Ultrasonic endoscope

Abstract

Provided is an endoscope capable of inhibiting deterioration of a distal end portion main body over time due to clamping of a treatment instrument. The endoscope includes a distal end portion main body provided at a distal end of an insertion portion, the distal end portion main body having a stand housing space forming wall that forms a stand housing space that opens in a direction perpendicular to a length axis direction of the insertion portion, a lead-out portion having a treatment instrument lead-out port that opens toward the inside of the stand housing space, and a stand disposed inside the stand housing space so as to be rotatable about a rotation axis between a standing position and a lying position, and having a guide surface that guides the treatment instrument, the stand housing space forming wall having an opening wall portion on the opening side of the stand housing space, and in the opening wall portion, an opposing wall portion that opposes the guide surface when the stand is in the standing position is formed of a material that is harder than other wall portions excluding the opposing wall portion.

Description

Technical Field

[0001] The present invention relates to an endoscope, and more particularly to an endoscope including an erection stand for erecting a treatment instrument introduced from an opening. Background Art

[0002] Conventionally, there is known a technique in which an endoscope is provided with a standing platform and a standing platform storage space at the front end body of an insertion portion inserted into a body cavity, wherein a treatment instrument inserted through a treatment instrument insertion channel and guided out from an opening of the standing platform storage space is stood up by the standing platform, and the guiding direction of the treatment instrument is adjusted by changing the standing angle of the standing platform.

[0003] For example, Patent Document 1 describes an endoscope with a protrusion on the fixing sleeve that secures the connecting tube and the treatment instrument insertion hose, allowing smooth advancement of treatment instruments from the treatment instrument insertion hose toward the connecting tube at an elevated angle. Patent Document 2 describes an endoscope with a second guide groove, smaller than the opening width of the treatment instrument insertion hole, formed on the inner surface of the treatment instrument insertion hole to suppress the shaking of treatment instruments with different cross-sectional diameters. Furthermore, Patent Document 3 describes an ultrasonic endoscope with a notch formed in the front wall of a recessed portion of a lifting platform for accommodating flexible linear treatment instruments, thereby increasing the degree of freedom in the protruding direction of the flexible linear treatment instrument.

[0004] Patent Document 1: Japanese Patent Publication No. 2017-086399

[0005] Patent Document 2: International Publication No. 2018 / 079790

[0006] Patent Document 3: Japanese Patent No. 6223723

[0007] Endoscopes are used in conjunction with various treatment instruments, including puncture needles, guidewires, and stents. For example, a cyst is punctured with a needle, and a guidewire is passed through it, where a stent is placed, using the guidewire as a guide to expel the contents of the cyst into the digestive tract. This treatment is becoming increasingly common.

[0008] However, when removing the treatment instrument (puncture needle) using the guidewire as a guide, the guidewire can also move along with the needle, sometimes causing it to become dislodged from the cyst. This dislodgment makes it impossible to place the stent at the desired location using the guidewire after needle removal. Furthermore, resetting the guidewire can significantly lengthen the procedure.

[0009] Furthermore, the guidewire is clamped between the upright stand and the distal end body, increasing the guidewire's sliding resistance and preventing it from slipping out of the puncture site. Endoscopes have a cable connected to the observation optical system within the distal end body, and ultrasonic endoscopes are equipped with an ultrasonic transducer in the distal end, which is driven by a high voltage of approximately 50V. Therefore, for electrical safety reasons, the distal end body is typically constructed of a resin component.

[0010] On the other hand, treatment instruments, such as those made of metal tubes such as stainless steel, require a high erection force to erect them using an erection base with high bending rigidity. A greater erection force (the force used to bend the puncture needle by the erection base) increases the puncture angle of the needle, allowing for a wider range of punctures. However, increasing the erection force can damage the needle by pressing against the resin portion of the tip facing the erection base. Summary of the Invention

[0011] The present invention has been made in view of such circumstances, and an object thereof is to provide an endoscope capable of preventing grinding of a distal end portion body caused by treatment instruments such as a puncture needle and a guide wire and suppressing deterioration over time.

[0012] In order to achieve the purpose of the present invention, the endoscope involved in the present invention comprises a front end body arranged at the front end of an insertion part extending in the longitudinal axis direction, the front end body comprising: a standing platform accommodating space forming wall, forming a standing platform accommodating space opening in a direction perpendicular to the longitudinal axis direction; an outlet portion having a treatment instrument outlet, the treatment instrument outlet constituting the front end of a treatment instrument insertion channel inserted through and arranged inside the insertion portion and opening toward the inside of the standing platform accommodating space; and a standing platform, which is arranged in the standing platform accommodating space to be rotatable around a rotation axis between an upright position and a lying position, and has a guide surface for guiding the treatment instrument guided out of the treatment instrument outlet, the standing platform accommodating space forming wall having an opening wall portion on the opening side of the standing platform accommodating space, and in the opening wall portion, an opposing wall portion opposing the guide surface when the standing platform is in the upright position is made of a harder material than other wall portions except the opposing wall portion.

[0013] Effects of the Invention

[0014] According to the endoscope of the present invention, in the opening wall portion forming the wall of the upright platform accommodating space, the opposing wall portion opposite to the guide surface of the upright platform is made of a material harder than other wall portions other than the opposing wall portion. As a result, even if the upright platform and the opposing wall portion are used to clamp the treatment instrument, the front end body can be prevented from being worn and the deterioration of the endoscope over time can be suppressed. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is an overall view of the ultrasonic endoscope of the present invention.

[0016] Figure 2 This is a perspective view showing the appearance of the front end portion of the standing platform in the fallen state.

[0017] Figure 3 This is a perspective view showing the appearance of the front end portion of the standing platform in the standing state.

[0018] Figure 4 It is a side sectional view of the front end.

[0019] Figure 5 The stand is in the down position. Figure 4 Figure viewed from the C direction.

[0020] Figure 6 When the stand is in the standing position, Figure 4 Figure viewed from the D direction.

[0021] Figure 7 It is a side sectional view showing a state where the guide wire is fixed.

[0022] Figure 8 It is a side sectional view showing the structure of the front end portion of a modification of the first embodiment.

[0023] Figure 9 It is a side sectional view showing the structure of the front end portion of the second embodiment.

[0024] Explanation of symbols

[0025] 1-Endoscope, 10-Operating portion, 12-Insertion portion, 14-Universal cord, 16-Angled button, 18-Upright operating lever, 20-Air and water supply button, 22-Suction button, 24-Disposal instrument introduction port, 30-Soft portion, 32-Bendable portion, 34, 134, 234-Front end portion, 36, 136, 236-Front end portion body, 37-Main body shell, 38-Long axis of insertion portion, 40-Base, 42-Extension portion, 44-Observation window, 46A-First lighting window, 46B-Second lighting window, 48-Air and water supply nozzle, 50-Ultrasonic sensor, 52-Ultrasonic transmitting and receiving surface, 58-Opening, 60- Standing table, 60a-guide surface, 62-standing table accommodating space, 63-standing unit, 64-standing table accommodating space forming wall, 66, 166, 266-opening wall portion, 66A, 166A, 266A-opposing wall portion, 68, 168-convex portion, 70, 170, 270-other wall portions, 72a-observation mechanism forming surface, 72b, 72c-illumination mechanism forming surface, 72d-nozzle forming surface, 80-disposal instrument lead-out port, 82-disposal instrument insertion channel, 84-lead-out portion, 86-lead-out port forming wall, 88-puncture needle, 90-guide wire, 92-rotating axis, 94-first surface, 96-second surface. DETAILED DESCRIPTION

[0026] Hereinafter, the endoscope according to the present invention will be described with reference to the accompanying drawings.

[0027] (Endoscope)

[0028] Figure 1 This is an overall view of an endoscope 1 to which the present invention is applied. While the following embodiments are described using an ultrasonic endoscope as an example, the present invention is also applicable to endoscopes other than ultrasonic endoscopes. Specifically, any endoscope having an opening for introducing a stand and a treatment instrument is applicable to the present invention.

[0029] Figure 1 The endoscope 1 in the figure comprises an operation portion 10 which is grasped by an operator to perform various operations, an insertion portion 12 which is inserted into a patient's body cavity, and a universal cord 14. The endoscope 1 is connected to system components such as a processor device and a light source device (not shown) constituting the endoscope system via the universal cord 14.

[0030] The operation portion 10 is provided with various operation members operated by the operator, such as an angle button 16 , a rising operation lever 18 , an air and water supply button 20 , and a suction button 22 .

[0031] Furthermore, the operation portion 10 is provided with a treatment instrument introduction port 24 for inserting a treatment instrument into a treatment instrument insertion channel inserted through the insertion portion 12 .

[0032] The insertion portion 12 extends from the front end of the operation portion 10 and is formed in an elongated shape with a narrow diameter as a whole.

[0033] The insertion portion 12 is composed of a soft portion 30 , a bending portion 32 , and a distal end portion 34 in this order from the proximal end side toward the distal end side.

[0034] The soft portion 30 occupies most of the base end of the insertion portion 12 and has flexibility to bend in any direction. When the insertion portion 12 is inserted into the body cavity, the soft portion 30 bends along the insertion path into the body cavity.

[0035] The bending portion 32 is bent in the vertical and horizontal directions by rotating the angle knob 16 of the operation portion 10 . By bending the bending portion 32 , the distal end portion 34 can be directed in a desired direction.

[0036] The front end portion 34 has a reference Figures 2 to 4 The distal end body 36 , which will be described in detail later, is provided with an ultrasonic sensor 50 having a plurality of ultrasonic transducers at its distal end side.

[0037] Figure 1 The universal cord 14 shown internally contains an electrical cable, a light guide, and a fluid hose. A connector is provided at the end of the universal cord 14 (not shown). By connecting this connector to predetermined system components of the endoscope system, such as a processor device and a light source device, the system components supply the endoscope 1 with power, control signals, illumination light, liquids, and gases required for operating the endoscope 1. Furthermore, observation image data acquired by the imaging unit and ultrasonic image data acquired by the ultrasonic sensor are transmitted from the endoscope 1 to the system components. Furthermore, the observation images and ultrasonic images transmitted to the system components are displayed on a monitor, allowing the operator and others to observe them.

[0038] <First Implementation>

[0039] (Structure of the front end)

[0040] Next, the structure of the distal end portion 34 of the insertion portion 12 of the endoscope according to the first embodiment will be described. Figure 2 It is a perspective view showing the appearance of the front end portion 34 and is a view showing a state in which the standing base 60 is in the lying position. Figure 3 It is a perspective view showing the appearance of the front end portion 34 , and is a view showing a state in which the standing base 60 is located at the standing position. Figure 4 It is a side sectional view.

[0041] The front end portion 34 includes a front end portion body 36 forming an outer wall and an inner partition wall thereof. Each component arranged in the front end portion body 36 is accommodated and held in a housing portion provided in the front end portion body 36 .

[0042] Although detailed description is omitted, the front end portion body 36 can be partially detachably removed as a separate block, and with the separate block removed, the various components can be assembled into a predetermined receiving portion. After the various components are assembled into the receiving portion, the separate block is attached to the front end portion body 36, thereby receiving and retaining the various components in the receiving portion and fixing them to the front end portion 34.

[0043] The distal end portion body 36 is formed of an insulating material having insulating properties, for example, a resin material such as methacrylic resin, polyphenylene sulfone resin, polyetherimide resin, polyetheretherketone resin, or plastic such as polycarbonate.

[0044] like Figures 2 to 4 As shown, the distal end body 36 is composed of a base 40 that constitutes an observation optical system, a guide portion, and a stand for guiding the treatment instrument guided out from the guide portion; and an extension portion 42 that extends from the base 40 toward the distal end and stores the ultrasonic sensor 50.

[0045] A convex ultrasonic sensor 50 for transmitting and receiving ultrasonic waves is disposed in the extension portion 42. The ultrasonic sensor 50 has an ultrasonic wave transmitting and receiving surface 52 formed so that ultrasonic transducers are arranged in a curved shape along the longitudinal axis 38 of the insertion portion 12. The ultrasonic sensor 50 acquires data for generating ultrasonic images of in vivo tissues.

[0046] like Figure 2 and Figure 3 As shown, the distal end body 36 is provided with an observation window 44 , a first lighting window 46A, a second lighting window 46B, an air and water supply nozzle 48 , and an opening 58 for leading out a treatment tool.

[0047] An opening 58 is provided in the base 40 of the distal end body 36, and a treatment instrument is guided through the opening 58 into the ultrasonic scanning range of the ultrasonic sensor 50. The stand accommodating space 62 is a space defined by a stand accommodating space forming wall 64, and the opening 58 is formed to open in a direction perpendicular to the longitudinal axis 38 of the insertion portion 12 of the stand accommodating space 62.

[0048] like Figure 2 and Figure 4 As shown, a lead-out portion 84 having a treatment instrument lead-out port 80 opening toward the interior of the stand accommodating space 62 is disposed on the proximal end side of the stand accommodating space 62. The treatment instrument lead-out port 80 is connected to the treatment instrument insertion channel 82 disposed in the insertion portion 12 and the treatment instrument introduction port 24 of the operation portion 10 (see FIG. Figure 1 ) is connected. Thus, when the endoscope is inserted into the body cavity and treatment or observation is performed, the treatment instrument inserted from the treatment instrument introduction port 24 is discharged from the treatment instrument outlet 80 (reference Figure 4) is exported to the standing table accommodating space 62.

[0049] The standing platform 60 is positioned forward of the treatment instrument outlet 80, which serves as the standing platform storage space 62. The standing platform 60 is configured to rotate freely about a rotation axis 92 between an upright position and a collapsed position. The standing platform 60 is formed of a metal material such as stainless steel and has a concave guide surface 60a on its upper surface that curves upward from the base end toward the distal end of the distal end body 36. Treatment instruments exiting the treatment instrument outlet 80 are directed upward along this guide surface 60a relative to the longitudinal axis of the insertion portion 12 and are then discharged to the outside through the upper opening 58 of the standing platform storage space 62.

[0050] Furthermore, the stand 60 is Figure 1 The operation of the raising lever 18 is to rotate about the rotation axis 92 to raise the raising platform 60. By raising the raising platform 60 and adjusting the raising angle from the fallen state, the direction (leading-out angle) of the treatment instrument led out from the opening 58 can be changed.

[0051] The front end portion body 36 has an erection unit 63, and the erection base 60 is disposed in the erection unit 63. The erection unit 63 is formed of, for example, a metal material having corrosion resistance.

[0052] in addition, Figure 4 The treatment instrument insertion channel 82 shown is also connected to a suction channel not shown, and is operated Figure 1 The suction button 22 can also suck body fluids etc. from the opening 58.

[0053] An observation window 44 is provided on an observation mechanism-forming surface 72a located at the base end of the upright stage storage space 62. An imaging system unit, comprising an imaging optical system and a solid-state imaging element, is housed within the observation window 44. Thus, when light from the treatment area, which forms the imaging area's field of view, is captured through the observation window 44, it is imaged as an observation image on the solid-state imaging element via the imaging optical system. In other words, the treatment area is imaged by the solid-state imaging element.

[0054] The first and second illumination windows 46A, 46B are provided on the illumination mechanism-forming surfaces 72b, 72c. A light emitting portion constituting the illumination unit is housed within the first and second illumination windows 46A, 46B. Illumination light, transmitted from a light source connected to the universal cord 14 via a light guide, is emitted from the light emitting portion. This illumination light is then transmitted through the first and second illumination windows 46A, 46B to illuminate the treatment area within the imaging unit's field of view.

[0055] The air and water supply nozzles 48 are provided on the nozzle forming surface 72d. Figure 1 Operation of the air and water supply button 20, from Figure 2 and Figure 3 The air and water supply nozzle 48 sprays cleaning liquid, water, air, etc. toward the observation window 44 to clean the observation window 44.

[0056] Next, the positional relationship between the opening 58, the stand accommodating space 62, and the observation window 44 will be described. Figure 2 As shown, with the position of the opening 58 as the reference position, the observation window 44 is positioned opposite the upright platform storage space 62 in the direction indicated by arrow A (the direction of the opening of the opening 58). Specifically, when the distal end body 36 is projected onto an imaginary plane perpendicular to the longitudinal axis 38, the observation window 44 is positioned on the opening side of the upright platform storage space 62 (the side of the opening 58). Positioning the observation window 44 above the opening 58 allows the treatment instrument to enter the observation field of view of the observation window 44 when it is being guided out of the opening 58. This allows the treatment instrument to be guided to the target location, improving the effectiveness of the treatment instrument in reaching the target location.

[0057] The space between the observation window 44 and the stand accommodating space 62 is Figure 2 The position in the direction indicated by arrow B is preferably such that the observation window 44 is offset from the standing table storage space 62 in the direction indicated by arrow B. The observation window 44 being offset from the standing table storage space 62 in the direction indicated by arrow B means that the center line of the observation window 44 is offset from the center line of the standing table 60 in the direction indicated by arrow B. This configuration prevents the observation field of the observation window 44 from being blocked by the treatment instrument and the standing table 60 even when the standing table 60 is upright and the treatment instrument is guided out of the opening 58, thereby enabling reliable confirmation of the treatment position through the observation window 44.

[0058] The front end portion body 36 is formed by assembling a metal erecting unit 63 to a resin main body case 37. The erecting platform storage space 62 is formed by an erecting platform storage space forming wall 64. A portion of the erecting platform storage space forming wall 64 is formed by the erecting unit 63, and the other portion is formed by the main body case 37.

[0059] The stand accommodating space forming wall 64 has an opening wall portion 66 on the side of the opening portion 58. Figure 4 The upright stand 60, shown by the two-dot chain line, has an opposing wall portion 66A that opposes the guide surface 60a of the upright stand 60 when in the upright position. The opposing wall portion 66A is a component of the upright unit 63. Specifically, the opposing wall portion 66A is made of metal. Furthermore, the wall portion 70 of the opening wall portion 66, excluding the opposing wall portion 66A, is a component of the main body housing 37 and is made of resin.

[0060] That is, in this embodiment, the opposing wall portion 66A is formed of metal, and the other wall portions 70 are formed of resin, and the opposing wall portion 66A is made of a harder material than the other wall portions 70. The "other wall portions" refer to the wall portion provided closer to the front end side than the upright stand 60 in the opening wall portion 66 forming the opening 58, and the wall portions on both side surfaces of the upright stand 60.

[0061] The rising unit 63 is provided with a treatment instrument outlet 80 connected to the distal end of the treatment instrument insertion channel 82. Furthermore, the treatment instrument outlet 80 is formed by an outlet-forming wall 86. In other words, the treatment instrument outlet 80 and the outlet-forming wall 86 are formed by the rising unit 63. The opposing wall portion 66A is integrally formed with the outlet-forming wall 86 and is made of the same material.

[0062] Furthermore, the opposing wall portion 66A includes a convex portion 68 that protrudes toward the distal end in the direction of the longitudinal axis 38. The convex portion 68 is formed to have a convex shape that corresponds to the concave guide surface 60a of the standing platform 60. By aligning the convex shape of the convex portion 68 with the concave shape of the guide surface 60a, when the standing platform 60 is in the standing position, a guide wire can be sandwiched between the guide surface 60a and the convex portion 68 to secure it (lock the guide wire).

[0063] Figures 5 to 7 This is a diagram showing a treatment instrument being held by the opposing wall portion 66A and the stand 60. Figure 5 The stand 60 is in the state of being in the down position. Figure 4 Figure viewed from the C direction. Figure 6 The stand 60 is in the standing position. Figure 4 Figure viewed from the D direction. Figure 7 It is a side cross-sectional view showing a state where the guide wire 90 is fixed by the rising base 60 and the facing wall portion 66A.

[0064] like Figure 5 As shown, the convex portion 68 formed on the opposing wall portion 66A has a first surface 94 on the side of the stand accommodating space 62. The first surface 94 is formed in a concave shape with respect to the guide surface 60a of the stand 60 so as to be away from each other. Figure 5 The treatment instrument with a thicker diameter of the puncture needle 88 indicated by the double-dashed line can be held between the two surfaces (the first surface 94 and the guide surface 60a) that are formed to be concave in a manner away from each other. Figure 5 The horizontal Figure 2 There will be no positional deviation in the B direction), so the disposal instrument can be stably held.

[0065] And, as Figure 6 and Figure 7 As shown, in Figure 5 In the further upright state, the shape of the convex portion 68 is formed into a convex shape along the shape of the concave guide surface 60a, and the second surface 96 including the top of the convex portion 68 is brought close to the guide surface 60a, thereby being able to maintain the same Figure 6 The guide wire 90 shown by the double dotted line is a treatment instrument with a relatively thin diameter. The second surface 96 becomes the contact surface with the treatment instrument. Figure 7 As shown, the guide wire 90 has a small diameter and low bending rigidity. Therefore, even if it is clamped by the upright stand 60 and the protrusion 68, the guide wire 90 will not bend and fall out of the insertion point of the puncture needle, thereby ensuring that the guide wire 90 is fixed.

[0066] In this manner, the guide wire 90 is held and secured by being clamped between the guide surface 60a of the upright platform 60 and the protrusion 68 of the opposing wall 66A. The opposing wall 66A is made of a harder material than the other wall portions 70 of the opening wall 66, excluding the opposing wall 66A. This prevents grinding of the opposing wall 66A due to the uprighting force of the upright platform 60, even when a treatment instrument is clamped between the guide surface 60a, the protrusion 68, and the opposing wall 66A. Furthermore, the provision of the protrusion 68 allows the guide wire to be secured by being clamped between the guide surface 60a and the protrusion 68. Furthermore, the opposing wall 66A can be made of ceramics, in addition to metal.

[0067] Furthermore, when the stand 60 is in the upright position, the width of the gap between the guide surface 60a and the top end of the protrusion 68 is preferably set to 0.5 mm or less. Since the diameter of a conventional guide wire is 0.6 mm, by setting the gap to 0.5 mm or less, the guide wire can be clamped between the protrusion 68 and the guide surface 60a.

[0068] As described above, according to this embodiment, in the opening wall portion 66 on the opening side of the stand-up accommodating space-forming wall 64 that forms the stand-up accommodating space 62, the opposing wall portion 66A, which faces the guide surface 60a when the stand 60 is in the upright position, is made of a harder material than the other wall portions 70 other than the opposing wall portion 66A. This prevents grinding of the opposing wall portion when a treatment instrument is clamped between the guide surface 60a and the opposing wall portion 66A. Furthermore, by using a harder material, grinding of the opposing wall portion can be prevented even when the treatment instrument is clamped with a large upright force. Furthermore, by providing the protrusion 68, the guide wire can be secured by being clamped between the guide surface 60a and the protrusion 68.

[0069] Modification

[0070] Figure 8 It is a side sectional view showing the structure of the front end portion of a modification of the first embodiment. Figures 2 to 4The facing wall portion 66A of the illustrated front end portion 34 is formed as a part of the constituent element of the rising unit 63 and is formed integrally with the outlet forming wall 86 .

[0071] In contrast, Figure 8 The distal end portion 134 shown has an opposing wall portion 166A, including the convex portion 168 of the opening wall portion 166, formed separately from the rising unit 63 and made of a harder material than the other wall portions 170. Thus, even if only the opposing wall portion 166A is formed of a harder material, the portion pressed by the rising base 60 when the guidewire is secured is the opposing wall portion 166A, thereby preventing wear of the opposing wall portion 166A and degradation of the distal end portion body 136. Furthermore, unlike the rising unit 63, the material of the opposing wall portion 166A can be changed to a harder material.

[0072] Second Implementation Method

[0073] Figure 9 This is a side cross-sectional view showing the structure of the distal end portion 234 of the endoscope according to the second embodiment. The distal end portion 234 of the second embodiment differs from the distal end portion 34 of the endoscope according to the first embodiment in that it does not have a convex portion on the opposing wall portion 266A of the opening wall portion 266. In the second embodiment as well, the opposing wall portion 266A is made of a harder material than the other wall portions 270.

[0074] Even without the protrusion, a treatment instrument with a relatively large diameter can be clamped by the opposing wall 266A and the upright stand 60. In this case, by making the opposing wall 266A of a relatively hard material, even if the treatment instrument is pressed against the opposing wall 266A by the upright stand 60, grinding of the opposing wall 266A can be prevented. Consequently, deterioration of the distal end body 236 over time can be prevented.

[0075] Furthermore, although the convex type ultrasonic sensor has been described above, the present invention is not limited to the convex type ultrasonic sensor, and is also applicable to a radial type ultrasonic sensor.

Claims

1. An ultrasonic endoscope comprising a distal end body provided at a distal end of an insertion portion extending in a longitudinal axis direction, the distal end body comprising an ultrasonic sensor having an ultrasonic transducer and formed of a resin, wherein: The front end body has: The standing platform accommodating space forms a wall, forming the standing platform accommodating space open in a direction perpendicular to the longitudinal axis direction; The lead-out portion includes a treatment instrument lead-out port, the treatment instrument lead-out port constituting a front end of a treatment instrument insertion passage that is inserted through and disposed within the insertion portion and opening toward the interior of the standing platform accommodation space; and The upright stand is provided in the upright stand storage space so as to be rotatable about a rotation axis between an upright position and a lying position, and the upright stand is arranged closer to the base end side of the ultrasonic sensor in the longitudinal axis direction and has a guide surface for guiding the treatment instrument led out of the treatment instrument lead-out port. The standing platform storage space forming wall has an opening wall portion on the opening side of the standing platform storage space. In the opening wall portion, the opposing wall portion that faces the guide surface when the rising base is located at the rising position is formed of a material harder than all other wall portions formed of the resin except the opposing wall portion.

2. The ultrasonic endoscope according to claim 1, wherein The material of the opposing wall portion is metal.

3. The ultrasonic endoscope according to claim 1, wherein: The material of the opposing wall portion is ceramic.

4. The ultrasonic endoscope according to claim 2, wherein: The other wall parts are made of resin.

5. The ultrasonic endoscope according to claim 3, wherein: The other wall parts are made of resin.

6. The ultrasonic endoscope according to any one of claims 1 to 5, wherein: The opposing wall portion is integrally formed of the same material as a lead-out port forming wall forming the treatment instrument lead-out port.

7. The ultrasonic endoscope according to any one of claims 1 to 5, wherein: The opposing wall portion includes a contact surface on which a treatment instrument led out from the treatment instrument lead-out port contacts when the standing base is located at the standing position.

8. The ultrasonic endoscope according to claim 7, wherein: The opposing wall portion has a convex portion protruding toward the front end side in the longitudinal axis direction. The abutting surface is formed of a surface including the top of the convex portion.

9. The ultrasonic endoscope according to claim 8, wherein: The standing platform has a concave guide surface for guiding the treatment instrument led out from the treatment instrument lead-out port. The convex portion has a convex shape corresponding to the concave shape of the guide surface.

10. The ultrasonic endoscope according to claim 9, wherein: When the standing base is located at the standing position, a gap between the guide surface and the convex portion is 0.5 mm or less.

Images