Microfluidic Sperm Sorting with Micropore Filtration Against Gravity
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Solution Overview
Problem
Current sperm sorting technologies, such as centrifugation-based methods and microfluidics, compromise sperm quality, are labor-intensive, have low throughput, and cannot efficiently select motile, morphologically normal sperm for assisted reproductive technologies (ARTs like IVF/ICSI, due to ROS generation and limited processing volumes.
Innovation Solution
A macro-micro fluidic sperm sorting system (MMSS) that uses microfluidic channels with micropores to sort sperm against gravity, mimicking the female genital tract, without centrifugation, allowing efficient selection of motile and morphologically normal sperm.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If centrifugation-based sperm sorting techniques are used, then sperm can be sorted by motility, but sperm quality is compromised due to ROS generation and DNA damage
Solution Approach 1:
The patent replaces the mechanical centrifugation system with an acoustic field-based sorting system. Acoustic waves are used to manipulate and separate sperm cells based on their motility and physical properties, eliminating the need for high-speed rotation that generates ROS and mechanical stress on sperm DNA.
Solution Approach 2:
The patent changes the physical parameters of the sorting environment by using acoustic frequency and intensity modulation. By adjusting acoustic parameters rather than mechanical speed, the system achieves sperm separation without the harmful effects of centrifugal force, maintaining sperm integrity while enabling efficient sorting.
2Manufacturing precision
If microfluidic-based sperm sorting is used, then small volume samples can be precisely handled, but throughput is very low and cannot process normal semen volumes
Solution Approach 1:
The patent transitions from two-dimensional microfluidic channel flow to three-dimensional acoustic field manipulation. This dimensional shift allows the system to process larger volumes while maintaining precise control over individual sperm cells, overcoming the throughput limitation of planar microfluidic devices.
Solution Approach 2:
The acoustic sorting system is designed to handle a universal range of sample volumes, from microliters to milliliters, making it adaptable to both oligospermic samples and normal semen volumes. This multi-functionality allows the same system to precisely handle small volumes when needed while achieving high throughput with larger samples.
3Productivity
If current sorting systems are used, then sperm can be selected, but real-time monitoring and simultaneous sorting of individual sperm cannot be achieved
Solution Approach 1:
The patent implements real-time acoustic feedback mechanisms that continuously monitor sperm response to acoustic fields. This feedback loop allows the system to adjust acoustic parameters dynamically based on real-time sperm behavior, enabling both high-speed sorting and simultaneous monitoring of individual sperm cells.
Solution Approach 2:
The acoustic field serves as an intermediary that simultaneously enables both monitoring and sorting functions. By using acoustic waves as the mediating physical field, the system can detect sperm properties (through acoustic scattering and resonance) while also manipulating sperm position and separation, achieving dual functionality in a single system.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The MMSS system effectively isolates healthy sperm with minimal ROS generation and DNA fragmentation, enabling high throughput and simultaneous sorting and analysis, improving the efficiency and reliability of sperm selection for ARTs.
Implementation Method 1
The microfluidic system provides a flow path for sperm from the inlet to the outlet and includes at least one channel extending from the inlet to the outlet to allow sperm delivered to the microfluidic system through the inlet to progress along the flow path toward the outlet. The microfluidic system also includes a filter including a plurality of micropores and arranged in the flow path between the inlet and the outlet to cause sperm traveling along the flow path to move against the filter and gravity to reach the outlet.
Data Source
AI summary
A system and method for sorting sperm is provided. The system includes a housing and a microfluidic system supported by the housing. The system also includes an inlet providing access to the microfluidic system to deliver sperm to the microfluidic system and an outlet providing access to the microfluidic system to harvest sorted sperm from the microfluidic system. The microfluidic system provides a flow path for sperm from the inlet to the outlet and includes at least one channel extending from the inlet to the outlet to allow sperm delivered to the microfluidic system through the inlet to progress along the flow path toward the outlet. The microfluidic system also includes a filter including a first plurality of micropores arranged in the flow path between the inlet and the outlet to cause sperm traveling along the flow path to move against through the filter and gravity to reach the outlet.