Hemodialysis uses a special filter called a dialyzer that functions as an artificial kidney to clean your blood. The dialyzer is a canister connected to the hemodialysis machine.
seat noun (FURNITURE) A2 [ C ] a piece of furniture or part of a train, plane, etc. that has been designed for someone to sit on: Chairs, sofas and benches are different types of seat. Please have/take a seat (= sit down). A car usually has a driver's seat, a front/passenger seat and back/rear seats.
Toilet seat. A toilet seat is a hinged unit consisting of a round or oval open seat, and usually a lid, which is bolted onto the bowl of a toilet used in a sitting position (as opposed to a squat toilet). The seat can be either for a flush toilet or a dry toilet. A toilet seat consists of the seat itself, which may be contoured for the user to sit on, and the lid, which covers the toilet when it is not in use â the lid may be absent in some cases, particularly in public restrooms. When the lid is down, it can be used as a seat.