Microcapillary Cell Recovery Using Closed-Loop Liquid Transfer
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Solution Overview
Problem
Current methods for recovering viable biological cells from microcapillary arrays, particularly mammalian cells, suffer from high sample loss and loss of viability due to open system designs and methods like laser-based extraction or air pressure, which are unsuitable for clinical applications requiring sterility and integrity.
Innovation Solution
A method using aligned recovery nozzles above and below microcapillaries in an array, allowing liquid flow to transfer the sample contents without loss, maintaining a closed system for sterility and viability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If laser-based extraction or air pressure methods are used to recover cells from microcapillary arrays, then cell retrieval is achieved, but sample loss and loss of viability occur due to open system designs
Solution Approach 1:
A liquid intermediary medium is introduced to transfer cells from the microcapillary to the collection vessel. The liquid medium acts as a carrier that maintains cells in suspension during transfer, preventing direct contact with air interfaces and eliminating the need for evaporation or drying steps that cause cell death and sample loss.
Solution Approach 2:
The system maintains a closed liquid environment throughout the cell recovery process, creating an inert atmosphere that protects cells from exposure to air. This eliminates oxidative stress and mechanical disruption caused by air pressure methods, thereby preserving cell viability and preventing sample loss.
2Reliability
If open system designs are used for cell recovery, then simplicity of operation is maintained, but sterility and integrity are compromised for clinical applications
Solution Approach 1:
The system employs a closed liquid-phase environment that maintains sterility throughout the cell recovery process. By eliminating open air interfaces and using liquid as the primary medium for cell transfer, the system prevents contamination while maintaining operational simplicity through automated liquid handling.
Solution Approach 2:
The invention replaces mechanical cell ejection methods (air pressure, laser ablation) with a liquid flow-based transport system. This substitution eliminates the need for complex mechanical disruption of the microcapillary seal while maintaining ease of operation through controlled liquid flow rates and automated positioning.
3Productivity
If laser ablation or air pressure methods are used, then cell extraction speed is improved, but cell viability decreases due to membrane disruption
Solution Approach 1:
The system uses hydraulic pressure applied to the liquid medium to drive cell extraction from the microcapillary. This gentle pressure gradient method maintains cell integrity by avoiding the mechanical disruption caused by air pressure or laser ablation, while still achieving rapid extraction speeds through controlled fluid flow.
Solution Approach 2:
The invention replaces direct mechanical cell ejection methods with a liquid flow-based transport system. The liquid medium carries cells through the microcapillary exit and into the collection vessel, eliminating the need for laser ablation or air pressure that cause membrane disruption, thereby maintaining high cell viability.
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
Ensures complete recovery of biological cells with high viability by minimizing evaporation and maintaining a closed system, suitable for clinical applications like cell therapy manufacturing.
Implementation Method 1
flowing liquid from a first recovery nozzle through a microcapillary of the array and into a second recovery nozzle
Data Source
AI summary
A method of recovering the contents from a microcapillary array having a plurality of wells each with mutually opposed first and second openings. The method comprises: a) identifying a target well of the array for recovery from among a plurality of wells of the array; b) bringing first and second recovery ducts into contact with the array in alignment respectively with the first and second openings of the identified target well to effect fluid communication between those ducts and that well through the respective first and second openings; and c) by flowing fluid from the first recovery duct through the identified target well and into the second recovery duct, conveying contents of that well into the second recovery duct.