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The need for wireless condition monitoring and control of hydraulic systems in an autonomous and battery‐free manner is attracting increasing attention in an effort to provide improved sensing functionality, monitoring of system health, and to avoid catastrophic failures. The potential to harvest energy from hydraulic pressure ripples and noise is particularly attractive since they inherently have a high energy intensity, which is associated with the hydraulic mean pressure and flow rate. This paper presents a comprehensive overview of the state of the art in hydraulic pressure energy harvesting, which includes the fundamentals of pressure ripples in hydraulic systems, the choice of electroactive materials and device structures, and the influence of the fluid–mechanical interface. In addition, novel approaches for improving the harvested energy and potential applications for the technology are discussed, and future research directions are proposed and outlined. [ABSTRACT FROM AUTHOR]

Aortoenteric fistula ( AEF) is an uncommon condition, but carries high mortality, with increasing incidence. Conventional treatment of AEF by open debridement and bypass grafting has high mortality and morbidity rates. In the present study, we report on a patient with a history of open repair of impending ruptured abdominal aortic aneurysm, who presented with aortoduodenal fistula 9 years after the index operation. The patient was treated with endovascular stenting and recovered well afterwards. We also reviewed previous reports on the use of endovascular stents for the treatment of secondary AEF. [ABSTRACT FROM AUTHOR]