Apparatus and methods for controlling mixtures of blood and cardioplegia
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United States of America Patent
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Oct 25, 1994
Grant Date -
N/A
app pub date -
Jun 3, 1993
filing date -
Jun 3, 1993
priority date (Note) -
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Abstract
Methods and apparatus are disclosed for variably controlling the ratio of blood to cardioplegia solution to be administered to a patient. A presently preferred embodiment of the apparatus of the invention comprises a multilumen tubing member having a blood supply lumen and three cardioplegia supply lumens, each having approximately the same tubing wall thickness, but having different inside diameters so that causing flow through different combinations of the cardioplegia lumens will result in different ratios of blood to cardioplegia. The four tubes comprising the multilumen tubing member are advantageously connected by web members, thereby facilitating use with a roller pump and minimizing the tangle of tubes.
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