Blood processing filter
AssigneeAsahi Kasei Medical Co., Ltd.
InventorsShin-ichiroh Oka, Yoshimasa Matsuura, Tomohisa Yokomizo
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Abstract
A flexible blood filter allowing smooth flow of a liquid and being excellent in separation resistance, pressure resistance and centrifugation resistance. The blood processing filter, comprising a first filter element for removing aggregates from blood, a second filter element for removing leukocytes provided in the downstream of the first filter element, and the third filter element having gas permeability of 3 to 40 cc/cm2/sec per thickness of 1 cm provided between the second filter element and the outlet port side container.
Claims14
A blood processing filter for removing undesirable components from blood, comprising;
- a flexible container, which has a blood inlet port and a blood outlet port;
- and
- a sheet-like filter element inside the flexible container for removing undesirable components from blood passing through the container, wherein the blood inlet port is separated from the blood outlet port by the sheet-like filter element,
- the sheet-like filter element comprising,
- a first filter element for removing aggregate from blood,
- a second filter element downstream of the first filter element to remove leukocytes, and
- a third filter element downstream of the second filter element adjacent to the blood outlet port and that allows passage of blood constituents,
- wherein said third filter element has having a Gas permeability per 1 cm thickness of 3-40 cc/cm2/sec and a thickness of 0.04-0.25 cm, and wherein said third filter element has a Gas permeability per 1 cm thickness which increases away from said second filter element towards said blood outlet port.
A method of filtering blood or a blood preparation, comprising:
- allowing the blood or blood preparation to pass through a filter by action of gravity, wherein the filter includes a flexible container that has a blood inlet port and a blood outlet port, and a sheet-like filter element inside the flexible container removing undesirable components from blood passing through the container, the blood inlet port being separated from the blood outlet port by the sheet-like filter element, the sheet-like filter element comprising a first filter element for removing aggregate from blood, a second filter element downstream of the first filter element to remove leukocytes, and a third filter element downstream of the second filter element adjacent to the blood outlet port and that allows passage of blood constituents, the third filter element having a Gas permeability per 1 cm thickness of 3-40 cc/cm2/sec and a thickness of 0.04-0.25 cm and having a Gas permeability per 1 cm thickness which increases away from said second filter element towards said blood outlet port;
- and
- creating a negative pressure at the blood outlet port of the filter.
Dependencies are inferred from the claim text.