Patent ID: 9687841
Date: 2017-06-27
CPC Classifications: B01L,G01N,G01R

Claim:
1. A pipetting device for removing sample fluid from a sample vessel that is sealed on a top side with a septum, comprising: a pipetting needle and an auxiliary cannula configured to pierce the septum and to guide the pipetting needle axially through the auxiliary cannula, a guide arm on the lower end of which is arranged an end plate configured to axially displace along the guide arm against a resilient resistance, a centering device configured to insert into the end plate of the guide arm and having a radial outside surface disposed around a circumference on the centering device, and at least three centering fingers with conical bevels constructed on the radial outside of the centering device, distributed around the circumference of the centering device, forming a holding-down device for the sample vessel, and configured to engage around the top side of the sample vessel and from outside the sample vessel.