| 摘要 |
Apparatus for metering and dispensing fluid includes a fluid dispensing section having an exit orifice, a fluid inlet, and a pathway extending from the fluid inlet to the exit orifice. A portion of the pathway includes a hydrophilic portion for metering a volume of the fluid when the dispensing section is upright; and a hydrophobic ring at the fluid inlet for preventing a metered volume from flowing out of the hydrophilic portion when the dispensing section is upright. The apparatus further includes a one-way valve between the exit orifice and the hydrophilic portion for allowing fluid to flow out of the hydrophilic portion and toward the exit orifice when sufficient pressure is applied to the fluid inlet. The one-way valve also prevents fluid from flowing through the exit orifice when the hydrophilic portion is being filled with fluid. |
