A.T.S. 3000 AUTOMATIC TOURNIQUET SYSTEM
16
situation, it is likely that the valves will be disabled causing
the system to hold cuff pressure. It is also likely that a tone
will sound under these conditions. Most audible alarm tones
may be silenced for 30 seconds by pressing the ALARM
SILENCE button. The tone will be re-enabled at the end of
the silenced period. Pressing the ALARM SILENCE button
will cause the alarm tone to be silenced again.
The
A.T.S
. 3000 Tourniquet will also provide Error Code
information for critical alarms as shown in Table 2.3.
To minimize nuisance alarms (i.e. “HI-P”, “LO-P”) that can
be caused by vigorous movement of the patient’s limbs, a
1.5-second delay has been designed into the alarm actuation.
Under certain conditions, such as when a FAIL indication
appears in the TIME display or the information that appears
in the TIME and PRESSURE displays is unintelligible,
the operator should conclude that a hardware failure has
occurred, rendering the unit unusable. The appropriate
action is to set the unit to STANDBY by pressing the ON/
STANDBY button.
Since this removes power from the
internal instrument circuitry, all instrument functions,
commands to the valves and pump will cease. This
will cause the cuff to hold pressure (in the absence of
leaks)
. Clamp the cuff lines with hemostats and replace the
tourniquet unit.
2.12.1 PRESSURE ALARMS
A pressure alarm will occur when the pressure in a cuff is
more than 15 mmHg from the pressure set point. It is also
possible for a cuff to have a leak that is substantial but which
the unit can compensate for by continual pumping. This type
of leak could be due to a pin hole in a cuff bladder, or a loose
pneumatic fitting. This type of leak could progress into a
total failure of a cuff to hold pressure. To alert the operator
that a substantial leak is present, a pressure alarm is declared
when this type of leak is continuously present for more than
9 seconds. If a pressure alarm occurs, and the displayed
pressure is not more than 15 mmHg from the set point, then
this type of substantial leak has been detected and all cuffs
and pneumatic fittings should be checked for leaks.
Table 2.1 Alarm Condition
CONDITION
PRESSURE
DISPLAY
TIME
DISPLAY
APPROPRIATE ACTION/REMARKS
CUFF PRESSURE LOW
The pressure in the cuff is
15 mmHg below set point
LO-P
normal
This condition is generally caused by a leak in
the system, or a hose occlusion. All lines and
connections should be checked.
CUFF PRESSURE HIGH
The pressure in the cuff is
15 mmHg above set point
HI-P
normal
Normally caused by transient conditions such as
patient movement, controller overshoot, or hose
occlusion. This condition, for an extended period,
would indicate a hardware failure and the
A.T.S.
3000 unit should be replaced.
CUFF SIDE LEAK
A leak has been present for at least
9 seconds.
CUFF LEAK
normal
A substantial leak has been present for more
the 9 seconds. All lines and connections should be
checked.
RESERVOIR LEAK
A leak is present between the pump
and valves
RES LEAK
normal
Do not use the unit. Service the unit.
INFLATION TIME IN EXCESS
OF SETTING
The cuff has been inflated beyond
the set time limit
normal
TIME UP
Surgeon should be warned of time up condition.
Only on the direction of the surgeon, time should
be set to new value.
CUFF INFLATION ON
POWER UP
Cuff pressurized to 50 mmHg or
greater at power up
CUFF
INFL
The system assumes that a procedure is in progress
and adopts the sensed pressure as the new set point.
The operator should immediately check the set
value to determine if it needs reset.
CUFF NOT DEFLATED
Pressure in deflated cuff is a non-
zero value
normal
CUFF NOT
DEFL
Check for kinks in hose. If alarm persists,
disconnect hose from cuff. If attempting to
set the unit to STANDBY, ensure that cuff is
fully
deflated.
