Spring-Actuated Rotary Micromotor for Sub-Millimetric Propulsion

The patent extracts and eliminates the three-coil circular arrangement from the micro-motor design. Instead, it uses a linear electromagnetic actuator with a single coil and permanent magnet configuration, removing the bulky circular coil structure while retaining the essential function of generating rotational motion through a different mechanical transformation mechanism involving spring elements and a wheel-platform.

The patent transitions from a two-dimensional circular coil arrangement to a one-dimensional linear actuator configuration. The linear back-and-forth motion of the spring element is transformed into rotational motion of the wheel-platform, effectively converting linear dimensional movement into rotational functionality, thereby achieving rotation without requiring a circular footprint.

The patent employs oscillating spring elements that undergo sequential elongation and compression phases, creating a vibratory motion pattern. This mechanical vibration of the spring-abutment system generates propulsive forces that effectively overcome the high drag forces characteristic of low Reynolds number environments, enabling deep penetration through viscous materials like brain tissue.

The patent utilizes periodic actuation of the spring elements through the electromagnetic actuator, creating repeated cycles of elongation and compression. This periodic action generates continuous propulsive impulses that accumulate to overcome viscous drag forces, enabling sustained movement and deep penetration through the viscous medium.