[Design and Optimization of Microfluidic Chips Used for Mixing Cryoprotectants]

Area of Science:

• Biotechnology and Biomedical Engineering
• Reproductive Biology
• Microfluidics

Background:

• Traditional cryoprotectant (CPA) methods for oocytes risk osmotic damage and chemical toxicity.
• Microfluidic technology offers a potential solution for controlled and efficient CPA delivery.
• Continuous loading/unloading of CPA is crucial for preserving oocyte viability.

Purpose of the Study:

• To fabricate and evaluate Y-shape microfluidic chips for continuous CPA loading/unloading in oocytes.
• To quantitatively analyze the impact of microchannel design parameters on mixing efficiency.
• To provide insights for optimizing microfluidic chip design in cryopreservation applications.

Main Methods:

• Fabrication of five distinct Y-shape microfluidic chip designs.
• Quantitative analysis of microchannel parameters: flow rate, entrance angle, aspect ratio, and turning radius.
• Evaluation of mixing efficiency and velocity under varying conditions.

Main Results:

• Decreased flow rates, increased aspect ratios, and reduced turning radii significantly enhanced mixing efficiency and velocity.
• The entrance angle of microchannels showed minimal impact on mixing performance.
• Optimal chip parameters depend on balancing CPA loading/unloading time with machining precision.

Conclusions:

• Microfluidic chips can effectively facilitate continuous CPA exchange for oocytes, reducing damage.
• Specific microchannel geometries and flow conditions can be optimized to improve CPA mixing.
• This study provides a valuable reference for applying microfluidic chips in CPA mixing for reproductive technologies.