Perpetual by-pass flushing device

Claim 1

An animal or human infusion flushing device comprising a body having at least a primary passage therethrough, an intermediate portion of said passage being divided into a restricted channel and a flushing channel spaced from each other, liquid directing means comprising valve means movably mounted in said body and movable transversely to said liquid flow through said liquid passage, a pair of sealing means on said valve means defining a space between said sealing means, biasing means for biasing said directing means toward a normal resting position in which said restricted channel is open and said flushing channel is closed, said device being sized to be held in one hand and an extension at one end of said directing means extending outside of said body for exposure to a finger of said holding hand to move said directing means against said biasing means from said resting position to said flushing position in which said flushing channel is open and said restricted channel is closed, said primary liquid passage always communicating with said space, said restricted and flushing channels communicating with said space only when said directing means is in said resting and said flushing position respectively, said body has a secondary liquid passage therethrough generally parallel to said primary passage but independent of said liquid directing means, said secondary passage communicates with said primary passage downstream of said channels.