JP5457318B2 - Endoscope - Google Patents

Description

  The present invention relates to an endoscope capable of adjusting a protruding length of an insertion portion with respect to an operation portion.

  The medical endoscope includes an insertion portion that is inserted into the body and an operation portion that is provided on the proximal end side of the insertion portion. The insertion portion is provided with a distal end hard portion, a bending portion, and a flexible tube portion in order from the distal end. The distal end hard portion is provided with an objective lens, a solid-state imaging device such as a CCD, and an illumination lens. The hard tip portion is formed of a hard resin material in order to protect each lens and the solid-state imaging device.

  In the insertion portion, a wire for bending the bending portion, an image signal from the solid-state image sensor, a signal cable for transmitting a control signal for driving the solid-state image sensor, and illumination light from the light source device are transmitted. A long built-in object such as a forceps channel for guiding a treatment tool such as a light guide and forceps for transmission to the illumination window to a forceps outlet provided at the distal end hard portion is inserted.

  The flexible tube portion is formed in a long tubular shape and has flexibility, and connects between the operation portion and the bending portion. This flexible tube is covered with a cylindrical mesh formed by braiding a metal wire or resin wire on a screw tube formed by spirally winding a metal strip, and a base is fitted to both ends. In addition, it is composed of a flexible tube whose outer peripheral surface is covered with an outer skin layer made of resin. Since the flexible tube has a flexible structure, the size may vary.

  In the endoscope assembly process including the step of connecting the individually assembled insertion section and the operation section housing in the endoscope production line, the above-described wires, signal cables, light guides, forceps channels, etc. are built-in. Insert the object into the housing, and fix the base end of the flexible tube that constitutes the insertion part to the distal end of the housing. In some cases, a built-in object may not reach a predetermined position such as an operation unit or a connector. In such a case, it was necessary to cut or adjust the length of the built-in object, or to start from the process of assembling the insertion portion, which was very time-consuming.

  Moreover, in an endoscope, the dimension of a flexible tube or a built-in thing may change with aged deterioration. Therefore, during the maintenance work of the endoscope, the length of the built-in object must be adjusted in accordance with the dimensional change due to aging, and the maintenance work is troublesome as in the assembly process.

  Therefore, Patent Document 1 describes an endoscope having a mechanism for changing the protrusion length of the insertion portion with respect to the operation portion so that maintenance work can be facilitated. In an endoscope having this mechanism, a male screw portion that is a reverse screw is formed on the outer periphery of the butt end portion of each portion obtained by dividing the flexible tube near the base end, and is screwed into each of the male screw portions. An adjustment ring is provided. On the base end side and the distal end side inner periphery of the adjustment ring, female screw portions that are screwed with the male screw portions of the reverse screw are formed. When the adjustment ring is rotated, the male screw portions are in a reverse screw relationship with each other, and therefore, the portions obtained by dividing the flexible tube can be separated or brought close to each other. When the built-in object in the insertion part becomes slack or does not reach the specified position during the assembly process or maintenance work, the operator changes the protrusion length of the insertion part with respect to the operation part by rotating the adjustment ring. To do.

Japanese Patent Laid-Open No. 62-164432

  However, in the endoscope described in the above-mentioned Patent Document 1, since each female screw portion that is a reverse screw is formed on the inner peripheral surface of the adjustment ring, the adjustment allowance when changing the protruding length of the insertion portion is The axial length of the adjusting ring is limited to a dimension obtained by subtracting the axial length necessary for screwing the adjusting ring and each male screw portion. Therefore, there is a case where the adjustment allowance is insufficient for removing the slack of the built-in object or adjusting the protruding length of the insertion part until the built-in object reaches a predetermined position of the operation unit or the connector. In addition, the inner space for arranging components is limited on the distal end side of the operation portion where the adjustment ring is arranged. Therefore, it has been difficult to increase the axial length of the adjustment ring in order to increase the adjustment allowance.

  The present invention has been made in consideration of the above circumstances, and an object of the present invention is to provide an endoscope that can sufficiently secure an adjustment allowance for adjusting the protrusion length of the insertion portion with respect to the operation portion.

The endoscope of the present invention includes an insertion portion provided with a distal end rigid portion, a bending portion, and a flexible tube portion in order from the distal end side, an operation portion provided on a proximal end side of the insertion portion, the insertion portion, A long built-in object inserted into the operation portion and having an end portion fixed to the distal end hard portion, an insertion portion side connecting member to which a base end portion of the insertion portion is fixed, and a housing of the operation portion And the first female screw portion formed on the outer peripheral surface, the first female screw portion being a reverse screw with respect to the first female screw portion. One of the insertion part side connection member and the operation part side connection member and the first female screw part are screwed together, and the other of the insertion part side connection member and the operation part side connection member and the first male part are and an adjustment ring which threaded portion is screwed, the first female threaded portion is formed over the entire length of the inner circumferential surface of said adjustment ring, said first Male screw portion of the is characterized by being formed over the entire length of the outer circumferential surface of said adjustment ring.

  The insertion portion side connection member is formed with a second male screw portion that is screwed with the first female screw portion, and the operation portion side connection member is a second screw screwed with the first male screw portion. It is preferable that a female screw portion is formed.

  In the adjustment ring, it is preferable that a pitch of the first female screw portion is different from a pitch of the first male screw portion. In the adjustment ring, it is preferable that the pitch of the first female screw portion is wider than the pitch of the first male screw portion.

According to the present invention, the proximal end portion of the insertion portion is fixed to the insertion portion side connection member, the operation portion side connection member is fixed to the housing of the operation portion, and the first female screw portion is the inner peripheral surface. is formed over the entire length of, said first female screw portion of the adjusting ring the first male screw portion which is opposite the screw relative to the first female threaded portion is formed over the entire length of the outer peripheral surface One of the insertion portion side connection member and the operation portion side connection member is screwed, and the first male screw portion and the other of the insertion portion side connection member and the operation portion side connection member are screwed. Ensuring sufficient adjustment allowance to adjust the projection length of the insertion part relative to the part, and without adjusting the length of the long built-in object inserted in the insertion part, the assembly process and maintenance process of the endoscope It can be done easily.

It is explanatory drawing which shows the structure of an endoscope roughly. It is explanatory drawing which shows the front-end | tip of a front-end | tip hard part. It is principal part sectional drawing which looked at the inside of the flexible tube part from the axial direction. It is principal part sectional drawing which looked at the inside of an insertion part and an operation part from radial direction. It is a perspective view which shows the structure of a protrusion length adjustment part. It is sectional drawing which shows the structure of an adjustment ring. It is explanatory drawing for demonstrating the adjustment allowance of a protrusion length adjustment part.

  In FIG. 1, an endoscope 10 includes an insertion portion 11 that is inserted into a body (for example, the large intestine), and an operation portion 12 that is connected to the insertion portion 11. A universal cord 13 is connected to the operation unit 12, and a light source connector 14 is provided at the tip of the universal cord 13. A cable 15 is branched from the light source connector 14, and a processor connector 16 is provided at the tip of the cable 15. The light source connector 14 and the processor connector 16 are detachably connected to the light source device 17 and the processor device 18, respectively.

  The operation unit 12 includes an angle knob 20 and a forceps port 23 through which a treatment tool such as an air / water feed button 21 for sucking air and water from the distal end of the insertion unit 11, a suction button 22, and an electric knife is inserted. Is provided. The forceps port 23 is connected to a forceps channel 24 (see FIGS. 3 and 4) arranged in the insertion portion 11.

  The insertion portion 11 is composed of a distal end rigid portion 25, a bendable bending portion 26, and a flexible flexible tube portion 27 in order from the distal end. The flexible tube portion 27 has a length of about 1.3 m to 1.6 m so that the distal end hard portion 25 reaches a target position in the body. The distal end hard portion 25 is formed of a hard resin or metal material, and the bending portion 26 is bent in the vertical and horizontal directions as an operation wire 45 described later is pushed and pulled in conjunction with the operation of the angle knob 20.

  As shown in FIG. 2, an observation window 31, an illumination window 32, an air / water supply nozzle 33, and a forceps outlet 34 are exposed on the distal end surface 25 a of the distal rigid portion 25. Two illumination windows 32 are arranged at symmetrical positions with respect to the observation window 31. The observation window 31 is provided with a part of an imaging lens for taking in image light of a site to be observed in the body cavity. An imaging element such as a CCD or a CMOS image sensor that captures an image of a site to be observed is incorporated in the back of the imaging lens.

  The illumination window 32 incorporates a part of an illumination lens. Behind the illumination lens, an emission end of a light guide 42 (see FIGS. 3 and 4) for guiding illumination light from an irradiation light source of the light source device 17 is disposed. The forceps outlet 34 communicates with a forceps port 23 provided in the operation unit 12 via the forceps channel 24. The air / water supply nozzle 33 injects cleaning water and air for removing dirt from the observation window 31 by operating the air / water supply button 21 provided in the operation unit 12.

  As shown in FIGS. 3 and 4, the flexible tube 36 constituting the flexible tube portion 27 includes a cylindrical mesh body 38 formed by braiding a metal wire or a resin wire on a screw tube 37 positioned on the innermost side. The cap 39 is fitted to both ends, and the outer peripheral surface thereof is covered with the outer skin layer 40 made of resin. The screw tube 37 is formed by spirally winding a metal belt-like material, and has flexibility and protects the inside.

  The flexible tube portion 27 is configured by loosely inserting a plurality of built-in objects such as the light guide 42, the forceps channel 24, the air / water supply channel 43, the multicore cable 44, and the operation wire 45 into the flexible tube 36. It has become.

  One end of the multi-core cable 44 is connected to the image sensor, and mainly transmits a signal for driving the image sensor from the processor device 18 and also transmits an image signal obtained from the image sensor to the processor device 18. It is a cable and has a cross-sectional shape in which a plurality of signal lines are covered with a protective coating. The processor device 18 performs various image processing on the image signal from the image sensor received via the multi-core cable 44 to convert it into a video signal, and this is converted into an observation image on the cable-connected monitor 46 (see FIG. 1). Display.

  One end of the long built-in object such as the light guide 42, the forceps channel 24, the air / water supply channel 43, the multi-core cable 44, and the operation wire 45 that is loosely inserted into the flexible tube 36 is the tip. It is fixed to the hard part 25. The other ends of the forceps channel 24 and the air / water supply channel 43 are fixed inside the operation unit 12. The light guide 42 and the multi-core cable 44 pass through the operation unit 12 and the universal cord 13, the other end of the light guide 42 is fixed inside the connector 14, and the multi-core cable 44 is further connected to the connector 14 and the cable. The other end is fixed inside the connector 16 through the inside of the connector 15.

  As shown in FIGS. 4 and 5, a protrusion length adjusting portion 50, a protective member 51, and a bend preventing rubber 52 are provided on the distal end side of the housing 49 of the operation portion 12. The insertion portion 11 is connected to the housing 49 via the protrusion length adjustment portion 50. The housing 49 is assembled with an angle knob 20, an air / water supply button 21, a suction button 22, and the like, and a bending operation mechanism (not shown) that pushes and pulls the operation wire 45 in accordance with the operation of the angle knob 20. Built in. The other end of the operation wire 45 is connected to the bending operation mechanism inside the housing 49.

  The protrusion length adjustment unit 50 includes an insertion unit side connection member 53, an operation unit side connection member 54, an adjustment ring 55, and lock nuts 56 and 57. The adjustment ring 55 has a cylindrical shape in which a first female screw portion 61 is formed on the inner peripheral surface, and a first male screw portion 62 that is a reverse screw with respect to the first female screw portion 61 is formed on the outer peripheral surface. The first female screw portion 61 is screwed with the insertion portion side connecting member 53, and the first male screw portion 62 is screwed with the operation portion side connecting member 54. Note that the reverse screw indicates a relationship in which when one is a right screw, the other is a left screw and when one is a left screw, the other is a right screw.

  The insertion portion side connection member 53 has an insertion portion holding portion 63 on the inner peripheral surface, and a substantially cylindrical shape having a second male screw portion 64 that is screwed with the first female screw portion 61 of the adjustment ring 55 on the outer peripheral surface. It is formed in a shape. The insertion portion holding portion 63 is opened from the distal end 53 a of the insertion portion side connection member 53, and the inner diameter is formed to match the outer diameter of the flexible tube 36. The inner peripheral surface of the insertion portion side connection member 53 has a smaller inner diameter at a position closer to the proximal end than the insertion portion holding portion 63, and has a step 65 at the boundary with the insertion portion holding portion 63. The insertion portion 11 is fixed to the insertion portion side connection member 53 by, for example, screwing or the like, by being pushed to a position where the proximal end portion of the flexible tube 36 is fitted into the insertion portion holding portion 63 and hits the step 65. .

  The insertion portion side connection member 53 includes a flange portion 66 that protrudes radially outward from the outer peripheral surface and along the distal end 53a. Further, the outer peripheral surface of the flange portion 66 is recessed in a circumferential shape. A groove 66a is formed. A waterproof O-ring 67 is fitted in the groove 66a. The O-ring 67 is made of an elastic member such as rubber and keeps the space between the O-ring 67 and the protective member 51 watertight.

  The operation portion side connection member 54 has a second female screw portion 68 that is screwed with the first male screw portion 62 of the adjustment ring 55 formed on the inner peripheral surface, and a flange portion 69 formed on the outer peripheral surface. The operation portion side connection member 54 is fixed to the housing 49 by screwing or the like with a flange portion 69 fitted into the opening 49 a of the housing 49.

  As described above, in the adjustment ring 55, the first female screw portion 61 is screwed with the second male screw portion 64 of the insertion portion side connection member 53, and the first female screw portion 61 is reversely threaded. Since the first male screw portion 62 thus formed is screwed with the second female screw portion 68 of the operation portion side connection member 54, the adjustment ring 55 is connected to the insertion portion side connection member 53 and the operation portion side connection member 54. By rotating the connecting portion side connecting member 53 and the operating portion side connecting member 54, the interval between the inserting portion side connecting member 53 and the operating portion side connecting member 54 can be separated or brought close to each other. Thereby, the protrusion length of the insertion part 11 with respect to the operation part 12 can be adjusted. The adjustment ring 55 is disposed at a position where the first female screw portion 61 and the second male screw portion 62 overlap each other in the axial direction of the adjustment ring 55. In this embodiment, the inner peripheral surface of the adjustment ring 55 is arranged. The first female screw portion 61 is formed over the entire length of the first outer peripheral surface, and the first male screw portion 62 is formed over the entire length of the outer peripheral surface.

Further, since the adjustment ring 55 has the first female screw portion 61 on the inner peripheral surface and the first male screw portion 62 on the outer peripheral surface, the first female screw portion 61 and the first male screw portion 62 are provided. The forming process can be easily performed, and the degree of freedom in designing the pitch of the first female screw portion 61 and the first male screw portion 62 is high. As shown in FIG. 6, in this embodiment, the adjustment ring 55 is formed such that the pitch P _A of the first female screw portion 61 is wider than the pitch P _{B of} the first male screw portion 62. More specifically, the pitch ratio P _A : P _B = 2: 1 of the first female screw portion 61 and the first male screw portion 62 is set. Thereby, the movement amount with respect to the rotation amount of the adjustment ring 55 is larger in the insertion portion side connection member 53 and smaller in the operation portion side connection member 54.

  As shown in FIGS. 4 and 5, the lock nuts 56 and 57 are used as a measure for preventing the adjustment ring 55 and the operation unit side connection member 54 from loosening. The lock nuts 56 and 57 are screwed into the second male screw portion 64 and the first male screw portion 62 so as to face the adjustment ring 55 and the distal end surface of the operation portion side connecting member 54, respectively. Accordingly, the adjustment ring 55 is less likely to loosen with respect to the insertion portion side connection member 53, and the operation portion side connection member 54 is less likely to loosen with respect to the adjustment ring 55.

  The protection member 51 is disposed at the distal end portion of the housing 49 and covers the outer peripheral surface of the protrusion length adjusting portion 50. The protection member 51 is fixed by, for example, screwing to the distal end portion of the housing 49. In the protection member 51, a moving passage 70 through which the insertion portion side connecting member 53 moves is formed on the distal end side of the inner peripheral surface. The above-described O-ring 67 is in close contact with the moving passage 70. Thereby, it becomes a watertight structure in the front end side of the operation part 12, and prevents a bodily fluid and water from entering the inside of the operation part 12. Since the moving passage 70 is formed in accordance with the outer diameter of the O-ring 67 fitted to the insertion portion side connection member 53, the adjustment ring 55 having a larger outer diameter than the insertion portion side connection member 53 is The inside of the movement path 70 cannot be moved.

  The anti-breaking rubber 52 is provided so as to cover the vicinity of the proximal end portion of the flexible tube 36 from the outer peripheral surface of the protective member 51, and the outer diameter gradually decreases from the housing 49 side toward the flexible tube 36 side. It is formed to do.

  An assembly process for assembling the endoscope 10 after assembling the above-described configuration individually for each component will be described. At this time, the insertion portion 11 includes the distal end hard portion 25, the bending portion 26, and the flexible tube portion 27, and the distal end rigid portion 25 incorporates components such as an imaging lens, an imaging element, and an illumination lens. One end of a long built-in object such as the light guide 42, the forceps channel 24, the air / water supply channel 43, the multi-core cable 44, the operation wire 45, etc. is fixed. It is in an interpolated state. Further, the operation unit 12 is in a state in which the protrusion length adjustment unit 50 is coupled to the housing 49, that is, the operation unit side connection member 54 is fixed to the housing 49, and the insertion unit side connection member 53 is connected via the adjustment ring 55. And the operation part side connection member 54 are connected, and the lock nuts 56 and 57 are used to prevent loosening. For example, the protrusion length adjusting unit 50 is adjusted so as to be positioned at an intermediate position between adjustment positions, that is, a position where the distance between the insertion portion side connecting member 53 and the operation portion side connecting member 54 is the farthest and the closest position. The position of the ring 55 is adjusted. At this time, the protective member 51 and the folding stop rubber 52 are not attached to the housing 49 and the protrusion length adjusting unit 50. Furthermore, the bending operation mechanism that pushes and pulls the operation wire 45, the angle knob 20, the buttons 21 and 22, and the like are not yet assembled to the housing 49.

  The worker in the assembly process first inserts the internal portion of the insertion portion 11 into the housing 49 through the insertion portion side connection member 53, the operation portion side connection member 54, and the adjustment ring 55. Further, the insertion portion 11 is pushed to the housing 49 side, the proximal end portion of the flexible tube 36 is fitted into the insertion portion holding portion 63, and the flexible tube 36 is pushed to a position where it abuts against the step 65 to insert the flexible tube 36 into the insertion portion side connecting member 53. To fix. As a result, the insertion portion 11 and the housing 49 are connected via the protrusion length adjustment portion 50.

  After loosening the lock nuts 56 and 57 in a state where the insertion portion 11 and the housing 49 are connected, the adjustment ring 55 of the protrusion length adjustment portion 50 is rotated to adjust the protrusion length of the insertion portion 11 with respect to the operation portion 12. To do. At this time, a long built-in object is inserted into the housing 49. The operator measures the length of the built-in object inserted into the housing 49 or the length of the built-in object protruding from the housing 49, and according to these lengths, the operator adjusts the length of the insertion part 11 by the protrusion length adjusting part 50. Adjust the protrusion length. That is, if the built-in object is slack, the insertion part-side connection member 53 and the operation part-side connection member 54 are pulled away from each other. On the other hand, if the built-in object does not reach the predetermined position, the insertion part-side connection member The adjustment ring 55 is rotated in a direction in which the operation unit 53 and the operation unit side connection member 54 are brought closer to each other, and the protruding length of the insertion unit 11 with respect to the operation unit 12 is adjusted. After the adjustment by the protrusion length adjusting portion 50, the lock nuts 56 and 57 are tightened to prevent loosening, and the protective member 51 and the folding stop rubber 52 are attached to the outer peripheral surface of the protrusion length adjusting portion 50, and the bending operation mechanism The endoscope 10 is assembled by assembling the angle knob 20, the buttons 21, 22 and the like to the housing 49 and further connecting cables and connectors.

  As described above, since the first female screw portion 61 and the first male screw portion 62 are formed on the inner peripheral surface and the outer peripheral surface of the adjustment ring 55, the protruding length of the insertion portion 11 with respect to the operation portion 12. It is possible to secure a sufficient adjustment allowance when adjusting. In the present embodiment, since the first female screw portion 61 and the first male screw portion 62 are formed so as to overlap in the axial direction of the adjustment ring 55, the adjustment allowance can be further secured. In addition, in FIG. 7, the adjustment allowance L in the protrusion length adjustment part 50 of this embodiment is shown. The adjustment allowance L is such that when the protrusion length is changed by the protrusion length adjusting portion 50, the insertion portion 11 is located at the most distal position (the position shown in FIG. It is the difference from the position (position shown in FIG. 7B). In FIG. 7, in order to prevent complication of the drawing, the internal components of the insertion portion 11 are omitted.

  In conventional endoscopes, female threads that are reversely threaded are formed only on the inner peripheral surface of the adjustment ring, so the axial length of each male thread is screwed from the axial length of the adjustment ring. However, in this embodiment, an adjustment allowance greater than the axial length of the adjustment ring 55 can be ensured.

  Further, in the present embodiment, the second male screw part 64 screwed with the first female screw part 61 is connected to the insertion part side connecting member 53 with the second female screw part screwed with the first male screw part 62. The portion 68 is formed in the operation portion side connecting member 54. That is, since the insertion portion side connection member 53 is located on the inner peripheral surface side of the adjustment ring 55 and the operation portion side connection member 54 is located on the outer peripheral surface side of the adjustment ring 55, a wide internal space of the operation portion side connection member 54 is formed. It is also possible to arrange parts other than the built-in components of the flexible tube 36, such as a guide plate for guiding the operation wire 45, a member for fixing or protecting the light guide 42 and the multi-core cable 44, and the like. .

Further, as described above, since the protective member 51 is in close contact with the O-ring 67 fitted to the insertion portion side connecting member 53, the inner diameter of the moving passage 70 on the distal end side is formed small. so as not to move within the moving passage 70, but the adjusting ring 55 of the present embodiment, the pitch P _a of the first female screw portion 61 is greater than the pitch P _B of the first male screw portion 62 Thus, as the relative movement amount with respect to the operation portion side connection member 54, the insertion portion side connection member 53 can be moved largely with respect to the movement amount of the adjustment ring 55. Therefore, the moving passage 70 can be formed long, and the adjustment ring 55 can be moved at a position that does not interfere with the moving passage 70. In this way, by forming the moving passage 70 in close contact with the O-ring 67 long, the water tightness of the operation unit 12 can be maintained within the entire adjustment range L of the protrusion length adjusting unit 50.

  In the above embodiment, the case where the projection length of the insertion portion 11 with respect to the operation portion 12 is adjusted according to the length of the built-in portion of the insertion portion 11 during the assembly process of the endoscope 10 is illustrated. However, the present invention is not limited to this, and can also be applied to the adjustment according to the dimensional change of the flexible tube 36 or the built-in object due to aging during maintenance work. In this case, the protective member 51 and the anti-bending rubber 52 are removed or shifted to the distal end side of the insertion portion 11 to expose the adjustment ring 55 of the protrusion length adjustment portion 50 and rotate the adjustment ring 55 to the operation portion 12. The protruding length of the insertion portion 11 can be easily adjusted.

In the above embodiment, the first female screw portion 61 and the insertion portion side connection member 53 of the adjustment ring 55 are screwed together, and the first male screw portion 62 and the operation portion side connection member 54 are screwed together. However, the present invention is not limited to this, and the first male screw portion 62 and the insertion portion side connection member 53 of the adjustment ring 55 are screwed together, and the first female screw portion 61 and the operation portion side connection member 54 are screwed. You may make it match. In the above embodiment, the pitch P _A of the first female screw portion 61 of the adjustment ring 55, but is formed larger than the pitch P _B of the first male screw portion 62, the first male threaded portion The pitch P _{B of} 62 may be formed larger than the pitch P _{A of} the first female screw portion 61.

  Further, in the above-described embodiment, an electronic endoscope that observes an image obtained by imaging the state of a subject using an imaging element is described as an example. However, the present invention is not limited to this and is not limited to an optical endoscope. The present invention can also be applied to an endoscope that observes the state of a subject by using a general image guide.

DESCRIPTION OF SYMBOLS 10 Endoscope 11 Insertion part 12 Operation part 25 Tip hard part 26 Bending part 27 Flexible tube part 36 Flexible tube 49 Housing 50 Projection length adjustment part 53 Insertion part side connection member 54 Operation part side connection member 55 Adjustment ring 61 1st 1 female screw portion 62 first male screw portion 64 second male screw portion 68 second female screw portion

Claims (4)

An insertion portion provided with a distal end rigid portion, a bending portion, and a flexible tube portion in order from the distal end side;
An operation part provided on the proximal end side of the insertion part;
A long built-in object that is inserted into the insertion portion and the operation portion, and an end portion is fixed to the distal end hard portion;
An insertion portion side connecting member to which a base end portion of the insertion portion is fixed;
An operation unit side connection member fixed to the housing of the operation unit;
A first female screw portion is formed on the inner peripheral surface, and a first male screw portion that is a reverse screw with respect to the first female screw portion is formed on the outer peripheral surface, and the insertion portion side connecting member and the operation portion One of the side connection members and the first female screw part are screwed together, and the other of the insertion part side connection member and the operation part side connection member and the adjustment ring in which the first male screw part is screwed are provided. ,
The first female screw portion is formed over the entire length of the inner peripheral surface of the adjustment ring, and the first male screw portion is formed over the entire length of the outer peripheral surface of the adjustment ring. Features an endoscope. The insertion portion side connection member is formed with a second male screw portion that is screwed with the first female screw portion, and the operation portion side connection member is a second screw screwed with the first male screw portion. The endoscope according to claim 1, wherein a female screw portion is formed. The endoscope according to claim 1 or 2, wherein the adjustment ring has a pitch of the first female screw portion and a pitch of the first male screw portion different from each other. The endoscope according to any one of claims 1 to 3, wherein the adjustment ring has a pitch of the first female screw portion larger than a pitch of the first male screw portion.

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