Israel’s Microbot (see here) demonstrated a prototype of its self-cleaning shunt (SCS) at the International Society for Hydrocephalus and Cerebrospinal Fluid Disorders (ISHCFD) meeting in Italy.  The SCS prevents obstruction in the cerebrospinal fluid (CSF) catheters of hydrocephalus patients.

https://globenewswire.com/news-release/2019/01/17/1701297/0/en/Microbot-Medical-Showcases-a-Working-Prototype-of-its-Self-Cleaning-Shunt.html