Patent ID: 8702405
Filing Date: 2014-04-22
Classification: F04B

Abstract:
1. A twisting translational displacement pump cartridge comprising: a) a polymer shell containing a large cavity located between two smaller cavities along a longitudinal axis of said polymer shell, and wherein perpendicular passages intersect said smaller cavities along said longitudinal axis; b) moveable cores closely fit inside said polymer shell; c) interior sulci in said polymer shell located within close proximity and adjacent to each side of said perpendicular passages along said longitudinal axis; d) a standard taper surrounding an outer perimeter of said perpendicular passages to connect nozzles suitably designed to mate with said standard taper; e) a gear or pulley at least partially surrounding said polymer shell concentric to the longitudinal axis; and f) a bearing surface surrounding an outer perimeter of said polymer shell to support rotation of said polymer shell wherein said moveable cores rotate clockwise or counterclockwise while translating along the longitudinal axis to increase or reduce a volume of the large cavity, thereby reducing the propensity for stick slippage or sticking of said movable cores against interior surfaces of the polymer shell used for sealing against the cores.