A pipette for use with a pipette, tip or syringe, including a piston positioned within a cylinder comprises a pipette housing extending between an upper end and a lower end. Two parallel rods are positioned in the pipette housing, wherein one of the two parallel rods is coupled to a lifting rod. An operating element is configured to protrude outwardly from the pipette housing and be displaced relative to the pipette housing. A gear mechanism is arranged in the pipette housing and comprises a drive comprising a moveable input member and configured to be driven by the operating element, and an output comprising at least one moveable output member and configured to drive the two parallel rods. Successive displacements of the input member by the operating element are configured to alternately displace one of the two parallel rods and then another of the two parallel rods by the output member.

An object of the present invention is to provide a dispensing device that can inhibit a dead volume from occurring and can dispense a liquid of a small quantity with a high degree of accuracy while reducing the variation of dispensing quantities. A dispensing device according to the present invention has a detachable dispensing tip and the dispensing tip has a configuration of arranging a plunger in a hollow part of a metal pipe (refer to FIG. 2).

In a capillary of a pipette, first and second ends in a longitudinal direction are opened. A pressure chamber communicates through the second end with an internal portion of the capillary. A driving part changes a volume of the pressure chamber. A control part outputs a first signal driving the driving part so that the volume of the pressure chamber increases and liquid is suctioned from the first end. A suction signal in the first signal drives the driving part so that the volume of the pressure chamber increases from a volume before suction of the liquid by a first increase amount to become a post-suction volume. A brake signal is output following the suction signal and drives the driving part so that the volume of the pressure chamber is reduced from the post-suction volume by an amount which is smaller in absolute value than the first increase amount.

Described are exemplary embodiments of a handheld, powered positive displacement pipette assembly, including a plurality of syringes of different volumes and a powered positive displacement pipette having unique mechanisms for the retention, identification and ejection of said syringes.

The present invention defines a positioning assembly including a base part (110) and a holder part (120) for holding a device, whereby the assembly further includes a motor (160) for driving a displacement mechanism (150) mounted to the base part. The base part and the holder part are arranged parallel to each other and are connected via a displaceable slide link (140), which is configured to slide on a first guide rail (111) provided on the base part and on a second guide rail (122) provided on the holder part, whereby each guide rail extends in longitudinal direction (z). The slide link (140) is coupled to the displacement mechanism (150), which causes displacement of the slide link relative to the base part in longitudinal direction. Furthermore, the holder part (120) is moveably coupled to the base part (110) via a coupling arrangement which has a first element (115) provided on the base part, a second element (125) provided on the holder part and a third element provided on the slide link (140). The first, second and third elements of the coupling arrangement are configured to engage with each other such that linear displacement of the slide link (140) relative to the base part (110) in one direction causes linear displacement of the holder part (120) relative to the slide link in the same linear direction.

A linear actuator (10) for use in a modular assembly of such actuators comprises an actuator body (11), a shaft (12) guided by the body to be displaceable relative thereto in the sense of tlte longitudinal axis (13) of the shaft and a drive motor enclosed in the body and operable to axially displace the shaft relative to the body in two mutually opposite directions. The body has two mutually opposite sides (15a, 15b) respectively lying in two substantial parallel spaced-apart planes, which each represent a reference plane for positioning the body side-by-side with the body of another such actuator, and a further side (17b) connecting the two mutually opposite sides and stepped to form a projection (18) receiving the shaft (12) with the axis (13) parallel to the two planes and a rebate (19) beside the projection to permit the body to interlock with the body of another such actuator at that further side. The projection (18) and rebate (19) are of substantially the same width in the sense of the spacing of the two planes and the shaft (12) is disposed substantially centrally of the projection (18) so that when the body (11) is interlocked with that of another such actuator the pitch of the shaft axes (13) is equal to that width.

Various embodiments include a system having a pipetting chamber, a set of pipettor cartridges docked in the pipetting chamber, a gantry system mounted on a ceiling within the pipetting chamber, the gantry system including at least one stationary track aligned in a first direction, and a movable track aligned in a second direction distinct from the first direction, the movable track coupled to the at least one stationary track, and a carrier configured to transport each of the set of pipettor cartridges to a pipetting location within the pipetting chamber, the carrier configured to move each pipettor cartridge in a third direction perpendicular to both the first and second directions.

In an embodiment, an immunochemistry analysing system includes a source of paramagnetic particles, a source of fluid, a cuvette configured to receive the paramagnetic particles and the fluid, a pipette configured to (i) translate so that at least a portion of the pipette is located within the cuvette and (ii) dispense at least one of the paramagnetic particles and the fluid into the cuvette so that the paramagnetic particles and the fluid can be mixed within the cuvette, a motor configured to move the pipette while located in the cuvette, and a control unit configured to vary a motor drive of the motor to cause the pipette to mix the fluid with the paramagnetic particles within the cuvette.

An auto-pipetting apparatus includes a dispensing head with at least one pipetting tip mandrel having an elongated stud body with an insertion end. The at least one pipetting tip mandrel mates with a pipetting tip. A first adjustable seal, disposed on the elongated stud body, and a second adjustable seal, disposed on the elongated stud body, seal the pipetting tip mated to the at least one pipetting tip mandrel. The first adjustable seal defines a snub surface. The snub surface effects a substantially continuous circumferential contact seal with radially impinging contact between the pipetting tip and the at least one pipetting tip mandrel. The second adjustable seal is adjustable between a disengaged position and an engaged position and effects a releasable grip and another substantially continuous circumferential contact seal between the pipetting tip and the at least one pipetting tip mandrel around the pipetting tip.

A nucleic acid extraction apparatus having a workbench having a table top, and further comprises a sliding seat, a sample rack, a reagent strip rack, a pipetting table, a piston assembly and a suction assembly. The nucleic acid extraction apparatus comprises the sliding seat and the pipetting table, the sample rack and the reagent strip rack are arranged on the sliding seat, the piston assembly and the suction assembly are respectively arranged on the pipetting table, the sample rack is provided with sample holes, the reagent strip rack is provided with accommodation slots, the number of accommodation slots corresponds to that of the sample holes on a one-to-one basis, and when reagent strips are respectively accommodated in the accommodation slots, a first suction head hole, second suction head holes and various reagent holes in each reagent strip respectively correspond to the corresponding sample holes.