posted on 2017-08-24, 17:57authored byAlexis F. Sauer-Budge, Samuel J. Brookfield, Ronald Janzen, Sarah McGray, Anna Boardman, Holger Wirz, Nira R. Pollock
Left: shuttle valve position one; airflow between capillary and atmosphere, allowing capillary to be filled. Middle: shuttle valve position two; airflow between piston chamber and capillary, allowing blood to be dispensed. Right: shuttle valve position three; airflow between atmosphere and piston chamber, allowing the chamber to be primed for another dispense.