Abstract: An assembly for a positive displacement sampling device, the assembly comprising a tip and an ejector, the tip comprising a body, a mobile capillary retention portion connected to the body by a connector, and a lever secured to the mobile portion, such that moving this portion radially inwards, via the connector, leads to the lever moving radially outwards, the ejector being equipped with a locking member which engages with the lever such that, in the top position of the ejector, the locking member assumes a locking position in which it holds the mobile portion in an active capillary retention position by preventing the lever from moving radially outwards and, during the ejection travel, the locking member permits the lever to move radially outwards.

Abstract: A device for a multi-channel pipetting system, comprising a piston holder, a guide rod of the piston holder, which guide rod is mounted slidably in a guide member, a plurality of pistons having a bottom end housed slidably in a suction chamber, and a piston head mounted on the piston holder by way of a mechanical connection. The mechanical connection comprises two contact points which conjointly define a piston-head rotation axis oriented orthogonally with respect to the transverse direction and to the longitudinal central axis of the pipetting system, and the device additionally comprises, associated with the piston, return spring which force the piston head upward against the piston holder, so as to establish the two contact points.

Abstract: A pipette for sampling an extended range of volumes of liquid includes a fixed pipette body. An operating rod is movable in translation relative to the pipette body, along a longitudinal axis of the pipette. The pipette includes a suction chamber and a set of N concentric pistons, wherein N corresponds to an integer greater than or equal to 2. Each of the pistons contributes to delimiting the suction chamber. A coupling module couples the operating rod with the set of N concentric pistons. The module is configured in such a way as to be able to be brought into N distinct configurations in which it respectively couples the operating rod with 1, 2, . . . , N pistons.

Abstract: In order to increase the compatibility of a pipetting system tip with various types of cones, the invention provides a tip comprising a first group of first cone retention elements defining a first maximum outer diameter; a second group of second cone retention elements defining a second maximum outer diameter; a third group of third cone retention elements defining a third maximum outer diameter. The first maximum outer diameter and the second maximum outer diameter being different so as to together define a first tip portion having a first conicity, and the second maximum outer diameter and the third maximum outer diameter being different so as to together define a second tip portion having a second conicity smaller than the first conicity.

Abstract: In order to improve the ergonomics of a sampling pipette, the invention provides a control member intended to occupy a nominal central position in which a spring brings a locking member into the locking position thereof of the system for adjustment of the volume to be sampled, the member being able to be axially displaced towards each of the two following positions: a low position for ejecting a cone, in which the control member presses on the cone ejector, the movement from the nominal central position to the low position being carried out against the springs; and a high position for unlocking the braking ring, the movement of the control member from the nominal central position to the high position driving a disengagement element to move the locking member against the spring, until release of the braking ring.

Abstract: A control button (12) for a manually actuated sampling pipette, the button including lower and upper parts (24a, 24b), one of which is equipped with a force sensor (31) and the other with an actuating member (30). In the vertical position of the button, in a state not subjected to a force, not only does the member (30) ensure that the upper part is retained axially on the lower part (24a), but these parts also define a circular axially retaining connection (42) therebetween, the circular connection exhibiting an axial clearance (47) configured such that, when a pressure is exerted on an off-centre action zone (102a) by the thumb of an operator, the axial clearance (47) is taken up in this zone (102a), while the connection (42) retains a reaction zone (102b), arranged diametrically opposite the action zone (102a), axially and locally relative to the lower part (24a).

Abstract: The invention relates to a device (32) for the bottom part of a multichannel pipetting system, comprising two sampling-cone-holding end pieces (6) and also two aspiration chambers (36a, 36b) that engage respectively with the two end pieces, the two aspiration chambers (36a, 36b) being concentric.

Abstract: In order to increase the compatibility of a pipetting system tip with the various types of cones, the invention provides that this tip comprises: —a first group of first cone retention elements defining a larger external diameter; —a second group of second cone retention elements defining a larger external diameter; —a third group of third cone retention elements defining a larger external diameter. The diameter and the diameter being different so as to together define a first tip portion having a first conicity, and the diameter and the diameter being different so as to together define a second tip portion having a second conicity smaller than the first.

Abstract: In order to extend the operating range of a withdrawing pipette, the invention provides: —a fixed pipette body; —an operating rod movable in translation relative to the pipette body, along a longitudinal axis of the pipette; —a suction chamber; —a set of N concentric pistons, N corresponding to an integer greater than or equal to 2, each of the pistons contributing to delimiting the suction chamber; and —a coupling module coupling the operating rod with the set of N concentric pistons, the module being configured in such a way as to be able to be brought into N distinct configurations in which it respectively couples the operating rod with 1, 2, . . . , N pistons.

Abstract: In order to improve the ergonomics of a sampling pipette, the invention provides a control member intended to occupy a nominal central position in which a spring brings a locking member into the locking position thereof of the system for adjustment of the volume to be sampled, the member being able to be axially displaced towards each of the two following positions: a low position for ejecting a cone, in which the control member presses on the cone ejector, the movement from the nominal central position to the low position being carried out against the springs; and a high position for unlocking the braking ring, the movement of the control member from the nominal central position to the high position driving a disengagement element to move the locking member against the spring, until release of the braking ring.

Abstract: A control button (12) for a manually actuated sampling pipette, the button including lower and upper parts (24a, 24b), one of which is equipped with a force sensor (31) and the other with an actuating member (30). In the vertical position of the button, in a state not subjected to a force, not only does the member (30) ensure that the upper part is retained axially on the lower part (24a), but these parts also define a circular axially retaining connection (42) therebetween, the circular connection exhibiting an axial clearance (47) configured such that, when a pressure is exerted on an off-centre action zone (102a) by the thumb of an operator, the axial clearance (47) is taken up in this zone (102a), while the connection (42) retains a reaction zone (102b), arranged diametrically opposite the action zone (102a), axially and locally relative to the lower part (24a).

Abstract: A device for controlling pipetting and adjusting a volume to be sampled, including a pipetting control member; rotary actuating means coupled to the control member; a linking member slidably mounted on the actuating means, the linking member being connected to a piston; volume adjusting means; rotary means defining, for the linking member, a spiral-shaped guiding path, the rotary means being coupled to the adjusting means so that their actuation causes a rotation of the means about a second axis which the guiding path is centered, this rotation leading to a displacement of the linking member along the path, and to a sliding of the member relative to the actuating means.

Abstract: The invention relates to a device (32) for the bottom part of a multichannel pipetting system, comprising two sampling-cone-holding end pieces (6) and also two aspiration chambers (36a, 36b) that engage respectively with the two end pieces, the two aspiration chambers (36a, 36b) being concentric.

Abstract: A device for controlling pipetting and adjusting a volume to be sampled, including a pipetting control member rotary actuating means coupled to the control member; a linking member slidably mounted on the actuating means, the linking member being connected to a piston; volume adjusting means; rotary means defining, for the linking member, a spiral-shaped guiding path, the rotary means being coupled to the adjusting means so that their actuation causes a rotation of the means about a second axis which the guiding path centered, this rotation leading to a displacement of the linking member along the path, and to a sliding of the member relative to the actuating means.