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A Microfluidic Model of Biomimetically Breathing Pulmonary Acinar Airways

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Dynamic model of a sac-type pneumatically driven artificial ventricle.

D B Geselowitz, G E Miller, W M Phillips

Journal of Biomechanical Engineering

|May 31, 2013

Summary

This summary is machine-generated.

A dynamic model was developed for a sac-type artificial ventricle. This model accurately predicts the ventricle's fill-limited and ejection-limited modes under various operating conditions.

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Area of Science:

Biomedical Engineering
Cardiovascular Devices
Fluid Dynamics

Background:

Artificial heart research is crucial for treating end-stage heart failure.
Pneumatically driven sac-type artificial ventricles are a key area of development.
Understanding ventricle performance under varying loads is essential for device optimization.

Purpose of the Study:

To develop a dynamic model for a pneumatically driven sac-type artificial ventricle.
To characterize the hydraulic load of a mechanical mock circulatory system.
To predict the operational modes of the artificial ventricle.

Main Methods:

Obtained inlet/outlet pressures and flows across a wide range of operating conditions.
Connected the artificial ventricle to a mechanical mock circulatory system.
Developed a dynamic model incorporating instantaneous pressures, flows, and time-varying sac pressure.

Main Results:

The mock circulatory system's load was characterized by linear resistance and capacitance.
The artificial ventricle's outlet port exhibited inertance and square law resistance.
The inlet port showed nonlinear resistance dependent on valve type.
The dynamic model successfully predicted fill-limited and ejection-limited modes.

Conclusions:

A comprehensive dynamic model for a sac-type artificial ventricle was successfully developed.
The model accurately captures the complex fluid dynamics and operational modes.
This model serves as a valuable tool for designing and evaluating artificial ventricle performance.