Pipetting Device, Pipette Tip Coupler, and Pipette Tip: Devices and Methods

A pipette tip coupling device and pipette tip assembly comprising:

• a pipette tip comprising a circumscribing sidewall with an open interior passage including an interior surface extending along a central longitudinal axis of the pipette tip between an open proximal end and an open distal end of the pipette tip;
• a pipette tip coupling device comprising:
• a central body comprising:
• an elongated shank including a proximal end face;
• a distal stem portion having a first diameter;
• an end plate having a second diameter greater than the first diameter wherein the end plate is distal to the distal stem portion;
• and
• an open-ended interior circumscribing surface forming an open passageway extending longitudinally from the proximal end face through the end plate;
• an elastomeric element disposed around the distal stem portion and adjacent to the end plate;
• an expanding collet disposed around the central body, the expanding collet comprising:
• an annular base;
• a segmented collar comprising a plurality of circumferentially spaced apart arms, wherein each of the plurality of circumferentially spaced apart arms comprises:
• a lower arm portion attached to the annular base;
• an upper arm portion having an upper free segmented end;
• an outer surface;
• and
• an inner surface.