Importance

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Abstract

A cassette provides for a controlled introduction of fluid from a source to a patient. It includes a block and a chamber in the block. Separating means such as a diaphragm are movable in the chamber to define first and second compartments each having a variable volume in accordance with such movement. A transducer is movable with the separating means. The transducer may include a coil disposed on the block and a magnetic rod magnetically coupled to the coil and movable with the separating means to vary the inductance of the coil. Input and output lines are provided in the block. One of the lines in a first pair communicates with the input line and the first compartment and the other line in the first pair communicates with the second compartment and the output line. One of the lines in a second pair communicates with the input line and the second compartment and the other line in the second pair communicates with the first compartment and the output line. Control means provide alternately for a blocking of the second pair of lines and an opening of the first pair of lines and at other times for a blocking of the first pair of lines and an opening of the second pair of lines.

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First Claim