Patent ID: 8071049
Filing Date: 2011-12-06
Classification: B01L

Abstract:
1. A pipetting device comprising: a coupling unit for coupling to a pipette tip comprising a first end with a fluid opening and a second end having a pipe elastic in the radial direction with an orifice, wherein the orifice and the fluid opening are in fluid connection, and wherein the first end is designed to be coupled to the coupling unit, the elastic pipe having such dimensions that the elastic pipe itself behaves substantially rigid with respect to bending along the pipe axis, but is flexible and elastic with respect to radial deformations; a first actuating unit for generating a negative pressure at the fluid opening at the first end of the pipette tip to suck in liquid through the orifice of the elastic pipe in the axial direction; a second actuating unit for changing the volume of a portion of the pipe elastic in the radial direction in time to thereby eject liquid as droplets or as a free-flying jet from the orifice of the elastic pipe in the axial direction; and the pipe elastic in the radial direction providing a substantially constant inner cross-section up to the orifice.