Fluid dispenser with metered outflow - comprises collapsible reservoir container with valved outlet leading to metering chamber, and includes outer support

摘要

The dispenser includes a hollow support enclosing a collapsible reservoir or container. The container has a one-way valve at its outlet for directing flow through the valve into a metering chamber. The metering chamber has an outlet connected to another one-way valve which valve prevents any backflow of contaminants into the container after fluid is dispensed. As the fluid is dispensed, the container can be collapsed to ensure complete evacuation of the fluid.