Insertion unit for endoscope
View Patent ↗An insertion unit for an endoscope includes a flexible tube having an inner diameter D 1 and an inner cross-sectional area S, and a plurality of components inserted and arranged in said flexible tube. The plurality of components include at least one optical fiber bundle. The insertion unit is configured such that the inner diameter D 1 is not less than 6.5 mm and the inner cross-sectional area S satisfies the condition of 0.5≦Σs/s≦0.6, where Σs represents a sum of cross-sectional areas of the components arranged in the flexible tube. Alternatively, the insertion unit is configured such that the inner diameter D 1 is less than 6.5 mm and the inner cross-sectional area S satisfies the condition of 0.5≦Σs/s≦0.65.
1. An insertion unit for an endoscope, comprising:
a flexible tube having an inner diameter D 1 and an inner cross-sectional area S; and
a plurality of components inserted and arranged inside said flexible tube inner diameter, said components including an optical fiber bundle,
wherein, said inner diameter D 1 is not less than 6.5 mm and said inner cross-sectional area S satisfies a condition:
0.5≦Σ s/S≦ 0.6
where Σs represents a sum of cross-sectional areas of said components arranged inside said flexible tube inner diameter.
2. The insertion unit according to claim 1 , wherein said inner diameter D 1 is the inner diameter at the narrowest portion of said flexible tube.
3. The insertion unit according to claim 1 , comprising a bendable member connected to said flexible tube, said bendable member being bent with said plurality of components inserted therein, said inner diameter D 1 being the inner diameter in the vicinity of where said bendable member is connected to said flexible tube.
4. An insertion unit of an endoscope, comprising:
a flexible tube having an inner diameter D 1 and an inner cross-sectional area S; and
a plurality of components inserted and arranged inside said flexible tube inner diameter, said components including an optical fiber bundle,
wherein, said inner diameter D 1 is less than 6.5 mm and said inner cross-sectional area S satisfies a following condition:
0.5≦Σ s/S≦ 0.65,
where Σs represents a sum of cross-sectional areas of said components arranged inside said flexible tube inner diameter.
5. The insertion unit according to claim 4 , wherein said inner diameter D 1 is the inner diameter at the narrowest portion of said flexible tube.
6. The insertion unit according to claim 5 , comprising a bendable member connected to a distal end of said flexible tube, said bendable member being bent with said plurality of components inserted therein, said inner diameter D 1 being the inner diameter in the vicinity of a position where said bendable member is connected to said flexible tube.