Otto Bock 8E38 9 Instructions For Use Manual page 28

9.3 Control mode 3:
With this control mode, the opening speed is determined by the strength and speed of the muscle
contraction. The closing speed and grip force depend on the reduction of muscle tension.
9.3.1 Control with 1 electrode
Proportional. The opening speed is determined by the speed and strength of
Opening:
the muscle contraction.
Proportional. The closing speed is determined by the speed and strength of
Closing:
the muscle relaxation.
By very slow muscle relaxation to the electrode; the MyoHand VariPlus Speed
Stopping:
stops in an opened position.
Example 1: After opening the amputee slowly relaxes the muscle. Closing takes place pro-
portional to the decline of the electrode signal. The object is grasped with low
force.
Example 2: After opening the amputee relaxes the muscle at maximum speed. The MyoHand
VariPlus Speed closes at maximum speed and begins to grasp an object with
maximum grip force (approx. 100 N).
Control
mode 3
VarioControl Increasing electrode
signal through mus-
cle contraction
Speed and strength
of muscle contraction
to the electrode
Speed: proportional
Adjustment regula-
tor A
Display of the MyoSelect (757T13)
28 | Ottobock
VarioControl
Control with 1 electrode or
1 linear transducer
OPEN
Declining electrode signal
through muscle relaxation
Grip force: Proportional to the
decline of the electrode signal
After gripping once with maxi-
mum force, the EMG signal
required to OPEN the Hand
will be set to a higher value.
Opening the MyoHand VariPlus
Speed with unwanted electrode
signals is prevented.
Speed: proportional
Adjustment regulator A
Adjustment regulator A is used to adjust the proportional speed
of the "OPENING / CLOSING" function and the speed of grip
force build-up.
Notice: Always check the adjustments on the prosthesis and
adapt them to the amputee.
CLOSE
8E38=9, 8E39=9, 8E41=9
Indication
For amputees
with one strong
electrode signal or
tendancy to
co-contraction