Medical devices for use with rigid endoscopes, namely, endoscopic sheaths; Medical devices for use with rigid endoscopes, namely, endoscopic sheaths containing a memory chip; Medical devices for use with rigid endoscopes, namely, endoscopic sheaths for imaging, assessing function of, or compiling data regarding the ear, nose, and throat; Medical devices for use with rigid endoscopes, namely, endoscopic sheaths containing computer firmware for gathering and transmitting patient image data for ...