Note:
A low battery can significantly degrade Doppler performance. When
the battery falls below optimum performance levels, the yellow LED on the
front of the unit becomes lit and the speaker volume will automatically drop
to an unusable level. This prompts the user to change the battery, returning
the Doppler to peak performance.
Operation (Speaker Unit)
On/Off Button
: The On/Off button is located on the left-hand side of the
speaker unit. The green LED on the face of the unit is lit when the unit is
turned on.
Volume:
The volume control is located on the left-hand side of the unit
below the on/off switch. Rotate the thumb wheel to achieve the volume that
is best for the application.
Outputs:
The 3.5 mm audio output jack on the top of the unit allows con-
nection of a stethoscope or recording device. The speaker will automatical-
ly mute when the stethoscope is plugged in.
Instructions for Use
1) Ordinarily the patient will lie on her back, abdomen exposed. The exam-
ination can also be easily performed with the patient on her side, sitting or
standing.
2) Spread a generous amount of ultrasound coupling agent (ultrasound gel)
on the body surface to be examined. A fluid coupling agent is essential for
proper operation. Lack of signal can be due to loss of fluid coupling.
Commercial preparations provide good coupling; however, a soap solution
or even water can be used. Do not use alcohol as a coupling agent.
Note:
Ultrasonic gel is not required for proper coupling during underwater use.
3) Ensure that the speaker unit and Doppler probe are securely connected
through the cord. Holding the Doppler probe, place the tip on the site to be
examined. Press the ON button. Adjust volume controls as desired.
- 8 -
- 7 -
4) Search for fetal heart signals by slowly moving the instrument across the
abdomen. The sensitivity pattern is like a searchlight, so angle the Doppler
for the best signal. In general, the fetal pulse can be detected as soon as the
uterus is palpable above the pubic symphysis.
Clinical Usage: Obstetrical Exams
The Tria Doppler System may be used to:
1) Detect fetal heart rate at 9 weeks. In rare instances, reliable signals may
not be obtainable until after the first trimester.
2) Make frequent checks of fetal heart rate throughout labor and delivery,
particularly during and immediately following contractions. Clinical person-
nel can carry the instrument with them as they would carry a stethoscope.
3) Confirm the presence of a live fetus throughout pregnancy, even when
maternal obesity or hydramnios prevents hearing the fetal heartbeat with a
conventional stethoscope. The Doppler can also be used to detect multiple
pregnancies.
4) Ease the fear and concern of the anxious expectant mother. Hearing the
fetal heartbeat may be particularly reassuring early in pregnancy.
5) Aid in localizing the placenta in patients with third trimester bleeding and
prior to amniocentesis or intrauterine transfusion. Placental sounds have a
“blowing” characteristic, along with a pulsatile component. Accurate local-
ization of the placenta requires some practice in search and recognition tech-
niques.
Summary of Contents for Medasonics TRIA P338
Page 12: ...1...
