The U.S. FDA reported a class I recall for a subset of the Impella 5.5 with Smartassist due to leakage of purge fluid from a pump sidearm that could ultimately lead to a loss of pump function. Abiomed Inc., the maker of the device, had previously introduced corrective measures intended to suppress the problem with leakage, but those corrections have not completely resolved the problem, leading to the withdrawal of 466 units that were distributed in the U.S. between Sept. 8, 2021, and March 6, 2023.