A.T.S. 3000 AUTOMATIC TOURNIQUET SYSTEM
26
NOTE:
At this point the reservoir pressure, if pressurized,
will be exhausted through the source ports and the lower
portion of the display should continue to display “CAL” “0”
as described earlier.
9. For zero, allow the port to exhaust to atmospheric
pressure so the unit can sense the zero point (i.e. when
setting the zero point nothing should be connected to any
cuff port). Press the Main Cuff PRESSURE button, the
unit will calibrate the reservoir zero pressure, the unit
will beep to let the user know the set point was taken.
10. Connect the calibration hose, calibrated pressure meter
and adjustable pressure source to the Main and Second
Cuff
source
ports. See Figure 3 for more details.
a. The Main Cuff (
red port
)
source
port on the unit is the
first port from the left side of the unit.
b. The Second Cuff (
blue port
)
source
port on the unit
is the third port over from the left side of the unit.
11. Press the Main Cuff INFLATE button to advance the
unit to the next reservoir pressure level. The display will
now be alternating between “CAL” and “250”. Apply
250 mmHg of pressure. Once the pressure has stabilized,
press the Main Cuff PRESSURE button so the unit can
calibrate the 250 mmHg point. The unit will beep to let
the user know the set point was taken.
12. Once the 250 mmHg point is calibrated, press the
Main Cuff INFLATE button to advance the unit to
the next reservoir pressure level. The display will
now be alternating between “CAL” and “475”. Apply
475 mmHg of pressure. Once the pressure has stabilized,
press the Main Cuff PRESSURE button so the unit can
calibrate the 475 mmHg point. The unit will beep to let
the user know the set point was taken.
13. Press the Main Cuff INFLATE button to advance the
unit to the next reservoir pressure level. The display will
now be alternating between “CAL” and “700”. Apply
700 mmHg of pressure. Once the pressure has stabilized,
press the Main Cuff PRESSURE button so the unit can
calibrate the 700 mmHg point. The unit will beep to let
the user know the set point was taken.
14. At this point, press the Main Cuff INFLATE and
Main Cuff DEFLATE buttons. The unit will display
“CALIBRATION” “COMPLETE”. The message
tells the user the calibration set points have been
calibrated to the unit and have now been saved into the
non-volatile memory.
NOTE: If the “CALIBRATION” “COMPLETE” message
is not displayed, the calibration is incomplete and the
adjustments will not be saved. Be certain to end the
calibration session by simultaneously pressing the Main
Cuff INLFATE and Main Cuff DEFLATE buttons and
verify the “CALIBRATION” “COMPLETE” message
is displayed.
If any pressure setting is off by more than 15 mmHg
or adjusted incorrectly, a “CAL” “FAIL” alarm will be
generated and service or calibration to the user’s pressure
meter or pressure source is recommended.
If the pressure signal from the internal transducer
requires more than a 15 mmHg correction to equal the
applied pressure, a “CAL” “FAIL” alarm will also be
generated. Service to the unit is recommended.
15. The unit remains in calibration mode until it is set
to STANDBY.
16. The stored calibration factors are retrieved from the non-
volatile memory during the power-up sequence. If the
checksum is invalid, a “CAL” “FAIL” alarm is generated
in the displays. The alarm will persist until the unit is set
to STANDBY. Re-calibration is required if this occurs.
17. It is recommended to check the calibration by following
the steps in Section 2.4 Step 5 “Calibration Check”
before using this unit on a patient.
3.6 LEAK TESTING
The
A.T.S.
3000 Tourniquet is capable of keeping a cuff with
a substantial leak inflated. Naturally it is desirable to keep
plumbing leaks to an absolute minimum. For this reason,
a check for significant leakage is recommended at regular
intervals as well as following any service procedure.
After verifying the operation of the
A.T.S.
3000 Tourniquet
per Section 2.4, connect a 24 in. (61 cm) (or larger) cuff
which is known to be leak free to the Main Cuff ports (
Red
)
of
A.T.S.
3000 Tourniquet System. Adjust the Main Cuff set
point to 475 mmHg. Ensure that all external connections
are tight. Inflate the Main Cuff and allow the pressure to
stabilize. At this point, the unit must be set to STANDBY.
Under normal use, the unit cannot be set to STANDBY
with a non-zero pressure value displayed in either cuff.
However for leak testing purposes, a bypass feature has
been incorporated. Press the ON/STANDBY button until the
alarm message “CUFF” “NOT” “DEFL” appears. Release
the ON/STANDBY button and within 5 seconds of the
alarm discontinuing, press and hold the ON/STANDBY
button again. The button must be held in for an additional
10 seconds before the unit will be set to STANDBY.
