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Issue 18, 2015

Bubble sorting in pinched microchannels for ultrasound contrast agent enrichment

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Abstract

Ultrasound contrast agent (UCA) suspensions contain encapsulated microbubbles with a wide size distribution, with radii between 1 and 10 μm. Medical transducers generally operate at a narrow frequency bandwidth, severely limiting the fraction of bubbles that resonates to the driving ultrasound. Thus, the sensitivity of contrast enhanced ultrasound imaging, molecular imaging with targeted bubbles, and drug delivery with microbubbles can be improved by narrowing down the size distribution of the bubble suspension. Here, we use a low-cost lab-on-a-chip method for the sorting of microbubbles by their size without external actuation, based on a microfluidic separation technique known as pinched flow fractionation (PFF). We show by numerical investigation that the inclusion of particle rotation in the pinched segment is essential for an accurate description of the sorting behavior of particles with sizes close to the pinched segment width. Successful enrichment of a polydisperse contrast agent into a bubble suspension with a narrow size distribution (radius 1.56 ± 0.30 μm) was achieved with a PFF-based microdevice. This sorting technique can be readily parallelized, and may thus lead to an easy-to-use and robust device capable of enriching ultrasound contrast agents, leading to an improvement in the sensitivity of contrast ultrasound imaging.

Graphical abstract: Bubble sorting in pinched microchannels for ultrasound contrast agent enrichment

Article information


Submitted
27 Mar 2015
Accepted
24 Jul 2015
First published
24 Jul 2015

Lab Chip, 2015,15, 3716-3722
Article type
Paper
Author version available

Bubble sorting in pinched microchannels for ultrasound contrast agent enrichment

M. P. Kok, T. Segers and M. Versluis, Lab Chip, 2015, 15, 3716 DOI: 10.1039/C5LC00370A

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