Multilayer test device having fusion bonding attachment layer
AssigneeEnvironmental Test Systems, Inc.
InventorsKenneth A. Blake, James E. Christner, Leonard J. Lucchese, II
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Abstract
A unitized multilayer dry reagent analytical chemistry test structure and device and method of fabricating such device is described. The device includes two or more contiguous layers of absorbent or porous paper or polymeric material, at least one of which is incorporated with a test reagent composition, the layers attached to each other with intermediate porous attachment layers by fusion bonding. When the device is contacted with the fluid being tested the attachment layers allow the free flow of such fluid from one layer to the next.
Claims15
A method of fabricating a multilayer test device for the determination of analytes in test fluids, the method comprising:
- A. incorporating a reagent composition into at least a portion of one of two or more porous matrix layers to form a test reaction area in the matrix layer incorporating the test reagent composition;
- B. placing an attachment layer consisting of a preformed fibrous sheet material of a fusible thermoplastic polymer having sufficient porosity to permit the flow of fluid therethrough between each adjacent matrix layer;
- and,
- C. laminating the matrix layers and attachment layers together whereby the attachment layers form a continuous interface area between said matrix layers so that said matrix layers are laminated or fusion bonded evenly and continuously to each other across the entire attachment surface area except in those areas defined by the pores of the attachment layer.
A multilayer dry reagent test device for the determination of analytes in test fluids comprising:
- A. at least two layers of porous matrix material in contiguous relationship, at least one of which is incorporated with a test reagent composition to form a test reaction area, and
- B. a preformed fibrous attachment layer of a fusible thermoplastic material located between adjacent matrix layers and having sufficient porosity to permit the free flow of test fluid between adjacent matrix layers, wherein said attachment layer forms a continuous interface area between said matrix layers so that said matrix layers are laminated or fusion bonded evenly and continuously to each other across the entire attachment surface area except in those areas defined by the pores of the attachment layer.
Dependencies are inferred from the claim text.