Microfluidic Assay Card Reader With Vertical Contact Alignment
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Solution Overview
Problem
Existing point-of-care testing devices are limited by high costs, large footprints, limited test menus, and lack of versatility, making them impractical for widespread use as central lab replacements, and they struggle with precise control of small biological fluid samples in microfluidic channels.
Innovation Solution
A card reading system with vertical actuation and two-step alignment, using island contacts and a moving platform with spring-loaded pin connectors for precise electrical connections, and multiple temperature zones to accommodate variable card thickness and length, preventing buckling and improper insertion, while enabling high-resolution metering and multiplexed testing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If point-of-care testing devices are designed to be portable and simple, then ease of operation is improved, but multiplexing capabilities and testing efficiency deteriorate
Solution Approach 1:
The device divides the testing system into modular components: a reusable card reader and disposable test cards. Each test card is segmented into multiple independent microfluidic channels, allowing parallel testing of multiple analytes. This segmentation enables the device to maintain simplicity and portability while achieving high multiplexing capabilities through the use of multiple discrete testing channels on a single card.
Solution Approach 2:
The card reader is designed as a universal platform that can accommodate different types of test cards with varying numbers of channels and testing configurations. The system uses standardized interfaces and control algorithms that adapt to different card types, allowing a single device to perform multiple testing functions without requiring complex reconfiguration, thus maintaining ease of operation while expanding multiplexing capabilities.
2Productivity
If point-of-care test readers are designed with high throughput capabilities, then productivity is improved, but device footprint and cost increase
Solution Approach 1:
The system transitions from horizontal expansion of device size to vertical integration of functionality. Multiple testing channels are stacked in a compact arrangement within the card format, allowing high throughput testing without increasing the horizontal footprint of the reader. The microfluidic channels are arranged in a space-efficient configuration that maximizes testing capacity within a compact form factor.
Solution Approach 2:
The system uses disposable test cards that contain replicated microfluidic channel structures, each capable of independent testing. Instead of requiring a single complex instrument to handle all testing functions, the system replicates the testing functionality across multiple identical channels on a single card, enabling high throughput through parallel processing while keeping the reader design simple and compact.
3Ease of manufacture
If disposable test cartridges are designed for single-test functionality, then ease of manufacture is improved, but cost per test increases
Solution Approach 1:
The invention merges multiple testing functions into a single disposable card unit. Instead of requiring separate cartridges for each test, the system integrates multiple microfluidic channels, reagent reservoirs, and detection elements into one card that can perform multiple tests simultaneously. This merging reduces the total number of disposable components needed, lowering material costs and simplifying the manufacturing process while maintaining the ease of single-use disposal.
Data Source
AI summary
A card reading system in which electrical contacts between the assay card and the card reader are made through vertical actuation of a card interface relative to the assay card. In one embodiment, the assay card reading system comprises: (a) a card reader comprising at least one card interface, the card interface having a plurality of card interface contacts; (b) an assay card having card contacts; (c) a vertical actuation mechanism for causing relative vertical movement between the assay card and the card interface to contact at least a portion of the card interface contacts with the card contacts.