anesthesia machine

Question 1

high pressure system

Answer 1

Cylinder/tanks

hanger yoke and check valves

Question 2

intermediate pressure system

Answer 2

pipeline sources
cylinder pressure regulators
O2 flush valve
flowmeter control Knobs
O2 pressure failure device (O2 pressure sensor shutoff valve, fail-safe)
second stage regulator (not in all machines)
pneumatic part of master switch?

Question 3

Low pressure system

Answer 3

• flowmeter tubes
• Proportioning Link System
• one way valve: outlet check valve
• pressure relief devices
• common gas outlet
• vaporizers
• **pressure is slightly above atm pressure

Question 4

O2 pressure sensor shut-off valve

Answer 4

safety valve located downstream form N2O supply
shuts off turns down N2O when a direct eased O2 Pressure is detected
*Only detects pressure
*2 types: threshold and proportioning
Threshold: when the psi of O2 isn’t enough to push up the diaphragm, it comes down pulling the piston and valve with it (1, 27)

Question 5

Pipeline pressure

cylinder pressure

Answer 5

50 for all
O2: 2200psi, N2O: 745psi
*cylinder are down regulated to 45psi, this is on purpose so if the cylinder is not closed then machine will automatically take from the pipeline bc of the higher pressure

Question 6

for O2 cylinders volume

Answer 6

decreased pressure is directly proportionate to volume

Question 7

how many minutes left in tank?

Answer 7

xL in tank/ LperMin

Question 8

Pressure regulators

Answer 8

reduce cylinder pressure 2200psi–45psi

Question 9

flowmeters

Answer 9

measure gas flow to common gas outlet
O2 Knob different texture, sticks out, larger diameter
**O2 flowmeter positioned downstream from Nitrous….prevent hypoxic mixture if leak, but not fail proof.

Question 10

color/PISS safety

Answer 10

N20 blue 3,5
Air yellow 1,5
O2 green 2,5

Question 11

O2 flush

Answer 11

flow 35-75L/min

goes to machine outlet and pt circuit

Question 12

Proportioning link system

Answer 12

N2O and O2 are hooked together, can’t make an hypoxic mix, prevent FiO2 from being less that 25%, if try to turn O2 off with N2O on…will turn down N2O
*must keep FiO2 at 28%

Question 13

Anesthesia Machine Check…checking

Answer 13

1. gas line connection
2. Vent check
3. flow meter controls
4. Vaporizer level
5. O2 analyzers
6. Low pressure circuit leak test
7. Circle system test
8. Workstation self test

Question 14

Low Pressure Circuit test

Answer 14

checks integrity of machine from flow control valve to common gas outlet
*components here most vulnerable to breakage

Question 15

1993 FDA Neg-Pressure Leak test

Answer 15

preformed using suction bulb to common gas outlet, squeeze bulb, stays compressed…leak free

Question 16

circle system check

Answer 16

integrity of circle breathing system…machine common gas outlet to y-piece
1 leaks
2 gas flows properly during inspiration and exhalation

Question 17

2 ways to eliminate CO2

Answer 17

Fresh gas flow or CO2 absorbent

Question 18

Anesthesia delivery system goals

Answer 18

1 deliver gas from machine to alveoli in same concentration in shorts possible time
2 effectively eliminate CO2
3. have minimal equipment dead space
4. low resistance

Question 19

What causes low resistance

Answer 19

short lubing, lg diameter, no sharp bends, minimize connections

Question 20

What causes high resistance

Answer 20

sharp bends, 1 way valves

Question 21

Dead space

Answer 21

in the Y piece, increases chance of rebreathing CO2

Question 22

O2 analyzer

Answer 22

only monitor that detects problems Downstream from flow control valve.

Question 23

O2 supply failure alarm system

Answer 23

Fail-safe, if O2 pressure drops below 30psi, an alarm goes off.