Rheotaxis-based sperm separation using a biomimicry microfluidic device

Area of Science:

• Reproductive Biology
• Biomedical Engineering
• Microfluidics

Background:

• Current sperm selection methods in assisted reproduction bypass natural barriers, raising concerns.
• Optimizing sperm selection is critical for treatment success and offspring health.

Purpose of the Study:

• To develop a biomimicry microfluidic device for efficient and natural sperm selection.
• To overcome limitations of current clinical sperm selection practices.

Main Methods:

• A microfluidic device inspired by the female reproductive tract anatomy was designed.
• The device utilizes sperm rheotaxis behavior to separate motile sperm in low shear rate regions.
• Micropocket geometries mimicking the fallopian tube create protected zones for sperm separation.

Main Results:

• The device successfully isolated viable and highly motile sperm from human samples.
• Sperm separation was based on their natural rheotaxis responses to fluid flow.
• Achieved a 100% separation efficiency, demonstrating high efficacy.

Conclusions:

• The biomimicry microfluidic device offers an effective, automated alternative for sperm selection.
• This method mimics natural selection processes, potentially improving assisted reproduction outcomes.
• The technology shows promise for enhancing sperm selection in clinical settings.