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Spermatozoa scattering by a microchannel feature: an elastohydrodynamic model.

T D Montenegro-Johnson¹, H Gadêlha², D J Smith³

¹Department of Applied Mathematics and Theoretical Physics, Centre for Mathematical Sciences , University of Cambridge, Wilberforce Road , Cambridge CB3 0WA, UK ; School of Mathematics , University of Birmingham , Edgbaston, Birmingham B15 2TT, UK ; Centre for Human Reproductive Science , Birmingham Women's NHS Foundation Trust, Mindelsohn Way, Edgbaston , Birmingham B15 2TG, UK.

Royal Society Open Science

|June 12, 2015

Summary

This summary is machine-generated.

Sperm navigation in viscous fluids is complex. This study reveals how viscosity and elasticity affect sperm scattering in microchannels, impacting their movement and potential for sorting.

Keywords:

Stokesian swimming fluid–structure interaction human sperm

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Area of Science:

Biophysics
Fluid Dynamics
Cellular Mechanics

Background:

Sperm motility relies on flagellar waves in viscous environments.
Engineered microchannels offer potential for cell manipulation.
Understanding cell-microchannel interactions is crucial for applications.

Purpose of the Study:

To investigate the elastohydrodynamic interaction of active swimmers with microchannel features.
To analyze hydrodynamic scattering of sperm by a model microchannel backstep.
To determine the influence of viscosity and elasticity on sperm behavior in microchannels.

Main Methods:

Development of a numerical method for large-amplitude elastohydrodynamic interactions.
Simulation of active swimmers interacting with a microchannel backstep feature.
Analysis of scattering based on backstep height and flagellar force parameters.

Main Results:

Hydrodynamic scattering depends on microchannel geometry and flagellar properties.
In high-viscosity conditions (e.g., cervical mucus), scattering is significant (5°-10°).
Scattering direction (positive/negative) is modulated by the interplay of viscous and elastic forces.

Conclusions:

Viscosity plays a critical role in sperm-microenvironment interactions within microchannels.
Elastohydrodynamic effects influence flagellar asymmetry and scattering angles.
Findings are relevant for sperm sorting and manipulation technologies.