Patent ID: 9086394
Filing Date: 2015-07-21
Classification: G01N

Abstract:
1. A multi-function dispense head, comprising: a pipette housing having a plurality of vertically extending pipette rod passages through the housing and pipette rods, each pipette rod disposed in one vertically extending passage and extending past a lower surface of the housing, the pipette rods removably connected to pipette tips, and a pair of ledge contactable pistons movably disposed within a pair of piston openings in the pipette housing; a movable head having a lower ledge along a bottom portion of the movable head, the lower ledge disposed beneath the lower surface of the pipette housing and having openings through which pipette rods pass in vertical alignment with the pipette passages, each opening having a diameter slightly smaller than a diameter of an upper portion of a pipette tip, the movable head vertically movable relative to the pipette housing; and a vertically movable motor driven carriage, the carriage operable to push the ledge contactable pistons through the piston openings from an upper position out of contact with the lower ledge to a lower position in contact with the lower ledge, thereby moving the movable head downwardly and urging the lower ledge against pipette tips to eject pipette tips.