Patent ID: 8821134

Claim:
A pump comprising: a pump body having a substantially cylindrical shape defining a cavity for containing a fluid, the cavity being formed by a side wall closed at one end by an end wall and partially closed at the other end by a driven end wall having a central portion and a peripheral portion extending radially outwardly from the central portion of the driven end wall; an actuator operatively associated with the central portion of the driven end wall to cause an oscillatory motion of the driven end wall, thereby generating displacement oscillations of the driven end wall in a direction substantially perpendicular thereto with an annular node between the centre of the driven end wall and the side wall when in use; an isolator being generally ring-shaped having an outside circumference fixed to the side wall and an inside circumference flexibly connected to the peripheral portion of the driven end wall to reduce dampening of the displacement oscillations, the isolator and driven end wall closing the other end of the side wall; a first aperture disposed at any location in the cavity other than at the location of the annular node and extending through the pump body; a second aperture disposed at any location in the pump body other than the location of said first aperture and extending through the pump body; and, a valve disposed in at least one of said first aperture and second aperture; whereby the displacement oscillations generate corresponding radial pressure oscillations of the fluid within the cavity of said pump body causing fluid flow through said first and second apertures when in use.