This paper investigates a wireless sensing system for monitoring the patency of biliary stents. A magnetoelastic microsensor integrated into the stent detects sludge accumulation via changes in resonant frequency and quality factor. The system addresses challenges in sensor miniaturization, wireless range, signal feedthrough, and clinical use. In vivo experiments in a swine model demonstrated a signal-to-noise ratio of ~10⁶ at a range of 17 cm, representing the first reported signals from a passively wireless magnetoelastic sensor implanted in a live animal.
Publisher
Microsystems & Nanoengineering
Published On
Authors
Ramprasad M. Nambisan, Scott R. Green, Richard S. Kwon, Grace H. Elta, Yogesh B. Gianchandani
Tags
wireless sensing
biliary stents
magnetoelastic microsensor
signal-to-noise ratio
in vivo experiments
sludge accumulation
resonant frequency
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