Fabricación de un molde maestro para microagujas con un orificio de ventilación de aire del tamaño de una micra

Overview

This article introduces a unique method for fabricating master molds with an air-vent hole to prevent air entrapment during viscous polymer casting, enabling the fabrication of gelatin microneedles with sharp tips. By reducing the casting volume of high-viscosity gelatin, thin-walled hollow pyramidal microneedles could also be fabricated.

Key Study Components

Area of Science

• Microfabrication
• Biomedical Engineering
• Polymer Science

Background

• Advanced microfabrication techniques are essential for creating microneedles.
• Challenges include preventing air entrapment and ensuring tip sharpness.
• Current methods involve surgical micromachining and vacuum-assisted molding.
• High-resolution microscopy is used for characterization.

Purpose of Study

• To develop a method that minimizes air entrapment during the casting process.
• To achieve consistent sharpness in microneedle tips.
• To fabricate thin-walled hollow pyramidal microneedles.

Methods Used

• Aspirating distilled water into a syringe and mixing with gelatin powder.
• Using a precision balance for accurate measurement of gelatin.
• Stirring the mixture to break apart clumps of gelatin.
• Employing a water bath for temperature control during the process.

Main Results

• Successful fabrication of microneedles with sharp tips.
• Reduction in air entrapment during the casting process.
• Demonstration of thin-walled hollow pyramidal structures.
• Improved consistency in microneedle production.

Conclusions

• The new method enhances the fabrication of gelatin microneedles.
• It addresses key challenges in microneedle manufacturing.
• This approach could lead to advancements in drug delivery systems.

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