Capillary Flow Cytometry Light Collection Efficiency
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Solution Overview
Problem
Capillary-based flow cytometry faces a trade-off between light collection efficiency and resolution due to the quadratic dependence of sensitivity on numerical aperture, limiting achievable sensitivity and throughput while increasing construction costs.
Innovation Solution
The integration of micro lenses with capillaries and the use of dual-sided light collection and detection configurations, which collect light from both sides of the capillary and sum the signals, reduces the dependence on particle position within the capillary, thereby enhancing collection efficiency without compromising resolution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If high NA optics are used to increase light collection efficiency, then collection efficiency improves, but resolution deteriorates due to increased sensitivity to particle position
Solution Approach 1:
The capillary is divided into multiple interrogation regions along its length, with each region having its own dedicated detector. This segmentation allows the system to collect light from multiple positions simultaneously, effectively increasing collection efficiency without compromising resolution, as each segment maintains its own measurement precision while the aggregate system achieves higher throughput.
Solution Approach 2:
The patent transitions from single-point detection to distributed detection along the capillary length (adding a spatial dimension). By placing multiple detectors at different positions along the capillary, the system collects light from multiple interrogation regions simultaneously, resolving the contradiction between collection efficiency and resolution by operating in multiple spatial dimensions rather than relying on a single high-NA optical path.
2Reliability
If conventional single-sided detection is used, then device complexity is low, but light collection efficiency is limited to about 10 percent
Solution Approach 1:
The detection system is segmented into multiple independent detection channels, each with its own detector and optical path. This segmentation distributes the detection function across multiple simpler units rather than requiring a single complex high-NA optical system, thereby increasing overall collection efficiency while keeping individual detector units relatively simple and manageable.
Solution Approach 2:
Multiple detection channels are merged into a unified data processing system. The patent combines signals from multiple detectors along the capillary, effectively merging their collection capabilities to achieve high overall efficiency (at least 30%) while maintaining the simplicity of individual detection units. This merging approach allows the system to benefit from cumulative collection efficiency without requiring each component to be overly complex.
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
This approach increases light collection efficiency to at least 30%, significantly improving sensitivity and throughput while allowing the use of less expensive, lower sensitivity detectors, thus reducing instrument construction costs without sacrificing resolution.
Implementation Method 1
The integration of micro lenses with capillaries and the use of dual-sided light collection and detection configurations, which collect light from both sides of the capillary
Data Source
AI summary
In a particle analyzing apparatus including a capillary for passing through a fluid containing particles to be analyzed, an optical system is employed to collect fluorescent light emitted from particles or substances labeled to the particles with improved collection efficiency preserving resolution of the instrument. The optical system may include a first collection lens attached to the capillary and a first reflection element arranged adjacent to the first collection lens configured to reflect fluorescent light of one or more wavelengths. The optical system may include a second collection lens attached to the capillary and a second reflection element arranged adjacent to the second collection lens configured to reflect fluorescent light of one or more wavelengths.