Valve shaft pump with coordinated pumping and valving operations

A pump device for fluid delivery comprising:

• a housing,
• a pump having a variable volume fluid chamber disposed within the housing and configured with a first end of the pump that can be translated relative to a second end of the pump to vary a length of the fluid chamber along a longitudinal axis of the housing during pumping motion;
• a fluid intake port that is in fluid communication with a fluid supply for the fluid chamber;
• a fluid discharge port that is in fluid communication with a fluid path that receives fluid from the fluid chamber and directs the fluid to a fluid output;
• a valve assembly movable relative to the fluid intake port and the fluid discharge port, the valve assembly comprising at least one valve shaft comprising a first throughway and a second throughway;
• the housing having an opening from the fluid chamber to the valve assembly, and the valve assembly configured for valving motion comprising being controllably translated and disposed between the opening and the fluid intake port to provide fluid communication therebetween via the first throughway for fluid intake into the fluid chamber, and between the opening and the fluid discharge port to provide fluid communication therebetween via the second throughway for fluid discharge from the fluid chamber;
• wherein the translation of the first end of the pump and the translation of the valve assembly are controlled to coordinate the valving motion of the valve assembly with the pumping motion of the pump;
• and
• the housing and the pump have a first interlock mechanism that employs cam action to translate the first end of the pump relative to the second end when rotated by a drive mechanism;
• and the valve assembly has a second interlock mechanism that employs cam action to translate the valve assembly with respect to rotation of the drive mechanism.