A laryngoscope is an instrument used to examine the larynx and to facilitate intubation of the trachea. The handle usually contains batteries to light a bulb on the blade tip (Figure 19–15), or, alternately, to power a fiberoptic bundle that terminates at the tip of the blade. Light from a fiberoptic bundle tends to be more precisely directed and less diffuse. Also, laryn-goscopes with fiberoptic light bundles in their blades can be made magnetic resonance imaging compat-ible. The Macintosh and Miller blades are the most popular curved and straight designs, respectively, in
the United States. The choice of blade depends on personal preference and patient anatomy. Because no blade is perfect for all situations, the clinician should become familiar and proficient with a variety of blade designs (Figure 19–16).