Microfluidic Device Perpendicular Channel Convective Clearance
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Solution Overview
Problem
Current dialysis devices face challenges in increasing convective clearance of solutes while maintaining safe hematocrit levels, as reducing fluid volume in blood channels can lead to unsafe hematocrit levels.
Innovation Solution
A microfluidic device with a network of channels, including a blood channel, an infusate channel, and a waste channel, separated by filtration membranes, where fluid is introduced perpendicular to the blood channel to increase convective transport, maintaining a constant fluid volume and hematocrit level through structural supports and anticoagulant coatings.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the fluid volume in the blood channel is decreased to increase convective clearance, then the convective clearance of solutes is improved, but the hematocrit level becomes unsafe
Solution Approach 1:
The patent transitions from a single-channel linear flow configuration to a three-dimensional network of channels with perpendicular intersections. Blood flows through first channels while infusate is introduced perpendicular to these channels through second channels, creating a multi-dimensional flow architecture that increases clearance efficiency without compromising hematocrit safety.
Solution Approach 2:
The patent implements a nested channel structure where second channels (carrying infusate) are positioned perpendicular to and intersect with first channels (carrying blood). This nested arrangement allows infusate to be introduced into the blood channel from multiple directions, enhancing convective transport while maintaining safe fluid volumes.
2Productivity
If the device size is increased to improve convective clearance, then the clearance efficiency is improved, but the device complexity and size increase
Solution Approach 1:
By introducing perpendicular channel orientations and three-dimensional fluid introduction, the patent achieves enhanced convective clearance within a compact footprint. The multi-dimensional channel network maximizes the effective filtration surface area without proportionally increasing the overall device volume.
Solution Approach 2:
The patent combines multiple functions into a single integrated microfluidic device: blood filtration, infusate delivery, and waste collection all occur within one compact unit. The network of channels merges these separate processes into a unified system, improving clearance efficiency without requiring multiple separate components.
3Productivity
If the fluid volume profile varies along the channel length to increase clearance, then the convective transport is improved, but the hematocrit distribution becomes non-uniform and unsafe
Solution Approach 1:
The patent applies different flow conditions to different regions of the device. Infusate is introduced at specific locations through second channels that intersect with first channels at predetermined positions along their lengths. This localized fluid introduction creates optimal convective transport in specific regions while maintaining uniform hematocrit distribution throughout the blood channel.
Solution Approach 2:
The patent pre-configures the channel network with predetermined intersection points where infusate channels meet blood channels. This preliminary structural arrangement ensures that as blood flows through the first channels, infusate is introduced at optimal locations to maintain constant fluid volume and uniform hematocrit levels throughout the channel length.
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 solution effectively increases convective clearance of solutes without compromising safe hematocrit levels, allowing for higher levels of toxin removal without the need for larger device sizes or varying fluid volume profiles.
Implementation Method 1
a first filtration membrane separating the one or more First Channels from the at least one Second Channel
Implementation Method 2
a second filtration membrane separating the one or more First Channels from the at least one Third Channel
Implementation Method 3
fluid is flowed in a direction perpendicular to the direction of fluid flow in the one or more First Channels, such that fluid flows from the at least one Second Channel into the one or more First Channels
Data Source
AI summary
A microfluidic device for increasing convective clearance of particles from a fluid is provided. A network of first channels can be separated from a network of second channels by a first membrane. The network of first channels can also be separated from a network of third channels by a second membrane. Fluid containing an analyte can be introduced in the network of first channels. Infusate can be introduced into the network of second channels, and waste-collecting fluid can be introduced into the network of third channels. A pressure gradient can be applied in a direction perpendicular to the direction of fluid flow in the network of first channels, such that the analyte is transported from the network of first channels into the network of third channels through the second membrane.