Abstract: An endoscope system includes an endoscope, and an insertion auxiliary tool into which the endoscope is inserted. A flexible portion of the insertion section of the endoscope includes, from a distal end side toward a proximal end side, a low flexural rigidity portion, and a flexural rigidity varying portion in which a flexural rigidity increases from the distal end side toward the proximal end side. When at least a part of the flexible portion projects from a distal end opening of the tube body, a position of the proximal end of the low flexural rigidity portion is positioned closer to a proximal end of the insertion auxiliary tool than the distal end opening of the tube body from the proximal end of the insertion auxiliary tool.

Abstract: An endoscope system includes an endoscope, and an insertion auxiliary tool into which the endoscope is inserted. A flexible portion of the insertion section of the endoscope includes, from a distal end side toward a proximal end side, a low flexural rigidity portion, a flexural rigidity varying portion in which a flexural rigidity increases from the distal end side toward the proximal end side, and a high flexural rigidity portion with flexural rigidity higher than that in the low flexural rigidity portion. When at least a part of the flexible portion projects from a distal end opening of the tube body, a position of the proximal end of the low flexural rigidity portion is positioned closer to a proximal end of the insertion auxiliary tool than the distal end opening of the tube body from the proximal end of the insertion auxiliary tool.

Abstract: An endoscope system includes an endoscope, and an insertion auxiliary tool into which the endoscope is inserted. A flexible portion of the insertion section of the endoscope includes, from a distal end side toward a proximal end side, a low flexural rigidity portion, a flexural rigidity varying portion in which a flexural rigidity increases from the distal end side toward the proximal end side, and a high flexural rigidity portion with flexural rigidity higher than that in the low flexural rigidity portion. When at least a part of the flexible portion projects from a distal end opening of the tube body, a position of the proximal end of the low flexural rigidity portion is positioned closer to a proximal end of the insertion auxiliary tool than the distal end opening of the tube body from the proximal end of the insertion auxiliary tool.

Abstract: There is provided an endoscope system which can secure appropriate bending stiffness of an insertion portion while maintaining the slide length of an endoscope insertion portion. According to one aspect of one of the present invention, in an endoscope system including an endoscope and an insertion assisting tool in which the endoscope is inserted and which assists the insertion of an endoscope insertion portion into a body, a flexible portion of the endoscope insertion portion includes a projection region which projects from the distal end opening of a tube body when the endoscope insertion portion is located in the distal end position in a movable range with respect to the tube body of the insertion assisting tool, and the projection region includes a bending stiffness change portion in which bending stiffness increases from a first position on the distal end side to a second position on the proximal end side.

Abstract: An endoscope system includes an endoscope, and an insertion auxiliary tool into which the endoscope is inserted. A flexible portion of the insertion section of the endoscope includes, from a distal end side toward a proximal end side, a low flexural rigidity portion, a flexural rigidity varying portion in which a flexural rigidity increases from the distal end side toward the proximal end side, and a high flexural rigidity portion with flexural rigidity higher than that in the low flexural rigidity portion. When at least a part of the flexible portion projects from a distal end opening of the tube body, a position of the proximal end of the low flexural rigidity portion is positioned closer to a proximal end of the insertion auxiliary tool than the distal end opening of the tube body from the proximal end of the insertion auxiliary tool.

Abstract: An endoscope system includes an endoscope, and an insertion auxiliary tool into which the endoscope is inserted. A flexible portion of the insertion section of the endoscope includes, from a distal end side toward a proximal end side, a low flexural rigidity portion, a flexural rigidity varying portion in which a flexural rigidity increases from the distal end side toward the proximal end side, and a high flexural rigidity portion with flexural rigidity higher than that in the low flexural rigidity portion. When at least a part of the flexible portion projects from a distal end opening of the tube body, a proximal end position of the low flexural rigidity portion is on a proximal end side of the tube body with respect to the distal end opening.

Abstract: There is provided an endoscope system which can secure appropriate bending stiffness of an insertion portion while maintaining the slide length of an endoscope insertion portion. According to one aspect of one of the present invention, in an endoscope system including an endoscope and an insertion assisting tool in which the endoscope is inserted and which assists the insertion of an endoscope insertion portion into a body, a flexible portion of the endoscope insertion portion includes a projection region which projects from the distal end opening of a tube body when the endoscope insertion portion is located in the distal end position in a movable range with respect to the tube body of the insertion assisting tool, and the projection region includes a bending stiffness change portion in which bending stiffness increases from a first position on the distal end side to a second position on the proximal end side.