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VACUUM Air or other gases at a sub atmospheric pressure typically expressed as mmHg.
SUCTION A use of vacuum that causes a fluid or solid to be drawn into an interior space or to adhere to a
surface because of the difference between the external and internal pressures.
Alerts the user to the presence important operating and maintenance instructions in the
literature accompanying the device.
WARNING Alerts user to actions or conditions that could result in injury to user or patient.
CAUTION Alerts user to actions or conditions that can cause damage to the device or may result in
substandard performance of the device or system.
IMPORTANT Indicates an action that is emphasized to ensure proper operation of equipment.
OFF Supply suction is off and patient circuit is vented to atmospheric pressure.
REG Supply suction is on and regulated output is controlled to prescribed setting.
Lo Spike: Accuracy of regulation depends primarily on the ability to provide a consistent level
of vacuum under changing flow conditions.
Involuntary pneumatic biopsy, or tissue damage, can occur when high levels of vacuum are
applied to delicate tissue. With a Boehringer regulator, you can depend on very low “spike”
compared to our competitor’s models.
"Spike" is the variation in indicated suction as flow in the collection circuit changes from an a
free flowing condition to an occluded condition. We measure spike as the change in indicated
suction from full flow to a no flow condition using a typical collection circuit with a 14 French
catheter. To test, set the regulator to 50 mmHg flowing, and then allow occlude the 14Fr
catheter. The change in the indicated suction level is "Spike".
Boehringer regulators are checked on the assembly line to meet a specification of less than
10% of the indicated setting, for example 5mmHg spike at a 50 mmHg setting.
An evaluation of a regulator’s spike allows one to determine whether the device is truly
“regulating”. A safe and reliable regulator should regulate to its set position regardless of
variable flow conditions.
PARALLAX Inaccuracy caused by observational position of an indicating element (pointer) to a reference
element (scale).
This product is intended for use by or on the order of a physician. It is to be used by individuals who are properly
trained in the use of Vacuum Assisted Venous Drainage during Cardiopulmonary Bypass.
The Boehringer VAVD Controller was designed to provide accurate control of wall suction from 15 - 60 mmHg
for use in vacuum assisted venous drainage and the removal of waste anesthetic gases in cardiac surgery. The
VAVD provides a redundant safety device that vents excess negative pressure > 95 mmHg and positive
pressure > 10 cmH
2
O.
Definition of Terms and Symbology
3930.003 Rev C P/N 34031 3 of 9
Released July 2014 User Manual VAVD Controller
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