Patent ID: 7320259

Claim:
A pipette tip comprising: a tapered sidewall having a proximal end, a distal end and a tapered sidewall length extending from said proximal end to said distal end, said tapered sidewall having an arcuate inner surface extending along said tapered sidewall length, said arcuate inner surface defining a volume with an axis, said axis extending from said proximal end to said distal end, said tapered sidewall having an upper portion for receiving a shaft of a pipette tool, said upper portion comprising: a wall member having a wall member length, a wall member channel surface, an outer wall member surface, and a top surface joining said wall member channel surface and said outer wall member surface; and a sealing member having a sealing member length, a sealing member channel surface, and a sealing member inner surface that is coextensive with at least a portion of said arcuate inner surface, said sealing member channel surface spaced radially towards said axis from said wall member channel surface to define an arcuate channel therein between, said arcuate channel extending from said top surface of said wall member toward said distal end, said sealing member being deflectable from a first position to a second position in the direction of said arcuate channel when receiving said shaft of said pipette tool, said sealing member being elastically deformable to frictionally effect a seal around said shaft of said pipette tool; and a stop means for limiting the travel of said shaft of said pipette tool toward said distal end, said stop means being positioned in said upper portion.