Sterile solution delivery and venting devices

Claim 1

A squeeze bottle for storing and dispensing multiple doses of a sterile liquid comprising: a closed hollow body to contain said sterile liquid; said body having a neck portion; a normally closed deformable duck-bill valve mounted in said neck; an air inlet port in said neck; hydrophobic filter means mounted vertically behind said air inlet port; captive cap means movable between an open dispensing position and a closed position covering said duck-bill valve and preventing finger touching contamination thereof; co-operating means on said cap and the outside of said body to anchor said cap out of the flow of dispensed liquid when the cap is in open position; said normally closed duck-bill valve operating, when the cap is on open position, in response to pressure created by squeezing said bottle to dispense sterile liquid and automatically closing on release of squeezing pressure; said dispensing of sterile liquid creating a partial vacuum within said bottle; said vacuum in cooperation with the structure of the squeeze bottle serving the dual purpose of causing sterile liquid remaining in the duck-bill valve and the space in the neck directly below the valve to be drawn back into the body of said bottle and providing a differential pressure between the vacuum within the bottle and the higher atmospheric pressure outside the bottle, whereby the external pressure compresses the deformable duck-bill valve down against said neck thus forcing any remaining sterile liquid back into the body of the bottle; said hydrophobic filter means having a pore size which precludes passage of liquid and such that it sterilizes air passing into the bottle through the filter for equilibration of said vacuum; said hydrophobic filter means and said air inlet port being spaced below said cap to permit said equilibration to take place even when the cap is in closed position; the vertical disposition of said hydrophobic filter preventing occlusion of said filter by external liquid when the squeeze bottle is in use position; said cap when in closed position being tightly pressed against the external surface of the duck-bill valve thus preventing said valve from opening and discharging liquid no matter how the bottle is handled or squeezed when the cap is in closed position.