Electrostatic Needle Actuator for Precise Cell Injection
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Solution Overview
Problem
Conventional biological cell injection methods using microneedles or nanoneedles are inefficient and costly, requiring improved control and calibration for precise delivery of agents to cells, especially when dealing with multiple cells simultaneously.
Innovation Solution
A method involving an electrostatically actuated needle system with a tower and stage, where calibration data is used to detect needle penetration into cells, allowing for precise control and calibration of needle movement using voltage and displacement monitoring, and a system with cameras for alignment and proximity monitoring.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional MEMS devices are used for cell injection, then manufacturing precision is achieved, but device complexity and cost increase
Solution Approach 1:
The device is segmented into independent actuators, each with its own tower-stage-needle assembly, allowing parallel operation while maintaining simplicity of individual components. This segmentation enables manufacturing precision through standardized modules without requiring complex integrated systems.
Solution Approach 2:
The patent uses voltage parameter changes to control needle position and injection depth. By varying the electrostatic potential applied to the tower-stage system, precise control is achieved without complex mechanical positioning mechanisms, reducing device complexity while maintaining manufacturing precision.
2Productivity
If parallel array of actuators is used, then productivity is improved, but control complexity increases
Solution Approach 1:
Each actuator in the parallel array is designed as a universal module capable of independent cell injection. The standardized tower-stage-needle design allows any actuator to perform any injection task, simplifying control by treating all actuators identically while maximizing productivity through parallel operation.
Solution Approach 2:
The calibration system uses self-service principles where the device calibrates itself by detecting needle penetration events and automatically adjusting voltage parameters. This self-calibration capability reduces control complexity by eliminating the need for external calibration procedures for each actuator in the parallel array.
3Measurement precision
If calibration data is used for needle penetration detection, then measurement precision is improved, but loss of time during calibration occurs
Solution Approach 1:
Calibration data is collected and stored in advance for different cell types, creating a lookup library that enables rapid identification without real-time calibration. This preliminary action allows the system to achieve high measurement precision by matching observed voltage-displacement curves against pre-characterized cell types, eliminating time-consuming calibration procedures.
Solution Approach 2:
The system creates copies of calibration characteristics for different cell types and stores them as reference patterns. During operation, the system compares real-time measurements against these copied reference patterns to rapidly identify cell types and adjust injection parameters, achieving high precision without time loss.
4Measurement precision
If voltage monitoring is used to detect cell piercing, then measurement precision is improved, but use of energy increases
Solution Approach 1:
The system uses feedback from voltage monitoring to detect cell piercing events and automatically adjusts injection parameters. By continuously monitoring the voltage-displacement relationship and comparing it against calibration data, the system achieves high measurement precision while minimizing energy use by only actively monitoring during critical injection phases rather than continuously.
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
Enables cost-effective and high-throughput biological cell injection operations by ensuring precise needle control and calibration, improving the efficiency of agent delivery to individual cells within a parallel array of cells.
Implementation Method 1
applying an electrostatic potential between the tower and the stage to retract the needle
Implementation Method 2
a laser interferometer is used to indicate that the needle has pierced the cell
Data Source
AI summary
A method of controlling a needle actuator to interact with a cell is provided, the method comprising: providing an actuator comprising a tower, a stage and a needle, wherein the needle is mounted on the stage; applying an electrostatic potential between the tower and the stage to retract the needle; moving the actuator towards the cell; reducing the potential so as to allow the stage and needle to move towards the cell; applying calibration data to detect when the needle has pierced the cell; and reducing the potential further once it has been detected that the needle has pierced the cell. The cell can be a biological cell. The needle can be a micro-needle and the stage can be a micro-stage.