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 is essentially the opposite of camber. In some circles youâll hear rocker referred to as reverse camber, negative camber, alternate camber or mixed camber; camber is sometimes called positive camber. For years snowboards used cambered designs exclusively, and cambered boards are still a popular choice.