Rotary mixing valve

Claim 1

A value for selectively communicating any one of a plurality of available fluids into an infusion tube, the valve comprising: a hollow cylindrical housing having planar end surfaces and having a plurality of radially disposed ports forming fluid input sites in the curved surfaces of said housing; a central cylindrical core disposed within the hollow housing having a passageway adapted to be aligned with any selected one of the fluid input sites and having a fluid conduit in communication with the passageway which projects exterior of the housing at one planar end of the housing; a source of primary fluid communicating the fluid through the other planar end of the housing between the interior wall of the housing and the core; and at least one groove in the interior wall of the housing intersecting a fluid input site so that primary fluid will flow through the core when the passageway is aligned with the fluid input site and so that introduction of at least one secondary fluid through the input site into the passageway simultaneously with the primary fluid is possible.