Pipette tip with an internal sleeve and method for forming same

A method of forming a tubular pipette tip member having a sidewall with a bifurcated section that comprises a base wall portion and second and third sidewall portions branching therefrom and extending substantially axially from the first sidewall portion in the proximal direction, comprising the steps of:

• providing a mold including a mold core, the mold core extending from a proximal end to a distal end and having an exterior wall with a conical shape, the mold core having a section including a mold finger portion that branches laterally outward from the exterior wall and extends substantially axially in the distal direction and is spaced from a portion of the exterior wall to define a mold recess therebetween,
• introducing mold material into the mold wherein the mold material flows into the mold recess to form the third sidewall portion of the tip member and the mold material flows around the finger portion to form the second sidewall portion of the tip member;
• and
• removing the mold material by forcing the mold material off of the mold core in the distal direction.