Abstract: A fluid flow control system using flow rate changes to extract additional information from an in-line flow sensor. The system provides the ability to determine a position of a movable flow sensor element of a flow sensor by illuminating a photosensitive pixel array with a light source to create a first set of pixel intensity values introducing an abrupt change to the fluid driving pressure, illuminating the photosensitive pixel array with a light source to create a second set of pixel intensity values, and calculating the difference between the first and second sets of pixel intensity values as a function of pixel position.

Abstract: A fluid flow control system using flow rate changes to extract additional information from an in-line flow sensor. The system provides the ability to determine a position of a movable flow sensor element of a flow sensor by illuminating a photosensitive pixel array with a light source to create a first set of pixel intensity values, introducing an abrupt change to the fluid driving pressure, illuminating the photosensitive pixel array with a light source to create a second set of pixel intensity values, and calculating the difference between the first and second sets of pixel intensity values as a function of pixel position.

Abstract: A fluid flow control system using flow rates to extract additional information from an in-line flow sensor. The system provides the ability to determine a position of a movable flow sensor element of a flow sensor by illuminating a photosensitive pixel array with a light source to create a first set of pixel intensity values introducing an abrupt change to the fluid driving pressure, illuminating the photosensitive pixel array with a light source to create a second set of pixel intensity values, and calculating the difference between the first and second sets of pixel intensity values as a function of pixel position.

Abstract: An infusion pump and method are provided which combine flow rate measurements calibrated by accurate volume measurements over time.

Abstract: An infusion pump and method are provided which control flow rates with variable fluid pressure and variable series flow resistance.

Abstract: A method and apparatus are disclosed for using flow rate changes to extract additional information from an in-line flow sensor.

Abstract: A system and method for measuring fluid volume and changes in fluid volume over time, using a simple, low cost architecture is described.

Abstract: An infusion pump and method are provided which control flow rates with variable fluid pressure and variable series flow resistance.

Abstract: A method of position measurement by processing at least two phase displaced signals and by selecting one signal for position measurement at a given position point. Specifically, the two phase displaced signals are quadrature signals and the selected signal has a more linear waveform slope relative to time at a given position point than the non-selected signal.

Abstract: A cassette for controlling fluid flow from a source to a sink, for example, a patient. The cassette comprises a housing, and a passive inlet valve for hydraulically controlling pressurized fluid flow from the inlet valve to a central chamber, and an actuatable outlet valve. The central chamber provides a fluid pathway between the inlet and outlet valves. The cassette further comprises a piston assembly for exerting pressure in the central chamber. The piston assembly comprises a movable member, a covering for the moveable member; and a flexible interface between the member and the housing for providing near frictionless movement between the member and the housing.