Evaluating piezoelectric hydraulic pumps as drivers for pulsatile pediatric ventricular assist devices

Abstract

Piezohydraulic pumps are high power density motors, which can be theoretically miniaturized with minimal loss in power output. The feasibility of using piezohydraulic pumps in pulsatile pediatric ventricular assist devices is presented in this study. A theoretical analysis is presented to calculate the piezohydraulic pump dimensions needed to meet flow and pressure requirements. In addition, an existing piezohydraulic pump was incorporated into a ventricular assist device driver to drive a pulsatile pediatric 30-mL stroke ventricular assist device as a proof of concept. The driver was tested at heart rates ranging from 50 to 110 beats per minute in an in vitro mock circulation to characterize its performance. The maximum drive pressure was 33 kPa with a peak flow rate of 6 L/min against a 10-kPa back pressure. The maximum mean flow rate from the ventricular assist device outlet was 3 L/min at 100 beats per minute operation. These results compare well to commercially available systems that output between 25 and 40 kPa drive pressure and flows between 0 and 10 L/min against 10–16 kPa pressures.

Effects of driving mode on the performance of multiple-chamber piezoelectric pumps with multiple actuators

“…(6) indicates that the net liquid discharged from the pump chamber will vary with the generated pressure. As mentioned above, the pressure differs greatly with the driving modes of the pump.…”

“…Research and development on piezoelectric pumps have made considerable progress in the last three decades. VALDOVINOS, et al [6] , developed a piezohydraulic pump used in pulsatile pediatric ventricular assist devices. LENG, et al [7] , presented a spiral-tube-type valveless piezoelectric pump with gyroscopic effect.…”

Development of a low-voltage piezohydraulic pump for compact hydraulic systems

“…There has been considerable effort in utilizing piezohydraulic and electrohydraulic pumps as high power density actuators for automotive, aerospace and biomedical engineering applications [14,23]. Researchers have asserted that leveraging the high frequency bandwidth of piezoelectric actuators and incompressibility of fluid could result in devices that can deliver higher power output within a compact volume.…”

A miniature piezomembrane hydraulic pump with decreasing chambers in succession

“…With an abundant study of smart materials, plenty of researchers have applied the intelligent-material-based driving technology into miniature hydraulic pump and put forward various micropumps different in driving type and working mode. Several principles, such as piezoelectrics (Valdovinos et al, 2014; Woo et al, 2020), electrostatics (Sadeghi et al, 2016; Yang et al, 2018), electromagnetics (Liu et al, 2017; Murakami et al, 2019), and thermal actuation (Qu et al, 2018; Vaishak et al, 2019), have been adopted to develop micropumps. Among them, piezoelectric hydraulic pump (PHP) has a wide application prospect in the micro hydraulic system.…”