Dermal substance collection method
First Claim
1. A method for the non-invasive, immediate and continuous collection of a chemical substance from a dermal surface, said method comprising the steps ofI. applying to the skin to collect said chemical substance from said surface a dermal surface a dermal substance collection device (DSCD) comprised of:
- (a) a binding reservoir material for binding with said dermal substance to prevent back transfer loss of said dermal substance from said collection device to the dermal surfaces;
(b) a liquid bridge transfer medium which allows the instantaneous and continuous transfer of said dermal substance from the dermal surface to said binding reservoir material, said binding reservoir material being maintained in a wet-state by said liquid bridge transfer medium; and
(c) a cover means for occlusively containing said binding reservoir material and said liquid bridge transfer medium and for occlusively maintaining said liquid bridge transfer medium in continuous contact with the dermal surface upon application of said collection device to the dermal surface;
II. maintaining the DSCD in a substantially air tight relation with the skin surface over the collection period;
III. removing the binding reservoir material from the DSCD; and
IV. analyzing the chemical substance collected in the binding reservoir.
1 Assignment
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Accused Products
Abstract
A dermal substance collection device (DSCD) is described which provides ms for the non-invasive, instantaneous and continuous monitoring of chemical substances which are present in a detectable amount in either or both interstitial fluid or sweat or which are on or in the skin. The transdermal substance collection device of this invention is comprised of three essential components: (1) a substance binding reservoir, wettable by (2) a liquid transfer medium which allows for liquid bridge transfer of a soluble substance from the skin surface to the binding reservoir by virtue of its wettability by the liquid, and (3) an occlusive cover.
17 Citations
20 Claims
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1. A method for the non-invasive, immediate and continuous collection of a chemical substance from a dermal surface, said method comprising the steps of
I. applying to the skin to collect said chemical substance from said surface a dermal surface a dermal substance collection device (DSCD) comprised of: -
(a) a binding reservoir material for binding with said dermal substance to prevent back transfer loss of said dermal substance from said collection device to the dermal surfaces; (b) a liquid bridge transfer medium which allows the instantaneous and continuous transfer of said dermal substance from the dermal surface to said binding reservoir material, said binding reservoir material being maintained in a wet-state by said liquid bridge transfer medium; and (c) a cover means for occlusively containing said binding reservoir material and said liquid bridge transfer medium and for occlusively maintaining said liquid bridge transfer medium in continuous contact with the dermal surface upon application of said collection device to the dermal surface; II. maintaining the DSCD in a substantially air tight relation with the skin surface over the collection period; III. removing the binding reservoir material from the DSCD; and IV. analyzing the chemical substance collected in the binding reservoir. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification