Narcissists believe their personality and appearance is superior to others. Symptoms of narcissism include focusing only on one's self, lacking guilt and an inability to empathize. Narcissistic people tend to be vain. A marriage being undermined by narcissism might benefit from therapy.
Trocar: A sharply pointed shaft, usually with a three-sided point. A trocar may be used within a cannula, a hollow tube, designed to be inserted into a vein, artery, bone marrow or body cavity. The word trocar is derived from the French trois (three) + carre (side). Last Editorial Review: 6/9/2016.
A tracheostomy (trach) tube is a small tube inserted into the tracheostomy to keep the stoma (opening) clear. Tracheostomy tubes are available in several sizes and materials including semi-flexible plastic, rigid plastic or metal. The tubes are disposable or reusable. They may have an inner cannula that is either disposable or reusable.