JP6173624B1 - Endoscope - Google Patents

Abstract

The present invention, in an endoscope having a bi-directional bending mechanism and an insertion portion rotation mechanism, achieves downsizing and improves assembly while providing a rotation amount detection sensor unit of the insertion portion in the internal space of the operation portion. Therefore, the endoscope of the present invention includes an operation unit 12 and an insertion unit that is connected to the distal end side of the operation unit so as to be rotatable around a longitudinal axis. 11, a conversion unit 30 provided at the proximal end of the insertion unit for converting the rotation of the insertion unit into a displacement in the longitudinal axis direction, a transmission unit 42 for transmitting the displacement generated by the conversion unit in the longitudinal axis direction, and an operation And a detection sensor 41 for detecting the displacement transmitted by the transmission unit.

Description

The present invention relates to an endoscope insertion portion to the operation portion is configured to freely rotate around the insertion axis.

  2. Description of the Related Art Conventionally, an endoscope configured with an elongated tube-shaped insertion portion has been widely used in, for example, the medical field and the industrial field. Among these, medical endoscopes used in the medical field are used to observe an organ or the like by inserting an insertion portion into a body cavity of a subject, for example, a living body, or to an endoscope with respect to the organ or the like as necessary. Various treatments can be performed using the treatment tool inserted in the treatment tool insertion channel provided. In addition, an industrial endoscope used in the industrial field inserts an insertion portion into a subject, for example, a device or facility such as a jet engine or factory piping, and the state inside the subject, for example, scratches, corrosion, etc. It is configured so that state observation, inspection, and the like can be performed.

  In a conventional endoscope, a flexible insertion portion is generally configured by connecting a distal end portion, a bending portion, and a flexible tube portion in order from the distal end side. In this case, an operation portion formed by arranging a plurality of operation members that are held by the operator and perform various operations is disposed at the base end portion of the insertion portion.

  In an endoscope of a conventional form, for example, an endoscope used in a respiratory system is provided with a bending portion having a bending mechanism that enables a bending operation in two directions to reduce the diameter of the insertion portion. In recent years, various proposals have been made with an insertion portion rotation mechanism for making the insertion portion rotatable about the insertion axis with respect to the operation portion for the purpose of further improving the insertability. Has been put to practical use.

  On the other hand, when using this type of conventional endoscope, that is, a flexible endoscope having a bi-directional bending mechanism and an insertion portion rotation mechanism, a user (user) performs an operation of bending the bending portion, By repeating the operation of rotating the insertion portion, an operation of inserting the insertion portion into a target site deep in the lumen is performed. In this case, for example, the bending direction when the insertion portion is rotated is displaced by the angle of the rotation operation with respect to the bending direction when the insertion portion is in the neutral position. Therefore, when the user (user) rotates the insertion portion, it is necessary to confirm the rotation angle of the insertion portion by visually confirming the position of the rotation operation member in the rotation direction. .

  For this reason, the user (user) may be forced to interrupt the observation of the endoscopic image (monitor display screen) in order to view the rotating operation member at hand during the procedure. In addition, when the user (user) performs the bending operation without visually confirming the rotating operation member at hand, there may be a situation in which the bending operation cannot be performed in the intended direction.

  Therefore, in an endoscope provided with a conventional insertion portion rotation mechanism, a device including a rotation amount detection member (sensor) for detecting the rotation amount of the insertion portion by the rotation operation member is, for example, a Japanese patent. Various proposals are made in Japanese Unexamined Patent Publication No. 2015-100560.

  In the endoscope disclosed in the above Japanese Patent Publication No. 2015-100560, an operation unit is connected to a proximal end side of a long insertion unit, and a connection portion between the insertion unit and the operation unit includes: An annular insertion portion rotating operation member configured integrally with the insertion portion is provided. When the insertion portion rotation operation member is rotated around the insertion axis, the insertion portion base provided at the base end portion of the insertion portion is rotated together with the insertion portion rotation operation member. . The endoscope further includes a rotation amount detection sensor that detects the rotation amount of the insertion portion base. In this case, a cover member that covers a part of the rotation amount detection sensor is provided in order to avoid interference between the rotation amount detection sensor and the internal structure of the operation unit.

  However, in the endoscope disclosed by the above Japanese Patent Publication No. 2015-100560 and the like, a rotation amount detection sensor for detecting the rotation amount of the insertion portion (insertion portion base) and the internal structure of the operation portion. In order to avoid interference with an object, it is necessary to provide a cover member that covers a part of the rotation amount detection sensor, which hinders downsizing of the endoscope.

The present invention has been made in view of the above-described points, and an object of the present invention is to have a bi-directional bending mechanism that enables bi-directional bending operation of the insertion portion and to be inserted into the operation portion. In a flexible endoscope having an insertion portion rotation mechanism that allows the portion to rotate about the insertion axis, a rotation amount detection sensor unit for detecting the rotation amount of the insertion portion is disposed in the internal space of the operation portion. It is to provide an endoscope that can realize downsizing of an endoscope and contribute to improvement of assemblability while being installed.

In order to achieve the above object, an endoscope according to an aspect of the present invention includes an operation unit, an insertion unit connected to the distal end side of the operation unit so as to be rotatable about a longitudinal axis, and a base of the insertion unit. A conversion portion that is provided at an end portion and converts the rotation of the insertion portion into displacement in the direction of the longitudinal axis; and a distal end portion that comes into contact with the conversion portion, and extends from the distal end portion along the longitudinal axis A first extending portion extending to the proximal end side, and the first end is connected to the proximal end portion of the first extending portion, and is offset in a direction orthogonal to the direction of the longitudinal axis The displacement generated by the conversion unit is provided with an offset unit and a second extension unit that is provided continuously with the second end of the offset unit and extends to the base end side along the longitudinal axis. the first extending portion, transmitted to the direction of the longitudinal axis through the offset portion and the second extending portion transmitted If, disposed in the operating unit comprises a detection sensor for detecting a has been the displacement transmitted to the second extending portion.

According to the present invention, there is provided the insertion portion rotating mechanism that has the two-way bending mechanism that enables the insertion portion to bend in two directions and that allows the insertion portion to rotate about the insertion axis with respect to the operation portion. In a flexible endoscope, the rotation amount detection sensor unit for detecting the rotation amount of the insertion portion is disposed in the internal space of the operation portion, but the endoscope can be downsized and assembled. An endoscope that can contribute to improvement can be provided.

1 is a schematic perspective view showing an overall configuration of an endoscope system including an endoscope according to a first embodiment of the present invention. The figure which removes an exterior member in the operation part in the endoscope of FIG. 1, and shows the internal structure Sectional drawing which follows the [3]-[3] line of FIG. FIG. 2 is an internal configuration diagram illustrating the arrangement of the insertion portion base and the rotation amount detection sensor unit in the operation portion by further removing the rotation operation member and the bend preventing member from the state shown in FIG. FIG. 7 is an enlarged view showing only the insertion portion base and the rotation amount detection sensor unit in the endoscope of FIG. 1, and is a view showing a surface viewed from the direction of arrow [5] in FIG. 6. FIG. 6 is an enlarged view showing only the insertion base and the rotation amount detection sensor unit in the endoscope of FIG. 1, and is a view showing a surface viewed from the direction of arrow [6] in FIGS. 4 and 5. The principal part enlarged view which expands and shows a part of shaft member contained in the insertion part nozzle | cap | die in the endoscope of the 2nd Embodiment of this invention, and the rotation amount detection sensor unit. The figure which looked at the insertion part cap of FIG. 7 from another direction The figure which removes an exterior member in the operation part in the endoscope of the 3rd Embodiment of this invention, and shows the internal structure. Sectional drawing which follows the [10]-[10] line of FIG. 9 is an internal configuration diagram showing the arrangement of the insertion portion base and the rotation amount detection sensor unit in the operation portion by further removing the rotation operation member and the folding prevention member from the state shown in FIG. FIG. 9 is an enlarged view showing only the insertion portion base and the rotation amount detection sensor unit in the endoscope of FIG. A first configuration example of a rotation amount detection means for detecting a rotation amount of an insertion portion by a rotation operation member in an endoscope in which an insertion portion is configured to be rotatable around an insertion axis with respect to an operation portion. The figure which shows the endoscope of the form of A second example of the configuration of the rotation amount detecting means for detecting the rotation amount of the insertion portion by the rotation operation member in the endoscope in which the insertion portion is configured to be rotatable around the insertion axis with respect to the operation portion. The figure which shows the endoscope of the form of

  The present invention will be described below with reference to the illustrated embodiments. Each drawing used in the following description is schematically shown. In order to show each component in a size that can be recognized on the drawing, the dimensional relationship and scale of each member are different for each component. May be shown. Therefore, the present invention is limited to the illustrated embodiments with respect to the number of components, the shape of the components, the size ratio of the components, the relative positional relationship of the components, and the like described in the drawings. It is not something.

[First Embodiment]
FIG. 1 is a schematic perspective view showing an overall configuration of an endoscope system including an endoscope according to a first embodiment of the present invention. FIG. 2 is a diagram illustrating an internal configuration of the operation unit of the endoscope according to the present embodiment with the exterior member removed. 3 is a cross-sectional view taken along line [3]-[3] in FIG. FIG. 4 is an internal view showing the arrangement of the insertion portion base and the rotation amount detection sensor unit in the operation unit in the operation unit in the endoscope of the present embodiment by further removing the rotation operation member and the folding prevention member from the state shown in FIG. It is a block diagram. 5 and 6 are enlarged views showing only the insertion portion base and the rotation amount detection sensor unit in the endoscope of the present embodiment. Of these, FIG. 5 shows the same surface as FIG. 4 (a surface viewed from the direction of arrow [5] in FIG. 6). FIG. 6 shows a surface viewed from the direction of the arrow [6] in FIGS.

  First, the overall configuration of an endoscope system including the endoscope according to the first embodiment of the present invention will be briefly described below with reference to FIG.

  As shown in FIG. 1, the endoscope system 1 of the present embodiment is mainly configured by an endoscope 2, a light source device 3, a video processor 4, and a display device 5.

  The endoscope 2 includes an insertion portion 11, an operation portion 12 that is connected to the proximal end of the insertion portion 11, and a universal cable 13 that extends from the operation portion 12.

  The insertion portion 11 is elongated and flexible, and is connected to the distal end side of the operation portion 12 so as to be rotatable around the longitudinal axis. The insertion portion 11 is composed of a distal end portion 21, a bending portion 22, and an elongated and long tubular member having one end connected to the proximal end of the bending portion 22 and the other end connected to the distal end of the operation portion 12. It is mainly comprised by the flexible tube part 23. FIG.

  The distal end portion 21 is provided at the most distal end portion of the insertion portion 11 and is formed of a hard member, and a structure such as an imaging unit including an observation optical system and an imaging element is accommodated therein. In addition, a front end opening of a treatment instrument insertion channel (not shown) that is inserted and arranged in the insertion portion 11 is provided on the front surface of the distal end portion 21.

  The bending portion 22 is connected to the proximal end of the distal end portion 21 and is configured to include a bi-directional bending mechanism that bends in, for example, two directions up and down in response to a predetermined operation from the operation portion 12.

  The flexible tube portion 23 has one end (distal end side) connected to the proximal end portion of the bending portion 22 and the other end (proximal end side) continuous to the distal end portion of the operation portion 12. And is formed by a flexible tubular member.

  In addition, since each component of the insertion portion 11 is not a portion directly related to the gist of the present invention, these configurations are applied to a conventional general endoscope such as a bronchial endoscope or a urethral endoscope. The detailed description and illustration are omitted as having the same configuration as that described.

  The operation unit 12 includes a grasping unit 24, a bending operation lever 25, an insertion unit rotation operation dial 26 for rotating the insertion unit, and a treatment instrument insertion communicated with a treatment instrument insertion channel (not shown). It has a mouth 27, a bend preventing portion 28 and the like.

  The grip part 24 is a part that is held by a user (user) of the endoscope 2 and functions as an exterior member of the operation part 12 and includes a space that houses various structures therein. is there. On the outer surface of the grip portion 24, a plurality of operation members are provided. Examples of the plurality of operation members include a bending operation lever 25 and an insertion portion rotation operation dial 26. Among these, for example, the bending operation lever 25 is an operation member for acting on a bi-directional bending mechanism (not shown) to bend the bending portion 22 in, for example, two directions.

  The bending operation lever 25 will now be described in some detail. For example, the user (user) places, for example, the thumb on the bending operation lever 25 among the fingers of the hand gripping the grip portion 24, and places the thumb on the bending operation lever 25 in a predetermined direction, for example, from the neutral position shown in FIG. An operation of rotating in the upward direction indicated by the arrow sign [U] or in the downward direction indicated by the arrow sign [D] in FIG. 1 is performed. Then, by performing such an operation, the bending operation lever 25 acts on a bending mechanism (not shown) so that the bending portion 22 can be bent in either the upward or downward direction. It is configured.

  The insertion portion rotation operation dial 26 constitutes a part of an insertion portion rotation mechanism (not shown in FIG. 1, which will be described later) for rotating the insertion portion 11 around the insertion axis. It is an operation member which acts on a rotation mechanism. The insertion portion rotation operation dial 26 is provided in the vicinity of a continuous portion of the insertion portion 11 and the operation portion 12, and an insertion portion base (see FIG. 5) provided at the distal end portion of the operation portion 12 and the proximal end portion of the insertion portion 11. 1 is not shown, and is provided so as to cover reference numeral 30 in FIGS. The insertion portion rotating operation dial 26 is configured to be integrated with the insertion portion 11 via an insertion portion base 30 (described later). Therefore, the user (user) rotates the insertion portion 11 around the insertion axis with respect to the operation portion 12 by performing an operation of rotating the insertion portion rotation operation dial 26 around the insertion axis. It is comprised so that it can be made to.

  The treatment instrument insertion port 27 is provided so as to protrude to the side surface at a portion near the distal end of the grasping portion 24, and communicates with a treatment instrument insertion channel (not shown) inside the grasping portion 24, that is, inside the operation portion 12. It is an opening. The treatment instrument insertion channel is a tubular member that extends from the operation unit 12 into the insertion unit 11 and is inserted and arranged in the axial direction. Therefore, if an elongated treatment tool (not shown) or the like is inserted from the treatment tool insertion port 27, the distal end of the treatment tool (not shown) is inserted into the treatment tool insertion channel and the distal end of the insertion portion 11 is inserted. It is comprised so that it can protrude ahead from the front end side opening of the front-end | tip part 21. FIG.

  The anti-bending portion 28 is provided at a continuous portion of the insertion portion 11 and the operation portion 12 and covers the outer surface of the insertion portion 11 at the portion, thereby preventing the insertion portion 11 from being bent. doing. For this purpose, the bend preventing portion 28 is formed of a tubular member that is harder than the flexibility of the insertion portion 11. Note that the cross section of the anti-bending portion 28 is formed in a tapered shape toward the tip.

  The universal cable 13 is a flexible tubular member that extends from the operation unit 12 as described above. Various signal cables, light guide cables and the like (not shown) inserted through the insertion portion 11 and the operation portion 12 are inserted into the universal cable 13.

  A light source connector 14 is provided at the distal end of the universal cable 13. The light source connector 14 is detachably connected to the illumination light supply port of the light source device 3. Therefore, the illumination light emitted from the illumination light supply port of the light source device 3 is supplied to the incident end portion of the light guide cable via the light source connector 14 and then the distal end portion of the insertion portion 11 via the light guide cable. The light is emitted from the front illumination window 21.

  A signal cable 15 extends from the light source connector 14, and a signal connector 16 is provided at the tip of the signal cable 15. The signal connector 16 is detachably connected to the connection port of the video processor 4. Thereby, for example, a signal line extending from the imaging unit at the distal end portion 21 of the insertion portion 11, a signal line extending from a circuit board in the operation portion 12, and the like are electrically connected to the video processor 4. Yes.

  The light source device 3 is a component unit that includes a light source for supplying illumination light to the endoscope 2.

  The video processor 4 includes drive control of the imaging unit and the like in the endoscope 2, functions as a control processing unit including a control circuit that comprehensively controls each component of the endoscope system 1, and performs the above imaging It is a signal processing and control processing unit that functions as a signal processing unit that receives a video signal acquired by the unit and performs predetermined video signal processing and the like. Furthermore, the video processor 4 calculates the rotation angle of the insertion portion 11 based on a detection result (a displacement amount of the shaft member 42 (transmission portion), etc.) by a later-described rotation amount detection sensor unit 40 and outputs it as a signal. It also functions as an arithmetic unit.

  The display device 5 is a structural unit for receiving a video signal acquired by the imaging unit and processed by the video processor 4 and displaying a video of an affected area in a body cavity, that is, an endoscopic image. On the display screen of the display device 5, as shown in FIG. 1, for example, various information is displayed in an image display area 5 a for displaying the endoscopic image and an area other than the image display area 5 a. There is an information display area 5b and the like. Here, the information displayed in the information display area 5b is, for example, various types of information related to the endoscopic image being displayed. Specifically, for example, patient information or the endoscopic image being displayed is displayed. In addition to information such as various setting values, position information and direction information of the distal end portion of the endoscope 2 in use, the insertion portion 11 is rotated using the insertion portion rotation operation dial 26. Rotation angle information, rotation direction information, and the like according to the rotation amount of the insertion portion 11 at the time.

  As described above, the endoscope system 1 of the present embodiment is configured. In addition, since it is a part which is not directly related to the summary of this embodiment about the other structure in an endoscope system, the description is abbreviate | omitted and shall be comprised according to the structure of the conventional endoscope. .

  Next, the configuration of the insertion portion rotation mechanism and the rotation amount detection sensor unit in the endoscope of the present embodiment will be described in detail below with reference to FIGS.

  A plate-like main frame 31 is fixed to an inner fixing portion (not shown) of the grip portion 24 in the internal space of the grip portion 24 of the operation portion 12 of the endoscope 2 of the present embodiment. Various structures are fixedly disposed at predetermined positions on the main frame 31. Here, in the main frame 31, an insertion portion rotation mechanism and a rotation amount detection sensor unit 40 are disposed in the vicinity of the connection portion between the insertion portion 11 and the operation portion 12.

  As shown mainly in FIG. 3, the insertion portion rotating mechanism includes an insertion portion base 30, an insertion portion housing 32, an operation portion base 33, a first annular member 34, a second annular member 35, and the like. Configured.

  The insertion portion base 30 is a component member that is provided at the proximal end portion of the insertion portion 11 and functions as a conversion portion that converts the rotation of the insertion portion 11 into a displacement in a direction along the longitudinal axis.

  That is, the insertion portion base 30 is formed in a substantially cylindrical shape and has openings at both ends in the major axis direction. The insertion portion base 30 has a central axis of the insertion portion base 30, that is, a rotation axis Ax (see FIGS. 5 and 6 described later) of the insertion portion 11 and a long axis direction of the operation portion 12. Are arranged so as to substantially coincide with each other. Then, one end (tip end side) of the insertion portion base 30 is connected to the proximal end portion of the insertion portion 11 (the flexible tube portion 23 thereof). With this configuration, the flexible tube portion 23 extends from one end (tip end side) of the insertion portion base 30.

  An insertion portion housing 32 is disposed on the outer peripheral side of the insertion portion base 30. An insertion portion rotation operation dial 26 is disposed on the outer peripheral side of the insertion portion housing 32. A bend preventing portion 28 is disposed on the distal end side of the insertion portion rotating operation dial 26.

  Further, the outer peripheral edge of the opening at the other end (base end side) of the insertion portion base 30 is formed to have an annular inclined surface 30a inclined with respect to the long axis (see FIGS. 3 and 4). . Although details will be described later, in the insertion portion base 30, by providing the inclined surface 30 a, the conversion portion that converts the rotation of the insertion portion 11 into a displacement along the longitudinal axis (long axis direction). Function as. Here, for example, the insertion portion base 30 (the conversion portion) converts the rotation amount of the insertion portion 11 into a proportional rotation amount proportional to the rotation amount.

  On the other hand, an operation portion base 33 having a substantially cylindrical shape and having openings at both ends in the major axis direction is disposed in a portion near the tip in the operation portion 12. The other end (base end side) of the insertion portion base 30 is inserted and fitted inside the distal end portion of the operation portion base 33. A grip portion 24 is provided on the outer periphery on the proximal end side of the operation portion base 33. In this case, the insertion portion base 30 is rotatable about the long axis with respect to the operation portion base 33 (about the rotation axis Ax of the insertion portion base 30; see FIGS. 5 and 6), and It is arranged so as not to move in the long axis direction (direction along the rotation axis Ax).

  Further, on the outer peripheral side of the middle portion of the operation portion base 33 in the central axis direction (the same direction as the rotation axis Ax), the first annular member 34 is formed between the grip portion 24 and the insertion portion rotation operation dial 26. It is arranged so as to be sandwiched between them. A base end portion of the second annular member 35 is fixed to the outer peripheral side of the first annular member 34. Thereby, the indicator ring 29 is extrapolated and fixed to the first annular member 34 via the second annular member 35. The index ring 29 is a member provided with an index for confirming the rotation position of the insertion portion rotation operation dial 26.

  In the endoscope 2, various signal cables, bending wires, light guides, forceps channels and the like (not shown) are inserted and disposed in the connection portion between the operation unit 12 and the insertion unit 11. Yes. In this connection portion, between the insertion portion base 30 and the insertion portion housing 32, between the insertion portion housing 32 and the insertion portion rotation operation dial 26, and between the insertion portion rotation operation dial 26 and the second annular member 35. A plurality of O-rings and the like are disposed between the second annular member 35 and the first annular member 34 and between the first annular member 34 and the operation portion base 33. Thereby, the said operation part 12 is comprised so that it may become watertight with respect to the exterior.

  With this configuration, when the user (user) rotates the insertion portion rotation operation dial 26 relative to the index ring 29, the insertion portion rotation operation dial 26 and the insertion portion base 30, the insertion portion The housing 32, the bend preventing portion 28, and the flexible tube portion 23 rotate together around the long axis of the insertion portion 11. However, when the insertion portion rotation operation dial 26 is rotated with respect to the operation portion 12, the operation portion base 33, the first annular member 34, the second annular member 35, and the index ring 29 are not rotated (operation It is fixed to the fixed part of the part 12).

  On the other hand, the rotation amount detection sensor unit 40 is mainly composed of a rotation amount detection sensor 41, a shaft member 42, an urging spring 43, etc., as shown mainly in FIGS. 5 and 6 (see also FIGS. 2 to 4). It is configured. Among these, the rotation amount detection sensor 41 is mounted on the main frame 31. This rotation amount detection sensor 41 has a knob portion 41a which is a detected portion, and this knob portion 41a slides in the major axis direction of the rotation amount detection sensor 41 (direction of arrow X1 in FIGS. 5 and 6). It is comprised so that it can move. In this case, the knob portion 41a is an urging member having contractility, and receives the urging force of the urging spring 43 formed by a coil spring or the like, for example, in the direction of the arrow X1 shown in FIGS. That is, the insertion portion 11 is always biased toward the distal end side (the distal end portion of the shaft member 42 (transmission portion; described later) is directed toward the inclined surface 30a of the insertion portion base 30 (conversion portion)). The rotation amount detection sensor 41 is a sensor that detects the displacement of the knob portion 41a in the long axis direction and the moving direction in the long axis direction. That is, the rotation amount detection sensor 41 is a detection sensor that is disposed in the operation unit 12 and detects the displacement transmitted by the shaft member 42 (transmission unit).

  One end 42a of the shaft member 42 is locked to the knob portion 41a. The shaft member 42 is a rod-shaped member arranged so as to extend in a direction parallel to the rotation axis Ax of the insertion portion base 30. The other end 42 c of the shaft member 42 is disposed so as to contact the end surface of the inclined surface 30 a of the insertion portion base 30. With such a configuration, when the insertion portion base 30 rotates around the rotation axis Ax, that is, in the direction of the arrow R in FIGS. 5 and 6, the inclined surface 30a rotates in the same direction. The other end 42c moves relatively on the end surface of the inclined surface 30a of the insertion portion base 30 while always contacting the end surface of the inclined surface 30a of the insertion portion base 30.

  The insertion portion base 30 is disposed so as to rotate about the rotation axis Ax (in the direction of arrow R) but not move in the direction along the rotation axis Ax (in the direction of arrow X). Therefore, this causes the shaft member 42 to move in the direction along the rotation axis Ax, that is, in the direction of the arrow X in FIGS. That is, the insertion portion base 30 is a conversion portion that is provided at the proximal end portion of the insertion portion 11 and converts the rotation of the insertion portion 11 into displacement in a direction along the longitudinal axis. The shaft member 42 is a constituent member that functions as a transmission portion that transmits the displacement (in the direction along the longitudinal axis) generated by the insertion portion base 30 (conversion portion) in the longitudinal axis direction. Here, for example, the shaft member 42 (transmission portion) is a component that transmits the proportional rotation amount generated by the insertion portion base 30 (conversion portion).

  In the example shown in the present embodiment, the shaft member 42 has an offset portion 42b that is offset in a direction perpendicular to the major axis direction in the middle of the major axis direction (the same direction as the rotation axis Ax). It is formed as follows. By forming the offset portion 42b in this manner, the position of the one end 42a of the shaft member 42 with respect to the rotational axis Ax is set to be different from the position of the other end 42c with respect to the rotational axis Ax. Can do. That is, this is a device for arranging the knob portion 41a of the rotation amount detection sensor 41 locked to the one end 42a of the shaft member 42 at an arbitrary position in a plane orthogonal to the long axis.

  As described above, the shaft member 42 extends in parallel with the rotation axis Ax of the insertion portion base 30 with the other end 42c always in contact with the end surface of the inclined surface 30a of the insertion portion base 30. It is desirable to be arranged in However, since internal structures such as a treatment instrument insertion channel are densely arranged near the rotation axis Ax of the insertion portion base 30, interference between these internal structures and the shaft member 42 is prevented. It is necessary to avoid it. Thus, in the shaft member 42 of the present embodiment, as described above, by providing the offset portion 42b, interference between the shaft member 42 and the internal structure is avoided, and the shaft member 42 is smoothly and predetermined. It is configured to move in the direction (arrow X direction).

  In addition to the form in which the shaft member 42 is provided with the offset portion, various other forms for obtaining the same object effect are conceivable. For example, the shaft member 42 may be arranged obliquely so as to have an inclination angle with respect to the rotation axis Ax.

  In addition, it is desirable that the rotation amount detection sensor 41 in the operation unit 12 be disposed at a position away from, for example, the treatment instrument insertion port 27, the insertion unit base 30, and the like. That is, when the rotation amount detection sensor 41 is disposed in the vicinity of the treatment instrument insertion port 27, the insertion portion base 30, etc., dirt can be attached by inserting / removing the treatment instrument inserted into the body cavity into the body cavity. There is sex. Therefore, in this embodiment, the rotation amount detection sensor 41 in the operation unit 12 is disposed at a position away from the insertion portion base 30 or the like in the long axis direction. In this case, the arrangement of the rotation amount detection sensor 41 can be arbitrarily set only by changing the length of the shaft member 42 that transmits the rotation of the insertion portion base 30 in the long axis direction.

  The operation of the endoscope 2 of the present embodiment configured as described above will be described below. First, the user (user) holds the grip part 24 of the operation part 12 with one hand. At this time, an arbitrary fingertip, for example, a thumb is put on the bending operation lever 25. In this state, when the bending operation lever 25 is operated in the direction of the arrow sign [U] or the arrow sign [D], the bending part 22 of the insertion part 11 is bent in either of two directions.

  In this state, the user (user) rotates the insertion portion rotation operation dial 26 using the other hand. Then, the insertion unit 11 rotates in the rotation operation direction of the insertion unit rotation operation dial 26.

  At this time, the insertion portion base 30 is also rotated in the same direction as the insertion portion rotation operation dial 26 is rotated. As described above, when the insertion portion base 30 is rotated in the same direction, that is, around the rotation axis Ax, the knob portion 41 a of the rotation amount detection sensor 41 is moved in the arrow X direction via the shaft member 42.

  That is, as the insertion portion base 30 rotates, the shaft member 42 whose tip always contacts the inclined surface 30a moves in the arrow X direction. That is, the inclined surface 30a of the insertion portion base 30 serves to convert the rotation operation around the rotation axis Ax of the insertion portion base 30 into a reciprocation operation in the major axis direction (X direction) of the shaft member 42. Yes.

  In this case, the knob portion 41a moves by a predetermined amount in the major axis direction according to the rotation amount of the insertion portion 11. Further, the moving direction of the knob portion 41 a in the long axis direction corresponds to the rotating direction of the insertion portion rotating operation dial 26. The rotation amount detection sensor 41 detects a signal corresponding to the movement amount and movement direction of the knob portion 41a. The output of the rotation amount detection sensor 41 is transmitted to a control circuit in the video processor 4 via a predetermined signal cable. The control circuit of the video processor 4 receives the output of the rotation amount detection sensor 41 and performs a predetermined calculation process or the like, and performs a rotation amount corresponding to the rotation operation of the insertion portion rotation operation dial 26. (Movement angle) and rotation direction values are calculated. Then, a control process is performed to display the calculation result in a predetermined area on the display screen of the display device 5, that is, in a predetermined area near the area other than the main endoscope image display area. As the display form at this time, various forms such as a form that simply displays characters and numerical values, a form that is visually easy to understand, such as an animation display, and the like are conceivable.

  Thus, when the user (user) performs the rotation operation of the insertion portion rotation operation dial 26, the rotation amount and rotation corresponding to the rotation operation are displayed on the display screen of the display device 5 simultaneously with the operation. Information about the direction of movement is displayed. Since the information display continuously changes in conjunction with the rotation operation, the user (user) always operates the insertion portion rotation operation without taking his eyes off the display screen on which the endoscope image is displayed. The state of the turning operation of the dial 26 can be grasped.

  As described above, according to the first embodiment, the bi-directional bending mechanism that enables the bi-directional bending operation of the insertion portion 11 is provided, and the insertion portion 11 is moved around the insertion axis with respect to the operation portion 12. In the flexible endoscope 2 having an insertion portion rotation mechanism that is rotatable, a rotation amount detection sensor unit 40 for detecting the rotation amount and rotation direction of the insertion portion 11 is provided, and the rotation amount detection sensor unit is provided. Based on the output from 40, information on the rotation amount and the rotation direction of the insertion portion 11 is displayed on the display screen of the display device 5.

  In this case, the rotation operation of the insertion portion base 30 connected to the insertion portion 11 is performed by moving the shaft member 42 included in the rotation amount detection sensor unit 40 in the long axis direction by the inclined surface 30a of the insertion portion base 30 ( It is converted into an operation reciprocating in the X direction). The rotation amount detection sensor 41 receives the movement of the shaft member 42 in the long axis direction (X direction) and detects the movement amount and movement direction of the insertion portion base 30 (that is, the insertion portion 11). The amount and direction of rotation are detected. Information regarding the amount and direction of rotation of the insertion portion base 30 (insertion portion 11) detected in this way is displayed in the vicinity of the display area of the endoscopic image on the display screen of the display device 5. Therefore, this allows the user (user) to always keep an eye on the endoscope image displayed on the display screen of the display device 5 while the endoscope 2 is in use, and to always insert the insertion portion rotation operation dial 26. The state of the rotation operation can be grasped.

  In a normal case, in order to detect the rotation angle of the insertion portion rotation operation dial 26, it is desirable to arrange the rotation detection sensor so as to coincide with the rotation axis Ax of the insertion portion 11. However, generally, a treatment instrument channel or the like is inserted and arranged on the rotation axis Ax of the insertion portion 11. Therefore, when it is going to arrange | position a rotation detection sensor on the rotation axis Ax of the insertion part 11 with this structure, there exists a concern that the operation part 12 will enlarge, or an assembly property will deteriorate.

  Therefore, a configuration as in the above-described embodiment, that is, a configuration in which the rotation operation of the insertion portion base 30 (insertion portion 11) is converted into an operation in the major axis direction of the insertion portion base 30 (insertion portion 11) is adopted. Thus, the rotation amount and the rotation direction of the insertion portion base 30 (insertion portion 11) can be detected easily and surely without using a rotation detection sensor, and the operation portion 12 is enlarged. And the deterioration of assemblability can be suppressed.

[Second Embodiment]
Next, an endoscope according to a second embodiment of the present invention and an endoscope system including the endoscope will be described below. FIG. 7 and FIG. 8 are enlarged views of the main part of the insertion portion base and the shaft member included in the rotation amount detection sensor unit in the endoscope according to the second embodiment of the present invention.

  The basic configuration of the present embodiment is substantially the same as that of the first embodiment described above, and the shape of the insertion portion base 30A and the shaft member 42A included in the rotation amount detection sensor unit connected to the insertion portion base 30A. Only the form is different. Accordingly, only the configuration different from the above-described first embodiment will be described in detail below, and the drawings and description of other components will be omitted. In addition, portions appearing in the drawings are denoted by the same reference numerals as those in the first embodiment, and description thereof is omitted.

  The insertion portion base 30A employed in the endoscope of the present embodiment is formed in a substantially cylindrical shape and has openings at both ends in the major axis direction, as in the first embodiment. It is the same in the point. However, in the insertion portion base 30A of the present embodiment, as shown in FIGS. 7 and 8, the inclined surface 30a of the insertion portion base 30 in the first embodiment described above is abolished, and the opening peripheral edges at both ends thereof The portion is formed in parallel to a plane substantially orthogonal to the rotation axis Ax of the insertion portion base 30A.

  A cam groove 30Aa having a predetermined inclination angle with respect to the rotation axis Ax is formed on the peripheral surface on the base end side of the insertion portion base 30A. This cam groove 30Aa is a component corresponding to the inclined surface 30a of the insertion portion base 30 in the first embodiment described above.

  A cam pin 42Aa of the shaft member 42A is cam-coupled to the cam groove 30Aa. That is, the shaft member 42A included in the endoscope rotation amount detection sensor unit of the present embodiment is configured to have a cam pin 42Aa that is a cam follower in the vicinity of the distal end portion. The cam pin 42Aa is a pin-shaped portion that protrudes in a direction orthogonal to the axial direction of the shaft member 42A.

  In the present embodiment, since the movement of the shaft member 42A in the major axis direction is realized by the cam groove 30Aa, the biasing spring in the rotation amount detection sensor unit of the first embodiment described above is unnecessary. is there. Other configurations are the same as those in the first embodiment.

  Also in the endoscope of this embodiment having such a configuration, when the insertion portion rotation operation dial 26 is rotated, the insertion portion base 30A is rotated in the direction of the arrow R in FIGS. Then, the insertion portion 11 is rotated in the same direction. The rotating operation of the insertion portion base 30A at this time is transmitted to the shaft member 42A via the cam pin 42Aa, and moves the shaft member 42A in the direction of the arrow X in FIGS.

  Therefore, even in the configuration according to the present embodiment, the same operation as that of the above-described first embodiment can be realized, and the same effect can be obtained. Furthermore, since the urging spring required in the first embodiment described above can be omitted, it is possible to contribute to further simplification of the configuration of the rotation amount detection sensor unit.

[Third Embodiment]
Next, an endoscope according to a third embodiment of the present invention and an endoscope system including the endoscope will be described below. 9-12 is a figure which shows the 3rd Embodiment of this invention. Among these, FIG. 9 is a diagram illustrating an internal configuration of the operation unit of the endoscope according to the present embodiment with the exterior member removed. 10 is a cross-sectional view taken along the line [10]-[10] in FIG. FIG. 11 is an internal view showing the arrangement of the insertion portion cap and the rotation amount detection sensor unit in the operation unit by further removing the rotation operation member and the folding prevention member from the state shown in FIG. 9 in the operation unit in the endoscope of the present embodiment. It is a block diagram. FIG. 12 is an enlarged view showing only the insertion base and the rotation amount detection sensor unit in the endoscope of the present embodiment.

  The basic configuration of the present embodiment is substantially the same as that of the first embodiment described above, and only the configurations of the insertion portion rotation mechanism and the rotation amount detection sensor unit are different. Therefore, only the configuration different from the above-described first embodiment will be described in detail below, and the drawings and description of other components will be omitted. In addition, portions appearing in the drawings are denoted by the same reference numerals as those in the first embodiment, and description thereof is omitted.

  The basic configuration of the insertion portion rotation mechanism employed in the endoscope of the present embodiment is substantially the same as the conventional embodiment. In the present embodiment, an insertion portion rotation transmission member 37 is continuously provided on the proximal end side of the insertion portion base 30B of the conventional form. The insertion portion rotation transmission member 37 is a member formed in a substantially cylindrical shape, and the distal end side is integrally connected to the proximal end side of the insertion portion base 30B. Therefore, when the insertion portion base 30B rotates about the rotation axis Ax in accordance with the rotation operation of the insertion portion rotation operation dial 26, the insertion portion rotation transmission member 37 also rotates in the same direction. It is configured. And the gear part 36 which is the 1st gear of the spur gear form is formed in the base end side outer peripheral surface of the said insertion part rotation transmission member 37. As shown in FIG. The gear portion 36 is engaged with a pinion gear 44 (detailed later) included in a rotation amount detection sensor unit 40B described later.

  The rotation amount detection sensor unit 40B in the endoscope of the present embodiment is mainly configured by a rotation amount detection sensor 41B, a shaft member 42B, a pinion gear 44, a shaft shake suppression cover member 45, and the like.

  The pinion gear 44 is a small-diameter spur gear that meshes with the gear portion 36 of the insertion portion rotation transmission member 37 and is a second gear. This pinion gear 44 is fixed coaxially on the tip side of the shaft member 42B.

  Here, in the present embodiment, the shaft member 42 </ b> B as the transmission portion is provided eccentrically from the gear portion 36 (first gear) of the insertion portion rotation transmission member 37. The shaft member 42B is disposed coaxially with the pinion gear 44 (second gear) that meshes with the gear portion 36 (first gear) to generate a proportional rotation amount, and the operation portion. 12B, and a shaft portion that is a rod-shaped rotating member that rotates in conjunction with the rotation of the pinion gear 44.

  On the other hand, a rotation amount detection sensor 41B is fixed on the base end side of the shaft member 42B. The shaft member 42B is rotatably disposed on the main frame 31 inside the operation portion 12B. The rotation amount detection sensor 41B is a sensor that detects the rotation amount and the rotation direction of the shaft member 42B. More specifically, the rotation amount detection sensor 41B is a rotation detection sensor that detects the rotation angle of the base end portion of the shaft portion (rotation member) of the shaft member 42B.

  Accordingly, with this configuration, the shaft member 42B transmits the rotation of the insertion portion rotation operation dial 26 and the insertion portion base 30B to the rotation amount detection sensor 41B via the gear portion 36 and the pinion gear 44. It has a role to do.

  Also in the present embodiment, it is desirable that the rotation amount detection sensor 41B is disposed at a position away from components such as the insertion portion base 30B. Therefore, the shaft member 42B has a certain length in the long axis direction. In this case, when the shaft member 42B rotates, the shaft runout tends to occur as the length increases. Therefore, in the present embodiment, a shaft runout restraining cover member 45 that is a shaft runout restraining member for restraining shaft runout that occurs when the shaft member 42B rotates is configured. The shaft runout prevention cover member 45 is disposed so as to cover the shaft member 42B. Other configurations are the same as those in the first embodiment and the conventional endoscope and endoscope system.

  Also in the endoscope of this embodiment having such a configuration, when the insertion portion rotation operation dial 26 is rotated, the insertion portion 11 is rotated in the same direction, and at the same time, the insertion portion rotation operation dial 26 is moved. With the rotation, the insertion portion base 30B rotates around the rotation axis Ax, that is, in the direction of the arrow R1 in FIG. Then, the insertion portion rotation transmission member 37 rotates in the same direction together with the insertion portion base 30B. Therefore, the gear part 36 also rotates in the same direction.

  In response to this, the pinion gear 44 meshed with the gear portion 36 rotates in the direction opposite to the rotation direction of the gear portion 36 around the axis of the shaft member 42B, that is, in the direction of the arrow R2 in FIG. . Accordingly, the shaft member 42B also rotates in the same direction as the pinion gear 44.

  The rotation amount and the rotation direction of the shaft member 42B are detected by a rotation amount detection sensor 41B. The detection result is transmitted to the control circuit of the video processor 4, and based on this, the control circuit calculates information about the rotation amount and the rotation direction of the insertion unit 11 (insertion unit rotation operation dial 26). These pieces of information are displayed in a predetermined form on the display screen of the display device 5 in the same manner as described in the first embodiment.

  As described above, according to the third embodiment, the rotation axis Ax of the insertion portion 11 (insertion portion base 30B) and the rotation central axis of the shaft member 42B are engaged with each other by the gears (36, 44). It is set as the structure arrange | positioned so that it may become a position which changes with (it does not correspond). The rotation of the insertion portion base 30B is transmitted to the shaft member 42B by the gears (36, 44), and the rotation amount of the shaft member 42B and the rotation amount detection sensor 41B provided at the base end of the shaft member 42B are transmitted. The rotation direction is detected.

  Accordingly, since the shaft member 42B and the rotation amount detection sensor 41B are arranged at positions shifted in the radial direction from the rotation axis Ax of the insertion portion base 30B, interference between the shaft member 42 and the internal structure is avoided. At the same time, the rotation amount detection sensor can be efficiently arranged by effectively utilizing a small internal space. Thereby, the enlargement of an operation part and the deterioration of assemblability can be suppressed.

  In addition, by providing the shaft member 42B with the shaft runout restraining cover member 45, the shaft runout of the shaft member 42B can be restrained. Accordingly, this can contribute to improvement in detection accuracy of the rotation amount detection sensor 41B that detects the rotation amount and the rotation direction of the shaft member 42B.

  By the way, in the endoscope in which the insertion portion is configured to be rotatable around the insertion axis with respect to the operation portion, as a configuration example of the rotation amount detection means for detecting the rotation amount of the insertion portion by the rotation operation member, Are of the form shown in FIGS.

  The endoscope of the first embodiment illustrated in FIG. 13 includes an index member 47 fixed on the insertion portion base 30 side and a rotation amount detection member (sensor) 46 fixed on the operation portion base 33 side. A protective member 48 for protecting the surrounding space of the rotation amount detecting means is provided.

  Here, the indicator member 47 is formed in a substantially annular shape, and is fixed to the proximal end portion of the insertion portion base 30. A predetermined scale (scale) is provided on the surface of the index member 47 (not shown). This scale (scale) constitutes a position indicating section provided at a position corresponding to the rotation angle of the flexible tube section 23 of the endoscope.

  The rotation amount detection unit 46 is fixed to the inner peripheral surface of the operation unit base 33. From this rotation amount detection part 46, the cable 46a is extended toward the inside of the operation part (12). The rotation amount detection unit 46 includes a light emitting unit and a light receiving unit (not shown). In the rotation amount detection unit 46, the light emitting unit is a member that emits spot light, and light emitted from the light emitting unit is emitted toward the index member 47. The light receiving unit is configured to receive the reflected light of the spot light emitted from the light emitting unit and reflected by the indicator member 47.

  With such a configuration, when the insertion portion rotation dial 26 is rotated, the indicator member 47 is rotated in the same direction according to the rotation of the insertion portion rotation dial 26. On the other hand, the rotation amount detection unit 46 does not rotate with respect to the insertion unit rotation dial 26. At this time, the rotation amount detection unit 46 detects the rotation angle of the flexible tube unit 23 by reading the scale (scale) of the rotating index member 47 and detecting the movement amount of the index member 47. It is configured to be able to. The other configurations of the endoscope are substantially the same as those of the above-described embodiments.

  In the endoscope illustrated in FIG. 13 provided with the rotation amount detection means of the first embodiment having such a configuration, a space in the vicinity of an arrangement site of the rotation amount detection means (the index member 47, the rotation amount detection unit 46). A protective member 48 is provided so as to cover.

  The protection member 48 isolates the space around the rotation amount detection means (47, 48) from the other internal structure of the endoscope, so that dust, anti-friction agent, etc. in the space are isolated. Intrusion is suppressed, and adhesion of dust, an anti-friction agent, etc. to the rotation amount detection means (47, 48), particularly the sensor surface (reading surface) of the rotation amount detection unit 46 is suppressed. It is a structural member provided to contribute to improving the detection accuracy of the rotation amount by suppressing the rotation. The anti-friction agent refers to a coating agent or the like previously applied to each built-in object in order to ensure slipping between the built-in endoscope objects.

  For this purpose, the protection member 48 includes an annular portion 48 a that is tightly fixed to the inner peripheral surface of the operation portion base 33, and a part of the base portion of the insertion portion base 30 that is integrally formed from the annular portion. And a protruding portion 48b slidably contacting the inner peripheral surface in the vicinity of the portion. The protruding portion 48b is formed with a protruding portion that protrudes toward the inner peripheral surface of the insertion portion base 30 and is in sliding contact with the inner peripheral surface.

  The protective member 48 is made of a material such as a silicon rubber having a sealing property. Further, the protruding portion of the protection member 48 is in sliding contact with the inner peripheral surface of the insertion portion base 30 that rotates according to the rotation of the insertion portion rotation dial 26. Therefore, the amount of rotational power is determined by the degree of contact between the protrusion of the protection member 48 and the inner peripheral surface of the insertion portion base 30.

  Further, in the endoscope of the second form illustrated in FIG. 14, instead of the protection member 48, a part of the insertion portion base 30A is used to protect the surrounding space of the rotation amount detection means.

  That is, the endoscope of the second form illustrated in FIG. 14 is configured to have a circumferential groove 30Aa on the outer peripheral surface of the insertion portion base 30A. The circumferential groove 30Aa is a space in which the rotation amount detection means, that is, the index member 47 and the rotation amount detection member (sensor) 46 is arranged when the insertion portion base 30A is inserted and arranged with respect to the operation portion base 33. Form. That is, the circumferential groove 30Aa is a part formed to isolate the space around the rotation amount detection means (47, 48) from other internal structures of the endoscope.

  In this case, in the state in which the insertion portion base 30A is inserted and arranged with respect to the operation portion base 33, an O (O) ring 49 is interposed therebetween. This O (O) ring 49 has the same function as that of the protective member 48 in the first embodiment described above, that is, dust and reduction to the surrounding space of the rotation amount detecting means (47, 48) formed by the circumferential groove 30Aa. It has the function of preventing intrusion of abrasives and the like and suppressing the detection failure of the rotation amount detecting means, thereby contributing to the improvement of the detection accuracy of the rotation amount. Also in this embodiment, the index member 47 of the rotation amount detection means is fixed to the insertion portion base 30 side, and the rotation amount detection member (sensor) 46 is fixed to the operation portion base 33 side.

  As described above, if the surrounding space of the rotation amount detection member (46, 47) is protected, it is possible to suppress the entry of dust or the like into the space, and thus the rotation amount detection member (46, 47). 47) can be suppressed and the detection accuracy of the rotation amount can be improved.

  In both the first and second embodiments, in the rotation amount detection means, the index member 47 is fixed on the insertion portion base 30 side, and the rotation amount detection member (sensor) 46 is fixed on the operation portion base 33 side. Although an example is shown, it is not limited to this example. For example, the index member 47 may be fixed to the operation portion base 33 side, and the rotation amount detection member (sensor) 46 may be fixed to the insertion portion base 30 side. In addition, similar actions and effects can be obtained.

  The present invention is not limited to the above-described embodiments, and it is needless to say that various modifications and applications can be implemented without departing from the spirit of the invention. Further, the above embodiments include inventions at various stages, and various inventions can be extracted by appropriately combining a plurality of disclosed constituent elements. For example, even if several constituent requirements are deleted from all the constituent requirements shown in the above-described embodiment, if the problem to be solved by the invention can be solved and the effect of the invention can be obtained, this constituent requirement is deleted. The configured structure can be extracted as an invention. Furthermore, constituent elements over different embodiments may be appropriately combined. The invention is not limited by the specific embodiments thereof, except as limited by the appended claims.

  This application is filed on the basis of priority claim of Patent Application No. 2015-194223 filed in Japan on September 30, 2015. The contents disclosed by the basic application are cited in the specification, claims and drawings of the present application.

  The present invention can be applied not only to an endoscope control device in the medical field but also to an endoscope control device in an industrial field.

Claims (5)

An operation unit;
An insertion portion connected to the distal end side of the operation portion so as to be rotatable around a longitudinal axis;
A conversion unit that is provided at a base end of the insertion unit and converts the rotation of the insertion unit into a displacement in the direction of the longitudinal axis;
A first extending portion extending from the distal end portion toward the proximal end side along the longitudinal axis; and a first end of the first extending portion. And an offset portion that is offset in a direction orthogonal to the direction of the longitudinal axis, and that is connected to the second end of the offset portion and that is proximal to the longitudinal axis. A second extending portion extending to the longitudinal axis, and the displacement caused by the converting portion is transferred to the longitudinal axis via the first extending portion, the offset portion, and the second extending portion. A transmission part that transmits in the direction of
A detection sensor that is disposed in the operation portion and detects the displacement transmitted to the second extension portion ;
An endoscope comprising:   The conversion portion has a distal end side connected to the insertion portion, and a proximal end side having an annular inclined surface formed at a predetermined angle with respect to the longitudinal axis. The endoscope according to claim 1, wherein the endoscope is rotated. The transmission unit, while being contact is biased toward the inclined surface of the tip the converting unit, by the detection sensor position is changed in the longitudinal axis direction in response to rotation of the slopes The endoscope according to claim 2, further comprising a detected portion whose position is detected.   The endoscope according to claim 3, wherein the transmission unit is urged in a distal direction of the longitudinal axis by an urging spring. The conversion part has a tilted cam groove having a distal end side connected to the insertion part and formed on the base end side peripheral surface at a predetermined angle with respect to the longitudinal axis.
The transmission portion has a cam follower that is cam-coupled to the inclined cam groove,
The endoscope according to claim 1, wherein the transmission portion is displaced in a longitudinal axis direction as the cam follower moves along the inclined cam groove by the rotation of the insertion portion.

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