FIELD: medical engineering. SUBSTANCE: device has a pair of valve units, each communicating with container. Each valve unit has three openings communicating via communication chamber. Inlet opening is sealed with the first single stroke valve to allow liquid flow to pass through it into the chamber only. Outlet opening is sealed with the second single stroke valve to allow liquid flow to exit through it from the chamber only. Opening for communicating to pump is also available. Each of the inlet main pipe segments connects container to inlet opening of valve unit. Connecting main pipe segment joins openings of two valve units communicating to the pump. The outlet main pipe segment is connected to outlet opening of each valve unit for supplying liquid to a patient. The pump is connected to connecting main pipe segment. Liquid is sucked in sequentially from one or other container. EFFECT: high level of safety in sequentially supplying two liquids. 9 cl, 4 dwg
