Construction of an artificial heart pump performance test system

Area of Science:

• Biomedical Engineering
• Cardiovascular Physiology
• Medical Device Testing

Background:

• Bench testing of rotary left ventricular assist devices (LVADs) requires a realistic simulation of the human circulatory system's pressure and flow dynamics.
• Existing testing methods may not adequately replicate the complex physiological and pathological states encountered in patients.

Purpose of the Study:

• To design and validate a hydraulic loop capable of simulating the human circulatory system for bench testing of rotary left ventricular assist devices (LVADs).
• To model diverse physiological conditions, including rest, sleep, physical activity, and various pathological states, within the hydraulic loop.

Main Methods:

• The hydraulic loop incorporates pulsatile cardiac simulators (left and right), air/water tanks for venous and arterial compliance, and tygon tubing for flow resistance.
• A tuning clamp was integrated to dynamically adjust system resistance, mimicking variations under different cardiac pressure/flow conditions.
• Simulated responses were rigorously compared against established literature data to ensure loop accuracy and performance validation.

Main Results:

• The hydraulic loop successfully simulated pressure/flow responses across a spectrum of physiological and pathological states.
• Component selection and system design allowed for effective modeling of circulatory compliances and resistances.
• Validation against literature data confirmed the loop's capability to accurately represent human cardiovascular dynamics.

Conclusions:

• The developed hydraulic loop provides a robust and validated platform for the bench testing of rotary left ventricular assist devices (LVADs).
• The system's ability to simulate diverse physiological and pathological states enhances the relevance and reliability of LVAD performance evaluation prior to clinical application.