Patent ID: 9566580
Date: 2017-02-14
CPC Classifications: B01L,G01N,Y10T

Claim:
1. A pipette comprising: At least one aspiration channel with a piston, the aspiration channel comprising a lower end, An extension channel formed as an extension at the lower end of the aspiration channel, the extension channel comprising a lower end, A pipette tip mounting piece formed at the lower end of the extension channel, A pipette tip attached to the pipette tip mounting piece, A surrounding groove formed on an outer surface of the pipette tip mounting piece, the groove comprising lower and upper surfaces and having a depth which decreases in an axial direction from the bottom surface thereof towards an upper end of the upper surface thereof so as to establish a region of decreased groove depth at the upper end of the upper surface thereof, and A single O-ring seal positioned for movement within the groove in the axial direction between the lower and upper surfaces thereof in response to the mounting piece being pushed into the pipette tip to cause the o-ring seal to thereby be pushed upwardly in the groove toward the upper end of the upper surface of the groove and be deformed in the region of decreased groove depth to establish a seal between the mounting piece and the pipette tip, wherein The groove has a width in an axial direction of the mounting piece which is at least 1.1 times a thickness of the o-ring seal in the axial direction.