Luer-lock stopcocks can give multiple procedural option and a side arm for optional different access. 一次性使用旋塞是一种用于输液过程的辅助性医疗器械，主要用来在输液时作为通路的开关和选择不同通路的转换器。
Unlike switching current signals to an ammeter, switching a current source to multiple loads usually does not require maintaining the current path at all times. 与将多个电流信号切换至单台安培表不同，将一个电流源切换至多个负载通常不需要任何时候到维持电流通路的连续性。
