Surgery – Means for introducing or removing material from body for... – Treating material introduced into or removed from body...
Patent
1990-06-07
1991-10-15
Yasko, John D.
Surgery
Means for introducing or removing material from body for...
Treating material introduced into or removed from body...
604 51, A61M 500
Patent
active
050570900
ABSTRACT:
A drip metering apparatus, as for parenteral liquid infusion, includes a coupling arrangement providing multiple passageways from a liquid supply connector to a drip chamber. The passageways lead from the supply connector to respective drop-forming outlets, with the outlets of the different passageways being dimensioned to form different drop sizes and disposed to introduce the respective drops into an upper region of the drip chamber. In a preferred embodiment, the passageways are coaxial with one another and with the drip chamber, with the outer passageway being bounded in part by a resiliently flexible, relatively large diameter outer tube and the inner passageway being bounded by a relatively rigid, relatively small diameter inner tube. The relative flow resistances through the two tubes are such that with a common inlet flow to the tubes and both tubes open, substantially the entire flow follows the outer tube so that the rate of small drop formation is negligible in comparison with the rate of large drop formation. Thus, selection between the two drop sizes may be made by pinching the outer tube shut against the inner tube (small drops) or leaving the outer tube open (large drops).
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