Abstract: A metering apparatus and system for controlling the administration of intravenous fluids (IV) having a flow passage within a housing connectable to a source of IV fluid and to a delivery tube terminating at an administration needle. In the metering apparatus, a metering pin is axially moveable within the passage and relative to a valve seat and defines a flow passageway and a variable area flow notch which are positionable relative to the valve seat to regulate flow from a purge to a flow blocking position. In the preferred embodiment, positioning of the metering pin is accomplished by a cam engaging a portion of the pin forming a cam follower. The cam is manually adjustable by a dial on the device to accomplish accurate, repeatable and continuous flow adjustment over the full range. The system incorporates the metering apparatus, a source of IV fluid, a drip chamber and administration means.

Abstract: A metering apparatus for controlling the administration of intravenous fluids (IV) having a flow passage within a housing connectable to a source of IV fluid and to a delivery tube terminating at an administration needle. The flow passageway incorporates a valve seat. A metering pin is axially moveable within the passage and relative to the valve seat. The metering pin defines a flow passageway and a variable area flow notch which are positionable relative to the valve seat to regulate flow from a purge to a flow blocking position. In the preferred embodiment, positioning of the metering pin is accomplished by a cam engaging a portion of the pin forming a cam follower. The cam is manually adjustable by a dial on the device to accomplish accurate, repeatable and continuous flow adjustment over the full range. In other embodiments, the pin may be adjusted relative to the valve seat by a rack and pinion arrangement and other mechanical equivalents.