
Attention:
Driving Vehicles
An upper limb amputee’s ability to drive a vehicle is determined on a case-by-case basis. Fac-
tors include the type of fitting (amputation level, unilateral or bilateral, residual limb conditions,
design of the prosthesis) and the amputee’s abilities. For maximum safety and convenience,
Otto Bock recommends that a specialist evaluate the need to adapt the vehicle with specialized
equipment. For maximum safety, Otto Bock recommends always operating vehicles with the
System Electric Greifer switched OFF. Driving with the System Electric Greifer switched ON
may present a risk if the Greifer inadvertently opens due to unintentional muscle contraction or
other causes.
Caution!
The 8E33=7 Electric Greifer is equipped with a quick-disconnect adapter. Before using it to
drive a vehicle, it must be positioned in such a way that slight rotation of the Greifer- which might
occur when steering a car - will not disconnect the Greifer from the prosthesis.
3 Description and Function
8E33=7: Electric Greifer with System Hand Quick-Disconnect. Electrical connection
to the forearm via coaxial bushing.
8E34=7: Electric Greifer with Friction Joint and Lamination Ring. Electrical connection
to the forearm via cable (not illustrated).
Both types of Electric Greifers offer Digital Twin Control.
The Digital Twin Control system provides both a digital control mode (dual site) and a double
channel control mode (single site) in the same terminal device. The desired control mode can
be selected by inserting or removing the 13E189 Function Plug. The digital mode (dual site) is
controlled by two electrodes and the double channel mode (single site) is controlled by only one
electrode – either 13E68 or 13E125.
The Greifer's coaxial bushing or the cable which exits out of the Greifer are marked with a white
ring for identification purposes.
The System Electric Greifer is delivered in digital mode (dual site) with the function plug in-
serted.
3.1 Quick-Disconnect Adapter (only with 8E33=7) (fig. 1, item 1)
The 8E33=7 Electric Greifer includes a quick-disconnect adapter that fits the MYOBOCK Sys-
tem. To remove the Electric Greifer from the prosthetic socket and replace it by a System Electric
Hand with a quick-disconnect adapter, rotate the hand approximately 360°.
3.2 On/Off Switch, Flexion Joint (fig. 1, item 2)
The electric on/off switch simultaneously activates the wrist flexion joint.
When in position B, the Electric Greifer is ready for operation and the flexion brake is released.
This makes it possible for the Greifer to be passively moved approximately 45o in both direc-
tions.
When in position A, the Electric Greifer is switched off and the flexion joint is locked.
3.3 Fingertips (fig. 1, item 3)
To improve the angle of approach, the fingertips can be rotated by ±60°, or they can be replaced
with other fingertips having other functions (see “Myobock Arm Components” Catalog for op-
tions).
To adjust the fingertips, open the Greifer as far as possible. Loosen the center screw until the