PIPETTE FOR WITHDRAWING LIQUID BY BACK AND FORTH MOTION OF THE PISTON

摘要

The present invention relates to a withdrawal pipette (100) designed so that the movement of a piston (12) along one of its sliding directions (36, 38) simultaneously leads to the increase of the volume in a lower chamber (20) and the reduction of the volume in an upper chamber (22), and vice versa, the pipette additionally comprising fluid communication means (40) that alternately make it possible to establish a first fluid communication (A) between the lower chamber (20) and a channel emerging from a nozzle (28) isolated from this lower chamber, and a second fluid communication (B) between the upper chamber (22) and this same channel (28).