Bioreactor Impeller Blades With Liquid-Driven Unfolding

The patent applies asymmetry by positioning the impeller blades in a non-axisymmetric collapsed state rather than a symmetric folded configuration. The blades are arranged at different radial distances from the drive shaft, with at least one blade positioned closer to the drive shaft than others, creating an asymmetric compact arrangement that minimizes space occupation while eliminating the need for complex mechanical transition systems.

The patent implements dynamics by allowing the blades to transition from collapsed to expanded state through rotation along the circumference of the drive shaft. This dynamic transition is enabled by the asymmetric positioning, which allows blades to naturally unfold into their operational axisymmetric configuration through rotational movement driven by liquid resistance during agitation, without requiring additional mechanical unfolding mechanisms.

The patent applies self-service by enabling the blades to automatically transition from the collapsed to the expanded state through their own interaction with the liquid medium. During agitation, liquid resistance acts on the asymmetrically positioned blades, naturally driving them to rotate into their axisymmetric operational configuration without requiring external mechanical assistance. This self-activating mechanism eliminates complex unfolding systems and reduces the risk of container damage.

The patent replaces complex mechanical unfolding systems with a fluid-dynamics-based transition mechanism. Instead of using motors, linkages, or other mechanical devices to unfold the blades, the system relies on the hydrodynamic forces generated during liquid agitation to naturally position the blades in their operational configuration. This substitution of mechanical systems with fluid-based actuation simplifies the overall system and improves reliability.

The patent uses dynamics to create a system that exists in two distinct states: a non-axisymmetric collapsed state for compact storage and transportation, and an axisymmetric expanded state for optimal agitation performance. The transition between these states is dynamic and automatic, triggered by the liquid agitation process itself. This allows the system to achieve both compactness when not in use and optimal performance when operational.

The patent applies parameter changes by altering the spatial arrangement of the blades between collapsed and expanded states. In the collapsed state, blades are positioned at asymmetric radial distances with reduced angular separation. During agitation, parameters such as blade angular position, radial distance, and orientation change as blades rotate into their axisymmetric operational configuration, optimizing agitation performance while maintaining compact storage capability.