Rinsing, cleaning and disinfecting dialysate preparation and supply apparatus

Claim 1

Dialysate preparation and supply apparatus having a water intake port, a concentrated dialysate solution intake connector, dialysate connectors for delivering fresh dialysate to and removing spent dialysate from a dialyzer, and system pumps for pumping liquids through hydraulic circuitry connected to said intake ports, said hydraulic circuitry including said dialysate connectors, said apparatus further comprising a cleaning and/or disinfecting system comprising a chemical intake port on an accessible exterior surface of said apparatus for connection to sources of different treatment liquids, one at a time, said port being connected to said hydraulic circuitry, means for regulating the flow of liquid from said chemical port into said hydraulic circuitry, means for providing a plurality of keyholes corresponding to said different treatment liquids in said exterior surface at different locations, each said keyhole being adapted to receive a corresponding key on a treatment liquid connector connected to a source of one said treatment liquid, each said keyhole being adapted to not receive any key corresponding to any other said treatment liquid, means associated with said keyholes for sending electrical signals indicating the presence of a said key in a corresponding said keyhole, and electrical control means for controlling said pumps and said means for regulating, to pump one of said different treatment liquids for a specific period of time and at a specific flowrate depending on which keyhole has a key in it.