Patent
1976-02-09
1977-06-21
Frinks, Ronald L.
A61F 100, A61F 106
Patent
active
040301419
ABSTRACT:
This invention relates to an improved EMG-based method for actuating a prosthetic appliance wherein a single pair of electrodes may be used to actuate several artificial limb movements by way of sampling and repeatedly resampling substantially the entire time function of the myoelectric signal as it appears on the limb stump over a period so short that the signal remains quasi-stationary, comparing a minimum number of parameters of such signals with a range of values of these same parameters stored within the data bank of a microcomputer, and actuating one or more functions of a prosthetic appliance whenever the current data for the sampled parameters all falls within a preselected domain chosen on the basis of the historical data. This invention also encompasses the apparatus for using the EMG signals developed by the patient in the stump for controlling the movements of a prosthetic appliance which comprise means connected to process the EMG signals so as to differentiate between the various functions to be performed thereby based upon a minimum number of parameters of said signals, means for storing historical data concerning the range of values said parameters vary over for each function, means for repeatedly sampling current data on said parameters and comparing same with the stored data during a brief time interval, and means operative to initiate one or more functions whenever the current data on the chosen parameters falls within an arbitrary domain chosen on the basis of said historical data.
REFERENCES:
patent: 3491378 (1970-01-01), Ioffe et al.
patent: 3735425 (1973-05-01), Hoshall et al.
"Statistical Analysis of Myoelectric Potentials in Man" by G. W. Lange et al., The Basic Problems of Prehension, Movement, and Control of Artificial Limbs, Proceeding the Institution of Mechanical Engineers, vol. 183, Part 3J, 1968-1969, pp. 135-140.
"A Study of Myo-Electric Signals for Arm Prosthesis Control" by D. Bousso et al., Bio-Medical Engineering, vol. 6, No. 11, Nov. 1971, pp. 509-516.
Frinks Ronald L.
Spangler, Jr. Edwin L.
The United States of America as represented by the Veterans
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