JP2010012172A - Endoscope distal end length adjustment system, endoscope hood - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To switch a projected state of an endoscope hood from an insertion tube end surface and a stored state thereof without making a diameter of a distal end of the insertion tube large. <P>SOLUTION: This endoscope distal end length adjustment system has the endoscope hood 20, and a displacement transmitting part 30. The endoscope hood 20 has a hood body, and a first driving magnet 22. The hood body is cylindrically formed so that the insertion tube 42 may be inserted therein. The first driving magnet 22 is embedded near an end part of an insertion side of the hood body. The displacement transmitting part 30 has a second driving magnet and transmission wire. The second driving magnet is attached to one end of the transmission wire. The endoscope hood 20 is inserted into the insertion tube 42. The endoscope hood 20 is inserted into a projection switching channel 46 from the side of the second driving magnet. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an endoscope tip adjustment system and an endoscope hood that separate an end surface of an insertion tube of an endoscope from a distal end side and a subject at a certain distance.

  An endoscope hood that is attached to a distal end of an insertion tube of an endoscope is known. The endoscope hood is formed so as to perform a function according to the purpose. For example, an endoscope hood protruding from the end face of the distal end is known. By projecting from the end face, it is possible to prevent the subject from coming into direct contact with the lens of the endoscope and to secure a good visual field.

  However, when the projection amount of the endoscope hood is large, insertion may be difficult. Further, when a treatment is performed on the body using a treatment tool, the residue or water used to remove the residue may adhere to the endoscope hood and narrow the field of view.

  An endoscope hood capable of adjusting the amount of protrusion from the end face of the distal end has been proposed for such problems (see Patent Document 1 and Patent Document 2). In the endoscope hoods described in Patent Literature 1 and Patent Literature 2, the projection and storage from the end face of the endoscope hood are switched by injecting or sucking a fluid into a sealed space formed in the endoscope hood. Is possible.

However, when such a sealed space is formed, it is necessary to increase the diameter of the tip of the insertion tube. In addition, since it is necessary to securely seal the sealed space, it has been a problem that high manufacturing accuracy is required.
JP 2000-79086 A JP-A-11-299725

  Therefore, in the present invention, the length of the endoscope tip that can be switched between protruding and retracting from the end face of the insertion tube without increasing the diameter of the insertion tube of the endoscope and without requiring high manufacturing accuracy. The purpose is to provide an adjustment system.

  The endoscope tip length adjustment system according to the present invention is attached to the side surface of the insertion tube so as to be movable back and forth along the longitudinal direction of the insertion tube at the distal end of the insertion tube of the endoscope, and proceeds to the distal end side to move away from the distal end. A distance regulating body that protrudes from the end face of the distal end and abuts against the subject to move the subject away from the end face of the distal end, a first magnet fixed to the spacing regulating body, and the vicinity of the distal end or the distal end A second magnet that is displaceable near the distal end in the lumen that extends along the insertion tube and that attracts the first magnet to each other, and a second magnet that is formed to extend along the lumen and is first at one end. And a displacement adjusting body that is inserted into the lumen so as to dispose the second magnet in the vicinity of the distal end and that displaces the second magnet in the vicinity of the distal end.

  In addition, it is preferable that a space | interval control body is formed in the cylinder shape fitted to an insertion pipe, and is slidably inserted in an insertion pipe.

  Further, it is preferable that at least one of the space regulating body and the side surface of the insertion tube in the vicinity of the distal end is subjected to a surface treatment for reducing friction between the space regulating body and the insertion tube.

  Alternatively, it is preferable that a friction reducing body for reducing the friction between the spacing regulating body and the insertion tube is provided between the spacing regulating body and the side surface of the insertion tube in the vicinity of the distal end.

  Moreover, it is preferable to provide a support body that supports the indirect regulating body slidably along the longitudinal direction of the insertion tube at the distal end and is detachable from the distal end.

  Moreover, it is preferable that the support body is formed in a cylindrical shape that fits into the insertion tube, and the interval regulating body is formed in a cylindrical shape that fits in the support body.

  Moreover, it is preferable that a lumen part is provided in an insertion tube.

  In addition, it is preferable to use a forceps channel provided in the insertion tube to transmit the treatment tool to the distal end as the lumen portion.

  Moreover, it is preferable that the displacement adjusting body is formed in a tubular shape that can be inserted into the forceps channel, and the treatment instrument can be inserted into the tubular shape.

  Further, it is preferable that a friction reducing body for reducing friction between the lumen portion and the displacement adjusting body is provided between the lumen portion and the displacement adjusting body.

  Alternatively, it is preferable that at least one of the inner surface of the lumen portion and the displacement adjustment body is subjected to a surface treatment that reduces friction between the lumen portion and the displacement adjustment body.

  The endoscope hood of the present invention is attached to the side surface of the insertion tube so as to be able to advance and retreat along the longitudinal direction of the insertion tube at the distal end of the insertion tube of the endoscope, and proceeds to the distal end side to advance the distal end of the insertion tube. A spacing regulator that protrudes from the end face and abuts against the subject to move the subject away from the end face of the distal end, and a lumen that is fixed to the spacing regulator and extends along the insertion tube to the distal end or near the distal end. A second magnet that is displaceable inside and a first magnet that attracts each other are provided.

  According to the present invention, it is possible to switch between protrusion from the distal end of the insertion tube and storage without increasing the diameter of the distal end of the insertion tube.

  Embodiments of the present invention will be described below with reference to the drawings.

  First, an electronic endoscope having an endoscope tip length adjustment system to which the first embodiment of the present invention is applied will be described with reference to FIG. FIG. 1 is an external view of an electronic endoscope 40 to which an endoscope hood to which the first embodiment of the present invention is applied is mounted.

  The electronic endoscope 40 includes an operation unit 41, an insertion tube 42, and a connector 43. The operation unit 41 and the insertion tube 42 are connected. Further, the operation unit 41 and the connector 43 are connected. An endoscope hood (not shown in FIG. 1) is attached to the distal end tip of the insertion tube 42.

  A light guide (not shown) for transmitting illumination light from the connector 43 to the distal end of the insertion tube 42 is extended. A signal line for transmitting an image signal from an imaging element (not shown) provided at the distal end of the insertion tube 42 for receiving a subject image is extended to the connector 43.

  A forceps channel 44 extending from the proximal end to the distal end of the insertion tube 42 is provided inside the insertion tube 42. The forceps channel 44 is connected to a treatment instrument insertion port 45 provided on the proximal end side of the insertion tube 42. By inserting a treatment tool such as forceps (not shown in FIG. 1) from the treatment tool insertion port 45 into the forceps channel 44, the treatment tool can reach the distal end side.

  In addition, a projection switching channel 46 extending along the insertion tube from the proximal end of the insertion tube 42 to the vicinity of the distal end is provided inside the insertion tube 42. The protrusion switching channel 46 is connected to a magnet insertion port 47 provided on the proximal end side of the insertion tube 42. As will be described later, a second drive magnet (not shown in FIG. 1) connected to a transmission wire (not shown in FIG. 1) is inserted into the protrusion switching channel 46.

  Next, an endoscope tip length adjustment system to which the first embodiment is applied will be described with reference to FIGS. FIG. 2 is an external view of the endoscope tip length adjustment system. FIG. 3 is an external view of the distal end of an insertion tube of an electronic endoscope in which the endoscope tip length adjustment system and the endoscope tip length adjustment system are used. The endoscope tip length adjustment system 10 includes an endoscope hood 20 and a displacement transmission unit 30.

  The endoscope hood 20 includes a hood main body 21 (interval regulating body) and a first drive magnet 22. The hood body 21 is formed in a cylindrical shape having an inner diameter substantially equal to the outer diameter of the distal end side of the insertion tube 42 (see FIG. 3), and can be fitted to the distal end side tip. In order to reduce the frictional resistance with the insertion tube 42, the inner surface of the hood body 21 is subjected to a dry lube process.

  One of the cylindrical both ends of the hood main body 21 is defined as an insertion side end, and the other is defined as a protruding side end (see FIG. 2). A hooking piece 23 is formed on the inner surface of the hood main body 21 in the vicinity of the insertion side end.

  In addition, the groove part 48 along a longitudinal direction is formed in the side surface of the insertion tube 42 near the front-end | tip of a distal end (refer FIG. 3). The groove 48 is closed at least at the distal end. Further, as shown in FIG. 4, when viewed from the axial direction of the distal end of the insertion tube 42, a straight line that passes through the groove 48 and the central axis and a straight line that passes through the projection switching channel 46 (lumen portion) and the central axis. The formation position of the groove portion 48 is determined so that the angle therebetween is an arbitrary first angle θ1.

  The hood body 21 is inserted into the insertion tube 42 so that the engagement piece 23 is engaged with the groove portion 48. Since the engaging piece 23 is applied to the end portion of the groove portion 48, the hood main body 21 is prevented from falling off the insertion tube 42. On the other hand, the hood body 21 is slidable in the longitudinal direction of the insertion tube 42.

  The first drive magnet 22 is embedded and fixed at a position near the insertion side end of the hood main body 21. As shown in FIG. 5, when viewed from the cylindrical axis direction, the angle between the straight line passing through the engagement piece 23 and the cylindrical axis center and the straight line passing through the first drive magnet 22 and the cylindrical axis center is the first angle θ1 The embedded position of the first drive magnet 22 is determined so that

  The displacement transmission part 30 is comprised by the 2nd drive magnet 31, the transmission wire 32 (displacement adjustment body), and the coil 33 (refer FIG. 2). A second drive magnet 31 is attached to one end of the transmission wire 32. The coil 33 is wound around the transmission wire 32 from the vicinity of the end where the second drive magnet 31 is attached to the other end.

  The displacement transmission unit 30 is inserted into a protrusion switching channel 46 provided in the insertion tube 42 (see FIG. 3). The protruding switching channel 46 is formed so as not to penetrate the insertion tube 42 and to be closed in the vicinity of the distal end.

  The transmission wire 32 has flexibility, and if the frictional resistance with the inner surface of the projection switching channel 46 is large, the transmission wire 32 may buckle when being pushed into the projection switching channel. Therefore, winding the coil 33 around the transmission wire 32 reduces the frictional resistance and prevents buckling.

  As the transmission wire 32, a wire longer than the length from the distal end of the insertion tube 42 to the magnet insertion port 47 is used. The end of the other transmission wire 32 of the end to which the second drive magnet 31 is attached is connected to a displacement drive unit (not shown). The second drive magnet 31 is displaced along the projection switching channel 46 by the displacement drive unit pushing or pulling the transmission wire 32.

  A method of using the endoscope distal length adjustment system 10 according to the first embodiment having the above-described configuration will be described. As described above, the endoscope hood 20 is inserted into the insertion tube 42 so that the engagement piece 23 is engaged with the groove portion 48. Further, as described above, the displacement transmission unit 30 is inserted from the magnet insertion port 47 until the second drive magnet 31 reaches the vicinity of the end portion on the distal end side of the projection switching channel 46.

  When the endoscope hood 20 is inserted into the insertion tube 42 so that the engagement piece 23 is engaged with the groove portion 48, the second drive magnet 31 inserted into the protrusion switching channel 46 and the first drive magnet 22 are interposed. Attraction is applied. Due to the attractive force, the first drive magnet 22 is displaced along with the hood body 21 along the longitudinal direction of the insertion tube 42 so that the distance from the second drive magnet 31 is the shortest.

  As shown in FIG. 6, when the second drive magnet 31 is stopped at the first position along the longitudinal direction of the insertion tube 42, the first drive magnet 22 moves backward from the distal end side together with the hood body 21. The first position is reached. When the first drive magnet 22 is in the first position, the protruding end of the hood body 21 overlaps the end surface of the distal end of the insertion tube 42.

  As shown in FIG. 7, when the second drive magnet 31 is stopped at the second position closer to the distal end side of the insertion tube 42 than the first position, the first drive magnet 22 is moved to the hood body. It advances to the distal end side together with 21 and reaches the second position. When the first drive magnet 22 is in the second position, the hood body 21 protrudes from the end face of the distal end.

  The displacement drive unit pushes and indexes the transmission wire 32 so as to displace the second drive magnet 31 to the first and second positions based on the user's operation input.

  In addition, an electronic device such as an imaging device (not shown) for imaging a subject is provided at the distal end of the insertion tube 42, and a signal line (not shown) connected to the imaging device is connected to the insertion tube 42. Is inscribed. In order to reduce the influence of the magnetic force of the first and second drive magnets 22 and 31 on these electronic devices and signal lines, the electronic devices and signal lines are made of, for example, titanium, aluminum, gold, synthetic resin, etc. Covered with a non-magnetic material to shield the magnetic force.

  According to the endoscope tip length adjustment system of the first embodiment configured as described above, the hood main body 21 is retracted from the end surface on the distal end side of the insertion tube 42 by the operation of the user (see FIG. 6). Or it can switch to a protrusion state (refer to Drawing 7).

  Moreover, since it is not necessary to form an airtight space in the hood main body 21 and the first drive magnet 22 is fixed, it is possible to prevent the endoscope hood 20 from increasing in diameter. Furthermore, since the driving force of the endoscope hood is transmitted with a simple configuration without using a fluid, it is not necessary to increase the airtightness of the lumen into which the displacement transmitting unit 30 is inserted, that is, the protrusion switching channel 46, and the manufacturing is easy. is there.

  Next, an endoscope tip length adjustment system according to a second embodiment of the present invention will be described. In the second embodiment, the configuration of the hood main body is different from that of the first embodiment. The following description will focus on differences from the first embodiment. In addition, the same code | symbol is attached | subjected to the site | part which has the same function as 1st Embodiment.

  The endoscope tip length adjustment system according to the second embodiment includes an endoscope hood and a displacement transmission unit 30. The configuration and function of the displacement transmitting unit 30 are the same as those in the first embodiment.

  As shown in FIG. 8, the endoscope hood 200 includes a hood main body 210 and a first drive magnet 22. Unlike the first embodiment, the hood main body 210 includes first and second cylindrical bodies 210a and 210b. The first cylindrical body 210a (support) is formed in a cylindrical shape whose inner diameter is substantially equal to the outer diameter of the distal end side distal end of the insertion tube 42 or whose inner diameter is shorter than the outer diameter of the distal end side distal end. Is done. The second cylindrical body 210b (interval regulating body) is formed in a cylindrical shape having an inner diameter substantially equal to the outer diameter of the first cylindrical body 210a.

  As in the first embodiment, one of the cylindrical end portions of the first and second cylindrical bodies 210a and 210b is defined as an insertion side end, and the other is defined as a protruding side end. The engaging piece 23 is formed on the inner surface of the second cylindrical body 210b near the insertion side end. Further, a groove portion 24 is formed on the outer surface of the first cylindrical body 210a along the cylindrical axis direction. Both ends of the groove portion 24 are closed.

  The first cylindrical body 210a is inserted into the second cylindrical body 210b so that the engaging piece 23 is engaged with the groove 24. Therefore, the second cylindrical body 210b is supported by the first cylindrical body 210a. When the engaging piece 23 is engaged with the groove portion 24, the second cylindrical body 210b is relatively removed from the first cylindrical body 210a while preventing the second cylindrical body 210b from falling off from the first cylindrical body 210a. It can be displaced along the axial direction.

  The outer surface of the first cylindrical body 210a and the inner surface of the second cylindrical body 210b are subjected to dry lube processing in order to reduce the frictional resistance therebetween. In order to prevent the endoscope hood 200 from falling off the insertion tube 42, the inner surface of the first cylindrical body 210a is not subjected to surface treatment for reducing frictional resistance.

  The first drive magnet 22 is embedded at a position near the insertion side end of the second cylindrical body 210b.

  When the endoscope tip length adjustment system according to the second embodiment is used, the endoscope hood 200 is inserted into the insertion tube 42 as in the first embodiment. Similarly to the first embodiment, the displacement transmission unit 30 is inserted into the magnet insertion port 47 from the second drive magnet 31 side.

  Note that straight ends (not shown) extending in the axial direction and the longitudinal direction are written on the distal ends of the hood main body 210 and the insertion tube 42, respectively, and the endoscope hood so that both straight lines are aligned. When 210 is inserted into the insertion tube 42, the distance between the first drive magnet 22 and the protrusion switching channel 46 is the shortest.

  According to the endoscope tip length adjustment system of the second embodiment having the above-described configuration, the second end face of the insertion tube 42 is moved from the end surface on the distal end side by the user's operation, as in the first embodiment. The cylindrical body 210b can be switched between a protruding state and a retracted state. Further, as in the first embodiment, it is not necessary to form an airtight space in the hood main body 210, and the first drive magnet 22 only needs to be fixed. Therefore, it is possible to prevent the endoscope hood 200 from increasing in diameter. . Furthermore, since the driving force of the endoscope hood 200 is transmitted with a simple configuration without using a fluid, the manufacture is easy.

  Furthermore, in the second embodiment, since it is not necessary to form the groove portion 48 in the insertion tube 42, it is possible to use the endoscope tip length adjustment system for a general-purpose electronic endoscope in which the groove portion is not formed. is there.

  Next, an endoscope tip length adjustment system according to a third embodiment of the present invention will be described. In the third embodiment, the configuration of the displacement transmission unit is different from that of the first embodiment. The following description will focus on differences from the first embodiment. In addition, the same code | symbol is attached | subjected to the site | part which has the same function as 1st Embodiment.

  The endoscope tip length adjustment system according to the third embodiment includes an endoscope hood 20 and a displacement transmission unit. The configuration and function of the endoscope hood 20 are the same as those in the first embodiment.

  As shown in FIG. 9, the displacement transmission unit 300 includes a second drive magnet 310, a transmission tube 34 (displacement adjusting body), and a coil 33. The transmission tube 34 is formed in a tubular shape, and a cylindrical second drive magnet 310 is wound around one end. The coil 33 is wound around the transmission tube 34 from the vicinity of the end where the second drive magnet 310 is wound to the other end.

  When the endoscope tip length adjustment system according to the third embodiment is used, the endoscope hood 20 is inserted into the insertion tube 42 as in the first embodiment. As shown in FIG. 10, the displacement transmission unit 300 is inserted into the forceps channel 44 (lumen portion) formed in the insertion tube 42.

  According to the endoscope tip length adjustment system of the third embodiment configured as described above, the hood main body 21 from the distal end surface of the insertion tube 42 by the user's operation, as in the first embodiment. Can be switched between the protruding state and the retracted state. Further, as in the first embodiment, it is not necessary to form an airtight space in the hood main body 21 and the first drive magnet 22 only needs to be fixed, so that the diameter of the endoscope hood 20 can be prevented from increasing. . Furthermore, since the driving force of the endoscope hood 20 is transmitted with a simple configuration without using a fluid, manufacturing is easy.

  Furthermore, in the third embodiment, since the displacement transmission unit 300 is inserted into the forceps channel 44, the projection switching channel 46 does not need to be formed in the insertion tube 42, and a general-purpose electronic endoscope has an endoscope tip length. An adjustment system can be used. Further, since the transmission tube 34 is tubular, a treatment tool such as forceps can be inserted into the tube, and the treatment tool is used while the forceps channel 44 is used for driving the displacement of the endoscope hood 20. Is possible.

  In the first to third embodiments, the hood main bodies 21 and 210 are formed in a cylindrical shape, but may not be cylindrical. The hood main body is attached to the insertion tube so that a part of the hood main body can slide along the longitudinal direction of the insertion tube, and the hood main body hits the subject when the hood main body protrudes from the end surface of the insertion tube. Any shape may be used as long as it can contact and be separated from the end face of the insertion tube 42. For example, even if a guide rail for the insertion tube 42 is provided and a plate member having a flange portion fitted to the guide rail and extending in the longitudinal direction, it can be used as a hood body that exhibits the above function.

  Moreover, although it is the structure which displaces the 2nd drive magnets 31 and 310 using the transmission wire 32 in 1st, 2nd embodiment and the transmission tube 34 in 3rd Embodiment, it has flexibility, Any member that can move in the lumen extending along the insertion tube and displace the second drive magnet can be used as a transmission body that transmits the pushing force and the traction force to the second drive magnets 31 and 310. Is possible.

  Further, in the first and third embodiments, the inner surface of the hood main body 21 is subjected to a dry lube process, and in the second embodiment, the contact surface between the first and second cylindrical bodies 210a and 210b is subjected to a dry lube process. Any surface treatment capable of reducing the frictional resistance may be applied to at least one of the contact surfaces.

  Alternatively, even if a member for reducing the frictional resistance is provided, the same effect as the present embodiment can be obtained. Furthermore, even if the surface treatment is not performed or the member for reducing the frictional resistance is not provided, it is possible to obtain the same effect as the present embodiment.

  In the first to third embodiments, the displacement transmitting units 30 and 300 are configured to be inserted into a lumen (projection switching channel 46 or forceps channel 44) formed inside the insertion tube 42. You may insert in the tube etc. which are attached outside along the pipe | tube 42. FIG.

  The coil 33 is wound around the transmission wire 32 in the first and second embodiments and the transmission tube 34 in the third embodiment. However, the displacement is transmitted to the transmission wire 32 or the transmission tube 34. A member capable of reducing frictional resistance between the lumen (projection switching channel 46 or forceps channel 44) into which the portions 30 and 300 are inserted may be attached. Alternatively, any one of the inner surface of the lumen and the outer surface of the transmission wire 32 or the transmission tube 34 may be subjected to a surface treatment that reduces frictional resistance.

  Moreover, in the 1st-3rd embodiment, although it is the structure by which the engagement piece 23 and the groove parts 48 and 24 are formed, it does not need to be formed. Even if these portions are not formed, it is possible to obtain effects such as preventing the distal end of the insertion tube 42 from becoming larger in diameter. However, in order to prevent the endoscope hoods 20 and 200 from falling off the insertion tube 42 in the body or the like, it is preferable that the engaging piece 23 is engaged with the grooves 48 and 24.

  Further, in the present embodiment, the endoscope hood is configured to be used for an electronic endoscope, but can also be used for a fiberscope.

1 is an external view of an endoscope to which an endoscope tip length adjustment system to which a first embodiment of the present invention is applied is mounted. It is a perspective view of the endoscope tip length adjustment system of a 1st embodiment. It is an external view which shows the insertion tube which mounts | wears with the endoscope tip length adjustment system and endoscope tip length adjustment system of 1st Embodiment. In order to show the relative position of the groove part with respect to a protrusion switching channel, it is the perspective view which looked at the edge part of the distal end side of an insertion tube from the axial direction. In order to show the relative position of the 1st drive magnet with respect to a latching piece, it is the perspective view which looked at the endoscope hood from the cylindrical-axis direction. In order to show the storing state of an endoscope hood, it is a sectional view along an axial direction of an insertion tube of an endoscope hood and an insertion tube. In order to show the protrusion state of an endoscope hood, it is a sectional view along an axial direction of an insertion tube of an endoscope hood and an insertion tube. It is a perspective view of the endoscope hood of a 2nd embodiment. It is a perspective view of the displacement transmission part of 3rd Embodiment. It is an external view which shows the insertion tube which mounts | wears with the endoscope tip length adjustment system and endoscope tip length adjustment system of 2nd Embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Endoscope length adjustment system 20, 200 Endoscope hood 21, 210 Hood main body 210a, 210b 1st, 2nd cylindrical body 22 1st drive magnet 23 Engagement piece 24 Groove part 30, 300 Displacement transmission part 31, 310 Second Drive Magnet 32 Transmission Wire 33 Coil 34 Transmission Tube 42 Insertion Tube 44 Forceps Channel 46 Projection Switching Channel 47 Magnet Insertion Port 48 Groove

Claims (12)

A distal end of the insertion tube of the endoscope is attached to the side surface of the insertion tube so as to be movable back and forth along the longitudinal direction of the insertion tube, and proceeds to the distal end side to protrude from the end surface of the distal end. An interval regulating body that separates the subject from the end face of the distal end by contacting the subject; and
A first magnet fixed to the spacing regulating body;
A second magnet that is displaceable near the distal end in a lumen that extends along the insertion tube to the distal end or near the distal end and attracts the first magnet to each other;
The second magnet is formed so as to extend along the lumen portion, and the second magnet is connected to one end portion, and the second magnet is inserted into the lumen portion so as to be disposed near the distal end. An endoscope tip length adjustment system comprising: a displacement adjustment body that displaces the second magnet in the vicinity of the distal end.   2. The endoscope distal end length adjustment system according to claim 1, wherein the distance regulating body is formed in a cylindrical shape that fits into the insertion tube, and is slidably inserted into the insertion tube.   At least one of the space regulating body and the side surface of the insertion tube in the vicinity of the distal end is subjected to a surface treatment for reducing friction between the space regulating body and the insertion tube. The endoscope tip length adjustment system according to claim 2.   The friction reducing body for reducing friction between the spacing regulating body and the insertion tube is provided between the spacing regulating body and a side surface of the insertion tube in the vicinity of the distal end. Endoscope length adjustment system described in 1.   The internal vision according to claim 1, further comprising a support body that slidably supports the indirect regulating body along a longitudinal direction of the insertion tube at the distal end and is detachable from the distal end. Mirror tip length adjustment system.   6. The endoscope distal end according to claim 5, wherein the support body is formed in a cylindrical shape that fits into the insertion tube, and the interval regulating body is formed in a cylindrical shape that fits in the support body. Long adjustment system.   The endoscope distal end length adjustment system according to any one of claims 1 to 6, wherein the lumen portion is provided in the insertion tube.   The forceps channel provided in the said insertion tube in order to transmit a treatment tool to the said distal end as said lumen | bore part is used, The inside of any one of Claims 1-6 characterized by the above-mentioned. Endoscope length adjustment system.   The endoscope distal length adjustment system according to claim 8, wherein the displacement adjustment body is formed in a tubular shape that can be inserted into the forceps channel, and the treatment instrument can be inserted into the tubular shape.   The friction reducing body for reducing the friction between the lumen portion and the displacement adjusting body is provided between the lumen portion and the displacement adjusting body. The endoscope tip length adjustment system according to any one of claims 9 to 9.   2. A surface treatment for reducing friction between the lumen and the displacement adjusting body is performed on at least one of the inner surface of the lumen and the displacement adjusting body. The endoscope tip length adjustment system according to any one of claims 9 to 9. A distal end of the insertion tube of the endoscope is attached to the side surface of the insertion tube so as to be movable back and forth along the longitudinal direction of the insertion tube, and proceeds to the distal end side to protrude from the end surface of the distal end. An interval regulating body that separates the subject from the end face of the distal end by contacting the subject; and
A second magnet that is fixed to the spacing regulator and that is displaceable within a lumen that extends along the insertion tube to the distal end or near the distal end, and a first magnet that attracts each other. An endoscope hood characterized by that.

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