Patent ID: 8071050

Claim:
An ergonomic pipette tip comprising: at least one upper portion which defines a central receiving cavity configured to receive a pipetter barrel, wherein the at least one upper portion includes a sealing surface which faces a center of the central receiving cavity and is configured to engage with a pipetter barrel that is inserted into the central receiving cavity; at least one mechanical stop extending inwardly from said sealing surface towards the center of the central receiving cavity, and including an upper face configured to limit downward penetration of a pipetter barrel that is inserted into the central receiving cavity; and at least one lower portion defining a pipette tip cavity configured to hold a fluid and which is in communication with the central receiving cavity of the at least one upper portion, wherein the at least one lower portion includes an apex end configured to receive the fluid, wherein the at least one upper portion is made from a first material and the at least one lower portion is made from a second material that is different from the first material, wherein said upper portion has an inside bottom edge portion including a bottom face and second surface, said bottom face disposed in a substantially perpendicular relation to a longitudinal axis of said upper portion, and said second surface disposed in a direction substantially parallel to said longitudinal axis, wherein said lower portion has an upper edge portion having a top face and an third surface, said top face joined with said bottom face and said third surface joined with said second surface to form a joint between said upper and lower portions.