There is a stop-cock between the trocar and syringe, and another at right angles to the syringe. A Manual of the Operations of Surgery Joseph Bell. The operation is performed with a combined instrument called the trocar and cannula.
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A Visi-Rocker is a double injection molded, two-color curved rocker actuator that provides vivid, unlighted indication of ON/OFF status. The Visi-Rocker is an attractive, durable, and cost-effective form of actuation, requiring no additional wiring for lamps or concern for lamp life cycles.