| 摘要 |
In the illustrated embodiment, a patient fixation strap is releasably secured to a roller which is freely rotatable on the shaft of a control handle. A spring is coiled on a stationary stop and has one end engageable with the roller so that a slight rotation of the roller due to strap tension wraps the spring tightly on the stop to hold the strap. If the handle is turned to further increase strap tension, an entrainment member fixed to the shaft engages the roller and moves the roller against the spring end in the spring unwinding direction to release the stop. If the handle is turned to release strap tension, the same entrainment member acts on the opposite end of the spring in the spring unwinding direction. Thus tension and release of the strap can be accomplished with one hand.
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