Hygiene, Sterilisation and Safe Use of Tools and Equipment
The cleaning chain
Effective reprocessing follows a sequence: pre-clean to remove visible soil, clean (often with ultrasonic or manual washing), dry, then disinfect or sterilise according to the item's use. Soil left on an instrument can protect microorganisms and defeat disinfection. Understand the difference between single-use, reusable and semi-critical items, and match the process to the risk level. Semi-critical items contacting intact mucous membranes or broken skin need at minimum high-level disinfection; critical items penetrating skin need sterilisation.
Sterilisation methods
Common methods include steam under pressure (autoclave), dry heat and chemical sterilants. Autoclaves require correct loading, cycle validation, monitoring with indicators, and regular servicing. Know that pouches must not be overcrowded and that instruments should be clean and dry before loading. Chemical disinfectants require correct dilution, contact time and ventilation - more is not better and under-dilution fails.
Safe use of equipment
Electrical equipment must be tested and tagged, checked for damage before use, and used away from water. Know how to store tools, how to handle sharps, and what to do if a tool breaks or a disinfectant splashes the skin or eyes. Report faults rather than using damaged equipment.
Traps to watch
Questions often test whether disinfection sterilises (it does not), whether an autoclave cycle indicator proves sterility (it is one part of validation), and whether a quick wipe is sufficient for a contaminated tool (it is not).
Rule of thumb
Match the process to the risk: the more invasive the contact, the higher the level of reprocessing required - and always follow manufacturer instructions for dilution and contact time.