An improved left ventricular cannula for chronic dynamic blood pump support

Area of Science:

• Biomedical Engineering
• Cardiovascular Physiology
• Medical Device Design

Background:

• Dynamic blood pumps for ventricular unloading are crucial in treating heart failure.
• Existing cannula tips can cause inflow occlusion due to negative pressure and intraventricular structures.
• Cannula tip geometry significantly impacts the performance of ventricular unloading devices.

Purpose of the Study:

• To develop and evaluate a novel "trumpet" mouth cannula tip for dynamic blood pumps.
• To overcome the limitation of inflow occlusion caused by conventional cannula designs.
• To assess the anatomic and hemodynamic interaction of the trumpet cannula within the ventricular apex.

Main Methods:

• A novel "trumpet" mouth cannula was designed with specific criteria for apex stenting and tip placement.
• In vivo evaluation of the prototype trumpet cannula against conventional designs (caged, blunt, tapered).
• Assessment of anatomic and hemodynamic interaction within the ventricular apex, including post-mortem examination.

Main Results:

• Post-mortem examination confirmed no myocardial obstruction in the inflow tract for all tested cannula designs.
• The trumpet mouth cannula demonstrated satisfactory hemodynamic performance.
• The novel design effectively addressed the issue of inflow occlusion.

Conclusions:

• The trumpet mouth cannula design is a promising solution to prevent inflow occlusion in dynamic blood pumps.
• This design ensures proper tip placement and apex stenting, crucial for effective ventricular unloading.
• Further studies are warranted to fully establish the clinical utility of the trumpet cannula.