Microfluidic Applications in Sperm Selection
Summary
Microfluidic platforms harness the manipulation of fluids at the microscale to enable precise and gentle sorting of spermatozoa prior to assisted reproduction. These systems draw inspiration from the complex environment of the female reproductive tract, allowing the selection of sperm with high motility, intact DNA and optimal morphology while minimising oxidative stress and mechanical damage. By controlling channel geometry, fluid flow and surface character, microfluidic devices can replicate rheological and chemical cues to guide sperm into distinct streams. This convergence of engineering and reproductive biology has yielded rapid, operator-independent assays that improve sperm quality metrics, reduce preparation time and offer standardised protocols for both clinical practice and fundamental research.
Research from Nature Portfolio
Recent studies have applied droplet microfluidics to reproduce the curved interfaces of the fallopian tube, revealing that surface curvature modulates sperm motility modes. At low curvature, cells adopt surface-aligned progressive swimming, whereas high curvature elicits a prolonged interface-attached mode associated with increased capacitation competence. Another development utilises inertial microfluidics to isolate spermatozoa from heterogeneous suspensions in under five minutes. By exploiting size- and inertia-driven focusing, this 3D-printed device achieves high recovery rates of both motile and non-motile sperm from complex samples without compromising vitality or DNA integrity, markedly reducing processing time compared with manual techniques.
Microfluidic Applications in Sperm Selection publication trend
The graph below shows the total number of articles in microfluidic applications in sperm selection across all publications each year (not limited to Nature Index journals).
Technical terms
Microfluidics: The manipulation and control of fluids in channels with dimensions of tens to hundreds of micrometres.
Rheotaxis: The passive or active alignment and upstream swimming of spermatozoa in response to fluid flow.
Inertial microfluidics: A technique that utilises inertial lift forces in microchannels to focus and separate cells by size and density without external labels.
Biomimetic device: A system engineered to emulate biological structures or functions to achieve similar performance.
Capacitation: A physiological process that sperm undergo to gain the ability to fertilise an oocyte, involving membrane and motility changes.
References
- Swimming by Spinning: Spinning‐Top Type Rotations Regularize Sperm Swimming Into Persistently Progressive Paths in 3D. Advanced Science (2024).
- Sperm quality metrics were improved by a biomimetic microfluidic selection platform compared to swim-up methods. Microsystems & Nanoengineering (2023).
- Emerging microfluidic technologies for sperm sorting. Engineered Regeneration (2023).
- Curvature in the reproductive tract alters sperm–surface interactions. Nature Communications (2021).
- A microfluidic approach to rapid sperm recovery from heterogeneous cell suspensions. Scientific Reports (2021).
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