Otto Bock 8E33-7 Instructions For Use Manual page 11

4.1 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 System.
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°.
4.2 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 45° in both directions.
When in position A, the Electric Greifer is switched off and the flexion joint is locked.
4.3 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 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.
4.4 Safety release (fig. 1, item 4)
In the event of a system malfunction, the safety release lever will disengage the Greifer.
Safety release lever positioned
towards control wheel:
Safety release lever positioned
away from the control wheel:
4.5 Manual grip force control wheel (fig. 1, item 5)
Clockwise rotation will close and counterclockwise rotation will open the fingers. In addition, the
Manual Wheel provides visual feedback during the gripping process (i.e. you can see the pause
in the time delayed automatic transmission).
5 Control modes
The prosthetist may choose from two different control modes by inserting or removing the 13E189
Function Plug. To reset the system so that it will recognize the new control mode, remove the bat-
tery, then re-insert it. To change the control mode, tilt the wrist flexion until the function plug can
be attached or removed using tweezers (fig. 4).
5.1 Coding plug inserted: Digital Mode (Dual Site) (fig. 2, as delivered)
After the corresponding electrode signal has exceeded a certain threshold value, the Greifer
opens and closes at a constant speed�
5.2 Coding plug removed: Double Channel Mode (Single Site) (fig. 3)
The Greifer is opened and closed by only one electrode.
A slow and gentle muscle signal
A quick and strong muscle signal
8E33=7 / 8E34=7
The Greifer will operate normally with elec-
tronic or manual control (fig. 1, item 5) of the
gripping fingers.
The drive train will be disengaged to allow the
fingers to move freely.
will close the Greifer�
will open the Greifer�
Ottobock | 11