Thumb-sized 3D-Printed cymbal microneedle array (CyMA) for enhanced transdermal drug delivery

Area of Science:

• Biomedical Engineering
• Materials Science
• Pharmacology

Background:

• Transdermal drug delivery offers a non-invasive alternative to injections and oral medications, improving patient compliance.
• Microneedles enhance drug penetration through the stratum corneum but face limitations due to slow diffusion and need for external triggers.
• Current microneedle technologies require optimization for deeper and faster drug delivery.

Purpose of the Study:

• To introduce a lightweight, 3D-printed microneedle array integrated with an ultrasound transducer for improved transdermal drug delivery.
• To develop and optimize a microneedle system for efficient and sustained drug administration.
• To evaluate the efficacy of the developed microneedle system in a preclinical model.

Main Methods:

• A finite element model was developed for theoretical analysis and optimization of microneedle structural parameters.
• A prototype microneedle array was fabricated using high-precision 3D printing, incorporating a cymbal-type ultrasound transducer.
• In vivo experiments were conducted using a diabetic mouse model to assess systemic insulin delivery efficacy.

Main Results:

• The optimized 3D-printed microneedle array prototype is lightweight (20 g) and incorporates an ultrasound transducer.
• Local insulin delivery via the microneedle array (CyMA) demonstrated systemic effects comparable to intraperitoneal administration in diabetic mice.
• The technology facilitates deeper and faster transdermal drug delivery compared to conventional microneedles.

Conclusions:

• A compact and effective 3D-printed microneedle array system powered by ultrasound has been successfully developed.
• This technology shows significant promise for transdermal and intraoral therapeutic applications.
• The findings support the potential of ultrasound-assisted microneedles for enhanced drug delivery and patient convenience.