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Intro To Anesthesia > Anesthesia machine overview > Flashcards

Flashcards in Anesthesia machine overview Deck (37):
1

PISS for Oxygen

2-5

2

gas/tank color yellow

air

3

Oxygen cylinder:

liters

pressure

625 L

2000 psi

4

Gas/tank color brown

Helium

5

O2 Flush valve

35-75 L/min

O2 delivery directly from source to patient circuit

**use with caution ONLY on exhalation b/c of risk of barotrauma

*only used for machine check and to help fill bellows on expiratory phase

6

flow meter

  • tapered
  • pressure of gas forces float up while gas still gets around float
  • read ball in middle
  • read long float at top
  • At low (laminar) flows- viscosity is important
  • At high (turbulent) flows- density is important 

7

Cylinder pressure regulator

down regulates pressure from tank to 45 psi

8

Intermediate pressure system

  1. pneumatic part of master switch
  2. pipeline inlets (50 psi, oxygen, nitrous, and air)
  3. pipeline check valves, pressure regulators and pressure gauges
  4. oxygen pressure-failure device
  5. oxygen flush valve
  6. oxygen second-stage regulator 
  7. flowmeter control valves

9

Gas/tank color blue

Nitrous oxide

 

10

the anesthesia machine

  • providdes delivery of medical gases and vapor of volatile anestheics in known concenrations to a common gas outlet
  • these gases enter a breathing system
  • delivered to the pt via spontaneous or mechanical ventilation
  • then exhaled gases are removed (scavenged) from the breathing system

11

Cylinder pressure gauge

gauge on cylinder.  

Full tank is 2,000-2,2000

12

Pressure sensor shut off

Proportioning type

As the O2 pressure drops, the N2O flow decreases proportionately

13

PISS for Nitrous oxide

3-5

14

pneumatic system

uses gas pressure to function

15

Low pressure system

  1. flow meter tubes
  2. hypoxia prevention safety device (proportioning device)
  3. vaporizers/vaporizer manifold
  4. check valves
  5. pressure relief devices (only on newer machines)
  6. common gas outlet

16

what are you checking on the complete (daily) check?

  • gas line connections
  • integrity of seal of system
  • flow meter controls
  • ventilator
  • vaporizer levels
  • oxygen analyzer
  • low pressure circuit leak test
  • circle system test (also between every case)
  • workstation self-test

17

Second stage Regulated

reduces Oxygen pressure to 14 psi and nitrous oxide pressure to 26 psi

(not in all machines)

18

Gas/tank color black

Nitrogen

19

Nitrous oxide:

liters

pressure

1590 L

750 psi

20

DISS

Diameter index safety system

  • provides non-interchangeable connections for the medical gas lines
  • consists of body, nipple, and nut
  • only properly mated parts will fit together and allow the threads to engage
  • required on every anesthesia machine. 

21

PISS for heliox

2-4

22

PISS for CO2

1-6

23

gas/tank color green

(international white)

Oxygen

24

High pressure system

  • cylinders
  • hanger yoke
  • yoke block with the check valves
  • cylinder pressure gauge
  • cylinder pressure regulator

25

Gas/tank color grey

CO2

26

Low pressure circuit test

  • purpose: check the intergrity of the macine from the flow control valves to the common gas outlet 
  • components in the low pressure circuit are the most vulnerable to breakage (you also will NOT hear a leak)
    • Negative pressure leak test:
      • preformed using a scution bulb to the common gas outlet
      • bulb is squeezed until fully collapsed, creating a vacuum in the low-pressure circuit
      • if bulb remains collapsed for atleast 10 seconds the machine is leak free

27

Oxygen pressure sensor shut off valve

or 

oxygen pressure-failure device

 

shuts of N20 or proportionally decreases the supply of N20 allowed into the machine if the O2 supply pressure decreases to a pre-determined threshold value 

25, 28, or 30, depending on model

**this safety mechanism doesnt actually know how much oxygen is in the mix, it only senses the pressure of the oxygen line.

28

Air cylinder:

liters

pressure

625 L

1800 psi

29

Anesthesia machine check

  • two checks:
  1. complete and through daily cehck (every 24 hours)
  2. circuit (circle system) check is preformed before each new surgical case

30

Circle system check

  • done between every case and with inital check
  • purpose: elavulates the integrity of the circle breathing system
  • the circle breathing system extends from the common gas outlet to the Y-Piece
  1. Leak Test - occulde the Y-piece, close the APT valve, flush the circuit with 30cm H20 pressure (O2 flush valve)
  • does not assess integrity of unidriectional valves
  1. Flow Test - attach breathing bag to Y-piece, turn on ventilator, and assess integrity of unidirectional valves

31

oxygen analyzer

  • the MOST imporant monitor on your machine for oxygen --> only thing that is making sure we're delivering the proper precentage of oxygen to the pt
  • the ONLY monitor tha detects problems downsream from the flow control valves
    • procedure: expose O2 sensor to room air (21%) then hook up to machine and ensure if reads above 90%

32

PISS for air

1-5

33

check valves

prevent backflow of gas

34

Five pathways of oxygen

  1. flow to the fresh gas flowmeters
  2. powers the Oxygen flush valve
  3. activates the fail-safe valve/mechanism
  4. activates the oxygen supply low-pressure alarm
  5. compresses the bellows of the ventilator

35

PISS

Pin Index Safety System

different hole/pin arrangement for each gas type so they cannot accidentally be set up in wrong place.

36

Pressure sensor shut off

Threshold type

When oxygen pressure becomes lower than threshold (25, 28, or 30), this shut off type completely stops the flow of N20

37

The anesthesia workstation

integrates most of the components necessary for adminisration of anesthaia into on unit:

gas supply devices

anesthesia machine

vaporizers

ventilator

breathing system

scavenging sytem

respiratory and hemodynamic monitors

suction