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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Directional Rocker. Directional rocker, also referred to as âearly riseâ or âtip rocker,â is a profile that combines traditional camber underfoot with a more elevated front, or tip, of the ski. This design means the effective edge is going to be slightly shorter than it is on a traditional camber ski of similar length.