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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1 Newton's cradle, a device that demonstrates conservation of momentum and energy via a series of swinging spheres. 2  Rocker box, a.k.a. a cradle used in mining to separate gold from alluvium.  Cradling (paintings), an art restoration technique to stabilise a painting on panel.