Microscale engineering of hollow microneedle tips: design, manufacturing, optimization and validation

Area of Science:

• Biomedical Engineering
• Materials Science
• Drug Delivery

Background:

• Microneedle technology offers a promising avenue for painless transdermal and intradermal drug delivery.
• Current hollow microneedles face challenges in achieving both short tip profiles and sufficient sharpness for effective skin penetration.
• Existing hypodermic needles have long bevels unsuitable for microneedle applications requiring sub-millimeter depths.

Purpose of the Study:

• To design and optimize microneedle tip profiles for enhanced drug delivery performance.
• To investigate manufacturing strategies for producing these optimized microneedle tips.
• To experimentally validate the improved piercing capabilities of the designed tip profiles.

Main Methods:

• Analytical modeling was employed to design and optimize microneedle tip geometries.
• Manufacturing strategies were explored for reliable fabrication of the designed profiles.
• Experimental validation was conducted to compare the piercing performance of optimized tips against conventional designs.

Main Results:

• The study identified an optimal microneedle tip geometry through progressive analysis.
• The optimized tip design evolved from single plane bevel (SPB) to hex plane bevel (HPB).
• Experimental results demonstrated superior piercing performance of the optimized tip profile.

Conclusions:

• Optimized microneedle tip geometry, specifically the hex plane bevel (HPB), enhances piercing performance for transdermal drug delivery.
• The development of advanced tip profiles and manufacturing techniques is crucial for effective microneedle therapeutics.
• This research contributes to the advancement of painless drug delivery systems with improved efficacy.