Pipette tip with an internal sleeve and method for forming same

摘要

A pipette tip member having an elongated tubular receptacle having a sidewall with a bifurcated section that comprises first, second, and third sidewall portions. The first sidewall portion comprises a base wall and the second and third sidewall portions branch therefrom. The second sidewall portion comprises an outside branch wall, and the third sidewall portion comprises an inside branch wall spaced substantially parallel with and radially inward from the second sidewall portion. The inside branch wall is flexible in the radial direction and engages a pipette tip when it is inserted into the receptacle and to form a fluid-tight seal therewith. A method of forming a pipette tip member is also disclosed.