Liquid-metering device for ballistically discharging metered amounts in the nanoliter range, liquid-metering method and pipetting tip therefor

A liquid-metering device for ballistically dispensing a discrete dosage amount of a dosage liquid in a dosage volume range of 0.3 nl to 900 nl from a dosage liquid supply, comprising:

• a pipetting-tip mounting device defining in at least one ready-to-use operating position of the liquid-metering device a mounting space extending along a virtual mounting axis that is configured to accommodate a portion of the pipetting tip
• a release tappet movable relative to the pipetting-tip mounting device, which can be displaced between a standby position further retracted from the mounting space to a release position further projecting into the mounting space,
• a displacement drive having a motion-transmitting coupling to the release tappet, configured to intermittently displace the release tappet, at least from the standby position to the release position, and
• a control device connected to the displacement drive for controlling the operation of the displacement drive based on signal transmission,
• wherein the liquid-metering device comprises a first and a second deformation formation, wherein the first and the second deformation formation define between them an axial longitudinal section of the mounting space as a deformation area, in which the first and second deformation formation can be converged and retracted from each other, wherein the release tappet in its release position is located in the deformation area of the mounting space.