PROCESS AND DEVICE FOR THE CONVEYANCE AND MEASURING OF MEDICAL LIQUIDS

摘要

The invention concerns a process and a device for the combined conveyance and volume measuring of liquids. The conveyance is performed by imparting an overpressure or, respectively, a negative pressure to the liquid by means of a pressurized or depressurized gas cushion. A piston (15) movable in a cylinder (13) which is connected with a receiver (5) containing the liquid exerts either a constant overpressure upon a gas cushion above the liquid to drive the liquid through a line (14) connected with the receiver, or it exerts a constant negative pressure upon the gas cushion to draw the liquid from the line into the receiver. The transported volumes of the liquid are determined by the volumina covered by the piston in the course of its displacements in the cylinder.