JP2018134276A - Treatment instrument channel and endoscope - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a treatment instrument channel that enables a treatment instrument to smoothly advance from a treatment instrument insertion tube to a pipe member, and an endoscope.SOLUTION: A treatment instrument channel 100 includes a forceps pipe 58 and a tube 50 for treatment instrument insertion connected to the forceps pipe 58. The tube 50 for treatment instrument insertion includes a first region 52 formed on the tip side of the tube 50 for treatment instrument insertion, and a second region 54 formed on the base end side as compared with the first region 52. The first region 52 is a region where crush resistance is higher than in the second region 54, and the first region 52 is formed with a connection part 56 connected to the forceps pipe 58.SELECTED DRAWING: Figure 9

Description

  The present invention relates to a treatment instrument channel and an endoscope, and more particularly to a treatment instrument channel for inserting a treatment instrument and an endoscope including the treatment instrument channel.

  Conventionally, in the medical field, medical diagnosis using an endoscope has been performed. In medical diagnosis using an endoscope, an image sensor is incorporated in a hard distal end portion of an endoscope insertion portion (hereinafter referred to as an insertion portion) that is inserted into the body, and an image inside the body is photographed. For example, the tissue is collected by a treatment tool such as a puncture needle or a stent is placed.

  In such an endoscope, a treatment instrument having high bending rigidity has been used recently. The treatment instrument is inserted into the insertion portion from the treatment instrument insertion port, and is led out from the treatment instrument outlet. The treatment instrument insertion port is provided in the operation portion of the endoscope, and the treatment instrument outlet is provided in the distal end portion main body of the distal end hard portion.

  Patent Document 1 discloses a convex-type ultrasonic endoscope using a puncture needle. The operation portion of the ultrasonic endoscope is provided with a puncture needle insertion port, and the puncture needle insertion port has a proximal end of a flexible puncture needle insertion tube (corresponding to a treatment instrument insertion tube). The side is connected. The puncture needle insertion tube is inserted and arranged from the soft part of the insertion part to the bending part. A connecting portion is formed on the distal end side of the treatment instrument insertion tube, and this connecting portion is connected to the proximal end side of a connecting pipe (corresponding to a pipe member). The distal end side of the connecting pipe communicates with a lead-out port (corresponding to the treatment instrument lead-out port), and this lead-out port is provided in a tip block (corresponding to the tip hard body) of the tip part (corresponding to the tip hard part). ing.

  In general, the puncture needle is inserted from the treatment instrument insertion port together with the sheath while being inserted through the flexible sheath, and is led out from the treatment instrument outlet through the treatment instrument insertion tube and the pipe member. The bending rigidity of the sheath is lower than the bending rigidity of the puncture needle, but is governed by the rigidity of the puncture needle when the puncture needle is inserted. In the case of a puncture needle, it is called a treatment instrument including a sheath.

JP-A-2-21852

  By the way, in the ultrasonic endoscope disclosed in Patent Document 1, when the puncture needle is inserted in a form in which the insertion portion is bent toward the up side (upper side), that is, a so-called up-angle form, the following problems occur. It may occur in particular. The up-angle form refers to a form in which the insertion part is curved to the up side when the direction in which the treatment instrument is drawn by the ultrasonic transducer is the up side, which is orthogonal to the central axis of the insertion part.

  FIG. 20 is an enlarged cross-sectional view of a main part of the treatment instrument channel 206 in which the distal end side connection portion 202 of the treatment instrument insertion tube 200 is connected to the proximal end side of a forceps pipe 204 that is a pipe member. 20 shows a state where a puncture needle 208 having a high bending rigidity in an up-angle form is inserted into the treatment instrument insertion tube 200 together with the sheath 210.

  Here, the connecting portion 202 of the treatment instrument insertion tube 200 is the length from the distal end 200A of the treatment instrument insertion tube 200 to the proximal end 204A of the forceps pipe 204 in the central axis A direction of the treatment instrument insertion tube 200. The cylindrical part of B is pointed out.

  In the up-angle configuration, the central axis A of the treatment instrument insertion tube 200 in the vicinity of the connection portion 202 is greatly inclined with respect to the insertion direction C of the sheath 210, so that the distal end 210A of the sheath 210 is attached to the treatment instrument insertion tube 200. It contacts the inner peripheral part 200B. When the sheath 210 is advanced in the insertion direction C toward the forceps pipe 204 in this state, the distal end 210A advances while elastically deforming the inner peripheral portion 200B to the outside of the treatment instrument insertion tube 200. Then, when the distal end 210A reaches the proximal end 204A of the forceps pipe 204, the distal end 210A is caught by the proximal end 204A of the forceps pipe 204 as shown in FIG. Due to such a phenomenon, the treatment instrument channel of Patent Document 1 has a problem that the sheath 210 cannot be smoothly advanced toward the forceps pipe 204.

  Such a problem is not limited to the sheath 210, and it is considered that the same problem occurs when another treatment tool such as a forceps having high bending rigidity is inserted.

  The present invention has been made in view of such circumstances, and an object thereof is to provide a treatment instrument channel and an endoscope that can smoothly advance a treatment instrument from a treatment instrument insertion tube toward a pipe member. To do.

  In order to achieve the object of the present invention, a treatment instrument channel according to the present invention is attached to a distal end body of an endoscope insertion portion and communicates with a treatment instrument outlet provided in the distal end body. A treatment instrument insertion tube connected to the pipe member, and the treatment instrument insertion tube includes a first region formed on a distal end side of the treatment instrument insertion tube, and a proximal end side of the first region. The first region is a region having higher crushing resistance than the second region, and a connection portion connected to the pipe member is formed in the first region.

  According to the treatment instrument channel of the present invention, when the distal end of the treatment instrument inserted into the treatment instrument insertion tube comes into contact with the inner peripheral portion of the second region, the distal end of the treatment instrument becomes the inner periphery of the second region. The portion advances toward the first region while elastically deforming the portion outward. Then, when the distal end of the treatment instrument passes through the second region and comes into contact with the inner peripheral portion of the first region, the first region has higher crush resistance than the second region. It advances along the inner peripheral part of the 1st field where elastic deformation to the outside was controlled. Thereby, the front-end | tip of a treatment tool is guide | induced to a pipe member, without being hooked on the base end of a pipe member.

  Further, according to the treatment instrument channel of the present invention, the distal end of the treatment instrument inserted into the treatment instrument insertion tube directly contacts the inner peripheral portion of the first region without coming into contact with the inner peripheral portion of the second region. When in contact, the distal end of the treatment tool advances along the inner peripheral portion of the first region in which elastic deformation to the outside is suppressed. Thereby, the front-end | tip of a treatment tool is guide | induced to a pipe member, without being hooked on the base end of a pipe member.

  Therefore, according to the treatment instrument channel of the present invention, the treatment instrument can be smoothly advanced from the treatment instrument insertion tube toward the pipe member.

  According to one aspect of the present invention, in the state before the treatment instrument insertion tube is connected to the pipe member, the inner diameter of the connecting portion is smaller than the outer diameter of the pipe member, and the inner diameter of the connecting portion is the connecting portion of the first region. When the pipe member and the treatment instrument insertion tube are connected to each other, the inner diameter on the proximal side from the connection portion of the first region is the same as the inner diameter of the pipe member or It is preferable that the inner diameter of the pipe member be smaller.

  According to one aspect of the present invention, the connecting portion is pushed outward by the fitting of the pipe member, and is tightly fixed to the pipe member when the pipe member is completely inserted. At this time, since the inner diameter on the base end side from the connection portion of the first region is the same as the inner diameter of the pipe member or smaller than the inner diameter of the pipe member, it is ensured that the distal end of the treatment instrument is caught by the proximal end of the pipe member. Can be prevented.

  In one embodiment of the present invention, in a state before the connection portion is connected to the pipe member, the outer diameter of the connection portion is preferably formed to be larger than the outer diameter on the base end side from the connection portion in the first region. .

  According to one aspect of the present invention, the strength of the connection portion of the treatment instrument insertion tube can be increased.

  In one embodiment of the present invention, the treatment instrument insertion tube is provided with an outer pipe on the outer periphery of the connection portion, and the outer pipe extends from the connection portion to the proximal end side of the treatment instrument insertion tube. It is preferable that a part is formed.

  According to one aspect of the present invention, at least deformation of the connection portion in the first region can be suppressed by the outer pipe.

  In one aspect of the present invention, the second region is preferably formed on the proximal end side of the treatment instrument insertion tube rather than the outer pipe.

  According to the aspect of the present invention, the second region is smoothly curved without being restricted by the outer pipe during the angle configuration.

  According to one aspect of the present invention, in the state before the treatment instrument insertion tube is connected to the pipe member, the inner diameter of the connecting portion is smaller than the outer diameter of the pipe member, and the inner diameter of the connecting portion is the connecting portion of the first region. When the pipe member and the treatment instrument insertion tube are connected to each other, the inner diameter on the proximal side from the connection portion of the first region is the same as the inner diameter of the pipe member or In the state before the connection portion is connected to the pipe member, the outer diameter of the connection portion is formed to be larger than the outer diameter on the base end side from the connection portion of the first region, The treatment instrument insertion tube has an outer pipe on the outer periphery of the connection portion, and the outer pipe is formed with an extension portion extending from the connection portion to the proximal end side of the treatment instrument insertion tube. Adheres to the gap between the treatment part and the treatment instrument insertion tube It is preferred that but applied.

  According to one aspect of the present invention, the distal end of the treatment instrument can be reliably prevented from being caught by the proximal end of the pipe member, and the strength of the connection portion of the treatment instrument insertion tube can be increased. In the first region, at least the deformation of the connection portion can be suppressed by the outer pipe, and further, the application region to which the adhesive is applied can be reinforced in the first region.

  In one embodiment of the present invention, the adhesive is preferably extended from the gap to the proximal end side of the treatment instrument insertion tube.

  According to one aspect of the present invention, the treatment instrument insertion tube positioned on the proximal end side from the gap can be reinforced with the adhesive.

  In one aspect of the present invention, the second region is preferably formed on the proximal end side of the treatment instrument insertion tube rather than the outer pipe.

  According to the aspect of the present invention, the second region is smoothly curved without being restricted by the outer pipe during the angle configuration.

  According to one aspect of the present invention, in the state before the treatment instrument insertion tube is connected to the pipe member, the inner diameter of the connecting portion is smaller than the outer diameter of the pipe member, and the inner diameter of the connecting portion is the connecting portion of the first region. When the pipe member and the treatment instrument insertion tube are connected to each other, the inner diameter on the proximal side from the connection portion of the first region is the same as the inner diameter of the pipe member or In the state before the connection portion is connected to the pipe member, the outer diameter of the connection portion is formed to be larger than the outer diameter on the base end side from the connection portion of the first region, The treatment instrument insertion tube has an outer pipe on the outer periphery of the connection portion, and the outer pipe is formed with an extension portion extending from the connection portion to the proximal end side of the treatment instrument insertion tube. In close contact with the gap between the tube and the treatment instrument insertion tube Negatives, it is preferably provided are fitted on the outer peripheral portion of the treatment instrument insertion tube.

  According to one aspect of the present invention, the distal end of the treatment instrument can be reliably prevented from being caught by the proximal end of the pipe member, and the strength of the connection portion of the treatment instrument insertion tube can be increased. In the first region, at least the deformation of the connecting portion can be suppressed by the outer pipe, and further, the exterior region of the first region where the contact spring is sheathed can be reinforced.

  In one embodiment of the present invention, the contact spring is preferably extended from the gap to the proximal end side of the treatment instrument insertion tube.

  According to one aspect of the present invention, the treatment instrument insertion tube positioned on the proximal end side from the gap can be reinforced by the contact spring.

  In one aspect of the present invention, the second region is preferably formed on the proximal end side of the treatment instrument insertion tube rather than the outer pipe.

  According to the aspect of the present invention, the second region is smoothly curved without being restricted by the outer pipe during the angle configuration.

  In one aspect of the present invention, it is preferable that the boundary portion formed between the first region and the second region of the treatment instrument insertion tube is provided within a range in which a contact spring is sheathed.

  According to one aspect of the present invention, the boundary portion between the first region and the second region can be reinforced by the contact spring.

  In one aspect of the present invention, it is preferable that an annular protrusion that protrudes toward the outer periphery of the treatment instrument insertion tube is provided on the inner periphery of the extending portion of the outer pipe.

  According to one aspect of the present invention, since the treatment instrument insertion tube is in contact with and supported by the protruding portion in the angle configuration, excessive deformation of the treatment instrument insertion tube can be suppressed.

  In one aspect of the present invention, the endoscope insertion portion includes a flexible portion, a bending portion, and a distal end portion main body from the proximal end side toward the distal end side, and a first region and a second region of the treatment instrument insertion tube, It is preferable that the boundary part formed between is formed at a position on the distal end side of the bending part in the direction from the distal end to the proximal end of the treatment instrument insertion tube.

  According to one aspect of the present invention, since the boundary portion between the first region and the second region is formed at the position on the distal end side of the bending portion, the bending portion can be smoothly bent.

  In order to achieve the object of the present invention, the endoscope of the present invention includes the treatment instrument channel of the endoscope of the present invention.

  According to the endoscope of the present invention, the treatment instrument can be smoothly advanced from the treatment instrument insertion tube toward the pipe member.

  According to the present invention, the treatment instrument can be smoothly advanced from the treatment instrument insertion tube toward the pipe member.

The whole perspective view of the ultrasonic inspection system which has the ultrasonic endoscope provided with the treatment tool channel of this embodiment. Schematic showing the overall configuration of the ultrasonic inspection system of FIG. The principal part expanded sectional view which showed the non-angle form of the insertion part shown in FIG. Perspective view of the hard tip of an ultrasonic endoscope Plan view of the hard tip of an ultrasonic endoscope Side view of the hard tip of an ultrasonic endoscope Front view of the hard tip of an ultrasonic endoscope The principal part expanded sectional view of the treatment tool channel which concerns on 1st Embodiment. Explanatory drawing which showed the state by which the sheath was inserted in the treatment instrument penetration tube by the up angle form The perspective view which expanded and showed the front end side of the treatment instrument penetration tube and the base end side of a forceps pipe Explanatory drawing where the boundary is located within the range of the axial length of the connecting pipe Explanatory drawing which shows the structure of the treatment tool channel which formed the boundary part in the position of the front end side of a bending part The principal part expanded sectional view which shows the 1st modification of the treatment tool channel of 1st Embodiment. The principal part expanded sectional view which shows the 2nd modification of the treatment tool channel of 1st Embodiment. The principal part expanded sectional view of the treatment tool channel of 2nd Embodiment. The principal part expanded sectional view of the treatment tool channel of 3rd Embodiment. The principal part expanded sectional view of the treatment tool channel of 4th Embodiment. The principal part expanded sectional view of the treatment tool channel of 5th Embodiment. The principal part expanded sectional view of the treatment tool channel of 6th Embodiment. The main part enlarged sectional view which inserted the puncture needle into the treatment instrument insertion tube with the sheath in an up-angle form

  Hereinafter, preferred embodiments of a treatment instrument channel and an endoscope according to the present invention will be described in detail with reference to the accompanying drawings.

  FIG. 1 is an overall perspective view showing an example of an ultrasonic inspection system 1, and shows an ultrasonic endoscope 10 provided with a treatment instrument channel of the present embodiment. FIG. 2 is a schematic diagram showing the overall configuration of the ultrasonic inspection system 1 shown in FIG.

  As shown in FIGS. 1 and 2, an ultrasonic inspection system 1 includes an ultrasonic endoscope 10 that captures an endoscopic image and an ultrasonic image inside the body, an ultrasonic processor unit 12 that generates an ultrasonic image, An endoscopic processor unit 14 that generates an endoscopic image, a light source device 16 that supplies illumination light for illuminating the inside of the body to the ultrasonic endoscope 10, and a monitor 18 that displays the endoscopic image and the ultrasonic image. And comprising.

  The ultrasonic endoscope 10 is a convex type ultrasonic endoscope, and includes an insertion portion 22 to be inserted into the body, an operation portion 24 connected to the proximal end of the insertion portion 22, and an operation portion 24. And a universal cord 26 having ends connected thereto. At the tip of the universal cord 26, a connector 28 connected to the ultrasonic processor unit 12, a connector 30 connected to the endoscope processor unit 14, and a connector 32 connected to the light source device 16 are provided. It has been. The ultrasonic endoscope 10 is detachably connected to the ultrasonic processor unit 12, the endoscope processor unit 14, and the light source device 16 through these connectors 28, 30, and 32.

  The ultrasonic processor unit 12, the endoscope processor unit 14, and the light source device 16 are loaded on a cart 20 with a caster as shown in FIG. A monitor 18 is attached to the pole 34 of the cart 20, and the monitor 18 is adjusted in the direction and height of the screen by a rotation mechanism and a height adjustment mechanism (not shown) provided on the pole 34. Is done.

  As shown in FIG. 2, the insertion portion 22 is configured by connecting a flexible portion 36, a bending portion 38, and a distal end hard portion 40 from the proximal end side toward the distal end side. The distal end hard portion 40 includes a distal end portion main body 42 made of a hard member, and the distal end portion main body 42 is provided with a treatment instrument outlet 44 (see FIG. 3).

  FIG. 3 is an enlarged cross-sectional view of a main part showing a non-angle form of the insertion portion 22 shown in FIG. In addition, the non-angle state refers to a state of the insertion portion 22 in which the bending portion 38 is not bent.

  The distal end portion of the bending portion 38 is connected to the proximal end portion of the distal end portion main body 42. The bending portion 38 is constituted by a plurality of node rings 46. The plurality of node rings 46 are arranged along the central axis D of the insertion portion 22. Each node ring 46 is swingably connected to the adjacent node ring 46 via a pin 48. A node ring 46A (hereinafter referred to as a distal node ring) 46A located on the distal end side among the plurality of node rings 46 is connected to the proximal end portion of the distal end main body 42 via a pin 48A. All the node rings 46 including the tip node ring 46A are covered with a flexible jacket tube (not shown). Thereby, the bending part 38 is comprised so that bending is possible.

  A treatment instrument insertion tube 50 shown in FIG. 3 is inserted into the insertion portion 22 shown in FIG. The treatment instrument insertion tube 50 guides the puncture needle 208 inserted into the sheath 210 (see FIG. 20) to the treatment instrument outlet 44. The treatment instrument insertion tube 50 is formed of a flexible tube made of, for example, polytetrafluoroethylene. The treatment instrument insertion tube 50 includes a first region 52 formed on the distal end side of the treatment instrument insertion tube 50 and a second region 54 formed on the proximal side of the first region 52. The first area 52 and the second area 54 will be described later.

  The proximal end of the treatment instrument insertion tube 50 is connected to a treatment instrument insertion port 24a provided on the distal end side of the operation unit 24 of FIG. Further, as shown in FIG. 3, the distal end side connecting portion 56 of the treatment instrument insertion tube 50 is connected to the proximal end side of a forceps pipe 58 which is a pipe member. The forceps pipe 58 is connected to the treatment instrument outlet 44 with the distal end side of the forceps pipe 58 attached to the distal end body 42.

  Returning to FIG. 2, the operation unit 24 includes an angle knob 24b for bending the bending unit 38, a standing lever 24c for raising the stand 64 (see FIG. 3), a suction button 24d for performing a suction operation, An air / water supply button 24e for performing a water supply operation and a switching button 24f for switching an image displayed on the monitor 18 are provided.

  Next, the configuration of the distal end hard portion 40 of the ultrasonic endoscope 10 will be described with reference to FIGS.

  4 is a perspective view of the distal end rigid portion 40, FIG. 5 is a plan view of the distal end rigid portion 40, FIG. 6 is a side view of the distal end rigid portion 40, and FIG.

  An ultrasonic observation unit 60 and an endoscope observation unit 62 are provided in the distal end main body 42 of the distal rigid portion 40. The endoscope observation unit 62 is provided on the proximal end side of the ultrasonic observation unit 60, and the treatment instrument outlet 44 is provided in the endoscope observation unit 62.

  As shown in FIG. 3, the ultrasonic observation unit 60 includes an ultrasonic transducer 70 including an electroacoustic conversion unit 66 and a backing material 68.

  The electroacoustic transducer 66 is composed of a plurality of piezoelectric elements (not shown) arranged along the body central axis Z direction of the tip body 42. The plurality of piezoelectric elements has an observation surface 66a on the surface thereof for transmitting and receiving ultrasonic waves. An acoustic lens 72 that converges the ultrasonic waves is provided on the observation surface 66a. The backing material 68 is fixed to the surface opposite to the observation surface 66a.

  Each piezoelectric element of the electroacoustic transducer 66 is provided with an electrode (not shown), and the electrode is connected to the wiring connection part 74 via a flexible printed board (not shown). The wiring connection portion 74 is provided on the bottom surface of the backing material 68. A plurality of wirings 76 are connected to the wiring connection part 74, and the wirings 76 are wired to the wiring insertion holes 78 of the distal end portion main body 42 and a flexible pipe (not shown), so that the ultrasonic processor unit 12 of FIG. Connected to. According to the ultrasonic observation unit 60 configured as described above, each piezoelectric element of the electroacoustic conversion unit 66 is sequentially driven by the ultrasonic processor unit 12 so that ultrasonic electronic scanning can be performed.

  As shown in FIGS. 4 and 5, the endoscope observation unit 62 includes an observation optical system 80, illumination optical systems 82 and 84, and an image sensor (not shown).

  In the distal end portion main body 42, inclined surfaces 86 a and 86 b that are inclined at a predetermined angle toward the base end side with respect to a plane orthogonal to the main body central axis Z are provided on the left and right sides of the treatment instrument outlet 44. An observation window 80a of the observation optical system 80 and an illumination window 82a of one illumination optical system 82 are provided on the left inclined surface 86a from the proximal end side to the distal end side of the distal end main body 42. An illumination window 84a of the other illumination optical system 84 is provided on the right inclined surface 86b from the proximal end side of the distal end portion main body 42 toward the distal end side.

  The observation optical system 80 includes an optical system member (not shown) that takes in light from the subject in the observation visual field range from the observation window 80 a and forms a subject image inside the distal end hard portion 40. An imaging element (not shown) that captures a subject image formed by the observation optical system 80 and generates an imaging signal is disposed inside the distal end hard portion 40. The image sensor is driven and controlled by the endoscope processor unit 14 shown in FIG. The endoscope processor unit 14 acquires an imaging signal transmitted from the imaging device, and performs various signal processing to generate a video signal for an endoscope image.

  The illumination optical systems 82 and 84 are optical system members that emit illumination light transmitted from the light source device 16 (see FIG. 2) via a light guide (not shown) to the observation visual field range via the illumination windows 82a and 84a. Is provided. A cleaning nozzle 88 that ejects liquid or gas toward the observation window 80a is provided in the vicinity of the observation window 80a on the inclined surface 86a.

  The treatment instrument outlet 44 is provided on the proximal side with respect to the ultrasonic observation unit 60. The treatment instrument outlet 44 communicates with a recessed upright stand accommodating portion 90. In the stand support section 90, a stand 64 that changes the lead-out direction of the sheath 210 (see FIG. 20) is rotatably provided. The stand 64 is reciprocated between the lying position and the standing position by operating the standing lever 24c shown in FIG. In the present embodiment, the treatment instrument including the puncture needle 208 and the sheath 210 is exemplified, but the present invention is not limited to this, and other treatment instruments such as forceps may be used.

  Next, an embodiment of a treatment instrument channel according to the present invention will be described.

  FIG. 8 is an enlarged cross-sectional view of the distal end side of the treatment instrument insertion tube 50 shown in FIG. 3, and is an enlarged cross-sectional view of a main part of the treatment instrument channel 100 according to the first embodiment.

  As shown in FIG. 8, the treatment instrument channel 100 includes a forceps pipe 58 and a treatment instrument insertion tube 50 connected to the forceps pipe 58. The treatment instrument insertion tube 50 has a first region 52 formed on the distal end side of the treatment instrument insertion tube 50 and a second region 54 formed on the proximal side of the first region 52. The first region 52 is a region having higher crush resistance than the second region 54, and a connection portion 56 connected to the forceps pipe 58 is formed in the first region 52. The connecting portion 56 of the treatment instrument insertion tube 50 is a length B from the distal end 50A of the treatment instrument insertion tube 50 to the proximal end 58A of the forceps pipe 58 in the central axis A direction of the treatment instrument insertion tube 50. The cylindrical part of

  The first region 52 of the embodiment is configured in a solid structure by making the firing temperature higher or the firing time longer than the second region 54 when the treatment instrument insertion tube 50 is manufactured. As a result, the first region 52 is a region having higher crush resistance than the second region 54.

  Regarding the second region 54, all regions except the first region 52 may be set as the second region in the entire length of the treatment instrument insertion tube 50. In addition, a region inserted and arranged in the insertion unit 22 excluding a region inserted in the operation unit 24 may be set as the second region. Furthermore, a region that is inserted and arranged in the insertion portion 22 excluding a region on the proximal end side of the insertion portion 22 may be set as the second region. Since the second region 54 has lower crush resistance than the first region 52, in other words, it is softer than the first region 52, and thus does not affect the flexibility of the insertion portion 22.

  FIG. 9 is an explanatory view showing a state in which a puncture needle 208 having an up-angle configuration and high bending rigidity is inserted into the treatment instrument insertion tube 50 together with the sheath 210. According to FIG. 9, the sheath 210 is inserted into the treatment instrument insertion tube 50 along the insertion direction C.

  According to the treatment instrument channel 100 of the first embodiment, when the distal end 210A of the sheath 210 abuts on the inner peripheral portion 54A of the second region 54, the distal end 210A of the sheath 210 becomes the inner peripheral portion 54A of the second region 54. It advances toward the 1st field 52, making it elastically deform outside. Then, when the distal end 210A of the sheath 210 passes through the second region 54 and comes into contact with the inner peripheral portion 52A of the first region 52, the first region 52 has higher crush resistance than the second region 54. The distal end 210A of the sheath 210 advances along the inner peripheral portion 52A of the first region 52 in which elastic deformation to the outside is suppressed. As a result, the distal end 210A of the sheath 210 is smoothly guided to the forceps pipe 58 without being caught by the proximal end 58A of the forceps pipe 58 as shown by the solid line in FIG.

  Further, according to the treatment instrument channel 100 of the first embodiment, the distal end 210A of the sheath 210 directly contacts the inner peripheral portion 52A of the first region 52 without contacting the inner peripheral portion 54A of the second region 54. In this case, the distal end 210A of the sheath 210 advances along the inner peripheral portion 52A of the first region 52 in which the outward elastic deformation is suppressed. As a result, the distal end 210A of the sheath 210 is smoothly guided to the forceps pipe 58 without being caught by the proximal end 58A of the forceps pipe 58 as shown by the solid line in FIG.

  Therefore, according to the treatment instrument channel 100 of the first embodiment, the distal end 210A of the sheath 210 is connected to the inner peripheral portion of the treatment instrument insertion tube 50 (the inner peripheral portion 54A of the second region 54 and the inner peripheral portion of the first region 52). 52A), the sheath 210 can be smoothly advanced from the treatment instrument insertion tube 50 toward the forceps pipe 58.

  FIG. 10 is an enlarged perspective view showing the distal end side of the treatment instrument insertion tube 50 and the proximal end side of the forceps pipe 58.

  As shown in FIG. 10, in the state before the treatment instrument insertion tube 50 is connected to the forceps pipe 58, the inner diameter 56Di (diameter inside) of the connection portion 56 is smaller than the outer diameter 58Do (diameter outside) of the forceps pipe 58. It is formed. Further, the inner diameter 56Di of the connection portion 56 is formed larger than the inner diameter 52Di on the proximal end side with respect to the connection portion 56 of the first region 52.

  Further, as shown in FIG. 8, in the state where the forceps pipe 58 and the treatment instrument insertion tube 50 are connected, the inner diameter 56Di on the proximal side from the connection portion 56 of the first region 52 is the same as the inner diameter 58Di of the forceps pipe 58. It is formed smaller than the diameter or inner diameter 58Di of the forceps pipe 58.

  With the above configuration, according to the treatment instrument channel 100 of the first embodiment, as shown in FIG. 10, the inner diameter 56Di of the connection portion 56 and the outer diameter 58Do of the forceps pipe 58 are in a relationship of 56Di <58Do. 56 is expanded by the insertion of the forceps pipe 58, and is firmly fixed to the forceps pipe 58 when the forceps pipe 58 is completely inserted. At this time, the inner diameter 52Di (see FIG. 8) on the proximal side of the connection portion 56 of the first region 52 is the same as or smaller than the inner diameter 58Di of the forceps pipe 58. Thereby, it is possible to reliably prevent the distal end 210A of the sheath 210 (see FIG. 9) from being caught by the proximal end 58A of the forceps pipe 58.

  Further, in the treatment instrument channel 100 of the first embodiment, the outer diameter 56Do of the connection portion 56 is the connection portion of the first region 52 in a state before the connection portion 56 is connected to the forceps pipe 58 as shown in FIG. It is formed larger than the outer diameter 52Do on the base end side from 56.

  With the above configuration, according to the treatment instrument channel 100 of the first embodiment, the thickness of the connection portion 56 ((56Do−56Di) / 2) can be increased, so that the strength of the connection portion 56 can be increased. it can.

  Moreover, the treatment instrument channel 100 of the first embodiment includes an outer pipe 102 as shown in FIG. The outer pipe 102 is externally mounted on the outer peripheral portion of the connection portion 56. Further, the outer pipe 102 is formed with an extending portion 104 extending from the connecting portion 56 to the proximal end side of the treatment instrument insertion tube 50. That is, the outer pipe 102 has a length E that reliably covers the connection portion 56 having a length B.

  With the above configuration, according to the treatment instrument channel 100 of the first embodiment, at least the connection portion 56 in the first region 52 can be protected and reinforced by the outer pipe 102. The connecting portion 56 is a portion that is deformed when the angle shown in FIG. 9 is formed, but the deformation of the connecting portion 56 can be suppressed by the outer pipe 102. Thereby, since the stress which generate | occur | produces in the connection part 56 by deformation | transformation of the connection part 56 can be reduced, the service life of the treatment instrument insertion tube 50 is extended. Further, in the form in which the connecting portion 56 and the outer pipe 102 are fixed by an adhesive (not shown), the deformation of the connecting portion 56 due to the peeling of the adhesive can be prevented.

  In the treatment instrument channel 100 of the first embodiment, as shown in FIG. 8, a second region 54 is formed on the proximal end side of the treatment instrument insertion tube 50 with respect to the outer pipe 102.

  With the above configuration, according to the treatment instrument channel 100 of the first embodiment, the second region 54 is smoothly curved without being restricted by the outer pipe 102 in the angle configuration shown in FIG. 9.

  In the treatment instrument channel 100 of the first embodiment, as shown in FIG. 8, a contact spring 108 is provided in the gap 106 between the extending portion 104 of the outer pipe 102 and the treatment instrument insertion tube 50. The contact spring 108 is provided in the gap 106 by being sheathed on the outer peripheral portion of the treatment instrument insertion tube 50.

  With the configuration described above, according to the treatment instrument channel 100 of the first embodiment, the gap region 110 located in the gap 106 in the first region 52 can be protected and reinforced by the contact spring 108. The gap area 110 is an area corresponding to the length of the gap 106 in the direction of the central axis A of the treatment instrument insertion tube 50. The gap region 110 is a portion that is deformed in the angle configuration shown in FIG. 9, but the deformation of the gap region 110 can be suppressed by the contact spring 108. Thereby, since the stress generated in the gap region 110 due to the deformation of the gap region 110 can be reduced, the service life of the treatment instrument insertion tube 50 is extended.

  Further, in the treatment instrument channel 100 of the first embodiment, the contact spring 108 extends from the gap 106 to the proximal end side of the treatment instrument insertion tube 50.

  With the above configuration, according to the treatment instrument channel 100 of the first embodiment, the treatment instrument insertion tube 50 positioned on the proximal end side from the gap 106 can be reinforced by the contact spring 108. In this case, the proximal end side of the contact spring 108 is inserted into the bending portion 38 as shown in FIG. 3, but the contact spring 108 has flexibility, so that the bending portion is not restricted by the contact spring 108. 38 bends flexibly.

  Further, the treatment instrument insertion tube 50 has a boundary portion 112 formed between the first region 52 and the second region 54 as shown in FIG. This boundary portion 112 is provided in a range in which the contact spring 108 is sheathed in a range in the direction of the central axis A of the treatment instrument insertion tube 50.

  With the configuration described above, according to the treatment instrument channel 100 of the first embodiment, the boundary 112 can be reinforced by the contact spring 108, so that deformation of the boundary 112 during the angle configuration is suppressed by the contact spring 108. Can do. Thereby, since the stress which generate | occur | produces in the boundary part 112 by deformation | transformation of the boundary part 112 can be reduced, the service life of the treatment instrument insertion tube 50 is extended.

  In addition, an annular protrusion 114 protruding toward the outer periphery of the treatment instrument insertion tube 50 is provided on the inner periphery of the extending portion 104 of the outer pipe 102.

  With the above-described configuration, according to the treatment instrument channel 100 of the first embodiment, the outer peripheral portion of the treatment instrument insertion tube 50 is in contact with and supported by the protrusion 114 in the angle configuration shown in FIG. Thereby, since excessive deformation of the treatment instrument insertion tube 50 can be suppressed, the service life of the treatment instrument insertion tube 50 is extended.

  Next, the preferable formation position of the boundary part 112 formed between the 1st area | region 52 and the 2nd area | region 54 is demonstrated with reference to FIG. 11, FIG.

  In FIG. 11, the connecting tube 116 is disposed between the distal end body 42 and the distal node ring 46 </ b> A, and the boundary portion 112 of the treatment instrument insertion tube 50 is formed within the axial length range F of the connecting tube 116. It is explanatory drawing which shows a structure. FIG. 11 also shows a graph showing the change in hardness of the treatment instrument insertion tube 50 in the direction from the distal end 50A of the treatment instrument insertion tube 50 to the proximal end. Here, the hardness of the treatment instrument insertion tube 50 is equivalent to the high crush resistance of the treatment instrument insertion tube 50.

  There are the following two forms of changes in the hardness of the treatment instrument insertion tube 50. That is, the first form is a form in which the hardness gradually decreases along the direction from the distal end 50A of the treatment instrument insertion tube 50 toward the proximal end, as indicated by a line A in the graph of FIG. Further, as shown by the line B of the graph, the second form is a form in which the hardness sharply decreases at one point in the direction from the distal end 50A of the treatment instrument insertion tube 50 toward the proximal end. In the case of the first form, the range of the wide area G where the hardness gradually changes is the boundary part 112, and in the case of the second form, the range of the very narrow area H where the hardness sharply decreases is the boundary part 112. It becomes.

  The boundary 112 is preferably formed on the distal end side of the treatment instrument insertion tube 50 rather than the position of the distal node ring 46A so as not to hinder the bending operation of the bending portion 38. Therefore, in the structure of the treatment instrument channel in FIG. 11, the connecting pipe 116 is connected to the proximal end side of the distal end body 42, and the boundary portion 112 is formed in the range F of the axial length of the connecting pipe 116.

  However, in the structure of the treatment instrument channel in FIG. 11, the distal end main body 42 and the connecting tube 116 constitute a distal end hard portion. For this reason, the length of the distal end hard portion (the length of the insertion portion 22 in the direction of the central axis D) is increased by the axial length of the connecting tube 116, and the distal end hard portion is undesirably enlarged. In addition, when the distal end hard portion is reduced in size by removing the connecting tube 116, the boundary portion 112 is formed on the proximal end side from the distal end portion main body 42, and thus the bending operation of the bending portion 38 is hindered.

  That is, when the treatment instrument insertion tube 50 having the boundary portion 112 is used for an endoscope, a structure capable of smoothly performing the bending operation of the bending portion while reducing the size of the distal end hard portion is treated. It is necessary to prepare for the material channel.

  Therefore, the treatment instrument channel 100 according to the first embodiment has a structure capable of smoothly performing the bending operation of the bending portion 38 while reducing the size of the distal end hard portion 40. An example of the specific structure is shown in FIG.

  The treatment instrument channel 100 of FIG. 12 does not have the connecting tube 116 of FIG. In the treatment instrument channel 100 of FIG. 12, a boundary portion 112 is formed at a position on the distal end side of the bending portion 38 in the direction from the distal end 50A of the treatment instrument insertion tube 50 to the proximal end.

  FIG. 12 also shows graphs of the third and fourth embodiments showing the change in hardness of the treatment instrument insertion tube 50 in the direction from the distal end 50A of the treatment instrument insertion tube 50 toward the proximal end. The third form is a form in which the hardness gradually decreases along the direction from the distal end 50A to the proximal end of the treatment instrument insertion tube 50 as indicated by a line C in the graph of FIG. Further, the fourth form is a form in which the hardness sharply decreases at one point in the direction from the distal end 50A of the treatment instrument insertion tube 50 to the proximal end, as indicated by a line D of the graph. In the case of the third embodiment, the range of the wide region I where the hardness gradually changes is the boundary portion 112, and in the case of the fourth embodiment, the range of the very narrow region J where the hardness sharply decreases is the boundary portion 112. It becomes.

  In the third embodiment, it is preferable to arrange the region I of the boundary portion 112 as far as possible from the distal end side of the bending portion 38. Similarly, in the fourth embodiment, it is preferable to arrange the region J of the boundary portion 112 as close to the distal end side of the curved portion 38 as possible.

  With the above-described structure, according to the treatment instrument channel 100 of the first embodiment, the boundary portion 112 is formed at the position on the distal end side of the bending portion 38 without the connection pipe 116 of FIG. It is possible to smoothly bend the bending portion 38 while reducing the size.

  Although the treatment instrument channel 100 of the first embodiment has been described above, the treatment instrument channel 100 of the first embodiment includes modifications shown in FIGS. 13 and 14 below. FIG. 13 shows an enlarged cross-sectional view of a main part of a treatment instrument channel 118 which is a first modification of the treatment instrument channel 100, and FIG. 14 shows a treatment instrument channel 120 which is a second modification of the treatment instrument channel 100. The principal part expanded sectional view of is shown.

  The difference between the treatment instrument channel 118 of FIG. 13 and the treatment instrument channel 100 (see FIG. 8) will be described. The outer pipe 102 is not provided with the projection 114, and the extension 104 and the treatment instrument insertion tube are provided. A short contact spring 108 </ b> A is provided only in the gap 106 with respect to 50. According to the treatment instrument channel 118 of FIG. 13, only the gap region 110 of the treatment instrument insertion tube 50 can be protected and reinforced by the contact spring 108A.

  The difference between the treatment instrument channel 100 in FIG. 14 and the treatment instrument channel 100 (see FIG. 8) is that the outer pipe 102 is not provided with the protrusion 114. According to the treatment instrument channel 120 of FIG. 14, the gap region 110 can be protected and reinforced only by the contact spring 108.

  Hereinafter, other embodiments of the treatment instrument channel according to the present invention will be described with reference to FIGS. 15 to 19.

  FIG. 15 is an enlarged cross-sectional view of a main part of the treatment instrument channel 122 of the second embodiment. In the description of the treatment instrument channel 122, the same or similar members as those of the treatment instrument channel 100 of the first embodiment shown in FIG.

  The treatment instrument insertion tube 124 of the treatment instrument channel 122 includes a first region 126 formed on the distal end side of the treatment instrument insertion tube 124 and a second region 128 formed on the proximal side of the first region 126. have. The first region 126 is a region having higher crush resistance than the second region 128, and the connection portion 130 connected to the forceps pipe 58 is formed in the first region 126.

  In the state before the treatment instrument insertion tube 124 is connected to the forceps pipe 58, the inner diameter 124Di and the outer diameter 124Do are uniform in the entire length of the treatment instrument insertion tube 124. Further, the inner diameter 124Di of the treatment instrument insertion tube 124 is formed smaller than the outer diameter 58Do of the forceps pipe 58. As a result, the connecting portion 130 is pushed outward by the insertion of the forceps pipe 58 and is tightly fixed to the forceps pipe 58 when the forceps pipe 58 is completely inserted.

  Also in the treatment instrument channel 122 of the second embodiment, since the first region 126 is formed on the distal end side of the treatment instrument insertion tube 124, the same effect as the treatment instrument channel 100 of the first embodiment, that is, treatment The treatment instrument can be smoothly advanced from the instrument insertion tube 124 toward the forceps pipe 58.

  FIG. 16 is an enlarged cross-sectional view of a main part of the treatment instrument channel 132 of the third embodiment. In the description of the treatment instrument channel 132, the same or similar members as those of the treatment instrument channel 100 of the first embodiment shown in FIG.

  The treatment instrument insertion tube 134 of the treatment instrument channel 132 includes a first region 136 formed on the distal end side of the treatment instrument insertion tube 134, and a second region 138 formed on the proximal end side of the first region 136. have. The first region 136 is a region having higher crush resistance than the second region 138, and a connection portion 140 connected to the forceps pipe 58 is formed in the first region 136.

  The treatment instrument insertion tube 134 is formed such that the inner diameter 140Di of the connection portion 140 is smaller than the outer diameter 58Do of the forceps pipe 58 before the forceps pipe 58 is connected. Further, the inner diameter 140Di of the connecting portion 140 is formed to be larger than the inner diameter 136Di on the proximal end side with respect to the connecting portion 140 of the first region 136. Further, in a state where the forceps pipe 58 and the treatment instrument insertion tube 134 are connected, the inner diameter 136Di is formed to be the same as the inner diameter 58Di of the forceps pipe 58 or smaller than the inner diameter 58Di of the forceps pipe 58.

  With the above-described configuration, according to the treatment instrument channel 132 of the third embodiment, the connection portion 140 is expanded outward by the insertion of the forceps pipe 58, and is closely attached to the forceps pipe 58 when the forceps pipe 58 is completely inserted. Fixed. At this time, the inner diameter 136Di is the same as or smaller than the inner diameter 58Di of the forceps pipe 58, so that the distal end of the treatment instrument can be reliably prevented from being caught by the proximal end 58A of the forceps pipe 58.

  Therefore, also in the treatment instrument channel 132 of the third embodiment, the treatment instrument can be smoothly advanced from the treatment instrument insertion tube 134 toward the forceps pipe 58.

  FIG. 17 is an enlarged cross-sectional view of a main part of the treatment instrument channel 142 of the fourth embodiment.

  In the treatment instrument channel 142 of the fourth embodiment, an outer pipe 144 is sheathed on the outer peripheral portion of the connection portion 140 of the treatment instrument insertion tube 134 shown in FIG. According to the treatment instrument channel 142, the deformation of the connecting portion 140 can be suppressed by the outer pipe 144.

  FIG. 18 is a cross-sectional view of a main part of the treatment instrument channel 150 of the fifth embodiment. In the description of the treatment instrument channel 150, the same or similar members as those of the treatment instrument channel 100 of the first embodiment shown in FIG.

  The difference of the treatment instrument channel 150 in FIG. 18 from the treatment instrument channel 100 (see FIG. 8) will be described. The outer pipe 102 is not provided with the projection 114, and the contact spring 108 is not provided. The adhesive 152 is applied only to the gap 106 between the extended portion 104 and the treatment instrument insertion tube 50. According to the treatment instrument channel 150 of FIG. 18, the gap region 110 of the treatment instrument insertion tube 50 can be protected and reinforced by the adhesive 152.

  FIG. 19 is a cross-sectional view of a main part of the treatment instrument channel 154 of the sixth embodiment. In the description of the treatment instrument channel 154, the same or similar members as those of the treatment instrument channel 150 shown in FIG.

  The difference between the treatment instrument channel 154 of FIG. 19 with respect to the treatment instrument channel 150 (see FIG. 18) will be described. From the gap 106 between the extension 104 of the outer pipe 102 and the treatment instrument insertion tube 50, the treatment instrument The adhesive 156 extends to the proximal end side of the insertion tube 50. According to the treatment instrument channel 154 of FIG. 19, the treatment instrument insertion tube 50 located on the proximal end side from the gap 106 can be reinforced by the adhesive 156.

  In the present embodiment, the ultrasonic endoscope 10 is exemplified as the endoscope, but the present invention is not limited to this. The ultrasonic endoscope 10 is a typical endoscope in which the main body central axis K of the forceps pipe 58 is inclined with respect to the central axis A of the treatment instrument insertion tube 50 (see FIG. 3). The treatment instrument channel can be preferably applied. That is, if the treatment instrument channel of the present invention is an endoscope in which the main body central axis K of the forceps pipe 58 is inclined with respect to the central axis A of the treatment instrument insertion tube 50, for example, a direct view type such as a colonoscope or the like. Even an endoscope can be applied.

DESCRIPTION OF SYMBOLS 1 Ultrasonic inspection system 10 Ultrasound endoscope 12 Ultrasound processor unit 14 Endoscope processor unit 16 Light source device 18 Monitor 20 Cart 22 Insertion part 24 Operation part 24a Treatment tool insertion port 24b Angle knob 24c Standing lever 24d Suction Button 24e Air supply / Water supply button 24f Switching button 26 Universal cord 28 Connector 30 Connector 32 Connector 34 Pole 36 Soft part 38 Bending part 40 Tip rigid part 42 Tip part main body 44 Treatment tool outlet 46 Node ring 46A Tip node ring 48 Pin 48A Pin 50 treatment instrument insertion tube 50A distal end 52 first region 52A inner peripheral portion 54 second region 54A inner peripheral portion 56 connection portion 58 forceps pipe 58A proximal end 60 ultrasonic observation portion 62 endoscope observation portion 64 stand 66 electroacoustic Conversion part 66a Observation surface 68 Backing material 70 Super sound Vibrator 72 Acoustic lens 74 Wiring connection portion 76 Wiring 78 Wiring insertion hole 80 Observation optical system 80a Observation window 82 Illumination optical system 82a Illumination window 84 Illumination optical system 84a Illumination window 86a Inclined surface 86b Inclined surface 88 Cleaning nozzle 90 Standing table accommodation Part 100 treatment tool channel 102 outer pipe 104 extension part 106 gap 108 contact spring 108A contact spring 110 gap area 112 boundary 114 projection 116 connecting pipe 118 treatment tool channel 120 treatment tool channel 122 treatment tool channel 124 treatment tool insertion tube 126 1st area | region 128 2nd area | region 130 Connection part 132 Treatment tool channel 134 Treatment tool insertion tube 136 1st area | region 138 2nd area | region 140 Connection part 142 Treatment tool channel 144 Outer pipe 150 Treatment tool channel 152 Adhesive 154 Treatment tool channel 156 Adhesive 200 Treatment instrument insertion tube 200A distal end 202 connection portion 204 forceps pipe 204A proximal end 206 treatment instrument channel 208 puncture needle 210 sheath 210A distal end

Claims (15)

A pipe member attached to the distal end body of the endoscope insertion portion and communicated with a treatment instrument outlet provided in the distal end body;
A treatment instrument insertion tube connected to the pipe member;
With
The treatment instrument insertion tube has a first region formed on a distal end side of the treatment instrument insertion tube, and a second region formed on a proximal end side with respect to the first region,
The first region is a region having higher crush resistance than the second region,
A connection portion connected to the pipe member is formed in the first region.
Endoscope treatment instrument channel. In a state before the treatment instrument insertion tube is connected to the pipe member, an inner diameter of the connection portion is smaller than an outer diameter of the pipe member, and an inner diameter of the connection portion is the connection portion of the first region. It is formed larger than the inner diameter on the more proximal side,
In a state where the pipe member and the treatment instrument insertion tube are connected, the inner diameter on the proximal end side from the connection portion in the first region is the same as the inner diameter of the pipe member or the inner diameter of the pipe member. Is also formed small,
The treatment instrument channel of the endoscope according to claim 1. In a state before the connection portion is connected to the pipe member, an outer diameter of the connection portion is formed larger than an outer diameter on the proximal end side with respect to the connection portion in the first region.
The treatment instrument channel of the endoscope according to claim 2. In the treatment instrument insertion tube, an outer pipe is sheathed on the outer peripheral portion of the connection portion,
The outer pipe is formed with an extending portion extending from the connecting portion to the proximal end side of the treatment instrument insertion tube.
The treatment instrument channel of the endoscope according to claim 2 or 3. The second region is formed on the proximal end side of the treatment instrument insertion tube with respect to the outer pipe.
The treatment instrument channel of the endoscope according to claim 4. In a state before the treatment instrument insertion tube is connected to the pipe member, an inner diameter of the connection portion is smaller than an outer diameter of the pipe member, and an inner diameter of the connection portion is the connection portion of the first region. It is formed larger than the inner diameter on the more proximal side,
In a state where the pipe member and the treatment instrument insertion tube are connected, the inner diameter on the proximal end side from the connection portion in the first region is the same as the inner diameter of the pipe member or the inner diameter of the pipe member. Is also formed small
In a state before the connection portion is connected to the pipe member, the outer diameter of the connection portion is formed larger than the outer diameter on the proximal end side from the connection portion of the first region,
In the treatment instrument insertion tube, an outer pipe is sheathed on the outer peripheral portion of the connection portion,
The outer pipe is formed with an extending portion extending from the connection portion to the proximal end side of the treatment instrument insertion tube,
An adhesive is applied to the gap between the extension part and the treatment instrument insertion tube,
The treatment instrument channel of the endoscope according to claim 1. The adhesive extends from the gap to the proximal end side of the treatment instrument insertion tube,
The treatment instrument channel of the endoscope according to claim 6. The second region is formed on the proximal end side of the treatment instrument insertion tube with respect to the outer pipe.
The treatment instrument channel of the endoscope according to claim 6 or 7. In a state before the treatment instrument insertion tube is connected to the pipe member, an inner diameter of the connection portion is smaller than an outer diameter of the pipe member, and an inner diameter of the connection portion is the connection portion of the first region. It is formed larger than the inner diameter on the more proximal side,
In a state where the pipe member and the treatment instrument insertion tube are connected, the inner diameter on the proximal end side from the connection portion in the first region is the same as the inner diameter of the pipe member or the inner diameter of the pipe member. Is also formed small
In a state before the connection portion is connected to the pipe member, the outer diameter of the connection portion is formed larger than the outer diameter on the proximal end side from the connection portion of the first region,
In the treatment instrument insertion tube, an outer pipe is sheathed on the outer peripheral portion of the connection portion,
The outer pipe is formed with an extending portion extending from the connection portion to the proximal end side of the treatment instrument insertion tube,
A close contact spring is provided in the gap between the extension portion and the treatment instrument insertion tube, and is provided on the outer periphery of the treatment instrument insertion tube.
The treatment instrument channel of the endoscope according to claim 1. The contact spring extends from the gap to the proximal end side of the treatment instrument insertion tube.
The treatment instrument channel of the endoscope according to claim 9. The second region is formed on the proximal end side of the treatment instrument insertion tube with respect to the outer pipe.
The treatment instrument channel of the endoscope according to claim 9 or 10. The boundary portion formed between the first region and the second region of the treatment instrument insertion tube is provided within a range where the adhesion spring is sheathed.
The treatment instrument channel of the endoscope according to claim 9 or 10. An annular protrusion that protrudes toward the outer periphery of the treatment instrument insertion tube is provided on the inner periphery of the extension of the outer pipe.
The treatment instrument channel of the endoscope according to any one of claims 9 to 12. The endoscope insertion portion is composed of a flexible portion, a bending portion and the distal end portion main body from the proximal end side toward the distal end side,
The boundary portion formed between the first region and the second region of the treatment instrument insertion tube is located on the distal side of the bending portion in the direction from the distal end of the treatment instrument insertion tube toward the proximal end. Formed in position,
The treatment instrument channel of the endoscope according to any one of claims 1 to 13. The treatment instrument channel of the endoscope according to any one of claims 1 to 14,
Endoscope.

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