Microfluidic Tissue Digestion via Hydrodynamic Shear and Sieve Channels
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Solution Overview
Problem
Current microfluidic devices face limitations in efficiently processing and dissociating large tissue specimens into cellular suspensions, often resulting in low cell yields and clogging issues, and are not capable of handling samples larger than 1 mm in size without prior mincing or enzymatic digestion.
Innovation Solution
A microfluidic device with a substrate having an inlet, outlet, and sample chamber, featuring upstream hydro-mincing microfluidic channels that apply hydrodynamic shear forces and downstream sieve channels to break down tissue into cellular suspensions, allowing for the processing of larger tissue samples without manual mincing, and optionally incorporating valves for targeted shear application and cell sorting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If traditional microfluidic devices are used to process tissue samples, then device complexity is reduced, but cell yield and processing efficiency deteriorate due to clogging issues and inability to handle large samples
Solution Approach 1:
The device channels are segmented into three distinct functional zones: hydro-mincing channels for mechanical disruption, enzymatic digestion channels for chemical breakdown, and sieve channels for filtration. This segmentation allows each zone to perform its specific function optimally without interference, resolving the contradiction by enabling high cell yield through specialized structures rather than a simple uniform design
Solution Approach 2:
The patent transitions from traditional 2D microfluidic channels to a 3D multi-layered architecture with vertical stacking of functional channels. This dimensional change allows simultaneous processing of large tissue samples while maintaining controlled fluid dynamics, achieving high productivity without excessive device complexity through spatial optimization
2Loss of time
If larger tissue samples are processed without prior mincing, then sample preparation time is reduced, but device reliability deteriorates due to clogging in traditional microfluidic channels
Solution Approach 1:
The hydro-mincing channels perform preliminary mechanical disruption of large tissue samples into smaller fragments before they enter the main processing channels. This preliminary action prevents clogging in subsequent channels while eliminating the need for external mincing steps, thereby improving both time efficiency and operational reliability
Solution Approach 2:
The device introduces enzymatic digestion as an intermediary process between mechanical hydro-mincing and final cell release. This intermediary chemical breakdown softens tissue structures, preventing clogging while maintaining reliability, and eliminates the need for manual mincing to achieve reliable operation
3Productivity
If mechanical cutting is used to process tissue, then tissue breakdown is achieved, but cell viability deteriorates due to harsh mechanical forces
Solution Approach 1:
The patent replaces harsh mechanical cutting with a combined hydrodynamic mincing and enzymatic digestion system. The hydro-mincing uses controlled fluid shear forces rather than direct mechanical contact, and enzymatic digestion chemically breaks down tissue matrices, thereby achieving efficient dissociation while minimizing mechanical damage to cell viability
Solution Approach 2:
The device changes the physical parameters of fluid flow to create optimized shear stress conditions in hydro-mincing channels. By controlling flow rate, channel geometry, and pressure gradients, the system achieves effective tissue breakdown while maintaining shear forces below thresholds that would damage cell viability, resolving the contradiction between dissociation efficiency and cell health
4Object-affected harmful factors
If enzyme digestion is performed without mechanical disruption, then cell viability is maintained, but processing efficiency deteriorates due to low cell yields
Solution Approach 1:
The device merges hydrodynamic mechanical mincing with enzymatic digestion in an integrated flow path. The hydro-mincing channels physically fragment tissue while enzymatic channels simultaneously chemically break down matrices, creating a synergistic effect that achieves high cell yields while maintaining viability through controlled, gentle processing conditions
Solution Approach 2:
The device establishes continuous flow through all channel zones, maintaining constant enzymatic contact with tissue fragments throughout the digestion process. This continuous action ensures complete breakdown of tissue matrices without stopping for manual intervention, achieving high productivity while the gentle continuous enzymatic action preserves cell 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 device effectively processes tissue samples of various sizes, achieving higher cell yields and viability compared to traditional methods, with improved enzyme penetration and mechanical dissociation, capable of handling larger samples without prior mincing, and facilitating downstream cell sorting and analysis.
Implementation Method 1
upstream hydro-mincing microfluidic channels that drive the fluid into discrete locations of the tissue in a jetting process, effectively mincing it through the application of hydrodynamic shear forces
Implementation Method 2
flowing a fluid containing a digestive enzyme into the inlet
Implementation Method 3
downstream sieve microfluidic channels that act as a sieve that firmly holds the tissue in place while also allowing smaller aggregates and cells to exit the sample chamber
Data Source
AI summary
A microfluidic device uses hydrodynamic shear forces on a sample to improve the speed and efficiency of tissue digestion is disclosed. The microfluidic channels are designed to apply hydrodynamic shear forces at discrete locations on tissue specimens up to 1 cm in length and 1 mm in diameter, thereby accelerating digestion through hydrodynamic shear forces and improved enzyme-tissue contact. Experiments using animal organs show that the digestion device with hydro-mincing capabilities is superior to conventional scalpel mincing and digestion based on recovery of DNA and viable single cells. The microfluidic digestion device can eliminate or reduce the need to mince tissue samples with a scalpel, while reducing sample processing time and preserving cell viability. Another advantage is that downstream microfluidic operations could be integrated to enable advanced cell processing and analysis capabilities. The device may be used in research and clinical settings to promote single cell-based analysis technologies, as well as to isolate primary, progenitor, and stem cells for use in the fields of tissue engineering and regenerative medicine.