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Fluorescence detector for microfluidic diagnostic system

  • US 10,695,764 B2
  • Filed: 10/27/2017
  • Issued: 06/30/2020
  • Est. Priority Date: 03/24/2006
  • Status: Active Grant
First Claim
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1. A method of detecting the presence of one or more polynucleotides in a microfluidic cartridge comprising a plurality of separate microfluidic channels, a first and a second amplification chamber aligned along a first cartridge axis and a third and a fourth amplification chamber aligned along a second cartridge axis substantially parallel to the first cartridge axis, each amplification chamber configured to contain or more polynucleotides, the method comprising:

  • positioning a scanning read head in a first position relative to the microfluidic cartridge, the scanning read head comprising a first optical detection block and a second optical detection block, the first optical detection block comprising a first detection unit and a second detection unit aligned along a first detection axis, the first detection unit and the second detection unit each comprising a light source and a light detector, wherein, in the first position, the first detection axis of the first optical detection block and the first cartridge axis are substantially coplanar in a first plane perpendicular to a surface of the microfluidic cartridge;

    transmitting light using the light source of the first detection unit of the first optical detection block on to the first amplification chamber and transmitting light using the light source of the second detection unit of the first optical detection block on to the second amplification chamber;

    receiving, in the light detector of the first detection unit of the first optical detection block, light emitted from the first amplification chamber and receiving, in the light detector of the second detection unit of the first optical detection block, light emitted from the second amplification chamber; and

    moving the scanning read head in a direction transverse to the first detection axis to a second position relative to the microfluidic cartridge, wherein, in the second position, the first detection axis of the first optical detection block and the second cartridge axis are substantially coplanar in a second plane perpendicular to the surface of the microfluidic cartridge.

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