Cell Transfection Tip Assembly with Constriction for High Efficiency
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Solution Overview
Problem
Current methods for introducing genetic material into cells, such as electroporation and viral vectors, face limitations including low efficiency, toxicity, and cell viability issues, particularly for difficult-to-transfect cell types like stem cells and nerve cells, requiring a more efficient and universal approach.
Innovation Solution
A tip assembly with a constriction portion that generates increased fluid velocity and decreased pressure, creating membrane pores for efficient introduction of genetic material into cells, using a combination of a channel and constriction portion with specific geometries and materials, including glass, metal, or polymer, to enhance cell membrane pore formation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If electroporation or viral vectors are used to introduce genetic material into cells, then genetic material can be delivered into the cell nucleus or cytoplasm, but transfection efficiency is low and cell viability is reduced
Solution Approach 1:
The patent replaces mechanical methods (electroporation, microinjection) and chemical methods (viral vectors, lipofection) with a fluid dynamic system. Cells are suspended in fluid and passed through a constriction portion at controlled flow rates, using fluid pressure and velocity to facilitate genetic material uptake without mechanical puncture or chemical toxicity.
Solution Approach 2:
The patent controls transfection efficiency by adjusting fluid flow parameters including flow rate, pressure differential, and constriction geometry. By varying these parameters, the system optimizes the balance between genetic material delivery efficiency and cell viability, achieving high transfection without the toxicity of conventional methods.
2Adaptability or versatility
If conventional transfection methods are used, then some genetic material is introduced into cells, but the method is not effective for difficult-to-transfect cell types such as stem cells, nerve cells, and muscle cells
Solution Approach 1:
The patent creates a universal transfection system that works across diverse cell types including stem cells, nerve cells, muscle cells, and primary cells. The fluid dynamic approach through the constriction portion provides a mechanism that overcomes the membrane barriers of difficult-to-transfect cells without requiring cell-type-specific optimization, achieving broad applicability and high efficiency simultaneously.
3Productivity
If high pressure is applied to introduce genetic material into cells, then transfection efficiency increases, but cell injury and death increase
Solution Approach 1:
The patent applies pressure differentially: high pressure is applied only at the constriction portion where cells pass through, while the rest of the cell suspension remains at lower pressure. This localized high-pressure application facilitates genetic material uptake at the critical interface without subjecting the entire cell population to damaging high-pressure conditions, thereby maintaining cell viability.
4Reliability
If viral vectors are used for transfection, then genetic material can be introduced into cells, but the process is time-consuming and requires biohazard level 2 conditions
Solution Approach 1:
The patent replaces biological viral vectors with a purely physical fluid dynamic system. This eliminates the time delay associated with viral infection and protein expression, allowing direct introduction of genetic material into cells. The system also eliminates the need for biohazard level 2 conditions, enabling faster, safer transfection procedures.
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 method achieves high transfection efficiency and cell viability, allowing for rapid protein expression in various cell types, including those previously difficult to transfect, without the need for viruses or toxic chemicals, and is applicable to both living and non-viable cells.
Implementation Method 1
such that increased fluid velocity and a decreased pressure in the fluid in the constriction portion compared to velocity and pressure in the channel portion enhances formation of membrane pores in the cells
Implementation Method 2
a flow device that generates at least one of a positive pressure and a negative pressure for impelling or directing the fluid
Data Source
AI summary
Methods, tip assemblies and kits are provided for introducing material into cells. The tip assemblies include an attachment portion, a channel portion, and a constriction that function to reduce fluid pressure as a fluid passes through the constriction portion from the channel portion, whereby the tip assemblies form pores in the membranes of cells and introduce material into the cells. The material includes for example one selected from the group of: an inorganic compound, a drug, a genetic material, a protein, a carbohydrate, a synthetic polymer, and a pharmaceutical composition.