Endoscope and treatment tool erection mechanism

Abstract

Provided are an endoscope and a treatment tool raising mechanism that are capable of achieving improvement in accessibility for a cleaning brush, prevention against the abrasion of a distal portion main body, and prevention of a treatment tool from crawling under an operation wire. When viewed from a second direction perpendicular to both the longitudinal axis of the distal portion main body and a first direction perpendicular to the longitudinal axis, a wire distal portion of the operation wire connected to a wire connecting portion of a treatment tool raising base is positioned on the side opposite to a raising base main body of the treatment tool raising base. A second wall portion of a member forming a raising base housing space includes: a first wall surface at least a part of which has a shape conforming to a path of the wire connecting portion pivoting about the rotation axis; and a second wall surface provided at a position on one side of the first wall surface in the first direction and having a shape conforming to a path of the raising base main body pivoting about the rotation axis. When viewed from the second direction, the second wall surface overlaps with at least a part of the wire distal portion in the first direction.

Description

[Technical Field]

[0001] The present invention relates to an endoscope and a treatment tool erection mechanism that are provided with a treatment tool erection base that changes the direction in which a treatment tool is introduced at the distal end of an insertion section. [Background technology]

[0002] In endoscopes, various treatment tools are introduced through a treatment tool introduction port provided in the operating section and then led out through a treatment tool lead-out port opened at the tip of the insertion section for use in treatment. For example, treatment tools such as guidewires or contrast tubes are used in duodenoscopes. Treatment tools such as puncture needles are used in ultrasound endoscopes. Treatment tools such as forceps or snares are used in other direct-viewing endoscopes and oblique-viewing endoscopes. It is necessary to change the lead-out direction of such treatment tools at the tip in order to treat a desired location within the subject. For this reason, a treatment tool erection mechanism that changes the lead-out direction of the treatment tool is provided at the tip of the insertion section (see Patent Document 1). This treatment tool erection mechanism has a treatment tool erection base and changes the posture of the treatment tool erection base between an erect position and a reclined position.

[0003] Known treatment instrument erection mechanisms include a wire-pulling (open type) mechanism in which the tip of a control wire is directly attached to the erection table and the base end of the control wire is connected to an operation lever provided in the operation unit (see Patent Documents 2 to 4). This mechanism rotates the erection table around a rotation axis by pushing and pulling the control wire with the operation lever, thereby changing the posture of the erection table between an erect position and a reclined position.

[0004] In such a wire-pulling type mechanism, the operating wire is exposed in the stand accommodation space that accommodates the treatment instrument stand, and therefore there is a risk that the treatment instrument may slip under the operating wire.

[0005] Therefore, Patent Document 5 discloses an endoscope including a treatment instrument stand, a manipulation wire fixed to a side portion of the treatment instrument stand, and a distal end body including a pair of side walls that form a manipulation instrument stand accommodation space that accommodates the treatment instrument stand. Of the pair of side walls of the distal end body described in Patent Document 5, the side wall facing the side portion of the treatment instrument stand (hereinafter referred to as the opposing side wall) has a shape that fills the gap below the manipulation wire. This opposing side wall prevents the treatment instrument from slipping under the manipulation wire. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Special Publication No. 2019-531145 [Patent Document 2] Utility Model Registration No. 2604553 [Patent Document 3] Japanese Patent Application Publication No. 5-56913 [Patent Document 4] Japanese Patent Application Publication No. 6-315458 [Patent Document 5] Japanese Patent Application Publication No. 8-154890 Summary of the Invention [Problem to be solved by the invention]

[0007] In the endoscope described in Patent Document 5, opposing side walls are provided to fill the gap below the operating wire, narrowing the space between the pair of side walls of the distal end body (the space for accommodating the stand), making it difficult for the cleaning brush to access the space between the pair of side walls. Furthermore, when the treatment instrument stand is displaced between the upright position and the reclined position via the operating wire, the operating wire slides against the upper surfaces of the opposing side walls. As a result, repeated displacement of the treatment instrument stand causes wear on the opposing side walls of the distal end body.

[0008] The present invention has been made in consideration of the above circumstances, and aims to provide an endoscope and treatment tool erection mechanism that can improve the accessibility of the cleaning brush, prevent wear on the tip body, and prevent the treatment tool from slipping under the operating wire. [Means for solving the problem]

[0009] an endoscope for achieving the object of the present invention comprises an operating section provided with an operating member, an insertion section provided on the distal side of the operating section and inserted into a subject, a distal main body located at the distal end of the insertion section, an erector accommodating space forming member detachably attached to the distal main body and forming a erector accommodating space, a base end wall section provided on the distal main body or the erector accommodating space forming member and having an outlet for a treatment tool, a first wall section extending from the base end wall section towards the distal side of the distal main body and located on one side of the outlet in a first direction perpendicular to the longitudinal axis of the distal main body, a second wall section provided on the erector accommodating space forming member and forming the erector accommodating space together with the base end wall section and the first wall section, the second wall section facing the first wall section on the other side of the outlet in the opposite direction to the one side, and an endoscope disposed within the erector accommodating space and rotatable between a collapsed position and an erector position around a rotation axis parallel to the first direction. and a treatment tool stand that is rotatable between the first and second axes and includes a stand main body portion rotatably held on a rotation axis, a stand tip portion provided at the tip side of the stand main body portion, and a wire connection portion provided at the stand tip portion, and an operation wire that is connected to the wire connection portion and rotates the treatment tool stand, wherein when viewed from a second direction perpendicular to both the longitudinal axis and the first direction, the wire tip portion of the operation wire connected to the wire connection portion is located on the other side of the stand main body portion, and the second wall portion has a first wall surface that has a shape that follows at least a portion of the trajectory of the wire connection portion that rotates around the rotation axis, and a second wall surface that is located on one side of the first wall surface and has a shape that follows the trajectory of the stand main body portion that rotates around the rotation axis, and when viewed from the second direction, the second wall surface overlaps with at least a portion of the wire tip portion in the first direction.

[0010] According to this endoscope, the second wall surface can prevent the treatment tool from slipping under the wire tip of the operation wire.

[0011] In an endoscope according to another aspect of the present invention, the wire distal end portion has a shape that protrudes from the elevator distal end portion in the other direction beyond the elevator main body portion.

[0012] In an endoscope according to another aspect of the present invention, the second wall surface is provided at a position on one side of the central axis of the wire tip portion when viewed from the second direction, thereby more reliably preventing a treatment tool from slipping under the wire tip portion of the operating wire.

[0013] In an endoscope according to another aspect of the present invention, the second wall portion has a stepped surface formed between the first and second wall surfaces, and the stepped surface has a shape that follows the path of the wire tip portion that rotates around the rotation axis, thereby preventing a treatment tool from slipping under the wire tip portion of the operating wire.

[0014] In an endoscope according to another aspect of the present invention, the step surface is formed in an arc shape when viewed from the first direction, which makes it possible to prevent a treatment tool from slipping under the wire tip of the manipulation wire.

[0015] In an endoscope according to another aspect of the present invention, the first wall surface is provided on the other side of the operating wire when viewed from the second direction, thereby increasing the thickness of the tip of the elevator.

[0016] In an endoscope according to another aspect of the present invention, the tip body has a base end wall and a first wall, and the erector accommodating space forming member is a cap having a second wall.

[0017] In another aspect of the endoscope of the present invention, the distal end of the cap is formed with an opening window that exposes the erector housing space when viewed from the distal end side of the cap. This allows fingers or a jig to pass through the opening window into the erector housing space when attaching or detaching the cap to or from the distal end body, particularly when removing the cap, making it easy to attach or detach the cap. In addition, the opening window can be used to form a stepped surface using a mold.

[0018] In an endoscope according to another aspect of the present invention, the erector accommodating space forming member has a base end wall portion, a first wall portion, and a second wall portion, and is equipped with an ultrasonic transducer provided on the distal end side of the distal end main body.

[0019] An endoscope according to another aspect of the present invention includes an insert molded body in which a treatment instrument stand and an operating wire are integrated.

[0020] In an endoscope according to another aspect of the present invention, the treatment instrument stand and the operation wire are formed as separate bodies.

[0021] a distal end wall portion provided on the distal end body or the erector housing space forming member and having an outlet opening for the treatment tool; a first wall portion extending from the proximal end wall portion toward the distal end of the distal end body and provided at a position on one side of the outlet opening in a first direction perpendicular to the longitudinal axis of the distal end body; a second wall portion provided on the erector housing space forming member and forming the erector housing space together with the proximal end wall portion and the first wall portion, and provided at a position on the other side of the outlet opening opposite the one side in a first direction perpendicular to the longitudinal axis of the distal end body; a treatment tool stand that is rotatable between a collapsed position and an upright position around a rotation axis parallel to a first direction, the treatment tool stand having a stand main body portion rotatably held on the rotation axis, a stand tip portion provided at the tip side of the stand main body portion, and a wire connection portion provided at the tip of the stand, and an operation wire connected to the wire connection portion and rotating the treatment tool stand, wherein when viewed from a second direction perpendicular to both the longitudinal axis and the first direction, the wire tip portion of the operation wire connected to the wire connection portion is located on the other side of the stand main body portion, and the second wall portion has a first wall surface whose shape at least partially follows the trajectory of the wire connection portion which rotates around the rotation axis, and a second wall surface which is located on one side of the first wall surface and has a shape that follows the trajectory of the stand main body portion which rotates around the rotation axis, and when viewed from the second direction, the second wall surface overlaps with at least a portion of the wire tip portion in the first direction.

[0022] In the treatment tool erecting mechanism according to another aspect of the present invention, the second wall surface is provided at a position on one side of the central axis of the wire distal end when viewed from the second direction. [Effects of the Invention]

[0023] The present invention can improve the accessibility of the cleaning brush, prevent wear on the distal end body, and prevent the treatment tool from slipping under the operating wire. [Brief explanation of the drawings]

[0024] [Figure 1] 1 is a configuration diagram of an endoscope system including an endoscope according to the present invention. [Figure 2] FIG. [Figure 3] FIG. [Figure 4] FIG. [Figure 5] FIG. 10 is a perspective view of a cap to which a treatment instrument stand and an operating wire are attached. [Figure 6] FIG. 10 is a top view of a cap to which a treatment instrument stand and an operating wire are attached. [Figure 7] FIG. 10 is a perspective view of the cap from which the treatment instrument stand and the operating wire have been removed. [Figure 8] 10A and 10B are explanatory views for explaining a method for forming the treatment instrument stand and the operation wire. [Figure 9] FIG. [Figure 10] 4 is a cross-sectional view of the distal end of the insertion section taken along line XX in FIG. 3. [Figure 11] FIG. 11 is an enlarged view of a part of FIG. 10. [Figure 12] 12 is a cross-sectional view of the distal end of the insertion section taken along line XII-XII in FIG. 3. [Figure 13] FIG. 10 is a front view of the distal end of the insertion section as seen from a position on the Y(+) direction side of the distal end. [Figure 14] 10A and 10B are explanatory views for explaining the formation of the cap, particularly the formation of the step surface of the second wall portion. [Figure 15] FIG. 10 is a side view of a treatment instrument raising stand according to another embodiment. [Figure 16] FIG. 2 is an exploded perspective view of the distal end 302 of the insertion section of the ultrasonic endoscope 300. [Figure 17]FIG. 2 is an enlarged perspective view of the erection unit 306. [Figure 18] FIG. 18 is a cross-sectional view taken along line XVIII-XVIII in FIG. DETAILED DESCRIPTION OF THE INVENTION

[0025] [Overall configuration of endoscope and endoscope system] 1 is a configuration diagram of an endoscope system 12 including an endoscope 10 of the present invention. The endoscope system 12 includes the endoscope 10, an endoscope processor device 14, and a display 18.

[0026] The endoscope 10 is a side-viewing endoscope used, for example, as a duodenoscope. The endoscope 10 includes an operating section 22 provided with an erection control lever 20, and an insertion section 24 connected to the operating section 22 and inserted into the subject. The erection control lever 20 corresponds to the operating member of the present invention.

[0027] The insertion section 24 is inserted into the subject via the oral cavity, and further inserted through the esophagus, stomach, and duodenum. As a result, a predetermined examination, treatment, or other procedure such as a treatment for the duodenum is performed using a treatment tool (not shown; the same applies below) inserted into the insertion section 24. Examples of the treatment tool include biopsy forceps having a cup at the tip that can collect biological tissue, an EST (Endoscopic Sphincterotomy) knife, and an imaging tube.

[0028] The insertion section 24 has a long axis direction Ax (corresponding to the longitudinal axis of the present invention) extending from the base end side to the tip end side, and is provided with, in this order from the base end side to the tip end side, a flexible section 26, a bending section 28, and an insertion section tip section 30. The detailed configuration of the insertion section tip section 30 will be described later, but first, the general configuration of the insertion section tip section 30 will be described.

[0029] FIG. 2 is a perspective view of the insertion section distal end portion 30. FIG. 3 is a top view of the insertion section distal end portion 30. As shown in FIGS. 2 and 3, the insertion section distal end portion 30 includes a distal end portion main body 32 and a cap 34 detachably attached to the distal end portion main body 32. In addition, a stand accommodating space 66 is formed in the insertion section distal end portion 30 by the distal end portion main body 32 and the cap 34. A treatment tool stand 36 having a treatment tool guide surface 36a is rotatably provided in the cap 34. The treatment tool stand 36 is rotatable between a lying position and an erect position within the erect position accommodating space 66. Note that FIGS. 2 and 3 show the treatment tool stand 36 displaced to the erect position.

[0030] Various components disposed inside the insertion section 24 are connected to or inserted into the insertion section distal end 30. Examples of these components include a treatment tool channel 37 (see FIG. 12), an operating wire 38, a wire channel 40, an air / water supply tube 42, and a cable insertion channel 44.

[0031] The treatment tool channel 37 (see FIG. 12) guides the treatment tool tip (not shown, the same applies below) which is the distal end of the treatment tool, to a treatment tool outlet 60 (see FIG. 4) formed in the distal end body 32. The operation wire 38 is integrally molded with the treatment tool stand 36, and by rotating the treatment tool stand 36, the direction in which the treatment tool tip is led out from the distal end body 32 can be changed. The operation wire 38 is inserted through the wire channel 40. Note that in FIG. 3 and subsequent figures, the wire channel 40 has been omitted as appropriate to avoid complication of the drawings.

[0032] The air and water supply tube 42 supplies air or water supplied from the operation unit 22 to the air and water supply nozzle 58 of the tip body 32. A light guide that guides illumination light supplied from a light source device 15 (see FIG. 1) described below to an illumination window 74 of the tip body 32, and a signal cable of an imaging unit (not shown) arranged inside an observation window 76 are inserted into the cable insertion channel 44.

[0033] In this specification, a three-dimensional Cartesian coordinate system of three mutually orthogonal axial directions (X, Y, and Z directions) will be used for explanation. That is, when looking at the insertion section distal end 30 from the operation unit 22, if the direction in which the treatment tool (not shown) is led out by the treatment tool raising stand 36 is defined as the upward direction, the upward direction is defined as the Z(+) direction, and the opposite downward direction is defined as the Z(-) direction. The rightward direction at this time is defined as the X(+) direction, and the leftward direction is defined as the X(-) direction. The forward direction at this time (the distal end direction in the long axis direction Ax) is defined as the Y(+) direction, and the rearward direction at this time (the proximal end direction in the long axis direction Ax) is defined as the Y(-) direction.

[0034] The X direction, which includes the X(+) direction and the X(-) direction, corresponds to the first direction of the present invention. The Y direction, which includes the Y(+) direction and the Y(-) direction, is parallel to the longitudinal axis direction Ax of the insertion section 24. The Z direction, which includes the Z(+) direction and the Z(-) direction, corresponds to the second direction perpendicular to both the longitudinal axis and the first direction of the present invention.

[0035] Returning to Figure 1, the flexible section 26 has a spiral tube (not shown) made by spirally winding a thin elastic metal strip, a tubular mesh body (not shown) that covers the outside of the spiral tube and is woven with metal wire, and an outer skin (not shown) that covers the outer surface of the mesh body and is made of resin.

[0036] The bending section 28 includes a structure in which a plurality of angle rings (not shown) are rotatably connected to one another, a cylindrical metal wire mesh that covers the outer periphery of the structure, and a rubber outer cover that covers the outer periphery of the mesh. For example, four angle wires (not shown) are arranged from the bending section 28 to a pair of angle knobs 62 of the operation section 22, which will be described later.

[0037] The operating section 22 is configured to have a generally cylindrical shape as a whole. The operating section 22 has an operating section main body 46 and a grip section 48 connected to the operating section main body 46. The proximal end (flexible section 26) of the insertion section 24 is provided on the distal end side of the grip section 48 via an anti-break tube 50.

[0038] The gripping portion 48 is gripped by the surgeon when operating the endoscope 10. A treatment tool introduction port 64 for introducing a treatment tool is provided in this gripping portion 48. The treatment tool introduced from this treatment tool introduction port 64 passes through the treatment tool channel 37 (see FIG. 12) and is led out from the treatment tool lead-out port 60 (see FIG. 4) to the outside.

[0039] The base end of a universal cable 52 is connected to the operation unit body 46. A connector device 54 is provided at the tip end of this universal cable 52. The connector device 54 is connected to the endoscope processor device 14.

[0040] The endoscope processor device 14 includes a light source device 15 and an image processing device 16. The light source device 15 includes a processor-side connector 15A to which a connector device 54 is connected. In addition, the image processing device 16 is connected to a display 18 that displays an image processed by the image processing device 16.

[0041] The connector device 54 and the processor-side connector 15A transmit illumination light, power, imaging signals, etc. contactlessly (wired transmission is also possible) between the endoscope 10 and the endoscope processor device 14. As a result, illumination light from the light source device 15 is emitted from an illumination window 74 (see FIG. 2) provided in the tip body 32 via a light guide (optical fiber cable, not shown). In addition, an imaging signal of an image captured by an imaging unit (not shown) inside the observation window 76 is processed by the image processing device 16 and then displayed as an image on the display 18.

[0042] The operation unit body 46 is provided with an air / water supply button 57, a suction button 59, a pair of angle knobs 62, and a standing operation lever 20.

[0043] Air and water supply button 57 can be pressed in two stages, and is connected to air and water supply tube 42 and an air and water supply source (not shown). When air and water supply button 57 is pressed in the first stage, air is ejected from the air and water supply source through air and water supply tube 42 and air and water supply nozzle 58. When air and water supply button 57 is pressed in the second stage, water is ejected from the air and water supply source through air and water supply tube 42 and air and water supply nozzle 58.

[0044] The suction button 59 is connected to the treatment tool channel 37 (see FIG. 12) and a negative pressure source (not shown). When the suction button 59 is pressed, the negative pressure source sucks air from the treatment tool outlet 60 (see FIG. 4) via the treatment tool channel 37. This allows body fluids such as blood to be sucked from the treatment tool outlet 60.

[0045] The pair of angle knobs 62 are rotatably provided on the same axis in the operation unit main body 46. The pair of angle knobs 62 are connected to the base ends of the angle wires (not shown) opposite to the tip ends thereof connected to the bending portion 28. By rotating each of the pair of angle knobs 62, the angle wires are pushed and pulled, thereby bending the bending portion 28 up and down and left and right.

[0046] The raising operation lever 20 is provided in the operation unit main body 46 so as to be rotatable coaxially with the pair of angle knobs 62, and is turned by the operator's hand while gripping the grip portion 48. The base end of the operation wire 38, which is integrally formed with the treatment instrument elevator table 36, opposite to its distal end, is connected to the raising operation lever 20 via a link mechanism (not shown). As a result, the operation wire 38 is pushed and pulled by turning the raising operation lever 20, and the posture of the treatment instrument elevator table 36 is displaced between a lying position and an erect position (see FIG. 12).

[0047] [Tip configuration] Next, we will explain the detailed structure of the insertion section distal end portion 30. As mentioned above, the insertion section distal end portion 30 includes a distal end portion main body 32, a cap 34 detachably attached to the distal end portion main body 32, and a treatment tool stand 36 integrally formed with an operating wire 38. 。

[0048] <Tip body> 4 is a perspective view of the tip portion main body 32. As shown in FIG. 4 and the already described FIGS. 2 and 3, the tip portion main body 32 is formed in a substantially L-shape when viewed from the Z(+) direction side, and includes a base end wall portion 65 and a first wall portion 68.

[0049] A first wall 68 and an air / water supply nozzle 58 are provided on the distal end surface side on the Y(+) direction side of the distal end body 32. The already-described treatment tool channel 37 (see FIG. 12), wire channel 40, air / water supply tube 42, and cable insertion channel 44 are connected to the proximal end surface side on the Y(-) direction side of the distal end body 32. Furthermore, the distal end body 32 is formed with various through-holes that penetrate the distal end body 32 in the Y direction, such as a treatment tool outlet 60 and a wire insertion hole 61.

[0050] A treatment tool outlet 60 opens in the base end wall portion 65. The treatment tool outlet 60 opens in the stand accommodating space 66, which will be described later, and is connected to the treatment tool channel 37. This allows the treatment tool to be led out from the treatment tool outlet 60 through the stand accommodating space 66 (treatment tool stand 36) to the outside.

[0051] The wire insertion hole 61 is formed at a position shifted in the X(+) direction and in the Z(+) direction with respect to the treatment tool outlet 60, and the above-mentioned operation wire 38 is inserted through the wire insertion hole 61.

[0052] The first wall 68 is provided on the distal end surface side of the base end wall 65 at a position on the X(-) direction side perpendicular to the longitudinal axis (longitudinal axis direction Ax, Y direction) of the distal end main body 32 relative to the treatment tool outlet 60, and has a shape extending in the Y(+) direction side, which is the distal side of the distal end main body 32. In this case, the X(-) direction side is the direction perpendicular to the longitudinal axis (longitudinal axis direction Ax) of the distal end main body 32, and corresponds to one side of the first direction of the present invention.

[0053] The first wall portion 68 forms an elevator storage space 66 that stores (either completely or partially) the treatment tool elevator 36 between itself and the cap 34, which will be described later. In addition, an illumination window 74 and an observation window 76 are disposed adjacent to each other in the Y direction on the upper surface of the first wall portion 68 on the Z(+) direction side.

[0054] The exit end of the light guide described above is disposed inside the illumination window 74. This allows the illumination window 74 to illuminate the open side of the stand accommodating space 66, i.e., the Z(+) direction side of the stand accommodating space 66.

[0055] An imaging unit (not shown) is provided inside the observation window 76. The imaging unit images a subject present on the Z(+) direction side of the erector housing space 66 through the observation window 76. This imaging unit includes, for example, an imaging optical system (not shown) and a CMOS (complementary metal oxide semiconductor) or CCD (charge coupled device) imaging element (not shown). An imaging signal of the subject output from the imaging element is input to the image processing device 16 via a signal cable (not shown), the connector device 54, and the processor-side connector 15A. As a result, an image of the subject is displayed on the display 18.

[0056] The air and water nozzle 58 is provided on the tip face side of the tip body 32 and on the Z(+) direction side of the first wall portion 68, and sprays air and water toward the observation window .

[0057] <Cap> Fig. 5 is a perspective view of the cap 34 to which the treatment instrument stand 36 and the operation wire 38 are attached. Fig. 6 is a top view of the cap 34 to which the treatment instrument stand 36 and the operation wire 38 are attached. Fig. 7 is a perspective view of the cap 34 from which the treatment instrument stand 36 and the operation wire 38 have been removed.

[0058] 5 to 7 and the above-described Figures 2 and 3, the cap 34, the treatment tool erector 36, and the operating wire 38 are disposable items (replacement items) that are attached to the distal end body 32 before use (treatment, examination, etc.) of the endoscope 10 and are detached from the distal end body 32 and discarded after completion of use. The cap 34, the treatment tool erector 36, and the operating wire 38 constitute the treatment tool erection mechanism of the present invention.

[0059] The cap 34 has a generally cylindrical shape with a bottom, and is detachably attached to the tip body 32. The cap 34 corresponds to the elevator-accommodating space forming member of the present invention, and when attached to the tip body 32, it forms, together with the base end wall 65 and the first wall 68, an elevator-accommodating space 66 (see FIGS. 2 and 3) that accommodates the treatment tool elevator 36. The cap 34 is formed with a first opening window 80, a cap tip 82, an elevator-accommodating portion 84, and a second wall 86.

[0060] When the insertion portion distal end portion 30 is viewed from a position on the Z(+) direction side of the insertion portion distal end portion 30, the first opening window 80 exposes the erector housing space 66 and the upper surface (illumination window 74, observation window 76, etc.) of the first wall portion 68. This makes it possible to lead out a treatment tool from the erector housing space 66 to the Z(+) direction side, and to illuminate and photograph the subject as described above.

[0061] The cap tip portion 82 covers the tip surface on the Y(+) direction side of the tip portion main body 32. This cap tip portion 82 is formed with a second opening window 82a (corresponding to the opening window of the present invention, see FIG. 13) that exposes the erector housing space 66 when viewed from the tip side of the cap 34 (when viewing the cap 34 from a position on the Y(+) direction side of the cap 34). The second opening window 82a has a shape that is suitable for passing a finger or a jig through when attaching or detaching the cap 34 to or from the tip portion main body 32, particularly when removing the cap 34. This makes it easy to attach and detach the cap 34.

[0062] The stand holder 84 (see Figure 7) is formed on the bottom of the inner surface of the cap 34 that defines the bottom surface of the stand storage space 66, and holds the treatment instrument stand 36 rotatably between a collapsed position and an upright position via a rotation shaft 88 (see Figure 12).

[0063] When the cap 34 is attached to the distal end portion main body 32, the second wall portion 86 is disposed on the X(+) direction side of the treatment tool outlet 60 and facing the first wall portion 68, and has a shape that extends in the Y(+) direction, similar to the first wall portion 68. In this case, the X(+) direction side corresponds to the other side of the first direction of the present invention. The second wall portion 86 and the first wall portion 68 define the width of the erector housing space 66 in the X direction. A first wall surface 100, a second wall surface 102, and a step surface 104, which will be described in detail later, are formed on the second wall portion 86 on the side facing the first wall portion 68 and the treatment tool erector 36.

[0064] <Treatment instrument stand and control wire> Fig. 8 is an explanatory diagram for explaining a molding method for the treatment instrument stand 36 and the operation wire 38. As shown in Fig. 8, the treatment instrument stand 36 and the operation wire 38 are an insert-molded body integrated by a known insert molding method.

[0065] Specifically, a pair of first and second molds 200 and 202 are prepared, which, when overlapped, form a cavity (mold) corresponding to the treatment tool stand 36, and the first and second molds 200 and 202 are overlapped. Next, the tip of the operation wire 38 is placed inside the cavity through a through-hole 204 provided in the first mold 200. Then, the material of the treatment tool stand 36 is injected and filled into the cavity, and then cooled to form an insert-molded article of the treatment tool stand 36 and the operation wire 38. Note that the insert-molding method for the treatment tool stand 36 and the operation wire 38 is not limited to the above-mentioned method, and various known insert-molding methods may be used.

[0066] 9 is a perspective view of the treatment tool elevator 36 and the operating wire 38. As shown in FIG. 9 and the above-described FIGS. 2 to 6, the treatment tool elevator 36 has a treatment tool guide surface 36a formed thereon that faces the treatment tool outlet 60 when attached to the tip portion main body 32 together with the cap 34. The treatment tool guide surface 36a changes the traveling direction of the treatment tool tip portion that has been led out from the treatment tool outlet 60 into the elevator storage space 66, toward the first opening window 80 (outside the elevator storage space 66).

[0067] The treatment tool elevator 36 includes an elevator main body 90, an elevator tip 92, and a wire connection part 94. The elevator main body 90 has an insertion hole 90a at its base end through which a rotation shaft 88 (see FIG. 12) is inserted, and is rotatably held by the elevator holder 84 via the rotation shaft 88. The elevator tip 92 is provided on the tip side of the elevator main body 90 (the side opposite to the direction toward the insertion hole 90a and the rotation shaft 88).

[0068] The wire connection part 94 is provided on the side surface on the X(+) direction side of the erector tip part 92, and has a shape that protrudes in the X(+) direction from this side surface and at least further in the X(+) direction than the erector main body part 90. The wire connection part 94 is connected to (holds) the wire tip part 38a, which is the tip part of the operating wire 38.

[0069] The wire tip 38a is connected to the wire connecting portion 94 and is exposed in the erector housing space 66 depending on the posture of the treatment tool erector 36. This wire tip 38a is located on the X(+) direction side of the erector main body 90 when the insertion portion distal end 30 is viewed from a position on the Z(+) direction side (corresponding to the second direction) of the insertion portion distal end 30.

[0070] In this way, when the position of the wire tip 38a (wire connection portion 94) is on the X(+) direction side of the elevator main body 90, if a gap is formed on the Z(-) direction side of the wire tip 38a, there is a risk that the distal end of the treatment tool will slip into this gap. Therefore, in this embodiment, the second wall portion 86 of the cap 34 is formed with a structure (first wall surface 100, second wall surface 102, and step surface 104) that fills the above-mentioned gap.

[0071] <First wall, second wall, and step surface> Fig. 10 is a cross-sectional view of the insertion portion distal end portion 30 taken along line XX in Fig. 3. Fig. 11 is an enlarged view of a portion of Fig. 10. Fig. 12 is a cross-sectional view of the insertion portion distal end portion 30 taken along line XII-XII in Fig. 3. Fig. 13 is a front view of the insertion portion distal end portion 30 as viewed from a position on the Y(+) direction side of the insertion portion distal end portion 30.

[0072] 10 to 13, the first wall surface 100 is formed in the second wall portion 86 at a position facing the wire connecting portion 94 (wire tip portion 38a) of the treatment tool elevator 36 that rotates around the rotation axis 88. That is, the first wall surface 100 is formed at a position on the X(+) direction side of the wire connecting portion 94 and the wire tip portion 38a when the insertion portion distal end portion 30 is viewed from a position on the Z(+) direction side of the insertion portion distal end portion 30. The first wall surface 100 and Wa As the distance in the X direction between the ear tip 38a increases, the width (thickness) in the X direction of the elevator tip 92 including the wire connecting portion 94 can be increased. This improves the fluidity of the material during insert molding of the treatment instrument elevator 36 and the like shown in FIG. 8.

[0073] Furthermore, when the second wall portion 86 is viewed from a position on the X(-) direction side of the second wall portion 86, at least a portion of the first wall surface 100 has a shape that follows the trajectory of the wire connecting portion 94 that rotates around the rotation axis 88. Note that the first wall surface 100 of this embodiment includes a region having a shape that follows the trajectory described above and an extension region that extends from that region toward the tip side [Y(+) direction side] of the insertion portion tip portion 30, but the shape of the first wall surface 100 is not particularly limited as long as it includes at least the former region.

[0074] The second wall surface 102 is formed in the second wall portion 86 at a position facing the elevator main body 90 of the treatment tool elevator 36 that rotates about the rotation shaft 88, and at a position on the X(-) direction side of the first wall surface 100. Specifically, the second wall surface 102 has a shape that follows the trajectory of the elevator main body 90 that rotates about the rotation shaft 88, when the second wall portion 86 is viewed from a position on the X(-) direction side of the second wall portion 86.

[0075] Furthermore, when the insertion portion distal end portion 30 is viewed from a position on the Z(+) direction side (corresponding to the second direction) of the insertion portion distal end portion 30, the second wall surface 102 overlaps at least a part of the wire distal end portion 38a (wire connecting portion 94) in the X direction. Therefore, the second wall surface 102 is formed at a position that fills the gap on the Z(-) direction side of the wire distal end portion 38a. This makes it possible to prevent the distal end of the treatment tool from slipping into this gap.

[0076] At this time, from the viewpoint of reliably preventing the distal end of the treatment tool from slipping into a position on the Z(-) direction side of the wire distal end 38a, it is preferable that the second wall surface 102 be formed at a position (including the position of the central axis CA) on the X(-) direction side of the central axis CA (see FIG. 11) of the wire distal end 38a when viewing the insertion section distal end 30 from a position on the Z(+) direction side of the insertion section distal end 30. In this case, to prevent the second wall surface 102 from interfering with the distal end of a treatment tool with a large diameter, the position of the second wall surface 102 is adjusted to an appropriate position between the central axis CA and the elevator main body 90 in the X direction. The step amount (height difference) in the X direction between the first wall surface 100 and the second wall surface 102 is, for example, 1 to 2 mm.

[0077] The step surface 104 is formed between the first wall surface 100 and the second wall surface 102 and is a connecting surface (boundary surface) connecting the first wall surface 100 and the second wall surface 102. When the second wall portion 86 is viewed from a position on the X(-) direction side of the second wall portion 86, the step surface 104 is formed in an arc shape that follows the trajectory of the wire tip portion 38a that rotates integrally with the wire connecting portion 94 around the rotation shaft 88. As a result, when the treatment tool elevator 36 is displaced between the upright position (see symbol XIIA in FIG. 12) and the reclined position (see symbol XIIB in FIG. 12), the wire tip portion 38a moves along the step surface 104. Therefore, the step surface 104 also functions as a guide surface for the wire tip portion 38a. The wire tip 38a may be in sliding contact with the step surface 104, or a gap may be present between the wire tip 38a and the step surface 104 to the extent that the tip of the treatment tool can be prevented from slipping in.

[0078] 14 is an explanatory diagram for explaining the formation of the cap 34, in particular the formation of the step surface 104 of the second wall portion 86. Note that, in order to prevent the drawing from becoming too complicated, portions of the first mold 210 and the second mold 212 in FIG. 14 that are not related to the formation of the step surface 104 have been omitted as appropriate.

[0079] 14, the cap 34 is formed using a pair of a first mold 210 and a second mold 212. The first mold 210 and the second mold 212 are separable and, when placed together, form a cavity (mold) corresponding to the cap 34. After the material of the cap 34 is injected into this cavity, cooled, and solidified, the first mold 210 and the second mold 212 are separated to form the cap 34.

[0080] In order to form the arc-shaped step surface 104, it is necessary to separate the first mold 210 and the second mold 212 in the Y direction or the Z direction after the material of the cap 34 has solidified, but considering the shape of other parts of the cap 34, it is difficult to separate them in the Z direction.

[0081] Therefore, in this embodiment, a first mold 210 and a second mold 212 that can be separated in the Y direction as shown in Fig. 14 are used. In this embodiment, a second opening window 82a (see Fig. 13) that exposes the stand accommodating space 66 is formed in the cap tip portion 82. Therefore, after the material of the cap 34 has solidified, the mold surface 210a corresponding to the step surface 104 in the first mold 210 can be separated from the step surface 104 in the Y(+) direction through the second opening window 82a.

[0082] As described above, in this embodiment, the second wall surface 102 and the stepped surface 104 formed on the second wall portion 86 of the cap 34 fill the gap that occurs on the Z(-) direction side of the wire tip portion 38a, thereby preventing the distal end of a treatment tool from slipping into a position on the Z(-) direction side of the wire tip portion 38a. Furthermore, by providing the second wall portion 86 (the second wall surface 102 and the stepped surface 104) on the disposable cap 34, it is not necessary to provide a configuration equivalent to the second wall portion 86 on the tip portion body 32, which prevents the accessibility of a cleaning brush to the tip portion body 32 from being impaired after removal of the cap 34. Furthermore, even if the stepped surface 104 wears due to sliding with the wire tip portion 38a, this does not pose a problem because the cap 34 itself is discarded after each use of the endoscope 10. As a result, it is possible to improve the accessibility of the cleaning brush, prevent wear on the tip portion body 32, and prevent the treatment tool from slipping into the Z(-) direction side of the operating wire 38.

[0083] [Treatment instrument stand of another embodiment] Fig. 15 is a side view of a treatment tool stand 36 according to another embodiment. In the above embodiment, the treatment tool stand 36 and the operation wire 38 are integrated by insert molding, but as shown in Fig. 15, the treatment tool stand 36 and the operation wire 38 may be formed separately. In this case, a wire attachment portion 96 to which the wire tip 38a can be attached is formed in the wire connection portion 94 of the treatment tool stand 36. An example of the wire attachment portion 96 is an engagement groove into which the wire tip 38a engages, but the shape and configuration of the wire attachment portion 96 are not particularly limited as long as the wire tip 38a can be attached.

[0084] In the treatment instrument stand 36 of this other embodiment, the first wall surface 100 and Wa As the distance in the X direction between the ear tip 38a increases, the width (thickness) in the X direction of the stand tip 92 including the wire connection portion 94 can be increased, thereby ensuring the rigidity of the treatment instrument stand 36.

[0085] [others] In the above embodiment, a method for forming the treatment instrument stand 36 and the operating wire 38 and a method for forming the cap 34 using various molds have been described, but the methods for forming these are not particularly limited, and various known methods can be used.

[0086] In the above embodiment, the second opening window 82a is formed in the cap tip portion 82, but if the cap 34 can be formed using a mold with an upper and lower separation type, or if the cap 34 is formed by a method other than a mold (for example, a 3D printer), the second opening window 82a does not need to be formed in the cap tip portion 82.

[0087] In the above embodiment, the cap 34, the treatment tool stand 36, and the operation wire 38 are disposable items, but they may be reusable multiple times by being cleaned and disinfected.

[0088] In the above embodiment, the wire connection portion 94 of the treatment tool elevator 36 has a shape that protrudes further in the X(+) direction than the elevator main body 90, but the wire connection portion 94 may be formed in a substantially flat shape on the side surface of the elevator tip 92 on the X(+) direction side (see Patent Documents 3 and 4 above). Even in this case, the second wall surface 102 and the step surface 104 prevent the treatment tool tip from slipping into the Z(-) direction side of the wire tip 38a, which is located further in the X(+) direction than the elevator main body 90.

[0089] In the above embodiment, a side-viewing endoscope (duodenoscope) was used as an example of the endoscope 10, but the present invention can be applied to various endoscopes and their treatment tool erection mechanisms, such as an ultrasonic endoscope, which changes the position of the treatment tool erection table 36 using a wire pulling method.

[0090] [Endoscopic ultrasound] Next, an ultrasonic endoscope 300 (see FIG. 16) to which the present invention is applied and its treatment tool erection mechanism will be described. Note that components that are functionally or structurally identical to those of the endoscope 10 (side-viewing endoscope) of the above embodiment are given the same reference numerals and their description will be omitted. Furthermore, the configuration of the ultrasonic endoscope 300 other than the insertion section distal end 302 of the insertion section 24 is publicly known technology, so a detailed description will be omitted here.

[0091] Fig. 16 is an exploded perspective view of the insertion section distal end portion 302 of the ultrasonic endoscope 300. As shown in Fig. 16, the insertion section distal end portion 302 includes a distal end portion main body 304 (also referred to as a distal end rigid portion) and a standing unit 306 detachably attached to the distal end portion main body 304.

[0092] The tip body 304 includes a transducer attachment portion 304a and a body base portion 304b arranged from the Y(+) direction side to the Y(-) direction side.

[0093] An ultrasonic transducer 308 is attached to the transducer attachment portion 304a. Although not shown, a balloon that covers the ultrasonic transducer 308 can be detachably attached to the transducer attachment portion 304a.

[0094] The ultrasonic transducer 308 is a convex type having an ultrasonic transmission / reception surface on which a large number of ultrasonic vibrators for transmitting and receiving ultrasonic waves are arranged. Note that the structure and function of the ultrasonic transducer 308 are well known, and therefore a detailed description thereof will be omitted here.

[0095] The main body base 304b is provided with an inclined surface 310 extending from the Y(+) direction side toward the Y(-) direction side, and an erection unit mounting hole 312.

[0096] When viewed from the X direction, the inclined surface 310 gradually slopes downward from the Y(-) direction toward the Y(+) direction. The illumination window 74, the observation window 76, and the air / water nozzle 58 are provided on this inclined surface 310.

[0097] The standing unit mounting hole 312 is a rectangular hole that opens on the surface of the main body base 304b on the Z(+) direction side. A standing unit 306, which will be described later, is detachably mounted in this standing unit mounting hole 312. Among the wall surfaces that constitute the standing unit mounting hole 312, the wall surface that defines the Y(-) direction side of the standing unit mounting hole 312 is formed with a treatment instrument insertion port 314 connected to the treatment instrument channel 37 described above and a wire insertion hole 315 connected to the wire channel 40 described above.

[0098] 17 is an enlarged perspective view of the standing unit 306. As shown in FIG. 17 and the previously described FIG. 16, the standing unit 306 corresponds to the standing-table accommodating space forming member of the present invention, has a standing-table accommodating space 318, and rotatably holds the previously described treatment instrument standing table 36. The standing unit 306 is detachably attached to the standing unit mounting hole 312. The standing unit 306, the treatment instrument standing table 36, and the operating wire 38 constitute the treatment instrument standing mechanism of the present invention. The standing unit 306, the treatment instrument standing table 36, and the operating wire 38 are disposable (replaceable) items that are removed from the tip section main body 304 and discarded after use of the ultrasonic endoscope 300 is completed.

[0099] The erector unit 306 has an opening 320, a base end wall portion 321, a first wall portion 322, a second wall portion 323, a bottom wall portion 324, and a rotation shaft 325. The base end wall portion 321, the first wall portion 322, the second wall portion 323, and the bottom wall portion 324 form an erector housing space 318.

[0100] When the erector unit 306 (tip end body 304) is viewed from the Z(+) direction side, the opening 320 exposes the erector housing space 318. This allows the treatment tool to be led out of the erector housing space 318 in the Z(+) direction.

[0101] The base end wall portion 321 defines the Y(-) direction side of the elevator housing space 318, and has a treatment tool outlet 328 and a wire insertion hole 329 opening therein.

[0102] When the standing unit 306 is attached to the standing unit mounting hole 312, the treatment tool outlet 328 is connected to the treatment tool channel 37 via the treatment tool insertion port 314. This allows the treatment tool to be led out from the treatment tool outlet 328 through the erector housing space 318 (treatment tool erector 36). Furthermore, when the standing unit 306 is attached to the standing unit mounting hole 312, the wire insertion hole 329 is connected to the wire channel 40 via the wire insertion hole 315. This allows the operation wire 38 to be inserted from the wire insertion hole 329 through the wire insertion hole 315 into the wire channel 40.

[0103] The first wall portion 322 is provided on the distal end surface side of the base end wall portion 321 at a position on the X(-) direction side with respect to the treatment tool outlet 328, and has a shape that extends in the Y(+) direction. This first wall portion 322 defines the X(-) direction side of the elevator housing space 318.

[0104] The second wall portion 323 is provided on the distal end surface side of the proximal wall portion 321 at a position on the X(+) direction side with respect to the treatment tool outlet 328, and has a shape that extends in the Y(+) direction. This second wall portion 323 defines the X(+) direction side of the erector housing space 318. As a result, the width of the erector housing space 318 in the X direction is defined by the first wall portion 322 and the second wall portion 323. Furthermore, on the side of the second wall portion 323 facing the first wall portion 322, i.e., on the surface on the X(-) direction side, a first wall surface 100, a second wall surface 102, and a step surface 104 are formed, which are similar to those in the above embodiment (see FIG. 7).

[0105] When the erection unit 306 is viewed from the Z(-) direction side, the bottom wall portion 324 is provided between the Z(-) direction end portions of the first wall portion 322 and the second wall portion 323 so as to cover the erection platform accommodating space 318. This bottom wall portion 324 defines the Z(-) direction side of the erection platform accommodating space 318.

[0106] The rotating shaft 325 is basically the same as the rotating shaft 88 of the above embodiment, and has one end attached to the first wall portion 322 and the other end attached to the second wall portion 323. This rotating shaft 325 holds the treatment instrument stand 36 rotatably between a laid-down position and an erected position (see FIG. 12).

[0107] Figure 18 is a cross-sectional view taken along line XVIII-XVIII in Figure 17. Note that Figure 18 simply illustrates the treatment tool elevator 36. As shown in Figure 18, the treatment tool elevator 36 includes the above-mentioned elevator main body 90, elevator tip 92, and wire connection portion 94.

[0108] When the insertion section distal end 302 (standing unit 306) is viewed from the Z(+) direction, the second wall surface 102 overlaps with at least a part of the wire connecting section 94 (wire distal end 38a, see FIG. 9) in the X direction. Therefore, similar to the above embodiment, the second wall surface 102 prevents the distal end of the treatment tool from slipping into the gap on the Z(-) direction side of the wire distal end 38a.

[0109] As in the above embodiment, the step surface 104, together with the second wall surface 102, prevents the treatment tool tip 38a from slipping into the gap on the Z(-) direction side of the wire tip 38a. The step surface 104 also functions as a guide surface for the wire tip 38a when the treatment tool stand 36 rotates between the laid-down position and the erected position.

[0110] As described above, by forming the second wall surface 102 and the stepped surface 104 on the second wall portion 323 of the standing unit 306, it is possible to prevent the distal end of a treatment tool from slipping into a position on the Z(-) direction side of the wire distal end 38a. Furthermore, by providing the second wall portion 323 (the second wall surface 102 and the stepped surface 104) on the disposable standing unit 306, it is not necessary to provide a configuration equivalent to the second wall portion 323 on the distal end body 304, which prevents the accessibility of a cleaning brush to the distal end body 304 from being impaired after the standing unit 306 is removed. Furthermore, even if the stepped surface 104 wears due to sliding with the wire distal end 38a, this does not pose a problem because the standing unit 306 is discarded after each use of the ultrasonic endoscope 300. As a result, it is possible to improve the accessibility of the cleaning brush, prevent wear on the distal end body 304, and prevent the treatment tool from slipping into the Z(-) direction side of the operating wire 38. [Explanation of symbols]

[0111] 10 Endoscopy 12 Endoscopy System 14. Endoscope processor device 15 Light source device 15A processor side connector 16 Image processing device 18 Display 20 Standing operation lever 22 Control section 24 Insertion section 26 Soft part 28 Curved section 30 Insertion tip 32 Tip body 34 Cap 36 Treatment Instrument Stand 36a Treatment tool guide surface 37 Treatment tool channel 38 Control wire 38a Wire tip 40 wire channel 42 Air and water supply tube 44 Cable Pass-Through Channel 46 Operation unit body 48 Gripping part 50 Anti-break pipe 52 Universal Cable 54 Connector device 57 Air and water supply button 58 Air and water supply nozzle 59 Suction button 60 Treatment tool outlet 61 Wire insertion hole 62 Angle knob 64 Treatment tool introduction port 65 Proximal wall 66 Standing platform storage space 68 1st wall 74 Lighting window 76 Observation window 80 First Opening Window 82 Cap tip 82a Second opening window 84 Standing platform holding part 86 2nd wall section 88 Rotational Axis 90 Standing platform main body 90a Insertion hole 92 Tip of standing stand 94 Wire Connection 96 Wire attachment part 100 First wall 102 Second wall 104 Step surface 200 First Mold 202 Second mold 204 Through hole 210 First Mold 210a mold surface 212 Second mold 300 Ultrasound Endoscope 302 Insertion tip 304 Tip body 304a Transducer mounting part 304b Body base 306 Standing Unit 308 Ultrasonic Transducer 310 Slope 312 Standing unit mounting hole 314 Treatment tool insertion port 315 Wire insertion hole 318 Standing platform storage space 320 Opening 321 Proximal wall 322 1st wall section 323 2nd wall section 324 Bottom 325 Rotational Axis 328 Treatment tool outlet 329 Wire insertion hole Ax long axis direction CA center axis

Claims

1. an operating unit provided with an operating member; an insertion section that is provided at a distal end of the operation section and is inserted into a subject; a tip portion main body located at the tip of the insertion portion; a stand-up storage space forming member that is detachably attached to the tip portion main body and forms a stand-up storage space; a base end wall portion provided on the distal end portion main body or the stand accommodating space forming member, the base end wall portion having an outlet opening for a treatment tool; a first wall portion extending from the base end wall portion toward the distal end of the distal end body and provided at a position on one side of the outlet in a first direction perpendicular to the longitudinal axis of the distal end body; a second wall portion provided on the stand accommodating space forming member, which forms the stand accommodating space together with the base end wall portion and the first wall portion, and which faces the first wall portion at a position on the other side of the outlet port opposite to the one side; a treatment tool stand that is disposed in the stand accommodating space and is rotatable between a lying position and an upright position around a rotation axis parallel to the first direction, the treatment tool stand having a stand main body that is rotatably held on the rotation axis, a stand tip end portion provided at the tip side of the stand main body, and a wire connection portion that is provided so as to protrude from the stand tip end portion in the other direction; an operation wire connected to the wire connection portion and configured to rotate the treatment instrument stand; Equipped with When viewed from a second direction perpendicular to both the longitudinal axis and the first direction, the wire connection portion and a wire tip end of the operation wire connected to the wire connection portion are located on the other direction side of the elevator main body, the second wall portion has a first wall surface, at least a portion of which has a shape that follows the trajectory of the wire connection portion that rotates around the rotation axis and is adjacent to the wire connection portion in the first direction, and a second wall surface that is provided at a position on the one direction side of the first wall surface and has a shape that follows the trajectory of the elevator main body that rotates around the rotation axis, When viewed from the second direction, the second wall surface overlaps with at least a portion of the wire tip end in the first direction, the second wall portion has a step surface formed between the first wall surface and the second wall surface, the stepped surface has a shape that follows the trajectories of the wire connecting portion and the wire tip end that rotate around the rotation axis, An endoscope in which the step surface is close to the wire connection portion to which the wire tip is connected to a position that prevents the treatment tool from slipping into the gap between the step surface and the wire connection portion to which the wire tip is connected.

2. The endoscope according to claim 1 , wherein the wire tip portion has a shape that protrudes from the elevator tip portion toward the other direction beyond the elevator main body portion.

3. The endoscope according to claim 1 or 2, wherein the second wall surface is provided at a position on the one direction side of a central axis of the wire tip portion when viewed from the second direction.

4. The endoscope according to claim 1 , wherein the step surface is formed in an arc shape when viewed from the first direction.

5. The endoscope according to claim 1 , wherein the first wall surface is provided on the other side of the operating wire when viewed from the second direction.

6. the distal end body has the proximal end wall and the first wall, The endoscope according to claim 1 , wherein the elevator accommodating space forming member is a cap having the second wall portion.

7. 7. The endoscope according to claim 6, wherein an opening window is formed in the distal end portion of the cap to expose the elevator housing space when viewed from the distal end side of the cap.

8. the stand accommodating space forming member has the base end wall portion, the first wall portion, and the second wall portion, The endoscope according to claim 1 , further comprising an ultrasonic transducer provided on the distal end side of the distal end body.

9. The endoscope according to any one of claims 1 to 8, further comprising an insert molding in which the treatment instrument stand and the operation wire are integrated.

10. The endoscope according to any one of claims 1 to 8, wherein the treatment instrument stand and the operation wire are formed as separate bodies.

11. an operating unit provided with an operating member; an insertion section that is provided at a distal end of the operation section and is inserted into a subject; a tip portion main body located at the tip of the insertion portion; A treatment tool raising mechanism attached to the distal end body of an endoscope and changing the direction in which a treatment tool is introduced, a stand-up storage space forming member that is detachably attached to the tip portion main body and forms a stand-up storage space; a base end wall portion provided on the distal end portion main body or the erector accommodating space forming member, the base end wall portion having an opening for the treatment tool outlet; a first wall portion extending from the base end wall portion toward the distal end of the distal end body and provided at a position on one side of the outlet in a first direction perpendicular to the longitudinal axis of the distal end body; a second wall portion provided on the stand accommodating space forming member, which forms the stand accommodating space together with the base end wall portion and the first wall portion, and which faces the first wall portion at a position on the other side of the outlet port opposite to the one side; a treatment tool stand that is disposed in the stand accommodating space and is rotatable between a lying position and an upright position around a rotation axis parallel to the first direction, the treatment tool stand having a stand main body that is rotatably held on the rotation axis, a stand tip end portion provided at the tip side of the stand main body, and a wire connection portion that is provided so as to protrude from the stand tip end portion in the other direction; an operation wire connected to the wire connection portion and configured to rotate the treatment instrument stand; Equipped with When viewed from a second direction perpendicular to both the longitudinal axis and the first direction, the wire connection portion and a wire tip end of the operation wire connected to the wire connection portion are located on the other direction side of the elevator main body, the second wall portion has a first wall surface, at least a portion of which has a shape that follows the trajectory of the wire connection portion that rotates around the rotation axis and is adjacent to the wire connection portion in the first direction, and a second wall surface that is provided at a position on the one direction side of the first wall surface and has a shape that follows the trajectory of the elevator main body that rotates around the rotation axis, When viewed from the second direction, the second wall surface overlaps with at least a portion of the wire tip end in the first direction, the second wall portion has a step surface formed between the first wall surface and the second wall surface, the stepped surface has a shape that follows the trajectories of the wire connecting portion and the wire tip end that rotate around the rotation axis, A treatment tool raising mechanism in which the step surface approaches the wire connection portion to which the wire tip is connected to a position that prevents the treatment tool from slipping into the gap between the step surface and the wire connection portion to which the wire tip is connected.

12. The treatment tool erecting mechanism according to claim 11, wherein the second wall surface is provided at a position on the one side of a central axis of the wire distal end portion when viewed from the second direction.

Images