Blood filter

Details Blood filter Blood filter

A - Human Necessities

61

M

183/14

A61M 1/36 (2006.01) A61M 1/32 (2006.01)

Patent

CA 1236408

ABSTRACT OF THE DlSCLOSURE A blood fllter such as may be used ln a cardlopulmonary bypass system lncludes a houslng havlng upper and lower chambers wlth a cyllndrlcal fllter element dlsposed ln the lower chamber. The lnlet to the houslng ls ln the upper chamber, whlch ls upstream of the lower chamber, and the outlet ls through the lower chamber and communlcates wlth the lnterlor of the fllter element. Thus, blood enters the upper chamber and flows to the lower chamber where lt passes through the fllter element from the outer slde to the lnterlor to remove mlcroemboll such as gas bub- bles, fat emboll and agglomerates, the flltered blood exltlng through the outlet. ln order to remove a substantlal amount of the gas ln the blood, and partlcularly gross bubbles, upstream of the fllter element, the upper chamber ls cyllndrlcal and the lnlet dlrects the blood tangentlally to flow around the perlphery of the chamber. An annular baffle extendlng around a maJor por- tlon of the chamber malntalns the perlpheral flow whlch produces a centrlfugal actlon causlng the blood to flow at the wall of the chamber and the gas to separate and move to the central portlon where lt ls vented through a hydrophoblc membrane coverlng the central portlon of the top wall of the chamber. Blood from the perlphery of the upper chamber flows down to the lower chamber through a sponge rlng whlch removes addltlonal gas bubbles by causlng the latter to coalesce lnto larger bubbles whlch move radlally lnwardly of the rlng and rlse to the upper chamber where they also are vented through the membrane. Any gas bubbles whlch remaln ln the blood and whlch are larger than the acceptable slze are blocked by the fllter element. The bubbles at the fllter element eventually coalesce lnto larger bubbles whlch break away from the fllter element and rlse to the upper chamber where they are vented through the membrane.

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