Manual flow regulation for blood collection

A specimen collection assembly comprising:

• a cannula, defining a lumen therein;
• a hub at least partially supporting the cannula and defining a collection channel therein, the collection channel adapted for fluid communication with an interior of an evacuated collection container;
• and
• flow control means fixedly configured with respect to the lumen, the flow control means being rotatable to alter a flow path between the lumen of the cannula and the collection channel of the hub, wherein the flow control means comprises manually varying a length or a cross-sectional area of the flow path between a maximum flow position and a minimum flow position.

A specimen collection assembly comprising:

• a cannula, defining a lumen therein;
• a hub at least partially supporting the cannula and defining a collection channel therein;
• a spine member engaged with the hub and with a tube holder, wherein the tube holder is configured to contain a specimen collection tube;
• and
• a flow control member defining a regulation channel in fluid communication with the lumen of the cannula and engaging with the spine member so that the flow control member is rotatable relative to the spine member, wherein the flow control member is configured to adjustably alter an effective flow distance between the lumen of the cannula, a flow aperture within the spine member, and the collection channel within the hub.