Control of tissue growth in textured blood-contacting surfaces

摘要

A blood pump provides a mechanism to prevent excessive growth of tissue at the transition zone between a smooth blood contacting surface and a textured blood contacting surface. The blood pump includes a blood flow channel having a textured surface, a smooth surface adjacent to the textured surface, and a rotor positioned within the blood flow channel. The rotor includes at least one impeller blade that defines a sweep when the rotor turns. The impeller blade is designed to cut off a portion of a biologic lining as it grows from the textured surface into the sweep of the impeller blade.