Single-Lumen Blood Pumping Device with Flexible Membrane

The patent replaces the rigid housing with a flexible membrane that forms a blood chamber with entirely rounded surfaces. The membrane is inflated to create a spherical or ellipsoidal blood chamber geometry, eliminating all sharp edges and corners that would cause blood damage and clotting. This curvature principle maintains structural integrity through the flexibility and elasticity of the membrane material while ensuring biocompatible blood flow paths.

The patent uses a flexible membrane as the blood chamber boundary instead of a rigid housing. The membrane can be inflated and deflated to create and collapse the blood chamber, providing both structural strength and smooth, clot-free surfaces. The flexible nature of the membrane allows it to conform to rounded geometries and eliminates the need for sharp structural features.

The patent eliminates the need for multiple coating processes by designing the blood chamber with inherently rounded geometry from the membrane inflation process itself. The spherical or ellipsoidal shape created by inflating the membrane provides smooth transitions throughout the blood chamber without requiring additional smoothening steps.

The patent employs a disposable membrane pump where the entire membrane assembly is replaced after use. This eliminates the need for complex, time-consuming coating processes to ensure clot-free surfaces, as the disposable nature of the device allows for simple manufacturing without expensive surface treatment steps.