ASP sterrad NX, Service & Troubleshooting Manual

Page: 17 / 126

Functional Description
3
Chapter 3.
Functional Description
Overview of the Sterilization
Process
The STERRAD
®
NX
™
Sterilizer software interfaces with the hardware
through digital/analog input and output signals and through serial
communications via serial ports. The inputs monitor the sterilization
process while the outputs control the process. The process occurs as
follows:
1. The items to be sterilized are placed in the sterilization chamber, the
chamber door is closed, and a vacuum pump reduces the pressure in
the chamber.
2. A 59% aqueous solution of hydrogen peroxide is injected into the
delivery system condenser where it is condensed and concentrated
and then introduced into the chamber.
3. A low frequency electric current is delivered to the chamber
electrode, causing the formation of a low temperature gas plasma in
the chamber.
4. In the plasma state, the hydrogen peroxide vapor breaks apart into
reactive molecules that include free radicals.
5. The combined use of hydrogen peroxide and plasma safely and
rapidly sterilizes most medical instruments and materials without
leaving toxic residues.
STERRAD
®
NX
™
Service Guide 17