VisualSonics VEVO Operator's Manual page 26

Chapter 3: Theory of Operation: Theory of operation
Operational flowchart
16 VisualSonics Vevo Compact Anesthesia System Operator Manual
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determines the amount of anesthetic agent vapor that will be added to the
oxygen flow. The amount is measured as a percentage of the total flow
and can be varied from 0-5%.
Lines from the vaporizer and the oxygen flush valve merge through
5.
the common outlet and into the delivery sub-system.
Gas enters the delivery sub-system where it is bifurcated by a Y-tube
6.
into two branches. A stopcock within each branch of the circuit provides
independent control of each branch.
a. When the stopcock to the induction chamber breathing circuit is
open, gases enter through the feed-tube. Turbulence circulates
the anesthetic gases throughout the chamber. Gases then flow
passively through flexhose evacuation tubing to a charcoal filter.
b. When the stopcock to the mouse mask breathing circuit is open,
gases flow to the mouse mask, where the subject inhales and
exhales. Gases then continue through flexhose evacuation tubing
to a charcoal filter.
Vaporizer Sub-system
0
2
Delivery
Sub-system
Stopcock #1
Charcoal Induction Chamber
Filter (Subject)
Oxygen Supply
(tank or house line)
0 @ 2200 PSI
2
Regulator
0 @ 55 PSI
2
Oxygen Flowmeter
(adj. 0 to 4 lpm)
0 @ 0 to 4 LPM
2
Vaporizer
+ Agent @ 0 to 4 LPM
40-50 LPM with
Flush Button
Common Outlet
Stopcock #2
Normal Flow with
Oxygen Flush closed:
0-4 lpm of Oxygen and
% Anesthetic Agent
Flow with Oxygen
Mouse Mask
Flush Activated:
Breathing Circuit
40-5- lpm
Subject
Oxygen Flush Valve
(normally CLOSED)
Activated
Charcoal
Filter
V1.0