Microfluidic Sperm Sorting via Parallel Channels
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Solution Overview
Problem
Current sperm sorting techniques, such as jet-in-air flow cytometers, face limitations in throughput and efficiency due to mechanical stress, high laser power, and shear forces, leading to lower pregnancy and birth rates in sex-sorted artificial insemination, particularly in equine and porcine species, where larger sperm doses are required.
Innovation Solution
A microfluidic chip system with multiple parallel flow channels that gently sorts sperm using a coaxial flow, fluid focusing, and orienting regions, combined with electromagnetic radiation for characterization and a diverting mechanism to selectively collect viable X- or Y-chromosome bearing sperm, reducing mechanical stress and increasing sorting efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If jet-in-air flow cytometry is used for sperm sorting, then sperm can be sorted by sex chromosome, but the throughput is limited and AI doses must be smaller
Solution Approach 1:
The system divides the sorting process into multiple parallel flow channels (e.g., 8 channels) that operate simultaneously. Each channel independently sorts sperm based on fluorescence characteristics, enabling parallel processing and significantly increasing overall throughput while maintaining the ability to collect large quantities of sorted sperm.
Solution Approach 2:
The invention transitions from single-channel sequential sorting to multi-channel parallel sorting, adding a spatial dimension to the sorting process. This dimensional expansion allows multiple sperm populations to be sorted simultaneously, directly addressing the throughput limitation.
2Speed
If jet-in-air flow cytometry with high velocity is used, then sorting speed increases, but mechanical stress and shear forces injure sperm
Solution Approach 1:
The system replaces the high-velocity jet-in-air mechanical sorting mechanism with a gentler microfluidic flow system. Sperm are sorted at lower velocities using controlled fluid dynamics in narrow channels, eliminating the damaging shear forces and mechanical stress while maintaining sorting functionality through fluorescence-activated diversion.
Solution Approach 2:
The invention fundamentally changes the velocity parameter from high speed (15-20 m/s in jet-in-air) to low speed microfluidic flow. This parameter change reduces mechanical stress and shear forces to non-damaging levels while preserving the sorting capability through alternative detection and diversion mechanisms.
3Measurement precision
If high laser power is used for illumination, then sperm characteristics can be measured at high velocity, but sperm are exposed to higher energy levels that may cause damage
Solution Approach 1:
The system changes the illumination parameters by using lower power lasers combined with extended observation time in microfluidic channels. The slower flow velocity allows sperm to remain in the detection zone longer, compensating for reduced laser power while minimizing energy exposure and potential damage to the delicate sperm cells.
4Productivity
If longer sorting time is used to process large numbers of sperm, then throughput increases, but sperm deteriorate over time
Solution Approach 1:
The system processes large numbers of sperm rapidly by dividing the workload across multiple parallel channels. This segmentation enables high throughput without extending the sorting time for individual sperm, maintaining viability while achieving the necessary throughput for large AI doses.
Solution Approach 2:
The microfluidic system maintains continuous, gentle flow of sperm through the sorting channels, ensuring uninterrupted processing at optimal conditions. This continuous action allows rapid sorting of large populations without the intermittent delays or extended exposure times that would compromise sperm viability.
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 system achieves higher throughput and gentler sorting conditions, enabling the collection of larger sperm doses with improved viability and orientation, thereby enhancing pregnancy and birth rates in sex-sorted artificial insemination.
Implementation Method 1
An electromagnetic radiation source may be configured for illuminating sperm in the at least one flow channel at the inspection region and a detector may be aligned to measure sperm characteristics
Data Source
AI summary
This disclosure relates to a system for sorting sperm cells in a microfluidic chip. In particular, various features are incorporated into the system for aligning and orienting sperm in flow channels, as well as, for determining sperm orientation and measuring relative DNA content for analysis and/or sorting.