Method and device for the metering, dilution and deproteinisation of biological fluids

摘要

The invention relates to a method and a device for the metering, dilution and deproteinisation of biological fluids in a single step in that a cannula (3) through which a defined amount of sample is usually aspirated and ejected again together with a subsequent diluting solution, is surrounded in its upper part by a short annular space (5) which is connected to a metering device (11) for a deproteinisation agent. The deproteinisation agent is forced through the outlet opening of the annular space (5) simultaneously with the ejection of the sample and the diluting solution and flows along the outer surfaces of the cannula (3) as a result of which the latter is cleaned in such a way that there is no interfering carryover of sample even without further cleaning steps. Contact of the three components at the tip of the cannula leads to sufficient mixing on running into the sample container. <IMAGE>