Metering head, metering device comprising metering head and method for metering by means of metering head

Abstract

The invention relates to a metering head for an automatic metering machine or another metering device, comprising a carrier, on which several parallel attachments for holding pipette tips are arrangedadjacent to each other, wherein each attachment has the following features of a tube, which has a supporting protrusion at the lower end, which supporting protrusion protrudes outward and extends peripherally at least partially, at least one sleeve which surrounds the tube and can be axially moved on the tube, and at least one elastomeric o-ring which surrounds the tube and is arranged adjacent to the lower end of the sleeve; a pressure plate which is arranged above the sleeves and which has a plurality of first holes, through which the tubes extend, wherein the pressure plate can be moved along the tubes from a release position at a first distance from the supporting protrusions to a clamping position at a second distance from the supporting protrusions that is smaller than the first distance and wherein the pressure plate presses against the upper edge of the adjacent sleeves of all attachments in the clamping position in such a way that the sleeves are pressed, at the lower ends, against the adjacent o-rings and the o-rings are expanded in order to fixedly clamp pipette tips slid onto the attachments; a first moving apparatus which is connected to the pressure plate and is designed to move the pressure plate between the release position and the clamping position.

Description

technical field [0001] The present invention relates to a metering head for simultaneously accommodating multiple pipette tips, a metering device comprising a metering head for simultaneously accommodating a plurality of pipette tips and a metering device for simultaneously accommodating multiple The method by which the metering head of a pipette tip measures liquids. Background technique [0002] Dosing devices ("pipetting devices") with a dosing head ("pipetting head") for simultaneously accommodating several pipette tips ("pipetting devices") for dosing liquids, especially in medical, biological, biochemical or chemical laboratories . [0003] A dosing head for simultaneously accommodating a plurality of pipette tips has a plurality of parallel sleeve openings arranged next to one another, which can be inserted into sleeve openings at the upper end of the pipette tips. Liquid is absorbed into the pipette head and delivered from the pipette head through the tip opening a...

AI Technical Summary

Problems solved by technology

The operating mechanism for clamping and releasing pipette tips on the collar is complex and has high space requirements

Manufacturing tolerances or imprecise positioning of the pipette tip on the collar can easily prevent the setting of the pipette tip in a defined coupling position

Annular grooves and axial positioning mechanisms limit the use of different pipette tips

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