Otto Bock MyoHand VariPlus Speed 8E38-9, Manual, Page: 38 / 184

38 | Ottobock
Closing:
Proportional. The closing speed is determined by the speed and amount of the muscle relaxation.
Stopping:
By very slow muscle relaxation to the electrode, the hand stops in an opened position.
Electrode 2:
Grasping:
The level of the muscle signal to the second electrode determines the build-up of the grip
force.
Example 1: After opening the hand, the patient relaxes the muscle at any speed. The hand closes propor-
tionally to the speed of the muscle relaxation. The object is grasped with minimal force.
Example 2: After grasping as described in example 1, the hand shall grasp the object with a higher grip
force. For this purpose, the amputee must create an electrode signal to the second electrode.
Proportionally, a grip force of up to approx. 100 N can be built up.
Control Mode 4: VarioDual: Two electrodes
Opening Closing
Increasing electrode signal through muscle contrac-
tion to the first electrode
Declining electrode signal through muscle relaxation
to the first electrode
Grip force:
Proportional to the signal strength to the
second electrode
Gripping once more with maximum force to the 2nd
electrode prevents the hand from opening due to
unintentional electrode signals.
Speed:
Proportional
Speed:
Proportional
Control Mode 5: DigitalControl
Requires: 2 electrodes,
1 electrode and 1 switch or
1 switch
The hand closes at constant speed, and the grip force increases proportionally to the duration of gripping.
Control with two electrodes
Opening:
Digital. Controlled by the OPENING electrode. The hand opens at constant speed.
Closing:
Digital. Controlled by the CLOSING electrode. The hand closes at constant speed.
Control Mode 5: DigitalControl: Two electrodes
Opening Closing
Sustained electrode signal Sustained electrode signal
Grip force:
Depends on the duration of the signal
Speed:
Constant
Speed:
Constant
Control with one electrode and one switch
Opening:
Electrode signal to the OPENING electrode.
Closing:
Signal from the switch The hand closes at constant speed.