Technology, Business
0 Comments
0 Likes
Statistics
Notes
  • Be the first to comment

  • Be the first to like this

No Downloads
Views
Total views
1,366
On SlideShare
0
From Embeds
0
Number of Embeds
13
Actions
Shares
0
Downloads
26
Comments
0
Likes
0
Embeds 0
No embeds

No notes for slide

Experiences in the Creation of an Electromyography Database to Help Hand Amputated Persons

  1. 1. Experiences in the Creation of an Electromyography Database to Help Hand Amputated PersonsManfredo Atzori, Arjan Gijsberts, Simone Heynen, Anne-Gabrielle Mittaz Hager, Claudio Castellini, Barbara Caputo, Henning Müller
  2. 2. Overview• EMG and prosthetics• Motivations and goals• Acquisition setup and sensors• Hand movements• Results – Electrodes 2
  3. 3. Electromyography• Electromyography (EMG) is the measurement of electrical activity that is created by muscle contractions• The signal path – Originates in a motor neuron – Travels to the target muscle(s) – Starts a series of electrochemical changes that lead to an action potential – Can be detected by one or more electrodes 3
  4. 4. EMG controlled prosthetics• 2-3 degrees of freedom• Few programmed movements• Very coarse force control• No dexterous control• No natural control• Long training times• This is in contrast to recent advances in mechatronics! 4
  5. 5. Motivation for the work• NO large scale public sEMG databases, only private ones – (Fukuda, 2003; Tsuji 1993; Ferguson, 2002; Zecca, 2002; Chan, 2005; Sebelius, 2005; Castellini, 2008; Jiang, 2009; Tenore, 2009; Castellini, 2009)• NO common sEMG acquisition protocol• NO common sEMG storage protocol• NO Clinical Data Correlation Evaluation 5
  6. 6. Goals• Creation and refinement of an acquisition protocol• Acquisition of a database• Public release of the database• Worldwide test of classification algorithms using the same data and setup – Improve quality of classification – Transfer this knowledge to build better prostheses 6
  7. 7. Acquisition setup • Laptop: Dell Latitude E5520 • Digital Acquisition Card: National Instruments 6023E • sEMG Electrodes: 10 double-differential Otto Bock 13E200 • Printed Circuit Board, Cables & Connectors • Data Glove 22 sensors Cyberglove II (Cyberglove Systems) • Inclinometer: Kübler 8.IS40.2341 7
  8. 8. Sensor setup• 8 equally spaced electrodes• 2 electrodes on finger flexor and extensor muscles• Two axes inclinometer• Data glove 8
  9. 9. Hand movementsTraining Hato, 2004Exercise 1 Sebelius, 200512 movements Farrel, 2008 Crawford, 2005Exercise 217 movements 9
  10. 10. More movementsExercise 323 movements Feix, 2008 DASH ScoreObjects are simple tools to makethe protocol easy to reproduceeverywhere. 10
  11. 11. Web-based database (http://ninapro.hevs.ch/) 11
  12. 12. Data stored• XML file with clinical and experimental information• Unprocessed data (sEMG, Cyberglove, Inclinometer, Movie)• Preview picture for each exercise• Picture of the arm without the acquisition setup• Picture of the arm with the acquisition setup• Currently stored: 27 intact subjects, 1 amputated subject, several recordings for a few Gender 21 males 7 females Handedness 26 right handed 2 left handed Age 28.1 ± 3.4 years 12
  13. 13. Electrode experiences• Double differential potential – Good signal to noise ratio• Excellent comfort (no cleaning/ shaving)• Classification results in accordance with the scientific literature (~7-20%) 13
  14. 14. Two types of electrodes tested• Otto Bock 13E200 – Root mean square rectification – High pass filtering – Sampling frequency: 100 Hz L. F. Law et al., 2010• Delsys Trigno – Raw signal – Sampling frequency: 2KHz – Wi-fi L. F. Law et al., 2010 14
  15. 15. Acquisition experiences (amputated)• Dry the stump before the experiment• Need of longer breaks between the exercises• Modification of the instructions avoiding the concept of an imaginary limb• Elimination of a few movements from the protocol 15
  16. 16. Acquisition experience (non amputated)• Difficulty to place electrodes exactly in the same position for subjects – Need of spatial normalization as anatomy changes and positions are not 100% stable• Validation of the acquisition protocol with small changes – Function check of electrodes is required – System needs to limit artifacts caused by users• Removal of a few functional movements showing high inter subject differences 16
  17. 17. Conclusions• Test and improvement of the acquisition setup – Portable, based on research and industrial needs• Test and improvement of the acquisition protocol – Complete and easy to be reproduced – Fixed several practical aspects• Test and improvement of the hand movements – 52, selected from robotics and medical literature• Test of acquired sEMG signals (classification) – Good SNR ratio – Results in line with the scientific literature 17
  18. 18. Questions, contacts?• For more information:• http://www.idiap.ch/project/ninapro/• http://ninapro.hevs.ch• Contacts:• manfredo.atzori@gmail.com• henning.mueller@hevs.ch 18

×