During normal breathing, the kidneys move up and down due to the diaphragm motion and the renal artery subsequently experiences bending. Whether bending of the renal artery during respiration impacts stent bending fatigue was not previously known. This study presents the first evaluation of the effect of the kidney movement on renal stent bending fatigue performance. Measurements of fluoroscopic images demonstrated a minor (1.7deg) change in bending angle between inspiration and expiration for an 18mm long renal stent after removing rigid-body motion. Finite element analysis revealed excellent fatigue resistance of the studied renal stent under simulated respiratory motion.

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