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.
something designed to support a person in a sitting position, as a chair, bench, or pew; a place on or in which one sits. the part of a chair, sofa, or the like, on which one sits. the part of the body on which one sits; the buttocks. the part of the garment covering it: the seat of one's pants.