JP2013027638A - Insertion assisting tool for endoscope - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an insertion assisting tool for an endoscope which includes an operating mechanism for switching tubes through which washing water or the like for an observation window and a lighting window of an insertion portion of the endoscope into opening condition or closing condition, and works as follows: one of two tubes is turned into opening condition and another tube is turned into closing condition by a primary stage operation of an operation member, and both of the tubes are turned into opening condition by a secondary stage operation of the operation member.SOLUTION: In the insertion assisting tool 10 attached to a rigid endoscope 12, a handle portion 30 is provided at the proximal end of a sheath insertion portion 14. In the handle portion 30, a tube for supplying COgas and a tube for supplying washing water are inserted into a nozzle at the distal end of the sheath insertion portion 14. When an air- and water-sending lever is pushed down by one stage, the end part of a torsion coil spring 94 is pushed down by the air- and water-sending lever to open the tube for supplying the gas, and when the lever is pushed down further by one stage, the end part of a return coil spring 96 is pushed down by the air- and water-sending lever to open the tube for supplying the liquid.

Description

  The present invention relates to an endoscope insertion aid, and more particularly to an endoscope insertion aid provided with a cleaning mechanism for cleaning an observation window and an illumination window provided in an insertion portion of an endoscope.

  In the medical field, medical diagnosis using an endoscope is widely performed. Since such an endoscope is used in an environment where the distal end portion of the insertion portion is easily contaminated, the observation window and the illumination window provided at the distal end portion of the insertion portion are always kept clean to ensure a good visual field. There is a need.

  Patent Documents 1 to 4 disclose endoscope insertion aids (simply referred to as insertion aids) provided with a cleaning mechanism used for rigid endoscopes and the like. According to this, the insertion assisting tool includes a sheath main body portion mounted on the endoscope main body portion and a sheath insertion portion into which the endoscope insertion portion is inserted. The sheath insertion part is configured such that its inner diameter is larger than the outer diameter of the insertion part of the rigid endoscope. As a result, a fluid supply passage is formed between the sheath insertion portion and the endoscope insertion portion in the mounted state in which the endoscope insertion portion is inserted into the sheath insertion portion. The fluid supply passage is communicated with a nozzle provided at the distal end portion of the sheath insertion portion. Therefore, when a fluid such as cleaning liquid or gas is supplied to the fluid supply passage, the fluid is ejected from the nozzle to the observation window and the illumination window of the endoscope, so that the observation window and the illumination window are kept clean.

  In Patent Document 3, a liquid supply passage for supplying a liquid such as washing water and a gas supply passage for a gas such as air are provided as fluid supply passages of the sheath insertion portion, and each of them is connected to each of them. There is disclosed an apparatus in which water and air are simultaneously supplied from a tube so that a mixed fluid obtained by mixing water and air can be jetted from a nozzle at the distal end of a sheath insertion portion to an observation window. It is known that by jetting such a mixed fluid to the observation window, it is possible to obtain a cleaning ability superior to that of jetting only water to the observation window.

  In addition, as an operation mechanism for switching on / off the injection of fluid to the observation window, Patent Document 4 discloses a tube of a tube by pressing (crushing) a tube that supplies a fluid to a fluid supply passage of an insertion aid. It has been proposed to switch to an open state in which a tube line is opened by releasing the pressure of the tube by closing the path. According to this, the tube is set to a closed state when the practitioner does not operate the operation member of the operation mechanism, and the tube is held in a state where the ejection of fluid to the observation window is stopped. On the other hand, when the practitioner performs a predetermined operation on the operation member of the operation mechanism, the tube is switched to the open state, and fluid is ejected to the observation window.

  Further, this Patent Document 4 discloses a suction for collecting the cleaning water sprayed to the observation window by suction in addition to the passage for supplying the cleaning water between the sheath insertion portion and the endoscope insertion portion of the insertion assisting tool. It is disclosed to provide a passageway. An operation mechanism is disclosed in which the spraying of cleaning water into the observation window and the on / off of suction can be switched by a two-step pressing operation of one operation lever. According to this, for each of the two tubes (washing water tube and suction tube) connected to each passage, one tube pressing portion interlocked with one operation lever is provided for each tube individually. By sandwiching each tube with the tube engaging portion thus formed, each tube is pressed and set in a closed state. When the operating lever is pushed down from this state, the tube pressing portion is elastically deformed and pressed down with a predetermined position as a fulcrum, and the pressing of the tube is released and switched to the open state. At this time, since the tube locking portion of the suction tube is disposed at a position farther from the fulcrum of the tube pressing portion than the tube engaging portion of the cleaning water tube, first, the tube locking portion is moved from the fulcrum. The suction tube at a distant position is released from being pressed and opened, and suction at the distal end of the endoscope insertion portion is turned on. After that, the pressing of the cleaning water tube in which the tube locking portion is close to the fulcrum is released and the tube is in the open state, and the injection of cleaning water to the observation window is turned on.

  On the other hand, when the operating lever is pushed down and returned to the non-operating position, the washing water tube is first pressed and closed, and the washing water to the observation window is closed. Injection is turned off. At this time, since the suction is turned on, the washing water remaining in the observation window or the like is collected. Thereafter, the suction tube is pressed and closed, and suction is also turned off.

  Accordingly, the two-step operation with only one operation lever can switch the washing water injection and suction on / off in an appropriate order, improving the operability such that the operation can be performed with only one hand. It has been.

JP 7-275185 A JP-A-9-135804 JP 2008-93173 A Japanese Patent No. 3833763

  By the way, as an operation mechanism for switching on / off of jetting of washing water or the like to the observation window, it is preferable to use a tube as in Patent Document 4 rather than using a device such as a switching valve as described in Patent Documents 1 and 3. The operation mechanism that opens and closes the pipeline by pressing has an advantage that the configuration is simple and the manufacturing cost can be reduced.

  However, in the case of the operation mechanism described in Patent Document 4, the conduit of one tube (suction tube) is completely opened and the conduit of the other tube (wash water tube) is completely blocked. There is a problem that it is difficult to make it into a state. That is, when the tube pressing part is pushed down by pushing down the operation lever, the tube pressing part is displaced in a direction away from both the tube locking parts regardless of the distance from the fulcrum of the tube locking part. Therefore, when the suction tube is released and the conduit is completely opened, the tube locking portion of the cleaning water tube is also separated from the tube pressing portion, and the conduits of both tubes can be opened. There is sex.

  On the other hand, it is possible to completely close the conduit of the washing water tube even if the operation lever is pushed down to some extent, but the suction tube is completely opened within the operation range. For this, it is necessary to make the distance from the fulcrum of the tube engaging portion of the suction tube sufficiently longer than the distance from the fulcrum of the tube engaging portion of the cleaning water tube. In that case, either the amount of pressing of the operating lever required to open the cleaning water tube becomes too large, or the operating amount of the operating lever required to open the suction tube becomes too small. Therefore, there is a problem that the operability is deteriorated.

  In the case of the above operation mechanism, the operation force when the operation lever is pushed down continuously changes with respect to the operation amount, so the suction tube is changed from the closed state to the open state (or from the open state to the closed state). The switching between the first stage operation to be switched and the second stage operation to switch the washing water tube from the closed state to the open state (or from the open state to the closed state) cannot be grasped from the operational feeling of the operation lever. There is a problem. Therefore, there is also a drawback that it is difficult to stop the operation when one tube is in an open state and the other tube is in a closed state.

  Further, instead of collecting the droplets and the like adhering to the observation window or the like by suction as in Patent Document 4, it is possible to inject and remove the gas as in Patent Document 1, and in that case as well, There is a similar problem.

  That is, a cleaning water tube for supplying cleaning water is connected to one of the two fluid supply passages of the sheath insertion portion, and an air supply tube for supplying a gas such as air is connected to the other, as in Patent Document 4. It is conceivable that only the gas is injected into the observation window by the first-stage operation of the control lever, and the mixed fluid of the gas and the washing water is injected by the second-stage operation. In this case, as described in Patent Document 3, jetting of the mixed fluid to the observation window is preferable because excellent cleaning performance can be obtained. In addition, enabling only the gas to be injected in the first stage operation means that the first stage operation must be performed when the mixed fluid is stopped after the second stage operation in which the mixed fluid is injected. Since only the gas is jetted by this, residual water such as an observation window can be blown away, which is preferable. Furthermore, when the second stage operation is performed, it is necessary to perform the first stage operation. Therefore, when the mixed fluid is ejected, only the gas is ejected. Not. Conversely, when it is desired to inject only the gas, there is a problem in injecting the mixed fluid, and in this respect as well, it is preferable to inject only the gas by the first stage operation. is there.

  However, in the case where the operation mechanism that realizes such an operation is performed by the operation mechanism described in Patent Document 4, it is difficult to completely open only the air supply tube, as described above. Therefore, there arises a problem that only the injection cannot be performed properly. In addition, there is a problem that it is difficult to grasp from the operational feeling of the operation lever the switching between the gas injection by the first stage operation and the mixed fluid injection by the second stage operation.

  The present invention has been made in view of such circumstances, and an open state in which the tube path is opened by pressing and releasing the tube for cleaning the observation window and the illumination window of the endoscope insertion portion and the tube. In an endoscope insertion assisting tool equipped with an operation mechanism that switches between a closed state in which a conduit is closed, the operation of the first stage of one operation member completes the conduit of one of the two tubes. The tube is open, the other tube is completely closed, and the second stage operation allows both tubes to open, and preferably 1 An object of the present invention is to provide an endoscope insertion assisting tool with good operability so that the switching between the operation of the step and the step of the second step can be grasped by an operational feeling.

  In order to achieve the above object, the present invention provides a hand operating section, and a tubular sheath inserting section having a lumen connected to the hand operating section and having a lumen inserted through an insertion section of an endoscope. In the endoscope insertion assisting tool provided with the first fluid conduit and the second fluid conduit communicating with the nozzle provided at the distal end portion, the hand operating portion includes the first fluid conduit, A first fixing member disposed along an insertion passage through which the first tube connected to one fluid conduit is inserted, and an insertion passage through which the second tube connected to the second fluid conduit is inserted. A first locking portion disposed opposite to the first fixing member with the first tube interposed therebetween, and the first locking portion presses the first tube. The pressing position and the non-pressing position where the first locking portion does not press the first tube. A first pressing member that is displaced between the second fixing member and a second locking portion that is disposed opposite to the second fixing member with the second tube interposed therebetween, and the second locking portion is the first locking member. A second pressing member that is displaced independently of the first pressing member between a pressing position that presses the two tubes and a non-pressing position where the second locking portion does not press the second tube; An operation member supported so as to be displaceable in a predetermined operation direction from a reference position at the time of non-operation in which the first pressing member and the second pressing member are set to the pressing position, the first pressing member in the operation direction from the reference position. At the first displacement position displaced by the displacement amount, the first pressing member is set to the non-pressing position and the second pressing member is set to the pressing position, and the second displacement amount is set in the operation direction from the first displacement position. In the displaced second displacement position, the first pressing member Fine said second pressing member is characterized by comprising an operation member to be set in the non-pressing position.

  According to the present invention, since the first pressing member and the second pressing member that press the first tube and the second tube are provided as members that are independently displaced, according to the amount of displacement of the operation member, The first pressing member and the second pressing member can be individually displaced to the pressing position and the non-pressing position. Therefore, an open state in which the pipe line of one tube (first tube) is completely opened by the first-stage operation of the operation member (operation from the reference position when not operated to the first displacement position), the other tube It is possible to set the closed state in which the pipe line of the (second tube) is completely closed. Note that when the second stage operation (operation from the first displacement position to the second displacement position) of the operation member is performed, both tubes can be set in the open state.

  In the present invention, when the operating member is displaced from the reference position to the first displacement position, the operating member contacts the first pressing member and presses the first pressing member, thereby causing the first pressing member to move. While displacing from the pressing position to the non-pressing position and not contacting the second pressing member, the second pressing member is held at the pressing position, and is displaced from the first displacement position to the second displacement position. When the first pressing member is pressed against the first pressing member, the first pressing member is held at the non-pressing position, and the second pressing member is contacted with the first pressing member. It is preferable that the second pressing member is displaced from the pressing position to the non-pressing position by pressing the two pressing members.

  According to this, the operation member is not in contact with the second pressing member during the first stage operation of the operating member that opens the first tube by displacing the first pressing member from the pressing position to the non-pressing position. The second pressing member is displaced from the pressing position to the non-pressing position so that the operation member comes into contact with the second pressing member during the second stage operation of the operation member that opens the second tube. The operating force required to operate the operating member changes discontinuously when the operation of the first stage and the second stage is switched. Therefore, it is possible to easily grasp the switching between the first stage operation and the second stage operation from the operational feeling of the operation member. In addition to the member that the operator directly touches, the operation member includes a member that connects the first pressing member and the second pressing member in conjunction with the operation member.

  In the present invention, it is preferable that the first pressing member and the second pressing member are urged from the non-pressing position toward the pressing position. According to this, when the operating member is not operated, the operating member does not apply force to the first pressing member and the second pressing member so that the pressing position is reached, and when the operating member is operated, Since it is only necessary to sequentially displace the first pressing member and the second pressing member to the non-pressing position, the structure for transmitting power between the operation member, the first pressing member, and the second pressing member is simplified. Can do.

  In the present invention, it is preferable that the operation member is a lever that is rotatably supported. According to this, both the first tube and the second tube are closed and only the first tube is opened (the second tube is closed) depending on the rotation position of one lever (the amount of rotation from the reference position). The first tube and the second tube can be switched to the open state.

  In the present invention, when the operating member is displaced from the reference position to the first displacement position, the operating member contacts the first pressing member from a state in which the operating member contacts the first pressing member and presses the first pressing member. By changing to a state where the first pressing member is not moved, the first pressing member is displaced from the pressing position to the non-pressing position, and the second pressing member is held in a pressed state by contacting the second pressing member. The first pressing member is held at the pressing position, and when the first pressing member is displaced from the first displacement position to the second displacement position, the first pressing member is held in a state of not contacting the first pressing member. While holding the member in the non-pressing position, the second pressing member is changed from a state in which the member is in contact with the second pressing member and the first pressing member is pressed into a state in which the member is not in contact with the first pressing member. Manner to displace the member from the pressing position to the non-pressing position is possible.

  According to this, at the time of the first stage operation of the operating member that opens the first tube by displacing the first pressing member from the pressing position to the non-pressing position, the operating member is the first pressing member and the second pressing member. The second pressing member is displaced from the pressing position to the non-pressing position and the second tube is opened to operate the second stage of the operating member, and the operating member is only the second pressing member. Therefore, the operation force required for operating the operation member changes discontinuously when the operation of the first stage and the second stage is switched. Therefore, it is possible to easily grasp the switching between the first stage operation and the second stage operation from the operational feeling of the operation member.

  In the present invention, the first pressing member and the second pressing member may be biased from the pressing position toward the non-pressing position. According to this, when the operating member is not operated, the first pressing member and the second pressing member are held at the pressing positions against the urging force, and when the operating member is operated, 2 The holding force for holding the pressing member at the pressing position may be sequentially released and displaced to the non-pressing position.

  In the present invention, it is possible to adopt a mode in which the operation member includes an arm supported so as to be movable in the longitudinal axis direction and biased in the direction of the reference position from the second displacement position. According to this, both the first tube and the second tube are closed, and only the first tube is opened (the second tube is closed), depending on the push-pull position of one arm (the amount of pulling from the reference position). The first tube and the second tube can be switched to the open state.

  In the present invention, it is desirable that the first fluid line is an air supply line or a suction line, and the second fluid line is a water supply line. According to this, air supply or suction can be executed by the first stage operation of the operation member, and air supply or suction and water supply can be executed by the second stage operation. Since it is desirable that there is a state in which only air supply or suction can be performed in cleaning the observation window or the illumination window, this mode is preferable.

  According to the present invention, by the first stage operation of one operation member, the open state in which one of the two tubes is completely opened, and the other tube is completely closed. It can be set to a state, and it can be made into the open state which opened both tubes completely by operation of the 2nd step.

Whole perspective view which shows the insertion auxiliary tool of 1st Embodiment with which the rigid endoscope was mounted | worn The perspective view which looked at the form of Drawing 1 from the lower part Assembly perspective view of the sheath insertion part constituting the insertion aid Sectional view showing a tube for a direct-view endoscope Sectional view showing a tubular body for a perspective endoscope Assembly perspective view showing configuration of collet chuck Cross-sectional view explaining air / water switching by forward operation of the air / water lever Cross-sectional view explaining air / water supply switching by reverse operation of air / water supply lever Sectional drawing explaining switching of air / water supply by turning operation of air / water supply lever Whole perspective view showing the insertion assisting tool of the second embodiment attached to the rigid endoscope The expanded perspective view which expanded the handle part of the insertion auxiliary tool of 2nd Embodiment, and showed the internal structure It is a simplified diagram showing the operation mechanism of the insertion assisting tool of the second embodiment, and shows a state when not operated FIG. 10 is a simplified diagram showing an operation mechanism of the insertion assisting tool according to the second embodiment, and shows a state in which one-step operation is performed. FIG. 10 is a simplified diagram showing an operation mechanism of the insertion assisting tool according to the second embodiment, and shows a state in which two-stage operation is performed. Overall perspective view showing an insertion assisting tool of the third embodiment attached to a rigid endoscope Overall perspective view showing the insertion assisting tool of the third embodiment attached to the rigid endoscope from a direction different from FIG. The expansion perspective view which expanded the handle part of the insertion auxiliary tool of a 3rd embodiment, and showed the internal structure The simplification figure which shows the operation mechanism of the insertion auxiliary tool of 3rd Embodiment Overall perspective view showing an insertion assisting tool of a fourth embodiment attached to a rigid endoscope The expansion perspective view which expanded the handle part of the insertion auxiliary tool of a 4th embodiment, and showed the internal structure The perspective view which expanded and showed only the rotary valve of the insertion auxiliary tool of 4th Embodiment. The perspective view which expanded and showed only the rotary valve of the insertion auxiliary tool of 4th Embodiment. Sectional drawing used for description of an effect | action of the rotary valve of the insertion auxiliary tool of 4th Embodiment Sectional drawing used for description of an effect | action of the rotary valve of the insertion auxiliary tool of 4th Embodiment Sectional drawing used for description of an effect | action of the rotary valve of the insertion auxiliary tool of 4th Embodiment Sectional drawing used for description of an effect | action of the rotary valve of the insertion auxiliary tool of 4th Embodiment

  Hereinafter, preferred embodiments of an endoscope insertion aid 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 endoscope insertion assisting tool (hereinafter referred to as an insertion assisting tool) 10 according to a first embodiment attached to a rigid endoscope 12, and FIG. It is the perspective view which looked at the form of from the bottom. FIG. 3 shows an assembled perspective view of the sheath insertion portion 14 constituting the insertion assisting tool 10.

  As shown in FIG. 3, the rigid endoscope 12 includes a main body portion 24 and an endoscope insertion portion 26 made of a rigid tube. A connector 28 protrudes from the main body 24. When the rigid endoscope 12 is used, the connector 28 is arranged to project upward from the U-shaped notch 34 of the main body 31 of the handle part (hand operation part) 30 constituting the insertion assisting tool 10 in FIG. . In this state, one end of the light guide cable 36 is connected to the connector 28, and the other end of the light guide cable 36 is connected to the external light source device 38.

  One end of a light guide (not shown) made of an optical fiber is fixed to the connector 28. The light guide is inserted and disposed in the endoscope insertion portion 26, and the other end of the light guide is extended so as to face the illumination window 40 provided on the distal end surface 27 of the endoscope insertion portion 26. . Therefore, the illumination light from the light source device 38 is guided to the illumination window 40 through the light guide cable 36 and the light guide, and is irradiated from the illumination window 40 to the observation site in the body cavity.

  An observation window 42 is provided on the distal end surface 27 of the endoscope insertion portion 26. The optical image of the observation site that has entered from the observation window 42 is imaged by an objective lens (not shown) on the imaging surface of an image guide (not shown) inserted and arranged in the endoscope insertion portion 26. The optical image is guided to the main body 24 through the image guide, and through an eyepiece 46 (see FIGS. 1 and 2) of the eyepiece 44 connected to the base end of the main body 24. Observed by the practitioner. In the present embodiment, the rigid endoscope 12 for observing the optical image of the observation site from the eyepiece unit 44 via the image guide is exemplified. However, the optical image is formed on the light receiving surface of the solid-state imaging device. Thus, an electronic endoscope that outputs an optical image as electronic image data may be used. Further, as shown in FIG. 1, by attaching a camera head 48 to the eyepiece 44 of the rigid endoscope 12 via an adapter 47, an optical image observed at the eyepiece 44 is converted into an electronic image by the camera head 48. It can also be converted to data and transmitted to a device such as a processor device to which a cable from the camera head 48 is connected.

  When the endoscope insertion portion 26 is inserted into the sheath insertion portion 14 to a predetermined position, the illumination window 40 and the observation window 42 of the endoscope insertion portion 26 are opened at the distal end opening (reference numeral in FIG. 3). 22) exposed.

  As shown in FIG. 2, the endoscope insertion portion 26 inserted into the sheath insertion portion 14 is fixed to the introduction tube 50 by a fastening operation of a collet chuck 52 provided on the introduction tube 50 of the sheath insertion portion 14. As a result, the insertion assisting tool 10 and the rigid endoscope 12 are fixed to each other to stabilize the treatment.

  The collet chuck 52 includes a collet portion 54 and a nut portion 56 as shown in FIG. The collet portion 54 includes three split grooves 58 formed at the proximal end portion of the introduction pipe 50 and a male screw 60 engraved on the surface of the proximal end portion of the introduction pipe 50. On the inner peripheral surface of the nut portion 56, a tapered female screw 62 that is screwed into the male screw 60 is formed. Therefore, when the female screw 62 of the nut portion 56 is screwed into the male screw 60 of the collet portion 54 and the nut portion 56 is rotated in the fastening direction, the collet portion 54 is pressed by the tapered female screw 62 to reduce its diameter, and the hard inner It is pressed by the endoscope insertion portion 26 of the endoscope 12. As a result, the insertion assisting tool 10 and the rigid endoscope 12 are fixed to each other by the collet chuck 52. The means for fixing the insertion assisting tool 10 and the rigid endoscope 12 may be a means other than the collet chuck 52.

  On the other hand, as shown in FIG. 3, the insertion assisting tool 10 is provided at the sheath insertion portion 14 as an outer tube into which the endoscope insertion portion 26 of the rigid endoscope 12 is inserted, and the proximal end portion of the sheath insertion portion 14. It is comprised from the handle | steering-wheel part 30 which a practitioner grasps and operates. The base end portion of the sheath insertion portion 14 is disposed through the support portion 64 provided in the main body 31 of the handle portion 30 and is integrally connected to the introduction tube 50 shown in FIG.

  As shown in FIG. 3, a lumen 16 into which the endoscope insertion portion 26 is inserted is formed in the sheath insertion portion 14 along the longitudinal axis A direction of the sheath insertion portion 14. Further, the diameter of the lumen 16 is slightly larger than the outer diameter of the endoscope insertion portion 26, the backlash of the endoscope insertion portion 26 with respect to the sheath insertion portion 14 hardly occurs, and the endoscope insertion portion. The size is such that 26 can be smoothly inserted into the sheath insertion portion 14. The sheath insertion portion 14 can be made of polyethylene, polypropylene, urethane, silicon, polyvinyl chloride, or the like, and is not limited to a specific material, but is preferably made of a resin when made disposable.

In addition, the sheath insertion portion 14 is formed with an air supply conduit 18 that is a fluid conduit and a water supply conduit 20 that is a fluid conduit in the longitudinal axis A direction. The air supply pipe 18 and the water supply pipe 20 are merged in the vicinity of the distal end portion of the sheath insertion portion 14, and the merge pipeline (not shown) communicates with a nozzle 68 provided at the distal end portion of the sheath insertion portion 14. Has been. The nozzle 68 is opened toward the center of the distal end opening 22 of the lumen 16. From the nozzle 68, feed air which has been supplied from the duct 18 (CO ₂ gas) and sending the air which has been supplied from the duct 18 and the water supply channel 20. (CO ₂ gas) and the washing water (the water) The mixed fluid is ejected. Therefore, the CO ₂ gas and the mixed fluid are switched and injected into the illumination window 40 and the observation window 42 of the endoscope insertion portion 26 inserted into the sheath insertion portion 14.

  Further, when the rigid endoscope 12 to which the sheath insertion portion 14 is attached is a direct-view rigid endoscope, the distal end opening 22 on the plane perpendicular to the longitudinal axis A as shown in FIG. What has is used. When the rigid endoscope 12 to which the sheath insertion portion 14 is attached is a perspective rigid endoscope, the sheath insertion portion 14 has a distal end opening 22 on a plane oblique to the longitudinal axis A as shown in FIG. Used. 4 and 5, reference numeral 25 denotes an observation window of the rigid endoscope 12 schematically shown.

  The air supply pipe 18 is opened to the outside through a port 70 shown in FIG. 6, and the water supply pipe 20 is opened to the outside through a port 72 shown in FIG.

One end of a gas supply tube 74 is connected to the port 70 as shown in FIG. This gas supply tube 74 is extended from the groove 76 provided in the main body 31 of the handle portion 30 to the outside through the opening 78 of the main body 31 shown in FIG. 3, and the other end is CO _{2 in} FIG. Connected to the supply device 80. Thereby, the CO ₂ gas from the CO ₂ supply device 80 is supplied to the nozzle 68 via the gas supply tube 74, the port 70, and the air supply pipe line 18.

  Further, one end of a liquid supply tube 82 is connected to the port 72 as shown in FIG. This liquid supply tube 82 is extended outside from the groove 84 provided in the main body 31 through the opening 86 of the main body 31 shown in FIG. 3, and the other end is connected to the water supply device 88 of FIG. The Thereby, water from the water supply device 88 is supplied to the nozzle 68 via the liquid supply tube 82, the port 72, and the water supply pipe line 20.

  In addition, since the gas supply tube 74 and the liquid supply tube 82 are fitted in the grooves 76 and 84 of the main body 31, respectively, the tubes 74 and 82 are difficult to be removed from the predetermined positions. , 82 is prevented from being touched, and troubles such as the tubes 74, 82 being detached from the ports 70, 72 are prevented.

The handle portion 30 of the insertion assisting tool 10 rotates the air / water supply lever 32 (pressing operation), thereby injecting CO ₂ gas from the nozzle 68 at the tip of the sheath insertion portion 14 and a mixed fluid (CO ₂ gas). And an operation mechanism for switching on / off the injection of water.

  As shown in FIG. 1 to FIG. 3, the air / water feeding lever 32 has a connector 28 of the rigid endoscope 12 inserted and arranged in the U-shaped notch 34 of the main body 31 inserted in the central portion on the front side. 32A, and a pair of leg portions 32B and 32C disposed on the left and right sides of the opening 32A. A shaft protrudes from the tip of each leg 32B, 32C toward the inner side in the left-right direction at a position on the same axis, and these shafts are formed in a bearing hole formed through the body 31 in the left-right direction. It is inserted and pivotally supported. Thereby, the air / water supply lever 32 is supported rotatably about the position of the bearing hole of the main body 31 as a rotation axis.

  The air / water supply lever 32 includes a pressing portion 32D to which a practitioner applies a pressing force at the rear end, and an inclined portion 32E that connects the leg portions 32B and 32C and the pressing portion 32D. . The pressing portion 32D is disposed along a substantially parallel plane passing through an upper position far from the longitudinal axis A of the sheath insertion portion 14 with respect to the plane along which the pair of leg portions 32B and 32C is along, and the inclined portion 32E is It arrange | positions along the plane which cross | intersects those planes. The inclined portion 32E is formed with an opening portion 32F communicating with the opening portion 32A.

  When the insertion assisting tool 10 is attached to the rigid endoscope 12 or when the insertion assisting tool 10 is removed from the rigid endoscope 12, the opening portion 32F is used by the connector 28 of the rigid endoscope 12 for air supply and water supply. A passage is formed that enters the U-shaped notch 34 of the main body 31 from the rear side of the lever 32 or exits from the U-shaped notch 34 to the rear side of the air / water feeding lever 32.

  The operation mechanism closes the tube by closing (closing) the tube by pressing (crushing) the tube against each of the gas supply tube 74 and the liquid supply tube 82 by the rotation operation of the air supply / insertion lever 32. It is configured to switch between a state and an open state in which the tube pressure (crush) is released and the tube line is opened.

  7 and 8 are schematic cross-sectional views showing components of the operation mechanism from the rear side, and FIG. 9 is a schematic cross-sectional view shown from the side. As shown in FIGS. 7A to 7C and FIGS. 8A to 8C, the gas supply tube 74 is pressed (collapsed) by the rod-shaped stopper 90 in the groove 76 in the main body 31 of the handle portion 30. ) And the release thereof, whereby the pipe of the gas supply tube 74 is closed or opened. Similarly, the liquid supply tube 82 is pressed and released by the rod-shaped stopper 92 in the groove 84, whereby the conduit of the liquid supply tube 82 is closed or opened.

  The stopper 90 is configured by bending one end portion extended from the torsion coil spring 94 at a right angle. Similarly, the stopper 92 is configured by bending one end portion extended from the torsion coil spring 96 at a right angle.

  The torsion coil springs 94 and 96 are externally mounted on a shaft 98 that rotatably supports the air / water supply lever 32 on the main body 31, and the other end portions are engaged with the shaft 98. When the air / water supply lever 32 shown in FIGS. 7A, 8C, and 9A is not operated, the stoppers 90 and 92 are biased by the torsion coil springs 94 and 96. The stopper 90 presses and closes the gas supply tube 74, and the stopper 92 presses and closes the liquid supply tube 82. That is, both the gas supply tube 74 and the liquid supply tube 82 are closed.

In this state, as shown in FIG. 9B, when the air / water supply lever 32 is rotated clockwise about the shaft 98, the pressing member 100 protruding from the back surface of the air / water supply lever 32 is provided. 7A to 7B, the stopper 90 is pushed down against the urging force of the torsion coil spring 94. Thereby, the pipeline of the gas supply tube 74 is opened as shown in FIG. In the state shown in FIG. 7B, the liquid supply tube 82 is in a closed state in which the conduit is closed by being pressed by the stopper 92. Therefore, only CO ₂ gas is injected from the nozzle 68 at the distal end of the sheath insertion portion 14 shown in FIG.

Further, when the air / water supply lever 32 is rotated in the clockwise direction around the shaft 98, the pressing member 102 protruding from the back surface of the air / water supply lever 32 is shown in FIG. As shown in FIG. 7C, the stopper 92 is pushed down against the biasing force of the torsion coil spring 96. Thereby, the conduit of the liquid supply tube 82 is opened as shown in FIG. Accordingly, since the liquid supply tube 82 is also opened after the gas supply tube 74, a mixed fluid of CO ₂ gas and cleaning water is ejected from the nozzle 68 at the distal end of the sheath insertion portion 14. 7A, the pressing member 102 is not in contact with the torsion coil spring 96 in the range of the operation position of the air / water supply lever 32 until the gas supply tube 74 is changed from the closed state to the open state. As shown in FIG. 7B, the torsion coil spring 96 is brought into contact with at least the gas supply tube 74 in the open state in which the conduit is completely opened.

Actual operation during treatment, first, by rotating the air water lever 32 to the position shown in FIG. 7 (B) from the position of FIG. 7 (A), an illumination window 40 and observation of the CO ₂ gas from the nozzle 68 It sprays on the window 42 and blows off blood, body fluid, etc. adhering to the illumination window 40 and the observation window 42.

  Next, the air / water supply lever 32 is rotated from the position shown in FIG. 7B to the position shown in FIG. 7C, and the mixed fluid is ejected from the nozzle 68 to the illumination window 40 and the observation window 42 to illuminate. The window 40 and the observation window 42 are cleaned.

Then, by rotating in the opposite direction the air water lever 32 from the position shown in FIG. 8 (A) (same as the position of FIG. 7 (C)) to the position in FIG. 8 (B), CO ₂ gas from the nozzle 68 Is sprayed onto the illumination window 40 and the observation window 42 to dry the illumination window 40 and the observation window 42. Thereafter, the air / water supply lever 32 is returned from the position of FIG. 8B to FIG. 8C (same as the position of FIG. 7A), and the supply of CO ₂ gas is stopped. The operation procedure of the air / water supply lever 32 has been described above.

According to the insertion assisting tool 10 of the first embodiment described above, the injection of CO ₂ gas from the nozzle 68 and the injection of the mixed fluid are turned on by the rotation operation (pressing operation) of only the air / water supply lever 32. / Off can be switched. In addition, since the stopper 90 that presses the gas supply tube 74 and the stopper 92 that presses the liquid supply tube 82 can be displaced independently, the stopper 90 and The position at which the stopper 92 is pushed down (released) is adjusted by the length of the pressing members 100 and 102 (the height of the portion where each of the pressing members 100 and 102 contacts the torsion coil springs 94 and 96). be able to. Therefore, in the state where the gas supply tube 74 is completely opened by the first operation of the air / water supply lever 32, it is easy to maintain the liquid supply tube 82 in the completely closed state. It becomes possible. In addition, the structure is not complicated and there are few components, and it can be manufactured at low cost and is easy to operate.

Further, when the air supply / water supply lever 32 for opening the pipe of the gas supply tube 74 is operated at the first stage, the pressing member 102 does not contact the torsion coil spring 96 and the pipe of the liquid supply tube 82 is opened. If you start the second stage of operation is initiated, to initiate the pressing of the stopper 92 in contact with the coil spring 96 pressing member 102 is torsional, first stage and the operation for injecting only the CO ₂ gas, mixed When the operation of the second stage for ejecting fluid is switched, the operating force of the air / water supply lever 32 changes discontinuously. Therefore, it is possible to easily grasp the switching between the first stage operation and the second stage operation from the operational feeling.

When the air supply / water supply lever 32 is rotated between the positions shown in FIGS. 7A and 7B and the gas supply tube 74 is slightly opened, a small amount of CO ₂ gas is generated from the nozzle 68. It is injected into the illumination window 40 and the observation window 42. Thus, the front surface of the illumination window 40 and observation window 42, the gas curtain by CO ₂ gas is formed, can be reduced fouling of the illumination window 40 and observation window 42.

Further, a suction device is connected to the gas supply tube 74 instead of the CO ₂ supply device 80 so that dirt and droplets on the illumination window 40 and the observation window 42 are sucked instead of being blown off with CO ₂ gas. Good. Further, the gas supply tube 74 and the liquid supply tube 82 may be used for purposes other than supplying CO ₂ gas or cleaning water. The same applies to other tubes described below as gas supply tubes and liquid supply tubes for supplying CO ₂ gas and cleaning water.

  Next, an insertion assisting tool according to the second embodiment will be described. FIG. 10 is an overall perspective view showing the insertion assisting tool 150 of the second embodiment attached to the rigid endoscope 12, and FIG. 11 is a handle of the insertion assisting tool 150 of the second embodiment. It is the expansion perspective view which expanded the part and showed the internal structure. In addition, the same code | symbol is attached | subjected to the component which is the same as that of the insertion assistance tool 10 of 1st implementation and the rigid endoscope 12, or similar, and detailed description is abbreviate | omitted.

  As shown in FIGS. 10 and 11, the insertion assisting tool 150 according to the second embodiment includes a sheath insertion portion 14 into which the endoscope insertion portion 26 of the rigid endoscope 12 is inserted, and a practitioner grasping the insertion aid 150. And a handle portion 152 to be operated.

  The sheath insertion portion 14 is fixed to the handle portion 152 by fitting a base end portion into a hole of a cylindrical portion 155 protruding from the front surface of the main body case 154 of the handle portion 152.

  In the sheath insertion portion 14, an unillustrated air supply conduit 18 and a water supply conduit 20 are formed in the longitudinal axis A direction, similarly to the insertion assisting tool 10 of the first embodiment. As shown in FIG. 11, the proximal end side of the air supply duct 18 is connected to a port 70 projecting from the inner space of the main body case 154 through a hole in the peripheral wall portion of the main body case 154 of the handle portion 152. Is opened to the internal space of the main body case 154. Similarly, the water supply conduit 20 is connected to a port 72 projecting from the internal space of the main body case, and is opened to the internal space of the main body case 154 via the port 72.

One end of a gas supply tube 74 is connected to the port 70. The gas supply tube 74 passes through the lower surface side of the support plate 156 via the opening 156A of the support plate 156 disposed in the main body case 154, and passes through the tube guide groove 158 and the opening 160 of the main body case 154. The case 154 extends outside the rear side. The other end of the gas supply tube 74 is connected to the CO ₂ supply device 80 shown in FIG. Thereby, the CO ₂ gas from the CO ₂ supply device 80 is supplied to the nozzle 68 at the distal end of the sheath insertion portion 14 via the gas supply tube 74, the port 70, and the air supply pipe 18.

  Further, one end of a liquid supply tube 82 is connected to the port 72. The liquid supply tube 82 passes through the lower surface side of the support plate 156 via the opening 156A of the support plate 156 disposed in the main body case 154, and passes through the tube guide groove 162 and the opening 164 of the main body case 154. The case 154 extends outside the rear side. The other end of the liquid supply tube 82 is connected to the water feeding device 88 shown in FIG. As a result, the cleaning water from the water supply device 88 is supplied to the nozzle 68 at the distal end of the sheath insertion portion 14 via the liquid supply tube 82, the port 72, and the water supply conduit 20.

  The handle portion 152 includes a main body case 154 that surrounds the outer periphery excluding the lower side with a peripheral wall portion. In the main body case 154, the handle portion 152 is rigid at the positions of the front and rear peripheral wall portions that intersect the longitudinal axis A of the sheath insertion portion 14. Openings 166 and 166 through which the endoscope insertion portion 26 of the endoscope 12 is inserted into the lumen 16 of the sheath insertion portion 14 are formed. The insertion assisting tool 150 is attached to the rigid endoscope 12 by inserting the endoscope insertion portion 26 into the lumen 16 of the sheath insertion portion 14 from the rear side of the main body case 154 through these openings 166 and 166. It has become.

Further, the handle portion 152 is turned on by injecting the CO ₂ gas from the nozzle 68 at the tip of the sheath insertion portion 14 and the injection of the mixed fluid (CO ₂ gas and water) by pushing and pulling the air / water feeding arm 170. An operation mechanism that switches between (execution) and off (stop) is provided.

  As shown in FIGS. 10 and 11, a longitudinal air supply / water supply arm extending substantially parallel to the front-rear direction (longitudinal axis A direction of the sheath insertion portion 14) is provided below the main body case 154 of the handle portion 152. 170 is arranged. The air / water supply arm 170 can be pushed and pulled in the front-rear direction. As shown in FIG. 10, a practitioner inserts a finger into the rear end portion for air / water supply. A ring 172 for pushing and pulling the arm 170 is provided. The front end of the air / water supply arm 170 is fixed to the guide portion 176 of the moving body 174 as shown in FIG.

  The moving body 174 is housed inside the main body case 154 except for a part thereof, and a plate-like guide portion 176 arranged in the vertical direction and a plate-like support portion 178 arranged in the horizontal direction are integrated. Formed and configured.

  A guide shaft 180 extending in the front-rear direction fixed to the rear peripheral wall portion is provided inside the main body case 154, and a hole (not shown) through which the guide shaft 180 is inserted is formed in the guide portion 176. Has been. Therefore, the movable body 174 is supported by the guide shaft 180 so as to be movable in the front-rear direction by inserting the guide shaft 180 through the hole of the guide portion 176.

  A coil spring 182 is externally mounted on the guide shaft 180, and the coil spring 182 is disposed between the rear surface of the guide portion 176 of the moving body 174 and the rear wall surface of the main body case 154. The coil spring 182 is at least compressed more than its natural length, and always urges the moving body 174 toward the front side.

  The lower side of the main body case 154 is opened, and the lower end portion of the guide portion 176 extends to the lower outer side of the main body case 154 through the opening. The front end portion of the air / water feeding arm 170 is fixed to that portion. Accordingly, by pushing and pulling the air / water feeding arm 170, the moving body 174 moves in the front-rear direction. When the air / water feeding arm 170 is not operated, the position that is the frontmost side of the movable range of the movable body 174 by the biasing force of the coil spring 182, for example, the front end of the support portion 178 of the movable body 174 is the main body case 154. It stops at a position where it abuts on the front peripheral wall surface.

  On the upper surface of the support portion 178, a protrusion 184 extending in the left-right direction is formed to project. The upper end portion of the ridge portion 184 is formed in an R shape. The protrusion 184 moves in the front-rear direction along with the movement of the moving body 174.

  On the other hand, a fixing portion 186 in which the tube guide grooves 158 and 162 are formed is fixed inside the main body case 154, and extends from the front surface of the fixing portion 186 to the front side below the support plate 156. Two swing plates 188 and 190 are arranged side by side. These swinging plates 188 and 190 are fixed to the fixed part 186 only at the rear end, and are supported so as to be swingable in the vertical direction with the rear end as a fulcrum by elastic deformation.

  Each of the swing plates 188 and 190 is formed in a shape obtained by bending a flat plate-like body at two locations, and includes base end portions 188A and 190A, inclined portions 188B and 190B, and tip portions 188C and 190C, respectively. It is composed of The base end portion 188A and the tip end portion 188C of the swing plate 188 are disposed at positions along two parallel planes having different vertical positions, and the tip end portion 188C is positioned below the base end portion 188A. Has been placed. The inclined portion 188B is a portion that connects the base end portion 188A and the tip end portion 188C, and is disposed along a plane that intersects two planes along which the base end portion 188A and the tip end portion 188C are along. The proximal end portion 190A, the inclined portion 190B, and the distal end portion 190C of the swing plate 190 have the same arrangement as that of the swing plate 188.

  On the other hand, the positions where the inclined portions 188B and 190B are formed are different between the swing plate 188 and the swing plate 190, and the inclined portion 188B of the swing plate 188 is more than the inclined portion 190B of the swing plate 190. It is formed at a position on the front side. The operation will be described later.

  On the upper surfaces of the swing plates 188 and 190, protrusions (stoppers) 192 and 194 extending in the left-right direction are formed so as to protrude substantially at the same position in the front-rear direction. The upper ends of these stoppers 192 and 194 are formed in an R shape. The stopper 192 of the swing plate 188 is formed on the upper surface of the base end portion 188A, and the stopper 194 of the swing plate 190 is formed on the upper surface of the distal end portion 190C.

  The front end portions 188C and 190C of the swing plates 188 and 190 are disposed at positions where they contact the protrusions 184 formed on the support portion 178 of the moving body 174, and the air / water supply arm 170 is not operated. In this case, when the moving body 174 is disposed at the most front side position, the movable body 174 comes into contact with the protrusion 184 and the swinging plates 188 and 190 are pushed upward from the horizontal state. That is, the rocking plates 188 and 190 are pushed up and held by the protrusion 184 in a state of being biased in a downward direction that is in a horizontal state. On the other hand, when the air / water feeding arm 170 is pulled, the moving body 174 moves rearward so that the tip portions 188C and 190C do not come into contact with the protruding portion 184, and the swing plates 188 and 190 become horizontal. Therefore, by moving the moving body 174 in the front-rear direction by pushing and pulling the air / water supply arm 170, the swing plates 188, 190 swing up and down, and the stoppers 192, 194 also move up and down accordingly. It is designed to move up and down.

  As described above, on the lower side of the support plate 156, the gas supply tube 74 and the liquid supply tube 82 are arranged in parallel while being guided by the tube guide grooves 158 and 162 of the fixed portion 186, respectively. The gas supply tube 74 is disposed between the support plate 156 and the stopper 192, and the liquid supply tube 82 is disposed between the support plate 156 and the stopper 194. Therefore, when the stopper 192 is moved up and down by pushing and pulling the air / water feeding arm 170, the stopper 192 presses (crushes) the gas supply tube 74 and releases it. Is closed or opened. Similarly, when the stopper 194 moves up and down by pushing and pulling the air / water supply lever, the stopper 194 presses (crushes) and releases the liquid supply tube 82, and thereby the conduit of the liquid supply tube 82. Is closed or opened.

  The operation of the operation mechanism will be described with reference to FIGS. 12A to 14A show the support plate 156, the gas supply tube 74, the fixed portion 186, the swing plate 188, the stopper 192 on the swing plate 188, and the movable body 174 shown in FIG. Portion 178), and a simplified view showing the arrangement of the protrusion 184 of the moving body 174 from the left side. FIG. 12 to FIG. 14B show the support plate 156, the liquid supply tube 82, the fixing portion 186, and the swinging. FIG. 6 is a simplified diagram showing the arrangement of the plate 190, the stopper 194 on the swinging plate 190, the moving body 174 (supporting portion 178), and the protrusion 184 of the moving body 174 from the left side.

  When the air / water feeding arm 170 is not operated, the moving body 174 is set to the frontmost position by the urging force of the coil spring 182. At this time, as shown in FIGS. 12A and 12B, the protrusion 184 of the moving body 174 abuts against the tip portions 188C and 190C of the swing plates 188 and 190, and the stoppers 192 and 194 are pushed upward. It is in the state that was. As a result, the stopper 192 presses the gas supply tube 74 as shown in FIG. 12A to close the conduit, and the stopper 194 presses the liquid supply tube 82 as shown in FIG. Blocked. That is, both the gas supply tube 74 and the liquid supply tube 82 are closed.

When the air / water feeding arm 170 is pulled to the rear side from this state, the moving body 174 moves to the rear side, and the protrusion 184 of the moving body 174 moves to the swing plate 188 as shown in FIG. It moves from a position where it abuts on the tip 188C to a position where it abuts on the inclined portion 188B, and further moves to a position where it does not abut on any part of the swing plate 188. As a result, the stopper 192 is lowered, the pressure of the gas supply tube 74 is released, and the pipeline of the gas supply tube 74 is completely opened. Immediately after the gas supply tube 74 is completely opened, the liquid supply tube 82 is pressed by the stopper 194 and closed in a closed state as shown in FIG. 13B. Therefore, only CO ₂ gas is injected from the nozzle 68 at the distal end of the sheath insertion portion 14.

Further, when the air / water feeding arm 170 is pulled to the rear side, the moving body 174 further moves to the rear side, and the protrusion 184 of the moving body 174 is moved to the swing plate as shown in FIG. It moves from a position where it contacts the tip 190C of the 190 to a position where it contacts the inclined part 190B, and further moves to a position where it does not contact any of the swinging plates 190. As a result, the stopper 194 is lowered, the pressure of the liquid supply tube 82 is released as shown in FIG. 14B, and the conduit of the liquid supply tube 82 is completely opened. Accordingly, since the liquid supply tube 82 is opened after the gas supply tube 74, a mixed fluid of CO ₂ gas and water is ejected from the nozzle 68 of the sheath insertion portion 14.

  14A and 14B in which both the gas supply tube 74 and the liquid supply tube 82 are opened, the air / water supply arm 170 is gradually pushed back to the non-operating state. As shown in FIGS. 13A and 13B, after the liquid supply tube 82 changes to the closed state while the gas supply tube 74 is open, the gas is supplied as shown in FIGS. 12A and 12B. Both the tube 74 and the liquid supply tube 82 are closed.

According to the insertion assisting tool 150 of the second embodiment described above, ON / OFF of the injection of the CO ₂ gas from the nozzle 68 and the injection of the mixed fluid is switched by pushing and pulling only the air / water supply arm 170. be able to. Further, since the stopper 192 (oscillating plate 188) for pressing the gas supply tube 74 and the stopper 194 (oscillating plate 190) for pressing the liquid supply tube 82 can be displaced independently, air supply / water supply The position where the stopper 192 and the stopper 194 start to be lowered (release of pressing) can be adjusted by the position of the inclined portions 188B and 190B of the swing plates 188 and 190 with respect to the pushing and pulling operation of the arm 170. . Therefore, in a state where the gas supply tube 74 is completely opened by the first stage operation of the air / water supply arm 170, it is easy to maintain the state where the liquid supply tube 82 is completely closed. It becomes possible.

In addition, when the first stage operation of the air / water supply arm 170 that opens the pipe of the gas supply tube 74 ends, and the second stage operation that starts to open the pipe of the liquid supply tube 82 starts. to, from the state where protrusions 184 of the mobile 174 has been pushed in contact with both the wobble plate 188 and 190, for switching to a state not in contact with the swing plate 188, one stage for injecting the CO ₂ gas only In the switching between the eye operation and the second stage operation for injecting the mixed fluid, the operation force of the air / water supply arm 170 changes discontinuously. Therefore, it is possible to easily grasp the switching between the first stage operation and the second stage operation from the operational feeling.

  Next, the insertion assistance tool of 3rd Embodiment is demonstrated. In addition, the insertion assistance tool of 3rd and 4th embodiment demonstrated below is shown as a reference example instead of embodiment corresponding to this invention.

  15 and 16 are general perspective views showing the insertion assisting tool 220 of the third embodiment attached to the rigid endoscope 200 from different angles, and FIG. 17 is a perspective view of the third embodiment. It is the expansion perspective view (sectional view) which expanded the handle | steering-wheel part of the insertion assistance tool 220, and showed the internal structure. In addition, the same code | symbol is attached | subjected to the component which is the same as that of the insertion assistance tool 10 of 1st implementation and the rigid endoscope 12, or similar, and detailed description is abbreviate | omitted.

  The rigid endoscope 200 shown in FIGS. 15 to 17 is a so-called electronic endoscope, and is different from the rigid endoscope 12 described in the first and second embodiments. Yes. In the rigid endoscope 200, an observation image captured from the observation window 42 of the endoscope insertion unit 26 configured similarly to the rigid endoscope 12 is converted into electronic image data by a solid-state imaging device mounted on the main body 202. The electronic image data is transmitted to a processor device (not shown) connected by a universal cable 204 extending from the main body 202. Then, the electronic image data is processed by the processor device, and the observation image is observed on a monitor connected to the processor device.

  The universal cable 204 also includes a light guide in addition to an electrical cable for transmitting electronic image data and the like to the processor device. By connecting the light source device to the universal cable 204, the illumination light from the light source device is received. It is irradiated from the illumination window 40 of the endoscope insertion portion 26. Therefore, the connector 28 for connecting the light guide like the rigid endoscope 12 shown in the first and second embodiments is not provided. The main body 202 is provided with operation buttons 206 and 208 related to shooting control such as a shutter button. However, the insertion assisting tool 220 of the third embodiment can be easily attached to the rigid endoscope 12 as shown in the first and second embodiments, and The insertion assisting tools of the first and second embodiments can be easily mounted on the rigid endoscope 200 as shown in the third embodiment.

  As shown in FIGS. 15 and 16, the insertion assisting tool 220 according to the third embodiment is grasped by the operator and the sheath insertion portion 14 into which the endoscope insertion portion 26 of the rigid endoscope 200 is inserted. It is comprised from the handle part 222 to operate.

  The sheath insertion portion 14 is fixed to the main body case 224 with a base end portion fitted in a hole of a cylindrical portion 225 protruding from the front surface of the main body case 224 of the handle portion 222.

  The sheath insertion portion 14 includes an air supply pipe 18 (not shown) and a water supply pipe 20 (not shown) in the longitudinal axis A direction as in the insertion assisting tool 10 of the first and second embodiments. Is formed. The proximal end side of the air supply duct 18 is connected to a port 70 (not shown) projecting from the inner space of the main body case 224 through a hole in the peripheral wall portion of the main body case 224 of the handle portion 222, and is connected via the port 70. Open to the internal space of the main body case 224. Similarly, the water supply pipe 20 is connected to a port 72 (not shown) protruding from the internal space of the main body case, and is opened to the internal space of the main body case 224 via the port 72.

One end of a gas supply tube 74 is connected to the port 70. As shown in FIG. 17, the gas supply tube 74 passes through a tube guide groove 226 formed in the main body case 224 and an opening (not shown) of the main body case 224 and extends outside the rear side of the main body case 224. The A housing frame 228 for housing the main body 202 of the rigid endoscope 200 is fixed to the body case 224 outside the rear side of the body case 224, as shown in FIGS. 15 and 16. A tube guide groove 230 is provided. The gas supply tube 74 extended to the outside of the rear side of the main body case 224 passes through the tube guide groove 230 and extends to the outside of the housing frame 228, and the other end of the gas supply tube 74 is shown in FIG. Connected to the CO ₂ supply device 80. Thereby, the CO ₂ gas from the CO ₂ supply device 80 is supplied to the nozzle 68 at the distal end of the sheath insertion portion 14 via the gas supply tube 74, the port 70, and the air supply pipe 18.

  Further, one end of a liquid supply tube 82 is connected to the port 72. As shown in FIG. 17, the liquid supply tube 82 passes through a tube guide groove 232 formed in the main body case 224 and an opening (not shown) of the main body case 224, and extends outside the rear side of the main body case 224. The Then, like the gas supply tube 74, it passes through the tube guide groove 230 in the storage frame 228 and extends to the outside of the storage frame 228, and the other end of the liquid supply tube 82 is connected to the water feeding device 88 shown in FIG. Connected. Thereby, water from the water supply device 88 is supplied to the nozzle 68 via the liquid supply tube 82, the port 72, and the water supply pipe line 20.

  The handle portion 222 includes a main body case 224 that surrounds the entire outer periphery with a peripheral wall portion, and a storage frame 228 that is fixed to the rear side of the main body case 224. The body case 224 has an opening (not shown) through which the endoscope insertion portion 26 of the rigid endoscope 200 is inserted into the lumen 16 of the sheath insertion portion 14 at a position intersecting the longitudinal axis A of the sheath insertion portion 14. Is formed. By inserting the endoscope insertion portion 26 into the lumen 16 of the sheath insertion portion 14 from the rear side of the main body case 224 through this opening, the main body portion 202 of the rigid endoscope 200 is fitted into the housing frame 228. Fixed. Thereby, the insertion assisting tool 220 is attached to the rigid endoscope 200.

Further, the handle portion 222 has an operation mechanism for switching ON / OFF of the injection of CO ₂ gas from the nozzle 68 at the distal end of the sheath insertion portion 14 and the injection of cleaning water by pressing the air supply button 234 and the water supply button 236. I have.

  As shown in FIGS. 15 to 17, an air supply button 234 and a water supply button 236 are arranged on the upper side of the main body case 224 of the handle portion 222. As shown in FIG. 17, the air supply button 234 is supported by a support portion 244 formed by extending one end of a torsion coil spring 240 supported in the main body case 224.

  The torsion coil spring 240 is externally mounted on a boss 246 that protrudes into the main body case 224, and one end of the torsion coil spring 240 is held in contact with a restriction plate 248 that protrudes in the biasing direction that acts on the end. Has been. The other end portion of the torsion coil spring 240 is extended to a position where it is fixed to the air supply button 234, and in the extended portion, a stopper portion 242 extending in the left-right direction and a right angle with respect to the stopper portion 242. A support portion 244 that is bent and extends in the vertical direction is formed.

  The stopper portion 242 is biased upward by the torsion coil spring 240, and the upward movement of the stopper plate 250 is restricted by the restricting plate 250 that is formed to project from the rear side of the tube guide groove 226. .

  The support part 244 is inserted through a through-hole 252 formed in the upper part of the main body case 224, has an end protruding from the upper side of the main body case 224, and an air supply button 234 is fixed to the end.

  When the air supply button 234 is not operated, the stopper portion 242 is held at a position regulated by the regulating plate 250 by the urging force of the torsion coil spring 240. On the other hand, when the air supply button 234 is pushed down against the urging force of the torsion coil spring 240, the stopper portion 242 is pushed downward via the support portion 244 and lowered.

  As described above, the gas supply tube 74 is arranged so as to be guided by the tube guide groove 226 and pass between the restriction plate 250 and the stopper portion 242. Therefore, when the stopper portion 242 is moved up and down by the pressing operation of the air supply button 234, the stopper 242 presses (crushes) the gas supply tube 74 and releases it, whereby the pipeline of the gas supply tube 74 is opened. Switching is made between a closed state where the tube is closed and an open state where the pipe is opened.

  Switching of the open / close state of the liquid supply tube 82 by pressing the water supply button 236 is also performed by the same mechanism as the switching of the open / close state of the gas supply tube 74. The water supply button 236 is supported by a support portion 264 formed by extending one end of a torsion coil spring 260 supported in the main body case 224.

  The torsion coil spring 260 is externally mounted on a boss 266 projectingly formed in the main body case 224, and one end of the torsion coil spring 260 is disposed on the lower inner surface 267 of the peripheral wall portion of the main body case 224 disposed in the biasing direction. Is held in contact with the The other end portion of the torsion coil spring 260 is extended to a position where it is fixed to the water supply button 236, and the extended portion is bent at right angles to the stopper portion 262 extending in the left-right direction and the stopper portion 262. And a support portion 264 extending in the vertical direction.

  The stopper portion 262 is biased upward by the torsion coil spring 260, and the upward movement of the stopper plate 270 is restricted by the restricting plate 270 formed to project from the rear side of the tube locking groove 232. Yes.

  The support part 264 is inserted through a through-hole 272 formed in the upper part of the main body case 224 and has an end protruding from the upper side of the main body case 224, and a water feed button 236 is fixed to the end.

  When the water supply button 236 is not operated, the stopper portion 262 is held at a position regulated by the regulating plate 270 by the urging force of the torsion coil spring 260. On the other hand, when the water supply button 236 is pushed down against the urging force of the torsion coil spring 260, the stopper portion 262 is pushed downward via the support portion 264 and lowered.

  As described above, the liquid supply tube 82 is disposed so as to be guided by the tube guide groove 232 and pass between the regulation plate 270 and the stopper portion 262. Therefore, when the stopper 262 moves up and down by the pressing operation of the water supply button 236, the stopper 262 presses (crushes) the liquid supply tube 82 and releases it, thereby closing the conduit of the liquid supply tube 82. It is possible to switch between the closed state and the open state in which the pipe line is opened.

  The operation of the operation mechanism will be described with reference to FIG. 18 shows the air supply button 234, the water supply button 236, the torsion coil springs 240 and 260, the stopper portions 242 and 262 of the torsion coil springs 240 and 260, the support portions 244 and 264, the restriction plate 248, shown in FIG. 250 and 270 are simplified views showing the arrangement of the lower inner surface 267 of the peripheral wall portion of the main body case 224 from the rear side.

  As shown in FIG. 18A, when the air supply button 234 and the water supply button 236 are not operated, the stopper portions 242 and 262 are regulated by the regulating plates 250 and 270 by the urging force of the torsion coil springs 240 and 260. The stopper portion 242 presses the gas supply tube 74 to close the conduit, and the stopper portion 262 presses the liquid supply tube 82 to close the conduit. That is, both the gas supply tube 74 and the liquid supply tube 82 are closed.

When only the air supply button 234 is pushed down from this state as shown in FIG. 18B, the stopper portion 242 is lowered and the pressure of the gas supply tube 74 is released. As a result, the gas supply tube 74 is opened and opened, and CO ₂ gas is injected from the nozzle 68 at the distal end of the sheath insertion portion 14.

  On the other hand, when only the water supply button 236 is pushed down as shown in FIG. 18C, the stopper portion 262 is lowered and the pressure of the liquid supply tube 82 is released. Thereby, the conduit of the liquid supply tube 82 is opened and opened, and cleaning water is jetted from the nozzle 68 at the distal end of the sheath insertion portion 14.

On the other hand, when both the air supply button 234 and the water supply button 236 are pushed down as shown in FIG. 18D, the stopper portion 242 and the stopper portion 262 are lowered, and both the gas supply tube 74 and the liquid supply tube 82 are connected. It is opened to enter an open state, and a mixed fluid of CO ₂ gas and washing water is ejected from the nozzle 68 at the distal end of the sheath insertion portion 14.

According to the insertion assisting tool 220 of the third embodiment described above, two button operations of the air supply button 234 and the water supply button 236 are required. In addition to injecting the CO ₂ gas and the mixed fluid from the nozzle 68, It is possible to inject only water.

  Next, the insertion assistance tool of 4th Embodiment is demonstrated. FIG. 19 is an overall configuration diagram showing the insertion assisting tool 300 of the third embodiment attached to the rigid endoscope 200, and FIG. 20 shows the insertion assisting tool 300 of the fourth embodiment. It is the expansion perspective view which expanded the handle | steering-wheel part and showed the internal structure. In addition, the same code | symbol is attached | subjected to the component which is shown in the insertion auxiliary tool 10 of 1st Embodiment and 3rd Embodiment, and is the same as or similar to the rigid endoscope 200, and detailed description is abbreviate | omitted.

  As shown in FIGS. 19 and 20, the insertion assisting tool 300 according to the fourth embodiment includes a sheath insertion portion 14 into which the endoscope insertion portion 26 of the rigid endoscope 200 is inserted and held by a practitioner. And a handle portion 302 to be operated.

  The sheath insertion portion 14 is fixed to the handle portion 302 with a base end portion fitted in a hole of a cylindrical portion 306 protruding from the front surface of the main body case 304 of the handle portion 302.

  In the sheath insertion portion 14, an unillustrated air supply conduit 18 and a water supply conduit 20 are formed in the longitudinal axis A direction, similarly to the insertion assisting tool 10 of the first embodiment. The proximal end side of the air supply duct 18 is connected to a port 70 projecting from the inner space of the main body case 304 through a hole in the peripheral wall portion of the main body case 304 of the handle portion 302, and the main body case 304 is connected via the port 70. It is opened in the internal space. Similarly, the water supply pipe 20 is connected to a port 72 projecting from the internal space of the main body case 304, and is opened to the internal space of the main body case 304 via the port 72.

One end of a gas supply tube 74A is connected to the port 70 as shown in FIG. The other end of the gas supply tube 74A is connected to a first output port 314 (shown in FIG. 21) of the rotary valve 308 disposed in the main body case 304. Then, one end of the gas supply tube 74B is connected to the first input port 312 of the rotary valve 308, and the gas supply tube 74B extends outside through the opening of the main body case 304. The other end of the gas supply tube 74B extended to the outside is connected to the CO ₂ supply device 80 shown in FIG. Thus, the port 70 is connected to the CO ₂ supply device 80 through the rotary valve 308 gas supply tube 74A, the 74B, CO ₂ gas is a gas supply tube 74B from the CO ₂ supply device 80, the rotary valve 308, a gas supply It is supplied to the nozzle 68 at the distal end of the sheath insertion portion 14 via the tube 74A, the port 70, and the air supply conduit 18.

  Further, one end of a liquid supply tube 82A is connected to the port 72 as shown in FIG. The other end of the liquid supply tube 82A is connected to the second output port 318 of the rotary valve 308. Then, one end of a liquid supply tube 82B is connected to the second input port 316 (shown in FIG. 21) of the rotary valve 308, and the liquid supply tube 82B extends outside through the opening of the main body case 304. The other end of the liquid supply tube 82B extended to the outside is connected to the water feeding device 88 shown in FIG. Accordingly, the port 72 is connected to the water supply device 88 via the rotary valve 308 by the liquid supply tubes 82A and 82B, and the water from the water supply device 88 is supplied to the liquid supply tube 82B, the rotary valve 308, the liquid supply tube 82A, the port 72, And is supplied to the nozzle 68 at the distal end of the sheath insertion portion 14 via the water supply pipe 20.

  The handle portion 302 includes a main body case 304 that surrounds the entire outer periphery with a peripheral wall portion. In the main body case 304, the endoscope insertion portion 26 of the rigid endoscope 200 is located at a position that intersects the longitudinal axis A of the sheath insertion portion 14. Is formed through the lumen 16 of the sheath insertion portion 14. The insertion assisting tool 300 is attached to the rigid endoscope 200 by inserting the endoscope insertion part 26 into the lumen 16 of the sheath insertion part 14 from the rear side of the main body case 304 through this opening. .

Further, the handle 302 is turned on by injecting the CO ₂ gas from the nozzle 68 at the tip of the sheath insertion portion 14 and the injection of the mixed fluid (CO ₂ gas and washing water) by rotating the air / water feeding lever 320. An operation mechanism for switching between on and off is provided.

  As shown in FIG. 20, an air / water supply lever 320 is arranged outside the right side of the main body case 304 of the handle portion 302. The air / water supply lever 320 is integrally formed with a shaft body 322 having a rotation axis in the left-right direction, and can be rotated around the rotation axis of the shaft body 322.

  The shaft body 322 extends from the valve body 324 of the rotary valve 308 accommodated in the main body case 304. As shown in FIGS. 21 and 22, the rotary valve 308 includes a cylindrical valve case 310 fixed to the main body case 304, and a valve body 324 that is fitted into the valve case 310 and is rotatably supported. It has.

  The valve case 310 includes a pair of a first input port 312 (see FIG. 21), a first output port 314 (see FIG. 22), a second input port 316 (see FIG. 21), and a second output port 318 (see FIG. 21). 22) and projecting outward at a substantially counter electrode position (a position that forms an angle of approximately 180 degrees around the central axis of the valve case 310), and pipes communicating with the distal end openings of these ports 312 to 318 A passage (hole) is formed to penetrate to the inner peripheral surface of the valve case 310. Note that the openings on the inner peripheral surface side of the pipelines in the ports 312 to 318 are referred to as inner openings 312A to 318A.

  The valve body 324 is formed of a cylindrical member whose outer peripheral surface is fitted to the inner peripheral surface of the valve case 310 without a substantial gap, and the shaft body 322 is extended from one end portion thereof, and the shaft body 322 is formed. An air / water feeding lever 320 is formed on the outer peripheral surface of the air. Therefore, when the air / water supply lever 320 is rotated, the valve body 324 rotates in the valve case 310 via the shaft body 322. Further, the valve body 324 and the shaft body 322 are urged by a biasing means such as a coil spring in a direction in which the air / water supply lever 320 is rotated upward with respect to a position where the air / water supply lever 320 is substantially horizontal. The rotation in the biasing direction is stopped at a rotation position (non-operation position) where the rotation is restricted by a predetermined restriction means.

  On the other hand, a restricting member 326 that contacts the air / water supply lever 320 is provided at a position where the air / water supply lever 320 is in a substantially horizontal state so as to protrude from the right side surface of the main body case 304 as shown in FIGS. It has been. Accordingly, the rotatable range of the air / water supply lever 320 includes the non-operation position where the rotation in the urging direction by the urging means is restricted, and the air / water supply lever 340 against the urging force of the urging means. Is a range up to a rotation position (maximum rotation position) in a substantially horizontal state that comes into contact with the regulating member 326 when the rotation is operated. The air / water supply lever 320 can be rotated by sandwiching the air / water supply lever 320 and the regulating member 326 between, for example, a thumb and an index finger.

  As will be described in detail later, the valve body 324 matches the inner opening 312A of the first input port 312 and the inner opening 314A of the first output port 314 with respect to the central axis direction as shown in FIGS. A pipe line having inlet openings 330 </ b> A to 330 </ b> C and an outlet opening 332 is formed through the counter electrode on the outer peripheral surface. In addition, an inlet opening 334 and an outlet opening 336 are provided at counter electrode positions on the outer peripheral surface that coincide with the inner opening 316A of the second input port 316 and the inner opening 318A of the second output port 318 with respect to the central axis direction of the valve body 324. A pipe line is formed through.

  By rotating the air / water supply lever 320 to change the rotational position of the valve body 324, any of the inlet openings 330 </ b> A to 330 </ b> C and the outlet opening 332 provided in the valve body 324 can be In the case where the inner opening 312A of the first input port 312 and the inner opening 312B of the first output port 314 are arranged so as to overlap, the pipe line of the valve body 324 is between the first input port 312 and the first output port 314. The connection state is established through. Further, when the inlet opening 334 and the outlet opening 336 of the valve body 324 are arranged so as to overlap the inner opening 316A of the second input port 316 and the inner opening 318B of the second output port 318, the second input port 316 and The second output port 318 is connected to the second output port 318 through a pipe line of the valve body 324.

  On the other hand, any of the inlet openings 330A to 330C and the outlet opening 332 provided in the valve body 324 are not overlapped with the inner opening 312A of the first input port 312 and the inner opening 312B of the first output port 314 of the valve case 310. In the case of being arranged, a state in which the space between the first input port 312 and the first output port 314 is cut by the valve body 324 is obtained. Further, when the inlet opening 334 and the outlet opening 336 provided in the valve body 324 are arranged at positions that do not overlap the inner opening 316A of the second input port 316 and the inner opening 318B of the second output port 318 of the valve case 310. Is in a disconnected state where the valve body 324 disconnects between the second input port 316 and the second output port 318.

  Thereby, the disconnection and connection between the first input port 312 and the first output port 314 of the rotary valve 308 and between the second input port 316 and the second output port 318 are used for air supply and water supply. The lever 320 can be switched by a turning operation.

As described above, the CO ₂ supply device 80 is connected to the first input port 312 of the rotary valve 308 via the gas supply tube 74B, and the first output port 314 corresponding to the first input port 312 has A port 70 communicating with the air supply pipe line 18 of the sheath insertion portion 14 is connected via the gas supply tube 74A. A water supply device 88 is connected to the second input port 316 of the rotary valve 308 via a liquid supply tube 82B, and a second output port 318 corresponding to the second input port 316 is connected to the second input port 316 via a liquid supply tube 82A. A port 72 communicating with the water supply conduit 20 of the sheath insertion portion 14 is connected. Therefore, a pipe line between the first input port 312 and the first output port 314 and a pipe line between the second input port 316 and the second output port 318 are obtained by rotating the air / water supply lever 320. By switching between the connected state and the disconnected state, the supply of CO ₂ gas to the air supply conduit 18 (nozzle 68) of the sheath insertion portion 14 and the cleaning of the sheath insertion portion 14 to the water supply conduit 20 (nozzle 68) are performed. The water supply can be switched on / off.

  The operation of the rotary valve 308 will be described with reference to FIGS. 23A to 26A are cross-sectional views of the valve case 310 and the valve body 324 cut at the positions of the first input port 312 and the first output port 314, and FIG. ) Is a cross-sectional view of the valve case 310 and the valve body 324 cut at the positions of the second input port 316 and the second output port 318.

When the air / water supply lever 320 is not operated, as shown in FIG. 23A, all of the inlet openings 330A to 330C and the outlet opening 332 formed in the valve body 324 of the rotary valve 308 are in the valve case. The inner opening 312A of the first input port 312 of 310 and the inner opening 314A of the first output port 314 are not overlapped. 23B, the inlet opening 334 and the outlet opening 336 of the valve body 324 overlap the inner opening 316A of the second input port 316 and the inner opening 318A of the second output port 318 of the valve case 310. It is in a state that does not become. Therefore, the pipe lines between the first input port 312 and the first output port 314 and between the second input port 316 and the second output port 318 are in a disconnected state, and CO ₂ gas and cleaning None of the water is supplied to the nozzle 68 at the distal end of the sheath insertion portion 14.

  From this state, when the air / water supply lever 320 is rotated toward the position of the restricting member 326 (a position where the restricting member 326 is in a substantially horizontal state), first, as shown in FIG. The inlet opening 330A and the outlet opening 332 of the valve body 324 overlap with the inner opening 312A of the first input port 312 and the inner opening 314A of the first output port 314 of the valve case 310. At this time, as shown in FIG. 24B, the inlet opening 334 and the outlet opening 336 of the valve body 324 overlap the inner opening 316A of the second input port 316 and the inner opening 318A of the second output port 318 of the valve case 310. It is maintained in a state that does not become.

  Here, as shown in FIG. 21, the inlet openings 330B and 330C of the valve body 324 are formed as openings having substantially the same diameter as the inner opening 312A of the first input port 312. It is formed as a slit-like opening extending in the circumferential direction continuously to the inlet opening 330B. The width in the left-right direction (width in the short direction) of the inlet opening 330 </ b> A is about 1 to several tenths to several tenths of the diameter of the inner opening 312 </ b> A of the first input port 312.

  On the other hand, as shown in FIGS. 22 and 23A to 26A, the outlet opening 332 of the valve body 324 extends in the circumferential direction over a region including the counter electrode position of each of the inlet openings 330A to 330C. It is formed as one slit-like opening that extends. The width in the left-right direction (width in the short direction) of the outlet opening 332 is substantially the same as the diameter of the inner opening 314A of the first output port 314.

  And in the valve body 324, as shown to FIG. 23 (A)-FIG. 26 (A), it connects to the pipe line (space part) 340A-340C connected to each inlet opening 330A-330C, and the outlet opening 332. A pipe line (space part) 342 is formed, and the pipe lines 340A to 340C and 342 are connected.

Accordingly, when any one of the inlet openings 330A to 330C of the valve body 324 is disposed at a position overlapping the inner opening 312A of the first input port 312, the outlet opening 332 of the valve body 324 becomes the inner opening 314A of the first output port 314. The first input port 312 and the first output port 314 are connected to one of the pipe lines 340A to 340C of the valve body 324 through the pipe line 342. As a result, CO ₂ gas is supplied to the nozzle 68 at the distal end of the sheath insertion portion 14.

When the air / water supply lever 320 is rotated as described above, first, as shown in FIG. 24A, the slit-like inlet opening 330A and the outlet opening 332 are provided in the inner opening 312A of the first input port 312. And the first output port 314 are connected to each other, the flow rate is restricted by the slit-shaped inlet opening 330A and the slit-shaped conduit 340A communicating with the slit-shaped inlet opening 330A, and a small amount of CO ₂ gas flows. ing. Therefore, the amount of CO ₂ gas supplied to the nozzle 68 at the distal end of the sheath insertion portion 14 is also smaller than usual. In this state, a gas curtain is formed in front of the illumination window 40 and the observation window 42 to prevent dirt from adhering to the illumination window 40 and the observation window 42 and clouding of the illumination window 40 and the observation window 42. Can be used.

  As shown in FIGS. 21 and 22, the inlet opening 334 of the valve body 324 is formed as an opening having substantially the same diameter as the inner opening 316 </ b> A of the second input port 316. On the other hand, the outlet opening 336 of the valve body 324 is formed as an opening having substantially the same diameter as the inner opening 318A of the second output port 318 at the counter electrode position of the inlet opening 334.

  And in the valve body 324, the pipe line 344 which connects the inlet opening 334 and the outlet opening 336 is formed as shown in FIG.23 (B)-FIG.26 (B).

  Therefore, when the inlet opening 334 of the valve body 324 is disposed at a position overlapping the inner opening 316A of the second input port 316, the outlet opening 336 of the valve body 324 is disposed at a position overlapping the inner opening 318A of the second output port 318. The second input port 316 and the second output port 318 are connected by the pipe 344 of the valve body 324. As a result, the cleaning water is supplied to the nozzle 68 at the distal end of the sheath insertion portion 14.

  As shown in FIG. 24A, when the slit-like inlet opening 330A and outlet opening 332 of the valve body 324 overlap the inner opening 312A of the first input port 312 and the first output port 314, As shown in FIG. 24B, the inlet opening 334 and the outlet opening 336 of the valve body 324 are not overlapped with the inner opening 316A of the second input port 316 and the inner opening 318A of the second output port 318. The input port 316 and the second output port 318 are disconnected. Accordingly, the cleaning water is not supplied to the nozzle 68 at the distal end of the sheath insertion portion 14.

When the air / water supply lever 320 is further rotated toward the position of the regulating member 326 from the state of FIGS. 24 (A) and (B), the valve body 324 further rotates, and FIG. As shown, the inlet opening 330B and the outlet opening 332 of the valve body 324 overlap the inner opening 312A of the first input port 312 and the inner opening 314A of the first output port 314 of the valve case 310. As a result, a normal connection state is established in which the flow rate is not limited between the first input port 312 and the first output port 314. At this time, the inlet opening 334 and the outlet opening 336 of the valve body 324 are not overlapped with the inner opening 316A of the second input port 316 and the inner opening 318A of the second output port 318 as shown in FIG. ing. As a result, the second input port 316 and the second output port 318 are disconnected. Therefore, only a normal amount of CO ₂ gas is supplied from the nozzle 68 at the distal end of the sheath insertion portion 14, and CO ₂ gas is injected from the nozzle 68.

When the air / water supply lever 320 is further rotated toward the position of the regulating member 326, the valve body 324 further rotates, and as shown in FIG. 26A, the inlet opening 330A and the outlet of the valve body 324 are rotated. The opening 332 overlaps the inner opening 312A of the first input port 312 and the inner opening 314A of the first output port 314. At this time, the inlet opening 334 and the outlet opening 336 of the valve body 324 also overlap with the inner opening 316A of the second input port 316 and the inner opening 318A of the second output port 318 as shown in FIG. As a result, the connection state is established between the first input port 312 and the first output port 314 and between the second input port 316 and the second output port 318. Therefore, CO ₂ gas and cleaning water are supplied to the nozzle 68 at the distal end of the sheath insertion portion 14, and a mixed fluid of CO ₂ gas and cleaning water is ejected from the nozzle 68.

According to the insertion assisting tool 300 of the fourth embodiment described above, the rotation assisting operation of only the air / water feeding lever 320 is the same as the insertion assisting tool of the first embodiment and the second embodiment. In addition, it is possible to switch ON / OFF of the injection of CO ₂ gas from the nozzle 68 and the injection of the mixed fluid.

  For example, by not providing the inlet opening 330 </ b> C of the valve body 324, it is possible to supply only the cleaning water, not the mixed fluid, to the nozzle 68 for injection.

Further, in the above description, when the air / water supply lever 320 is not operated, the rotary valve 308 is in the state shown in FIGS. 23A and 23B, and both the CO ₂ gas and the cleaning water are in the sheath insertion portion 14. Although not supplied to the nozzle 68 at the front end, the state shown in FIGS. 24A and 24B may be set when the air / water supply lever 320 is not operated. In this case, when not operated, a small amount of CO ₂ gas is jetted from the nozzle 68 and a gas curtain is formed in front of the illumination window 40 and the observation window 42. At this time, the state of the rotary valve 308 may be changed only to the state shown in FIGS. 24 to 26 by operating the air / water supply lever 320, or the state shown in FIG. 24 is changed to the state shown in FIG. It may be possible to set the state of FIG. 23 by operating the air / water supply lever 320 in the direction opposite to the operation direction, and further to lock the air / water supply lever 320 in the state of FIG. Good.

  As described above, the endoscope insertion aid according to the first to fourth embodiments has been described in detail. However, the present invention is not limited to the above examples, and the scope of the present invention is not deviated. Of course, various improvements and modifications may be made.

DESCRIPTION OF SYMBOLS 10,150,220,300 ... Endoscopic insertion aid, 12, 200 ... Rigid endoscope, 14 ... Sheath insertion part, 22 ... End opening part, 24 ... Main part, 26 ... Endoscope insertion part, 28 ... Connector, 30, 152 ... Handle part, 31 ... Main body, 32 ... Air / water lever, 32A ... Opening part, 32B, 32C ... Leg part, 34 ... U-shaped notch part, 36 ... Light guide cable, 38 ... light source device, 40 ... illumination window, 42 ... observation window 44 ... eyepiece, 46 ... eyepiece, 64 ... support portion, 68 ... nozzle, 70, 72 ... port, 74 ... gas supply tube, 80 ... CO ₂ Supply device, 82 ... liquid supply tube, 88 ... water supply device, 90, 92 ... stopper, 94, 96 ... torsion coil spring, 100, 102 ... push-down member, 156 ... support plate, 170 ... arm for air / water supply, 174 ... Moving body, 184 ... ridge Part, 188, 190 ... swing plate, 192, 194 ... stopper

Claims (8)

A proximal operation portion and a tubular sheath insertion portion having a lumen connected to the proximal operation portion and inserted through the insertion portion of the endoscope, and the sheath insertion portion is connected to the distal end portion. In an insertion assisting tool for an endoscope provided with a first fluid conduit and a second fluid conduit communicating with a provided nozzle,
The hand operating unit is
A first fixing member disposed along an insertion passage through which the first tube connected to the first fluid conduit is inserted;
A second fixing member disposed along an insertion passage through which the second tube connected to the second fluid conduit is inserted;
A first locking portion disposed opposite to the first fixing member across the first tube; a pressing position where the first locking portion presses the first tube; A first pressing member that is displaced between a non-pressing position where the stop does not press the first tube;
A second locking portion disposed opposite to the second fixing member across the second tube; a pressing position where the second locking portion presses the second tube; and the second engagement A second pressing member that is displaced independently of the first pressing member between a non-pressing position where the stop does not press the second tube;
An operation member supported so as to be displaceable in a predetermined operation direction from a reference position at the time of non-operation in which the first and second pressing members are set to the pressing position, and from the reference position to the operation direction. At the first displacement position displaced by the first displacement amount, the first pressing member is set to the non-pressing position, the second pressing member is set to the pressing position, and the second displacement is made from the first displacement position to the operation direction. An operation member that sets the first pressing member and the second pressing member to the non-pressing position at the second displacement position displaced by an amount;
An insertion assisting tool for an endoscope, comprising: The operating member is
When displacing from the reference position to the first displacement position, the first pressing member is pressed from the pressing position to the non-pressing position by contacting the first pressing member and pressing the first pressing member. While displacing, the second pressing member is held at the pressing position by not contacting the second pressing member,
When displacing from the first displacement position to the second displacement position, the first pressing member is held at the non-pressing position by contacting the first pressing member and pressing the first pressing member. In addition, the second pressing member is displaced from the pressing position to the non-pressing position by contacting the second pressing member and pressing the second pressing member. Endoscope insertion aid.   The insertion assisting tool for an endoscope according to claim 1 or 2, wherein the first pressing member and the second pressing member are urged from the non-pressing position toward the pressing position.   The endoscope insertion assisting tool according to claim 1, 2, or 3, wherein the operation member is a lever that is rotatably supported. The operating member is
When changing from the reference position to the first displacement position, the state changes from a state in which the first pressing member is contacted with the first pressing member to a state in which the first pressing member is not in contact with the first pressing member. The first pressing member is displaced from the pressing position to the non-pressing position, and the second pressing member is pressed by holding the second pressing member in contact with the second pressing member. Hold in position,
While displacing from the first displacement position to the second displacement position, the first pressing member is held at the non-pressing position by maintaining a state where the first pressing member is not in contact with the second pressing position. The second pressing member is displaced from the pressing position to the non-pressing position by changing from a state of contacting the pressing member and pressing the first pressing member to a state of not contacting the first pressing member.
The endoscope insertion aid according to claim 1.   The endoscope insertion assisting tool according to claim 1 or 5, wherein the first pressing member and the second pressing member are biased from the pressing position toward the non-pressing position.   The said operation member is supported so that a movement to a longitudinal axis direction is possible, and was equipped with the arm urged | biased from the said 2nd displacement position to the direction of the said reference position, The Claim 1, 5, or 6 characterized by the above-mentioned. Insertion aids for endoscopes.   The said 1st fluid pipeline is an air supply pipeline or a suction pipeline, and the said 2nd fluid pipeline is a water supply pipeline, The any one of Claims 1-7 characterized by the above-mentioned. Endoscope insertion aid.

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