Abstract: A method for synchronizing records stored at a first data storage location with records stored at a second, remote data storage location utilizes bitwise fingerprints and bitwise operations to determine records that exist in a first data set but not a second data set. A method for synchronizing records stored at a first data storage location with records stored at a second, remote data storage location utilizes bitwise fingerprints, and bitwise operations, and dynamic temporal segmentation to compare the timeliness of records in the first and second data sets.

Abstract: An ultrasonic sound generator and receiver are spaced apart from each other so as to receive a projecting portion of a cassette in which a liquid carrying passage is defined by a flexible membrane. The liquid carrying passage in the projecting portion fits between the ultrasonic sound generator and receiver, with opposite sides of the flexible membrane in contact with the sound generator and sound receiver. The sound generator and sound receiver each comprise a substrate having a layer of conducting material. Two electrically isolated regions are defined on the conductive layer, and a piezoelectric chip is electrically connected between the two regions. An electrical signal applied between the first and second regions excites the piezoelectric chip on the sound generator, causing it to generate an ultrasonic signal, which is transmitted through the liquid carrying passage.

Abstract: A disposable fluid infusion pumping chamber cassette comprises a sandwich type construction which lends itself to a multiplicity of control and monitoring functions including pressure monitoring, air bubble detection monitoring, adaption to multiple inputs, and leak detection monitoring, the cassette includes a rigid face member and a rigid back member having an elastomeric diaphragm positioned therebetween, provides for the transmission of fluid from one end of the cassette to the other, and includes an enlarged recess portion forming the pumping chamber, with exposed openings in the face member opposite the pumping chamber to permit the passage of a plunger and opposed openings adjacent the fluid passage to permit the selective actuation of valving members therein, with a flow control member mounted upon the face member adjacent the passage between the pumping chamber and fluid outlet thereof, which is utilized to either open the passage to free flow of fluid or to block it off completely.

Abstract: This invention relates to a disposable cassette having a pumping chamber therein and with a controlled positive displacing pump driving apparatus for use with the cassette, for performing intravenous or intra-arterial infusions. More particularly, it pertains to disposable cassettes which include an exposed flexible diaphragm forming one wall of the pump chamber and adapted to be engaged by a plunger or piston member driven and controlled by the driver apparatus to pump fluid through the cassette.

Abstract: An ultrasonic detector for detecting air in a fluid. A fluid pumping cassette includes an elastomeric member that defines three sides of a fluid passageway, a base of the cassette defining the other side. Resilient lobes on the elastomeric member extend outwardly in opposite directions on each side of the passageway, directly contacting an ultrasonic sound generator on one side and a piezoelectric sound receiver on the opposite side, the direct contact enhancing transmission of an ultrasound signal through the elastomeric member to facilitate detection of an air bubble in the fluid passage.

Abstract: A driver for use in an infusion pumping cassette having an elongated valve actuator which operates a valve controlling the flow of fluid through the cassette, a bracket having a first arm pivotally secured to one end of the valve actuator and a second arm, a cam driveably engaging the second arm, a motor which drives the cam and a positioner which monitors the rotational position of the cam.