Biodegradable polymeric insulin microneedles - a design and materials perspective review

Area of Science:

• Biomaterials Science
• Drug Delivery Systems
• Nanotechnology

Background:

• Microneedle (MN) devices are increasingly preferred over traditional injections for their ease of use and reduced pain.
• Patients with chronic conditions like diabetes seek alternatives to frequent subcutaneous insulin injections.
• Insulin microneedles (INS-MNs) aim to improve patient compliance through pain-free, controlled peptide delivery.

Purpose of the Study:

• To review the design characteristics and applications of biodegradable/dissolvable polymeric INS-MNs.
• To highlight prospective approaches for safe, controlled-release INS-MN formulation.
• To outline the significance of biodegradable polymers in INS-MN technology.

Main Methods:

• Review of existing literature on biodegradable polymeric INS-MNs.
• Analysis of MN design factors, including polymer selection, fabrication, and evaluation.
• Exploration of various delivery routes: transdermal, intra-oral, gastrointestinal, and implantable.

Main Results:

• Biodegradable polymers offer advantages in fabrication, cost, and bioerodability for INS-MNs.
• INS-MNs facilitate insulin passage through the skin's stratum corneum into dermal capillaries.
• Research has expanded INS-MN applications beyond transdermal to other mucosal and implantable routes.

Conclusions:

• Biodegradable polymeric INS-MNs represent a promising technology for improved insulin therapy.
• Careful selection of bio-erodible polymers and optimized MN design are crucial for efficacy.
• INS-MNs have the potential to significantly enhance patient adherence and quality of life.