Dosing device for supplying e.g. washing liquid to blood sample chamber for analytical tasks for patient, has pistons arranged behind each other in pipe, where fluids flow between pistons and escape out from opening and arrive into chamber

摘要

The device has pistons (K1-K6) e.g. injection pistons, arranged behind each other in a pipe (1). Volumes of fluids (F1-F5) flowing through a pipe diameter and a piston space are determined. A feeding mechanism displaces one of the pistons for controllably delivering the fluids. A threaded spindle (7) displaceably acts on one of the pistons far from a side opening (3) in the pipe during activation such that other pistons are displaced due to incompressibility of the fluids. The fluids flow between the pistons and escape out from the side opening and arrive into a sample chamber (2).