Assay test device and method of making same
First Claim
1. An assay test device for determining whether a fluid under test contains a certain substance, comprising:
- a housing having a top portion and a bottom portion;
an elongated test strip disposed within said housing, said test strip containing a reagent and adapted to receive a sample of the fluid under test at a sample receiving end portion thereof;
the elongated test strip including;
a backing strip having a porous carrier strip overlying the upper surface thereof;
a fluid absorption strip at one end of the backing strip in fluid communication with porous carrier strip;
a reagent pad at the opposite end of the backing strip and connected in fluid communication with the wick and the porous carrier strip; and
an intermediate portion of the porous carrier strip is disposed between the spaced apart absorption strip and the reagent pad;
an elongated printed circuit board attached to an inner surface of the housing extending substantially parallel to the test strip for mounting electronic components;
a reaction sensor, an LED, and a sample sensor mounted side by side on one side of the printed circuit board opposite the intermediate portion of the porous carrier strip;
the sample sensor mounted on said printed circuit board including a gap between the sample sensor and the test strip for detecting the presence of the sample as it flows from the test strip sample receiving end portion using the reflectance at a first position on the test strip for generating a signal indicative of the presence of said sample;
a processor responsive to the sample presence signal for starting a timer to generate a time delay interval and for generating a time-out signal at the end of the interval;
the reaction sensor mounted in said printed circuit board and responsive to said time-out signal for detecting the certain substance in the fluid under test received on said test strip using the reflectance at a second position on the test strip to generate an electrical signal indicative of the amount of the substance detected;
said processor being responsive to said signal from said reaction sensor for generating an output signal indicative of the presence or absence of at least a predetermined quantity of the substance contained in the sample; and
a display mounted on said housing responsive to said output signal for indicating the presence or absence of a predetermined quantity of the certain substance contained within the fluid under test,wherein the sample sensor is a photo-optic sensor.
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Accused Products
Abstract
In accordance with certain disclosed embodiments of the present invention, there is provided an assay test device for determining whether a fluid under test contains a certain substance, wherein the device includes a test strip disposed at least partially within a housing for receiving the fluid under test. A sensor mounted on the housing detects the certain substance in the fluid under test received on the test strip to generate an electrical signal indicative of the amount of the substance detected. A processor responds to the signal for determining whether or not the fluid under test contains a predetermined quantity of the certain substance to generate an electrical signal. A display mounted on the housing responds to the output signal to indicate the presence or absence of a predetermined quantity of the certain substance contained within the fluid under test.
58 Citations
14 Claims
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1. An assay test device for determining whether a fluid under test contains a certain substance, comprising:
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a housing having a top portion and a bottom portion; an elongated test strip disposed within said housing, said test strip containing a reagent and adapted to receive a sample of the fluid under test at a sample receiving end portion thereof; the elongated test strip including; a backing strip having a porous carrier strip overlying the upper surface thereof; a fluid absorption strip at one end of the backing strip in fluid communication with porous carrier strip; a reagent pad at the opposite end of the backing strip and connected in fluid communication with the wick and the porous carrier strip; and an intermediate portion of the porous carrier strip is disposed between the spaced apart absorption strip and the reagent pad; an elongated printed circuit board attached to an inner surface of the housing extending substantially parallel to the test strip for mounting electronic components; a reaction sensor, an LED, and a sample sensor mounted side by side on one side of the printed circuit board opposite the intermediate portion of the porous carrier strip; the sample sensor mounted on said printed circuit board including a gap between the sample sensor and the test strip for detecting the presence of the sample as it flows from the test strip sample receiving end portion using the reflectance at a first position on the test strip for generating a signal indicative of the presence of said sample; a processor responsive to the sample presence signal for starting a timer to generate a time delay interval and for generating a time-out signal at the end of the interval; the reaction sensor mounted in said printed circuit board and responsive to said time-out signal for detecting the certain substance in the fluid under test received on said test strip using the reflectance at a second position on the test strip to generate an electrical signal indicative of the amount of the substance detected; said processor being responsive to said signal from said reaction sensor for generating an output signal indicative of the presence or absence of at least a predetermined quantity of the substance contained in the sample; and a display mounted on said housing responsive to said output signal for indicating the presence or absence of a predetermined quantity of the certain substance contained within the fluid under test, wherein the sample sensor is a photo-optic sensor. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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Specification