Liquid transfer devices.

摘要

A liquid transfer device of disposable one-time use form to conduct a biochemical diagnostic or other assay comprises two liquid flow channels (10,110,210; 20,120,220) leading from a respective pair of channel ends to a site (30,130,230) in a common channel portion into which the channels merge, and operable to deliver liquid to this site in sequentially timed manner following simultaneous application of such liquid to the channel ends, at least the one of the channels delivering liquid with a relative delay being connected to the common channel portion in a substantially symmetrical manner, at least from an hydraulic point of view during operation relative to the flow in the common channel. Typically respectively different reagents (11,111,211; 21,121,221) are incorporated in the two channels, and a third reagent (31,131,231) at the common site, whereby a sample to be assayed in respect of a particular content can be applied to the site, immobilised by the third reagent, subsequently subjected to one channel reagent to detect any of the content of interest, and finally subjected to the other channel reagent to exhibit for the user any detected content.