Otto Bock 8E38 8 Series Instructions For Use Manual page 33

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
of the "SUVA sensors".
INFORMATION: Note that when the "SUVA sensors" are deactivated, the gripping force is not
readjusted automatically and gripped objects may slip from the grasp. After the battery is inser­
ted, vibration signals inform you of the current mode.
One vibration signal: Sensors are deactivated
Two vibration signals: Sensors are activated
2.2 MyoHand VariPlus Speed
The MyoHand VariPlus Speed is a prosthetic hand with myoelectric control, featuring a particu­
larly high gripping speed combined with an innovative, sensitive control concept. Various propor­
tional and digital programs for control are available, e.g. with one or two electrodes, a linear con­
trol element or a switch. These permit individual adaptation to the needs of the respective patient.
The terminal device is based on the Ottobock DMC system (DMC = dynamic mode control). This
system uses two independent measurement and control systems to optimally adapt the gripping
speed and gripping force to the muscle signal. Proportional control with DMC allows the gripping
speed and gripping force to be regulated in proportion to the level of the muscle signal. When the
strength of the muscle signal changes, the gripping speed and gripping force immediately adjust
to the changed muscle signal.
2.2.1 Program description
Six different control variants can be configured by the O&P professional with this terminal device.
Overview of control variants
• Program 1: DMC plus (control with two electrodes)
• Program 2: AutoControl LowInput (control with two electrodes, with one electrode and one
switch, or with one switch only)
• Program 3: VarioControl (control with one electrode or with one linear control element)
• Program 4: VarioDual (control with two electrodes)
• Program 5: DigitalControl (control with two electrodes, with one electrode and one switch, or
only with one switch)
• Program 6: Double Channel Control (control with one electrode)
2.2.1.1 Program 1: DMC plus
Control with two electrodes
The level of the gripping speed or gripping force is determined by the strength of the electrode
signal (resulting from the muscle contraction). The gripping force can be increased up to the max­
imum gripping force (approx. 100 N) at any time as needed via a stronger electrode signal.
Opening: Proportional via the OPEN electrode.
Closing: Proportional via the CLOSE electrode.
Example 1: With a low electrode signal, the lowest gripping force is built up to grasp an
object.
Example 2: A higher gripping force is generated with a higher electrode signal. Re-gripping
with a stronger electrode signal increases the gripping force up to the maximum of
approx. 100 N.
Open
Sustained electrode signal
Close
Sustained electrode signal
A maximum gripping force prevents the hand
from opening due to unintentional muscle sig­
nals.
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