Microneedle Patch
A drug delivery device containing arrays of microscopic needles (typically 25-2000 micrometres long) that painlessly penetrate the outer skin layer to deliver drugs directly to the dermis or epidermis. Microneedle technology is being developed for painless, needle-free peptide delivery as an alternative to conventional injection.
Technical Context
Microneedle technologies for peptide delivery include: dissolving microneedles (polymer matrix containing peptide that dissolves in dermal interstitial fluid upon insertion, releasing drug — no sharps waste), coated microneedles (drug coated on solid needle surface, deposited upon insertion), and hollow microneedles (miniature hypodermic needles that infuse drug into the dermis). Typical parameters: needle height 200-1500μm, array density 100-2000 needles/cm², tip diameter <20μm. The microneedle approach aims to provide painless, self-administered peptide delivery with room-temperature stability (dry formulations). Phase I/II clinical trials have been conducted for microneedle delivery of PTH, GLP-1 RAs, and other peptides, though none have yet received regulatory approval.