Modular Subcutaneous Absorption Model for Blood and Lymph Pathways
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Solution Overview
Problem
Current in vitro models for subcutaneous drug administration lack the ability to accurately predict drug absorption and release, failing to account for both blood and lymphatic pathways, and do not adequately mimic the in vivo environment.
Innovation Solution
A modular in vitro device with a center chamber and two side chambers, separated by membranes, allowing for customizable configurations to simulate subcutaneous conditions, coupled with a fluid circulation system and machine learning for predictive modeling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a simple one-chamber in vitro system is used, then device complexity is reduced, but the ability to simulate both blood and lymphatic absorption pathways is lost
Solution Approach 1:
The device is divided into a center chamber (subcutaneous site) and two separate side chambers (blood and lymphatic pathways), each separated by semipermeable membranes. This segmentation allows independent simulation of both absorption pathways while maintaining manageable device complexity through modular design.
Solution Approach 2:
The in vitro device is designed to universally simulate multiple absorption pathways (both blood and lymphatic) within a single system. The modular chamber configuration allows the device to adapt to different formulation types and test scenarios, providing multi-functional capability for comprehensive subcutaneous absorption studies.
2Manufacturing precision
If fixed chamber geometry is used, then manufacturing precision is improved, but the ability to optimize for in vivo similarity is reduced
Solution Approach 1:
The device incorporates adjustable and configurable chamber geometries that can be optimized to match different in vivo subcutaneous site characteristics. While maintaining precise manufacturing standards, the design allows flexibility in chamber dimensions, membrane surface areas, and fluid flow rates to better simulate physiological conditions for different injection sites.
3Ease of operation
If standard in vitro systems are used, then ease of operation is improved, but the accuracy of predicting in vivo drug performance is reduced
Solution Approach 1:
The device uses semipermeable membranes as intermediaries between the center chamber and side chambers to simulate the selective permeability of biological barriers. This intermediary mechanism enables accurate prediction of drug absorption while maintaining ease of operation through standardized membrane replacement and straightforward experimental protocols.
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
Enables accurate prediction of subcutaneous drug absorption and release, providing data for computational modeling and in vivo correlation, enhancing the reliability of pharmacokinetic property predictions.
Implementation Method 1
Each first membrane includes a first size exclusion cutoff. A second membrane is provided that is configured to be positioned between the second side of the center chamber and second open side of the second side chamber. The second membrane includes a second size exclusion cutoff.
Implementation Method 2
A matrix material is provided that is configured to be included in the center chamber during measurement of absorption of a test agent
Data Source
AI summary
A modular in vitro device can be configured as a subcutaneous absorption model. The in vitro device can include a center chamber and a matrix material configured to be included in the center chamber during measurement of absorption of a test agent. A first side chamber is configured to couple with the center chamber, with least one first side opening configured to fluidly couple with the center chamber. A first membrane is configured to be positioned between the center chamber and first side. A second side chamber similar to the first side chamber is provided, with a second membrane configured to be positioned between the center chamber and second side chamber. The center chamber, first side chamber, and second side chamber are configured to be modular for combining with the first membrane and second membrane in a lateral arrangement.