The VAVD regulator incorporates a 2-way selector valve for selecting no suction or a preset level of suction.
REG Mode: With the vacuum regulator attached to the vacuum system and a vacuum capable venous reservoir
attached to the vacuum regulator, rotating the control valve on the side of the vacuum regulator will place the
vacuum regulator in the REG mode. Vacuum can now be regulated from 15-60 mmHg or shut off by turning the
knob all the way clockwise.
With the control valve in the REG position, wall vacuum may be controlled to a specific level by turning the large
adjusting knob in the direction indicated. A spring opposed diaphragm assembly precisely controls the level of
suction provided at the lower inlet port of the regulator. This assembly senses changes in the venous return
circuit and makes appropriate adjustments to maintain the vacuum level that has been selected. Vacuum level is
adjusted by turning the large knob in the direction indicated. Regulated settings are verified with the large, easy
to read gauge.
OFF Mode: When the vacuum regulator is on the OFF position, the vacuum return circuit reverts to atmospheric
pressure.
The model 3930 regulator is supplied with a high flow bubble barb for attachment to wall suction. Only braid
reinforced tubing suitable for suction service should be used when connecting this to a central suction supply.
Inappropriate tubing could lead to a reduction in flow and compromise patient safety. The tubing should exit the
fitting in a downward vertical orientation to minimize the possibility of kinking the supply tubing over time.
Connect the externally reinforced clear tubing to the WAGD connection (below). This line is meant to conduct
waste gases without applying negative pressure to the blood or gas inlet of the oxygenator.
The patient connection must be connected to an appropriate cardiotomy reservoir, do not draw patient materials
directly into this line, the use of a disposable vapor trap between the suction regulator and the cardiotomy
reservoir is recommended.
3930.003 Rev C P/N 34031 6 of 9
Released July 2014 User Manual VAVD Controller
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