A new way of myoelectric control MyoPro project

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A new way of myoelectric controlMyoPro project

• Daphne van Baal
• Hans Rietman, Laura Kallenberg
• 25 september 2009

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Introduction

• Low usage myoelectric prosthesis

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Goal

• Improve the control of
• a myoelectric forearm prosthesis
• by increasing the number of degrees of freedom
• using multi-channel surface electrodes

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Experimental protocol

• Ten healthy male subjects
• One forearm amputee
• Forty small electrodes in grid
• Eight isometric contractions

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Isometric contractions
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Data analysis

• Data selection of active contractions
• Time periods of 200 milliseconds
• Root mean squared (RMS) value
• Subject specific classification
• Simple robust classifier (kNN)

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RMS-level images
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Robust classifier
Training set
Test set
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Results
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Continuous results
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RMS-level images amputee
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Results amputee
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Conclusion

• Offline classification
• normally limbed 99.9
• amputee patient 99.6
• Online classification
• normally limbed 93.4
• Up to ten movements can be distinguished (five
  degrees of freedom)

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Future

• Validation more measurements with amputees
• Additional patient specific contractions
• Random-ordered contractions
• Simultaneous control of different contractions
• Force level analysis for proportional control

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Questions?
For more information www.myopro.nl