A - Human Necessities – 61 – M
Patent
A - Human Necessities
61
M
128/90
A61M 5/14 (2006.01) A61M 5/36 (2006.01)
Patent
CA 1123698
ARRANGEMENT FOR INTRAVENOUS ADMINISTRATION OR THE LIKE ABSTRACT OF THE DISCLOSURE The arrangement comprises a passageway for receiving liquid for intra- venous administration (IV) or the like. A hydrophilic microporous mem- brane having a first pore size is disposed in the passageway at a first point so that all liquid passes through the microporous membrane at said first point. A microporous filter is disposed below the membrane in the passage- way to filter all liquid passing through the passageway at the second point. The membrane has a bubble point high enough to withstand the expected head of liquid below it (the gravity head of the IV set). Should liquid from the-source as it proceeds through the passageway from the microporous membrane to the filter be exhausted, then when air or gas reaches the mem- brane the flow of liquid is stopped because the upper, microporous mem- brane acts as an automatic shut-off valve. Air does not pass through the wet hydrophilic microporous membrane as long as the pressure does not exceed its bubble point. Accordingly there is no danger of air arriving at or passing through the microporous membrane to air-lock the lower passage way. A bellows drip chamber may be arranged in the passageway immediately below the membrane and may act as a drip chamber. A further embodiment comprises such a bellows drip chamber arranged in the passageway below and immediately adjacent the microporous mem- brane, and a branch in the passageway in the section between the drip chamber and the hydrophilic filter is used for the application of a secondary or auxiliary solution. In such a case, if the source of the secondary solu- tion is higher than the source of the primary solution, the secondary solu- tion will be preferentially administered. There will be no back-flow because air or gas in the bellows or drip chamber will act as an air lock and prevent the backward flow of liquid in the first passageway because air or gas can- not pass through the hydrophilic upper microporous membrane which is wet by the liquid above it.
309153
Millipore Corporation
Sim & Mcburney
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