Miniaturized Axial Flow Rotary Pump for Cardiac Assist

The patent applies dimensional change by transitioning from conventional radial flow pump geometry to axial flow pump geometry. This reorientation of the flow path from radial to axial direction allows the pump to achieve a reduced diameter profile while maintaining adequate pumping capacity. The axial flow configuration enables the pump to fit through peripheral arteries for minimally invasive implantation, resolving the contradiction between small diameter requirement and pumping performance.

The patent replaces the conventional mechanical heart-lung bypass system with a self-contained axial flow rotary pump that can be implanted directly into the vascular system. The pump uses magnetic bearing technology and axial flow geometry to achieve adequate pumping capacity without requiring external mechanical support systems. This substitution eliminates the need for sternotomy and heart-lung bypass, thereby reducing surgical trauma while maintaining pumping functionality.

The patent applies parameter changes by optimizing the axial flow path geometry and impeller design to maintain pumping efficiency despite the reduced diameter. The axial flow configuration allows for improved flow characteristics and reduced shear stress on blood, while the impeller geometry is specifically designed to compensate for the smaller size. Magnetic bearing parameters are also optimized to ensure stable operation at reduced diameters, thereby maintaining pump efficiency while enabling minimally invasive implantation.