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FLOW SETTING:
The FLOW SETTING control buttons vary the speed of
the vacuum pump depending on the flow range in use.
OPEN Mode flow is adjustable to at least 90 lpm and LAP
Mode flow from 4 + 1 to at least 18 lpm.
The FLOW SETTING is used only as a general indicator
of what the flow will be when the pump is started. The
purpose of the display is to allow the operator to preset the
desired flow when the pump is not running. The FLOW
READING is meant to provide a more accurate measure of
the flow actually occurring. There may be relatively large
differences between the FLOW SETTING and the FLOW
READING.
The FLOW READING display provides a good measure
of the actual flow when the pump is running. The FLOW
READING displays 00.0 (Zero) when the pump is not
running. Measuring flow is a very complicated process.
The actual flow through the pump will vary significantly
depending on the accessories, and the measuring devices
used.
Be sure to follow the procedures listed in the
Calibration section explicitly when trying to calibrate, or
measure, the flow through the evacuator.
OPEN MODE:
The OPEN MODE is used with the PenEvac1
Shroud™, or other types of surgical smoke collection 10mm
or greater tubing sets. These procedures are considered
"open" in that the flow of air and vapor to the surgical site
is not restricted like it is during a laparoscopic or other
"closed" procedure. During the open procedures, higher
flow rates are very desirable to remove effectively all smoke
from the site and to keep it from permeating the operating
room. When the OPEN button is pushed, the high flow
solenoid is activated to select the high flow air circuit.
The flow circuit is monitored by a vacuum sensor in order
to detect an occluded air stream. If an occlusion is detected,
the pump immediately stops to prevent tissue damage.
Within a few seconds, the pump will attempt to restart. If
the occlusion has been cleared, the pump will run. If the
occlusion is still present the pump will not start and will
again attempt a restart in a few seconds. The restart attempts
will continue until the occlusion is cleared, or until TIME
SETTING expires.
The flow resistance is also monitored for changes in
restrictions in the air stream that do not represent an
occlusion.
When the set point is exceeded, sensing that the
®
SAFEGUARD BLUE
Built-in Fluid Trap is no longer effectively capturing
particles, the CHANGE FILTER light is illuminated. The
pump is not stopped unless the restrictions are allowed to
continue (filter gets fuller) and an occlusion is sensed.
®
, ESU Pencil
Hydrophobic ULPA Filter with
LAP MODE:
LAP flow range is used during laparoscopic ("closed")
procedures, they are characterized by a limited amount of
gas (air, carbon dioxide, etc.) being available for evacuation.
LAP MODE is used as many insufflators can only provide
4 - 6 lpm to the cavity. If the FLOW SETTING is set to
evacuate much higher rates, the pneumoperitoneum will
collapse.
Therefore, the operator needs to balance the
FLOW and TIME SETTINGS to optimize the amount of
gas removed at any one time.
The LAP MODE is also monitored for Occlusion and
Change Filter conditions. These are monitored by the same
vacuum sensor and uses parallel circuits to those in the
OPEN MODE. For more information, refer to the OPEN
MODE description.
The LAP MODE is also monitored for two other
conditions. The CRYSTAL VISION
monitors the pressure in the flow circuit when the pump is
NOT running. The NO PATIENT circuit looks for the
presence of a positive pressure to indicate that the evacuator
is attached to the pneumoperitoneum correctly and that there
are no occlusions (typically closed stopcocks) in the circuit.
If the circuit is not attached to the patient, or a stopcock is
closed, or the filter is completely clogged, the positive
pressure in the pneumoperitoneum cannot be sensed by the
®
CRYSTAL VISION
. Under these circumstances, the NO
PATIENT lamp comes on. Whenever this light comes on,
it is important to correct the problem because the evacuator
will not be able to monitor the pressure in the
pneumoperitoneum for OVER PRESSURE conditions nor
will it be able to evacuate smoke when it is generated.
The pneumoperitoneal pressure is monitored (if the circuit
is connected properly and the NO PATIENT light is out)
when the pump is not running. If the pressure sensed is
approximately 27 mmHg, the OVER PRESSURE light
alert is activated until the pressure drops to below 27 mmHg.
If the pressure exceeds approximately 30 mmHg, then the
pump will start and run for the set time.
22
®
, in LAP flow only,
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