Abstract: Capillary flow liquid transfer device having first and second flow channels, the first leading from a first channel end to a volume determination site and the second flow channel leading from a second channel end and crossing the first channel in fluid connection therewith in an interception area bordering the volume determination site directly upstream thereof relative to the flow in the first channel. The liquid flow in the second channel reaches the interception area before that in the first channel upon simultaneous application of liquid from the liquid supply to the first and second channel ends such that excess substance is received in a waste reception area separate from substance received in the volume determination site.

Abstract: The present invention relates to a device for performing biochemical diagnostic assays. The device, which is preferably provided in a self-contained disposable form for use in extra-laboratory conditions, comprises two liquid flow channels of porous material which transfer liquid by capillary flow to a common site in sequentially timed manner following simultaneous application of the liquid to the ends of the channels. The channels interconnect at a certain point and then both continue in an arrangement analogous to an electrical bridge circuit. By selecting the hydraulic resistances of the arms of this circuit the flow can be controlled across the bridge. Balancing the circuit will produce null flow across the bridge and prevent the flow from one channel from dominating that from the other when the channels are saturated. Alternatively the arrangement can be such as to produce oscillating flow across the interconnection.

Abstract: The present invention relates to a device for performing biochemical diagnostic assays. The device, which is preferably provided in a self-contained disposable form for use in extra-laboratory conditions, has two liquid flow channels of porous material which transfer liquid by capillary flow to a common site in sequentially timed manner following simultaneous application of the liquid to the ends of the channels. The channels are formed by superposed layers of porous material separated by an impervious layer except for one or more areas over which the layers are engaged for liquid flow therebetween. A number of channel pairs can be formed in the layers for simultaneously performing plural test procedures.