Machine Overview Flashcards
Anesthesia work station consists of: 8
Gas supply devices, anesthesia machine, vaporizers, vent, breathing system, scavenging system, respiratory/hemodynamics monitors, suction
What is common gas outlet
Delivery of medical gases and vapors of volatile anesthetics in known concentrations
Removal of exhaled gases
Scavenging
Standards of anesthesia workstations overseen by 2
American society for testing and materials (ATSM)
And
American national standards institute ANSI
Standards specifies what
Required components of anesthesia work station
High pressure
2000 PSI
Intermediate pressure
50 psi
Pressure of gas in hospital
50 psi
Green, blue, pink usually stand for what
Green- 02
Blue- n20
Pink- agent
What does pressure regulator do
Lowers p of gas to 45 psi. Lower than p of hospital
Second stage regulator reduces pressure to what
20 psi
5 pathways of oxygen
Flow to fresh gas flowmeters Powers oxygen flush valve Activates fail safe valve Activates o2 supply/low pressure alarm Compresses bellows of vent
What is in high pressure system
Cylinders, hanger yoke,yoke block w check valves, cylinder pressure gauge, cylinder pressure regulator
Gas cylinder color Air, Oxygen Helium Co2 N2, NO
Yellow, green (intl white) Brown Grey Blue Black
Most anesthesia machines use what size cylinder
E
Oxygen tank: liters, pressure
625 L
2000 psi
NO volume and pressure in tank
1590 L
750 psi
Air gas volume and pressure
625 L
1800 psi
Pin index safety system numbering
1-6, counts from right to left
Placement of holes:
Oxygen
N2O
CO2
2-5
3-5
1-6
Placement of holes:
Air
Entonox
1-5
2-4
Pressure in oxygen tank falls ____ to amt of liters left in tank
Proportionally
Cylinder reassure regulators reduce pressure to ___, second stage to __-__ (___-__)
45
12-19 (20-30)
Intermediate pressure system: 7
Pneumatic part of master switch, pipeline inlets (DISS), pipeline check valves/pressure regulators, oxygen fail safe valve, oxygen second stage regulator, flow meter control valves
Wall supply what pressure
50-55 psi
Oxygen supply to machine what pressure (cylinder)
2000-2200 psi
Diss
Stands for what
What it connects
Required for what
Diameter index safety system
Medical gas lines- body, nipple, nut
Every anesthesia machine
What is oxygen pressure sensor shut off valve
A safety valve downstream of n20 supply source. Shuts off n2o or decreases it if o2 supply pressure decreases to pre determined threshold level (28)
When oxygen enters machine goes to what (2)
Pressure sensor shutoff valve and oxygen supply failure alarm system
Flow through oxygen flush valve, from what
Pipeline/common gas outlet to machine, 35-75 LPM
Potential harm from common gas outlet
Barotrauma and diluting anesthetic vapors
When to use o2 flush valve
Machine check
Expiratory phase of respiration to fill bellows
Low pressure system: 6
Pressure is slightly above what
Flow meter tubes, hypoxia preventing safety (proportioning) device, vaporizers, check valves, pressure relief devices, common gas outlet
Atmospheric pressure
At low flow in flowmeter: ___ flow, ___ is important, flow is __
At high flow in flowmneter: ___ flow, ___ is important
Tubular (diameter of channel less than length), viscosity, laminar
Turbulent, density
Types of flow meters
Thorpe tubes and electronic flow sensors
Safety features of flow meters: gas is __ __. O2 flow knob is what (3). How hypoxic mixture is prevented
Color coded
Flitted, projects beyond other knobs, larger in diameter
Oxygen flow meter downstream from nitrous
When fail safe flow meter might not be fail safe
Leak in flow meter
Anesthesia machine check: when and what
Complete daily check q 24h
Circuit check before each check
What you check in machine check: 9
Gas line connections, integrity of seal of system,
Flow meter controls, ventilator,
Vaporizer levels, oxygen analyzer,
Low pressure circuit leak test, circle system test,
Work station self test
Low pressure circuit test
Purpose
Components of this circuit are what
Checks integrity of machine from flow control valves to common gas outlet
Most vulnerable to breakage
Negative pressure leak test
Procedure requires what
Performed using suction bulb to what, how
The machine master switch, flow valves, and vaporizers to be off
Common gas outlet. Bulb squeezed several times until collapsed, created vacuum in low pressure circuit
Negative pressure leak test
What tells you there isn’t a leak
Bulb remains collapsed for at least 10 seconds
Purpose of circle system check
Extends from what to what
Evaluates integrity of circle system
Common gas outlet to y piece
Circle system check
How to do leak test
Doesnt assess what
Occlude y piece, close apl valve. Pressurize circuit to 30 cm h20 using 02 flush valve.
Integrity of unidirectional valves
Circle system check
Flow test
Attach breathing bag to y piece, turn on ventilator, assess integrity of unidirectional valves
What is the most important monitor on machine
Oxygen analyzer
Oxygen analyzer is only machine that detects what
Problems downstream from flow control valves
Oxygen analyzer procedure
Expose o2 sensor to room air (21%) for a given time
Best monitor you have
Vigilance