MIDTERM REVIEW Flashcards
Types of Vaporizers: Variable Bypass Vaporizers
•Ohmeda Tec 4 & 5, Drager 19.1, 19.3
Types of Vaporizers: Blender
•Ohmeda Tec 6 (Desflurane)
Factors that influence Tec 6 Vaporizer Output
Varried Altitudes
Carrier Gas composition
Effects of Varied altitudes of Tec 6
Requires manual adjustments of the concentration dial with changes in barometric pressured
Increase in Barometric pressure results in
Decrease Vapor administered
Never fill the vaporizer with
Dial on the “On” Position
Overfilling can occur
if key not tightly on the bottom
If Tipping occurs:
3 things to do
• In hardened facilities turn in to maintenance
• Flush for 20-30 minutes with high FGF and set the
vaporizer concentration low
• End-tidal agent monitoring
Pumping effect is Associated with______ or ________
•
• Bypass has diluted vapor and vaporizing chamber is also saturated with vapor
• Causes higher than expected vapor concentrations
positive pressure ventilation or oxygen flushing
During Pumping effect, Oxygen flush is at __ psig-
•
transmitted back
Occurs during the inspiratory phase - PPV
During Pumping effect there is ______Flow through _________
• Reverse flow through the vaporizing chamber back into the bypass chamber
Pumping effect more pronounced with
- Low flow rates • Low dial settings • Low levels of agent in the chamber • Rapid respiratory rates • High peak inspired pressures • Rapid drops in pressure during expiration
Dalton’s Law of partial pressure
In a mixture of gasses the pressure exerted by each gas is the same as that which it would exert if it alone occupied the container.
Henry’s law
At a gas/liquid interface, some of the gas will dissolve
in the liquid.
Measure Flow characteristics (COMMON)
Carrier gas (CG) bubbles through agent Manual Temp. conversion Multi-agent Operator determines CG split No longer manufactured (but still present on field machines)
The Ohmeda Tec 6 vaporizer pressurizes the liquid and warms it at
39C.
Variable Bypass characteristics
CG flows over agent Auto adjust for Temp &Pressure Agent specific Auto CG split Higher safety standards
TEC 6 has______alarm
- Agent______
- Tilt
- Power Failure
- Internal malfunction
Low Agent
Illuminates with______
Warm-Up
No Output Alarm
< 20 ml (1 bar)
> 10 degrees
50cc of agent1
0 minutes to reach operating
temp of 39C
Low pressure system
Manifold/Flowmeters
➢Thorpe Tube, Needle Valves, Floats
❖Ohmeda – Link 25 Proportion Limiting Control
System
❖Narkomed - Oxygen Ratio Monitor Controller
(ORMC)
❖Vaporizer Mounting Devices & Vaporizers
❖Common (fresh) Gas Outlet
❖Outlet Check Valve (only on Ohmeda)
❖Pressure Relief Device
HIGH PRESSURE SYSTEM
Size E Cylinders on back of machine ❖Cylinder pressure gauge (Bourdon) ❖Check valves in the hanger yoke ❖Index pins on the hanger yoke ❖Pressure regulator, i.e. First stage regulator
Intermediate pressure system
Pipeline inlet connections ❖DISS (diameter index safety system) ❖Pipeline check valves ❖Pressure gauges from pipeline ❖Machine piping (usually metal) ❖Gas power outlet for ventilator (outside the bellows) ❖Master Switch Oxygen Pressure Sensor “failsafe” Shut Off Valve (Ohmeda) ❖Oxygen Failure Protection Device “failsafe” (Narkomed) ❖Oxygen Supply Failure Alarm ❖Oxygen Flush valve ❖Second stage regulator ❖Before (Upstream) - Flow control valve (Sits on the fence)
Five main pathways or functions
- Powers the ventilator
- Oxygen flush valve
- Oxygen supply failure alarm
- Opens the pressure sensor shutoff valve
- Second stage pressure regulator
▪ Bypasses flowmeters etc & goes straight to
Common Gas Outlet
O2 flush valve
Flush valve flow rate _____LPM and presssure of _____
35-75 LPM at 50 psig
