Fillauer Myolab II, Prosthetist Manual

Page: 5 / 16

5
Figure 2
Preparing the Preamplifiers
The stainless steel electrodes are screwed directly into the
preamplifiers. This direct mounting technique eliminates artifact
problems caused by movement of electrode lead wires and electrical
interference. However, these electrodes can be removed from the
preamplifiers and reconnected to them with lead wires having screw
type (4-40 UNC) connectors thereby allowing for remote placement if
so desired.
Ensure that the electrodes or any connector wires used are screwed
snugly (finger tight only) into the preamplifier. Do not over-tighten.
Using the Myolab II to Monitor EMG Activity
1. To avoid static damage to the preamplifiers, always ensure that
the patient is at the same electrical potential as the Myolab. Two
good ways of doing this are:
a) After properly picking up the preamp (ground first), touch the
patient with your free hand before placing the preamp on the
site being examined.
b) Have the patient touch the ground (center) electrode before
the active (outside) electrode comes in contact with the patient.
2. After guarding the patient, place the preamplifier with its
electrodes on the skin directly over the muscle group to be
monitored (Figure 3). Be certain that the three electrodes on
each preamplifier are all in good contact with the skin. The
use of a strip of hypoallergenic medical grade tape to hold the
preamplifier in place is recommended.