Unitary venous return reservoir with cardiotomy filter

Claim 1

A device (1) for the treatment and collection of blood from two different sources during a surgical procedure comprising a hollow housing (3) made of a rigid material and having a top wall (5), a side wall (9) and a bottom wall (7); a first blood treatment element (11) inside the housing (3) comprising in series a layer of porous defoaming material (87) and a layer of non-woven depth filter material (89); a second blood treatment element (13) inside the housing (3) comprising a layer of porous defoaming material (99), with said second blood treatment element (13) being free of any depth filter material; a reservoir (25) defined within said device for collecting treated blood; a gas vent (35) in the top wall (5) of the housing (3) in communication with said reservoir (25); a treated blood outlet (29) in the bottom wall (7) of the housing (3) at the bottom of said reservoir (25); first and second blood inlets (15, 23) in said housing (3); and means (55, 65, 79) within said housing (3) for providing a first blood flow path in the device through said first inlet (15), said first blood treatment element (11), said reservoir (25) and said treated blood outlet (29) and a second blood flow path in the device through said second inlet (23), said second blood treatment element (13), said reservoir (25) and said treated blood outlet (29), with said means (69) positively preventing blood in said second flow path from passing through said layer of non-woven depth filter material (89) in the first blood treatment element (11).

Claim 2

A device (1) for the treatment and collection of blood from two different sources during a surgical procedure comprising a hollow housing (3) made of a rigid material and having a top wall (5), a side wall (9) and a bottom wall (7); a first blood treatment element (11) inside the housing (3) comprising in series a layer of porous defoaming material (87) and a layer of non-woven depth filter material (89); a second blood treatment element (13) inside the housing (3) comprising a layer of porous defoaming material (99), with said second blood treatment element (13) being free of any depth filter material; a reservoir (25) defined within said device for collecting treated blood; a gas vent (35) in the top wall (5) of the housing (3) in communication with said reservoir (25); a treated blood outlet (29) in the bottom wall (7) of the housing (3) at the bottom of said reservoir (25); first and second blood inlets (15, 23) in said housing (3); and means (55, 65, 79) within said housing (3) for providing a first blood flow path in the device through said first inlet (15), said first blood treatment element (11), said reservoir (25) and said treated blood outlet (29) and a second blood flow path in the device through said second inlet (23), said second blood treatment element (13), said reservoir (25) and said treated blood outlet (29), with said means (69) positively preventing blood in said second flow path from passing through said layer of non-woven depth filter material (89) in the first blood treatment element (11).

Claim 7

A device (1) for the treatment and collection of blood from two different sources during a surgical procedure comprising a first vertically-extending annular blood treatment element (11) comprising in series an annular layer of porous defoaming material (87) and an annular layer of non-woven depth filter material (89); a second vertically-extending annular blood treatment element (13), located directly below said first element (11), comprising an annular layer of porous defoaming material (99), with said second blood treatment element (13) being free of any depth filter material; a hollow housing (3) made of a rigid material and having a top wall (5), a bottom wall (7) and a generally cylindrical side wall (9) spaced radially from said first and second blood treatment elements (11, 13); a reservoir (25) for collecting treated blood, at least a portion of which is defined by the outer peripheries of the first and second blood treatment elements (11, 13) and the adjacent side housing wall (9); a gas vent (35) in the top wall (5) of the housing (3) in communication with said reservoir (25); a treated blood outlet (29) in the bottom wall (7) of the housing (3) at the bottom of said reservoir (25); a first blood inlet (15) in said housing (3) in communication with the inner space within the first blood treatment element (11); a second blood inlet (23) in said housing (3) in communication with the inner space within the second blood treatment element (13); and an internal wall (69) within the device preventing liquid flow between the inner spaces within the first and second blood treatment elements (11, 13) and extending radially outwardly between said elements (11, 13) at least until the outer periphery of the layer of depth filter material (89) in the first element (11), whereby a first blood flow path is provided in the device through the first inlet (15), the first blood treatment element (11), the treated blood reservoir (25) and the treated blood outlet (29), and a second blood flow path is provided in the device through the second inlet (23), the second blood treatment element (13), the treated blood reservoir (25)and the treated blood outlet (29).

Claim 8

A device (1) for the treatment and collection of blood from two different sources during a surgical procedure comprising a first vertically-extending annular blood treatment element (11) comprising in series an annular layer of porous defoaming material (87) and an annular layer of non-woven depth filter material (89); a second vertically-extending annular blood treatment element (13), located directly below said first element (11), comprising an annular layer of porous defoaming material (99), with said second blood treatment element (13) being free of any depth filter material; a hollow housing (3) made of a rigid material and having a top wall (5), a bottom wall (7) and a generally cylindrical side wall (9) spaced radially from said first and second blood treatment elements (11, 13); a reservoir (25) for collecting treated blood, at least a portion of which is defined by the outer peripheries of the first and second blood treatment elements (11, 13) and the adjacent side housing wall (9); a gas vent (35) in the top wall (5) of the housing (3) in communication with said reservoir (25); a treated blood outlet (29) in the bottom wall (7) of the housing (3) at the bottom of said reservoir (25); a first blood inlet (15) in said housing (3) in communication with the inner space within the first blood treatment element (11); a second blood inlet (23) in said housing (3) in communication with the inner space within the second blood treatment element (13); and an internal wall (69) within the device preventing liquid flow between the inner spaces within the first and second blood treatment elements (11, 13) and extending radially outwardly between said elements (11, 13) at least until the outer periphery of the layer of depth filter material (89) in the first element (11), whereby a first blood flow path is provided in the device through the first inlet (15), the first blood treatment element (11), the treated blood reservoir (25) and the treated blood outlet (29), and a second blood flow path is provided in the device through the second inlet (23), the second blood treatment element (13), the treated blood reservoir (25)and the treated blood outlet (29).