Abstract: A stent delivery system includes: a stent delivery device configured to carry a stent to a stenosis and indwell the stent; an observation device configured to observe the stenosis; and one or more processors comprising hardware, the one or more processors being configured to: acquire an observation image from the observation device, and determine, based on the observation image, at least one insertion position, which is a position within the stenosis where the stent delivery device is recommended to be inserted.

Abstract: A medical system including an endoscope configured to electrically drive an endoscopic operation. The endoscopic operation includes at least one of a forward and backward movement of an insertion section, a bending angle of a bending section of the insertion section, and a rolling rotation of the insertion section, the endoscope being configured to capture an endoscope image. The medical system further includes a processor comprising hardware. The processor is configured to control the endoscopic operation to achieve a second positioning subsequent to a first positioning, the first positioning being where the insertion section is positioned with respect to a papillary portion of a duodenum, the second positioning positions a distal end section of the insertion section with respect to a papillary portion of the duodenum based on the endoscope image.