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US 8,297,134 B2Granted
Pipetting device
AssigneeEppendorf AG
InventorJens Wilmer
Life of this patent
Estimating the term…
Abstract
The present invention is related to a pipetting device with a throw-off system for detachably connecting with at least one pipette tip, at least one displacement device, a driving device for driving a displacement member of the displacement device and an adjustment device with a lead screw nut and a lead screw for adjusting the metering volume.
Claims26
A pipetting device with
- means (6) for detachably connecting with at least one pipette tip (7) and at least one displacement device (9, 10) having a displacement chamber (9) and a displacement member (10) movably arranged therein, for sucking in and ejecting liquid into and out of the at least one pipette tip (7), or means for detachably connecting with at least one syringe with a cylinder and a plunger relocatable therein,
- a lifting rod (15) for driving the displacement member (10) or the plunger of the at least one syringe,
- with a driving means (14) for driving the lifting rod (15),
- an adjustment device (5) for adjusting the metering volume with a lead screw nut (17) and a lead screw (16), wherein one of the components lead screw nut (17) and lead screw (16) is stationary with respect to the displacement chamber (9) or the cylinder of the connected syringe, and the other component is screwable with respect to the stationary component and has a stop (28), to which a counter-stop (27) of the lifting rod (15) is related,
- wherein the lead screw (16) has a first external thread (23.1) and at least one further external thread (23.2) with a thread form shaped different than that of the first external thread (23.1), and the lead screw nut (17) has at least one related internal thread (24), and
- wherein on the further external thread (23.2) of the lead screw (16) the lead screw nut (17) features at least in parts a distance (d) to the lead screw (16) in the radial direction (R) to the axis (A) of the lead screw (16) in the level (h) of the outer diameter and/or inner diameter of the external thread (23.2, 23) of the lead screw (16).
3 more elements
A pipetting device with
- means (6) for detachably connecting with at least one pipette tip (7) and at least one displacement device (9, 10) having a displacement chamber (9) and a displacement member (10) movably arranged therein, for sucking in and ejecting liquid into and out of the at least one pipette tip (7), or means for detachably connecting with at least one syringe with a cylinder and a plunger relocatable therein,
- a lifting rod (15) for driving the displacement member (10) or the plunger of the at least one syringe,
- with a driving means (14) for driving the lifting rod (15),
- an adjustment device (5) for adjusting the metering volume with a lead screw nut (17) and a lead screw (16), wherein one of the components lead screw nut (17) and lead screw (16) is stationary with respect to the displacement chamber (9) or the cylinder of the connected syringe, and the other component is screwable with respect to the stationary component and has a stop (28), to which a counter-stop (27) of the lifting rod (15) is related,
- wherein the lead screw nut (17) has a first internal thread (24.1) and at least one further internal thread (24.2) with a thread form shaped different than that of the first internal thread, and the lead screw (16) has at least one related external thread (23), and
- wherein on the further internal thread (24.2) of the lead screw nut (17), the lead screw nut (17) features at least in parts a distance (d) to the lead screw (16) in the radial direction (R) to the axis (A) of the lead screw (16) in the level (h) of the outer diameter and/or inner diameter of the external thread (23.2, 23) of the lead screw (16).
3 more elements
Dependencies are inferred from the claim text.