Reagent test strip
First Claim
1. A reagent test strip (10,10'"'"') comprising a support medium (12,12'"'"') including a handle portion (14,14'"'"') and a reagent support portion (16,16'"'"');
- an insoluble reagent (18,18'"'"') fixedly adhered to said reagent support portion (16,16'"'"') defining a reagent surface (19,19'"'"') capable of quantitatively changing reflectance in the presence of a reactant to be quantitatively determined; and
a cover (20,20'"'"') mounted on said support medium (12,12'"'"') and only over said reagent (18,18'"'"'), said cover (20,20'"'"') defining capillary chamber means (28,28'"'"') having two open ends (30,30'"'"') and a predetermined volume only over said reagent surface (19,19'"'"') for drawing a predetermined amount of liquid (32,32'"'"') into said capillary chamber means (28,28'"'"') and only over said reagent surface (19,19'"'"') to quantitatively react all of the liquid with said reagent (18,18'"'"') and quantitatively change the reflectance of the reagent surface, said cover (20,20'"'"') being the only structure over said reagent surface (19,19'"'"') and being spaced thereover only sufficiently to establish said predetermined volume for acting as a capillary.
1 Assignment
0 Petitions
Accused Products
Abstract
A reagent test strip (10,10'"'"') includes a support medium (12,12'"'"') having a handle portion (14,14'"'"') and a reagent support portion (16,16'"'"'). A reagent (18,18'"'"') is fixedly adhered to the reagent support portion (16,16'"'"'). A cover (20,20'"'"') is mounted on the support medium (12,12'"'"') and over the reagent (18,18'"'"'). The cover (20,20'"'"') defines a capillary chamber (28,28'"'"') having two open ends (30,30'"'"') and a predetermined volume only over the reagent surface (19) for drawing a predetermined amount of liquid (32,32'"'"') into the capillary chamber (28,28'"'"') to quantitatively react all of the liquid with the reagent (18,18'"'"'). The cover (20,20'"'"') is the only structure over the reagent surface (19,19'"'"') and is spaced thereover only sufficiently to establish the predetermined volume for acting as a capillary. Methods of using and manufacturing the reagent test strip (10,10'"'"') are also disclosed.
-
Citations
25 Claims
-
1. A reagent test strip (10,10'"'"') comprising a support medium (12,12'"'"') including a handle portion (14,14'"'"') and a reagent support portion (16,16'"'"');
- an insoluble reagent (18,18'"'"') fixedly adhered to said reagent support portion (16,16'"'"') defining a reagent surface (19,19'"'"') capable of quantitatively changing reflectance in the presence of a reactant to be quantitatively determined; and
a cover (20,20'"'"') mounted on said support medium (12,12'"'"') and only over said reagent (18,18'"'"'), said cover (20,20'"'"') defining capillary chamber means (28,28'"'"') having two open ends (30,30'"'"') and a predetermined volume only over said reagent surface (19,19'"'"') for drawing a predetermined amount of liquid (32,32'"'"') into said capillary chamber means (28,28'"'"') and only over said reagent surface (19,19'"'"') to quantitatively react all of the liquid with said reagent (18,18'"'"') and quantitatively change the reflectance of the reagent surface, said cover (20,20'"'"') being the only structure over said reagent surface (19,19'"'"') and being spaced thereover only sufficiently to establish said predetermined volume for acting as a capillary. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
- an insoluble reagent (18,18'"'"') fixedly adhered to said reagent support portion (16,16'"'"') defining a reagent surface (19,19'"'"') capable of quantitatively changing reflectance in the presence of a reactant to be quantitatively determined; and
-
17. A method of making a reagent test strip (10,10'"'"') including the steps of:
- cutting a predetermined length of a support medium (12);
embossing a first depression (50) at a predetermined distance proximate to one end (52) of the support medium (12) and a second depression (54) between the first depression and the end (52) of the support medium (12);
fixedly adhering an insoluble reagent (18) on the support medium (12) at a distance from the first depression (50) that is equal to the distance of the second depression (54) from the first depression (50) in the opposite direction;
folding over the support medium at the first depression (50) so that the second depression (50) forms a covered chamber (28) directly over the reagent (18) with two open sides; and
adhering the folded over portion to the support medium (12). - View Dependent Claims (18, 19, 20)
- cutting a predetermined length of a support medium (12);
-
21. A method of making a quantitative analytical determination of a soluble constituent in a liquid sample (32,32'"'"') comprising the steps of:
- contacting a lateral open aspect of a chamber (28,28'"'"') with a liquid (32,32'"'"') wherein the chamber (28,28'"'"') is defined between a reagent surface (19,19'"'"') of an insoluble reagent (18,18'"'"') fixedly deposited thereon and a cover (20,20'"'"');
drawing a known quantity of the liquid (32,32'"'"') into the chamber (28,28'"'"') by capillary action of the chamber (28,28'"'"') to only cover the reagent surface (19,19'"'"');
saturating the reagent (18,18'"'"') with the liquid while completely reacting a soluble constituent of the liquid (32,32'"'"') with the reagent (18,18'"'"') to form a reaction product on the reagent surface (19,19'"'"'); and
reflecting a light beam (33) off of the reagent (18,18'"'"') to quantitatively determine the amount of the reaction product by reflectance photometry. - View Dependent Claims (22, 23, 24, 25)
- contacting a lateral open aspect of a chamber (28,28'"'"') with a liquid (32,32'"'"') wherein the chamber (28,28'"'"') is defined between a reagent surface (19,19'"'"') of an insoluble reagent (18,18'"'"') fixedly deposited thereon and a cover (20,20'"'"');
Specification