Patent ID: 8328770

Claim:
A blood transfusion device comprising: a drip chamber ( 10 ) comprising a bottom outlet ( 113 ); a filter ( 40 ) fixedly disposed in the drip chamber ( 10 ); and a float regulator ( 20 ) moveably disposed in the drip chamber ( 10 ) under the filter ( 40 ), the float regulator ( 20 ) comprising an inverted upper cup ( 21 ) including a top projection ( 212 ), a lower cup ( 22 ) secured to the upper cup ( 21 ), and a suction cup ( 23 ) secured to an underside of the lower cup ( 22 ); wherein an inner diameter of the upper cup ( 21 ) is greater than an outer diameter of the lower cup ( 22 ); wherein the projection ( 212 ) is configured to contact an underside of the filter ( 40 ) when blood from a blood bag ( 90 ) sufficiently fills the drip chamber ( 10 ); and wherein the suction cup ( 23 ) is configured to fall to permanently close the outlet ( 113 ) when blood in the drip chamber ( 10 ) completely drains.