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  • Washer/sterilizing units designed for automatic or semiautomatic washing (i.e., eliminating dirt and/or stains), removal of organic debris (e.g., blood, fat, bone), and killing all microorganisms including spore-forming bacteria (unless they are present in very high numbers), providing a high level of disinfection that is nearly sterile for surgical instruments and other critical utensils. These units typically consist of one or two corrosion-resistant chambers containing baskets or trays for the soiled instruments; some can accommodate instrument trays and/or racks. Surgical instrument washers/sterilizing units perform a cycle of operations typically including water prewash, enzyme treatment, detergent wash, heated rinse, steam sterilization (usually using steam from 121 to 140 degrees Celsius [250 to 284 degrees Fahrenheit]), and drying; the process usually includes mechanical removal of contaminants by water jets or previous manual scrubbing. Washer/sterilization units are used in the central supply area of a healthcare facility; their function is frequently replaced by the combined use of a washer/decontamination unit and a dedicated sterilizing unit.
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