Abstract: A pipettor having a common drive motor for aspiration/dispensing and tip ejection is disclosed. A liquid end shaft has a distal end for receiving a disposable pipette tip. A drive motor is operatively connected to a piston for driving the piston axially to cause the aspiration/dispensing. A push off structure is selectively couplable to move with the piston and is driven by the drive motor to enable ejecting the disposable pipette tip received thereon from the pipettor.

Abstract: Described are exemplary embodiments of a syringe for use with a handheld positive displacement pipette. The syringe includes a piston having a piston tip that is significantly truncated in comparison to the tips of known positive displacement pipette syringes, and also shorter in length than the dispensing tip of the syringe. The design of the piston tip and its interaction with the syringe dispensing tip results in a substantial reduction in the fluid drag associated with dispensing liquid from a typical positive displacement pipette syringe.

Abstract: Described are exemplary embodiments of a syringe for use with a handheld positive displacement pipette. The syringe includes a piston having a piston tip that is significantly truncated in comparison to the tips of known positive displacement pipette syringes, and also shorter in length than the dispensing tip of the syringe. The design of the piston tip and its interaction with the syringe dispensing tip results in a substantial reduction in the fluid drag associated with dispensing liquid from a typical positive displacement pipette syringe.