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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Rocker. Rocker switches are commonly used to directly power a device. They are available in many shapes, sizes and colors, with both standard and custom symbols available on the actuator. Rocker switch illumination may be controlled on a separate circuit, or be dependent on switch position, based on what series is chosen. Available termination options include SMT, PCB pins, solder lugs, screw terminals, and quick connect tabs.