Overview
- The study published in PNAS, released Monday, shows the roughly 2 mm honey bee stinger acts as a compact double‑piston pump that can keep delivering venom after the bee leaves.
- Two sliding lancets carry flexible valves that inflate and collapse like pistons while moving on an olistheter rail, pumping in opposite directions and passing each other to maintain continuous flow.
- Researchers captured the action with high‑speed video of bees stinging a clear gel, mapped internal geometry with microCT scans, and confirmed the motions using an up‑scaled 3D‑printed robot model.
- The mechanism explains autotomy: when a worker bee leaves its stinger behind, the detached stinger continues to bore into tissue and inject venom under its own power, which helps account for prolonged pain after a sting.
- The authors say the design principles could inspire tiny, minimally invasive medical or microfluidic pumps; the paper notes no competing interests and builds on century‑old observations about venom chambers and valves.