Ultrasound Technologies Fetatrack 310, Service Manual

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Ultrasound Technologies Ltd
Operating Procedures
Fetatrack310 Service Manual Issue3 Page 10
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Transducer position which results in sounds with a strong placental or cord signal
should be avoided, as these frequently render traces with artifacts.
It is important that a distinct fetal heart sound is present during monitoring for correct
function of the unit . Any doubt about fetal variability should be checked by listening to
the audible signal, or by an alternative diagnostic technique.
A simple check of the ultrasonic system can be made by holding the transducer against
the palm of the hand and stroking the back of the hand at a fixed rate, for example,
twice per second. A clear audible signal should be heard and the digital display
should show a rate after approximately five seconds. With the printer running this rate
will be recorded on the chart.
In the event of HR1 and HR2 traces overlapping or having similar rates the HR2 (US2)
trace can be offset by –20bpm by pressing and holding the US½ key. This is reset when
the recording session finishes.
Uterine Activity Monitoring
The Toco transducer is used to monitor uterine activity. The transducer plug is colour
coded grey for ease of identification. To monitor uterine activity plug the Toco
transducer into the grey UA input socket.
The Toco transducer is sealed to prevent the ingress of fluids. NO coupling gel is
required for this transducer to operate correctly.
Place the transducer on the centre line over the fundus in a position where the
uterus is firm, and secure in place with the stretch belting. Attach belt in the same
fashion as with the ultrasound transducer.
Once the transducer is in position, push the Toco Zero button on the front panel to
zero the recording. The position of the zero baseline can be set to suit individual
preferences. For details of how to change the pre-programmed baseline refer to ‘User
Configuration’.
Fetal Activity
Fetal activity may be recorded with the assistance of the patient. A hand-held
marker switch is provided for this purpose and this is plugged into the socket
immediately to the right of the UA input on the front of the unit.
If the patient feels movement of the fetus she may press the switch and this will mark
the paper with an arrow in the gap between the HR and UA traces. Alternatively this
marker may be used by the midwife to indicate any changes made during the
procedure, such as repositioning of the transducers or movement of the patient.
A front panel event marker is also provided, and this marks the trace on the top edge of
the HR scale. This can be used where two types of indication are required.