Patent ID: 7641794
Filing Date: 2010-01-05
Classification: A61M

Abstract:
1. A blood processing filter comprising a flexible container, which has a blood inlet port and a blood outlet port, and a sheet-like filter element for removing undesirable components from blood, wherein, the blood inlet port is separated from the outlet port by the filter element, a first seal zone is formed by integrating a section near a periphery of the sheet-like filter element with the flexible container over an entire circumference of the flexible container, a second seal zone is formed by integrating a blood inlet port side section of the flexible container with a blood outlet port side section of the flexible container over an entire outside circumference of the first seal zone, an unsealed zone disposed between the first seal zone and the second seal zone, and a cross-section of the first seal zone comprises at least five layers from the blood inlet port side to the blood outlet port side, said five layers consist of a layer consisting only of a blood inlet port side flexible container material, a blood inlet port side composite material layer wherein the blood inlet port side flexible container material is mixed with a filter element material, a molten container material invading fiber voids of the filter element and the fibers being embedded by the material of the container, a layer consisting only of molten filter element material, a blood outlet port side composite material layer wherein a blood outlet port side flexible container material is mixed with the filter element material, the molten container material invading the fiber voids of the filter element and the fibers being embedded by the material of the container, and a layer consisting only of a blood outlet port side flexible container material, wherein both the blood inlet port side composite material layer and the blood outlet port side composite material layer have a thickness between 0.15 mm and 0.4 mm.