A kind of flowing group, the flowing group include check valve and can two kinds of fluids be applied to patient successively from a pair of of container.Predetermined rupture (threshold value) pressure of the check valve is that the inlet pressure of the first flowing instruction occurs, and can individually be set as predetermined value to minimize and/or prevent described two fluids free flows dynamic.A part for the flow path of the flow path and the second fluid that pipeline section is the first fluid is connected, and pumps and may be connected to the connection pipeline section.By inverting the pumping direction of the pump, described two fluids can in turn be pumped out from the pair of container, and be therefore applied to patient successively.
