One of the hardest problems in wearable microneedle systems is not the microneedles themselves—it is keeping them comfortably, reliably, and safely in the skin during real life. Daily movement, sweat, showers, body hair, and long wear times all place conflicting demands on adhesion. ZP’s patent WO 2021/156453 addresses this challenge head-on and forms a critical pillar of ZP’s wearable microneedle IP moat.
This invention protects a smart adhesive patch architecture designed specifically for wrist-worn microneedle devices. Rather than relying on a single aggressive adhesive, the system separates functions: a skin-facing adhesive optimized for comfort, breathability, and hair tolerance, and a reinforced central bonding zone that mechanically stabilizes the microneedle capsule. The microneedles are held securely in place, while forces from movement or accidental pulls are absorbed by the patch structure instead of being transmitted directly to the skin.
A key innovation lies in how the patch manages hair, airflow, and skin health. Micro-perforations, textured surfaces, and breathable adhesive patterns reduce hair pull, irritation, and maceration, while still delivering the holding power required for multi-day wear. The patch is flexible enough to conform to the wrist, yet locally stiffened around the microneedle interface to maintain insertion stability. This balance is essential for continuous monitoring outside controlled environments.
Within ZP’s broader portfolio, this patent complements IP covering microneedle geometry, capsules, insertion verification, repositioning, signal integrity, and modular replacement. Together, these inventions protect the full system—from how microneedles enter the skin, to how they stay there comfortably, to how reliable data is maintained over time.
For partners working with ZP, this patent is more than an adhesive solution. It is part of a system-level IP moat that de-risks wearable microneedle products at the point where laboratory designs most often fail: real-world, long-term use on real people.
