Flexible biological fluid filters
First Claim
1. A biological fluid filter assembly comprising:
- a flexible housing having first and second walls;
a filtration medium at least partially positioned between the first and second walls of the housing;
a substantially planar post-filter mesh at least partially positioned between the filtration medium and the second wall, the post-filter mesh comprising a semi-permeable layer with material present in a grid or web or crossed arrangement defining a plurality of voids without woven or overlapping strands or strips of material and having a normalized air permeability at a pressure difference of 125 Pa in the range of approximately 40 to approximately 800 cm2/s; and
a seal joining the first and second walls of the housing.
1 Assignment
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Accused Products
Abstract
Filter assemblies are processing biological fluid, such as blood or a blood component containing leukocytes. The filter assemblies include a flexible housing with first and second walls. A filtration medium and a support member are at least partially positioned between the walls of the housing, with a seal joining the walls of the housing, the filtration medium, and the support member. The filter assemblies may further include a pre-filter and/or a post-filter positioned between the walls of the housing. If provided, the pre- and post-filter may be positioned on opposite walls of the filtration medium, with the post-filter being a mesh positioned between the filtration medium and one of the walls of the housing or within an opening defined by the support member. A seal of the filter assembly may pass through the filtration medium, with the filtration medium being substantially omitted in a section of the seal.
440 Citations
23 Claims
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1. A biological fluid filter assembly comprising:
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a flexible housing having first and second walls; a filtration medium at least partially positioned between the first and second walls of the housing; a substantially planar post-filter mesh at least partially positioned between the filtration medium and the second wall, the post-filter mesh comprising a semi-permeable layer with material present in a grid or web or crossed arrangement defining a plurality of voids without woven or overlapping strands or strips of material and having a normalized air permeability at a pressure difference of 125 Pa in the range of approximately 40 to approximately 800 cm2/s; and a seal joining the first and second walls of the housing. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23)
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Specification