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- W143482787 abstract "The very Underlying Principle of Control for the Otto Bock Myoelectric System is “Muscle contraction should lead to function.” If you think about picking up an object with your sound hand, you simply pick up the object. An amputee must concentrate on more activities than that of an individual with a sound hand. If an amputee wears a prosthesis they must first open their hand, then position their hand over the object, then close their hand around the object and finally determine how much grip force should be applied to the object. With all of those things to consider, the relationship between their input signal (EMG) and the output of the hand (motor speed or grip force) must remain constant to minimize the learning curve. If the relationship is variable, the patient must relearn how to control the hand depending on the variables and thus control can be very unpredictable. The analogy is getting into someone’s car that just had a brake job done. You are used to putting high pressure on the pedal in your car in order to slow the car down so when you touch the pedal in the other car, it brakes very abruptly. You need to relearn the relationship between pedal pressure and braking speed. This is something we need to avoid in myoelectric fittings. Therefore, the microprocessor control in the Otto Bock system contains features to minimize the effects of outside influences. The outside influences include the following: Opening position: As the glove is stretched while the hand is opening, resistance to the motor is increased and without intervention would cause the hand to slow down. Battery Voltage: In the morning when the battery is fully charged, the hand runs at full speed. During the day the voltage of the battery slowly drops off and without intervention would cause the motor to run slower with the same signal (EMG) from the amputee. Temperature: Colder temperatures produce higher resistances to the motor than if the temperature were warmer. Without intervention the cold temperature could make the hand run slower. Aging glove: If a glove or inner hand shell is old and stiff, this again will produce high resistance to the motor. Without intervention the motor would run slower with an old stiff glove than with a new flexible glove. Normal wear and tear: As mechanical parts wear out they run less efficient putting higher resistance on the motor. Without intervention this would cause the motor to run slower. From “MEC '02 The Next Generation,” Proceedings of the 2002 MyoElectric Controls/Powered Prosthetics Symposium Fredericton, New Brunswick, Canada: August 21–23, 2002. Copyright University of New Brunswick." @default.
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- W143482787 date "2002-01-01" @default.
- W143482787 modified "2023-09-24" @default.
- W143482787 title "MICROPROCESSOR CONTROL FEATURES" @default.
- W143482787 hasPublicationYear "2002" @default.
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