Patent ID: 7641859

Claim:
A pipette system, comprising: a tubular pipette tip having an upper section surrounding a locking chamber, and a body section leading from said upper section and tapering downwardly to a reduced diameter end; a tubular mounting shaft on said pipette, said mounting shaft having a distal end configured and dimensioned for axial insertion into said locking chamber; coacting surfaces on the distal end of said mounting shaft and said upper section for establishing an axially interengaged relationship between said pipette tip and said mounting shaft in response to insertion of the distal end of said mounting shaft into said locking chamber; and a sleeve movable relative to said mounting shaft between a retracted position accommodating the establishment of said axially interengaged relationship, and an advanced position for disrupting said interengaged relationship to thereby accommodate axial ejection of said pipette tip from said mounting shaft; wherein, in said advanced position, said sleeve is disposed between an inner surface of the upper section of said pipette tip and an outer surface of said tubular mounting shaft of said pipette so as to engage and deflect the inner surface of the pipette tip relative to the outer surface of the mounting shaft to eject said pipette tip.