Liquid permeable composition in dry reagent devices
First Claim
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1. A device for detection of an analyte in a liquid sample comprising:
- a liquid permeable layer for transferring portions of said liquid sample,two adjacent layers in contact with and adhering to said liquid permeable layer, at least one of said adjacent layers containing reagents for detecting said analyte,said liquid permeable layer comprising a blend of an aqueous polymer dispersion and a water soluble polymer applied as a coating on one of said two adjacent layers and dried at a temperature of about 40°
C. to 90°
C. to form a dried liquid permeable layer having a dried thickness of about 3 to 100 mils (75 to 2540 μ
m),said dried liquid permeable layer on one of said two adjacent layers having been pressed together with the second of said two adjacent layers with a pressure of about 3 to 100 psi sufficient to cause said two adjacent layers to adhere to said liquid permeable layer, andthe pressed liquid permeable layer and two adjacent layers having been further cured such that the pressed liquid permeable layer adheres to said two adjacent layers while retaining liquid permeability.
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Abstract
A device for detecting an analyte in a fluid sample includes a liquid permeable composition for making a physical separation between compositions of the sample or for reacting with components. The liquid permeable composition has adhesive properties and can be used to make a multi-layered test strip or the composition can be used in the sample wells of microfluidic devices.
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Citations
50 Claims
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1. A device for detection of an analyte in a liquid sample comprising:
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a liquid permeable layer for transferring portions of said liquid sample, two adjacent layers in contact with and adhering to said liquid permeable layer, at least one of said adjacent layers containing reagents for detecting said analyte, said liquid permeable layer comprising a blend of an aqueous polymer dispersion and a water soluble polymer applied as a coating on one of said two adjacent layers and dried at a temperature of about 40°
C. to 90°
C. to form a dried liquid permeable layer having a dried thickness of about 3 to 100 mils (75 to 2540 μ
m),said dried liquid permeable layer on one of said two adjacent layers having been pressed together with the second of said two adjacent layers with a pressure of about 3 to 100 psi sufficient to cause said two adjacent layers to adhere to said liquid permeable layer, and the pressed liquid permeable layer and two adjacent layers having been further cured such that the pressed liquid permeable layer adheres to said two adjacent layers while retaining liquid permeability. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A method of analyzing a liquid sample wherein said sample is contacted with dry reagents in at least one layer containing said reagents which react with analytes in said sample to provide a detectable response, said method characterized by including a liquid permeable layer in contact with and adhering to two adjacent layers, said liquid permeable layer comprising a blend of an aqueous polymer dispersion and a water soluble polymer for transferring portions of said liquid sample between said layers, said liquid permeable layer being applied as a liquid coating on one of said two adjacent layers and dried at a temperature of about 40°
- C. to 90°
C. to form said liquid permeable layer having a dry thickness of about 3 to 100 mils (75 to 2,540 μ
m), and then pressed together with the other of said two adjacent layers with a pressure of about 3 to 100 psi sufficient to cause said liquid permeable layer to adhere to said adjacent layers and then further dried in place between said two adjacent layers such that the liquid permeable layer adheres to both of said two adjacent layers while retaining liquid permeability. - View Dependent Claims (15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27)
- C. to 90°
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28. A multi-layer device for detection of an analyte in a fluid sample comprising:
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(a) a first layer for receiving said fluid sample; (b) a second layer for receiving at least a portion of said sample from said first layer; and (c) a liquid permeable adhesive layer disposed in contact with and adhering to said first and second layers, said liquid permeable adhesive layer being diffusible to fluids and comprising a blend of an aqueous polymer dispersion and a water soluble polymer which has been cast as a liquid coating on one of said first and second layers and dried at a temperature of about 40°
C. to 90°
C. to form said liquid permeable layer having a dry thickness of about 3 to 100 mils (75 to 2,540 μ
m), then pressed together with the other of said two adjacent layers and dried in place between said first and second layers with a pressure of about 3 to 100 psi sufficient to cause said first and second layers to adhere to said liquid permeable layer and at temperatures such that said adhesive layer adheres to said first and second layers while retaining liquid permeability, at least one of said combined layers of (a), (b), (c) containing reagents and being capable of detecting said analyte. - View Dependent Claims (29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50)
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Specification