PARTICLE FOCUSING SYSTEMS AND METHODS
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United States of America Patent
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Issued Date -
Sep 12, 2013
app pub date -
Nov 14, 2011
filing date -
Nov 18, 2010
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Abstract
A particle focusing system includes an inlet; an inertial focusing microchannel disposed in a substrate and connected to the inlet; and a pressure/flow source configured to drive a particle-containing fluid through the inertial focusing microchannel, where the inertial focusing microchannel includes a side wall having an irregular surface. The side wall includes a first irregularity protruding from a baseline surface away from a longitudinal axis of the inertial focusing microchannel. Alternatively or additionally, the first irregularity and the baseline surface form an angle more than or equal to 135 degrees. The inertial focusing microchannel may have a substantially rectangular cross-section having a height and a width, and a ratio of height to width is approximately 5:4 to 4:1. The system may also include a downstream expanding region having a side wall, where the side wall has a stepped surface.
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