|Title of Invention||
" A RAPID DIAGNOSTIC TEST SYSTEM AND A PROCESS THEREFORE"
|Abstract||The invention relates to a rapid diagnostic test system comprising a light source (250) for illuminating a medium (326) containing a sample under test, wherein the medium (326) comprises a labeling substance that binds a persistent fluorescent structure to a target analyte; and a first photodetector (342) positioned to measure light from a test area (226) of the medium (326). characterized in that the first photodetector (342) and the medium (326) are contained in a single-use module (710).|
|Full Text||OPTOELECTRONIC RAPID DIAGNOSTIC TEST SYSTEM
 Rapid diagnostic test kits are currently available for testing for a wide variety of
medical and environmental conditions. Commonly, such test kits employ an analyte-specific
binding assay to detect or measure a specific environmentally or biologically relevant
compound such as a hormone, a metabolite, a toxin, or a pathogen-derived antigen.
 A convenient structure for performing a binding assay is a "lateral flow" strip
such as test strip 100 illustrated in Fig. 1. Test strip 100 includes several "zones" that are
arranged along a flow path of a sample. In particular, test strip 100 includes a sample
receiving zone 110, a labeling zone 120, a capture or detection zone 130, and an absorbent
zone or sink 140. Zones 110,120,130, and 140, which can be attached to a common backing
150, are generally made of a material such as chemically treated nitrocellulose that allows
fluid flow by capillary action.
 An advantage of test strip 100 and of a lateral flow immunoassay generally is the
ease of the testing procedure and the rapid availability of test results. In particular, a user
simply applies a fluid sample such as blood, urine, or saliva to sample receiving zone 110.
Capillary action then draws the liquid sample downstream into labeling zone 120, which
contains a substance for indirect labeling of a target analyte. For medical testing, the labeling
substances are generally immunoglobulin with attached dye molecules but alternatively may
be a non-immunoglobulin labeled compound that specifically binds the target analyte.
 The sample flows from labeling zone 120 into capture zone 130 where the sample
contacts a test region or stripe 132 containing an immobilized compound capable of
specifically binding the labeled target analyte or a complex that the analyte and labeling
substance form. As a specific example, analyte-specific immunoglobulins can be
immobilized in capture zone 130. Labeled target analytes bind the immobilized
immunoglobulins, so that test stripe 132 retains the labeled analytes. The presence of the
labeled analyte in the sample generally results in a visually detectable coloring in test
stripe 132 that appears within minutes of starting the test.
 A control stripe 134 in capture zone 130 is useful for indicating that a procedure
has been performed. Control stripe 134 is downstream of test stripe 132 and operates to bind
and retain the labeling substance. Visible coloring of control stripe 134 indicates the
presence of the labeling substance resulting from the liquid sample flowing through capture
zone 130. When the target analyte is not present in the sample, test stripe 132 shows no
visible coloring, but the accumulation of the label in control stripe 134 indicates that the
sample has flown through capture zone 130. Absorbent zone 140 then captures any excess
 One problem with these immunoassay procedures is the difficulty in providing
quantitative measurements. In particular, a quantitative measurement may require
detennining the number of complexes bound in test stripe 132. Measuring equipment for
such determinations can be expensive and is vulnerable to contamination since capture zone
120, which contains the sample, is generally exposed for measurement. Further, the intensity
of dyes used in the test typically degrade very rapidly (e.g., within minutes or hours) when
exposed to light, so that quantitative measurements based on the intensity of color must
somehow account for dye degradation. On the other hand, a home user of a single-use rapid
diagnostic test kit may have difficulty interpreting a test result from the color or shade of test
stripe 132, particularly since dye intensity within minutes.
 Another testing technology, which is generally performed in laboratories,
simultaneously subjects a sample to a panel of tests. For this type of testing, portions of a
sample can be applied to separate test solutions. Each test solution generally contains a
labeled compound that specifically binds a target analyte associated with the test being
performed. Conventionally, the tests are separate because the labeled compounds that bind
different target analytes are typically difficult to distinguish if combined in the same solution.
 U.S. Pat. No. 6,630,307, entitled "Method of Detecting an Analyte in a Sample
Using Semiconductor Nanocrystals as a Detectable Label," describes a process that labels
binding compounds for different target analytes with different types of semiconductor
nanocrystals or quantum dots. The different types of nanocrystals when exposed to a suitable
wavelength of light fluoresce to produce light of different wavelengths. Accordingly, binding
compounds labeled with different combinations of quantum dots can be distinguished by
spectral analysis of the fluorescent light emitted from the quantum dots.
 In accordance with an aspect of the invention, an optoelectronic rapid diagnostic
test system can include a light source such as a light emitting diode (LED) or a laser diode
that illuminates a test structure such as a test strip. The test structure preferably uses a
persistent fluorescent substance such as a semiconductor nanocrystal or a quantum dot in a
labeling substance for a target analyte. The fluorescent substance when bound to the target
analyte can be immobilized at a test stripe or region and exposed to light from the light
source. The persistent fluorescent substance then fluoresces to emit light of a characteristic
wavelength. An electronic photodetector or an imaging device can then detect the light
emitted from the test stripe at the characteristic wavelength and generate an electric signal
indicating a test result. The test results can be readily quantified since the intensity of the
emitted light does not have the rapid time dependence of dyes that are conventionally
employed in rapid test systems.
 The optoelectronic portion of the diagnostic test kit can be inexpensively
manufactured for disposable or single-use applications. The electronic nature of the result
signal also lends itself to processing and transmission using many electronic systems. For
example, control logic in a single-use test module can activate a results indicator (e.g., an
external LED or alphanumeric LCD) to unambiguously indicate the test result. Alternatively,
a single-use test module can include an interface for connection to reusable data processing
equipment. The electronic interface avoids the need for reusable equipment to directly
measure or be exposed to materials containing the target analyte and thereby reduces the
chance for cross contamination during a sequence of tests.
 One specific embodiment of the invention is a rapid diagnostic test system
including a photodetector and a light source. The light source illuminates a medium
containing a sample, and the photodetector measures light from a test area of the medium
when the medium is illuminated.
 In one variation of this embodiment of the invention, the medium can be a lateral-
flow strip for performing a binding assay and includes a labeling substance that binds a
fluorescent structure such as a semiconductor nanocrystal or a quantum dot to a target
analyte. The photodetector then measures light having a frequency characteristic of
fluorescent light resulting from illuminating the fluorescent structure.
 The rapid diagnostic test system can further include a second photodetector, and
an optical system positioned to receive light from the test area and direct light to the two
photodetectors. In particular, the optical system, which can be implemented using diffractive
elements or thin-film color filters, filters or directs different colors of light for separate
measurement. For example, the optical system can separate the light having a first frequency
from light having a second frequency, direct the light have the first frequency for
measurement by the first photodetector, and direct the light have the second frequency for
measurement by the second photodetector. With the color separation or filtering, the medium
can include a first labeling substance that binds a first fluorescent structure to a first target
analyte and a second labeling substance that binds a second fluorescent structure to a second
target analyte. When illuminated, the first fluorescent structure emits light having the first
frequency, which the first photodetector measures; and the second fluorescent structure emits
light having the second frequency, which the second photodetector measures.
 The photodetector(s) and the medium can be contained in a single-use module that
is either a stand-alone device or that requires connection to a reusable module to complete a
test. For example, the reusable module may have a receptacle into which the single-use
module is inserted for communication of electrical and/or optical signals.
 Another specific embodiment of the invention is a process for rapid diagnostic
testing. The test process generally includes: applying a sample to a medium in a single-use
module that includes a photodetector; illuminating at least a portion of the medium; and
generating an electrical test result signal from the photodetector. The electrical test result
signal can be used in a variety of ways to indicate the test result to a user. For example, one
variation of the process includes activating a display such as an alphanumeric display or an
LED on the single-use module in response to the electrical test result signal. An alternative
variation of the process includes outputting the electrical test signal from the single-use
module to a reusable module. The reusable module can then implement a user interface that
informs a user of the test result.
BRIEF DESCRIPTION OF THE DRAWINGS
 Fig. 1 shows a conventional test strip for an analyte-specific binding assay.
 Figs. 2A, 2B, 2C, and 2D show cross-sectional views of optoelectronic rapid
diagnostic test kits in accordance with alternative embodiments of the invention.
 Fig. 3 illustrates a test system in accordance with an embodiment of the invention
using a diffractive optical substrate for focusing and filtering.
 Fig. 4 illustrates a test system in accordance with an embodiment of the invention
using refractive lenses and thin-film color filters for optical signals.
 Fig. 5 is a cutaway view of a test system in accordance with an embodiment of the
invention containing a battery with a pull-tab for test activation.
 Fig. 6 is a perspective view of a test system in which the sample receiving zone of
a test strip is inside a case and accessible through an opening in the case.
 Figs. 7A and 7B are perspective views of test systems in accordance with
embodiments of the invention in which single-use optoelectronic devices have electrical
interfaces for communication with reusable test stations.
 Use of the same reference symbols in different figures indicates similar or
 In accordance with an aspect of the invention, a rapid diagnostic test system
employs a disposable optoelectronic device that generates an electronic test result signal. The
optoelectronic device preferably contains or is used with a test strip or test structure using a
labeling substance that binds a persistent fluorescent substance such as a quantum dot to the
target analyte. The test system can include a light source that illuminates a test area with
light of the proper wavelength to cause fluorescence and a photodetector such as a
photodiode that measures the resulting fluorescent light to detect the target analyte.
 Fig. 2A shows a cross-section of a test system 200 in accordance with an
embodiment of the invention where an optoelectronic device reads a test result. In various
embodiments of the invention, system 200 can test for any desired medical or environmental
condition or substance including but not limited to glucose, pregnancy, infectious diseases,
cholesterol, cardiac markers, signs of drug abuse, chemical contaminants, or biotoxins.
System 200 includes a case 210, a test strip 220, and a circuit 240 including a light source
250, a battery 252, a control unit 254, and photodetectors 256 and 258.
 Case 210 can be made of plastic or other material suitable for safely containing
the liquid sample being analyzed. In the illustrated embodiment, case 210 has an opening
through which a portion of test strip 220 extends for application of the sample to a sample
receiving zone 222 of test strip 220. Alternatively, test strip 220 can be enclosed in case 210,
and application of the sample to test strip 220 is through an opening in case 210.
 Test strip 220 can be substantially identical to a conventional test strip such as test
strip 100 described above in regard to Fig. 1, but in test strip 220, the substance for labeling
the target analyte preferably includes a quantum dot or a similar structure that fluoresces at a
constant intensity when exposed to light of the proper wavelength. For a test, a user applies a
sample to sample receiving zone 222 of test strip 220. The sample flows from receiving zone
222 into a labeling zone 224 inside case 210. The labeling substance binds the quantum dot
or other persistent fluorescent structure to the target analyte. The sample including the
labeling substance then enters a capture or detection zone that includes a test stripe 226 and a
control stripe 228. Test stripe 226 is a region containing an immobilized substance selected
to bind and retain the labeled complex containing the target analyte and the quantum dot.
Control stripe 228 is a region containing an immobilized substance selected to bind to and
retain to the labeling substance.
 Light source 250 in circuit 240 illuminates test stripe 226 and control stripe 228
during testing. Light source 250 is preferably a light emitting diode (LED) or a laser diode
that emits light of a frequency that causes fluorescence of any quantum dots in test stripe 226
or control stripe 228. Generally, the quantum dots fluoresce under a high frequency (or short
wavelength) light, e.g., blue to ultraviolet light, and the fluorescent light has a lower
frequency (or a longer wavelength) than the light from light source 250.
 Photodetectors 256 and 258 are in the respective paths of light emitted from test
stripe 226 and control stripe 228 and measure the fluorescent light from the respective stripes
226 and 228. A baffle or other light directing structure (not shown) can be used to direct
light from test stripe 226 to photodetector 256 and light from control strip 228 to
photodetector 258. In the embodiment of Fig. 2A, photodetectors 256 and 258 have
respective color filters 257 and 259 that transmit light of the frequency associated with the
selected fluorescent light but blocks other frequencies, especially the frequency of light
emitted from light source 250. Additionally, the labeling substance can include two types of
quantum dots. One of the types of quantum dots emits a first wavelength of light and is
attached to a substance that binds to the target analyte and to test stripe 226. The other type
of quantum dot emits light of a second wavelength and binds to control stripe 228. Color
filters 257 and 259 can then be designed so that photodetector 256 measures fluorescent light
from the type of quantum dot that test stripe 226 traps when the target analyte is present
while photodetector 258 measures fluorescent light from the type of quantum dot that control
strip 228 traps.
 Quantum dots provide fluorescent light at an intensity that is consistent for long
periods of time, instead of rapidly degrading in the way that the intensity of conventional test
dyes degrade when exposed to light. As a result, the intensity measurements from detectors
256 and 258, which indicate the amount of fluorescent light, are proportional to the number
of quantum dots in the respective stripes 226 and 228 and are not subject to rapid changes
with time. These intensity measurements thus provide a quantitative indication of the
concentration of the target analyte.
 Control unit 254, which can be a standard microcontroller or microprocessor with
an analog-to-digital converter, receives electrical signals from detectors 256 and 258. The
electric signals indicate the measured intensities from stripes 226 and 228, and control unit
254 processes the electrical test signals and then operates an output system as required to
indicate test results. In Fig. 2A, for example, the output system includes LED lights 261 and
263. Control unit 254 can activate one light 261 when the fluorescent light from the test
stripe 226 is above a threshold level marking the presence of the target analyte in test stripe
226. Control unit 254 can activate the other light 262 when the intensity of fluorescent light
from test stripe 226 is below the threshold level but the intensity that photodetector 258
measures from control stripe 228 is above a threshold level therefore indicating that the
sample has passed through test stripe 226. A system with three or more LEDs or particular
patterns of flashing of one or more LEDs can similarly indicate other test results (e.g., an
inconclusive test) or a test status (e.g., to indicate a test in progress).
 Fig. 2B illustrates a test system 200B that is similar to test system 200 but
includes an alphanumeric display 264 for output of test results. A two or three character
LCD array, for example, could provide numeric output based on the measured intensity of
fluorescent light from test stripe 226. Display 264 may be used in conjunction with LEDs
such as illustrated in Fig. 2A or other output systems.
 Fig. 2C illustrates a test system 200C using yet another test result output
technique. In particular, test system 200C outputs an electric signal via external terminals
266 to indicate the test result. As described further below, test system 200C can thus provide
the electric test result signal to an electronic device (not shown) that can process, convert, or
transmit the test result signal. An advantage of test system 200C is that circuit components
such as battery 252 can be removed from circuit 240 to reduce the cost of test system 200C,
and power can be supplied to circuit 240 through external terminals 266.
 Fig. 2D illustrates a test system 200D in accordance with an embodiment of the
invention that employs an imaging system 255 for detection of fluorescent light. Imaging
system 255 can include a two-dimensional CCD or CMOS imaging array or similar
optoelectronic imager capable of generating an electronic representation of an image (e.g., an
array of pixel values representing a captured image or frame). Control unit 254 can analyze
digital images from imaging system 255 to determine the intensity and color of light emitted
from stripes 226 and 228. Test results can then be output based on the analysis of the image.
 Some advantages of test systems 200, 200B, 200C, and 200D include the ease
with which a user receives the test result and the consistency and accuracy of the test results.
LED lights 261 and 262 and alphanumeric displays provide results that a user can easily read.
In contrast, a conventional rapid diagnostic test relying on a dye to indicate a test result may
require that a user distinguish a shade or intensity in a test stripe. This interpretation may be
subject to user judgment errors and to dyes that fade within minutes after exposure to light.
In contrast, the fluorescence from quantum dots does not fade rapidly with time, and circuit
240 produces a non-subjective and/or quantitative interpretation of the intensity of the
 Another advantage of test systems employing quantum dots is the ability to test
for several analytes in the same test stripe. Fig. 3, for example, shows a portion of a test
system 300 in accordance with an embodiment of the invention that tests for the presence of
multiple target analytes in a sample. Test system 300 includes a test strip 320, an
optoelectronic circuit 340, and an intervening optical system 330.
 Test strip 320 can be substantially identical to test strip 220, which is described
above, but test strip 320 includes multiple labeling substances corresponding to different
target analytes. Each labeling substance binds a corresponding type of quantum dot to a
corresponding target analyte. The quantum dots for different labeling substances preferably
produce fluorescent light having different characteristic wavelengths (e.g., 525, 595, and 655
nm). Suitable quantum dots having different fluorescent frequencies and biological coatings
suitable for binding to analyte-specific immunoglobulins are commercially available from
Quantum Dot, Inc. Test strip 320 includes a test stripe 326 that is treated to bind to and
immobilize the different complexes including the target analytes and respective labeling
substances. Testing for multiple analytes in the same test structure is particularly desirable
for cholesterol or cardiac panel test system that measures multiple factors.
 Light source 250 illuminates test stripe 326 with light of a wavelength that causes
all of the different quantum dots to fluoresce. Fluorescent light from test strip 326 will thus
contain fluorescent light of different wavelengths if more than one of the target analytes are
present in test strip 326. Optical system 330 separates the different wavelengths of light and
focuses each of the different wavelengths on a corresponding photodetector 342, 343, or 344.
Photodetectors 342, 343, and 344, which can further include appropriate color filters, thus
provide separate electrical signals indicating the number of quantum dots of the respective
types in test stripe 326 and therefore indicate concentrations of the respective target analytes.
Control and output circuits (not shown) can then provide the test results to a user or a
separate device as described above in regards to Figs. 2A, 2B, and 2C.
 Optical system 330 in Fig. 3 is an optical substrate providing diffractive focusing
of the different wavelengths on different photodetectors 342, 343, and 344. In one
embodiment of the invention, optical system 330 includes an optical substrate of a material
such as glass or plastic with opaque regions or surface discontinuities in a pattern that
provides a desired separation or focusing of the different fluorescent wavelengths. However,
diffractive optical elements such as optical system 330 can be fabricated inexpensively using
other processes and structures.
 Fig. 4 shows a portion of test system 400 that is similar to test system 300 of
Fig. 3, but test system 400 includes an optical system 430 formed from refractive lenses 431,
432, 433, and 434 and thin-film color filters 436, 437, and 438 on prisms. In particular, lens
431 receives and collimates fluorescent light emitted from test stripe 326 when light source
250 illuminates quantum dots in test stripe 326. Color filter 436 is designed to transmit light
of a frequency corresponding to the quantum dots that photodetector 342 measures and to
reflect light of the frequency emitted by light source 250 or resulting from fluorescence of
other types of quantum dots. Thin films that transmit light of the desired wavelength but
reflect light of the other wavelengths can be designed and constructed from a stack of
dielectric layers having thicknesses and refractive indices that achieve the desired
characteristics. Alternatively, color filter 436 could include a diffractive index grating filter or
a colored material. Lens 432 focuses the light transmitted through filter 436 onto the
photosensitive area of detector 342, which can include a further color filter for additional
selectivity to the desired color of light.
[00411 Light reflected from filter 436 is incident on filter 437. Filter 437 is designed to
reflect light of the wavelength corresponding to detector 343 and transmit the unwanted
wavelengths. Lens 433 focuses the light reflected from filter 437 onto the photosensitive area
of detector 343. Light transmitted through filter 437 is incident of filter 438, which is
designed to reflect light of the wavelength corresponding to detector 344 and transmit the
unwanted wavelengths. Lens 434 focuses the light reflected from filter film 438 onto the
photosensitive area of detector 344.
 Optical systems 330 and 430 merely provide illustrative examples of an optical
system using diffractive elements or thin-film filters for separating different wavelengths of
light for measurements. Optical systems using other techniques (e.g., a chromatic prism)
could also be employed to separate or filter the fluorescent light. The characteristics and
geometry of such optical systems will generally depend on the number of different types of
quantum dots used and the wavelengths of the fluorescent light.
 Fig. 5 illustrates a cutaway view of a test system 500 in accordance with an
embodiment of the invention. As illustrated, test system 500 includes a case 510 having a
first slot at one end through which a test strip 520 extends and second slot at the opposite end
through which a pull tab 530 extends. An optoelectronic circuit 540 including a light source
250, batteries 252, and other desired circuit elements is enclosed inside case 510. An optical
system (not shown) may additionally be included in case 510 for separation of optical signals
or for focusing light onto one or more photodetectors in circuit 540.
 Test strip 520 can be substantially identical to test strip 220 or 320, which are
described above for measuring one or more target analytes. Pull tab 530 acts as a switch and
is initially between a battery 252 and a contact that connects battery 252 to provide power to
circuit 540. For testing, a user applies a sample to the exposed portion of test strip 520 and
pulls tab 530 out of case 510 to activate circuit 540. Circuit 540 then illuminates test strip
520, measures the intensity of the resulting fluorescence from a target area of test strip 520,
and generates an output signal.
 Fig. 6 illustrates a test system 600 in accordance with an embodiment of the
invention that encloses a test strip 520 inside a case 610. For sample introduction, case 610
includes an opening 612 that funnels the sample onto a sample receiving zone of test strip
520. An advantage of case 610 is an improved isolation of test strip 520 after introduction of
the sample. A cap (not shown) can men be used to cover opening 612 to further improve
isolation of the sample during handling of test system 600 after introduction of the sample.
Fig. 6 also illustrates that test system 600 can include a pull tab 530 for beginning the
electrical operation of test kit 600 and external LEDs 614 and 616 for indication of test status
 Fig. 7A illustrates a test system 700 in accordance with yet another embodiment
of the invention. Test system 700 includes a single-use module 710 and a reusable module
720. Single-use module 710 includes a test strip 520 that is accessible through an opening
712 in a case 714 in a manner similar to that described above in regard to test system 600 of
Fig. 6. Single-use module 710 has an electrical interface including terminals 716 that can be
plugged into receptacle 722 of reusable module 720. Reusable module 720 can then display a
test result on an LCD display 724 or any other suitable user interface.
 Modules 710 and 720 collectively form an optoelectronic circuit capable of
reading, analyzing, and providing test results. Generally, single-use module 710 includes one
or more photodetectors and optical filters for the fluorescent light generated from test strip
520. The light source is generally in single use module 710 but can alternatively be included
in reusable module 720 when single-use module 710 has a window or other optical interface
that can convey light of the desired frequency into module 710. Reusable module 720 can
include the other circuit elements such as control circuits, batteries, and user interface
electronics such as display 724. Through receptacle 722 and terminals 716, reusable module
720 can thus supply power to single-use module 710 and can receive a test result signal. In
one embodiment, the test result signal is the analog electric output signals directly from
photodetectors in single-use module 710. Alternatively, single-use module 710 can include
amplifiers, analog-to-digital converters, and/or other initial signal processing elements that
provide a preprocessed signal to reusable module 720.
 An advantage of test system 700 is reduction in the cost of the disposable or
single-use module 710. In particular, by including more circuit elements in reusable module
720, the cost for repeated tests is decreased and the sophistication of the test result output can
be increased (e.g., with alphanumeric or audible output instead of warning lights). This is
particularly useful for tests that are repeated such as home testing of glucose levels or almost
any diagnostic test performed at a doctor's office. Additionally, reusable module 720
receives an electric signal from single-use module 710 and does not need to directly measure
test strip 520 containing a sample. Reusable module 720 is thus not subject to sample
contamination that might affect the results of subsequent tests.
 Fig. 7B illustrates a test system 750 illustrating using the single-use module 710
with a more elaborate reusable module 730. In the illustrated embodiment, reusable module
730 includes a receptacle 732, a display 734, a keypad 736, and a port 738. Receptacle 732
can be substantially identical to receptacle 722 of Fig. 7 A and serves to accommodate single-
use module 710 for transmission of power and signals between the two modules 730 and 710.
Display 734, which can be an LCD display, a touch screen, or a similar device, is part of the
user interface of reusable module 730 and can display any desired information including test
results and control information. Keypad 736 provides a user interface for input of data or
system control parameters. Port 738 provides a connection to other systems such as a
computer or communication network and can be, for example, a jack for modem
communications via telephone lines, USB or fire wire, or Ethernet standards to name a few.
 Whether a test system employs a relatively simple reusable module 720 as in
system 700 of Fig. 7A or a more complex reusable module 730 as shown in Fig. 7B will
generally depend on the type of testing performed and the results needed. For example, a
commercial product might include one reusable module 720 with a set of six or more single-
use modules 710 with the intent being that reusable module 720 is used only a limited
number of times (e.g., just with the single use modules in the same package). In contrast,
reusable module 730 may be intended for use in a large number of tests and sold separately
from single-use modules 710. Further, single-use modules that perform different tests may
be made compatible with a standardized reusable module 730, which would permit use of
reusable module 730 in a doctor's office, for example, for control and output of many
different types of tests.
 Although the invention has been described with reference to particular
embodiments, the description is only an example of the invention's application and should not
be taken as a limitation. Various adaptations and combinations of features of the
embodiments disclosed are within the scope of the invention as defined by the following
WE CLAIM :
1. A rapid diagnostic test system comprising :
a light source (250) for illuminating a medium (326) containing a
sample under test, wherein the medium (326) comprises a labeling
substance that binds a persistent fluorescent structure to a target
a first photodetector (342) positioned to measure light from a test area
(226) of the medium (326).
characterized in that the first photodetector (342) and the medium
(326) are contained in a single-use module (710).
2. The system as claimed in claim 1, wherein the persistent fluorescent
structure comprises a quantum dot.
3. The system as claimed in claim 1 or 2, further comprising:
a second photodetector (344); and an optical system (330) positioned
to receive light from the test area (326), wherein the optical system
(330) separates light having a first frequency from light having a
second frequency so that the first photodetector (342) measures light
having the first frequency and the second photodetector (344)
measures light having the second frequency.
4. The system as claimed in claim 1, 2 or 3, wherein the first
photodetector comprises a portion of an imaging array (255) that
captures an image containing the test area (226) of the medium (220).
5. The system as claimed in claim 4, further comprising a reusable
module (720) having a receptacle (722) into which the single-use
module (710) can be inserted for communication of test signals
between the single use module (710) and the reusable module (720),
wherein the reusable module (720) implements a user interface
capable of indicating a test result.
6. A process for rapid diagnostic testing comprising:
applying a sample to a medium (220) containing a labeling substance
that binds a persistent fluorescent structure to a target analyte;
illuminating at least a portion of the medium (220); and
generating an electrical signal indicating a detection of fluorescent
characterized in that the medium (220) is in a single use structure
(710) that includes a photodetector (256) that measures fluorescent
light from the persistent fluorescent structure.
7. The process as claimed in claim 6, wherein the persistent fluorescent
structure comprises a quantum dot.
8. The process as claimed in claim 7, comprising :
generating an electrical test result signal from the photodetector (256)
in the single use module (710);
transmitting the electrical test result signal from the signal-use module
(710) to as reusable module (720); and
indicating a test result on the reusable module.
TITLE "A RAPID DIAGNOSTIC TEST SYSTEM
AND A PROCESS THEREFOR"
The invention relates to a rapid diagnostic test system comprising a light source
(250) for illuminating a medium (326) containing a sample under test, wherein
the medium (326) comprises a labeling substance that binds a persistent
fluorescent structure to a target analyte; and a first photodetector (342)
positioned to measure light from a test area (226) of the medium (326).
characterized in that the first photodetector (342) and the medium (326) are
contained in a single-use module (710).
|Indian Patent Application Number||259/KOL/2005|
|PG Journal Number||11/2013|
|Date of Filing||31-Mar-2005|
|Name of Patentee||ALVERIX, INC.|
|Applicant Address||2590 NORTH FIRST, SUITE 100, SAN JOSE, CALIFORNIA 95131|
|PCT International Classification Number||C12Q 1/68|
|PCT International Application Number||N/A|
|PCT International Filing date|