Disposable medical flow-regulating device and system

A disposable medical flow-regulating device, comprising:

• a first cylindrical flow-director and a second cylindrical flow-director, each of the first and second cylindrical flow-directors including
• a pan-shaped hollow housing having a circular bottom wall and a side wall around an outer perimeter of the circular bottom wall, with a plurality of tube attachment fittings extending out of an outer surface of the side wall, each of the tube attachment fittings being in fluid communication with an interior cavity of the pan-shaped hollow housing,
• a first tube attachment fitting of the plurality of tube attachment fittings having a position closer to the circular bottom wall than all others of the plurality of the tube attachment fittings, and
• a rotary insert that is configured to rotate within the interior cavity of the pan-shaped hollow housing, the rotary insert having a peripheral wall with a height that is less than a height of the side wall of the pan-shaped hollow housing, such that the peripheral wall occludes the others of the plurality of the tube attachment fittings but does not occlude the first tube attachment fitting when the rotary insert is fully inserted into the pan-shaped hollow housing, and the rotary insert having a notch in the peripheral wall that allows a selected one of the others of the plurality of the tube attachment fittings to fluidly communicate with the first tube attachment fitting when the notch is positioned adjacent to the selected one of the others of the plurality of the tube attachment fittings;
• a pumping tube segment compatible with a peristaltic pump, the pumping tube segment extending from the first tube attachment fitting of the first cylindrical flow-director to a first tube attachment fitting of the second cylindrical flow-director to establish a fluid flow path between the first and the second cylindrical flow-directors;
• fluid delivery tubes connected to the others of the plurality of the tube attachment fittings of each of the first and second cylindrical flow-directors such that selectable flow paths between the fluid delivery tubes are defined by rotating a respective rotary insert.