Microfluidic Device Parallel Fluid Delivery and Emptying

The patent transitions from 2-D planar channel layouts to 3-D立体 structures by introducing vertical stacking of processing units and channels. Multiple processing units are arranged in different layers with inter-layer fluidic connections, allowing channels to pass through different z-heights without intersecting in the planar view. This dimensional transition resolves the channel cross-intersection problem while maintaining efficient fluid distribution.

The fluidic system is segmented into multiple independent layers, each containing processing units and associated channels. The fluidic network is divided into separate routing paths in different spatial layers, with inter-layer connections established through vertical channels or ports. This segmentation allows independent optimization of each layer's channel layout without causing cross-intersections, while the hierarchical segmentation of fluid distribution paths prevents air bubble entrapment.

The patent introduces intermediary fluidic elements such as common fluid reservoirs, distribution manifolds, and balancing channels that act as mediators between the fluid source and multiple processing units. These intermediary structures provide centralized control points for fluid distribution and enable synchronized flushing of multiple channels by coordinating fluid delivery through common pathways before branching to individual units.

The patent designs the fluidic network to achieve equipotential flow conditions by creating balanced hydraulic resistance paths to each processing unit. Common fluid distribution channels are positioned and dimensioned to provide equal or controlled flow resistance to all processing units, ensuring that fluids flow synchronously through parallel channels. This equipotential design prevents flow imbalance and reduces air bubble formation by maintaining consistent pressure gradients across all channels during parallel flushing operations.

The patent employs dynamic channel dimensioning where channel cross-sectional areas vary along their length rather than remaining constant. Channels may start with larger dimensions at the inlet to facilitate fluid entry and then taper to smaller dimensions in mid-sections to increase flow resistance and overcome surface effects. The outlet regions may again expand or include enlargement features to facilitate complete fluid expulsion. This dynamic variation in channel geometry allows optimization of different flow stages within the same channel structure.

The patent utilizes changes in channel geometric parameters (width, height, cross-sectional area) at different positions to control fluid flow characteristics. By modifying channel dimensions along the flow path, the system achieves high flow resistance in critical sections to overcome surface tension effects, while maintaining easier fluid expulsion capability at outlet regions. The parameter changes are strategically designed to address different flow challenges at different locations within the fluidic network.