| 摘要 |
Provided is a pipette, including: a cylinder (1) having a distal end portion (1a) to which a pipette tip (3) is removably fitted; and a piston (7) fitted to be freely advanced and retreated in a cylinder chamber (6), the piston (7) being retreated to suck liquid and advanced to eject the liquid thus sucked. The piston (7) includes, on an outer periphery thereof, a communication groove (17) for communicating an inside of the cylinder chamber (6) and an outside of the cylinder chamber (6) to each other when the piston (7) is advanced by an amount corresponding to a dimension larger than a predetermined dimension, the communication groove (17) being located on the outside of the cylinder chamber (6) when the piston (7) is located at a retreated position. When the piston (7) is advanced by the amount corresponding to the dimension larger than the predetermined dimension, seal between the cylinder chamber (6) and the piston (7) is released, with the result that pressure in the cylinder chamber (6) becomes equal to the atmospheric pressure, and a suction/ejection effect is eliminated. |
