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Spiral wound extraction cartridge

United States Patent

5,897,779
April 27, 1999
View the Complete Patent at the US Patent & Trademark Office
A cartridge device for removing an analyte from a fluid comprises a hollow core, a sheet composite comprising a particulate-loaded porous membrane and optionally at least one reinforcing spacer sheet, the particulate being capable of binding the analyte, the sheet composite being formed into a spiral configuration about the core, wherein the sheet composite is wound around itself and wherein the windings of sheet composite are of sufficient tightness so that adjacent layers are essentially free of spaces therebetween, two end caps which are disposed over the core and the lateral ends of the spirally wound sheet composite, and means for securing the end caps to the core, the end caps also being secured to the lateral ends of the spirally wound sheet composite. A method for removing an analyte from a fluid comprises the steps of providing a spirally wound element of the invention and passing the fluid containing the analyte through the element essentially normal to a surface of the sheet composite so as to bind the analyte to the particulate of the particulate-loaded porous membrane, the method optionally including the step of eluting the bound analyte from the sheet composite.
Wisted; Eric E. (Apple Valley, MN), Lundquist; Susan H. (White Bear Township, MN)
Minnesota Mining and Manufacturing Company (St. Paul, MN)
08/ 791,205
February 13, 1997
The U.S. Government has certain rights in this invention under Department of Energy Contract No. DE-AR21-96MC33089.