Suction canisters are medical containers used to collect and store fluids removed from a patient during medical procedures, such as surgeries or airway clearing. They connect to suction machines and serve as a reservoir for bodily fluids like mucus, blood, and other secretions, ensuring a hygienic process. These canisters are essential in maintaining a sterile environment and preventing cross-contamination. They come in various sizes and materials, with measurement markings for accurate fluid monitoring, enhancing both patient care and safety during procedures.