Method and apparatus for determination of chemical species in body fluid
First Claim
1. A dermal concentration patch for determining the presence of a photosensitive analyte in a subject mammal'"'"'s perspiration, comprising:
- a concentration layer having a first side and a second side;
an attenuation layer disposed over the second side of the concentration layer for attenuating the amount of light reaching the concentration layer; and
an adhesive membrane on at least one of the concentration layer or attenuation layer for securing the first side of the concentration layer in fluid communication with the subject'"'"'s skin,wherein water vapor is permitted to escape through the concentration layer and the attenuation layer and outside of the concentration patch.
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Accused Products
Abstract
Disclosed is a method and apparatus for the non-invasive determination of one or more preselected analytes in a body fluid expressed through the skin. The fluid is collected in a dermal concentration patch and concentrated by driving off a portion of the substantial water fraction under the influence of body heat. The analyte is optimally complexed with an immobilized specific binding partner and an indicium of the presence of the analyte is visually expressed. The patch may comprise a plurality of test zones for screening for a plurality of analytes. Additional positive and negative control zones are also disclosed. The patch may comprise a feature to detect tampering with the patch to produce false negative results, especially when used in screens for drugs of abuse. In addition to being useful as a drug of abuse screen, the patch is useful for diagnostic purposes.
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Citations
18 Claims
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1. A dermal concentration patch for determining the presence of a photosensitive analyte in a subject mammal'"'"'s perspiration, comprising:
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a concentration layer having a first side and a second side; an attenuation layer disposed over the second side of the concentration layer for attenuating the amount of light reaching the concentration layer; and an adhesive membrane on at least one of the concentration layer or attenuation layer for securing the first side of the concentration layer in fluid communication with the subject'"'"'s skin, wherein water vapor is permitted to escape through the concentration layer and the attenuation layer and outside of the concentration patch. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A dermal concentration patch for determining the presence of a photosensitive analyte in a subject mammal'"'"'s perspiration, comprising:
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a water permeable support layer having a first side and a second side; and a vapor permeable attenuation layer on the second side of the support layer for attenuating the amount of light reaching the support layer, the attenuation layer having an adhesive thereon for securing the first side of the support layer in fluid communication with the subject'"'"'s skin, wherein water is permitted to escape through the support layer and outside of the concentration patch.
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11. A dermal concentration patch for determining the presence of a photosensitive analyte in a subject mammal'"'"'s perspiration, comprising:
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a concentration zone for collecting and storing said photosensitive analyte, wherein said concentration zone has a first side and a second side, wherein said first side is capable of being placed in fluid communication with the subject'"'"'s skin; an adhesive layer having a first side and a second side, wherein said first side is proximate to said second side of said concentration zone, for removably securing the first side of said concentration zone in fluid communication with the subject'"'"'s skin; and an attenuation layer having a first side and a second side, wherein said first side is proximate to said second side of said adhesive layer, for attenuating the transmission of light into said concentration zone, wherein the concentration zone and the attenuation layer allow passage of aqueous components of sweat to outside of the concentration patch.
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12. A method of determining the presence of a photosensitive analyte in perspiration of a subject mammal, comprising the steps of:
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securing a dermal patch having a concentration zone to the subject'"'"'s skin, wherein said concentration zone is in fluid communication with the subject'"'"'s skin; collecting perspiration containing said photosensitive analyte from said subject'"'"'s skin in said concentration zone; attenuating the amount of photoradiation reaching said concentration zone during said collecting step, thereby protecting said photosensitive analyte from excessive photoradiation exposure; concentrating said photosensitive analyte in said concentration zone by allowing aqueous components of perspiration to pass through and escape from said dermal patch; and determining the presence of said photosensitive analyte in said subject'"'"'s perspiration. - View Dependent Claims (13, 14, 15, 16, 17, 18)
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Specification