Pipette for use with a pipette tip with an integrated plunger

A pipette for use with a pipette tip with an integrated tip plunger, the pipette comprising:

• a pipette housing extending from a lower end to an upper end;
• a neck extending from the lower end of the pipette housing and configured to hold a pipette tip;
• a stroke rod comprising an upper end and a lower end and configured to displace a tip plunger in the pipette tip, wherein the stroke rod comprises a receiving portion positioned at the lower end of the stroke rod and configured to receive an upper end of the tip plunger of the pipette tip that is held on the neck;
• a drive apparatus configured to displace the stroke rod to:
• (1) aspirate a liquid specimen into the pipette tip held on the neck;
• and (2) to eject the specimen. from the pipette tip by means of a tip plunger positively connected to the stroke rod;
• and
• at least one locking sleeve arranged coaxially with the stroke rod and configured to be displaceably guided toward the stroke rod in the pipette housing,
• wherein one of:
• (1) the at least one locking sleeve is configured to be moved into a locked position in which the at least one locking sleeve borders, on an outside, a lower end of the stroke rod that is configured to expand when the upper end of a tip plunger is inserted into a portion of the stroke rod;
• and (2) an upper end of the tip plunger is configured to expand when the lower end of the stroke rod is inserted into a portion of the tip plunger,
• wherein the locking sleeve is configured to inhibit release of a tip plunger from the stroke rod, and
• wherein the locking sleeve is configured to be displaced upward out of the locked position so that one of:
• (1) the stroke rod;
• and (2) the upper end of the tip plunger is at least partially released and the tip plunger is configured to be detached from the stroke rod.