Optical arrangement for assay reading device
DCFirst Claim
1. An assay result reading device for reading the result of an assay performed using a test strip, the device comprising:
- at least one light source capable of emitting light incident upon at least first, second, and third spatially separated zones of the test strip, the light source comprising three light emitting diodes (LED'"'"'s), each of which is aligned with and laterally offset from a corresponding test strip zone;
a first baffle so sized and positioned as to prevent light emitted by the first LED from illuminating the third zone;
a second baffle so sized and positioned as to prevent light emitted by the third LED from illuminating the first zone;
a first photodetector so positioned to detect light emanating from the first zone and the second zone; and
a second photodetector so positioned as to receive light emanating from the second zone and the third zone.
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Accused Products
Abstract
Disclosed, in one aspect, is an assay result reading device for reading the result of an assay performed using a test strip, the device comprising: a light source or sources, said light source/s emitting light incident upon at least two, spatially separated zones of the test strip; and a photodetector which detects light emanating from each of the two said zones; in a further aspect is disclosed an assay result reading device for reading the result of an assay performed using a test strip, the device comprising: at least one light source incident upon a zone of the test strip; and at least two photodetectors both of which are able to detect some of the light emanating from the zone of the test strip illuminated by the light source.
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Citations
34 Claims
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1. An assay result reading device for reading the result of an assay performed using a test strip, the device comprising:
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at least one light source capable of emitting light incident upon at least first, second, and third spatially separated zones of the test strip, the light source comprising three light emitting diodes (LED'"'"'s), each of which is aligned with and laterally offset from a corresponding test strip zone; a first baffle so sized and positioned as to prevent light emitted by the first LED from illuminating the third zone; a second baffle so sized and positioned as to prevent light emitted by the third LED from illuminating the first zone; a first photodetector so positioned to detect light emanating from the first zone and the second zone; and a second photodetector so positioned as to receive light emanating from the second zone and the third zone. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. An assay result reading device for reading the result of an assay performed using a test strip, the device comprising:
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at least one light source capable of emitting light incident upon at least first, second, and third zones of the test strip; and at least two photodetectors, the first of which detects light emanating from the first zone and second zone of the test strip; and
the second of which detects light emanating from the second zone and the third zone of the test strip.
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13. A method of determining a result of an assay performed using a test strip, the method comprising:
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positioning a test strip, having first, second, and third spatially separated zones, in relation to an assay result reader, the reader comprising a housing enclosing at least at least three light sources and two photodetectors; and measuring at least one light level received by at least one photodetector; and
determining, using a processor and based on the at least one light level, the result of the assay performed on the test strip; anddisplaying a value indicative of the result of the assay; wherein; each light source is aligned with and laterally offset from a corresponding test strip zone; the first photodetector is so positioned as to receive light emanating from the first zone and the second zone; and the second photodetector is so positioned as to receive light emanating from the second zone and the third zone. - View Dependent Claims (14)
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15. An assay result reading device for reading the result of an assay performed using a test strip, the device comprising:
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at least one light source system configured to illuminate at least two spatially separated zones of the test strip; a photodetector system configured to detect light emanating from each of the two said zones; and a computation circuit responsive to signals generated by the photodetector representing the presence or absence of a fluid sample in at least one of the zones to; calculate a flow rate for a fluid flowing along the test strip; compare the calculated flow rate to upper and lower limits; and reject the assay result if the calculated flow rate is outside the upper and lower limits. - View Dependent Claims (16, 17)
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18. An assay result reading device for reading the result of an assay performed using a test strip, the device comprising:
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at least one light source system configured to illuminate at least two spatially separated zones of the test strip; a photodetector system configured to detect light emanating from each of the two said zones; and a computation circuit, responsive to an input signal representing the amount of an analyte or the rate of accumulation of an analyte in at least one of the zones of the test strip, to; compare the input signal to a first threshold; compare the input signal to a second threshold, the second threshold being less than the first threshold; generate a first output signal if the input signal exceeds the first threshold or a second output signal if the input signal is less than the second threshold. - View Dependent Claims (19, 20, 21)
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22. A device, comprising:
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a housing configured to retain a test strip in a test position; a light source system configured to illuminate selectively first, second, and third different zones of a test strip retained in the test position; a first light detector configured to (a) detect light from the first zone of a test strip retained in the test position when the light source illuminates the first zone, and (b) detect light from the second zone of a test strip retained in the test position when the light source illuminates the second zone; a second light detector configured to (a) detect light from the third zone of a test strip retained in the test position when the light source illuminates the third zone, and (b) detect light from the second zone of a test strip retained in the test position when the light source illuminates the second zone; and a processor configured to receive respective signals indicative of light detected by the first and second light detectors. - View Dependent Claims (23, 24, 25, 26, 27, 28, 29)
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30. A method, comprising:
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allowing a liquid to advance along a test strip after having been applied thereto; illuminating a first zone of the test strip with light from a first light source; detecting light from the illuminated first zone using a first light detector; illuminating a second zone of the test strip with light from a second light source; detecting light from the illuminated second zone using the first light detector; detecting light from the illuminated second zone using a second light detector; illuminating a third zone of a test strip with light from a third light source; detecting light from the illuminated third zone using the second light detector; receiving, with a processor, respective signals from the first and second light detectors, the signals indicative of the detected light; determining, with the processor, a value indicative of a rate at which the liquid advances along the test strip based on the received signals; and performing at least one action based on the determined value. - View Dependent Claims (31, 32)
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33. A device, comprising:
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a housing; a lateral flow test strip disposed in a test position with respect to the housing, the test strip comprising a sample receiving portion extending from the housing and first, second, and third zones disposed within the housing, the test strip defining a flow path along which liquid received by the sample receiving portion can sequentially flow to the first, second, and third zones of the test strip; a light source system configured to illuminate selectively the first, second, and third zones of the test strip; a first light detector configured to; detect light from the first zone of the test strip when the light source illuminates the first zone; output first signals indicative of light detected from the first zone; detect light from the second zone of the test strip when the light source illuminates the second zone; and output second signals indicative of light detected from the second zone; a second light detector configured to; detect light from the third zone of a test strip when the light source illuminates the third zone; output third signals indicative of light detected from the third zone; detect light from the second zone of a test strip when the light source illuminates the second zone; and output fourth signals indicative of light detected from the second zone, and a processor configured to receive first and second signals from the first detector and to receive third and fourth signals from the second detector and to determine the presence of an analyte in liquid received by the sample receiving member based at least in part upon the received first, second, third, and fourth signals. - View Dependent Claims (34)
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Specification