Blood Processing Systems And Methods That Employ An In-Line Flexible Leukofilter
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Abstract
Systems and methods separate pump the blood cells through an in-line leukofilter to a blood cell storage container. The leukofilter has a filtration medium enclosed within a flexile housing. The systems and methods can employ a fixture to restrain expansion of the flexible filter housing during operation of the pump.
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Citations
45 Claims
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1-8. -8. (canceled)
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9. A blood processing system comprising
a blood processing set including a source of blood cells, and a blood component collection flow channel coupled to the source of blood cells including a blood cell storage container and an in-line filter to remove leukocytes from the blood cells before entering the blood cell storage container, the in-line filter including a leukocyte removal filter medium and first and second flexible housings, wherein the flexible housings are comprised of DEHP-free plastic material, and a pump station adapted to be placed into communication with the blood component collection flow channel to pump blood into the blood cell storage container through the in-line filter.
- 13. In a method of filtering a liquid using a filter comprising a flexible housing having an inlet port and outlet port for the liquid and a sheet-like filter element for removing undesired components from the liquid, with the inlet port being separated from the outlet port by the filter element, a method characterized by maintaining the pressure at the outlet side of the filter at a positive pressure above atmospheric pressure by controlling a feed rate per unit time of a feed pump installed in an upstream flow channel of the filter.
- 22. In a filtering system for a liquid comprising a filter comprising a flexible housing having an inlet port and outlet port for the liquid, a sheet-like filter element for removing undesired components from the liquid, with the liquid inlet port and the outlet port separated from each other by the filter element, an upstream side flow channel connected to the filter inlet port, a filtered liquid recovery bag, a downstream side flow channel connecting the filter outlet port with the recovery bag, and a feed pump installed in the upstream side flow channel, a filtering system wherein the feed rate per unit time of a feed pump installed in an upstream flow channel of the filter can be controlled so that the pressure at the outlet side of the filter is maintained at a positive pressure above atmospheric pressure.
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40. In a method of filtering blood or blood components using a filter comprising a flexible housing having an inlet port and outlet port, said inlet port being separated from the outlet port by a sheet-like filter element, said sheet-like filter element removing undesired elements from the blood, the method including:
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connecting the inlet port to a source of blood or blood components; connecting the outlet port to a container; pumping the blood from the source to the filter by a pump station communicating with a blood or blood component flow channel; adjusting at least one filtration parameter so that a pressure at an outlet side of the filter is above atmospheric pressure; maintaining a pressure at the outlet side of the filter above atmospheric pressure throughout filtration by adjusting said at least one filtration parameter; and collecting filtered blood or blood components in the container. - View Dependent Claims (41, 42, 43, 44, 45)
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Specification