JP5830431B2 - Endoscope - Google Patents

Description

  The present invention relates to an endoscope.

  In general, the surface of the observation window disposed at the distal end of the insertion portion of the endoscope is frequently soiled by liquids existing in the body when the endoscope is used. When the observation window becomes dirty, water is sprayed on the surface of the observation window to wash away the dirt, and thereafter, a cleaning operation is performed in which water remaining on the surface of the observation window is blown off with air. A nozzle is disposed at the distal end portion of the endoscope toward the surface of the observation window for this cleaning. If a water supply nozzle for ejecting water and an air supply nozzle for ejecting air are provided separately, the water ejection path and the air ejection path do not match, and the water remaining in the observation window May not be blown away by air supply. Therefore, in general, only one dual-purpose nozzle that can perform both water supply and air supply is provided at the tip so that water supply and air supply are performed from the same opening. For this reason, for example, as in Patent Document 1, there is often provided a structure in which the air supply conduit and the water supply conduit are merged on the distal end side of the insertion portion using a confluence member made of a bending pipe or the like.

JP-A-7-67831

  In an endoscope having a structure in which an air supply conduit and a water supply conduit merge, when the water supply state in which water is ejected is changed to the air supply state in which air is ejected, the water in the water supply conduit is If it flows out onto the road, water droplets adhering to the observation window are not sufficiently removed. Patent Document 1 has a structure in which a flow path switching member is provided at a junction between an air supply pipe and a water supply pipe so that water in the water supply pipe does not flow out to the air supply pipe in an air supply state. It is disclosed. However, when a flow path switching member is provided at the junction as disclosed in Patent Document 1, the junction is complicated and enlarged.

  Therefore, an object of the present invention is to provide an endoscope capable of stopping the flow of water from a water supply line to an air supply line when the water supply state is switched to the air supply state with a simple and small structure.

To achieve the above object, according to one aspect of the present invention, an endoscope includes an air supply conduit configured to allow gas to pass through, a water supply conduit configured to allow liquid to pass through, and the water supply conduit. An endoscope comprising: an air / water supply conduit that is located downstream of the trachea passage and the water supply conduit and is configured to allow the gas and the liquid to pass therethrough, the air supply conduit and The air / water supply conduit includes a first conduit, the first conduit includes a side opening, and the water supply conduit is connected to the first conduit at the side opening. And the upstream side of the side opening of the first pipe constitutes the air supply pipe, and the downstream of the side opening of the first pipe constitutes the air supply / water supply pipe and the water supply conduit has a connecting line located at the engagement stream portion of the said a water supply conduit first conduit, the first conduit In a plane passing through the second central axis first central axis is central axis to be the said connection conduit central axis of the first conduit inner wall of the air and water supply tubes roadside of the connection conduit When the tangent line at the intersection point with the first tangent line is the first tangent line, the first tangent point is an intersection point of the first tangent line and the first tangent line. A first angle that is an angle formed by a half line and a half line on the first tangent line that exits from the first intersection to the connection pipe line side is an obtuse angle.

  According to the present invention, it is possible to provide an endoscope capable of stopping the flow of water from a water supply line to an air supply line when the water supply state is switched to the air supply state with a simple and small structure.

The block diagram which shows the outline of the structural example of the endoscope system which concerns on each embodiment. The figure which shows the outline of the structural example of the front-end | tip part of the endoscope of each embodiment. The figure which shows the outline of the structural example of the air supply line which concerns on 1st Embodiment, a water supply line, and an air supply / water supply line. Sectional drawing which shows the structural example of the confluence | merging part which concerns on 1st Embodiment. The figure which shows an example of the mode of the confluence | merging part at the time of the water supply which concerns on 1st Embodiment, and the air supply. Sectional drawing which shows the structural example of the confluence | merging part which concerns on a comparative example. The figure which shows an example of the mode of the confluence | merging part at the time of the water supply which concerns on a comparative example, and air supply. Sectional drawing which shows the structural example of the confluence | merging part which concerns on the 1st modification of 1st Embodiment. Sectional drawing which shows the structural example of the confluence | merging part which concerns on the 2nd modification of 1st Embodiment. Sectional drawing which shows the structural example of the confluence | merging part which concerns on the 3rd modification of 1st Embodiment. Sectional drawing which shows the structural example of the confluence | merging part which concerns on the 4th modification of 1st Embodiment. Sectional drawing which shows the structural example of the confluence | merging part which concerns on the 5th modification of 1st Embodiment. The side view of the air supply line member and water supply line member which concern on the 5th modification of 1st Embodiment. The top view of the air supply line member and water supply line member which concern on the 5th modification of 1st Embodiment. Sectional drawing which shows the structural example of the confluence | merging part which concerns on 2nd Embodiment. Sectional drawing which shows the structural example of the confluence | merging part which concerns on 2nd Embodiment. Sectional drawing which shows the structural example of the confluence | merging part which concerns on 3rd Embodiment. Sectional drawing which shows the structural example of the confluence | merging part which concerns on 3rd Embodiment.

[First Embodiment]
A first embodiment of the present invention will be described with reference to the drawings. FIG. 1 shows an outline of the configuration of a pipeline related to air supply and water supply of the endoscope system 300 according to the present embodiment. As shown in this figure, the endoscope system 300 includes an endoscope 1. The endoscope 1 includes an operation unit 2, an insertion unit 3 that is inserted into a body cavity, and a universal cord unit 4. The side of the insertion portion 3 that is inserted into the body cavity is referred to as the distal end side, and the universal cord side is referred to as the proximal end side.

  The insertion portion 3 includes a distal end rigid portion 7, a bending portion 6, and a flexible portion 5 in order from the distal end side. An outline of the appearance of the distal end portion of the insertion portion 3 is shown in FIG. As shown in this figure, the distal end rigid portion 7 includes an illumination window 8 for emitting light, an observation window 9 provided with a camera and the like, a treatment instrument inserted from the operation portion 2 of the endoscope 1 and the like. A treatment instrument outlet 10 serving as an outlet is provided. Further, the distal end rigid portion 7 is provided with a nozzle 11 for ejecting air or washing water toward the observation window 9.

  As shown in FIG. 1, one end of an air / water supply conduit 270 through which, for example, air and water are passed is connected to the nozzle 11. In the confluence portion 100 on the distal end side of the flexible portion 5, an air supply conduit 210 through which a gas such as air passes and a water supply conduit through which a liquid such as water passes through the other end of the air supply / water supply conduit 270. 240 is connected. The air supply conduit 210 and the water supply conduit 240 extend through the operation portion 2 to the connector portion 15 provided at the base end of the universal cord portion 4.

  The operation unit 2 is provided with an air / water switching valve 16. The air / water supply switching valve 16 is provided in the air supply line 210 and the water supply line 240, an air supply state in which air is ejected from the nozzle 11, a water supply state in which water is ejected from the nozzle 11, The air supply / water supply stop state in which neither air nor water is ejected from the nozzle 11 is switched. The air / water switching valve 16 is operated by a user's finger holding the operation unit 2.

  The endoscope system 300 includes an air pump 17 as an air supply source, a water supply tank 18 as a water supply source, an air pipe 19, a pressure pipe 20, and a water supply pipe 21. Water is stored in the water supply tank 18, and the water supply tank 18 is closed to the outside air. The water supply pipe 21 is inserted into the water supply tank 18 so that one end thereof is located below the water surface of the water supply tank. The other end of the water supply pipe 21 is detachably connected to the water supply pipe line 240.

  One end of the air pipe 19 and one end of the pressure pipe 20 are connected. An air pump 17 is connected to a connection portion between the air pipe 19 and the pressure pipe 20. The pressurizing pipe 20 is inserted into the water supply tank 18 so that the other end thereof is maintained in a position higher than the liquid level in the water supply tank 18. The other end of the air pipe 19 is detachably connected to the air supply pipe line 210.

  The air pump 17 pressurizes the air pipe 19 and the pressure pipe 20. When the air / water supply switching valve 16 causes the air supply line 210 to communicate with the outside air at the air / water supply changeover valve 16 and the water supply line 240 is closed, the pressurized air in the air pipe 19 is not supplied. The air / water switching valve 16 is discharged to the outside air. At this time, the air supply / water supply stop state is reached in which neither air nor water is ejected from the nozzle 11. When the air / water switching valve 16 makes the air supply line 210 conductive and the water supply line 240 closed, the pressurized air in the air pipe 19 is ejected from the nozzle 11 through the air supply line 210. To do. That is, an air supply state is realized. When the air / water switching valve 16 closes the air supply line 210 and makes the water supply line 240 conductive, the pressurized air in the pressurized pipe 20 causes the water level in the water supply tank 18 to flow. Pressurize. Water in the water supply tank 18 is ejected from the nozzle 11 through the water supply pipe 21 and the water supply pipe 240. That is, a water supply state is realized.

  FIG. 3 shows an outline of the structure of the air supply / water supply conduit 270, the air supply conduit 210, the water supply conduit 240, and the portion related to the tip rigid portion 7. As shown in this figure, the air / water supply conduit 270 is mainly formed by an air / water supply tube 272. The air supply conduit 210 is mainly formed by an air supply tube 212. The water supply conduit 240 is mainly formed by a water supply tube 242. A merge member 110 is provided in the merge unit 100. An air supply tube 212 and a water supply tube 242 are connected to the proximal end side of the confluence member 110, and an air supply / water supply tube 272 is connected to the distal end side of the confluence member 110. Here, the central axis of the air supply tube 212 and the central axis of the air / water supply tube 272 coincide with or substantially coincide with each other, and when the flexible portion 5 is linear, the air supply pipe 210 and the air / water supply pipe 270 Are arranged in a straight line. In this way, the water supply line 240 joins the air supply line 210 via the confluence member 110.

  A fluid passage 26 is formed in the distal end rigid portion 7. A proximal end portion of the nozzle 11 is inserted into the distal end side of the fluid passage 26, and a connection pipe 27 is disposed on the proximal end side of the fluid passage 26. The front end side of the nozzle 11 opens in the direction of the observation window 9. An air / water supply tube 272 is connected to the proximal end side of the connection pipe 27.

  An enlarged view of the cross section of the merging portion 100 is shown in FIG. The merging member 110 includes an air supply conduit member 120 and a water supply conduit member 150. The air supply pipe member 120 is provided with a first pipe line 122. An air supply tube 212 is connected to the proximal end side of the first conduit 122, and an air supply / water supply tube 272 is connected to the distal end side of the first conduit. Further, the air supply pipe member 120 is provided with a side surface opening 124 connected to the first pipe line 122.

  The water supply pipe member 150 is provided with a second pipe 151. One end side of the second pipe line 151 is a connection pipe line 152 connected to the side opening 124 of the air supply pipe member 120. An end connected to the side opening 124 of the connection pipe line 152 is referred to as a tip opening 154. A connecting pipe line 152 is fitted in the side opening 124, and a tip surface 156 that forms the tip opening 154 is disposed so as to coincide with the inner surface of the first pipe line 122. A water supply tube 242 is connected to the other end of the second conduit 151. In this way, in the merging portion 100, the air supply conduit 210 and the water supply conduit 240 are merged. By combining the air supply pipe member 120 and the water supply pipe member 150 to form the merge portion 100 as in the present embodiment, an effect of facilitating manufacturing can be obtained.

  The central axis of the air supply pipe member 120 is a first central axis 130, and the central axis of the connection pipe line 152 of the water supply pipe member 150 is a second central axis 160. The tangent at the intersection with the first pipe 122 on the tip side of the connection pipe line 152 on the plane passing through the first central axis 130 and the second central axis 160, that is, the inner wall on the air / water supply pipe line side, is the first tangent line. 162. In the present embodiment, since the connection pipe line 152 has a cylindrical shape, the first tangent line 162 coincides with the inner wall on the distal end side of the connection pipe line 152, and the first tangent line 162 is connected to the second central axis 160. Become parallel.

  An intersection between the first central axis 130 and the first tangent 162 is defined as a first intersection 164. A half line on the first central axis 130 exiting from the first intersection point 164 toward the air supply conduit 210 and a half line on the first tangent line 162 exiting from the first intersection point 164 toward the connection conduit 152 side The angle is a first angle θ1. At this time, the first angle θ1 is an obtuse angle.

  The air supply pipe member 120 and the water supply pipe member 150 are fixed by adhesion, press fitting, soldering, brazing, or a combination thereof, and any fixing method may be used. An air supply tube 212 is bonded or welded to the proximal end side of the air supply duct member 120, and an air supply / water supply tube 272 is bonded or welded to the distal end side of the air supply duct member 120. Similarly, a water supply tube 242 is bonded or welded to the proximal end side of the water supply conduit member 150.

  The air supply pipe member 120 and the water supply pipe member 150 may be formed of any material, but for example, the air supply tube 212, the water supply tube 242, and the air supply / water supply tube 272 are maintained so as to maintain the shape. It is preferable that the hard material is harder. For example, stainless steel or fluororesin may be used for the air supply line member 120 and the water supply line member 150. Since the air supply conduit member 120 and the water supply conduit member 150 are made of a hard material, the shapes of the air supply conduit member 120 and the water supply conduit member 150 that are important as described later are maintained.

  The air supply tube 212, the water supply tube 242, and the air supply / water supply tube 272 may be made of any material, but in consideration of fluidity of fluid and slipperiness with other structures outside the tube, it is a fluororesin tube. Preferably there is. Here, the air / water supply tube 272 has, for example, an inner diameter of 1.0 mm and a total length of 160 mm. The inner diameter of the air supply tube 212 is, for example, 1.0 mm, and the inner diameter of the water supply tube 242 is, for example, 0.9 mm.

  Next, the operation of the endoscope system 300 according to the present embodiment will be described. When the endoscope system is used for examination or diagnosis, the insertion unit 3 is inserted into a body cavity. At this time, if a body fluid or the like adheres to the observation window 9, the field of view deteriorates. In such a case, the user operates the air / water supply switching valve 16 to first set the water supply state, and the washing water is ejected from the nozzle 11 toward the observation window 9 to wash away the dirt adhering to the observation window 9. Next, the user operates the air / water supply switching valve 16 to switch to the air supply state, and jets pressurized air from the nozzle 11 to remove the cleaning water adhering to the observation window 9.

  A state in the vicinity of the merging portion 100 is shown in FIG. Here, Fig.5 (a) shows the state of the confluence | merging part 100 vicinity in a water supply state, FIG.5 (b) shows the state of the confluence | merging part 100 immediately after switching from a water supply state to an air supply state. In the water supply state, the water 54 flows from the proximal end side of the water supply conduit 240 to the distal end side, and from the proximal end side of the air / water supply conduit 270 to the distal end side via the junction 100. Accordingly, as shown in FIG. 5A, the water supply pipe 240, the air / water supply pipe 270, and the junction 100 are filled with water 54. On the other hand, the air supply duct 210 is filled with air 51. However, due to the pressure of the water 54, the water 54 is slightly pushed out also in the direction of the air supply pipe 210.

  On the other hand, when the air supply state is switched, the air 51 flows from the proximal end side of the air supply conduit 210 to the distal end side, and from the proximal end side of the air / water supply conduit 270 via the junction 100 to the distal end side. And flow. Therefore, as shown in FIG. 5B, the air supply pipe 210, the air / water supply pipe 270, and the junction 100 are filled with the air 51. On the other hand, the water supply conduit 240 is filled with water 54. However, the air 51 is slightly pushed out in the direction of the water supply pipe 240 by the pressure of the air 51.

  Such cleaning of the observation window 9 is frequently performed in inspection or diagnosis. For this reason, it is desired that water adhering to the observation window 9 after water supply is instantaneously removed by air supply. Furthermore, it is important to prevent water from leaking out of the nozzle 11 during air supply. According to the present embodiment, the configuration of the merging unit 100 can effectively prevent water from leaking from the nozzle 11 in the air supply state.

  FIG. 6 shows an enlarged view of a cross section of a joining portion 100 ′ of a general endoscope as a comparative example. In the merging portion 100 ′ shown in this figure, an angle formed in the same manner as in the case of the present embodiment on the plane passing through the first central axis 130 of the air supply pipe member 120 and the second central axis 160 of the connection pipe line 152. think of. A half line on the first central axis 130 exiting from the first intersection point 164 toward the air supply conduit 210 and a half line on the first tangent line 162 exiting from the first intersection point 164 toward the connection conduit 152 side The angle θ ′ is an acute angle as shown in FIG.

  FIG. 7A shows a state in the vicinity of the merging portion 100 ′ in the water supply state, and FIG. 7B shows a state in the vicinity of the merging portion 100 ′ immediately after switching from the water supply state to the air supply state. In the water supply state, the water 54 is transferred from the proximal end side of the water supply conduit 240 to the distal end side, and from the proximal end side of the air / water supply conduit 270 to the distal end side through the junction 100 ′ as shown in FIG. ) As shown. On the other hand, when the air supply state is switched, the air 51 flows from the proximal end side of the air supply conduit 210 to the distal end side, and from the proximal end side of the air / water supply conduit 270 via the junction 100 to the distal end side. And flow. At this time, as shown in FIG. 7B, the air 51 hardly flows in the direction of the water supply conduit 240. Rather, the water 54 in the water supply conduit 240 is sucked out in the direction of the air supply conduit 210 by the flow of the air 51, and is carried along with the air 51 toward the air supply / water supply conduit 270 as water drops 55. As described above, according to a general endoscope, the water-discharging property at the time of air supply immediately after water supply is poor, and a phenomenon in which water droplets continue to come out from the nozzle 11 easily occurs.

  Compared to the configuration of the merging portion 100 ′ of the general endoscope as shown in FIGS. 6 and 7, according to the configuration of the merging portion 100 of the endoscope 1 according to the present embodiment, as shown in FIG. 4. In addition, since the first angle θ1 is an obtuse angle, the air 51 easily flows into the water supply conduit 240 side, and as a result, a high water stop effect is obtained. That is, according to this embodiment, an endoscope with good drainage is provided. According to the endoscope according to the present embodiment, a clear endoscopic observation image can be obtained quickly.

  Further, according to the present embodiment, the structure of the merging portion 100 is simple, and the inner diameters of the water supply tube 242 and the air supply / water supply tube 272 of the air supply tube 212 are about 1 mm. Even in such an ultra-fine scope, the merging portion 100 can be mounted not in the operation portion 2 but in the insertion portion 3. As a result, the length of the air / water supply conduit 270 disposed on the distal end side from the junction 100 can be designed to be as short as about 100 mm to 150 mm. Since the air / water supply conduit 270 is short, the switching response of air / water supply is quick, the stress of the user is reduced, and the time for examination and diagnosis is shortened.

  In the present embodiment, as shown in FIG. 4, the shape of the wall on the distal end side of the connection conduit 152 of the water supply conduit member 150 on the surface through which the first central axis 130 and the second central axis 160 pass is It is a straight line. However, it is not limited to this. If the first angle θ1 is an obtuse angle at the junction with the first pipe line 122, the shape of the wall on the distal end side of the connection pipe line 152 functions in the same way, and the same effect is obtained. However, it is easier to manufacture if the shape of the wall on the distal end side of the connection pipe line 152 is a linear shape and the connection pipe line 152 has a cylindrical shape. The air supply tube 212 and the water supply tube 242 may be a multi-lumen tube or the like in which two channels are formed over almost the entire length.

[First Modification of First Embodiment]
A first modification of the first embodiment will be described. Here, differences from the first embodiment will be described, and the same portions will be denoted by the same reference numerals and description thereof will be omitted. An enlarged view of a cross section of the merging portion 100 according to this modification is shown in FIG. In this modification, the air supply pipe 210 to the air supply / water supply pipe 270 through the junction 100 are formed by one air supply tube 222. That is, the first conduit 122 is formed by the air supply tube 222, and the merging portion 100 includes the water supply conduit member 150 and the air supply tube 222. A side opening 224 is formed on the side surface of the air supply tube 222 in the merging portion 100. The side opening 224 is connected to the tip opening 154 of the connection pipe 152 of the water supply pipe member 150.

  Also in the present modification, the central axis of the air supply tube 222 is the first central axis 130, and the first straight line on the first central axis 130 that exits from the first intersection 164 toward the air supply conduit 210 side, The first angle θ1, which is an angle formed with the half line on the first tangent line 162 that exits from the intersection 164 toward the connection pipe line 152, is an obtuse angle as shown in FIG. Other configurations are the same as those of the first embodiment. Since the first angle θ1 is an obtuse angle, the same effect can be obtained by acting in the same manner as in the first embodiment.

[Second Modification of First Embodiment]
A second modification of the first embodiment will be described. Here, differences from the first embodiment and the first modification will be described, and the same portions will be denoted by the same reference numerals and description thereof will be omitted. FIG. 9 shows an enlarged view of a cross section of the merging portion 100 according to this modification. In this modification, the air supply pipe 210 to the air supply / water supply pipe 270 through the junction 100 are formed by one air supply tube 222. A side opening 224 is formed on the side surface of the air supply tube 222 in the merging portion 100. The water supply tube 242 forming the water supply conduit 240 includes a connection conduit 246 and is provided with a tip opening 248 thereof. The opening surface of the tip opening 248 is bonded or welded and fixed so as to coincide with the inner wall surface of the air supply tube 222.

  Also in this modification, the central axis of the air supply tube 222 is the first central axis 130, and the central axis of the connection pipe 246 is the second central axis 160. A tangent at the intersection of the inner wall on the distal end side of the connection pipe 246 in the plane passing through the first central axis 130 and the second central axis 160 is defined as a first tangent 162. At this time, a half line on the first central axis 130 exiting from the first intersection 164 toward the air supply line 210 and a half line on the first tangent line 162 exiting from the first intersection 164 to the connection duct 246 side. The first angle θ1, which is an angle formed by, is an obtuse angle. Other configurations are the same as those of the first embodiment. Since the first angle θ1 is an obtuse angle, the same effect can be obtained by acting in the same manner as in the first embodiment.

[Third Modification of First Embodiment]
A third modification of the first embodiment will be described. Here, differences from the first embodiment will be described, and the same portions will be denoted by the same reference numerals and description thereof will be omitted. An enlarged view of a cross section of the merging portion 100 according to this modification is shown in FIG. In the present modification, the angle formed by the second central axis 160 of the tip opening 154 with respect to the tip surface 156 of the tip opening 154 of the water supply pipe member 150 is 90 degrees. An angle formed by a half line on the first central axis 130 exiting from the first intersection 164 toward the air supply conduit 210 and a half line on the first tangent 162 exiting from the first intersection 164 toward the connection conduit 152 The water supply line member 150 is bonded and fixed by an adhesive 158 at an angle of θ1-90 ° with respect to the air supply line member 120 so that θ becomes an obtuse angle.

  Other configurations are the same as those of the first embodiment. Since the first angle θ1 is an obtuse angle, the same effect can be obtained by acting in the same manner as in the first embodiment.

[Fourth Modification of First Embodiment]
A fourth modification of the first embodiment will be described. Here, differences from the first embodiment will be described, and the same portions will be denoted by the same reference numerals and description thereof will be omitted. FIG. 11 shows an enlarged view of a cross section of the merging portion 100 according to this modification. In the present modification, the merging member 110 corresponding to the air supply conduit member 120 and the water supply conduit member 150 according to the first embodiment is integrally formed by metal or resin injection molding or the like.

  Also in this modified example, a half line on the first central axis 130 exiting from the first intersection point 164 toward the air supply conduit 210 side, and a first tangent line 162 exiting from the first intersection point 164 toward the connection conduit line 152 side. The first angle θ1 that is an angle formed by the half line is an obtuse angle. Other configurations are the same as those of the first embodiment. Since the first angle θ1 is an obtuse angle, the same effect can be obtained by acting in the same manner as in the first embodiment.

[Fifth Modification of First Embodiment]
A fifth modification of the first embodiment will be described. Here, differences from the first embodiment will be described, and the same portions will be denoted by the same reference numerals and description thereof will be omitted. FIG. 12 shows an enlarged view of a cross section of the merging portion 100 according to this modification. In this modification, the shapes of the air supply pipe member 120 and the water supply pipe member 150 are different from those of the first embodiment. The air supply pipe member 120 and the water supply pipe member 150 according to this modification are such that the joint surface 142 of the air supply pipe member 120 protrudes in the direction of the water supply pipe member 150 on the distal end side as shown in FIG. It has a shape that becomes.

  A side view of the air supply pipe member 120 is shown in FIG. 13 (a), and a side view of the water supply pipe member 150 is shown in FIG. 13 (b). As shown in these drawings, the air supply pipe member 120 has a convex shape in the direction of the water supply pipe member 150 on the distal end side, and the water supply pipe member 150 has a shape in which it protrudes in the direction of the air supply pipe member 120 on the proximal end side. doing. In this way, the joining surface 142 is not the same surface but is provided in a step shape. According to this modification, the bonding area between the air supply pipe member 120 and the water supply pipe member 150 is larger than that in the first embodiment, and the adhesive strength between the air supply pipe member 120 and the water supply pipe member 150 is increased. Will improve. In addition, the fact that the air supply pipe member 120 is convex on the tip side receives the pressure of the water flowing through the water supply pipe 240 and contributes to the improvement of the strength of the merging portion 100.

  An arrow view 14a in FIG. 13 is shown in FIG. 14A, and an arrow view 14b in FIG. 13 is shown in FIG. 14B. As shown in this figure, the side opening 124 of the air supply pipe member 120 to be fitted and the front end opening 154 of the water supply pipe member 150 are not rotated during and after assembly. It has a long shape in the direction of the central axis 130.

  Further, the length W1 of the side opening 124 of the air supply pipe member 120 in the direction of the first central axis 130 and the length W2 of the tip opening 154 of the water supply pipe member 150 in the direction of the first central axis 130 are also shown. Is related to W1 <W2. Further, the length L1 of the side opening 124 of the air supply pipe member 120 in the direction orthogonal to the first central axis 130 and the direction of the front opening 154 of the water supply pipe member 150 orthogonal to the first central axis 130 are also shown. The length L2 has a relationship of L1> L2. By setting the dimensions as described above, the water supply pipe member 150 is pressed into the air supply pipe member 120 only in the axial direction and fixed. Since the structure is press-fitted only in one axial direction, the assemblability is good and high fixing strength can be obtained even if the parts are extremely small.

  Also in this modified example, a half line on the first central axis 130 exiting from the first intersection point 164 toward the air supply conduit 210 side, and a first tangent line 162 exiting from the first intersection point 164 toward the connection conduit line 152 side. The first angle θ1 that is an angle formed by the half line is an obtuse angle. Other configurations are the same as those of the first embodiment. Since the first angle θ1 is an obtuse angle, the same effect can be obtained by acting in the same manner as in the first embodiment.

[Second Embodiment]
A second embodiment of the present invention will be described. Here, differences from the first embodiment will be described, and the same portions will be denoted by the same reference numerals and description thereof will be omitted. FIG. 15 shows an enlarged view of a cross section of the merging portion 100 according to this embodiment. In the first embodiment, since the connection pipe line 152 of the water supply pipe member 150 has a cylindrical shape, the second central axis 160 and the first tangent line 162 are parallel to each other. On the other hand, in this embodiment, the connection pipe line 152 of the water supply pipe line member 150 has a truncated cone shape.

  Also in the present embodiment, the central axis of the air supply conduit member 120 is the first central axis 130, and the central axis of the connection conduit 152 of the water supply conduit member 150 is the second central axis 160. A tangent at the intersection of the inner wall on the distal end side of the connection pipe line 152 on the plane passing through the first central axis 130 and the second central axis 160 and the first pipe line 122 is defined as a first tangent line 162. An intersection between the first central axis 130 and the first tangent 162 is defined as a first intersection 164. A half straight line exiting from the first intersection point 164 toward the air supply conduit 210 toward the proximal end on the first central axis 130, and a first tangent line 162 exiting from the first intersection point 164 toward the connection conduit 152 side An angle formed with the half line is defined as a first angle θ1. At this time, the first angle θ1 is an obtuse angle.

  A tangent at the intersection of the inner wall on the proximal end side of the connection pipe line 152 in the plane passing through the first central axis 130 and the second central axis 160 and the first pipe line 122 is defined as a second tangent line 166. An intersection point of the first central axis 130 and the second tangent line 166 is defined as a second intersection point 168. A half line on the first central axis 130 exiting from the second intersection point 168 toward the air supply conduit 210 and a half line on the second tangent line 166 exiting from the second intersection point 168 toward the connection conduit 152 side are formed. Let the angle be the second angle θ2. This second angle θ2 may be any angle. The shape shown in FIG. 15 or the shape shown in FIG. 16 may be used. Other configurations are the same as those of the first embodiment.

  The obtuse angle of the first angle θ1 particularly contributes to retaining the water 54 in the water supply conduit 240. Therefore, the present embodiment acts similarly to the case of the first embodiment, and the same effect can be obtained.

  The second angle θ2 may be any angle, but it is preferable that the second angle is an obtuse angle because the area of the tip opening 154 increases and the flow of water in the water supply state becomes smooth. Further, it is preferable that the second angle θ2 is an obtuse angle because air flows into the water supply pipe member 150 in the air supply state, and water leakage from the water supply pipe member 150 is suppressed.

[Third Embodiment]
A third embodiment of the present invention will be described. Here, differences from the first embodiment will be described, and the same portions will be denoted by the same reference numerals and description thereof will be omitted. FIG. 17 shows an enlarged view of a cross section of the merging portion 100 according to the present embodiment. As shown in this figure, in the merging portion 100 of the present embodiment, the wall of the connection line 152 of the water supply line member 150 protrudes by a length L into the first line 122 of the air supply line member 120. Yes. That is, the front end surface 156 is located in the first conduit 122.

  Also in the present embodiment, the tangent at the intersection with the first pipe 122 on the inner wall on the distal end side of the connecting pipe 152 in the plane passing through the first central axis 130 and the second central axis 160 is the first tangent. 162. An intersection between the first central axis 130 and the first tangent 162 is defined as a first intersection 164. A half line on the first central axis 130 exiting from the first intersection point 164 toward the air supply conduit 210 and a half line on the first tangent line 162 exiting from the first intersection point 164 toward the connection conduit 152 side The angle is a first angle θ1. At this time, the first angle θ1 is an obtuse angle.

  Other configurations are the same as those of the first embodiment. Since the first angle θ1 is an obtuse angle, the same effect can be obtained by acting in the same manner as in the first embodiment.

  Note that the inner wall on the base end side of the distal end opening 154 of the water supply pipe member 150 in the plane passing through the first central axis 130 and the second central axis 160 is inside the air supply pipe 210 as shown in FIG. Or may not protrude as shown in FIG. As shown in FIG. 18, when the tip of the water supply pipe member 150 protrudes into the air supply pipe 210, the effect of pushing back the water in the water supply pipe 240 by the air passed through the air supply pipe 210 is particularly high. A particularly high water stop effect is obtained.

  Note that the present invention is not limited to the above-described embodiment as it is, and can be embodied by modifying the constituent elements without departing from the scope of the invention in the implementation stage. In addition, various inventions can be formed by appropriately combining a plurality of components disclosed in the embodiment. For example, even if some constituent elements are deleted from all the constituent elements shown in the embodiment, the problem described in the column of problems to be solved by the invention can be solved and the effect of the invention can be obtained. The configuration in which this component is deleted can also be extracted as an invention. Furthermore, constituent elements over different embodiments may be appropriately combined.

  DESCRIPTION OF SYMBOLS 1 ... Endoscope, 2 ... Operation part, 3 ... Insertion part, 4 ... Universal code | cord | chord part, 5 ... Soft part, 6 ... Bending part, 7 ... Hard tip part, 8 ... Illumination window, 9 ... Observation window, 10 ... Treatment instrument outlet, 11 ... Nozzle, 15 ... Connector, 16 ... Air / water switching valve, 17 ... Air pump, 18 ... Water supply tank, 19 ... Air piping, 20 ... Pressure piping, 21 ... Water supply piping, 26 ... Fluid passage, 27 ... Connection pipe, 100 ... Merging portion, 110 ... Merging member, 120 ... Air supply duct member, 122 ... First duct, 124 ... Side opening, 130 ... First central axis, 142 ... Joint 150, water supply pipe member, 151 ... second pipe, 152 ... connection pipe, 154 ... tip opening, 156 ... tip face, 158 ... adhesive, 160 ... second central axis, 162 ... first 1 tangent, 164 ... first intersection, 166 ... second tangent, 168 ... second Point 210: Air supply pipe 212: Air supply tube 222 ... Air supply tube 224: Side opening 240: Water supply pipe 242 ... Water supply tube 244 ... Water supply tube 246 ... Connection pipe 248 ... Tip opening, 270 ... air / water supply conduit, 272 ... air / water supply tube, 300 ... endoscope system.

Claims (6)

An air line configured to allow gas to pass through;
A water line configured to allow liquid to pass through;
An air / water supply line located downstream of the air / water supply line and configured to allow the gas and the liquid to pass through;
An endoscope comprising:
The air supply conduit and the air supply / water supply conduit include a first conduit,
The first conduit has a side opening;
The water supply pipe is connected to the first pipe at the side opening,
The upstream side of the side opening of the first pipe line constitutes the air supply pipe line, and the downstream side of the side opening part of the first pipe line constitutes the air supply / water supply pipe line,
The water supply conduit has a connecting line located at the engagement stream portion of the said a water supply conduit first conduit,
In a plane passing through the second central axis is the center axis of the connecting pipeline between the first central axis is the center axis of the first conduit, the inner wall of the air and water supply tubes roadside of the connection conduit When the tangent at the intersection with the first conduit is the first tangent, the first exit from the first intersection that is the intersection between the first central axis and the first tangent is the air supply conduit side. A first angle that is an angle formed by a half line on the first central axis and a half line on the first tangent line that exits from the first intersection to the connection pipe line side is an obtuse angle.
An endoscope characterized by that. In the plane passing through said second central axis and said first central axis and tangent to the second tangent at the point of intersection between the first conduit of the inner wall of the flue roadside of the connection conduit A half straight line on the first central axis coming out from the second intersection point, which is an intersection point of the first central axis and the second tangent line, to the air supply line side, and the connection from the second intersection point The endoscope according to claim 1, wherein the second angle that is an angle formed by the half line on the second tangent line that exits to the duct side is an obtuse angle.   The endoscope according to claim 1 or 2, wherein the inner wall of the connection pipe line on the air / water supply pipe line side is provided along the first tangent line. 2. The endoscope according to claim 1 , wherein an end portion of the connection pipeline on the first pipeline side protrudes into the first pipeline at least on the air / water supply pipeline side . mirror. An air supply conduit member including the first conduit;
A water supply pipe member including the connection pipe and connected to the side opening of the first pipe at one end;
A water supply tube connected to the other end of the water supply conduit member;
An air supply tube connected to one end of the air supply line member;
An air / water supply tube connected to the other end of the air supply duct member;
With
The upstream side of the side opening of the air supply duct member and the air supply tube constitute the air supply duct,
The air supply / water supply tube and the air supply / water supply tube downstream of the side opening of the air supply line member constitute the air supply / water supply line,
The endoscope according to claim 1, wherein the water supply conduit member and the water supply tube constitute the water supply conduit .   The endoscope according to claim 5, wherein the air supply duct member and the water supply duct member are harder than the air supply tube, the water supply tube, and the air / water supply tube.

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