Self-organizing magnetic beads for biomedical applications

TL;DR

This paper introduces a simulation-based approach for designing self-organized magnetic bead structures to improve the isolation of circulating tumor cells in biomedical lab-on-chip devices.

Contribution

It presents a novel simulation tool combining micromagnetics and particle dynamics to optimize magnetic bead arrangements for biomedical applications.

Findings

Effective simulation of bead interactions and blood flow dynamics.

Design guidelines for magnetic bead-based microposts.

Potential for enhanced tumor cell isolation efficiency.

Abstract

In the field of biomedicine magnetic beads are used for drug delivery and to treat hyperthermia. Here we propose to use self-organized bead structures to isolate circulating tumor cells using lab-on-chip technologies. Typically blood flows past microposts functionalized with antibodies for circulating tumor cells. Creating these microposts with interacting magnetic beads makes it possible to tune the geometry in size, position and shape. We developed a simulation tool that combines micromagnetics and discrete particle dynamics, in order to design micropost arrays made of interacting beads. The simulation takes into account the viscous drag of the blood flow, magnetostatic interactions between the magnetic beads and gradient forces from external aligned magnets. We developed a particle-particle particle-mesh method for effective computation of the magnetic force and torque acting on the particles.