Obturator.

An obturator is a device that is inserted into the tracheostomy tube to guide it through the stoma and prevent tissue damage. It should be removed after the tube is inserted and kept near the bedside in case of accidental decannulation.

Choice A is wrong because povidone-iodine is an antiseptic solution that is not routinely used for tracheostomy care. It can cause skin irritation and damage to the mucous membranes.

Choice C is wrong because an irrigation set is not needed for a tracheostomy tube.

Irrigation can introduce bacteria and increase the risk of infection. It can also cause coughing and bleeding.

Choice D is wrong because hemostats are not used for a tracheostomy tube.

Hemostats are surgical instruments that are used to clamp blood vessels or tissues. They have no role in tracheostomy care.

Some other supplies that the nurse should place in the room are a trach tube the same size as the current tube and one size smaller, a portable suction machine with battery backup, and tubing that connects to the suction machine. Other supplies may include saline solution, syringes, gauze squares, gloves, a trachea tube brush, a waterproof drape, non-woven sponges, pipe cleaners, cotton tipped applicators, a T-drain sponge, twill tape, a trach holder, a speaking valve, a stoma cover, and a nebulizer.