Microfluidic Manifold with Polymer Substrate for Bubble-Free Fluid Delivery
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Solution Overview
Problem
Microfluidic devices face challenges in providing fluid and electrical connections at the micron-scale, leading to issues like trapped bubbles and increased costs due to the size of silicon dies required for fluid routing and distribution, as well as potential leaks and erratic performance from fluid interaction with non-surface layers.
Innovation Solution
A composite structure is molded with a microfluidic die integrated into a polymer substrate, eliminating gaps between the die and substrate, and a separate fluid manifold is attached to deliver fluid directly to the die, ensuring a gap-free interface and reducing the risk of leaks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If fluid routing and distribution is integrated into the silicon die, then fluid delivery is enabled, but the die size increases and cost increases non-linearly
Solution Approach 1:
The device is divided into separate functional components: a silicon die containing the microfluidic device, a polymer substrate providing structural support and fluid access, and a manifold for fluid distribution. This segmentation allows each component to be optimized independently, reducing the silicon die area while maintaining fluid delivery capability.
Solution Approach 2:
Fluid routing is moved from the two-dimensional silicon die surface to a three-dimensional composite structure where the polymer substrate and manifold provide additional spatial dimensions for fluid access and distribution, eliminating the need for large integrated fluidic channels in the die.
2Productivity
If fluid connections are provided at the micron-scale, then device miniaturization is achieved, but trapped bubbles and connection reliability issues occur
Solution Approach 1:
The polymer substrate acts as an intermediary between the micron-scale silicon die and the macro-scale manifold, providing a transition zone that facilitates reliable fluid connections while maintaining miniaturization benefits. The substrate's larger feature sizes reduce bubble trapping compared to direct micron-scale connections.
3Area of stationary object
If the die is mounted in packaging with recesses, then smaller die can be used, but fluid interaction with non-surface layers causes leaks and erratic performance
Solution Approach 1:
The problematic packaging recesses are eliminated by directly bonding the silicon die to the polymer substrate surface. This extraction of the die from the packaging cavity removes the risk of fluid interaction with non-surface layers, ensuring stable fluidic connections while maintaining compact size.
Data Source
AI summary
A device includes: a die including a microfluidic device; a polymer substrate formed around the die; and a separate fluid manifold attached to the polymer substrate over the die and on a same side of the substrate as the die, the manifold to deliver fluid to the die.