Massachusetts Institute of Technology

The General Hospital Corporation

University of Illinois

Daktari Diagnostics, Inc.

Grace Chen

Mehmet Toner

Rashid Bashir

Xuanhong Cheng

Aaron Oppenheimer

William Rodriguez

Nicholas Watkins

Brian Lee Wardle

Fabio Fachin

This disclosure relates to methods and devices to count particles of interest, such as cells. The methods include obtaining a fluid sample that may contain particles of interest; counting all types of particles in a portion of the sample using a first electrical differential counter to generate a first total; removing any particles of interest from the portion of the fluid sample; counting any particles remaining in the portion of the fluid sample using a second electrical differential counter after the particles of interest are removed to generate a second total; and calculating a number of particles of interest originally in the fluid sample by subtracting the second total from the first total, wherein the difference is the number of particles of interest in the sample. These methods and related devices can be used, for example, to produce a robust, inexpensive diagnostic kit for CD4+ T cell counting in whole blood samples.

Counting particles using an electrical differential counter

The devices and systems described herein include one or more fluid paths, e.g., channels, and one or more selectively permeable obstacles arranged in the fluid path(s), each including a plurality of aligned nanostructures, e.g., nanotubes or nanorods, defining an outer surface of the obstacle and an internal network of voids. The obstacle(s) can further include binding moieties applied to the outer surface and/or to the surfaces of the individual nanostructures within the obstacle(s). The devices can be manufactured by forming the dense groupings of nanostructures to extend outwards and upwards from a substrate; forming a fluidic channel, bonding the fluidic channel to the substrate; and optionally applying binding moieties to the obstacles. The devices can be used to manipulate cells within fluid samples.

Microscale and nanoscale structures for manipulating particles

Growing community of inventors

Cambridge, MA, United States of America

Grace Chen