Chapter 15 (Notes) Flashcards
The basic EtO sterilization cycle consists of five stage:
- ) Preconditioning
- ) Humidification
- ) Gas
- ) Introduction
- ) Exposure,
- ) Evacuation
- ) Air washes
The basic EtO sterilization cycle takes approximately
2.5 hours
Minimum general recommendations for aeration time
8 hours
Minimum general recommendations for aeration temperature (8hrs)
140F (60C)
Hydrogen peroxide gas plasma using a hydrogen peroxide solution ranging from
59% to 95%
The phases of hydrogen peroxide gas plasma include:
- ) Vacuum - The load is heated while the vacuum system removes any remaining water as it evaporates. Air is removed from the chamber and packages until the pressure is reduced to below atmospheric pressure.
- ) Injection - Once the correct pressure has reached, a premeasured amount of concentrated hydrogen peroxide is pumped from a cassette into the vaporizer bowl and then vaporized into the chamber.
- ) Diffusion - The diffusion stage drives hydrogen peroxide vapor into a small cervices and lumens of devices. The chamber returns to atmospheric pressure to accomplish this.
- ) Plasma - A vacuum decreases the pressure, and radio frequency (RF) energy is radiated within the chamber from an electrode screen. The RF energy ionizes the hydrogen peroxide, creating hydrogen peroxide gas plasma. The injection and plasma phases are repeated a second time.
- ) Vent - At the end of the second plasma sequence, the RF is turned off. Air is then vented into the chamber through bacterial high-efficiency particular air (HEPA) filters, returning it to atmospheric pressure. The process byproducts are only water vapor and oxygen. Aeration is not required, and instruments can be used immediately following the 24- to 75-minute sterilization cycle
The hydrogen peroxide cassette is automatically ejected into a collection box for safe disposal after
5 cycles
Hydrogen peroxide gas plasma is not compatible with:
- ) Liquids and powders
- ) Any material that absorbs liquids.
- ) Items that contain cellulose, such as cotton, paper or cardboard, linens, huck towels,gauze sponges or any item containing wood pulp
AORN guidlines recommend that biological monitoring should be performed at least
Daily (Preferably with each load)
Vaporized hydrogen peroxide sterilization uses a
59% hydrogen peroxide solution
Vaporized hydrogen peroxide is injected ______ times during each sterilization cycle
4
Vaporized Hydrogen Peroxide Cycle Temperature:
Less than 122F (50C)
Ozone sterilization cycle time is
4.5 hrs
Ozone Sterilization cycle temperature:
87.4F to 97F (30.8 to 36C)
Ozone Sterilization Relative Humidity
85% to 100%
Who regulates Ozone as a toxic gas?
- ) OSHA
- ) FDA
- ) NIOSH
Ozone sterilization requires a well ventilated room with ________
10 air exchanges per hour
_____ is the byproduct of Ozone sterilization
Oxygen