阅读说明：本技术 内窥镜 (Endoscope with a detachable handle ) 是由 森本康彦 冈田知 福泽常夫 于 2020-02-19 设计创作，主要内容包括：本发明提供一种能够抑制因夹持处置器具而产生的前端部主体的随时间的劣化的内窥镜。该内窥镜具备设置于插入部前端的前端部主体,前端部主体具有：立起台容纳空间形成壁,形成朝向与插入部的长度轴方向垂直的方向开口的立起台容纳空间；导出部,具有朝向立起台容纳空间内部开口的处置器具导出口；及立起台,在立起台容纳空间内,设置成在立起位置与倒伏位置之间以旋转轴为中心旋转自如,且具有引导处置器具的导向面,立起台容纳空间形成壁具有立起台容纳空间的开口侧的开口壁部,在开口壁部中,立起台位于立起位置时与导向面对置的对置壁部由比除对置壁部以外的其他壁部更硬的材质构成。(The invention provides an endoscope capable of suppressing deterioration of a distal end portion main body with 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 including: a standing platform accommodating space forming wall which forms a standing platform accommodating space opening towards the direction vertical to the length axis direction of the insertion part; a lead-out part having a treatment instrument lead-out port opening toward the interior of the standing table accommodating space; and an upright table provided in the upright table housing space so as to be rotatable about a rotation axis between an upright position and a collapsed position and having a guide surface for guiding the treatment instrument, the upright table housing space forming wall having an opening wall portion on an opening side of the upright table housing space, and in the opening wall portion, an opposing wall portion opposing the guide surface when the upright table is in the upright position is made of a material harder than other wall portions except the opposing wall portion.)

1. An endoscope comprising a distal end portion main body provided at a distal end of an insertion portion extending in a longitudinal axis direction,

the tip end body has:

a standing table accommodating space forming wall that forms a standing table accommodating space that is open in a direction perpendicular to the longitudinal axis direction;

a guide-out portion having a treatment instrument guide-out port which constitutes a distal end of a treatment instrument insertion passage inserted through and disposed inside the insertion portion and opens toward the interior of the standing table housing space; and

an upright base provided in the upright base housing space to be rotatable about a rotation axis between an upright position and a collapsed position and having a guide surface for guiding the treatment instrument led out from the treatment instrument outlet,

the standing stand accommodating space forming wall has an open wall portion on an opening side of the standing stand accommodating space,

in the opening wall portion, an opposing wall portion that opposes the guide surface when the raising table is at the raising position is made of a material harder than other wall portions other than the opposing wall portion.

2. The endoscope of claim 1,

the opposing wall portions are made of metal.

3. The endoscope of claim 1,

the opposing wall portions are made of ceramic.

4. The endoscope of claim 2,

the other wall portion is made of resin.

5. The endoscope of claim 3,

the other wall portion is made of resin.

6. The endoscope of any one of claims 1 to 5,

the opposing wall portion is integrally formed of the same material as a lead-out opening forming wall forming the treatment instrument lead-out opening.

7. The endoscope of any one of claims 1 to 5,

the opposing wall portion has an abutment surface against which a treatment instrument led out from the treatment instrument outlet abuts when the raising table is located at the raising position.

8. The endoscope of claim 7,

the opposing wall portion has a convex-shaped convex portion protruding toward the distal end side in the longitudinal axis direction,

the contact surface is constituted by a surface including a top of the convex portion.

9. The endoscope of claim 8,

the rising base has a concave guide surface for guiding the treatment instrument led out from the treatment instrument outlet,

the convex portion has a convex shape corresponding to the concave shape of the guide surface.

10. The endoscope of claim 9, wherein,

a clearance between the guide surface and the convex portion is 0.5mm or less in a state where the rising table is located at the rising position.

11. The endoscope of any one of claims 1 to 5,

the distal end portion main body is provided with an ultrasonic sensor having an ultrasonic transducer,

the standing base is disposed on a proximal end side in the longitudinal axis direction with respect to the ultrasonic sensor.

Technical Field

The present invention relates to an endoscope, and more particularly to an endoscope including a stand for standing a treatment instrument led out from an opening.

Background

Conventionally, in an endoscope, there is known a technique in which a raising table and a raising table housing space are provided in a distal end portion body of an insertion portion inserted into a body cavity, a treatment instrument inserted through a treatment instrument insertion channel and led out from an opening portion of the raising table housing space is raised by the raising table, and a lead-out direction of the treatment instrument is adjusted by changing a raising angle of the raising table.

For example, patent document 1 listed below describes an endoscope in which a protrusion is provided in a fixed connection tube and a fixed sleeve of a treatment instrument insertion tube in order to smoothly advance a treatment instrument from the treatment instrument insertion tube to the connection tube in an elevation angle manner. Patent document 2 describes an endoscope in which a 2 nd guide groove having a smaller opening width than a treatment instrument insertion hole is formed in an inner surface of the treatment instrument insertion hole in order to suppress the wobbling of a treatment instrument having a different cross-sectional diameter. Further, patent document 3 describes an ultrasonic endoscope in which a notch through which a flexible linear treatment instrument is passed is formed in a front wall of a lift table accommodating recess portion, thereby improving the degree of freedom in a protruding direction of the flexible linear treatment instrument.

Patent document 1: japanese patent laid-open publication No. 2017-086399

Patent document 2: international publication No. 2018/079790

Patent document 3: japanese patent No. 6223723 gazette

Endoscopes are used with various treatment instruments such as puncture needles, guide wires, and stents. For example, a treatment method of puncturing a cyst by puncturing a guide wire and using the guide wire as a guide indwelling stent to discharge a substance in the cyst into a digestive tract has been widely used.

However, when the treatment instrument (puncture needle) is removed with the guide wire as a guide, the guide wire may also move together with the puncture needle, and the guide wire may be detached from the cyst. If the guide wire is detached, the stent cannot be placed at a desired position with the guide wire as a guide after the puncture needle is removed. Further, the guide wire is newly installed, which causes the manual skill to be lengthened.

Then, the guide wire is sandwiched between the stand and the distal end portion body, and the sliding resistance of the guide wire is increased to suppress the guide wire from coming off the puncture position. The endoscope has a cable connected to an observation optical system in a distal end portion main body, and the ultrasonic endoscope has an ultrasonic transducer mounted on the distal end portion, the ultrasonic transducer being driven by a high voltage of about 50V. Therefore, the distal end portion main body is generally formed of a resin member from the viewpoint of electrical safety.

On the other hand, among the treatment instruments, a treatment instrument in which a puncture needle is formed of a metal tube such as stainless steel requires a large raising force in order to raise the treatment instrument by a raising stand having high bending rigidity. The larger the raising force (the force by which the puncture needle is bent by the raising table) is, the wider the width of the puncture angle of the puncture needle can be made, and a wider range of puncture can be made.

Disclosure of Invention

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 by a treatment instrument such as a puncture needle and a guide wire and suppressing deterioration with time.

In order to achieve the object of the present invention, an endoscope according to the present invention includes a distal end portion body provided at a distal end of an insertion portion extending in a longitudinal axis direction, the distal end portion body including: a standing table accommodating space forming wall which forms a standing table accommodating space opened in a direction perpendicular to the longitudinal axis direction; a guide-out portion having a treatment instrument guide-out port which constitutes a distal end of a treatment instrument insertion passage inserted through and disposed inside the insertion portion and opens toward the interior of the standing table housing space; and an upright table provided in the upright table housing space so as to be rotatable about a rotation axis between an upright position and a lying position and having a guide surface for guiding the treatment instrument led out from the treatment instrument lead-out opening, wherein the upright table housing space forming wall has an opening wall portion on an opening side of the upright table housing space, and in the opening wall portion, an opposing wall portion opposing the guide surface when the upright table is located at the upright position is made of a material harder than other wall portions except the opposing wall portion.

Effects of the invention

According to the endoscope of the present invention, in the opening wall portion of the standing table accommodation space formation wall, the opposing wall portion opposing the guide surface of the standing table is made of a material harder than the other wall portions except the opposing wall portion, and thus even if the treatment instrument is sandwiched between the standing table and the opposing wall portion, the grinding of the distal end portion body can be prevented and the degradation of the endoscope with time can be suppressed.

Drawings

Fig. 1 is an overall view of an ultrasonic endoscope of the present invention.

Fig. 2 is a perspective view showing an external appearance of the front end portion when the standing platform is in a fallen state.

Fig. 3 is a perspective view showing an external appearance of the front end portion when the standing stand is in a standing state.

Fig. 4 is a side sectional view of the front end portion.

Fig. 5 is a view seen from the direction C of fig. 4 in a state where the rising base is located at the falling position.

Fig. 6 is a view seen from the direction D of fig. 4 in a state where the rising base is located at the rising position.

Fig. 7 is a side sectional view showing a state where the guide wire is fixed.

Fig. 8 is a side sectional view showing the configuration of the tip end portion of a modification of embodiment 1.

Fig. 9 is a side sectional view showing the structure of the distal end portion of embodiment 2.

Description of the symbols

1-endoscope, 10-operation section, 12-insertion section, 14-universal cord, 16-angle knob, 18-raising operation rod, 20-air/water feeding button, 22-suction button, 24-treatment instrument introduction port, 30-flexible section, 32-bending section, 34, 134, 234-tip section, 36, 136, 236-tip section body, 37-body housing, 38-length axis of insertion section, 40-base section, 42-extension section, 44-observation window, 46A-1 st illumination window, 46B-2 nd illumination window, 48-air/water feeding nozzle, 50-ultrasonic sensor, 52-ultrasonic wave transmitting/receiving surface, 58-opening section, 60-raising stage, 60 a-guide surface, 62-raising stage housing space, 63-raising unit, 64-raising table housing space forming wall, 66, 166, 266-opening wall, 66A, 166A, 266A-opposing wall, 68, 168-protrusion, 70, 170, 270-other wall, 72 a-observation mechanism forming surface, 72b, 72 c-illumination mechanism forming surface, 72 d-nozzle forming surface, 80-treatment instrument lead-out port, 82-treatment instrument insertion channel, 84-lead-out portion, 86-lead-out port forming wall, 88-puncture needle, 90-guide wire, 92-rotation axis, 94-1 st surface, 96-2 nd surface.

Detailed Description

Hereinafter, an endoscope according to the present invention will be described with reference to the drawings.

(endoscope)

Fig. 1 is an overall view of an endoscope 1 to which the present invention is applied. In addition, the following embodiments are described taking an ultrasonic endoscope as an example, but the present invention can also be applied to endoscopes other than the ultrasonic endoscope. That is, the present invention can be applied to any endoscope having an opening through which the standing table and the treatment instrument are led out.

The endoscope 1 in fig. 1 is composed of an operation portion 10 which is gripped by an operator to perform various operations, an insertion portion 12 which is inserted into a body cavity of a patient, and a universal cord 14. The endoscope 1 is connected to a system configuration device such as a processor device and a light source device, not shown, constituting an endoscope system via a universal cord 14.

The operation unit 10 is provided with various operation members operated by an operator, for example, an angle knob 16, a raising operation lever 18, an air/water feeding button 20, a suction button 22, and the like.

The operation unit 10 is provided with a treatment instrument introduction port 24 for inserting a treatment instrument into the treatment instrument insertion passage inserted through the insertion portion 12.

The insertion portion 12 extends from the distal end of the operation portion 10, and is formed in an elongated shape with a small diameter as a whole.

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.

The soft portion 30 occupies most of the insertion portion 12 from the proximal end side thereof, and has flexibility to bend in any direction. When the insertion section 12 is inserted into the body cavity, the soft section 30 is bent along the insertion path into the body cavity.

The bending portion 32 is configured to be bent in the vertical direction and the lateral direction by the rotation operation of the corner knob 16 of the operation portion 10, and the distal end portion 34 can be oriented in a desired direction by the bending operation of the bending portion 32.

The distal end portion 34 includes a distal end portion body 36 described in detail below with reference to fig. 2 to 4, and an ultrasonic sensor 50 having a plurality of ultrasonic transducers is provided on a distal end side thereof.

The universal cord 14 shown in fig. 1 contains internally a cable, light guide and fluid hose. A connector is provided at an end portion, not shown, of the universal cord 14, and by connecting the connector to a predetermined system configuration device constituting the endoscope system, such as a processor device and a light source device, electric power, a control signal, illumination light, liquid, gas, and the like necessary for operating the endoscope 1 are supplied from the system configuration device to the endoscope 1, and data of an observation image acquired by the imaging unit and data of an ultrasonic image acquired by the ultrasonic sensor are transmitted from the endoscope 1 to the system configuration device. The observation image and the ultrasonic image transmitted to the system configuration device are displayed on a display, and can be observed by an operator or the like.

EXAMPLE 1 embodiment

(Structure of front end)

Next, the configuration of the distal end portion 34 of the insertion portion 12 of the endoscope according to embodiment 1 will be described. Fig. 2 is a perspective view showing an external appearance of the distal end portion 34, and is a view showing a state in which the rising base 60 is positioned at the falling position. Fig. 3 is a perspective view showing an external appearance of the distal end portion 34, and is a view showing a state in which the raising table 60 is located at a raising position. Fig. 4 is a side sectional view.

The distal end portion 34 has a distal end portion main body 36 forming a partition wall between the outer wall and the inside thereof, and each component disposed in the distal end portion main body 36 is accommodated and held in an accommodation portion provided in the distal end portion main body 36.

Although detailed description is omitted, the distal end portion main body 36 is detachable with a part thereof being a separate block, and each component can be assembled in a predetermined housing portion in a state where the separate block is detached. After the respective components are assembled in the housing portion, the separate block is attached to the distal end portion body 36, whereby the respective components are housed in and held by the housing portion and fixed to the distal end portion 34.

The distal end portion main body 36 is formed of an insulating material having insulating properties, for example, a resin material such as a methacrylic resin, a polyphenylene sulfone resin, a polyetherimide resin, a polyether ether ketone resin, or a plastic such as a polycarbonate.

As shown in fig. 2 to 4, the distal end portion main body 36 includes a base portion 40 that constitutes an observation optical system, a lead-out portion, and a stand for guiding a treatment instrument led out from the lead-out portion; an extension part 42 extending from the base part 40 to the front end side and storing the ultrasonic sensor 50.

A convex ultrasonic sensor 50 that transmits and receives ultrasonic waves is disposed in the extension portion 42. The ultrasonic sensor 50 has an ultrasonic transmitting/receiving surface 52, and the ultrasonic transmitting/receiving surface 52 is formed by arranging ultrasonic transducers in a curved shape along the longitudinal axis 38 direction of the insertion portion 12. Data for generating an ultrasonic image of the in-vivo tissue is acquired by the ultrasonic sensor 50.

As shown in fig. 2 and 3, the distal end portion body 36 is provided with an observation window 44, a 1 st illumination window 46A, a 2 nd illumination window 46B, an air/water supply nozzle 48, and an opening portion 58 for guiding out a treatment instrument.

The opening 58 is provided in the base 40 of the distal end portion body 36, and the treatment instrument is guided out from the opening 58 into the scanning range of the ultrasonic wave of the ultrasonic sensor 50. The standing table housing space 62 is a space defined by a standing table housing space forming wall 64, and the opening portion 58 is formed to open in a direction perpendicular to the longitudinal axis 38 direction of the insertion portion 12 of the standing table housing space 62.

As shown in fig. 2 and 4, a lead-out portion 84 having a treatment instrument lead-out port 80 that opens toward the inside of the standing table accommodating space 62 is disposed on the base end side of the standing table accommodating space 62. The treatment instrument outlet port 80 communicates with the treatment instrument inlet port 24 (see fig. 1) of the operation unit 10 via a treatment instrument insertion passage 82 inserted through the insertion portion 12. Thus, when the endoscope is inserted into the body cavity and a treatment or observation is performed, the treatment instrument inserted from the treatment instrument introduction port 24 is guided out from the treatment instrument introduction port 80 (see fig. 4) to the standing table housing space 62.

The raising table 60 is disposed in front of the treatment instrument outlet 80 which becomes the raising table accommodating space 62. The raising table 60 is provided to be rotatable about the rotation shaft 92 between a raising position and a falling position. The standing stand 60 is formed of a metal material such as stainless steel, and has a concave guide surface 60a which is curved upward from the base end side toward the tip end side of the tip end portion main body 36 on the upper surface side. The treatment instrument led out from the treatment instrument outlet 80 is directed upward along the guide surface 60a in the longitudinal axial direction of the insertion portion 12 and led out from the opening 58 on the upper side of the standing platform accommodating space 62.

The raising table 60 is rotated about the rotation shaft 92 by operating the raising operation lever 18 shown in fig. 1, and performs a raising operation. By adjusting the rising angle from the collapsed state by the rising operation of the rising base 60, the lead-out direction (lead-out angle) of the treatment instrument led out from the opening 58 can be changed.

The distal end portion body 36 includes a raising unit 63, and a raising table 60 is disposed in the raising unit 63. The raising unit 63 is formed of, for example, a metal material having corrosion resistance.

The treatment instrument insertion channel 82 shown in fig. 4 is also connected to a suction channel not shown, and body fluid or the like can be sucked from the opening 58 by operating the suction button 22 shown in fig. 1.

The observation window 44 is disposed on the observation mechanism forming surface 72a provided on the base end side of the standing stand accommodating space 62. An imaging system unit in which an imaging optical system constituting an imaging section and a solid-state imaging element are integrally assembled is housed in the observation window 44. Thus, when light from the treatment unit which is a field of view of the imaging unit is taken in from the observation window 44, the light is formed as an observation image on the solid-state imaging element via the imaging optical system. That is, the treatment portion is photographed by the solid-state imaging element.

The 1 st illumination window 46A and the 2 nd illumination window 46B are provided on the illumination mechanism formation surfaces 72B and 72 c. A light emitting portion constituting an illumination portion is housed inside the 1 st illumination window 46A and the 2 nd illumination window 46B. Illumination light transmitted from a light source device connected to the universal cord 14 through a light guide is emitted from the light emitting portion, and the illumination light is irradiated to the treatment portion in the field of view range of the imaging portion through the 1 st illumination window 46A and the 2 nd illumination window 46B.

The air/water feeding nozzle 48 is provided on the nozzle forming surface 72 d. Then, by operating the air/water feeding button 20 in fig. 1, the cleaning liquid, water, air, or the like is ejected from the air/water feeding nozzle 48 in fig. 2 and 3 toward the observation window 44 to clean the observation window 44.

Next, the positional relationship among the opening 58, the standing stand accommodating space 62, and the observation window 44 will be described. As shown in fig. 2, when the position of the opening 58 is set as a reference position, the position of the observation window 44 in the direction indicated by the arrow a (the opening direction of the opening 58) is arranged at a position on the opposite side of the standing stand accommodating space 62. That is, when the distal end portion main body 36 is projected on a virtual plane orthogonal to the longitudinal axis 38 direction, the observation window 44 is disposed on the opening side (opening portion 58 side) of the standing stand accommodating space 62. By setting the observation window 44 above the opening 58 in this manner, the treatment instrument can be brought into the observation field of view of the observation window 44 at the position where the treatment instrument is led out from the opening 58. Therefore, the treatment instrument can be guided to the target position, and sniping of the treatment instrument to the target position can be improved.

The position between the observation window 44 and the standing stand accommodating space 62 in the direction indicated by the arrow B in fig. 2 is preferably such that the observation window 44 is offset from the standing stand accommodating space 62 in the direction indicated by the arrow B. The observation window 44 is disposed offset from the standing platform accommodation space 62 in the direction indicated by arrow B, which means that the center line of the observation window 44 is offset in the direction indicated by arrow B with respect to the center line of the standing platform 60. With this configuration, even in a state where the rising base 60 is raised and the treatment instrument is led out from the opening 58, the observation field of view of the observation window 44 can be prevented from being blocked by the treatment instrument and the rising base 60, and the treatment position can be reliably confirmed in the observation window 44.

The distal end portion main body 36 is formed by assembling a metallic standing unit 63 to the main body case 37 made of resin. The standing table accommodating space 62 is formed by a standing table accommodating space forming wall 64. In the standing-table-accommodating-space-forming wall 64, a part is constituted by the standing unit 63, and the other part is constituted by the main body case 37.

The standing-table-accommodating-space forming wall 64 has an opening wall portion 66 on the opening portion 58 side thereof. The opening wall 66 has a facing wall 66A facing the guide surface 60a of the rising base 60 in a state where the rising base 60 shown by a two-dot chain line in fig. 4 is located at the rising position. The opposing wall 66A is a part of the components of the rising unit 63. That is, the opposing wall 66A is made of metal. Of the opening wall portion 66, the other wall portion 70 than the opposing wall portion 66A is a part of the constituent elements of the main body case 37 and is made of resin.

That is, in the present embodiment, the opposing wall portion 66A is formed of metal, the other wall portion 70 is formed of resin, and the opposing wall portion 66A is formed of a material harder than the other wall portion 70. The "other wall portion" refers to a wall portion provided on the front end side of the rising base 60 and wall portions on both side surfaces of the rising base 60, among the opening wall portions 66 forming the opening 58.

The raising unit 63 is provided with a treatment instrument outlet 80 connected to the distal end of the treatment instrument insertion passage 82. The treatment instrument outlet 80 is formed by an outlet forming wall 86. That is, the treatment instrument outlet 80 and the outlet forming wall 86 are constituted by the rising unit 63. The opposing wall 66A is formed integrally with the lead-out opening forming wall 86 and is made of the same material.

The opposing wall 66A has a convex protrusion 68 protruding toward the distal end in the longitudinal axis 38 direction. The convex portion 68 is formed in a convex shape corresponding to the concave-shaped guide surface 60a of the rising base 60. By making the convex shape of the convex portion 68 correspond to the concave shape of the guide surface 60a, the guide wire can be sandwiched between the guide surface 60a and the convex portion 68 and fixed (locked) in a state where the rising table 60 is located at the rising position.

Fig. 5 to 7 are views in which the treatment instrument is held by the opposing wall portion 66A and the raising base 60, and fig. 5 is a view as viewed from the direction C in fig. 4 in a state in which the raising base 60 is located at the falling position. Fig. 6 is a view seen from the direction D in fig. 4 with the stand 60 located at the stand position. Fig. 7 is a side cross-sectional view showing a state in which the guide wire 90 is fixed to the standing stand 60 and the opposing wall portion 66A.

As shown in fig. 5, the rising base accommodating space 62 side of the protrusion 68 formed in the opposing wall portion 66A has a 1 st surface 94, and the 1 st surface 94 is formed in a concave shape so as to be separated from the guide surface 60a of the rising base 60. Thus, for example, in a treatment instrument having a large diameter of the puncture needle 88 as shown by a two-dot chain line in fig. 5, the treatment instrument can be held between two surfaces (the 1 st surface 94 and the guide surface 60a) configured to be recessed so as to be separated from each other. This prevents the treatment instrument from being displaced in the lateral direction (direction B in fig. 2) in fig. 5, and the treatment instrument can be stably held.

As shown in fig. 6 and 7, in a state of being further raised than fig. 5, the treatment instrument having a small diameter of the guide wire 90 as shown by the two-dot chain line in fig. 6 can be held by forming the convex portion 68 to have a convex shape so as to follow the shape of the concave guide surface 60a and by bringing the 2 nd surface 96 including the top portion of the convex portion 68 close to the guide surface 60 a. The 2 nd surface 96 serves as a contact surface with which the treatment instrument comes into contact. As shown in fig. 7, since the wire 90 has a small diameter and low bending rigidity, even if it is held between the standing stand 60 and the convex portion 68, the wire 90 is not bent and separated from the puncture point where the puncture needle punctures, and the wire 90 can be fixed.

In this way, the guide wire 90 is sandwiched and fixed between the guide surface 60a of the standing table 60 and the convex portion 68 of the opposing wall portion 66A. Since the opposing wall 66A is made of a material harder than the other wall 70 of the opening wall 66 except the opposing wall 66A, the opposing wall 66A can be prevented from being ground by the raising force of the raising table 60 even if the treatment instrument is held between the guide surface 60a, the convex portion 68, and the opposing wall 66A. Further, by providing the projection 68, the guide wire can be sandwiched and fixed between the guide surface 60a and the projection 68. The material of the opposing wall 66A may be ceramic in addition to metal.

Further, in a state where the raising base 60 is located at the raising position, the width of the gap between the guide surface 60a and the top end of the convex portion 68 is preferably set to 0.5mm or less. Since the conventional guide wire has a diameter of 0.6mm, the guide wire can be held between the projection 68 and the guide surface 60a by setting the diameter to 0.5mm or less.

As described above, according to the present embodiment, in the opening wall portion 66 on the opening side of the standing table accommodation space forming wall 64 forming the standing table accommodation space 62, the opposing wall portion 66A opposing the guide surface 60a when the standing table 60 is at the standing position is made of a material harder than the other wall portion 70 except the opposing wall portion 66A. Thus, when the treatment instrument is held between the guide surface 60a and the opposing wall 66A, the opposing wall can be prevented from being ground. Further, by using a hard material, the opposing wall portion can be prevented from being ground even when the treatment instrument is held with a large standing force. Further, by providing the projection 68, the guide wire can be sandwiched and fixed between the guide surface 60a and the projection 68.

Modifications of the examples

Fig. 8 is a side sectional view showing the configuration of the tip end portion of a modification of embodiment 1. The opposing wall portion 66A of the distal end portion 34 shown in fig. 2 to 4 is formed as a part of the constituent elements of the rising unit 63, and is formed integrally with the lead-out opening forming wall 86.

In contrast, the distal end portion 134 shown in fig. 8 is formed separately from the rising unit 63 and the opposing wall portion 166A including the convex portion 168 of the opening wall portion 166, and is made of a material harder than the other wall portion 170. Even if only the opposing wall 166A is made of a hard material in this way, the portion pressed by the raising table 60 when fixing the guide wire is the opposing wall 166A, and therefore grinding of the opposing wall 166A and deterioration of the distal end portion main body 136 can be prevented. Further, unlike the raising unit 63, the material of the opposing wall portion 166A can be changed to a hard material.

The 2 nd embodiment is

Fig. 9 is a side sectional view showing the structure of the distal end portion 234 of the endoscope according to embodiment 2. The distal end portion 234 of embodiment 2 is different from the distal end portion 34 of the endoscope of embodiment 1 in that it does not have a convex portion on the facing wall portion 266A of the opening wall portion 266. In embodiment 2, the opposing wall portion 266A is also made of a material harder than the other wall portions 270.

Even if the treatment instrument does not have the projection, the treatment instrument can be held between the opposing wall 266A and the rising base 60 in a treatment instrument having a large diameter. At this time, by making the opposing wall portion 266A hard, even if the treatment instrument is pressed by the opposing wall portion 266A by the raising table 60, the opposing wall portion 266A can be prevented from being ground. Therefore, the deterioration of the tip end portion main body 236 with time can be prevented.

In the above, the convex ultrasonic sensor has been described, but the present invention is not limited to the convex ultrasonic sensor, and can be applied to a radial ultrasonic sensor.