Otto Bock 8E38 8 Series Instructions For Use Manual page 40

Opening: Proportional. The opening speed is determined by the speed and strength of the
muscle contraction.
Closing: Proportional. The closing speed is determined by the speed and strength with
which the muscles are relaxed. The gripping force is approx. 10 N.
Stopping: Relaxing the muscles very slowly via the electrode causes the hand to stop in the
open position.
Electrode 2
Gripping: The build-up of the gripping force is determined by the level of the muscle signal
on the second electrode. The maximum gripping force is approx. 100 N.
Example 1: After opening, relax the muscle at any speed. Closing is proportional to the speed
of muscle relaxation. The object is grasped with the minimum gripping force
(10 N). FlexiGrip takes effect starting at 20 N. When there is no longer a load, the
SensorHand Speed grips again with the minimum gripping force.
Example 2: After grasping as in example 1, the object is to be gripped with a higher gripping
force. To do so, produce a muscle signal on the second electrode. A gripping
force between 10 N and 100 N can be built up proportionally. When the position
of the gripped object changes, the gripping force is increased by up to approx. 1.5
times the specified gripping force. FlexiGrip takes effect at about twice the value
of the specified gripping force up to max. 130 N; when there is no longer a load,
the SensorHand Speed grips again with the original gripping force.
Open
Via speed and strength of the muscle contrac­
tion on electrode 1
Speed:
Proportional, 15 mm/s to 300 mm/s
Initial gripping force
10 N
Proportional: 10 N to 100 N
6.3.2.6 Program 6: DMC plus Sensorik, can be deactivated
Control with two electrodes
This control variant corresponds to program 1, but the "SUVA sensors" and FlexiGrip function
can be temporarily deactivated.
Activating and deactivating the "SUVA sensors" and FlexiGrip function
The "SUVA sensors" can be deactivated for gripping very soft and pliable objects, such as very
soft foams or tweezers. To do so, open the SensorHand Speed to the stop and keep it open with
a muscle signal at any level. At the same time, apply some pressure to the "SUVA sensors" (Fig.
1), e.g. by pushing on the edge of a table. A short vibration signal confirms deactivation. Repeat
the same process to activate the "SUVA sensors". Two short vibration signals confirm activation
40
Close
Via speed and strength of muscle relaxation on
electrode 1
Speed:
Proportional, 15 mm/s to 300 mm/s
Build-up of gripping force: Gripping force
depending on the level of the muscle signal on
electrode 2. Gripping force: Proportional, 10 N
to 100 N
Automatic gripping force
readjustment
During closing: No gripping
force readjustment
During build-up of gripping
force: Proportional, up to max.
1.5 times the initial gripping
force
FlexiGrip function
From 20 N depending on the
initial gripping force, takes
effect slightly above the max­
imum gripping force readjust­
ment in each case
Min. from 20 N
Max. from 130 N