阅读说明：本技术 外套管 (Outer sleeve ) 是由 高桥伸治 于 2019-08-01 设计创作，主要内容包括：本发明提供一种执业医师能够轻松地把持的外套管。外套管具备：软管主体；把持筒体,与软管主体的基端侧连结；球囊,安装于软管主体的前端侧的外周面；及送气管路,从软管主体到把持筒体而与内窥镜插通路并列设置,并且与球囊连通。把持筒体具备：第1连接管,从把持筒体侧部的第1位置朝向把持筒体的基端侧向斜外侧延伸；及第2连接管,从与第1位置不同的第2位置朝向把持筒体的基端侧向斜外侧延伸,把持筒体为第1连接管与第2连接管一体成型的一体成型体。当将与把持筒体的中心轴正交的平面设为第1面,将与第1面正交且与送气管路交叉的平面设为第2面时,相对于与第1面正交且与第2面正交的基准面,第1位置及第2位置配置于同一侧。(The invention provides an outer sleeve which can be easily held by a medical practitioner. The outer sleeve is provided with: a hose body; a grip cylinder connected to the proximal end side of the hose body; a balloon attached to an outer peripheral surface of the distal end side of the hose body; and an air supply pipe which is arranged in parallel with the endoscope insertion passage from the hose body to the grip cylinder and communicates with the balloon. The grip cylinder includes: a 1 st connecting pipe extending obliquely outward from a 1 st position on a side of the grip cylinder toward a base end of the grip cylinder; and a 2 nd connecting pipe extending obliquely outward from a 2 nd position different from the 1 st position toward a base end side of the grip cylinder, the grip cylinder being an integrally molded body in which the 1 st connecting pipe and the 2 nd connecting pipe are integrally molded. When a plane orthogonal to the central axis of the grip cylinder is a 1 st plane and a plane orthogonal to the 1 st plane and intersecting the air supply duct is a 2 nd plane, the 1 st position and the 2 nd position are disposed on the same side with respect to a reference plane orthogonal to the 1 st plane and orthogonal to the 2 nd plane.)

1. An overtube having an endoscope insertion path through which an endoscope can be inserted, the overtube comprising:

a hose body in which a 1 st insertion path constituting a part of the endoscope insertion path is formed;

a grip cylinder connected to a proximal end side of the hose main body and having a 2 nd insertion path formed therein, the 2 nd insertion path constituting another part of the endoscope insertion path;

a balloon attached to an outer peripheral surface of the distal end side of the hose main body; and

an air supply pipe which is provided in parallel with the endoscope insertion passage from the hose main body to the grip cylinder and communicates with the balloon,

the grip cylinder includes:

a 1 st connection pipe extending obliquely outward from a 1 st position of a side portion of the grip cylinder between a base end and a tip end of the grip cylinder toward the base end side of the grip cylinder, and having a gas pipe communicating with the gas supply pipe; and

a 2 nd connection pipe extending obliquely outward from a 2 nd position different from the 1 st position on a side portion of the grip cylindrical body toward a base end side of the grip cylindrical body and having a liquid conduit communicating with the 2 nd insertion passage,

the grip cylinder is an integrally formed body in which the 1 st connection pipe and the 2 nd connection pipe are integrally formed,

when a plane orthogonal to the central axis of the gripping cylinder is a 1 st plane and a plane orthogonal to the 1 st plane and intersecting the air supply duct is a 2 nd plane, the 1 st position and the 2 nd position are disposed on the same side with respect to a reference plane orthogonal to the 1 st plane and orthogonal to the 2 nd plane.

2. An overtube having an endoscope insertion path through which an endoscope can be inserted, the overtube comprising:

a hose body in which a 1 st insertion path constituting a part of the endoscope insertion path is formed;

a grip cylinder connected to a proximal end side of the hose main body and having a 2 nd insertion path formed therein, the 2 nd insertion path constituting another part of the endoscope insertion path;

a balloon attached to an outer peripheral surface of the distal end side of the hose main body; and

an air supply pipe which is provided in parallel with the endoscope insertion passage from the hose main body to the grip cylinder and communicates with the balloon,

the grip cylinder includes:

a 1 st connection pipe extending obliquely outward from a 1 st position of a side portion of the grip cylinder between a base end and a tip end of the grip cylinder toward the base end side of the grip cylinder, and having a gas pipe communicating with the gas supply pipe; and

a 2 nd connection pipe extending obliquely outward from a 2 nd position different from the 1 st position on the side portion of the grip cylindrical body toward the base end of the grip cylindrical body and having a liquid conduit communicating with the 2 nd insertion passage,

the grip cylinder is an integrally formed body in which the 1 st connection pipe and the 2 nd connection pipe are integrally formed,

when viewed from the axial direction of the central shaft of the grip cylinder, an angle formed by a 1 st line connecting the central shaft and the 1 st position and a 2 nd line connecting the central shaft and the 2 nd position is an acute angle or 0 degree.

3. The outer sleeve of claim 1 or 2,

the side portion of the grip cylinder has a flange-like stopper extending outward from the inside in the radial direction of the center axis of the grip cylinder,

the 1 st position and the 2 nd position are located on a surface of the stopper on the base end side.

4. The outer sleeve according to any one of claims 1 to 3,

the side portion of the grip cylinder has a relay pipe that constitutes a part of the gas supply pipe and communicates with the gas pipe,

the gas pipeline is connected with the relay pipeline in a bending mode.

5. The outer sleeve of claim 4,

the gas pipe is provided to be inclined more obliquely outward toward the base end side of the grip cylinder than the relay pipe.

6. The outer sleeve of claim 5,

when a plane orthogonal to the central axis of the gripping cylinder is defined as a 1 st plane, and a plane orthogonal to the 1 st plane and intersecting the air supply duct is defined as a 2 nd plane, the angle of the duct axis of the gas duct with respect to a reference plane orthogonal to the 1 st plane and orthogonal to the 2 nd plane is 40 degrees or less.

7. The outer sleeve according to any one of claims 1 to 6,

when the 1 st connection pipe and the 2 nd connection pipe are projected on a plane orthogonal to the central axis of the grip cylinder, at least a partial region of the 1 st connection pipe and the 2 nd connection pipe overlap each other.

8. The outer sleeve according to any one of claims 1 to 7,

the 1 st position and the 2 nd position are the same position in the circumferential direction of the center axis of the grip cylinder.

9. The outer sleeve according to any one of claims 1 to 8,

when the distance between the central axis of the holding cylinder and the 1 st position is a 1 st distance and the distance between the central axis of the holding cylinder and the 2 nd position is a 2 nd distance, the 1 st distance is greater than the 2 nd distance.

10. The outer sleeve according to any one of claims 1 to 8,

the 2 nd connecting pipe is disposed between the 1 st connecting pipe and the grip cylinder.

11. The outer sleeve of any one of claims 1-10,

the 1 st position and the 2 nd position are positions closer to the base end of the grip cylinder than the distal end of the grip cylinder.

12. An overtube having an endoscope insertion path through which an endoscope can be inserted, the overtube comprising:

a hose body in which a 1 st insertion path constituting a part of the endoscope insertion path is formed;

a grip cylinder connected to a proximal end side of the hose main body and having a 2 nd insertion path formed therein, the 2 nd insertion path constituting another part of the endoscope insertion path;

a balloon attached to an outer peripheral surface of the distal end side of the hose main body; and

an air supply pipe which is provided in parallel with the endoscope insertion passage from the hose main body to the grip cylinder and communicates with the balloon,

the grip cylinder includes:

a 1 st connection pipe extending obliquely outward from a 1 st position of a side portion of the grip cylinder between a base end and a tip end of the grip cylinder toward the base end side of the grip cylinder, and having a gas pipe communicating with the gas supply pipe; and

a 2 nd connection pipe extending obliquely outward from a 2 nd position different from the 1 st position on the side portion of the grip cylindrical body toward the base end of the grip cylindrical body and having a liquid conduit communicating with the 2 nd insertion passage,

the grip cylinder is an integrally formed body in which the 1 st connection pipe and the 2 nd connection pipe are integrally formed,

the side portion of the grip cylinder has a flange-like stopper extending outward from the inside in the radial direction of the center axis of the grip cylinder,

the 1 st position and the 2 nd position are positions between the stopper or the base end of the grip cylinder and the stopper.

13. The outer sleeve according to any one of claims 1 to 12,

in the gas pipe and the liquid pipe of the gripping cylinder, the gas pipe is disposed outside the liquid pipe with respect to a central axis of the gripping cylinder.

Technical Field

The present invention relates to an overtube having an endoscope insertion passage through which an endoscope can be inserted.

Background

In the medical field, endoscopes are inserted into, for example, a curved intestinal tract of a small intestine and a large intestine, and are used for performing operations of fingers such as observation, diagnosis, and treatment of an inner wall surface. Since the intestinal tract is bent complicatedly, the insertion force is not transmitted from the insertion portion of the endoscope to the distal end portion, and the distal end portion is difficult to move forward. Further, the insertion tip portion of a patient after operation, such as choledocystic jejunostomy (Roux-en-Y Method) for insertion into the deep small intestine or gastric resection, is more difficult to move forward, and is often referred to as a "difficult-to-insert example".

In order to solve the insertion difficulty, a technique of using a balloon-equipped overtube (electrically referred to as an insertion aid) in combination with an endoscope has been proposed (for example, see patent document 1).

Prior art documents

Patent document

Patent document 1: japanese laid-open patent publication No. 2008-136740

Disclosure of Invention

Technical problem to be solved by the invention

However, in the outer tube of patent document 1, the liquid supply channel and the gas supply/discharge channel are arranged substantially symmetrically with respect to the axis of the outer tube on the proximal end side, and therefore, there is a problem that it is difficult for the medical practitioner to hold the proximal end of the outer tube.

The present invention has been made in view of such circumstances, and an object thereof is to provide an outer tube that a medical practitioner can easily hold.

Means for solving the technical problem

An overtube according to claim 1 is provided with an endoscope insertion path through which an endoscope can be inserted, and the overtube includes: a hose body having a 1 st insertion path formed therein, the 1 st insertion path constituting a part of an endoscope insertion path; a grip cylinder connected to the proximal end side of the hose body and having a 2 nd insertion path formed therein, the 2 nd insertion path constituting the other part of the endoscope insertion path; a balloon attached to an outer peripheral surface of the distal end side of the hose body; and an air supply pipe which is provided in parallel with the endoscope insertion passage from the hose body to the grip cylinder and communicates with the balloon, wherein the grip cylinder includes: a 1 st connecting pipe which extends obliquely outward from a 1 st position of a side portion of the grip cylinder between the base end and the tip end of the grip cylinder toward the base end side of the grip cylinder, and has a gas pipe communicating with the gas supply pipe; and a 2 nd connecting pipe extending obliquely outward from a 2 nd position different from the 1 st position on a side portion of the grip cylinder toward a base end side of the grip cylinder and having a liquid conduit communicating with the 2 nd insertion passage, the grip cylinder being an integrally molded body in which the 1 st connecting pipe and the 2 nd connecting pipe are integrally molded, and the 1 st position and the 2 nd position being disposed on the same side with respect to a reference plane orthogonal to the 1 st surface and orthogonal to the 2 nd surface when a plane orthogonal to a central axis of the grip cylinder is taken as the 1 st surface and a plane orthogonal to the 1 st surface and intersecting the air supply conduit is taken as the 2 nd surface. According to the first aspect of the present invention, the medical practitioner can easily grip the grip cylinder of the outer tube.

An overtube according to claim 2 is provided with an endoscope insertion path through which an endoscope can be inserted, and the overtube includes: a hose body having a 1 st insertion path formed therein, the 1 st insertion path constituting a part of an endoscope insertion path; a grip cylinder connected to the proximal end side of the hose body and having a 2 nd insertion path formed therein, the 2 nd insertion path constituting the other part of the endoscope insertion path; a balloon attached to an outer peripheral surface of the distal end side of the hose body; and an air supply pipe which is provided in parallel with the endoscope insertion passage from the hose body to the grip cylinder and communicates with the balloon, wherein the grip cylinder includes: a 1 st connecting pipe which extends obliquely outward from a 1 st position of a side portion of the grip cylinder between the base end and the tip end of the grip cylinder toward the base end side of the grip cylinder, and has a gas pipe communicating with the gas supply pipe; and a 2 nd connecting pipe extending obliquely outward from a 2 nd position different from the 1 st position on a side portion of the grip cylinder toward a base end of the grip cylinder and having a liquid conduit communicating with the 2 nd insertion passage, the grip cylinder being an integrally molded body in which the 1 st connecting pipe and the 2 nd connecting pipe are integrally molded, and an angle formed by a 1 st straight line connecting the center axis and the 1 st position and a 2 nd straight line connecting the center axis and the 2 nd position being an acute angle or 0 degree when viewed from an axial direction of a center axis of the grip cylinder. According to the 2 nd aspect, the medical practitioner can easily grip the grip cylinder of the outer tube.

In the outer tube according to claim 3, the side portion of the grip cylinder has a flange-like stopper formed to extend outward from the inside in the radial direction of the central axis of the grip cylinder, and the 1 st position and the 2 nd position are located on the surface of the stopper on the base end side. According to the 3 rd aspect, since the stopper of the outer tube is in contact with the guard teeth included in the subject, the position of the outer tube relative to the subject can be fixed.

In the outer tube according to claim 4, the side portion of the grip cylinder has a relay pipe that constitutes a part of the air supply pipe and communicates with the gas pipe, and the gas pipe and the relay pipe are connected by bending. According to the 4 th aspect, the 1 st connection pipe formed with the gas pipe can extend outward from the 1 st position without being affected by the relay pipe, and therefore the degree of freedom in designing the grip cylindrical body can be increased.

In the outer tube according to claim 5, the gas line is provided so as to be inclined obliquely outward toward the base end side of the grip cylinder relative to the intermediate line. According to the 5 th aspect, the 1 st connection pipe formed with the gas pipe line is inclined outward, and the 1 st connection pipe is separated from the side portion of the grip cylinder, so that the medical practitioner can more easily grip the grip cylinder of the outer tube.

In the outer tube according to claim 6, when a plane orthogonal to the central axis of the grip cylindrical body is defined as a 1 st plane and a plane orthogonal to the 1 st plane and intersecting the air supply duct is defined as a 2 nd plane, an angle of a duct axis of the gas duct with respect to a reference plane orthogonal to the 1 st plane and orthogonal to the 2 nd plane is 40 degrees or less. According to the 6 th aspect, the gas pipe can be easily molded by setting the angle of the pipe axis of the gas pipe to 40 degrees or less.

In the outer tube according to claim 7, when the 1 st connection tube and the 2 nd connection tube are projected on a plane orthogonal to the central axis of the grip cylinder, at least a partial region of the 1 st connection tube and the 2 nd connection tube overlap each other. According to the 7 th aspect, the 1 st connecting pipe and the 2 nd connecting pipe are brought close to each other, whereby the grip cylinder can be reduced in size.

In the outer tube according to the 8 th aspect, the 1 st position and the 2 nd position are the same position in the circumferential direction of the central axis of the gripping cylinder. According to the 8 th aspect, the grip cylinder can be made smaller by bringing the 1 st position and the 2 nd position closer to each other.

In the outer tube according to claim 9, when the distance between the central axis of the gripping cylinder and the 1 st position is defined as the 1 st distance and the distance between the central axis of the gripping cylinder and the 2 nd position is defined as the 2 nd distance, the 1 st distance is larger than the 2 nd distance.

In the outer tube according to claim 10, the 2 nd connecting tube is provided between the 1 st connecting tube and the grip cylinder.

According to the 9 th or 10 th aspect, since the air supply pipeline is not blocked by the liquid pipeline, the air supply pipeline can be provided in parallel to the balloon along the hose main body.

In the outer tube according to the 11 th aspect, the 1 st position and the 2 nd position are positions closer to the base end of the grip cylinder than the distal end of the grip cylinder. According to the 11 th aspect, the length of the outer tube insertable into the body cavity of the subject can be increased.

An overtube according to claim 12 is provided with an endoscope insertion path through which an endoscope can be inserted, and the overtube includes: a hose body having a 1 st insertion path formed therein, the 1 st insertion path constituting a part of an endoscope insertion path; a grip cylinder connected to the proximal end side of the hose body and having a 2 nd insertion path formed therein, the 2 nd insertion path constituting the other part of the endoscope insertion path; a balloon attached to an outer peripheral surface of the distal end side of the hose body; and an air supply pipe which is provided in parallel with the endoscope insertion passage from the hose body to the grip cylinder and communicates with the balloon, wherein the grip cylinder includes: a 1 st connecting pipe which extends obliquely outward from a 1 st position of a side portion of the grip cylinder between the base end and the tip end of the grip cylinder toward the base end side of the grip cylinder, and has a gas pipe communicating with the gas supply pipe; and a 2 nd connecting pipe extending obliquely outward from a 2 nd position different from the 1 st position of the side portion of the grip cylinder toward the base end of the grip cylinder and having a liquid pipe communicating with the 2 nd insertion passage, the grip cylinder being an integrally molded body in which the 1 st connecting pipe and the 2 nd connecting pipe are integrally molded, the side portion of the grip cylinder having a flange-shaped stopper formed to extend outward from the inside in the radial direction of the central axis of the grip cylinder, and the 1 st position and the 2 nd position being positions between the stopper and the base end of the grip cylinder. According to the 12 th aspect, the length of the outer tube insertable into the body cavity of the subject can be increased.

In the outer tube according to claim 13, the gas line is disposed outside the liquid line with respect to the central axis of the grip cylinder, among the gas line and the liquid line of the grip cylinder. According to the 13 th aspect, when the medical practitioner grips the grip barrel, the hose from the device for supplying air into the balloon can be positioned at a position where it is less likely to be an obstacle.

Effects of the invention

According to the present invention, the medical practitioner can easily grip the grip cylinder of the outer tube.

Drawings

Fig. 1 is a system configuration diagram of an endoscope apparatus.

Fig. 2 is an enlarged perspective view of the distal end portion of the insertion portion.

Fig. 3 is a cross-sectional view along a central axis of the outer sleeve.

Fig. 4 is a view of the outer tube of fig. 3 as viewed from the base end side along the central axis.

Fig. 5 is a view of the grip cylinder as viewed from the proximal end side along the central axis.

Fig. 6 is a side view of the grip cylinder including the 1 st connection pipe and the 2 nd connection pipe as viewed from the side of the grip cylinder.

Fig. 7 is a view of the grip cylinder of fig. 6 as viewed from the proximal end side along the central axis.

Fig. 8 is a perspective view of the grip cylinder including the 1 st connection pipe and the 2 nd connection pipe as viewed from the proximal end side.

Fig. 9 is a view of the grip cylinder of fig. 8 as viewed from the proximal end side along the central axis.

Fig. 10 is a perspective view of the grip cylinder including the 1 st connection pipe and the 2 nd connection pipe.

Fig. 11 is a perspective view of the grip cylinder of fig. 10 as viewed from the proximal end side.

Fig. 12 is a view of the grip cylinder as viewed from the proximal end side along the central axis.

Fig. 13 is a view showing a state in which the outer tube is attached to a subject.

Fig. 14 is a view of the grip cylinder as viewed from the proximal end side along the central axis.

Fig. 15 is a side view of the grip cylinder including the 1 st connection pipe and the 2 nd connection pipe as viewed from the side of the grip cylinder.

Fig. 16 is a perspective view of the grip cylinder including the 1 st connection pipe and the 2 nd connection pipe as viewed from the proximal end side.

Fig. 17 is a side view of the grip cylinder including the 1 st connection pipe and the 2 nd connection pipe as viewed from the side of the grip cylinder.

Fig. 18 is a view showing a state in which the outer tube according to embodiment 3 is attached to a subject.

Detailed Description

[ embodiment 1 ]

The outer sleeve of embodiment 1 will be explained with reference to the drawings. Fig. 1 is a system configuration diagram of an endoscope apparatus 1. As shown in fig. 1, the endoscope apparatus 1 includes a flexible endoscope 14, an overtube 10, a balloon control apparatus 100, and the like.

The endoscope 14 includes a handheld operation portion 16 and an insertion portion 18 provided in the handheld operation portion 16. A universal cable 20 is connected to the handheld operation unit 16. The universal cable 20 includes a signal cable (not shown), a light guide (not shown), an air supply pipe (not shown), and the like. A connector 21A and a connector 21B are provided at the tip of the universal cable 20. The connector 21A is connected to the light source device 24. The connector 21B branches from the connector 21A and is connected to the processor 30. Further, a display 60 is connected to the processor 30.

A balloon air supply port 42 is provided in the connector 21A. The balloon air supply port 42 supplies air to the inside of the 1 st balloon BL1 or sucks air from the inside of the 1 st balloon BL 1. The "air" referred to herein is a gas for inflating the 1 st balloon BL1 (including the 2 nd balloon BL2 described later), and the type (component) thereof is not particularly limited. The balloon air-supply port 42 is connected to the balloon control device 100 via a hose 104.

The hand-held operation unit 16 is provided with an air/water feeding button 32, a suction button 34, and a shutter button 36 in parallel, and a pair of corner buttons 38 and a treatment instrument insertion unit 39.

The insertion portion 18 is inserted into an intestinal tract such as a small intestine and a large intestine. The insertion portion 18 is composed of a soft portion 44, a bent portion 46, and a distal end portion 48 from the proximal end side toward the distal end side.

The flexible portion 44 is provided at the base end of the bending portion 46 and has flexibility. The bending portion 46 is remotely bent (angle-operated) by operating a pair of corner knobs 38 provided on the manual operation portion 16. The pair of corner buttons 38 are capable of orienting the front end face 50 of the front end portion 48 in a desired direction.

Further, a 1 st balloon BL1 is attached to the outer peripheral surface of the curved portion 46. The balloon air supply port 42 is connected to an air supply pipe inserted into the insertion portion 18 and the connector 21A. The air supply pipe has a vent hole (not shown) opened at its front end side. The vent hole opens inside the 1 st balloon BL 1. The vent holes allow supply of gas to the 1 st balloon BL1 and suction of gas from the 1 st balloon BL 1. The first balloon BL1 is inflated by blowing air into the first balloon BL1 through the vent hole, and the first balloon BL1 is deflated by sucking air from the inside of the first balloon BL1 through the vent hole. The endoscope 14 including the 1 st balloon BL1 on the outer peripheral surface of the bending portion 46 is illustrated, but the endoscope 14 may not include the 1 st balloon BL 1.

Fig. 2 is an enlarged perspective view of the distal end portion 48 of the insertion portion 18. As shown in fig. 2, an observation window 52, a pair of illumination windows 54, an air/water supply nozzle 56, and a clamp passage 58 are provided on the distal end surface 50 of the distal end portion 48. An imaging element, not shown, is provided behind the observation window 52 in the front end portion 48. The observation image is imaged on the imaging element and is photoelectrically converted. A signal cable (not shown) is connected to the imaging element, and the signal cable is connected to the processor 30 via the insertion portion 18, the handheld operation portion 16, the universal cable 20, and the like described above. Therefore, an image pickup signal of the observation image photoelectrically converted by the imaging element is output to the processor 30, subjected to signal processing in the processor 30 as appropriate, and then output to the display 60 (see fig. 1). Thereby, the observation image is displayed on the display 60.

An ejection end of a light guide, not shown, is disposed behind the pair of illumination windows 54 in the distal end portion 48. The incident end of each light pipe is connected to a light source device 24. Thus, the illumination light supplied from the light source device 24 to the incident end of each light guide is irradiated to the region to be observed through the pair of illumination windows 54.

Returning to fig. 1, the outer tube 10 includes a tube body 70 and a grip cylinder 76 connected to a proximal end side of the tube body 70. The overtube 10 has a tubular structure for forming an endoscope insertion path 11 through which an insertion portion 18 of an endoscope 14 can be inserted. The inner surface of the overtube 10 forms an endoscope insertion passage 11. The endoscope insertion passage 11 of the overtube 10 has an inner diameter slightly larger than the outer diameter of the insertion portion 18. The endoscope insertion passage 11 allows the insertion portion 18 to advance and retreat inside the outer sleeve 10, and eases the operation by the fingers of the endoscope 14.

The hose main body 70 is formed in a cylindrical shape from various flexible materials. By configuring the tubular shape, the 1 st insertion path 71 is formed in the hose main body 70. The 1 st insertion path 71 constitutes a part of the endoscope insertion path 11. A 2 nd balloon BL2 made of various elastic bodies is provided on the outer peripheral surface of the distal end side of the hose main body 70.

The grip cylinder 76 connected to the proximal end side of the hose main body 70 is formed into a cylindrical shape from various hard materials. By forming the cylindrical shape, the 2 nd insertion path 77 is formed in the grip cylindrical body 76. The 2 nd insertion path 77 constitutes the other part of the endoscope insertion path 11. The grip cylinder 76 has a central axis a. The central axis a is an imaginary axis extending in the longitudinal direction of the grip cylinder 76 and passing through the center of the 2 nd insertion path 77.

The grip cylinder 76 includes a 1 st connection tube 84 extending obliquely outward from the 1 st position P1 of the grip cylinder side 78 between the base end and the tip end of the grip cylinder 76 toward the base end of the grip cylinder 76. As will be described later, the 1 st connecting pipe 84 is formed in a cylindrical shape. The 1 st connection pipe 84 has a gas pipe 91 (refer to fig. 3) communicating with the gas supply pipe 12. The inner surface of the 1 st connection pipe 84 forms a gas line 91. The 1 st connection tube 84 is connected to the balloon control device 100 via a hose 106.

The grip cylinder 76 includes a 2 nd connection tube 86 extending obliquely outward from a 2 nd position P2 of the grip cylinder side 78, which is different from the 1 st position P1, toward the base end of the grip cylinder 76. Unless the 1 st position P1 and the 2 nd position P2 completely coincide, the 1 st position P1 and the 2 nd position P2 become different positions. As will be described later, the 2 nd connecting pipe 86 is formed in a cylindrical shape. The 2 nd connection pipe 86 has a liquid pipe 92 (refer to fig. 3) communicating with the 2 nd insertion path 77. The inner surface of the 2 nd connection pipe 86 forms a liquid line 92. Although not shown, a lubricant supply unit such as a syringe is connected to the 2 nd connection pipe 86.

The grip cylinder 76 is an integrally formed body in which the 1 st connection pipe 84 and the 2 nd connection pipe 86 are integrally formed. The integral molding means that a product (molded body) is integrally molded at the same time with joining of parts without using secondary adhesion or mechanical joining according to japanese industrial standard jis k-7010.

The grip cylinder side 78 preferably has a flange-like stopper 79 extending outward from the inside in the radial direction of the center axis a of the grip cylinder 76. The flange shape indicates a shape in which the outer peripheral surface of the grip cylinder side portion 78 of the grip cylinder 76 protrudes. The 1 st position P1 and the 2 nd position P2 are located on the surface of the stopper 79 on the proximal end side. As described later, the stopper 79 is in contact with the guard teeth. The stopper 79 and the guard teeth fix the position of the outer tube relative to the subject. The stopper 79 also reinforces the 1 st connection tube 84 extending from the 1 st position P1 and the 2 nd connection tube 86 extending from the 2 nd position P2. Since the stopper 79 is thick at the root of the 1 st connection pipe 84 and the 2 nd connection pipe 86, the breakage resistance of the 1 st connection pipe 84 and the 2 nd connection pipe 86 is improved.

The outer sleeve 10 is described with reference to fig. 3 and 4. Fig. 3 is a cross-sectional view taken along the central axis a of the grip cylinder 76 and along a cut line passing through the 1 st connection pipe 84 and the 2 nd connection pipe 86. Fig. 4 is a view of the outer tube 10 viewed from the proximal end side along the center axis a. As described above, the grip cylinder 76 includes the 2 nd insertion path 77, the stopper 79, and the 1 st connection pipe 84 and the 2 nd connection pipe 86 extending outward from the grip cylinder side portion 78.

As shown in fig. 3, the outer tube 10 includes an air supply pipe 12 communicating with the 2 nd balloon BL 2. The air supply pipe 12 is provided in parallel with the endoscope insertion passage 11 from the hose main body 70 to the grip cylinder 76. The 2 nd balloon BL2 is inflated by blowing air into the interior of the 2 nd balloon BL2 through the air supply pipe 12. The 2 nd balloon BL2 is deflated by sucking air inside the 2 nd balloon BL2 through the air supply line 12.

The 1 st connection pipe 84 has a gas pipe 91 communicating with the supply gas pipe 12. The grip cylinder side portion 78 preferably has a relay pipe 82 that constitutes a part of the air supply pipe 12 and communicates with the gas pipe 91. The relay line 82 communicates with the gas line 91. The air supply pipe 12 includes a part of the pipe 70A formed between the outer peripheral surface and the inner peripheral surface of the hose body 70, a part of the pipe 76A formed inside the grip cylinder 76, and a relay pipe 82 formed on the side portion 78 of the grip cylinder.

The gas line 91 and the relay line 82 are preferably connected to each other by bending. The bent connection means that the gas line 91 and the relay line 82 are not straight and are bent. This bent connection allows selection of the direction in which the gas pipe 91 extends, without being affected by the direction in which the relay pipe 82 extends. Therefore, the direction of the 1 st connection pipe 84 forming the gas pipe 91 can be freely selected, and thus the grip cylinder 76 can secure a degree of freedom in design.

The gas pipe line 91 is preferably inclined obliquely outward toward the base end side of the grip cylinder 76 with respect to the intermediate pipe line 82. The 1 st connection pipe 84 having the gas pipe 91 is inclined outward, so that the medical practitioner can easily hold the grip cylinder 76. The oblique outward inclination means that when an extension line extending the relay pipe 82 to the base end side is compared with the gas pipe 91, the gas pipe 91 is located at a position gradually distant from the grip cylindrical body side portion 78 to the base end side than the extension line.

The 2 nd connection pipe 86 has a liquid pipe 92 communicating with the 2 nd insertion path 77. The liquid line 92 is a line for supplying lubricant such as water between the inner peripheral surface of the outer sleeve 10 and the outer peripheral surface of the insertion portion 18, not shown. For example, a lubricant such as water is supplied from a syringe connected to the 2 nd connection pipe 86 to the liquid pipe 92 via the 2 nd insertion path 77. The lubricant reduces friction between the outer tube 10 and the insertion portion 18 inserted through the outer tube 10. A liquid line 83 is formed inside the grip cylinder 76, and a liquid line 92 of the 2 nd connection pipe 86 communicates with the liquid line 83.

As shown in fig. 3, the 1 st position P1 and the 2 nd position P2 have a 1 st distance L1 from the 1 st position P1 longer than a 2 nd distance L2 from the 2 nd position P2 with respect to the central axis a, and have an equal distance L3 from the base end with respect to the base end of the grip cylinder 76. The 1 st position P1 and the 2 nd position P2 are arranged in parallel in the radial direction with the central axis A as a reference.

Next, the positional relationship between the 1 st position P1 and the 2 nd position P2 will be described with reference to fig. 5. Fig. 5 is a diagram for explaining the relationship between the 1 st position P1 and the 2 nd position P2 in the 1 st configuration of embodiment 1. Fig. 5 is a view of the outer tube 10 viewed from the base end side along the center axis a, with the 1 st connection tube 84 and the 2 nd connection tube 86 removed. The 1 st position P1 and the 2 nd position P2 are located on the proximal end side of the stopper 79 of the grip cylinder 76. The 1 st position P1 and the 2 nd position P2 are concepts for indicating a site. Therefore, although there is no particular limitation on the size, shape, and the like, fig. 5 shows the 1 st position P1 and the 2 nd position P2 including the sizes of the relay line 82 and the liquid line 92. Also, in fig. 5, the air feed pipe 12 is shown.

As shown in fig. 5, in the 1 st position P1 and the 2 nd position P2, when a plane orthogonal to the central axis of the grip cylinder 76 is defined as the 1 st surface PL1 and a plane orthogonal to the 1 st surface PL1 and intersecting the air supply duct 12 is defined as the 2 nd surface PL2, the 1 st position P1 and the 2 nd position P2 are disposed on the same side with respect to the reference plane RP orthogonal to the 1 st surface PL1 and orthogonal to the 2 nd surface PL 2. The 1 st position P1 and the 2 nd position P2 are arranged on the one outer peripheral surface side of the grip cylinder 76 with respect to the reference surface RP. By disposing the 1 st position P1 and the 2 nd position P2 on the same side, the 1 st position P1 and the 2 nd position P2 can be brought closer. By bringing the 1 st position P1 and the 2 nd position P2 closer to each other, the 1 st connection tube 84 extending outward from the 1 st position P1 and the 2 nd connection tube 86 extending outward from the 2 nd position P2 can be brought closer to each other, and the medical practitioner can easily grip the overtube 10.

In embodiment 1, the 2 nd surface PL2 intersecting the air supply pipe 12 defines the reference surface RP. The 2 nd plane PL2 can also define the reference plane R P when the air supply duct 12 is not aligned in the axial direction of the central axis a of the gripping cylinder 76 or is formed to be elongated in the circumferential direction of the gripping cylinder 76.

As shown in fig. 5, the 1 st position P1 and the 2 nd position P2 are preferably the same position in the circumferential direction of the center axis a of the grip cylinder 76. This structure can bring the 1 st position P1 and the 2 nd position P2 closest in the circumferential direction. The same positions mean that the 1 st position P1 and the 2 nd position P2 are located on the same straight line when the straight line is drawn in the outer circumferential direction from the center axis a. As shown in fig. 5, since the 1 st position P1 and the 2 nd position P2 are different in distance from the central axis a, the 2 nd position P2 and the 1 st position P1 are in a positional relationship of inward and outward in the radial direction with respect to the central axis a.

Fig. 6 and 7 are views for explaining the relationship between the 1 st position P1 and the 2 nd position P2 in the 2 nd configuration of embodiment 1. Fig. 6 is a side view of the grip cylinder 76 including the 1 st connection pipe 84 and the 2 nd connection pipe 86 as viewed from the side of the grip cylinder side portion 78. Fig. 7 is a view of the grip cylinder 76 of fig. 6 as viewed from the proximal end side along the center axis a.

In the 1 st position P1 and the 2 nd position P2 shown in fig. 6, the distance L4 from the 1 st position P1 is longer than the distance L5 from the 2 nd position P2 with respect to the base end of the grip cylinder 76. The distances L6 from the center axis a are equal with respect to the center axis a. The 1 st position P1 and the 2 nd position P2 are arranged in parallel in the longitudinal direction of the central axis A.

As shown in fig. 7, even when the 1 st position P1 and the 2 nd position P2 are arranged side by side along the central axis a, the 1 st position P1 and the 2 nd position P2 are arranged on the same side with respect to the reference plane RP. Similarly to the configuration 1, when a plane orthogonal to the central axis a of the grip cylinder 76 is a 1 st plane PL1 (not shown) and a plane orthogonal to the 1 st plane and intersecting the air supply duct 12 is a 2 nd plane PL2, the reference plane RP is a plane orthogonal to the 1 st plane PL1 and orthogonal to the 2 nd plane PL 2.

As shown in fig. 7, the 1 st position P1 and the 2 nd position P2 are preferably the same position in the circumferential direction (the direction indicated by the arrow) of the central axis a of the grip cylindrical body 76. This structure can bring the 1 st position P1 and the 2 nd position P2 closest in the circumferential direction. Since the 1 st position P1 and the 2 nd position P2 are different in distance from the base end of the grip cylinder 76, the 1 st position P1 and the 2 nd position P2 are in a far-near positional relationship with respect to the base end (see fig. 6).

Other modes of the positional relationship between the 1 st position P1 and the 2 nd position P2 will be described. Fig. 8 and 9 are views for explaining the positional relationship between the 1 st position P1 and the 2 nd position P2 in the 3 rd configuration of embodiment 1. Fig. 8 is a perspective view of the grip cylinder 76 including the 1 st connection pipe 84 and the 2 nd connection pipe 86 of the grip cylinder 76 as viewed from the proximal end side. Fig. 9 is a view of the grip cylinder 76 of fig. 8 as viewed from the proximal end side along the center axis a.

As shown in fig. 8, the grip cylinder 76 includes a 1 st connection tube 84 extending outward from the 1 st position P1, a 2 nd connection tube 86 extending outward from the 2 nd position P2, and a stopper 79. The stopper 79 is provided continuously over the entire outer circumference of the grip cylinder side 78.

As shown in fig. 8, the 1 st connection pipe 84 and the 2 nd connection pipe 86 are arranged in parallel in the circumferential direction of the grip cylinder 76 as indicated by arrows. As shown in fig. 8 and 9, the 1 st connection pipe 84 and the 2 nd connection pipe 86 are formed as an inseparable integrated body. In the 3 rd embodiment, there is no gap between the 1 st connection pipe 84 and the 2 nd connection pipe 86.

As shown in fig. 9, in the 3 rd configuration, the 1 st position P1 and the 2 nd position P2 are arranged on the same side with respect to the reference plane RP, as in the 1 st configuration and the 2 nd configuration. The practitioner can easily hold the grip cylinder 76.

Fig. 10 and 11 are views for explaining the positional relationship between the 1 st position P1 and the 2 nd position P2 in the 4 th configuration of embodiment 1. Fig. 10 is a perspective view of the grip cylinder 76 including the 1 st connection pipe 84 and the 2 nd connection pipe 86. Fig. 11 is a perspective view of the grip cylinder 76 of fig. 10 as viewed from the proximal end side.

As shown in fig. 10, the grip cylinder 76 includes a 1 st connection tube 84 extending outward from the 1 st position P1, a 2 nd connection tube 86 extending outward from the 2 nd position P2, and a stopper 79. The stopper 79 is provided continuously over the entire outer circumference of the grip cylinder side 78. As shown in fig. 11, the 1 st position P1 and the 2 nd position P2 are arranged in parallel in the circumferential direction of the central axis a as indicated by arrows.

As shown in fig. 10 and 11, the 4 th structure is different from the 3 rd structure in that the 1 st connection pipe 84 and the 2 nd connection pipe 86 are separately formed. In the 4 th configuration, as in the 1 st and 2 nd configurations, a gap is present between the 1 st and 2 nd connection pipes 84 and 86.

As shown in fig. 11, in the 4 th configuration, the 1 st position P1 and the 2 nd position P2 are disposed on the same side with respect to the reference plane RP as in the 1 st to 3 rd configurations. The practitioner can easily hold the grip cylinder 76.

Next, a preferred embodiment of embodiment 1 will be described. As shown in fig. 3, the angle θ 1 of the pipe axis 91A of the gas pipe 91 forming the 1 st connecting pipe 84 with respect to the reference plane RP is preferably 40 degrees or less.

As described above, the grip cylinder 76 is an integrally formed body in which the 1 st connection pipe 84 and the 2 nd connection pipe 86 are integrally formed. The integral molding is performed by using, for example, 2 molds having cavities (inner spaces). The integral molding process is performed by the following steps: (1) closing the 2 molds to form a cavity (internal space) in the shape of the grip cylinder 76 inside the mold; (2) filling the cavity with molten resin; (3) curing the resin; (4) and demolding the mold from the integrally molded body.

By setting the angle θ 1 of the pipe axis 91A of the gas pipe 91 to 40 degrees or less, the mold can be easily released from the integrally molded body, and molding of the gas pipe 91 becomes easy. Since the mold release can be easily performed by setting the angle θ 1 to 40 degrees or less, the breakage resistance of the grip cylinder 76, which is an integrally molded body, can be improved.

As shown in fig. 3, when the distance between the central axis a of the grip cylinder 76 and the 1 st position P1 is set to the 1 st distance L1 and the distance between the central axis a of the grip cylinder 76 and the 2 nd position P2 is set to the 2 nd distance L2, the 1 st distance L1 is preferably larger than the 2 nd distance L2.

By making the 1 st distance L1 longer than the 2 nd distance L2, the air supply pipe 12 can be extended from the grip cylinder 76 to the 2 nd balloon BL2 of the hose body 70. If the 2 nd distance L2 is longer than the 1 st distance L1, the liquid pipe 83 inside the grip cylinder 76 may prevent the air supply pipe 12 from extending to the 2 nd balloon BL 2.

By setting the 1 st position P1 and the 2 nd position P2 to the positional relationship described above, the 2 nd connecting tube 86 can be disposed between the 1 st connecting tube 84 and the grip cylinder 76.

Further, of the gas pipe line 91 of the 1 st connection pipe 84 and the liquid pipe line 92 of the 2 nd connection pipe 86 of the grip cylinder 76, the gas pipe line 91 is preferably disposed at a position further outside than the liquid pipe line 92 with respect to the central axis a.

Since the gas pipe line 91 of the grip cylinder 76 is located outside the liquid pipe line 92 with respect to the central axis a, the hose 106 from the device for supplying air into the 2 nd balloon BL2 can be located at a position that does not interfere with the grip cylinder 76 when the medical practitioner grips the grip cylinder 76.

The position outside the central axis a means that the gas pipe 91 is longer in distance from the central axis a than the liquid pipe 92.

Fig. 12 is a view of the grip cylinder 76 as viewed from the proximal end side along the center axis a. As shown in fig. 12, when the 1 st connection pipe 84 and the 2 nd connection pipe 86 are projected on a plane (not shown) orthogonal to the central axis a of the grip cylinder 76, at least a partial region of the 1 st connection pipe 84 and the 2 nd connection pipe 86 preferably overlap each other.

The 1 st and 2 nd connection pipes 84 and 86 have different physical sizes (here, the 1 st and 2 nd connection pipes 84 and 86 have different diameters) from each other at the 1 st and 2 nd positions P1 and P2. The 1 st connection pipe 84 and the 2 nd connection pipe 86 having physical dimensions can overlap each other at least in a partial region. This overlapping enables the 1 st connection pipe 84 and the 2 nd connection pipe 86 to be close to each other, and the grip cylinder 76 can be downsized. The size of the region where the 1 st connection pipe 84 and the 2 nd connection pipe 86 overlap each other varies depending on the size of the diameter of the 1 st connection pipe 84 and the 2 nd connection pipe 86.

Fig. 13 is a view showing a state in which the outer tube 10 is attached to the test subject PT through the mouth. As shown in fig. 13, the subject PT holds the tooth protector 94.

The guard teeth 94 are members that the test subject PT holds in, and are formed of resin into a cylindrical shape. A flange 94A is formed on one opening side of the guard tooth 94. The flange 94A prevents the subject PT from swallowing the guard tooth 94.

An insertion portion 18 (not shown) of the endoscope 14 is inserted into the endoscope insertion passage 11 of the overtube 10. The outer tube 10 is attached to the proximal end side of the insertion portion 18. The endoscope 14 with the overtube 10 attached thereto is inserted into the body cavity of the subject PT from the oral cavity via the tooth protector 94.

The stopper 79 of the grip cylinder 76 of the outer tube 10 comes into contact with the flange 94A of the guard tooth 94. The position of the outer tube 10 relative to the test subject PT is fixed by the contact of the stopper 79 with the guard teeth 94, thereby determining the length of the outer tube 10 inserted into the body cavity of the test subject PT. The distal end side is inserted into the body cavity of the subject PT from the 1 st position P1 and the 2 nd position P2 of the outer tube 10.

Fig. 13 illustrates a grip cylinder 76 provided with a stopper 79. When the grip cylinder 76 does not have the stopper 79, one of the 1 st connection pipe 84 extending from the 1 st position P1 or the 2 nd connection pipe 86 extending from the 2 nd position P2 is in contact with the flange 94A of the guard tooth 94. The contact of the 1 st connection tube 84 or the 2 nd connection tube 86 with the guard teeth 94 fixes the position of the outer socket 10 with respect to the test subject PT, thereby determining the length of the outer socket 10 inserted into the body cavity of the test subject PT.

As shown in fig. 13, the 1 st position P1 and the 2 nd position P2 are preferably arranged closer to the base end of the grip cylinder 76 than the distal end of the grip cylinder 76. By disposing the 1 st position P1 and the 2 nd position P2 on the proximal end side of the grip cylinder 76, the length of the outer tube 10 that can be inserted into the body cavity of the test subject PT can be increased.

[ 2 nd embodiment ]

The outer tube of embodiment 2 will be explained. The same components as those in embodiment 1 are denoted by the same reference numerals and description thereof may be omitted. The basic structure of embodiment 2 is the same as that of embodiment 1, and is a specific embodiment from another point of view. That is, the 1 st position and the 2 nd position can be specified regardless of the position of the air supply duct.

Fig. 14 is a view of the grip cylinder 76 as viewed from the proximal end side along the center axis a. As shown in fig. 14, the grip cylinder 76 includes a 1 st connection tube 84 extending from the 1 st position P1 of the grip cylinder side 78 toward the proximal end side, a 2 nd connection tube 86 extending from the 2 nd position P2 of the grip cylinder side 78 toward the proximal end side, and a 2 nd insertion path 77. The grip cylinder 76 is an integrally formed body in which the 1 st connection pipe 84 and the 2 nd connection pipe 86 are integrally formed.

The grip cylinder side 78 of the grip cylinder 76 preferably has a flange-like stopper 79 extending outward from the inside in the radial direction of the center axis a of the grip cylinder 76. The 1 st position P1 and the 2 nd position P2 are located on the surface of the stopper 79 on the proximal end side.

In the grip cylinder 76 according to embodiment 2, when viewed from the axial direction of the central axis a of the grip cylinder 76, an angle θ 2 formed by a 1 st straight line SL1 connecting the central axis a and the 1 st position P1 and a 2 nd straight line SL2 connecting the central axis a and the 2 nd position P2 is an acute angle or 0 degree. By setting the angle θ 2 to an acute angle or 0 degrees, the 1 st position P1 and the 2 nd position P2 can be arranged close to each other. The 1 st and 2 nd connecting pipes 84 and 86 can be arranged close to each other in the circumferential direction of the central axis a in the positional relationship between the 1 st and 2 nd positions P1 and P2. The practitioner can easily hold the grip cylinder 76. The angle θ 2 formed by the 1 st straight line SL1 and the 2 nd straight line SL2 is a small angle among 2 angles defined by the 1 st straight line SL1 and the 2 nd straight line SL 2. In embodiment 2, the 1 st position P1 and the 2 nd position P2 can be determined without being affected by the position of the air supply pipe 12 (not shown) of the outer tube 10.

In embodiment 2, the case where the 1 st position P1 and the 2 nd position P2 are juxtaposed in the circumferential direction of the central axis a is exemplified. Without being limited thereto, the arrangement of the 1 st position P1 and the 2 nd position P2 may be such that the distance from the base end of the grip cylinder 76 to the 1 st position P1 is different from the distance from the base end to the 2 nd position P2. In this case, when viewed from the axial direction of the central axis a of the grip cylinder 76, the angle θ 2 formed by the 1 st straight line SL1 connecting the central axis a and the 1 st position P1 and the 2 nd straight line SL2 connecting the central axis a and the 2 nd position P2 may be an acute angle or 0 degree.

In embodiment 2, the same preferable configurations and embodiments as those of embodiment 1 can be applied without departing from the scope of the invention.

[ embodiment 3 ]

The outer tube according to embodiment 3 will be explained. The same components as those in embodiment 1 and embodiment 2 are denoted by the same reference numerals, and description thereof may be omitted. In comparison between embodiment 3 and embodiments 1 and 2, the gripping cylinder of the outer tube includes a stopper, and the 1 st position and the 2 nd position are disposed between the stopper or the base end and the stopper. The length of the outer cannula of which the stopper is inserted into the body cavity of the subject is determined regardless of the 1 st position and the 2 nd position.

Fig. 15 is a side view of the grip cylinder 76 including the 1 st connection pipe 84 and the 2 nd connection pipe 86 as viewed from the side of the grip cylinder side portion 78. Fig. 16 is a perspective view of the grip cylinder including the 1 st connection pipe 84 and the 2 nd connection pipe 86 as viewed from the proximal end side of the grip cylinder 76.

As shown in fig. 15 and 16, the grip cylinder 76 includes a 1 st connection tube 84 extending from the 1 st position P1 of the grip cylinder side portion 78 toward the proximal end side, a 2 nd connection tube 86 extending from the 2 nd position P2 of the grip cylinder side portion 78 toward the proximal end side, and a 2 nd insertion path 77. The grip cylinder 76 is an integrally formed body in which the 1 st connection pipe 84 and the 2 nd connection pipe 86 are integrally formed.

The grip cylinder side 78 of the grip cylinder 76 has a flange-like stopper 79 extending outward from the inside in the radial direction of the center axis of the grip cylinder 76. The 1 st position P1 and the 2 nd position P2 are formed on the stopper 79. Fig. 15 and 16 illustrate a case where the 1 st position P1 and the 2 nd position P2 are formed in the stopper 79. However, the present invention is not limited to this configuration, and as shown in fig. 17, the 1 st position P1 and the 2 nd position P2 may be located between the proximal end of the grip cylinder 76 and the stopper 79.

Fig. 18 is a view showing a state in which the outer tube 10 according to embodiment 3 is attached to a subject PT through a mouth portion. As shown in fig. 18, the subject PT holds the tooth protector 94.

An insertion portion 18 (not shown) of the endoscope 14 is inserted into the endoscope insertion passage 11 of the overtube 10. The outer tube 10 is attached to the proximal end side of the insertion portion 18. The endoscope 14 with the overtube 10 attached thereto is inserted into the body cavity of the subject PT from the oral cavity via the tooth protector 94.

The stopper 79 of the grip cylinder 76 of the outer tube 10 comes into contact with the flange 94A of the guard tooth 94. The position of the outer tube 10 relative to the test subject PT is fixed by the contact of the stopper 79 with the guard teeth 94, thereby determining the length of the outer tube 10 inserted into the body cavity of the test subject PT.

By fixing the position of the overtube 10 by the stopper 79, the length of the overtube 10 that can be inserted into the body cavity of the test subject PT can be increased. The stopper 79 is preferably provided at a position closer to the base end than the front end of the grip cylinder 76.

In embodiment 3, the same preferred embodiments as those in embodiment 1 and embodiment 2 can be applied without departing from the scope of the invention.

Description of the symbols

1-endoscopic device, 10-outer cannula, 11-endoscopic insertion channel, 12-air supply channel, 14-endoscope, 16-handheld operation section, 18-insertion section, 20-universal cable, 21A-connector, 21B-connector, 24-light source device, 30-processor, 32-air/water supply button, 34-suction button, 36-shutter button, 38-corner button, 39-treatment instrument insertion section, 42-balloon air supply port, 44-flexible section, 46-curved section, 48-tip section, 50-tip section, 52-observation window, 54-illumination window, 56-air/water supply nozzle, 58-jaw port, 60-display, 70-hose body, 70A-channel, 71-1 st insertion path, 76-holding cylinder, 76A-line, 77-2 nd insertion path, 78-holding cylinder side, 79-stopper, 82-relay line, 84-1 st connection line, 86-2 nd connection line, 91-gas line, 91A-line axis, 92-liquid line, 94-tooth protector, 94A-flange, 100-balloon control device, 104-hose, 106-hose, A-center axis, BL 1-1 st balloon, BL 2-2 nd balloon, L1, L2, L3, L4, L5, L6-distance, LP 1-1 st distance, LP 2-2 nd distance, P1-1 st position, P2-2 nd position, PL 1-1 st surface, PL 2-2 nd surface, PT-tested person, RP-reference plane, SL 1-line 1, SL 2-line 2, theta 1, theta 2-angle.