CONTAMINATION-RESISTANT DISPENSING AND METERING DEVICE

摘要

A device for dispensing liquid drops, such as drops of medicine, in a controlled fashion while protecting the rest of the liquid from inadvertent contamination is provided by an elastically deformable container with a composite membrane across a passageway between the body of the container and a delivery orifice. The composite membrane has one component that is liquophilic and one that is liquophobic, both components having pore sizes to resist the passage of contaminant.