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The electromyographic signal used for control of upper extremity prostheses and for quantification of motor blockade during epidural anaesthesia
Linköping University, Department of Biomedical Engineering. Linköping University, The Institute of Technology.
1987 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

A contribution of biomedical research engineering has been the development of detection and analysis methods for the electromyographic (EMG) signal and its application to health care problems. The present thesis describes the use of EMG signals for two such applications: Aid in the control of multifunctional upper limb prostheses and for quantification of motor blockade during epidural anaesthesia. A myoelectric control system operated by synergies from the EMG signals generated by two muscles is presented in papers I, II, and III. Results from paper I suggest that microprocessor based control systems for upper extremity prostheses could emulate all previous controllers based on discrete components. The study presented in paper II includes a graphic presentation of the EMG signal to this computer based control system and a visualization of the control algorithm and prosthetic movement. A series of single subject case studies of amputees showed successful operation of the prosthesis using the described system. Paper III presents a method for the quantification of success rate and response time for multiple-state control systems when applied to a group of non-disabled volunteers. Results showed that an increase in complexity of the control system was correlated to a decrease in performance. A prosthesis with four myoelectrically controlled joint movements was shown to be operable with a mean control accuracy of 53 percent subsequent to introductory training. In paper IV a presentation is made of the relationships between the isometric force exerted by the biceps brachii and six different quantities of the EMG simultaneously detected with bipolar surface and concentric needle electrodes. Results implied that amplitude sensitive parameters may be the best descriptors of isometric force from 0 to 100 percent of maximal voluntary contraction. In addition it was shown that bipolar surface electrodes may be superior to concentric needle electrodes for detection of EMG as a substitute measure of force. Paper V describes the use of EMG signals as a method for quantifying motor blockade during epidural anaesthesia. Surface EMG was detected from muscles with innervations from spinal levels T7, T9, T11 and L2-L4. Quantification of the recorded EMG during onset, duration and regression of anaesthesia appeared to enable quantitative mapping of both the temporal and spatial motor blockade behavior of the drug used in epidural anaesthesia.

It is concluded that the applications of detected and quantified EMG signals as presented in this thesis may lead to improvements both in the areas of prosthesis operation for amputees and for detection of motor blockade during epidural anaesthesia.

Place, publisher, year, edition, pages
Vimmerby: VTT Grafiska , 1987. , 48 p.
Linköping Studies in Science and Technology. Dissertations, ISSN 0345-7524 ; 172
National Category
Medical and Health Sciences
URN: urn:nbn:se:liu:diva-30192Local ID: 15683ISBN: 91-7870-228-3OAI: diva2:251014
Public defence
1987-11-27, Seminariesalen, Hälsouniversitetets bibliotek, Linköping, 09:00 (Swedish)

Papers, included in the Ph.D. thesis, are not registered and included in the posts from 1999 and backwards.

Available from: 2009-10-09 Created: 2009-10-09 Last updated: 2013-01-17

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