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Related Experiment Video

Updated: Aug 25, 2025

Polymeric Microneedle Array Fabrication by Photolithography

Polymeric Microneedle Array Fabrication by Photolithography

Published on: November 17, 2015

Microneedles: One-Plane Bevel-Tipped Fabrication by 3D-Printing Processes.

Isabella Villota¹, Paulo C Calvo¹, Oscar I Campo¹

¹Biomedical Engineering Research Group-GBIO, Universidad Autónoma de Occidente, Cali 760030, Colombia.

Molecules (Basel, Switzerland)

|October 14, 2022

Summary

This study optimized microneedle design for transdermal drug delivery using mathematical modeling and mechanical simulations. Optimized microneedles demonstrate mechanical stability and are suitable for drug delivery applications.

Keywords:

3D printing finite element analysis microneedles transdermal drug delivery

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Polymeric Microneedle Array Fabrication by Photolithography

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Area of Science:

Biomedical Engineering
Materials Science
Pharmacology

Background:

Transdermal drug delivery offers a minimally invasive alternative to traditional administration routes.
Microneedle technology is a key innovation in enhancing transdermal drug permeation.
Optimizing microneedle design is crucial for ensuring safety and efficacy in drug delivery devices.

Purpose of the Study:

To analyze and optimize microneedle design parameters, including length and diameter ratios.
To develop a robust mathematical model for predicting microneedle mechanical behavior.
To validate the mechanical integrity of 3D-printed microneedles for transdermal drug delivery applications.

Main Methods:

Microneedle design parameters (length, inner/outer diameter) were systematically studied.
Mechanical simulations using ANSYS software analyzed microneedle behavior under stress.
A mathematical model employing fourth-order polynomial regressions (R²=0.9993) was developed and validated.

Main Results:

Inner diameter ranged from 30 μm to 134 μm; outer diameter ranged from 208 μm to 250 μm.
The mathematical model predicted von Mises stresses around 17.931 MPa with a safety factor of four.
3D printing using biocompatible resin successfully fabricated microneedles with validated mechanical properties.

Conclusions:

The optimized microneedle design exhibits significant mechanical stability.
The developed mathematical model accurately predicts microneedle performance.
These microneedles represent a promising platform for advanced transdermal drug delivery systems.