Modeling and identification of an intra-aorta pump

Area of Science:

• Biomedical Engineering
• Cardiovascular Devices
• Fluid Dynamics

Background:

• The intra-aorta pump (IAP) is a novel left ventricular assist device (LVAD) designed for cardiac support without percutaneous wires or conduits.
• Its implantation between the radix aortae and aortic arch aims to prevent aortic valve damage.
• Accurate prediction of pump performance is essential for optimizing its clinical application.

Purpose of the Study:

• To develop and validate a nonlinear lumped parameter model for the intra-aorta pump.
• To predict the mean pressure head and blood flow characteristics of the IAP.
• To establish a model with clear physical significance for potential extension to other blood pumps.

Main Methods:

• A nonlinear lumped parameter model was established, incorporating a speed-controlled current source, internal resistor, and inductance.
• The model simulates the pressure-flow rate relationship, representing impeller kinetic energy, radial clearance resistance, and blood inertia.
• Model parameters were determined experimentally, and the model's predictive capability was tested on an in vitro mock loop.

Main Results:

• The developed model accurately predicts the pressure head and blood flow of the intra-aorta pump.
• Experimental validation on an in vitro mock loop demonstrated prediction accuracy with an error of less than 5% across all tested conditions.
• The model successfully generated various pump states, from suction to pulmonary congestion.

Conclusions:

• The nonlinear lumped parameter model provides an accurate and physically significant method for predicting intra-aorta pump performance.
• This model is valuable for optimizing the design and application of the intra-aorta pump and can be adapted for other blood pumps.
• The findings support the potential of the intra-aorta pump as a viable cardiac assist device.