What Is the Optimal Geometry of Dissolving Microneedle Arrays? A Literature Review

Area of Science:

• Biomaterials Science
• Drug Delivery Systems
• Nanotechnology

Background:

• Dissolving microneedle arrays (DMNAs) are an innovative approach to drug and vaccine delivery, offering advantages over traditional hypodermic needles.
• Key benefits include painless administration and the elimination of the need for trained healthcare personnel.

Purpose of the Study:

• To investigate the optimal geometry of dissolving microneedle arrays (DMNAs) for efficient and safe drug delivery.
• To understand how DMNA geometry influences mechanical strength and skin penetration capabilities.

Main Methods:

• A comprehensive review evaluating the effects of various geometric parameters of DMNAs.
• Analysis focused on shape, aspect ratio, length, base width, tip diameter and angle, and spacing.

Main Results:

• DMNA geometry significantly impacts mechanical strength, insertion force, and penetration depth into the skin.
• Specific geometric configurations are required to ensure microneedles remain intact during skin insertion.

Conclusions:

• Optimizing DMNA geometry is essential for successful drug and vaccine delivery.
• Further research into DMNA design can enhance the efficacy and patient experience of transdermal administration.