Radial Microfluidic Substrate for Rare Cell Capture
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current methods for detecting rare cells, such as circulating tumor cells, are limited by low yield and low purity due to the use of complex and inefficient devices with large three-dimensional structures that obstruct blood flow and lack sensitivity.
Innovation Solution
A microfluidic device with a silicon substrate and metal extensions arranged radially to form a channel, where functionalized graphene oxide is disposed on the extensions to capture rare cells as they interact with the fluid, enhancing sensitivity and capture efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If large three-dimensional structures are used for capturing CTCs, then the device can provide structural support for cell capture, but the structures act as obstacles to blood flow thereby decreasing device efficiency
Solution Approach 1:
The patent transitions from large three-dimensional structures to two-dimensional planar extensions with radial geometry. The extensions are arranged in a radial pattern around a central flow channel, allowing blood to flow through the center while extensions capture cells at the periphery. This dimensional change eliminates flow obstruction while maintaining capture functionality.
Solution Approach 2:
The device divides the capture function into multiple separate radial extensions rather than using a single large three-dimensional structure. Each extension is a discrete element that can be independently optimized, and their radial arrangement distributes the capture function across multiple zones without creating flow bottlenecks.
2Adaptability or versatility
If complex analytic approaches are used for isolating CTCs, then the device can provide multiple functions for cell isolation, but the approaches result in low yield and low purity
Solution Approach 1:
The patent applies functionalized graphene oxide specifically on the radial extensions where cell capture is needed, rather than uniformly treating the entire device. This localized functionalization provides high affinity for CTCs at the capture interface while leaving other device regions unaffected, thereby improving purity without requiring complex multi-step isolation protocols.
Solution Approach 2:
The device combines radial extensions with functionalized graphene oxide coating, creating a composite structure that integrates mechanical support (extensions) with high-affinity binding properties (graphene oxide functionalization). This composite approach enhances capture efficiency and purity without adding complex analytical steps.
3Reliability
If large three-dimensional structures are used for CTC capture, then the device can provide sufficient surface area for cell interaction, but the structures are expensive to produce
Solution Approach 1:
The patent replaces three-dimensional structures with two-dimensional radial extensions that provide sufficient surface area through their radial arrangement and extended perimeter, rather than relying on vertical height or volumetric complexity. This reduces manufacturing complexity and cost while maintaining adequate capture surface area.
Solution Approach 2:
The functionalized graphene oxide coating on the radial extensions provides a high-surface-area material that enhances cell interaction capacity without requiring bulky three-dimensional structures. The graphene oxide layer adds functional surface area at minimal material cost and structural complexity.
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 system significantly improves the detection and capture of rare cells by increasing sensitivity and efficiency, allowing for the identification and isolation of rare cells with higher purity and yield, which can aid in cancer diagnosis and treatment.
Implementation Method 1
capturing the rare cells as the rare cells interact with the functionalized graphene oxide disposed on the plurality of extensions
Data Source
AI summary
This disclosure provides a system for detecting rare cells. The system includes a substrate, extensions extending outwardly from the substrate and arranged about a center axis of the substrate to define a channel enabling the fluid to move radially from the center axis to an outer edge of the substrate, and a functionalized graphene oxide disposed on the extension. This disclosure also provides a method for detecting rare cells using the system of this disclosure. The method includes the steps of introducing a sample of fluid containing the rare cells into the inlet of the system such that the sample of fluid flows radially from the inlet toward the outer edge of the substrate and capturing the rare cells as the rare cells interact with the functionalized graphene oxide disposed on the extensions.