Endoscope

Abstract

The utility model aims to provide an endoscope capable of improving the cleaning performance of the front end part of an insertion part of the endoscope. The endoscope is provided with a front end part (10) and a rear end part (20), wherein the front end part (10) is provided with an upright table accommodating chamber (28) and a rod accommodating chamber (56); an erecting table (26) accommodated in the erecting table accommodating chamber (28); a rod (54) accommodated in the rod accommodating chamber (56); an operation cable (66) connected to the rod (54); a first partition wall (22) that is provided to the tip section (10) and that partitions the stand housing chamber (28) and the rod housing chamber (56); a rotating shaft (50) connecting the standing table (26) and the rod (54); a through-hole (52) which is provided in the first partition wall (22) and through which the rotating shaft (50) is inserted; and a sealing member (80) that is attached to the rotating shaft (50), seals the through hole when the rotating shaft (50) is inserted through the through hole (52), and is attachable and detachable from the rod housing chamber side.

Description

TECHNICAL FIELD

[0001] The utility model relates to a kind of endoscopes, especially a kind of endoscope with erected platform in the front end of endoscope insertion part. BACKGROUND

[0002] In endoscope, various treatment instruments are inserted from treatment instrument guide inlet provided in operating part, and are exported from treatment instrument guide outlet opening in the front end of insertion part and used for treatment. For example, in duodenoscope, treatment instruments such as guide wire or profiled hose are used. Such treatment instruments need to change export direction in the front end of insertion part in order to treat desired position in examinee's body, so treatment instrument erection mechanism (erected platform) is provided in the front end.

[0003] As treatment instrument erection mechanism, the following mechanism (open type) is known: cable is provided on erected platform and extended to operating part of endoscope, and erected platform is swung around rotation axis by push-pull operation of cable by operating lever provided in operating part, so as to change position between erected position and flat position.

[0004] And, the following mechanism (closed type) is also known: rotation axis of erected platform is connected with rod accommodated through partition, cable is provided on rod, and erected platform is swung around rotation axis by push-pull operation of cable by operating lever of operating part, so as to change position between erected position and flat position.

[0005] The shape and structure of front end part provided with such treatment instrument erection mechanism are complex, so it is required to improve cleaning property based on cleaning liquid.

[0006] In patent document 1, an endoscope provided with closed type treatment instrument erection mechanism is disclosed, which forms cleaning passage between through hole provided in partition and rotation axis inserted through the through hole. According to the endoscope of patent document 1, cleaning liquid flows to cleaning passage and reaches side surface of erected platform, so as to clean rotation axis, through hole and side surface of erected platform.

[0007] Patent document 1: Chinese utility model No. 209951207 specification

[0008] The endoscope of patent document 1 separates erected platform accommodating part and rod accommodating part provided in the front end of endoscope insertion part by partition, and connects erected platform and rod by inserting rotation axis through the through hole provided in partition. And, cleaning passage for flowing cleaning liquid is formed between its through hole and rotation axis.

[0009] Therefore, the endoscope of Patent Literature 1 is likely to have a liquid such as a body fluid, which is immersed in the stand housing portion when the endoscope is used, be immersed in the shaft housing portion via the above-described cleaning passage. Therefore, sometimes the shaft and the cable and the like housed in the shaft housing portion are contaminated by the above-described liquid. In this case, since the shaft and the cable and the like have to be disassembled from the front end portion and cleaned, there is a problem that the cleaning work becomes complicated and complete cleaning is difficult. Utility Model Content

[0010] The present utility model is completed in view of this situation, and aims at providing an endoscope capable of improving the cleaning property of the front end portion of the endoscope insertion portion.

[0011] The endoscope according to a first aspect includes: a front end portion including a stand housing portion and a shaft housing portion; a stand housed in the stand housing portion; a shaft housed in the shaft housing portion; a cable connected to the shaft; a partition wall provided in the front end portion and partitioning the stand housing portion and the shaft housing portion; a rotation shaft connecting the stand and the shaft; a first through-hole provided in the partition wall and through which the rotation shaft is inserted; and a sealing member attached to the rotation shaft and sealing the first through-hole when the rotation shaft is inserted into the first through-hole, and detachable from the shaft housing portion side.

[0012] The endoscope according to a second aspect includes the endoscope according to the first aspect, wherein the shaft includes a second through-hole through which the rotation shaft is inserted.

[0013] The rotation shaft includes a flat edge portion parallel to the axial direction of the rotation shaft and a curved edge portion,

[0014] The curved edge portion is in sliding contact with the inner surfaces of the first through-hole and the second through-hole,

[0015] The edge portion includes a gap portion between the inner surfaces of the first through-hole and the second through-hole,

[0016] The sealing member is fitted in the gap portion.

[0017] The endoscope according to a third aspect includes the endoscope according to the second aspect, wherein the sealing member includes: a base portion fitted so as not to be relatively rotated with the shaft; and a protruding portion protruding from the base portion, the protruding portion being fitted in the gap portion.

[0018] The endoscope according to a fourth aspect includes the endoscope according to the third aspect, wherein the base portion includes a fitting hole fitted so as not to be relatively rotated with the rotation shaft.

[0019] The endoscope according to a fifth aspect includes the endoscope according to the first aspect, wherein the endoscope includes: a first rotation shaft provided on the stand and constituting the rotation shaft; and

[0020] The endoscope according to a sixth aspect includes the endoscope according to the fifth aspect, wherein the endoscope includes: a second rotation shaft provided on the shaft and constituting the rotation shaft,

[0021] A fitting portion is provided on one of the first and second rotation shafts, and a fitted portion that fits with the fitting portion is provided on the other of the first and second rotation shafts.

[0022] In the endoscope according to the sixth aspect, the sealing member is detachable from the second rotation shaft.

[0023] In the endoscope according to the seventh aspect or the sixth aspect, a knob portion is provided on an end portion of the sealing member on the rod accommodating portion side.

[0024] In the endoscope according to the eighth aspect, the sealing member is fixed to the second rotation shaft.

[0025] In the endoscope according to the ninth aspect, the sealing member and the second rotation shaft are formed as one body.

[0026] In the endoscope according to any one of the fifth to seventh aspects, the sealing member has a cylindrical shape through which the first and second rotation shafts are inserted,

[0027] The sealing member has a first flange portion provided on the first rotation shaft side in the axial direction and protruding in a radial direction orthogonal to the axial direction, and a second flange portion provided on the second rotation shaft side in the axial direction and protruding in the radial direction.

[0028] In the endoscope according to the eleventh aspect or the tenth aspect, the first flange portion is disposed in the first through-hole, and the second flange portion is disposed in the rod accommodating portion.

[0029] In the endoscope according to the eleventh aspect or the tenth aspect, the first flange portion is disposed in the first through-hole, and the second flange portion is disposed in the rod accommodating portion.

[0030] In the endoscope according to any one of the first to twelfth aspects, the stand has a third through-hole into which the rotation shaft is inserted,

[0031] The rotation shaft has a side portion that is flat in a circumferential surface parallel to the axial direction of the rotation shaft, and an arc portion that is curved,

[0032] The third through-hole has a hole-side side portion that is opposite to and in contact with the side portion, and a hole-side arc portion that is opposite to the arc portion with a gap therebetween.

[0033] EFFECT OF INVENTION

[0034] According to the present application, the front end portion of the insertion portion of the endoscope can be improved in terms of cleaning. BRIEF DESCRIPTION OF DRAWINGS

[0035] Figure 1This is an assembled three-dimensional diagram showing the structure of the front end of the endoscope insertion section.

[0036] Figure 2 It is a three-dimensional diagram showing the structure of the main body at the front end.

[0037] Figure 3 This is a rough front view of the main body at the front end.

[0038] Figure 4 This is an assembly diagram of the front part of the main body.

[0039] Figure 5 This is a diagram illustrating the action of the standing platform, which is operated by levers.

[0040] Figure 6 It is a 3D view of the standing platform.

[0041] Figure 7 It is an assembly three-dimensional diagram showing the connection structure between the platform and the pole.

[0042] Figure 8 yes Figure 7 The cross-sectional view of the connection structure shown.

[0043] Figure 9 It is a cross-sectional view of the rotating shaft and the through hole on the partition side.

[0044] Figure 10 This is an explanatory diagram of the gaps defined by the through hole and the rotating shaft.

[0045] Figure 11 This is a perspective view of the sealing component installed on the rotating shaft.

[0046] Figure 12 This is the front view of the sealing component.

[0047] Figure 13 It is a cross-sectional view in which three protrusions are embedded in three gaps.

[0048] Figure 14 It is a cross-sectional view of the rotating shaft and the through hole on the side of the standing platform.

[0049] Figure 15 This is a cross-sectional view showing the first modified example of the connection structure between the platform and the rod.

[0050] Figure 16 yes Figure 15 A three-dimensional view of the sealing components used in the connection structure.

[0051] Figure 17 yes Figure 16 Front view of the base of the sealing component shown.

[0052] Figure 18 yesFigure 15 side view of the rod.

[0053] Figure 19 is a sectional view showing a second modification of the connection structure of the riser and the rod.

[0054] Figure 20 is Figure 19 a perspective view of a sealing member employed in the connection structure of

[0055] Figure 21 is a sectional view showing a main part structure of the front end portion involved in the second embodiment.

[0056] Figure 22 is Figure 21 an assembled perspective view of the connection structure shown in

[0057] Figure 23 is a sectional view showing that the sealing member is fixed to the rod-side rotary shaft with an adhesive.

[0058] Figure 24 is a sectional view showing that the sealing member and the rod-side rotary shaft are formed of an integral product.

[0059] Symbol Explanation

[0060] 10 - tip portion, 12 - insertion portion, 14 - bent portion, 16 - cylindrical member, 20 - tip portion main body, 22 - first partition wall, 24 - second partition wall, 24A - tip surface, 26 - stand, 28 - stand housing chamber, 30 - opening, 32 - treatment instrument insertion passage, 32A - treatment instrument guide outlet, 50 - rotation shaft, 50A - shaft, 50B - side portion, 50C - arc portion, 52 - through hole, 52A - inner surface, 53 - void portion, 53A - void side portion, 53B - void side arc portion, 54 - rod, 56 - rod housing chamber, 58 - housing chamber, 60 - irradiation window, 62 - observation window, 64 - air / water feeding nozzle, 66 - operation cable, 68 - connecting portion, 70 - outlet, 71 - cable insertion path, 72 - through hole, 72B - hole side portion, 72C - hole side arc portion, 74 - through hole, 74A - inner surface, 75 - void portion, 77 - void portion, 80 - seal member, 80A - shaft, 82 - base portion, 84 - protrusion, 84A - protrusion side portion, 84B - protrusion side arc portion, 86 - slit, 88 - shaft housing space, 100 - tip cover, 102 - open portion, 180 - seal member, 182 - base portion, 184 - fitting hole, 186 - fitting hole, 200 - cover, 202 - opening window, 280 - seal member, 282 - base portion, 284 - fitting hole, 300 - tip portion, 302 - stand side rotation shaft, 302A - outer surface, 304 - rod side rotation shaft, 306 - prismatic portion, 308 - angular hole portion, 310 - rotation shaft, 320 - seal member, 320A - shaft, 322 - cylindrical portion, 322A - inner surface, 324 - flange portion, 326 - flange portion, 330 - adhesive, 332 - integral product, Ax - long axis, G - guide surface. DETAILED DESCRIPTION

[0061] Hereinafter, an endoscope according to an embodiment of the present application will be described.

[0062] In the embodiment, a side-viewing endoscope used as a duodenoscope is exemplified. The endoscope includes an operation portion operated by a doctor, and an endoscope insertion portion connected to the operation portion and inserted into a subject.

[0063] The insertion portion is inserted into the subject through the mouth, and further inserted into the duodenum from the esophagus through the stomach. Thus, a prescribed examination or treatment of the duodenum, or the like, is performed using a treatment instrument inserted into the insertion portion.

[0064] As the treatment instrument, a biopsy forceps having a cup capable of collecting living tissue at a tip portion thereof, an EST (Endoscopic Sphincterotomy) knife, a contrast tube, or the like can be exemplified.

[0065] [First Embodiment]

[0066] Figure 1 is an assembled perspective view showing the structure of the front end portion 10 according to the first embodiment. The front end portion 10 is provided on the front end side of the insertion portion 12. In addition, the front end portion 10 is an example of the front end portion of the present application.

[0067] The insertion portion 12 has a long axis Ax extending from the base end side to the front end side where the operation portion is connected. The insertion portion 12 has, in order from the base end side to the front end side, a soft portion, a curved portion 14, and the front end portion 10.

[0068] The curved portion 14 is configured as a cylindrical member 16 having a notch portion provided in the circumferential direction so as to be capable of bending. A mesh body woven by metal wires is covered on the outer periphery of the cylindrical member 16, and further, a rubber outer skin is covered. A plurality of cables extend from the elbow knob of the operation portion to the curved portion 14, and the front end portions of these cables are fixed to the cylindrical member 16 configuring the curved portion 14. Thus, the curved portion 14 is bent up and down and left and right by the operation of the elbow knob.

[0069] The front end portion 10 has a front end portion main body 20, a front end cover 100 detachably attached to the front end portion main body 20, and a cover 200 attached to the outer side of the front end cover 100.

[0070] The front end cover 100 has, in a state of being attached to the front end portion main body 20, an opening portion 102 that opens the opening 30 on the upper side of the later-described standing table housing chamber 28 (refer to Figure 3 ). The front end cover 100 is made of a metal material having corrosion resistance.

[0071] In addition, the cover 200 has, in a state of being attached to the front end portion main body 20, an opening window 202 that opens the opening 30. The cover 200 has, on the base end side thereof, an engagement portion that engages with a groove formed in the front end portion main body 20, and is detachably attached to the front end portion main body 20. The cover 200 is made of a material having elasticity or a soft material such as silicone rubber or polyethylene.

[0072] Figure 2 is a perspective view of the front end portion main body 20. Figure 3 is a schematic front view of the front end portion main body 20.

[0073] As shown in Figure 2 and Figure 3 , the front end portion main body 20 has, as a part thereof, a pair of a first partition wall 22 and a second partition wall 24 that face each other. A standing table housing chamber 28 is formed between the first partition wall 22 and the second partition wall 24, and is a slit-like space that houses a standing table 26 (not shown in Figure 3 ). The standing table housing chamber 28 has Figure 2The upper side opening is formed as the opening 30. The front end portion main body 20 is made of a metal material having corrosion resistance. Further, the stand 26 and the stand housing chamber 28 are one example of a stand and a stand housing portion of the present application.

[0074] Further, a treatment instrument insertion passage 32 is communicated in the stand housing chamber 28 of the front end portion main body 20. The treatment instrument insertion passage 32 is inserted in the insertion portion 12 and connected to the treatment instrument guide inlet of the operation portion. Thus, the treatment instrument introduced from the treatment instrument guide inlet is guided to the stand housing chamber 28 through the treatment instrument insertion passage 32.

[0075] The stand 26 is provided to the front end portion main body 20 and housed in the stand housing chamber 28. The stand 26 makes the treatment instrument guided to the stand housing chamber 28 from the treatment instrument guide outlet 32A which is the front end opening of the treatment instrument insertion passage 32, and protrude from the opening 30. The stand 26 is swingably provided to the through hole 52 of the first partition wall 22 via the rotation shaft 50 (refer to Figure 4 ) described later, and can control the guide direction of the treatment instrument when guiding the treatment instrument from the treatment instrument guide outlet 32A.

[0076] A concave rod housing chamber 56 housing a rod 54 is formed on the opposite surface of the first partition wall 22 on the side opposite to the opposite surface side to the stand housing chamber 28. That is, the front end portion 10 has the stand housing chamber 28 and the rod housing chamber 56. Further, the first partition wall 22 is provided to the front end portion 10 to partition the stand housing chamber 28 and the rod housing chamber 56. Further, the rod 54, the rod housing chamber 56 and the first partition wall 22 are one example of a rod, a rod housing portion and a partition wall of the present application.

[0077] A housing chamber 58 housing an optical system or the like is provided in the second partition wall 24. An irradiation window 60, an observation window 62 and an air / water supply nozzle 64 facing the observation window 62 are provided in the upper portion of the housing chamber 58. The air / water supply nozzle 64 is connected to an air / water supply device via an air / water supply hose inserted in the insertion portion 12. By operating an air / water supply button of the operation portion, air or water is sprayed from the air / water supply nozzle 64 toward the observation window 62, thereby cleaning the observation window 62.

[0078] Further, an illumination portion and a photographing portion are housed in the second partition wall 24. The illumination portion is provided with an illumination lens provided on the inner side of the irradiation window 60 and a light guide member arranged so as to face the illumination lens with the front end surface. The light guide member is inserted in the insertion portion 12, and the base end portion thereof is connected to a light source device. Thus, irradiation light from the light source device is transmitted via the light guide member and irradiated from the irradiation window 60.

[0079] The photographing section has a photographing optical system and a CMOS (complementary metal oxide semiconductor) or CCD (Charge Coupled Device) type imaging element provided inside the observation window 62. The imaging element is connected to the image processing device via a signal cable inserted into the insertion section 12. An imaging signal of a subject image obtained by photographing based on the photographing section is input to the image processing device via the signal cable, so that the subject image is displayed on a monitor connected to the image processing device.

[0080] Figure 4 is an assembled perspective view of the front end section main body 20. In addition, in Figure 4 , the illustration of the lever 54 is omitted, and the rotation shaft 50 connected to the lever 54 is shown.

[0081] As shown in Figure 4 , a through hole 52 that penetrates the first partition wall 22 and communicates with the stand-up table accommodating chamber 28 is provided on the bottom surface of the concave lever accommodating chamber 56. The rotation shaft 50 that links the stand-up table 26 and the lever 54 is inserted through the through hole 52. That is, the through hole 52 through which the rotation shaft 50 is inserted is provided in the first partition wall 22. The lever 54 in the lever accommodating chamber 56 swings around the rotation shaft 50, and thus the lever accommodating chamber 56 is formed in a substantially sector shape around the rotation shaft 50. In addition, the rotation shaft 50 and the through hole 52 are one example of the rotation shaft and the first through hole of the present application.

[0082] One end side of the lever 54 is linked to the stand-up table 26 via the rotation shaft 50, and the other end side is connected to an operation cable 66, the detailed structure of which will be described later. By operating the operation cable 66, the lever 54 and the stand-up table 26 swing integrally around the rotation shaft 50.

[0083] As shown in Figure 2 , the operation cable 66 has a connection portion 68 at the front end side thereof, which is connected to the lever 54 in the lever accommodating chamber 56. Also, the base end side of the operation cable 66 passes through a cable insertion passage 71 from an outlet 70 that is opened to the wall surface of the lever accommodating chamber 56, so as to be linked to the stand-up table operation mechanism in the operation section. In addition, the operation cable 66 is one example of the cable of the present application.

[0084] Figure 5 VA and VB of are explanatory diagrams that explain the operation of the stand-up table 26 that operates by the operation of the lever 54.

[0085] As shown in Figure 5 , if a push operation is performed on the operation cable 66 by the operation of the lever, the lever 54 swings around the rotation shaft 50 in the A direction, and the stand-up table 26 operates from the stand-up position toward the lying position. On the other hand, as shown inFigure 5 As shown in FIG. 26, if the operating cable 66 is pulled by the operation of the operating lever, the lever 54 swings in the direction B (the direction opposite to the direction A) around the rotation shaft 50, and the stand 26 moves from the lying position toward the standing position. Thus, the operating cable 66 can rotate the rotation shaft 50 via the lever 54 by the operation of the operating lever. As a result, the position of the stand 26 is changed between the standing position and the lying position.

[0086] Figure 6 FIG. 27 is an external perspective view of the stand 26 housed in the stand housing chamber 28.

[0087] As shown in FIG. 26, the stand 26 has a guide surface G in a circular arc shape. The guide surface G faces the instrument guide outlet 32A of the instrument insertion passage 32 in the stand housing chamber 28, and guides the instrument guided from the instrument guide outlet 32A into the stand housing chamber 28 toward the opening 30. Figure 6

[0088] The stand 26 has a through-hole 72 into which the rotation shaft 50 is inserted at the proximal end portion thereof. The stand 26 is coupled to the lever 54 via the rotation shaft 50 by the insertion of the rotation shaft 50 into the through-hole 72. The rotation shaft 50 and the through-hole 72 will be described later.

[0089] Here, the front end portion 10 of the insertion portion 12 is a component exposed to a liquid such as a body fluid when the endoscope is used. Therefore, sometimes the liquid flows from the stand housing chamber 28 into the through-hole 52 of the first partition wall 22 and is immersed into the lever housing chamber 56. In this case, the rotation shaft 50, the through-hole 52, the lever 54, and the like are contaminated with the liquid, and thus these components must be cleaned. However, since these components are small and have a complicated shape, it is difficult to completely clean them.

[0090] Therefore, the front end portion 10 of the first embodiment has the following structure (coupling structure) to improve the cleanability of the front end portion 10 by eliminating the above-described problem of cleanability.

[0091] <Structure of Coupling Stand and Lever>

[0092] Figure 7 FIG. 28 is an assembled perspective view showing the coupling structure of the stand 26 and the lever 54. Figure 8 is a sectional view of the coupling structure shown in FIG. 26. Figure 7

[0093] <Rotation Shaft>

[0094] ​​First, the rotating shaft 50 will be described. The rotating shaft 50 has a side portion 50B that is flat in a circumferential surface thereof in parallel with the shaft 50A direction of the rotating shaft 50 and an arc portion 50C that is curved. If described in detail, the rotating shaft 50 has a substantially triangular prism shape in which the side portion 50B and the arc portion 50C are alternately formed at three positions in the circumferential direction of the rotating shaft 50 and extend in the shaft 50A direction. Note that the rotating shaft 50, the side portion 50B, and the arc portion 50C are one example of the rotating shaft, the side portion, and the arc portion of the present application.

[0095] When the rotating shaft 50 is inserted into the through-hole 52 in order to connect the stand 26 and the rod 54, as shown in a cross-sectional view of the rotating shaft 50 and the through-hole 52, Figure 9 the arc portion 50C of the rotating shaft 50 is in sliding contact with the inner surface 52A of the through-hole 52 that is a circular hole, but the side portion 50B of the rotating shaft 50 is not in contact with the inner surface 52A. Therefore, a gap portion 53 is formed between the side portion 50B and the inner surface 52A. In this example, the gap portion 53 is formed at three positions in the circumferential direction of the rotating shaft 50. Note that the gap portion 53 is one example of the gap portion of the present application.

[0096] Figure 10 is a view for describing the gap portion 53 between the side portion 50B of the rotating shaft 50 and the inner surface 52A of the through-hole 52.

[0097] As shown in Figure 10 , the gap portion 53 is a space portion divided by the side portion 50B and the inner surface 52A and has a substantially semicircular shape having a gap side portion 53A along the side portion 50B and a gap side arc portion 53B along the inner surface 52A.

[0098] The gap portion 53 thus formed becomes a flow path of fluid from the stand housing chamber 28 toward the rod housing chamber 56, and therefore, in order to improve the cleanability of the front end portion 10, it is necessary to seal the through-hole 52 by closing the gap portion 53. Therefore, in the front end portion 10 of the first embodiment, in the connection structure of the stand 26 and the rod 54, a sealing member 80 for sealing the through-hole 52 is provided (see Figure 11 ). Hereinafter, the sealing member 80 will be described.

[0099] <Sealing member>

[0100] Figure 11 is an enlarged perspective view of the sealing member 80 mounted on the rotating shaft 50 shown in Figure 7 and Figure 8 .

[0101] As shown in Figure 11As shown, the sealing member 80 is configured as a generally cylindrical shape having a shaft 80A. The sealing member 80 includes a base 82 and three protrusions 84 projecting from the base 82. As will be described later, the three protrusions 84 are configured to be able to be inserted into... Figure 10 The three gaps 53 shown are used for sealing. The sealing component 80 is made of plastics such as PTFE (polytetrafluoroethylene) or rubbers such as fluororubber and silicone rubber. Furthermore, the sealing component 80 is an example of the sealing component of this utility model.

[0102] In detail, the base 82 of the sealing member 80 is configured as a disc. Three protrusions 84 protrude parallel to each other from the base 82 along the axis 80A. The outer peripheral surfaces of the base 82 and the three protrusions 84 are flush and have no height difference. The three protrusions 84 are configured as plates extending from the outer peripheral surface of the base 82 along the axis 80A. Furthermore, the three protrusions 84 protrude at equal intervals in the circumferential direction around the axis 80A via three slits 86 along the axis 80A.

[0103] Figure 12 This is the front view of the sealing component 80 when viewed from the direction of axis 80A.

[0104] like Figure 12 As shown, the sealing member 80 has a shaft receiving space 88 surrounded by three protrusions 84. The rotating shaft 50 is received in the shaft receiving space 88. In this case, the rotating shaft 50 is received with its shaft 50A aligned with the shaft 80A of the sealing member 80. Thus, the sealing member 80 is mounted on the rotating shaft 50.

[0105] The protrusion 84 has a protruding side edge portion 84A that contacts the edge portion 50B of the rotation shaft 50 on its inner periphery and a protruding side arc portion 84B that slides in contact with the inner surface 52A of the through hole 52 on its outer periphery. Thus, the protrusion 84 is formed to have a protruding side arc portion 84A that contacts the edge portion 50B of the rotation shaft 50 on its inner periphery and a protruding side arc portion 84B that slides in contact with the inner surface 52A of the through hole 52 on its outer periphery. Thus, the protrusion 84 is formed to have a protruding side edge portion 84A that contacts the edge portion 50B of the rotation shaft 50 on its inner periphery and a protruding side arc portion 84B that slides in contact with the inner surface 52A of the through hole 52 on its outer periphery. Figure 10 The protruding side portion 84A of the gap side portion 53A and the protruding side arc portion 84B along the gap side arc portion 53B are approximately crescent-shaped.

[0106] Due to the shape of this protrusion 84, it can be inserted into the gap 53. Therefore, when the rotating shaft 50 is inserted into the through hole 52, the three protrusions 84 of the sealing member 80 mounted on the rotating shaft 50 are respectively inserted into the three gaps 53. Figure 13 The figure shows a cross-sectional view in which three protrusions 84 are embedded in three gaps 53 respectively.

[0107] Thus, the three gaps 53 are respectively closed by the three protrusions 84, thereby sealing the through hole 52. Therefore, the flow of fluid from the stand-up table receiving chamber 28 toward the rod receiving chamber 56 can be blocked by the sealing member 80.

[0108] On the other hand, such as Figure 8 As shown, rod 54 also has a through hole 74. A sealing member 80, mounted on the rotating shaft 50, is inserted into the through hole 74. The through hole 74 has a slightly smaller inner diameter than the through hole 52. The configuration relationship between the rotating shaft 50 and the through hole 74 is as described above; although the inner diameters differ, they are consistent. Figure 9 The arrangement of the rotating shaft 50 and the through hole 52 shown is approximately the same.

[0109] Therefore, the configuration relationship between the rotating shaft 50 and the through hole 74 is used together. Figure 9 Please provide an explanation. For example... Figure 9 As shown, the arcuate portion 50C of the rotating shaft 50 slides in contact with the inner surfaces 52A and 74A of the through holes 52 and 74, respectively. Furthermore, gaps 53 and 75 are provided between the edge portion 50B of the rotating shaft 50 and the inner surfaces 52A and 74A of the through holes 52 and 74, respectively. Then, the three protrusions 84 of the sealing member 80 are embedded in the gaps 53 and 75. Additionally, the through hole 74 is an example of the second through hole of this invention.

[0110] In this example, the connection structure, with the sealing member 80 included, temporarily transmits the rotational (oscillating) force of the rod 54 to the sealing member 80 and from the sealing member 80 to the rotating shaft 50. Therefore, in this example connection structure, to transmit the rotational force of the rod 54 to the rotating shaft 50, for example, the rod 54 (through hole 74) and the sealing member 80 (protrusion 84) are fitted with a non-rotatable dimensional relationship (interference fit). Thus, since relative free rotation between the rod 54 and the sealing member 80 can be prevented, the rotational force of the rod 54 can be transmitted to the rotating shaft 50 via the sealing member 80. Furthermore, on the through hole 52 side, to ensure smooth rotation of the rotating shaft 50 (including the sealing member 80) relative to the through hole 52, the inner surface 52A of the through hole 52 can be coated with a lubricating material, or a lubricant can be filled between the inner surface 52A and the sealing member 80.

[0111] Next, the connection sequence between the standing platform 26 and the rod 54 based on the connection structure of this example will be explained. First, a sealing member 80 is installed on the rotating shaft 50. Next, the sealing member 80 is installed in the through hole 74 of the rod 54. Then, while installing the sealing member 80 into the through hole 52 from the rod receiving chamber 56 side, the rotating shaft 50 is inserted through the through hole 52, and the rotating shaft 50 passing through the through hole 52 is inserted into the through hole 72 of the standing platform 26. Through this sequence, the standing platform 26 and the rod 54 can be connected.

[0112] In addition, as other connection sequences, the following two connection sequences are illustrated. In the first alternative connection sequence, firstly, the rotating shaft 50 is inserted through the through hole 52 and then into the through hole 72. Next, the rotating shaft 50 is inserted into the through hole 74. In this state, the sealing member 80 is installed in the through hole 74 and the through hole 52 from the rod 54 side. The standing platform 26 and the rod 54 can also be connected in this sequence. In the second alternative connection sequence, firstly, the standing platform 26 is accommodated in the standing platform accommodating chamber 28, and the rotating shaft 50 is inserted through the through hole 52 and then into the through hole 72 from the rod accommodating chamber 56 side, thereby setting and fixing the rotating shaft 50 to the standing platform 26. Then, the rotating shaft 50 is inserted into the through hole 74 and the rod 54 is set on the rotating shaft 50, while the rod 54 is accommodated in the rod accommodating chamber 56. Finally, with the rod 54, rotating shaft 50, and standing platform 26 assembled, the sealing component 80 is installed into the through hole 74 and through hole 52 from the rod 54 side. The standing platform 26 can also be connected to the rod 54 in this sequence.

[0113] Next, the separation sequence of the standing platform 26 and the rod 54 based on the connection structure of this example will be explained. First, the rod 54 is removed from the rod receiving chamber 56 side. Thus, the sealing member 80 and the rod 54 are also removed from the rod receiving chamber 56 side. Then, the rotating shaft 50 is removed from the rod receiving chamber 56 side. Through this sequence, the standing platform 26 and the rod 54 can be separated. That is, the sealing member 80 in this example can be freely installed and removed from the rod receiving chamber 56 side. Then, if the separation operation is completed, the inner surface 52A of the through hole 52 is exposed, and therefore cleaning of the inner surface 52A based on cleaning fluid can be performed.

[0114] Next, the connection structure between the rotating shaft 50 and the erecting platform 26 will be explained. For example... Figure 7 As shown, the standing platform 26 has a through hole 72 for inserting the rotating shaft 50. As described above, a side portion 50B and an arc portion 50C are formed on the rotating shaft 50.

[0115] Figure 14 This is a cross-sectional view of the rotating shaft 50 and the through hole 72.

[0116] like Figure 14 As shown, the through hole 72 has a hole-side edge portion 72B that is opposite to and contacts the edge portion 50B, and a hole-side arc portion 72C that is opposite to the arc portion 50C across the gap portion 77. Furthermore, the through hole 72, the hole-side edge portion 72B, and the hole-side arc portion 72C are examples of the third through hole, hole-side edge portion, and hole-side arc portion of this utility model.

[0117] According to the above-described coupling structure, since the edge portion 50B of the rotating shaft 50 and the hole-side edge portion 72B of the through-hole 72 are in contact with each other, the rotational force transmitted from the rod 54 to the rotating shaft 50 can be transmitted to the stand 26. Also, since the gap portion 77 formed between the arc portion 50C and the hole-side arc portion 72C can be used as a cleaning passage for the cleaning liquid to pass through, the cleaning property of the arc portion 50C and the hole-side arc portion 72C exposed to the gap portion 77 can be improved.

[0118] As described above, according to the front end portion 10 of the first embodiment, the sealing member 80 is attached to the rotating shaft 50 that couples the stand 26 and the rod 54, and the through-hole 52 is sealed by the sealing member 80 when the rotating shaft 50 is inserted through the through-hole 52, so that the liquid such as the body fluid can be prevented from being immersed into the rod housing chamber 56 from the through-hole 52. Also, since the sealing member 80 is detachable from the rod housing chamber 56 side, the inner surface 52A of the through-hole 52 can be cleaned with the cleaning liquid. Thus, the cleaning property of the front end portion 10 can be improved.

[0119] <Modification Example>

[0120] Next, several modification examples (first modification example and second modification example) related to the front end portion 10 of the first embodiment will be described. In describing the modification examples, the same symbols are used to describe the same or similar components as those of the first embodiment.

[0121] <First Modification Example>

[0122] Figure 15 is a cross-sectional view that shows the first modification example in the coupling structure of the stand 26 and the rod 54. Figure 16 is a perspective view of a sealing member 180 applied to the coupling structure of Figure 15 .

[0123] As shown in Figure 15 and Figure 16 , the sealing member 180 has a base portion 182 and three protruding portions 84 protruding from the base portion 182. These three protruding portions 84 are respectively inserted into the three gap portions 53 shown in Figure 10 , thereby sealing the through-hole 52. This is the same as the sealing member 80 of the first embodiment.

[0124] The sealing member 180 differs from the sealing member 80 in that the base portion 82 of the sealing member 80 is a disc shape, and in contrast, the base portion 182 of the sealing member 180 is formed into a polygonal shape (octagonal shape in this example) in a front view observed in the direction of an axis 180A shown in Figure 17 , and the base portion 182 of the sealing member 180 has substantially triangular insertion holes 184 into which the rotating shaft 50 can be inserted. In addition, in Figure 17In order to distinguish between the base 182 and the protrusion 84, the protrusion 84 is shown in cross-section.

[0125] like Figure 18 As shown in the side view of the rod 54, the base 182 fits into the fitting hole 186 formed in the rod 54. The fitting hole 186 is formed on the opposite side of the rod 54 and the side opposite to the opposing side of the first partition wall 22 and communicates with the through hole 74.

[0126] Similar to the base 182, the fitting hole 186 is formed as a polygon (octagon). By fitting the base 182 into the fitting hole 186, the sealing member 180 and the rod 54 are connected in a way that prevents relative rotation. That is, the sealing member 180 has a base 182 that fits into the rod 54 and cannot rotate relative to it. Furthermore, the base 182 is an example of the base of this invention.

[0127] Furthermore, the end of the rotating shaft 50 on the rod 54 side is fitted into the fitting hole 184 of the base 182. That is, the base 182 has a fitting hole 184 that fits in such a way that it cannot rotate relative to the rotating shaft 50. In addition, the fitting hole 184 is an example of the fitting hole of this utility model.

[0128] According to the first modified embodiment of the sealing member 180, the base 182 of the sealing member 180 engages with the fitting hole 186 of the rod 54, and the rotating shaft 50 engages with the fitting hole 184 of the base 182, thus enabling reliable transmission of the rotational force of the rod 54 to the sealing member 180 and the rotating shaft 50. Furthermore, like the sealing member 80, the sealing member 180 can be installed and removed from the rod receiving chamber 56 side.

[0129] When the base 182 is made of metal and the protrusion 84 is made of resin or rubber, the sealing member 180 can be manufactured using a known insert molding method. By making the base 182 of metal, the strength of the base 182 can be increased, and by making the protrusion 84 of resin or rubber, the tightness of the protrusion 84 with the through holes 52 and 74 can be improved.

[0130] <Second Variation>

[0131] Figure 19 This is a cross-sectional view showing the second variation of the connection structure between the erecting platform 26 and the rod 54. Figure 20 It is applied to Figure 19 A perspective view of the sealing component 280 of the connecting structure.

[0132] like Figure 19 and Figure 20 As shown, the sealing member 280 has a base 282 and three protrusions 84 protruding from the base 282. These three protrusions 84 are respectively embedded in... Figure 10Of the three clearance portions 53 shown, the through hole 52 is thus sealed. This is the same as the sealing member 80 of the first embodiment.

[0133] As shown in Figure 19 The first embodiment differs from the structure of the second modification example in that the rod 54 does not have the through hole 74 (refer to Figure 8 ), but rather in that it has an insertion hole 284 that is inserted into the rotary shaft 50 in place of the through hole 74, and in that the base 282 of the sealing member 280 is disposed in the gap between the first partition wall 22 and the rod 54, as opposed to the base 82 of the sealing member 80 being disposed so as to pass through the through hole 74.

[0134] The insertion hole 284 is formed in a substantially triangular shape corresponding to the cross-sectional shape of the rotary shaft 50. The end portion of the rod 54 of the rotary shaft 50 is inserted into this insertion hole 284. That is, the rod 54 is provided with the insertion hole 284 that cannot rotate relative to the rotary shaft 50.

[0135] According to the second modification example that is provided with such a rod 54, since the rotary shaft 50 is inserted into the insertion hole 284, the rotational force of the rod 54 can be reliably transmitted to the rotary shaft 50. Also, the sealing member 280 can be attached from the rod housing chamber 56 side together with the rod 54. Also, by detaching the rod 54 from the rod housing chamber 56 side, the sealing member 280 can be detached from the rod housing chamber 56 side. In this case, the base 282 exposed in the rod housing chamber 56 is gripped, and the sealing member 280 is detached from the through hole 52. That is, the sealing member 280 can be attached and detached from the rod housing chamber 56 side.

[0136] In addition, in the first embodiment (including the first and second modification examples), the sealing members 80, 180, 280 that have three protrusions 84 corresponding to the shape of the substantially triangular prism-shaped rotary shaft 50 were described, but are not limited thereto.

[0137] For example, when the rotary shaft 50 is a semi-cylindrical shape, the protrusions 84 can be formed in a semi-cylindrical shape. This protrusion 84 becomes a protrusion in which one edge portion and one arc portion are formed. Also, when the rotary shaft 50 is a cylindrical shape, the protrusions 84 can be formed in a tubular shape. In any case, the above-described (semi-cylindrical shape and cylindrical shape) protrusions 84 can be inserted into the clearance portion formed between the outer circumferential surface of the rotary shaft 50 and the inner surface 52A of the through hole 52. Thereby, the through hole 52 can be sealed. In addition, in the through hole 72 on the stand 26 side, as long as it is formed in a shape (semi-circle, circular hole) and size that can be inserted in a dimension relationship (amount of interference) in which it cannot rotate relative to the above-described (semi-cylindrical shape and cylindrical shape) rotary shaft 50.

[0138] [Second Embodiment]

[0139] Next, the second embodiment will be described. In describing the second embodiment, the same reference numerals are used to describe the same or similar components as those of the first embodiment.

[0140] Figure 21 is a sectional view showing the main part structure of the front end portion 300 according to the second embodiment, and in particular, the connecting structure of the stand 26 and the shaft 54 is shown in a sectional view. Also, Figure 22 is Figure 21 an assembled perspective view of the connecting structure shown in

[0141] The first and second embodiments have in common that a rotation shaft connecting the stand 26 and the shaft 54 is provided, and that a through hole 52 through which the rotation shaft is inserted is sealed by a sealing member, but the structures of the rotation shaft and the sealing member are different. Hereinafter, the differences will be described.

[0142] First, the rotation shaft will be described. The rotation shaft 50 of the first embodiment adopts a connecting structure in which one rotation shaft 50 connects the stand 26 and the shaft 54. In contrast, in the second embodiment, a connecting structure in which two rotation shafts are connected to each other to constitute one rotation shaft, and the stand 26 and the shaft 54 are connected by the one rotation shaft is adopted.

[0143] Specifically, as shown in Figure 21 and Figure 22 in the second embodiment, a stand-side rotation shaft 302 is provided on the stand 26, and a shaft-side rotation shaft 304 is provided on the shaft 54. In this example, the stand 26 and the stand-side rotation shaft 302 are formed as one body, and the shaft 54 and the shaft-side rotation shaft 304 are also formed as one body. In addition, the stand-side rotation shaft 302 and the shaft-side rotation shaft 304 are examples of the first and second rotation shafts of the present application.

[0144] A prismatic portion 306 having a smaller diameter than the shaft-side rotation shaft 304 is provided protruding on the shaft-side rotation shaft 304. The prismatic portion 306 is a columnar body having an octagonal shape, and is provided coaxially with the shaft-side rotation shaft 304. That is, the shaft-side rotation shaft 304 having the prismatic portion 306 is provided on the shaft 54 in the second embodiment. In addition, the prismatic portion 306 is an example of the fitting portion of the present application.

[0145] On the other hand, an angular hole portion 308 that fits with the prismatic portion 306 is provided on the stand-side rotation shaft 302. The angular hole portion 308 is a bottomed hole having an octagonal shape, and is provided coaxially with the stand-side rotation shaft 302. That is, the stand-side rotation shaft 302 having the angular hole portion 308 is provided on the stand 26 in the second embodiment. In addition, the angular hole portion 308 is an example of the fitted portion of the present application.

[0146] According to the coupling structure of the second embodiment thus configured, if the stand-side rotary shaft 302 and the lever-side rotary shaft 304 are inserted into the through-hole 52 from both sides of the first partition wall 22 sandwiching the through-hole 52, the prism portion 306 and the corner hole portion 308 are fitted to each other. Thus, the stand 26 and the lever 54 are coupled by one rotary shaft 310 configured by the stand-side rotary shaft 302 and the lever-side rotary shaft 304, and the rotational force of the lever 54 can be transmitted to the stand 26 via the rotary shaft 310.

[0147] Next, the sealing member will be described. The sealing member 80 of the first embodiment adopts a sealing structure in which the protruding portion 84 provided to the base portion 82 is fitted into the clearance portion 53 formed in the through-hole 52, thereby sealing the through-hole 52.

[0148] In contrast, the sealing member 320 of the second embodiment is provided with a cylindrical portion 322 inserted into the through-hole 52 and flange portions 324 and 326 provided to both sides of the cylindrical portion 322. Further, a sealing structure is adopted in which the flange portion 324 is located inside the through-hole 52 and the flange portion 326 is located in the lever housing chamber 56, thereby sealing the through-hole 52.

[0149] A detailed description will be given. The sealing member 320 has the cylindrical portion 322 having a cylindrical shape through which the stand-side rotary shaft 302 and the lever-side rotary shaft 304 are inserted. The outer surface 302A of the stand-side rotary shaft 302 is in sliding contact with the inner surface 322A of the cylindrical portion 322.

[0150] Further, the sealing member 320 has the flange portion 324. The flange portion 324 is provided to the stand-side rotary shaft 302 side and protrudes in a radial direction orthogonal to the shaft 320A direction. Further, the sealing member 320 has the flange portion 326. The flange portion 326 is provided to the lever-side rotary shaft 304 side and protrudes in the above-described radial direction. Further, the flange portion 326 is formed to have a larger diameter than the flange portion 324.

[0151] Further, the flange portion 324 is located inside the through-hole 52, and the outer peripheral surface 324A of the flange portion 324 is in contact with the inner surface 52A of the through-hole 52. Further, the flange portion 326 is located in the lever housing chamber 56 and is in contact with the bottom portion 56A of the lever housing chamber 56. Further, a knob portion 328 is provided to protrude on the end portion 326A of the flange portion 326 on the lever housing chamber 56 side of the sealing member 320. The knob portion 328 protrudes toward the lever housing chamber 56 side. In addition, the flange portion 324, the flange portion 326, and the knob portion 328 are one example of the first flange portion, the second flange portion, and the knob portion of the present application.

[0152] <Method of installing the sealing member in the through-hole>

[0153] The sealing member 320 is pushed into the through-hole 52 from the flange portion 324 side of the rod accommodating chamber 56. Thus, the sealing member 320 can be installed in the through-hole 52. At this time, the flange portion 324 is positioned in the through-hole 52, and the flange portion 326 is positioned in the rod accommodating chamber 56. Then, as described above, if the stand 26 is coupled to the rod 54 by the rotation shaft 310, the outer surface 302A of the stand-side rotation shaft 302 and the inner surface 322A of the cylindrical portion 322 are in sliding contact. Thus, the through-hole 52 can be sealed.

[0154] <Method of removing the sealing member from the through-hole>

[0155] First, the rod 54 is detached from the rod accommodating chamber 56 side. Then, the knob portion 328 is removed, and the sealing member 320 is removed from the through-hole 52. Thus, the inner surface 52A of the through-hole 52 can be cleaned.

[0156] Therefore, in the front end portion 300 of the second embodiment, as in the front end portion 10 of the first embodiment, the through-hole 52 is sealed by the sealing member 320, so that the liquid such as body fluid can be prevented from being introduced into the rod accommodating chamber 56 from the through-hole 52. Also, since the sealing member 320 is detachable from the rod accommodating chamber 56 side, the inner surface 52A of the through-hole 52 can be cleaned with a cleaning liquid. Thus, the cleanability of the front end portion 300 can be improved.

[0157] <Method of removing the sealing member from the through-hole>

[0158] The sealing member 320 of the second embodiment is preferably detachable at least from the rod-side rotation shaft 304. Thus, the rod-side rotation shaft 304 and the sealing member 320 can be simultaneously inserted into the through-hole 52 in a state where the sealing member 320 is previously installed on the rod-side rotation shaft 304. Alternatively, the sealing member 320 can be detachably provided on the stand-side rotation shaft 302.

[0159] <Method of removing the sealing member from the through-hole>

[0160] The sealing member 320 can be fixed to the rod-side rotation shaft 304. Figure 23 is a sectional view showing that the sealing member 320 is fixed to the rod-side rotation shaft 304 with an adhesive 330. In this case, the rod-side rotation shaft 304 and the sealing member 320 can be simultaneously inserted into the through-hole 52. Also, the rod-side rotation shaft 304 and the sealing member 320 can be simultaneously removed from the through-hole 52.

[0161] <Method of removing the sealing member from the through-hole>

[0162] Also, the sealing member 320 and the rod-side rotation shaft 304 can be formed as one piece. Figure 24is a sectional view of the sealing member 320 and the shaft-side rotating shaft 304 being formed as one body by the one body 332. In this case, the same effects as the above-described fixing method can be obtained.

[0163] In addition, in the second embodiment, the corner hole portion 308 is provided as the fitted portion on the stand-side rotating shaft 302 and the prism portion 306 is provided as the fitting portion on the shaft-side rotating shaft 304, but it is not limited thereto. The prism portion 306 can be provided on the stand-side rotating shaft 302 and the corner hole portion 308 can be provided on the shaft-side rotating shaft 304.

[0164] In addition, in the second embodiment, the fitting method of the fitting portion and the fitted portion is described as the fitting method based on the prism portion 306 and the corner hole portion 308, but it is not limited thereto. As long as the fitting method can reliably transmit the rotating force of the shaft 54 to the stand 26, for example, the fitting method of the cylindrical portion and the round hole portion can be used.

[0165] In addition, in the second embodiment, the method of forming the stand 26 and the stand-side rotating shaft 302 as one body is described, but it is not limited thereto. For example, the stand 26 and the stand-side rotating shaft 302 can be formed as separate bodies, and these stand 26 and stand-side rotating shaft 302 can be connected by the connection structure described in the above. Figure 14 That is, the connection structure in which the through hole 72 is provided in the stand 26 and the edge portion 50B and the arc portion 50C are formed in the stand-side rotating shaft 302 can be used.

[0166] In the above-described embodiments, the side-viewing endoscope is described as an example, but the present application can be applied to various endoscopes such as the ultrasonic endoscope and the direct-viewing endoscope having the stand that changes the direction of the guide of the treatment instrument at the distal end of the insertion portion.

[0167] The endoscope according to the embodiments has been described above, but the present application can be modified or deformed in several ways within the scope of the present application without departing from the spirit of the present application.

Claims

1. An endoscope characterized by comprising: a distal end portion having a stand housing portion and a shaft housing portion; a stand housed in the stand housing portion; a shaft housed in the shaft housing portion; a cable connected to the shaft; a partition wall provided to the distal end portion and separating the stand housing portion and the shaft housing portion; a rotation shaft connecting the stand and the shaft; a first through-hole provided to the partition wall and through which the rotation shaft is inserted; and a sealing member attached to the rotation shaft and sealing the first through-hole when the rotation shaft is inserted in the first through-hole, and detachable from the shaft housing portion side.

2. The endoscope according to claim 1, characterized in that: the shaft has a second through-hole through which the rotation shaft is inserted, a flat edge portion and a curved edge portion are formed on the rotation shaft in parallel with the axial direction of the rotation shaft, the curved edge portion is in sliding contact with the inner surface of each of the first through-hole and the second through-hole, a gap portion is provided between the flat edge portion and the inner surface of each of the first through-hole and the second through-hole, and the sealing member is fitted in the gap portion.

3. The endoscope according to claim 2, characterized in that: the sealing member has: a base portion that is fitted so as not to rotate relative to the shaft; and a protruding portion that protrudes from the base portion, the protruding portion is fitted in the gap portion.

4. The endoscope according to claim 3, characterized in that: the base portion has a fitting hole that is fitted so as not to rotate relative to the rotation shaft.

5. The endoscope according to claim 1, characterized by comprising: a first rotation shaft provided to the stand and constituting the rotation shaft; and a second rotation shaft provided to the shaft and constituting the rotation shaft, a fitting portion is provided to one of the first rotation shaft and the second rotation shaft, and a fitted portion that is fitted to the fitting portion is provided to the other of the first rotation shaft and the second rotation shaft.

6. The endoscope according to claim 5, characterized in that: the sealing member is detachable to at least the second rotation shaft.

7. The endoscope according to claim 5, characterized in that: a knob portion is provided to protrude from an end portion on the shaft housing portion side of the sealing member.

8. The endoscope according to claim 5, characterized in that: the sealing member is fixed to the second rotation shaft.

9. The endoscope according to claim 5, characterized in that: the sealing member and the second rotation shaft are formed as one body.

10. The endoscope according to claim 5, characterized in that: the sealing member has a cylindrical shape through which the first rotation shaft and the second rotation shaft are inserted, the sealing member has: a first flange portion provided to the axial direction of the sealing member on the first rotation shaft side and protruding in a radial direction orthogonal to the axial direction; and a second flange portion provided to the axial direction of the sealing member on the second rotation shaft side and protruding in the radial direction.

11. The endoscope according to claim 10, characterized in that: ​ ​ A knob portion is provided protruding at an end portion of the rod accommodating portion side of the second flange portion.

12. The endoscope according to claim 10, wherein The first flange portion is disposed in the first through-hole, The second flange portion is disposed in the rod accommodating portion.

13. The endoscope according to any one of claims 1 to 12, wherein The standing base has a third through-hole into which the rotation shaft is inserted, An edge portion that is flat in parallel with the circumferential surface of the rotation shaft and an arc portion that is curved are formed on the rotation shaft, The third through-hole has a hole-side edge portion that is opposite to and in contact with the edge portion and a hole-side arc portion that is opposite to the arc portion with a gap portion therebetween.

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