Microfluidic Constriction for Intracellular Delivery
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Solution Overview
Problem
Current methods for delivering molecules into eukaryotic cells, such as pharmaceuticals and therapeutics, face challenges in achieving robust and precise delivery, especially for difficult-to-deliver cell types like stem cells and immune cells, often resulting in low viability and inefficient uptake.
Innovation Solution
A microfluidic platform that uses controlled mechanical deformation, such as constriction or high shear rates, to facilitate direct intracellular delivery of molecules into eukaryotic cells, avoiding the need for vectors and minimizing cell damage, with a device design that includes channels with constrictions tailored to cell size for efficient and viable delivery.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If established methods use chemicals or electrical pulses to breach the membrane and deliver material into the cytoplasm, then delivery efficiency is improved, but cell viability deteriorates
Solution Approach 1:
The patent replaces chemical and electrical methods with a mechanical microfluidic system that uses controlled shear stress and pressure gradients to deliver molecules into cells. The microfluidic device creates a pressure gradient that forces cells through a constriction point, applying controlled mechanical stress to temporarily breach the membrane and enable cytoplasmic delivery while maintaining cell viability through precise parameter control.
Solution Approach 2:
The patent employs parameter changes by controlling flow rate, pressure gradient, and constriction geometry to optimize the balance between membrane breach efficiency and cell survival. By adjusting these parameters, the system achieves effective molecule delivery while minimizing cell damage, resolving the contradiction between delivery efficiency and cell viability.
2Productivity
If existing methods are used to deliver molecules into cells, then delivery capability is improved, but method complexity and specificity increase
Solution Approach 1:
The patent creates a universal microfluidic platform that can deliver various types of molecules (proteins, nucleic acids, nanoparticles) into different cell types using a single standardized device design. The system eliminates the need for method development for each specific application by providing a general-purpose delivery platform with adjustable parameters that work across multiple delivery scenarios.
Solution Approach 2:
The patent segments the delivery process into distinct functional zones within the microfluidic device: a loading zone, a constriction zone for membrane breach, and a recovery zone. This segmentation allows each zone to be optimized independently while maintaining overall system simplicity and ease of operation.
3Productivity
If high shear rates are applied to deliver molecules into cells, then delivery efficiency is improved, but cell viability deteriorates
Solution Approach 1:
The patent uses periodic action by applying high shear stress only during the brief moment cells pass through the constriction point, followed by immediate recovery in a low-stress environment. This transient application of high shear rate achieves effective membrane breach and molecule delivery while limiting cumulative cell damage, as cells are exposed to high stress for only microseconds at a time.
Solution Approach 2:
The patent applies the skipping principle by having cells rapidly pass through the high-shear constriction zone without prolonged exposure. The cells are accelerated through the constriction point and immediately into a recovery zone, minimizing the duration of harmful high-shear exposure while maintaining delivery efficiency. This rushed passage through the danger zone achieves the goal without sustained harmful effects.
4Productivity
If molecules are delivered into cells using conventional methods, then delivery is achieved, but endosomal sequestration occurs
Solution Approach 1:
The patent extracts the harmful endosomal sequestration step from the delivery process by directly depositing molecules into the cytoplasm through mechanically breached membrane pores. The microfluidic constriction creates temporary membrane openings that allow molecules to bypass the endocytic pathway entirely and enter the cytoplasm directly, eliminating endosomal trapping and ensuring payload integrity and functionality.
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
This method achieves high throughput and viability of cells, with up to 90% viability and efficient delivery of molecules into the cytosol, avoiding endosomal sequestration and preserving the integrity of sensitive payloads like proteins and nanoparticles, while enabling precise control over delivery conditions.
Implementation Method 1
controlled mechanical deformation, such as constriction or high shear rates, to facilitate direct intracellular delivery
Implementation Method 2
subjecting a cell to a constriction, rapid stretching, rapid compression, or pulse of high shear rate
Implementation Method 3
The uptake of molecule is diffusion-based rather than endocytosis
Data Source
AI summary
A microfluidic system for causing perturbations in a cell membrane, the system including a microfluidic channel defining a lumen and being configured such that a cell suspended in a buffer can pass therethrough, wherein the microfluidic channel includes a cell-deforming constriction, wherein a diameter of the constriction is a function of the diameter of the cell.