Which of the following is a fracture in which the bone is pressed on itself?

If suctioning of the tracheostomy tube is necessary, the EMT should:

A. attach a bag-mask device to the tracheostomy tube and hyperventilate the patient for 2 minutes. B. instill 20 mL of saline into the tracheostomy tube and suction for no longer than 20 seconds. C. attempt to use the patient's suction device first because it is probably already sized correctly. D. insert the suction catheter to a depth of no more than 15-cm and set the suction unit to 140 mm Hg.

Letter D on the figure indicates the ________.