Thermal Ejection Chambers for Accurate Single-Cell Dispensing
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional cell picking machines for dispensing individual cells into micro-well plates are expensive and time-consuming, necessitating a more efficient and cost-effective solution for automated sample preparation and analysis.
Innovation Solution
A cell dispensing device utilizing a thermal fluid ejection head with cell ejection chambers, thermal cell ejectors, and aspiration channels, enabling precise dispensing of single cells onto analytical substrates using a semiconductor substrate and activation circuits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional cell picking machines with cameras are used to pick single cells, then cell dispensing accuracy is improved, but device cost and complexity increase significantly
Solution Approach 1:
The patent replaces conventional mechanical cell picking machines with a thermal ejection system. Thermal cell ejectors use controlled heating to eject cells from chambers onto substrates, eliminating the need for complex mechanical picking mechanisms and cameras. This substitution of thermal actuation for mechanical manipulation directly reduces device complexity while maintaining cell dispensing accuracy.
Solution Approach 2:
The invention changes the fundamental operating parameter from mechanical force (in conventional pickers) to thermal energy (in this invention). By controlling temperature parameters of the thermal cell ejectors, the system achieves precise cell ejection without requiring complex mechanical positioning and picking mechanisms, thus resolving the contradiction between accuracy and complexity.
2Manufacturing precision
If conventional cell picking machines are used, then cell dispensing accuracy is improved, but processing time increases
Solution Approach 1:
The thermal ejection system enables continuous cell dispensing operation. Multiple cell ejection chambers can be simultaneously heated and emptied in parallel, allowing continuous processing without the sequential pick-place-pick-place cycle required by conventional machines. This parallel processing capability maintains accuracy while significantly reducing total processing time.
Solution Approach 2:
By replacing slow mechanical picking operations with rapid thermal ejection, the system achieves both accuracy and speed. The thermal actuation occurs much faster than mechanical manipulation, enabling high-throughput single-cell dispensing while maintaining precision through controlled thermal parameters rather than complex mechanical positioning.
3Ease of operation
If conventional cell picking machines are used, then cell dispensing capability is achieved, but cost increases significantly
Solution Approach 1:
The patent employs disposable microfabricated cell ejection chambers and substrates that can be easily replaced. This approach eliminates the need for expensive, complex, and maintenance-intensive conventional cell picking machines. The low-cost microfabricated components achieve the same automated cell dispensing function with significantly reduced equipment investment.
Solution Approach 2:
The substitution of expensive mechanical picking systems with simpler thermal ejection devices directly reduces cost. The thermal cell ejectors and microfabricated chambers are much cheaper to manufacture and operate than conventional camera-based picking machines, while still providing automated single-cell dispensing capability.
4Device complexity
If thermal cell ejectors are used, then device cost is reduced, but control precision requirements increase
Solution Approach 1:
The system manages thermal control precision through careful selection of operating parameters. By optimizing heating power, pulse duration, and chamber geometry, the system achieves reliable cell ejection with moderate thermal control precision requirements. This parameter optimization allows cost reduction without sacrificing the increased precision demands of thermal actuation.
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 inexpensive and accurate dispensing of single cells onto analytical substrates, avoiding the need for complex machinery and reducing procedural time.
Implementation Method 1
A thermal cell ejector is disposed on the first semiconductor substrate in each of the cell ejection chambers
Implementation Method 2
A negative pressure is applied to the aspiration port to pull cells in the fluid from the cell ejection nozzle layer through the cell ejection ports into the cell ejection chambers
Data Source
AI summary
A cell dispensing device and method of capturing and dispensing individual cells to an analytical substrate. The device includes a thermal fluid ejection head having a plurality of cell ejection chambers formed in an aspiration channel layer attached to a first semiconductor substrate. A cell ejector is disposed on the first semiconductor substrate in each of the cell ejection chambers, and aspiration channels are formed in the aspiration channel layer in flow communication with at least some of the cell ejection chambers. A cell ejection nozzle layer contains cell ejection ports therein, wherein the cell ejection nozzle layer is attached to the aspiration channel layer. An activation circuit for each cell ejector is provided in the plurality of cell ejection chambers. An aspiration device is provided in fluid flow communication with at least some of the cell ejection chambers through the aspiration channels.