Week 7 Medical Gas Systems Flashcards
Using the link proportioning system, how is a hypoxic gas mixture defined?
- oxygen concentration of < 25%
- ratio of nitrous:oxygen of > 3:1 or 75% : 25% because anything more would dilute the oxygen to less than 25%
![](https://s3.amazonaws.com/brainscape-prod/system/cm/316/464/740/a_image_thumb.jpeg?1595174014)
What is the PISS?
-
Pin Index Safety System
- used for gas cylinders
- uses series of pinks to connected associated gas cylinder’s valves with its matching yoke clamp
- position of holes on the cydlinder correspond with pins on the yoke attached to the equiment
- prevents connection of the the wrong cylinder to a yoke
- misconnection unlikely, but not impossible
- where this is a will there is a way, so be diligent in checking and not forcing
- **Required for every anesthesia machine**
- **use only ONE washer when connecting**
A full tank of nitrous weighs _____ lbs, contains ______ L, and reads a pressure of about _____ psi.
20.7; 1590; 750
Name one reason that it is important to leave the E-cylinders on the anesthesia machine completely closed/off.
If the E-cylinder remains open, and pipeline pressure falls, your E-cylinder will drain without your knowledge, and when it runs out you will have no back up oxygen ready to go.
When are the two times that you will open your E-cylinders on the anesthesia machine.
- morning machine check
- for back up or emergency use
***otherwise they should remain closed***
The Department of Transportation establishes the requirements for __________, __________, __________, __________, __________, _________, ___________, __________, and ____________ of medical gas cylinders and containers.
- manufacturing
- filling
- qualification
- transportation
- storage
- handling
- maintenance
- re-qualification
- disposition
Purity of medical gases is specified in the ______________ and enforced by the ______.
US Pharmacopoeia; FDA
In a tank of oxygen, as the volume in the tank decreases, the pressure in the tank ________.
decreases
Name 4 possible errors that could cause the link proportioning system to fail.
- pipeline crossover or incorrect gas in cylinder
- mechanical issue
- defective pueumatic part, defective chain
- leaks distal to the flow meter
- If you add a 3rd gas
- you risk diluting hte partial press or concentration of gases in the mix you are administering
- i.e. if you have 75% nitrous and 25% oxygen and you had helium, you will dilute out your oxygen to less than 25% and deliver a hypoxic mixture to your patient.
The __________________ establishes the requirments for manufacturing, filling, qualification, transportation, storage, handling, maintenance, re-qualification, and disposition of medical gas cylinders and containers.
Department of Transportation (DOT)
State the standard color associated with oxygen, air, nitrous, helium, and nitrogen.
- oxygen - green
- air - yellow
- nitrous - blue
- helium - bronw
- nitrogen - black
**never judge a tank by its color**
This label shows the Compressed Gas Association (CGA) marking system.
- The diamond shape denotes the __________.
- To the left is the name of the ___________.
- To the right is the __________, with statements of hazars and measure to be taken to avoid injury.
![](https://s3.amazonaws.com/brainscape-prod/system/cm/316/466/988/q_image_thumb.jpeg?1595177134)
- hazard class (non flammable)
- contained gas (carbon dioxide)
- signal word (caution)
What is the link proportioning system on the anestha machine?
- fail safe mechanism
- 3:1 protection
- 3 parts nitrous : 1 part oxygen
- never going to have more than 75% nitrous going to patient
- If you begin to dial up the nitrous, the oxygen will automatically dial up to 25%
- oxygen flowmeter works independly of nitrous dial, but nitrous dial is always proportioned with oxygen dial
Name the pin locations, for oxygen, nitrous oxide, air, carbon dioxide, and entonx.
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Distinguish between all eight specified markings on the cyclinder.
![](https://s3.amazonaws.com/brainscape-prod/system/cm/316/466/478/q_image_thumb.jpeg?1595176150)
- cylinder specification - regulatory type (DOT), cylinder type of material, service/working pressure in psi
- serial number
- date of manufacturer - MM/YY
- neck ring identification - original owner of cylinder
- retest markings - Month/Facility/Year + symbol - cylinder qualified for 10% overfill. star - meets qualifications for a 10 year retest, instead of the usual 5.
- barcode label - provides a unique cylinder identifier and is used by computer systems to track cylinders throughout the fill process
- cylinder manufacturer’s inspection marking
- cylinder tare weight - may be preceded by “TW”