Patent ID: 7434710

Claim:
A bellows pump comprising: a pump body having a base wall defined by a base wall perimeter; an inlet aperture in said base wall offset from said base wall perimeter; an outlet aperture in said base wall offset from said base wall perimeter; and a bellows member including: an open end defined by a sealing flange that is sealed to said base wall, with said inlet aperture and said outlet aperture being positioned within said open end, a first hinge, a sealing web extending inwardly from all points of said sealing flange to said first hinge, a bellows cap, and a dosing web extending outwardly from said first hinge at one end of said dosing web to said bellows cap at the other end of said dosing web, wherein said bellows cap provides a closed end opposite said open end, said sealing web, said dosing web and said bellows cap defining a dose volume between said base wall of said pump body and said bellows cap, wherein pressing on said bellows cap toward said base wall collapses said bellows member such that said sealing web covers said inlet aperture but does not cover said outlet aperture, thereby expelling at least a portion of the contents of said dose volume out said outlet aperture.