One tiny patch instead of day after day of injections: a heat-triggered microneedle delivers two fertility hormones, one after the other

Fertility treatment can mean injection after injection, on a strict clock. A team at Yonsei University College of Medicine and Severance Hospital in Seoul has built a tiny microneedle patch that could one day replace many of them with a single application. The patch holds two hormones in separate layers: the first, FSH, seeps out slowly over three days to help eggs mature; then a touch of mild heat makes the needle change shape — from an X to an O — and pushes out the second hormone, hCG, over about a day to trigger ovulation, in exactly the order treatment needs. In rabbits, one patch prompted ovulation about as well as the usual series of injections, with steadier hormone levels. This is early, animal-only research — nobody knows yet whether it will work safely in people — but it points to a kinder, simpler shape for a gruelling routine.

SDG 3 · Good health and well-being — Mechanism: tech innovation