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System and method for multifunctional control of upper limb prosthesis via EMg signal identification

  • US 4,209,860 A
  • Filed: 02/13/1978
  • Issued: 07/01/1980
  • Est. Priority Date: 02/13/1978
  • Status: Expired due to Term
First Claim
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1. In a method for controlling the operation of an electrically powered prosthesis appliance that replaces an amputee'"'"'s missing limb which method includes calibration steps of picking up electromyographic (EMG) signals from the stump of or from at least one muscle close to the point of amputation of the missing limb, and processing the signals thus collected as to reduce same to a near minimum number of linear time-series model parameters effective to differentiate between each of the several functions performed by the missing limb from each other function thereof, and collecting historical data representative of each of the functions of the prosthesis appliance to be controlled for use as background data, the improvement comprising storing the parameters and the background data of each of the functions to be performed by the prosthetic appliance on the person of the amputee, collecting current EMG signals from the stump of the amputee or from at least one muscle close to the point of amputation and passing same simultaneously through several electronic networks having a common input and each having been adjusted by the stored time-series parameters relating to a different limb function as obtained during calibration, and comparing the current EMG signals collected with the outputs of each of said networks, and initiating a response in the prosthetic appliance corresponding to that network whose output over a predetermined time interval is closest to the collected EMG signals over the same time interval.

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