8
Caution!
Before using a Quick-disconnect Electric Greifer Mechanism to drive a motor 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=6:
Electric Greifer with System Hand Quick-Disconnect. Electrical connection
to the forearm via coaxial bushing.
8E34=6: Electric Greifer with Friction Joint and Lamination Ring. Electrical connection
to the forearm via cable.
Both types of Electric Greifers offer DMC Plus Proportional Control.
The DMC Plus consists of two independent systems which precisely control the grip speed and
grip force of the Greifer. Grip speed and grip force are proportional to the strength of the EMG
muscle signal. The gripping process is much more natural, and it is easier to gently grip small or
fragile objects.
The DMC Plus circuit is
black
. The coaxial bushing or the cable, which exits out of the Greifer, is
marked with a
brown ring
for identification purposes.
The System Electric Greifers equipped with DMC Plus are controlled by two electrodes - 13E68
(round) or 13E200 (rectangle).
The prosthetist may choose from two different control modes by inserting or removing a Coding
Plug inside the System Electric Greifer. The DMC Plus Greifers will be delivered with the coding
plug inserted.
3.1 Quick-Disconnect Adapter
(fig. 1, item 1, only with 8E33=6)
The 8E33=6 Electric Greifer includes a quick-disconnect adapter that fits the Myobock® System.
To replace the Electric Greifer for 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 flexed approximately 45
o
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
o
, or they can be replaced
with other fingertips. (See “Myobock Arm Components” Catalog for options.)
To adjust the fingertips, open the Greifer as far as possible. Loosen the center screw until the
fingertips can be removed from the gear teeth. Replace or rotate the fingertip, then make sure
the gear teeth match exactly before tightening the center screw. The gripping surfaces will remain
parallel until they have reached a maximum opening of 95mm.
3.4 Manual Grip Force Control Wheel
(fig. 1, item 5)
Clockwise rotation will close and counter-clockwise rotation will open the fingers manually. In ad-
dition, the Manual Wheel provides visual feedback during the gripping process (i.e. you can see
Summary of Contents for 8E33-6
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