Autoclave sterilizer

Autoclave sterilizer: essential equipment in laboratories and hospitals for steam sterilization under pressure, eliminating microorganisms.

About this subject

An autoclave is a device that uses saturated steam under pressure to sterilize materials, reaching temperatures between 121°C and 134°C. The principle is based on denaturing microbial proteins and enzymes, including bacterial spores, ensuring sterilization. There are two main types: gravity displacement autoclaves, common in labs, and pre-vacuum autoclaves, which remove air before steam injection, increasing efficiency. In hospitals, autoclaves are used to sterilize surgical instruments, textiles, and infectious waste. Process validation is performed with biological indicators, such as Bacillus stearothermophilus spore strips. Regular maintenance, including cleaning the drain system and checking safety valves, is critical for safe operation. Modern autoclaves feature microprocessor controls that record cycles in real time, complying with regulations such as those from ANVISA in Brazil.

Frequently Asked Questions

How does an autoclave work?

An autoclave works by heating water to produce steam, which is pressurized inside the chamber. The saturated steam at high temperature (121°C to 134°C) penetrates materials, denaturing proteins and eliminating all microorganisms, including spores.

What items cannot be sterilized in an autoclave?

Materials sensitive to heat and moisture, such as some plastics, oily substances, powders, and optical instruments, may be damaged. For these cases, ethylene oxide or radiation sterilization is used.

What is the difference between gravity displacement and pre-vacuum autoclaves?

In a gravity displacement autoclave, steam pushes air out from the bottom. In a pre-vacuum autoclave, a pump removes air before steam entry, allowing better penetration into porous materials and faster cycles.