Two independent device advances promise finer intraprocedural control and noninvasive biochemical sensing. A concentric‑tube catheter steered under MRI guidance enables precise endoluminal interventions with enhanced navigation and targeting, as reported by a research team led by P. Lloyd, N. Murasovs and Y.L. May. Separately, a compact mid‑infrared (mid‑IR) fiber probe developed by T.A. Lee and T. Hutter demonstrated in vivo multi‑compound skin monitoring in Nature Communications, offering a route to real‑time biochemical readouts on tissue surfaces.