Patent ID: 7096820
Filing Date: 2006-08-29
Classification: A01K

Abstract:
1. An apparatus for delivering a predetermined volume of liquid to a delivery site, which comprises: a body defining a liquid pressure chamber and a pneumatic pressure chamber, said chambers separated from one another by a flexible membrane member; at least one liquid channel in said body connecting said liquid pressure chamber to a delivery port to deliver liquid to said delivery site; a pair of valves associated with said liquid channel, one valve upstream of said liquid pressure chamber and one valve downstream of said liquid pressure chamber, at least said downstream valve being pneumatically operated; said flexible member exerting pressure on a liquid when said liquid pressure chamber is filled with said liquid and pneumatic pressure is exerted on said flexible member through said pneumatic pressure chamber; and a prescribed volume of liquid being delivered through said channel to and out of said delivery port when said a downstream valve is opened.