Patent ID: 8501118
Filing Date: 2013-08-06
Classification: B01L,Y10T

Abstract:
1. A disposable pipette tip for use with a pipetting system having a tip mounting shaft that includes a lower sealing section and an upper locking section having a stop, two or more outwardly extending lobes located above the stop and spaced circumferentially around the locking section of the mounting shaft, and recessed relief portions spanning circumferentially between the lobes and recessed relative to the lobes, each respective lobe having a catch surface that is spaced longitudinally above the stop on the mounting shaft by a predetermined distance, said disposable pipette tip comprising: a barrel having a lower opening through which liquid is aspirated into the barrel and dispensed from the barrel, an upper portion having an inside surface with a circular circumference and an upper end with a circular circumference and an inside diameter, said inside surface of the upper portion of the barrel including a circumferential sealing ring encircling the inside surface of the barrel and extending inward from the inside surface of the barrel; a collar having a continuous inner surface with a circular circumference in its relaxed state, an upper opening for receiving the tip mounting shaft, and a lower end with a circular circumference in its relaxed state and an inside diameter that is larger than the inside diameter of the upper end of the barrel; a circumferential shelf connecting the lower end of the collar to the upper end of the barrel, and means on the inner surface of the collar above the circumferential shelf for engaging the catch surfaces on the respective locking lobes after the collar has been distorted outwardly at the lobes and inwardly at the recessed relief portions when the disposable pipette tip is mounted on the tip mounting shaft with the circumferential shelf of the tip engaging the stop on the mounting shaft, said means for engaging being spaced above the circumferential shelf; wherein the collar of the disposable pipette tip is sufficiently flexible to distort outwardly at the lobes on the mounting shaft and inwardly at the recessed relief portions on the mounting shaft between the lobes when the pipette tip is mounted on the tip mounting shaft, and wherein the circumferential shelf has sufficient structural integrity to maintain roundness of the circular circumference of the upper portion of the barrel when the pipette tip is mounted on the tip mounting shaft.