US 11,951,471 B2
Pipette for use with a pipette tip or syringe having a piston and a cylinder
Marc Wilth, Hamburg (DE); Dana Tuchscherer, Buchholz i.d. Nordhelde (DE); Matthias Kunsch, Hamburg (DE); Florian Tesch, Hamburg (DE); and Burghardt Reichmuth, Hamburg (DE)
Assigned to Eppendorf AG, Hamburg (DE)
Filed by Eppendorf AG, Hamburg (DE)
Filed on Jun. 22, 2021, as Appl. No. 17/354,193.
Claims priority of application No. 20181406 (EP), filed on Jun. 22, 2020.
Prior Publication US 2021/0394170 A1, Dec. 23, 2021
Int. Cl. B01L 3/02 (2006.01); G01N 35/10 (2006.01)
CPC B01L 3/0227 (2013.01) [B01L 3/0282 (2013.01); G01N 35/1011 (2013.01); B01L 2200/0605 (2013.01); B01L 2200/087 (2013.01); B01L 2400/0478 (2013.01)] 17 Claims
OG exemplary drawing
 
1. A pipette for use with a pipette tip or syringe including a piston positioned within a cylinder, the pipette comprising:
a pipette housing comprising a stem shape and extending between an upper end and a lower end;
a first retaining apparatus positioned at the lower end of the pipette housing and configured for releasable retention of the cylinder;
a lifting rod positioned within the pipette housing and comprising a second retaining apparatus at the lower end of the pipette housing configured for releasable retention of an upper end of a piston rod of the piston and further configured to displace a sealing region of the piston in a piston running region above a tip opening at the lower end of the cylinder,
two parallel rods positioned in the pipette housing, wherein one of the two parallel rods is coupled to the lifting rod;
a deflection apparatus configured to couple the two parallel rods together, wherein the two parallel rods are configured to be simultaneously displaced in opposing directions;
an operating element configured to protrude outwardly from the pipette housing and configured to be displaced relative to the pipette housing in an axial direction of the lifting rod; and
a gear mechanism arranged in the pipette housing and comprising,
a drive comprising a moveable input member and configured to be driven by the operating element, and
an output comprising at least one moveable output member and configured to drive the two parallel rods,
wherein successive displacements of the moveable input member from the same initial position by the operating element is configured to alternately displace one of the two parallel rods and then another of the two parallel rods by the at least one moveable output member,
wherein the at least one moveable output member of the gear mechanism is a driver element configured to be displaced alternately into a position above one of the two parallel rods and to displace the one of the two parallel rods downwardly, and wherein the driver element is configured to subsequently be displaced into a position above another of the two parallel rods and to displace this rod downwardly,
wherein the driver element is a wing disk rotatably mounted about an axis parallel to the two parallel rods, and wherein successive displacements of the input member from an initial position is able to be positioned alternately with a wing above one of the two parallel rods and at a same time with an undercut above another of the two parallel rods, and with an undercut above the one of the two parallel rods and at the same time with a wing above the other of the two parallel rods.