This dressing trolley was used to hold instruments and dressings on wards or in surgical theatres. The plastic bowl is called a swab bowl. Having casters on the dressing trolley makes it easy for the hospital staff to move instruments to where they are needed before returning them to the steriliser.
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Glossary: dressing trolley
An instrument used to make objects sterile by killing or eliminating agents such as fungi, bacteria and viruses.