Class B autoclaves enable the sterilization of both wrapped and unwrapped instruments, no matter their type and complexity. The fractionated vacuum reduces the air in the sterilization chamber through repeated evacuation and steam injection. This process permits the sterilization not only of solid and porous instruments, but also of complex hollow body instruments with narrow lumen such as surgical hand pieces and endoscopes.
Class S autoclaves ensure the decontamination of single and double wrapped instruments, porous products and small parts. They can also sterilize simple hollow body instruments such as hinged instruments, for example scissors and clamps. Class S autoclaves are more cost-efficient, but are not suitable for sterilisation of complex hollow body instruments.