Numerical simulation of microneedles' insertion into skin.
1State Key Laboratory of Structural Analysis for Industrial Equipment, Department of Engineering Mechanics, Dalian 116023, PR China.
Computer Methods in Biomechanics and Biomedical Engineering
|April 12, 2011
Summary
This study simulates microneedle insertion into skin using finite element analysis. Numerical results align with experimental data, aiding in optimizing microneedle design for transdermal drug delivery.
Area of Science:
- Biomedical Engineering
- Materials Science
- Computational Mechanics
Background:
- Transdermal drug delivery offers a needle-free alternative to traditional methods.
- Microneedles are emerging as a promising technology for enhanced drug permeation.
- Understanding the mechanical interaction between microneedles and skin is crucial for effective system design.
Purpose of the Study:
- To numerically simulate the insertion of microneedles into human skin.
- To develop a multilayered skin model for accurate mechanical analysis.
- To investigate the influence of microneedle geometry and skin properties on insertion forces.
Main Methods:
- Finite element method (FEM) was employed for numerical simulation.
- A multilayered skin model (stratum corneum, dermis, hypodermis) was constructed.
- Effective stress failure criterion coupled with element deletion technique predicted insertion and failure.
Main Results:
- Simulated deformation and failure of skin closely matched experimental data.
- Insertion forces predicted by the model showed good agreement with experimental values.
- Analysis revealed significant impact of microneedle geometry (tip area, wall angle, thickness) and skin mechanical properties on insertion force.
Conclusions:
- The developed numerical model accurately predicts microneedle insertion into skin.
- Findings provide valuable insights for optimizing microneedle design for transdermal drug delivery systems.
- This simulation approach aids in reducing experimental iterations and improving device efficacy.
