Trigno
TM
Personal Monitor User’s Guide
33
Using the Wireless EMG Sensors
Orienting the Sensors on the Skin
Trigno EMG Sensors are fitted with 4 silver bar contacts for detecting
the EMG signal at the skin surface. It is crucial that the orientation of
these bars be perpendicular to the muscle fibers for maximum signal
detection. The top of the sensor is shaped with an arrow to aid in the
determination of this orientation. The arrow should be placed parallel
to the muscle fibers underneath the sensor. The sensor should also be
placed in the center of the muscle belly away from tendons and the
edge of the muscle. The sensor is easily attached to the skin using the
Delsys Adhesive Sensor Interface
muscle fiber direction
Figure 33:
EMG Sensors must be properly oriented with the muscle
fibers. Align the sensor’s arrow with the direction of the underlying
muscle fibers.
Cleaning the Sensors Site
Prior to affixing the EMG sensor on the surface of the skin, the sensor
site must be properly cleaned to remove dry dermis and any skin oils.
Wiping the skin prior to sensor application is critical. If excessive hair
is present, it may be necessary to shave the site. In cases where the skin
is excessively dry, it may be useful to dislodge dry skin cells by dab-
bing the site with medical tape. The dry cells will attach to the tape’s
adhesive when it is removed. Be sure to wipe with isopropyl alcohol
to remove any adhesive residue that may remain.
Applying the Sensor Interface
Trigno System are supplied with specially-designed adhesive inter-
faces to simplify sensor attachment. These interfaces are cut from
double-sided medical grade adhesive approved for dermatological ap-
plications. Usage of the interface promotes a high quality electrical
