Patent ID: 8211054
Filing Date: 2012-07-03
Classification: A61M

Abstract:
1. A fluid control system for controlling administration of fluid from a medicament container, the system comprising: a primary fluid inlet configured to be coupled to a primary medicament container; a pump chamber in fluid communication with the primary fluid inlet, the pump chamber comprising a moveable wall and a pump outlet, the pump chamber configured for one-way fluid flow from the primary fluid inlet to the pump chamber and for one-way fluid flow from the pump chamber to the pump outlet, wherein fluid flows from the primary fluid inlet through the pump chamber to the pump outlet at a free flow rate when the pump wall is stopped; a pump driver coupled to the moveable wall of the pump chamber and configured to cyclically move the moveable wall between a first position and a second position at an adjustable rate in response to a pump signal; a flow restrictor movable between a fully open position and a closed position, the flow restrictor in fluid communication with the pump outlet, the flow restrictor comprising a restrictor outlet and configured to selectively increase and decrease fluid flow through the restrictor outlet, wherein fluid flows through the restrictor outlet at the free flow rate when the flow restrictor is in the fully open position; a restrictor driver connected to the flow restrictor and configured to move the flow restrictor device between the fully open position and the closed position in response to a restrictor signal; a flow detector comprising a fluid conduit disposed between the flow restrictor and the pump chamber, the flow detector configured to produce and detect a thermal change in fluid in the fluid conduit and to provide a detector signal representative of an existing fluid flow rate in the fluid conduit; a user input device configured to obtain a target flow rate from a user; and a controller in communication with the pump drive, the restrictor driver, and the flow detector, the controller configured to produce the pump signal and the restrictor signal to adjust the existing fluid flow rate to the target fluid flow rate and to automatically maintain the existing flow rate at the target fluid flow rate.