Metal Microneedle Array Wire Cutting for Batch Precision Manufacturing

The patent replaces complex photolithography and etching processes with a mechanical wire cutting system. A wire electrode directly cuts metal sheets to form microneedles, eliminating the need for chemical etching and multiple lithography steps. This mechanical substitution enables batch production of microneedles with high precision while significantly improving manufacturing efficiency and reducing costs.

The patent uses metal sheets (such as stainless steel or biocompatible alloys) as the base material for microneedles. These metallic materials provide both the necessary manufacturing precision for microneedle formation and superior mechanical properties including fracture resistance, toughness, and flexibility compared to brittle materials like glass and ceramics.

The patent divides a single large hypodermic needle into multiple small microneedles arranged in an array on a metal sheet. Each microneedle has a tip diameter of tens of microns or less, which is much smaller than conventional needles. This segmentation allows the array to pierce the stratum corneum effectively while minimizing pain and tissue damage, as the small size prevents activation of pain receptors and reduces mechanical trauma.

The patent creates localized pathways through the stratum corneum using microneedles. The microneedle array creates multiple micro-channels that concentrate drug delivery at specific penetration sites, overcoming the barrier effect of the stratum corneum. This localized approach enables sufficient drug dose delivery while maintaining the advantages of transdermal administration, including avoidance of first-pass metabolism and gastrointestinal side effects.