Modeling diffusion-based drug release inside a nerve conduit in vitro and in vivo validation study
Pratima Labroo1, Scott Ho1, Himanshu Sant1
1Department of Mechanical Engineering, University of Utah, Salt Lake City, UT, 84112, USA.
Drug Delivery and Translational Research
|May 6, 2020
Summary
This study developed a mathematical model to optimize drug diffusion in nerve conduits. The model accurately predicts drug release, enabling predictable tuning of delivery via device parameters.
Area of Science:
- Biomedical Engineering
- Drug Delivery Systems
- Mathematical Modeling
Background:
- Nerve conduits are crucial for peripheral nerve repair.
- Controlled drug delivery enhances therapeutic outcomes.
- Optimizing drug release kinetics is essential for efficacy.
Purpose of the Study:
- To develop and validate a mathematical model for drug diffusion in a nerve conduit.
- To understand how device parameters influence drug concentration and release.
- To assess the reliability of a hole-based drug delivery system.
Main Methods:
- Fick's law of diffusion and the finite difference method were used for mathematical modeling.
- A physical microfluidic (μFD) model was employed for verification.
- In vitro/in vivo release tests were conducted using prototype devices.
Main Results:
- The mathematical model accurately predicted drug diffusion and release.
- Drug release rate can be tuned by adjusting reservoir concentration, hole size, and number of holes.
- The model demonstrated less than 10% error compared to microfluidic device data.
Conclusions:
- The developed mathematical model reliably predicts drug delivery from nerve conduits.
- Hole-based drug delivery systems offer tunable and predictable drug release profiles.
- This approach provides flexibility for optimizing therapeutic strategies in nerve regeneration.
More Related Videos
Related Concept Videos
01:13In Vitro Drug Dissolution: Compendial Testing Models I
147
Compendial dissolution methods are standardized procedures defined by pharmacopeias to evaluate the rate at which a drug dissolves in a specific medium. These methods ensure batch-to-batch consistency, enable quality control, and support the prediction of drug bioavailability. They are critical for both immediate and modified-release drug products.The apparatuses used for dissolution testing differ in their design and mechanical function, but all aim to simulate the physiological environment of...
147
01:09In Vitro Drug Dissolution: Compendial Testing Models II
151
Various dissolution methods are utilized to assess a drug’s dissolution rate, including the flow-through cell, paddle-over-disk, cylinder, and reciprocating disk methods.The flow-through cell apparatus (USP (United States Pharmacopeia) method 4) comprises a reservoir for the dissolution medium and a pump that propels the medium through the cell containing the test sample. This method is crucial for assessing modified-release dosage forms with minimally soluble active ingredients,...
151
01:10In Vitro Drug Release Testing: Overview, Development and Validation
199
In vitro dissolution and drug release tests assess how quickly and how much of a drug is released from its dosage form into an aqueous medium under standardized laboratory conditions. These tests are essential tools in pharmaceutical development and quality assurance, offering insight into the drug's performance before clinical use.During formulation development, dissolution testing identifies incomplete or inconsistent drug release issues. It also supports decisions on selecting the optimal...
199
01:17In Vitro Drug Dissolution: Alternative Methods
139
Alternative drug dissolution methods include the rotating bottle, intrinsic dissolution test, peristalsis, and the Franz diffusion cell method. The rotating bottle method involves meticulously rotating tightly capped controlled-release beads in a temperature-controlled bath. Periodic decanting of samples allows for residue assay, followed by refilling with fresh medium and testing at various pH levels to emulate the gastrointestinal tract conditions.In contrast, the intrinsic dissolution test...
139
01:16Methods for Studying Drug Absorption: In vitro
509
In vitro experiments are crucial for understanding the transport and absorption of drugs through biological materials. These studies employ varied methods such as the diffusion cell method, the everted sac technique, and the everted ring technique.
The diffusion cell method uses a two-compartment cell, including a donor compartment with the drug solution, which simulates the environment where the drug is applied, and a receptor compartment with a buffer solution, which simulates the environment...
The diffusion cell method uses a two-compartment cell, including a donor compartment with the drug solution, which simulates the environment where the drug is applied, and a receptor compartment with a buffer solution, which simulates the environment...
509
01:15Theories of Dissolution: Diffusion Layer Model
1.5K
Dissolution, the process by which drug particles dissolve in a solvent, is explained by the diffusion layer model, a theoretical framework that simulates the absorption of oral drugs and allows us to analyze experimental data.
This process starts with a thin layer, saturated with the drug, forming at the interface between the solid and liquid. The solute then diffuses from this layer into the main solution. The Noyes-Whitney equation suggests that the rate of dissolution relies on the diffusion...
This process starts with a thin layer, saturated with the drug, forming at the interface between the solid and liquid. The solute then diffuses from this layer into the main solution. The Noyes-Whitney equation suggests that the rate of dissolution relies on the diffusion...
1.5K