Carbon Nanotube Arrays for Intracellular Biomolecule Delivery
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Solution Overview
Problem
Conventional methods for intracellular delivery of biomolecules, such as lipofection, electroporation, viral vectors, and biolistics, face limitations including high toxicity, low efficiency, and physical damage to cells, particularly for post-mitotic cells and stem cells, and require complex and costly equipment, making them unsuitable for large-scale or multiple injections.
Innovation Solution
A carbon nanotube array comprising hollow carbon nanotubes arranged on a base with specific dimensions and spacing, allowing for efficient and minimally invasive delivery of biomolecules to cells without distorting cellular membranes, enabling post-injection processing and handling of target cells.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional methods (lipofection, electroporation, viral vectors) are used for intracellular delivery, then biomolecules can be delivered into cells, but cellular toxicity is high and transfection efficiency is low
Solution Approach 1:
The patent uses carbon nanotubes as intermediary structures to deliver biomolecules into cells. The nanotubes serve as physical conduits that penetrate cell membranes, allowing direct delivery of genetic material without relying on toxic chemical or viral vectors. This intermediary approach enables controlled transfection with minimal cellular damage.
Solution Approach 2:
The invention replaces chemical and biological delivery mechanisms (lipofection reagents, viral vectors) with a purely physical mechanical system - carbon nanotube arrays that physically penetrate and deliver cargo into cells. This mechanical substitution eliminates the need for toxic chemical agents while maintaining delivery efficiency.
2Productivity
If single-tipped nanodevices are used for intracellular delivery, then some cells can be targeted, but the process is time-consuming and transfection rate is low due to serial approach
Solution Approach 1:
The invention divides a single delivery tip into multiple nanotubes arranged in arrays, allowing parallel delivery to multiple cells simultaneously. This segmentation transforms a serial single-tip process into a parallel multi-tip system, dramatically increasing transfection rates and reducing the time required to treat cell populations.
Solution Approach 2:
The patent merges multiple nanotube delivery channels into a single integrated array structure that can be applied to cells collectively. By combining multiple delivery pathways into one unified device, the system achieves high-throughput transfection without requiring separate operations for each cell.
3Quantity of substance
If nanotubes are used for intracellular delivery, then transfer load can be increased, but cellular membranes are distorted and subsequent removal of target cells is inhibited
Solution Approach 1:
The invention optimizes critical parameters of the nanotubes including diameter (50-500 nm), length, spacing, and array density to achieve the right balance between delivery capacity and membrane preservation. By carefully controlling these parameters, the system enables high transfer loads while maintaining cellular membrane integrity and allowing post-delivery cell recovery.
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 carbon nanotube array achieves high transfer efficiency with low cellular toxicity, supporting cell health and morphology, allowing for precise control of delivery concentration and time, and facilitating multiple injections and post-processing of cells.
Implementation Method 1
a fluid flow passage channel extends between pairs of inlet and outlet ports such that there is a fluidic communication between the first planar surface and the second planar surface of the base via the hollow carbon nanotubes
Data Source
Figure 1~2
Figure 3
Figure 4~5c
AI summary
An apparati and methods relating to carbon nanotube arrays and their use in administering agents to a cell.