Device for dispensing liquid drops

Abstract

A device for dispensing liquids in drop form is provided, including a dropper tip, a liquophilic membrane positioned within the dropper tip to substantially prevent contaminants from entering the dropper tip, and a liquophobic membrane positioned within the dropper tip, wherein the liquophobic membrane is substantially impervious to liquid and is generally pervious to air. The dropper tip defines an entry channel, a first passage defining a liquid outlet flow path for fluid to exit the dropper tip, and a second passage defining an air inlet flow path for fluid to enter the dropper tip. The liquophilic membrane is positioned between the entry channel and the first passage to substantially prevent contaminants from entering the entry channel via the first passage, and the liquophobic membrane is positioned between the entry channel and the second passage.

Dependencies are inferred from the claim text.