| 摘要 |
A system and a method for orientation of a ring by rotation, including a cable engaging the ring which rotates about a ring axis, a motor assembly providing a first rotation reduction, and a stretcher for stretching the cable. The system has at least one proximal pulley and at least one distal pulley rotating about a pulley axis each pulley having grooves configured for receiving the cable therein. The ring is rotated by the motor assembly and the pulley assembly is configured to provide a second reduction of rotation to the ring relative to motor rotation, whereby the ring is driven via at least a double reduction of rotation relative to rotation of the motor, and the cable, the plurality of pulleys, and the ring provide a one-way mechanism.
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