The Insertion Tube

The insertion tube refers to the main body of the endoscope. In the case of the VE, the insertion tube is a flexible tube available in various lengths and diameters. Within the insertion tube is a series of continuous flexible glass fibers that serve to deliver light from an external light source. In conventional endoscopes, additional glass fibers also return the image to an ocular lens at the proximal end. In contrast, the VE has a miniature video camera at its distal tip, eliminating the need for the image return fibers.

Figure 4.8 Gross anatomy of a videoscope: A is the distal tip that houses the camera and lens, B is the insertion tube housing the fiber-optic light guides, and C is the proximal end that houses the various controls.

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