US 6,900,889 B2 · Submersible light-directing member for material excitation in microfluidic devices

Abstract

A system for material excitation in microfluidic devices is described. Aspects of the invention resemble a submerged periscope when in use. They allow for light to be redirected along a more advantageous trajectory as does the maritime device. A prism with a reflecting surface may be used to direct a laser beam along one or more microfluidic trenches or channels. Alternatively, a reflecting surface may be provided in connection with a simple support. Directing a beam along multiple paths is preferably accomplished by scanning a single laser across or around the reflecting surface provided. Provision may be made for at least a portion of the submersible used to function as an electrode to assist in electrokinetically driving fluids and/or ions within the microfluidic device.

Claims48

Dependent claims

A system for use in the optical detection of sample material in a-channel of a microfluidic comprising:

a microfluidic device having an opening in a first surface and at least one channel having a detection zone in fluid communication with said opening;
a light-directing member separate from said microfluidic device, said member comprising a distal end, and a reflecting surface adjacent said distal end, said distal end being positionable within said opening such that when a light source is aimed at said reflecting surface, light reflects off said reflecting surface towards said detection zone within said at least one channel of said microfluidic device;
and
a detector positioned to receive non-reflected light from said detection zone.

1 more element

Dependencies are inferred from the claim text.

Submersible light-directing member for material excitation in microfluidic devices

Life of this patent

Submersible light-directing member for material excitation in microfluidic devices

Life of this patent

Abstract

Claims48