Overview
- The PNAS study, which was published Monday, October 12, 2026, shows the roughly 2 mm honey bee stinger acts as a double‑piston micro‑pump that continues to inject venom after detaching from the bee.
- High‑speed video captured two sliding lancets moving on an olistheter rail while flexible valve structures alternately expand and collapse to pump venom and limit backflow.
- Researchers validated the mechanism with microCT scans and an up‑scaled, flexible 3D‑printed model that reproduced the pumping cycle seen in gel that mimics skin.
- The team notes a remaining technical question about exactly how the valves deform when they pass one another in the middle of the stroke, which will require further study.
- Beyond explaining autotomy-driven venom delivery and ongoing pain from stings, the compact collapsible‑valve design could inspire micropumps for microfluidic and minimally invasive medical devices.