Endoscope

An endoscope, comprising:

• a controllable curved tube;
• wherein
• an insertion portion of the endoscope is provided with the controllable curved tube;
• the controllable curved tube comprises a plurality of circular tube sections connected in series and a control device configured to control the controllable curved tube to bend;
• a first C-shaped engaging portion is arranged at a first end of each circular tube section of the plurality of circular tube sections;
• wherein the first C-shaped engaging portion belongs to the first circular tube section;
• a first C-shaped notch is arranged around an outside of the first C-shaped engaging portion;
• a second end of each circular tube section is provided with a second C-shaped engaging portion, wherein the second C-shaped engaging portion is engaged with a first C-shaped notch of a second circular tube section of the plurality of circular tube sections;
• an inner side of the second C-shaped engaging portion is provided with a second C-shaped notch and a spherical protrusion, wherein the second C-shaped notch and the spherical protrusion are engaged with a first C-shaped engaging portion of the second circular tube section;
• and the second C-shaped notch surrounds the spherical protrusion;
• when two adjacent circular tube sections of the plurality of circular tube sections are connected in series, a spherical protrusion of a third circular tube section of the two adjacent circular tube sections is engaged inside a first C-shaped engaging portion of a fourth circular tube section of the two adjacent tube sections, and the first C-shaped engaging portion of the fourth circular tube section is inserted into a second C-shaped notch of the third circular tube section, and a second C-shaped engaging portion of the third circular tube section is inserted into a first C-shaped notch of the fourth circular tube section;
• and
• after being engaged, the first C-shaped engaging portion of the fourth circular tube section moves inside the second C-shaped notch of the third circular tube section, and the second C-shaped engaging portion of the third circular tube section moves inside the first C-shaped notch of the fourth circular tube section, wherein a second included angle is formed between a center of an opening direction of the second C-shaped engaging portion and the axial direction of the first circular tube section, wherein the second C-shaped engaging portion belongs to the first circular tube section, and the second included angle ranges from 10° to 90°;
• wherein the first end of each circular tube section is circumferentially provided with two sets of first C-shaped engaging portions and first C-shaped notches opposite to each other, the second end of each circular tube section is circumferentially and oppositely provided with two sets of second C-shaped engaging portions, second C-shaped notches and spherical protrusions, wherein the second C-shaped notches and the spherical protrusions are engaged with the two sets of first C-shaped engaging portions, after being engaged, a gap is formed between the two adjacent circular tube sections, and the gap is arranged to separate the two sets of first C-shaped engaging portions or the two sets of second C-shaped engaging portions;
• and the gap extends along a circumferential direction of each circular tube section;
• and
• wherein at least one groove is arranged on each tube section wall of each of the plurality of circular tube sections located near the gap formed between the two adjacent circular tube sections, the at least one groove extends in the circumferential direction of each circular tube section, and the at least one groove is not contiguous with the gap.

An endoscope, comprising:

• a controllable curved tube;
• Wherein
• an insertion portion of the endoscope is provided with the controllable curved tube;
• the controllable curved tube comprises a plurality of circular tube sections connected in series and a control device configured to control the controllable curved tube to bend;
• a first C-shaped engaging portion is arranged at a first end of each circular tube section of the plurality of circular tube sections;
• wherein the first C-shaped engaging portion belongs to the first circular tube section;
• a first C-shaped notch is arranged around an outside of the first C-shaped engaging portion;
• a second end of each circular tube section is provided with a second C-shaped engaging portion, wherein the second C-shaped engaging portion is engaged with a first C-shaped notch of a second circular tube section of the plurality of circular tube sections;
• an inner side of the second C-shaped engaging portion is provided with a second C-shaped notch and a spherical protrusion, wherein the second C-shaped notch and the spherical protrusion are engaged with a first C-shaped engaging portion of the second circular tube section;
• and the second C-shaped notch surrounds the spherical protrusion;
• when two adjacent circular tube sections of the plurality of circular tube sections are connected in series, a spherical protrusion of a third circular tube section of the two adjacent circular tube sections is engaged inside a first C-shaped engaging portion of a fourth circular tube section of the two adjacent tube sections, and the first C-shaped engaging portion of the fourth circular tube section is inserted into a second C-shaped notch of the third circular tube section, and a second C-shaped engaging portion of the third circular tube section is inserted into a first C-shaped notch of the fourth circular tube section;
• and
• after being engaged, the first C-shaped engaging portion of the fourth circular tube section moves inside the second C-shaped notch of the third circular tube section, and the second C-shaped engaging portion of the third circular tube section moves inside the first C-shaped notch of the fourth circular tube section, wherein a second included angle is formed between a center of an opening direction of the second C-shaped engaging portion and the axial direction of the first circular tube section;
• wherein the first end of each circular tube section is circumferentially provided with two sets of first C-shaped engaging portions and first C-shaped notches opposite to each other, the second end of each circular tube section is circumferentially and oppositely provided with two sets of second C-shaped engaging portions, second C-shaped notches and spherical protrusions, wherein the second C-shaped notches and the spherical protrusions are engaged with the two sets of first C-shaped engaging portions, after being engaged, a gap is formed between the two adjacent circular tube sections, and the gap is arranged to separate the two sets of first C-shaped engaging portions or the two sets of second C-shaped engaging portions;
• and the gap extends along a circumferential direction of each circular tube section;
• and
• wherein at least one groove is arranged on each tube section wall of each of the plurality of circular tube sections located near the gap formed between the two adjacent circular tube sections, the at least one groove extends in the circumferential direction of each circular tube section, and the at least one groove is not contiguous with the gap.