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US 4,170,056 AGranted
Blood filter
AssigneeBaxter Travenol Laboratories, Inc.
InventorsRichard P. Meyst, Ronald M. Porten
Life of this patent
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AssigneeBaxter Travenol Laboratories, Inc.
InventorsRichard P. Meyst, Ronald M. Porten
Estimating the term…
A filter for blood and the like including a housing defining an inlet for fluids to be filtered, and an outlet for filtered fluid, plus a stack of filter pads of thermoplastic fibers positioned within the housing. According to one aspect of this invention, the stack of pads is joined together at their periphery by a heat seal to form an integral filter unit, while, typically, the stack is joined to the housing at such periphery by a second seal. In another aspect of this invention, the fluid inlet is positioned adjacent a first pad of the stack and the fluid outlet is adjacent a last pad of the stack, the diameter of the fibers of the last pad being smaller than the diameter of the fibers of the first pad, typically with the fiber diameter of intermediate pads generally decreasing from pad to pad in the direction of the last pad.
The method of manufacturing a filter which comprises assembling a stack of filter pads comprising thermoplastic fibers, and including a first pad defining an upstream outer surface and a last pad defining a downstream outer surface, heat sealing the peripheries of said pads in the stack together to form an integral filter unit defining an integral periphery, and thereafter inserting and sealing said filter unit into a filter housing by forming a seal between said integral filter unit and the filter housing along said integral periphery.
The method of claimm 2 in which said heat sealing step is effected by sonic sealing.
In the method of preparing a fiber-containing filter pad for emplacement in a filter housing including applying binder material to both sides of said filter pad to cause the fibers to adhere together, and thereafter compressing said filter pad in a filter housing, the improvement comprising, in combination:
Dependencies are inferred from the claim text.