Patent ID: 8337700
Filing Date: 2012-12-25
Classification: A61M

Abstract:
1. A biological fluid filtration device comprising: a housing having an inlet, a first outlet, and a second outlet, and defining a first fluid flow path between the inlet and the first outlet, and a second fluid flow path between the inlet and the second outlet, wherein the housing essentially lacks a solid partition wall between the first fluid flow path and the second fluid flow path, a first biological fluid filtration media, having an upstream surface and a downstream surface, interposed between the inlet and the first outlet and across the first fluid flow path, wherein the first biological fluid filtration media comprises at least a first filter element comprising at least one layer of porous filter material of a first pore size, and a second filter element comprising at least one layer of porous filter material of a second pore size smaller than the first pore size, and wherein the first filter element is upstream of the second filter element, a second biological fluid filtration media, having an upstream surface and a downstream surface, interposed between the inlet and the second outlet and across the second fluid flow path, wherein the second biological fluid filtration media comprises at least a first filter element comprising at least one layer of porous filter material of a first pore size, and a second filter element comprising at least one layer of porous filter material of a second pore size smaller than the first pore size, and wherein the first filter element is upstream of the second filter element, an upstream chamber including a space between the first biological fluid filtration media and the second biological fluid filtration media, with the upstream surface of the first biological fluid filtration media opposing the upstream surface of the second biological fluid filtration media with all of the fluid that flows through the first fluid flow path flowing from the inlet, through the first biological fluid filtration media, and out of the first outlet, so that all of the fluid that flows through the first fluid flow path and exits the first outlet is filtered only by the first biological fluid filtration media, and with all of the fluid that flows through the second fluid flow path flowing from the inlet, through the second biological fluid filtration media, and out of the second outlet, so that all of the fluid that flows through the second fluid flow path and exits the second outlet is filtered only by the second biological fluid filtration media, with the amount of fluid flowing through the first fluid flow path and the second fluid flow path being essentially equal, with the fluid flowing through the first fluid flow path being filtered simultaneously with the fluid flowing through the second fluid flow path, so that all of the fluid that exits the first outlet can be collected in a first collection container, and so that all of the fluid that exits the second outlet can be collected in a second collection container.