JP5704959B2 - Endoscope branch tube - Google Patents

Description

  The present invention relates to an endoscope branch pipe used for an endoscope.

  Generally, a channel tube is provided in the insertion portion of the endoscope along the longitudinal direction. The proximal end of the channel tube is connected to the endoscope branch tube inside the operation section. The branch tube for an endoscope includes three tubular portions. The three tubular portions extend from one branch portion in different directions with respect to each other. A first tubular portion, which is one of the three tubular portions, is connected to a channel base that defines a treatment instrument insertion port. The second tubular portion, which is another one of the three tubular portions, is connected to the suction pipe. A third tubular portion, which is another one of the three tubular portions, is connected to the channel tube. The suction pipe is connected to a suction connector provided on the surface of the operation unit via a suction tube or the like. With this configuration, the treatment instrument insertion channel through which the treatment instrument is inserted is defined by the channel tube, the third tubular portion, the first tubular portion, and the channel cap. Further, a suction channel through which a residue to be sucked passes is defined by the channel tube, the third tubular portion, the second tubular portion, the suction pipe, and the suction tube. Therefore, the shared channel shared as the treatment portion insertion channel and the suction channel inside the channel tube is branched into the treatment instrument insertion channel and the suction channel by the branch tube for endoscope.

  As an endoscope branch pipe for branching a shared channel into a treatment instrument insertion channel and a suction channel, Patent Document 1 discloses an endoscope branch pipe formed of metal. Since this endoscope branch pipe is made of metal, it is an endoscope for collision with the inner surface of the inserted object such as a treatment tool and a cleaning brush repeatedly inserted and removed, and friction between the inserted object and the inner surface. The strength of the mirror branch pipe is secured. Therefore, the insert is smoothly inserted through the branch tube for endoscope. Further, even when the inserted article is repeatedly inserted, the inner surface of the branch pipe for endoscope is not easily worn.

JP 11-47083 A

  The endoscope branch pipe formed of the metal of Patent Document 1 is connected to the channel tube, the channel cap, and the suction pipe by welding. At this time, in order to secure the dimension of the welded portion, the branch pipe for endoscope is enlarged. The endoscope branch pipe, which is a member formed of metal, is enlarged, and the endoscope branch pipe is increased in weight. In recent years, the operation time using an endoscope has been prolonged. Therefore, from the viewpoint of the workability of the operation, it is not preferable to increase the weight of the branch pipe for endoscope.

  By forming the branch pipe for endoscope from resin, it is possible to reduce the weight of the branch pipe for endoscope. However, in the endoscope branch pipe formed of resin, the strength of the endoscope branch pipe with respect to the collision of the insert with the inner surface and the friction between the insert and the inner surface is reduced. Therefore, the insertability when the insert is inserted through the endoscope branch tube is reduced. In addition, when the inserted article is repeatedly inserted, the inner surface of the branch pipe for endoscope is easily worn.

  The present invention has been made by paying attention to the above-mentioned problems, and the object of the present invention is to ensure the strength against the collision between the insert and the inner surface of the insert, and to reduce the weight. It is an object of the present invention to provide an endoscopic branch pipe and a method for manufacturing the same.

In order to achieve the above object, in one aspect of the present invention, a branch portion, and a first tubular portion, a second tubular portion, and a third tubular portion that are branched from the branch portion and formed from a resin are provided. A Y-shaped branch pipe main body, a cylindrical part formed of a metal connected to the third tubular part of the branch pipe main body, the inside of the third tubular part from the cylindrical part, and the extended inside of said second tubular portion through the interior of the branch portion to the tube opening, the branch pipe axis of said first tubular portion is in the first position it hits the inside of the branch pipe body A first bent plate portion formed of metal having a first metal inner surface portion passing through an inner peripheral surface from the main body; and passing through the inside of the third tubular portion and the inside of the branch portion from the cylindrical portion. The inside of the first tubular portion is extended to the tube opening, and the axis of the second tubular portion is the inside of the branch pipe body. A second bent plate portion formed of metal having a second metal inner surface portion that passes through an inner peripheral surface from the branch pipe body at the second position where it abuts; An endoscope branch pipe comprising: a curved plate portion and an inner surface portion of a branch tube main body formed of a resin formed in a portion other than the first curved plate portion and the second curved plate portion .
In another embodiment of the present invention, the cylindrical portion, the first curved plate portion extending from the cylindrical portion, and the first curved plate portion around the axis of the cylindrical portion are separated from the first curved plate portion. Forming a second curved plate portion extending from the cylindrical portion from a metal, and forming a first pin along the second curved plate portion and a second along the first curved plate portion. The third pin is inserted from the cylindrical portion, and between the respective pins, and between each of the pins and the first curved plate portion or the second curved plate portion. The three bent pins and the first curved plate in a state in which the resin does not flow into the inner peripheral side of the first curved plate portion and the second curved plate portion. And the second curved plate portion are coated with the resin, and a branched portion, and a first tubular portion, a second tubular portion, and a third tubular portion branched from the branched portion, Forming a branch pipe body comprising the resin in an Y-shape with an acute angle between the first tubular portion and the second tubular portion, and removing the three pins. the provided, that provide a manufacturing method of an endoscope branch pipe.

  According to the present invention, there is provided a branch pipe for an endoscope which can secure a strength against collision of the inserted article against the inner surface and friction between the inserted article and the inner surface, and a manufacturing method thereof. be able to.

1 is a schematic diagram showing an endoscope system according to a first embodiment of the present invention. FIG. Sectional drawing which shows schematically the internal structure of the holding | maintenance part casing of the endoscope which concerns on 1st Embodiment. The perspective view which shows the branch pipe for endoscopes which concerns on 1st Embodiment. Sectional drawing which shows the branch pipe for endoscopes which concerns on 1st Embodiment. VV sectional view taken on the line of FIG. Sectional drawing which shows roughly the locus | trajectory of the insertion thing penetrated to a common channel via the treatment tool penetration channel or suction channel of the endoscope which concerns on 1st Embodiment. The perspective view which shows the state which inserted three pins in the connection cap, the 1st curved board part, and the 2nd curved board part in the manufacturing method with the branch pipe for endoscopes which concerns on 1st Embodiment. Sectional drawing which shows the state which coat | covered resin to the three pins, the 1st curved board part, and the 2nd curved board part from the state of FIG. Schematic explaining the manufacturing method different from the manufacturing method of FIG.7 and FIG.8 of the branch pipe for endoscopes which concerns on 1st Embodiment. Sectional drawing which shows the branch pipe for endoscopes which concerns on the 2nd Embodiment of this invention. The perspective view which shows the state which formed the metal body which provides a connection nozzle | cap | die, a 1st curved board part, and a 2nd curved board part in the manufacturing method with the branch pipe for endoscopes which concerns on 1st Embodiment. 11 shows a state in which three pins are inserted into the metal body, and the three pins, the first curved plate portion, the second curved plate portion, and the third curved plate portion are covered with resin. Sectional drawing. Sectional drawing which shows the branch pipe for endoscopes which concerns on the modification of 1st Embodiment and 2nd Embodiment.

(First embodiment)
A first embodiment of the present invention will be described with reference to FIGS.

  FIG. 1 is a diagram illustrating a system of an endoscope 1 according to the present embodiment. As shown in FIG. 1, the endoscope 1 includes an insertion portion 2 that is inserted into a body cavity and extends in the longitudinal direction, and a proximal end of the insertion portion 2, as shown in FIG. 1. And an operation unit 3 having a tip connected to the main body. One end of a universal cord 4 is connected to the operation unit 3. A scope connector (not shown) is provided at the other end of the universal cord 4.

  An imaging element (not shown) such as a CCD is provided at the distal end of the insertion portion 2. The tip of an electric signal line (not shown) is connected to the image sensor. The electric signal line passes through the inside of the insertion portion 2, the inside of the operation portion 3, and the inside of the universal cord 4, and the base end is connected to an image processing unit (not shown) such as an image processor via a scope connector. . In addition, a light guide (not shown) that guides light for irradiating the subject extends from the distal end portion of the insertion portion 2 along the longitudinal direction inside the insertion portion 2. The light guide passes through the inside of the operation unit 3 and the inside of the universal cord 4, and the base end is connected to a light source unit (not shown) via a scope connector.

  The operation unit 3 includes an operation unit casing 7 and a holding unit casing 9 provided on the distal direction side of the operation unit casing 7. The operation section casing 7 is provided with a bending lever (curving operation section) 11 that performs a bending operation of the bending section provided in the insertion section 2, and a remote switch 13 that performs remote operation of the image processing unit. The operation unit casing 7 is provided with a suction button 15. One end of an external suction tube 17 is connected to the suction button 15. The other end of the external suction tube 17 is connected to a suction unit 18 such as a suction control unit or a suction pump. The holding portion casing 9 is formed with a treatment instrument insertion port 19 into which a treatment instrument or the like is inserted.

  FIG. 2 is a diagram illustrating an internal configuration of the holding portion casing 9. As shown in FIG. 2, the holding portion casing 9 includes a main cylindrical portion 21 extending in the longitudinal direction and a branched cylindrical portion that branches from the main cylindrical portion 21 in a direction that forms an acute angle with respect to the proximal direction. 23. A channel cap (treatment instrument insertion portion) 25 is inserted into the branched cylindrical portion 23. The treatment tool insertion port 19 is defined by the channel cap 25. The channel cap 25 is fixed inside the branch cylindrical portion 23 via O-rings 27A and 27B. The space between the branch cylindrical portion 23 and the channel base 25 is sealed by the O-rings 27A and 27B.

  A channel tube 29 is provided in the insertion portion 2 along the longitudinal direction. As shown in FIG. 2, the base end of the channel tube 29 extends to the inside of the holding portion casing 9.

  A suction pipe 31 is provided inside the main cylindrical portion 21 of the holding portion casing 9. A suction cap 33 is formed at the base end of the suction pipe 31. A tip of a suction tube 35 is connected to the suction cap 33. The proximal end of the suction tube 35 is connected to the suction button 15. The inside of the suction tube 35 communicates with the inside of the external suction tube 17 by the suction button 15.

  An endoscope branch pipe 37 is provided inside the holding portion casing 9. 3 and 4 are diagrams showing the configuration of the branch pipe 37 for an endoscope. As shown in FIGS. 3 and 4, the endoscope branch pipe 37 includes a branch pipe main body 41 formed of a resin in a Y shape. The branch pipe main body 41 includes a branch portion 43 and a first tubular portion 45A, a second tubular portion 45B, and a third tubular portion 45C branched from the branch portion 43. The three tubular portions 45A, 45B, and 45C branch from the branch portion 43 in different directions with respect to each other. The angle α between the first tubular portion 45A and the second tubular portion 45B is an acute angle. The angle β between the first tubular portion 45A and the third tubular portion 45C is an obtuse angle. The angle γ between the second tubular portion 45B and the third tubular portion 45C is an obtuse angle.

  As shown in FIG. 2, the first tubular portion 45 </ b> A is connected to the channel base 25. The first tubular portion 45 </ b> A and the channel base 25 are hermetically connected by a seal member 47. The tip of the suction pipe 31 is connected to the second tubular portion 45B. As shown in FIGS. 2 to 4, the endoscope branch tube 37 includes a connection base (cylindrical portion) 49 connected to the third tubular portion 45 </ b> C of the branch tube main body 41. The connection cap 49 is made of metal. The connection cap 49 is connected to the proximal end of the channel tube 29 by a fastening ring 51. Thereby, the inside of the third tubular portion 45 </ b> C communicates with the inside of the channel tube 29.

  By connecting the first tubular portion 45A, the second tubular portion 45B, and the third tubular portion 45C as described above, as shown in FIG. 2, the channel tube 29, the third tubular portion 45C, the first tubular portion 45C, The treatment instrument insertion channel through which the treatment instrument is inserted is defined by the tubular portion 45A and the channel cap 25. Further, the channel tube 29, the third tubular portion 45C, the second tubular portion 45B, the suction pipe 31 and the suction tube 35 define a suction channel through which a residue sucked when the suction unit 18 is driven passes. . Residues and the like that have passed through the suction tube 38 are sucked into the suction unit 18 through the inside of the external suction tube 17. As described above, in the channel tube 29, the common channel S1 shared as the treatment portion insertion channel and the suction channel is formed. Then, the shared channel S1 is branched into the treatment instrument insertion channel S2 and the suction channel S3 by the endoscope branch tube 30.

  As shown in FIGS. 3 and 4, the endoscope branch pipe 37 includes a first curved plate portion 53 </ b> A and a second curved plate portion 53 </ b> B extending from the connection base 49. 5 is a cross-sectional view taken along line VV in FIG. As shown in FIGS. 3 and 5, the second curved plate portion 53 </ b> B extends around the axis C <b> 3 of the connection base 49 in a state of being separated from the first curved plate portion 53 </ b> A. The first curved plate portion 53A and the second curved plate portion 53B are made of metal. The first curved plate portion 53A extends through the inside of the third tubular portion 45C and the inside of the branch portion 43 to the inside of the second tubular portion 45B. Further, the second curved plate portion 53B extends through the inside of the third tubular portion 45C and the inside of the branch portion 43 to the inside of the first tubular portion 45A. That is, the first curved plate portion 53 </ b> A and the second curved plate portion 53 </ b> B are extended in a state in which the first curved plate portion 53 </ b> A and the second curved plate portion 53 </ b> B are opened from each other as the distance from the connection base 49 increases. An inner surface of metal is formed at a portion where the first curved plate portion 53A and the second curved plate portion 53B are extended.

  In the vicinity of the first position A1 and the first position A1 where the first axis C1 that is the axis of the first tubular portion 45A hits the branch pipe body 41, the first curved plate portion 53A is the branch pipe body 41. It passes through the inner circumference. Thereby, the metal inner surface is formed by the first curved plate portion 53A in the vicinity of the first position A1 and the first position A1 (first metal inner surface portion). In addition, the second curved plate portion 53B is a branch pipe in the vicinity of the second position A2 and the second position A2 where the second axis C2 which is the axis of the second tubular portion 45B hits the branch pipe main body 41. It passes the inner peripheral side from the main body 41. Thereby, the metal inner surface is formed by the second curved plate portion 53B in the vicinity of the second position A2 and the second position A2 (second metal inner surface portion). And the part by which the inner surface is formed by the branch pipe main body 41 is provided in parts other than the 1st curved plate part 53A and the 2nd curved plate part 53B.

  FIG. 6 is a diagram illustrating the trajectories of the insertion objects 55 and 57 that are inserted into the shared channel S1 via the treatment instrument insertion channel S2 or the suction channel S3. As shown in FIG. 6, an insertion object 55 such as a treatment instrument inserted from the treatment instrument insertion port 19 passes through the inside of the first tubular portion 45 </ b> A and is in the vicinity of the first position A <b> 1 or the first position A <b> 1. The tip hits. Then, the insert 55 is inserted through the channel tube 29 through the third tubular portion 45C. As described above, the tip of the insertion object 55 inserted from the treatment instrument insertion port 19 frequently collides with the first position A1 or the vicinity of the first position A1. In the present embodiment, since the inner surface of the metal is formed by the first curved plate portion 53A, the strength against the collision with the inner surface of the insert 55 near the first position A1 and the first position A1 is ensured. Is done.

  In addition, the insertion object 57 such as a cleaning brush that is inserted through the suction pipe 31 passes through the inside of the second tubular portion 45B, and the front end of the insertion object 57 approaches the second position A2 or the vicinity of the second position A2. . Then, the insertion object 57 is inserted into the channel tube 29 through the third tubular portion 45C. As described above, the tip of the insertion object 57 inserted through the suction pipe 31 frequently collides with the second position A2 or the vicinity of the second position A2. In the present embodiment, since the inner surface of the metal is formed by the second curved plate portion 53B, the strength against the collision with the inner surface of the insert 57 in the vicinity of the second position A2 and the second position A2 is ensured. Is done.

  As shown in FIG. 6, when the insert 55 is inserted or removed from the treatment instrument insertion port 19, a portion of the insert 55 located inside the first tubular portion 45 </ b> A may come into contact with the inner surface. . By moving the insert 55 in contact with the inner surface, friction is generated between the insert 55 and the inner surface. Here, the second curved plate portion 53B extends to the inside of the first tubular portion 45A. For this reason, in the portion where the inner surface is formed by the second curved plate portion 53B, the strength against the friction between the insert 55 and the inner surface is sufficiently ensured. However, the force applied to the inner surface due to friction is smaller than the force applied to the inner surface due to the collision of the tip of the insert 55. For this reason, even in a portion where the inner surface is formed by the resin forming the branch pipe body 41, a certain degree of strength against friction between the insert 55 and the inner surface is ensured.

  Further, when the insert 57 is inserted or removed through the suction pipe, a portion of the insert 57 located inside the second tubular portion 45B may come into contact with the inner surface. By moving the insert 57 in contact with the inner surface, friction is generated between the insert 57 and the inner surface. Here, the first curved plate portion 53A extends to the inside of the second tubular portion 45B. For this reason, in the portion where the inner surface is formed by the first curved plate portion 53A, the strength against friction between the insert 57 and the inner surface is sufficiently ensured. However, the force applied to the inner surface due to friction is smaller than the force applied to the inner surface due to the collision of the tip of the insert 57. For this reason, the strength with respect to the friction between the insert 57 and the inner surface is ensured to some extent even at the portion where the inner surface is formed by the resin forming the branch pipe main body 41.

  Next, the manufacturing method of the branch pipe 37 for endoscopes is demonstrated. 7 and 8 are views for explaining a method of manufacturing the endoscope branch pipe 37. FIG. In this manufacturing method, first, the connection base 49, the first curved plate portion 53A, and the second curved plate portion 53B are formed from metal. At this time, the second curved plate portion 53 </ b> B is extended around the axis C <b> 3 of the connection base 49 in a state separated from the first curved plate portion 53 </ b> A. Further, the first curved plate portion 53 </ b> A and the second curved plate portion 53 </ b> B are extended so as to be opened from each other as the distance from the connection base 49 increases.

  Then, as shown in FIG. 7, the three pins 61 </ b> A to 61 </ b> C are inserted into the integrally formed connection base 49, the first curved plate portion 53 </ b> A, and the second curved plate portion 53 </ b> B. The first pin 61A is inserted along the second curved plate portion 53B. The second pin 61B is inserted along the first curved plate portion 53A. The third pin 61C is inserted from the connection base 49. And the state which contact | abuts between each pin 61A-61C without gap is formed. At this time, the respective pins 61A to 61C and the first curved plate portion 53A or the second curved plate portion 53B are also formed in contact with each other without a gap.

  In this state, as shown in FIG. 8, the three pins 61A to 61C, the first curved plate portion 53A, and the second curved plate portion 53B are covered with resin. At this time, since the pins 61A to 61C and between the respective pins 61A to 61C and the first curved plate portion 53A or the second curved plate portion 53B are in contact with no gap, the resin is first It does not flow into the inner peripheral side of the first curved plate portion 53A and the second curved plate portion 53B. By coating the resin, the branch pipe body 41 including the branch portion 43 and the first tubular portion 45A, the second tubular portion 45B, and the third tubular portion 45C branched from the branch portion 43 is formed from the resin. The The branch pipe main body 41 is formed in a Y shape with an acute angle α between the first tubular portion 45A and the second tubular portion 45B.

  When the branch pipe main body 41 is formed, the connection cap 49 is connected to the third tubular portion 45C. The first curved plate portion 53A extends from the connection base 49 through the inside of the third tubular portion 45C and the inside of the branching portion 43 to the inside of the second tubular portion 45B, and extends to the extended portion. Form the inner surface of the metal. The second curved plate portion 53B extends from the connection base 49 to the inside of the first tubular portion 45A through the inside of the third tubular portion 45C and the inside of the branching portion 43 in this order. Form the inner surface of the metal. The connection base 49, the first curved plate portion 53A and the second curved plate portion 53B are formed and disposed at the time of covering with the resin. The connection base 49 and the first curved plate portion when the branch pipe main body 41 is formed. This is performed in consideration of the configuration of 53A and the second curved plate portion 53B.

  Then, the three pins 61A to 61C are removed. The endoscope branch pipe 37 is formed as described above.

  FIG. 9 is a view for explaining a manufacturing method different from that of FIGS. 7 and 8 for the branch pipe 37 for an endoscope. In this manufacturing method, similarly to the manufacturing method of FIGS. 7 and 8, the connection cap 49, the first curved plate portion 53A, and the second curved plate portion 53B are formed from metal. Further, the branch pipe main body 41 is formed of resin separately from the connection base 49, the first curved plate portion 53A, and the second curved plate portion 53B.

  Then, as shown in FIG. 9, the first curved plate portion 53 </ b> A and the second curved plate portion 53 </ b> B are inserted into the branch pipe main body 41 from the third tubular portion 45 </ b> C while being bent. The first curved plate portion 53A and the second curved plate portion 53B are inserted until the connection cap 49 is connected to the third tubular portion 45C.

  When the connection base 49 is connected to the third tubular portion 45C, the first curved plate portion 53A passes through the connection base 49, the third tubular portion 45C, and the branch portion 43 in order. 2 extends to the inside of the tubular portion 45B, and an inner surface of the metal is formed at the extended portion. Further, the second curved plate portion 53B extends from the connection base 49 to the inside of the first tubular portion 45A through the inside of the third tubular portion 45C and the inside of the branch portion 43 in order. The inner surface of the metal is formed at the site. The first bent plate portion 53A and the second bent plate portion 53B are formed and inserted into the branch pipe main body 41. The first bent plate portion 53A when the connection base 49 is connected to the third tubular portion 45C. And it considers the structure of the 2nd curved plate part 53B.

  By using this manufacturing method, the connection base 49, the first curved plate portion 53A, and the second curved plate portion 53B are detached from the branch pipe main body 41, easily attached to another branch pipe main body 41, Can be used. Therefore, even when the resin branch pipe body 41 is discarded, the metal connection base 49, the first curved plate portion 53A, and the second curved plate portion 53B are attached to another branch pipe main body 41 to effectively It can be reused.

  Accordingly, the endoscope branch pipe 37 and the method for manufacturing the endoscope branch pipe 37 having the above-described configuration have the following effects. In other words, in the endoscope branch pipe 37, the first axis C1, which is the axis of the first tubular portion 45A, hits the branch pipe main body 41 in the vicinity of the first position A1 and the first position A1. One curved plate portion 53 </ b> A passes through the inner peripheral side from the branch pipe main body 41. Thereby, the metal inner surface is formed by the first curved plate portion 53A in the vicinity of the first position A1 and the first position A1. The tip of the insertion object 55 inserted from the treatment instrument insertion port 19 frequently collides with the first position A1 or the vicinity of the first position A1. In the present embodiment, since the inner surface of the metal is formed by the first curved plate portion 53A, the strength against the collision with the inner surface of the insert 55 near the first position A1 and the first position A1 is ensured. can do. Similarly, in the second position A2 where the second axis C2 which is the axis of the second tubular portion 45B hits the branch pipe main body 41 and in the vicinity of the second position A2, the insert 57 which frequently collides is inserted. The strength against the collision with the surface can be ensured.

  Further, in the endoscope branch pipe 37, a branch pipe main body 41 constituting most of the endoscope branch pipe 37 is made of resin. For this reason, weight reduction of the branch pipe 37 for endoscopes is realizable.

  Moreover, in the branch pipe 37 for endoscopes, the insertion object 55 and the inner surface are moved by moving the insertion object 55 in a state where the portion located inside the first tubular portion 45A of the insertion object 55 is in contact with the inner surface. Friction may occur between the two. In the present embodiment, the second curved plate portion 53B extends to the inside of the first tubular portion 45A. For this reason, in the part in which an inner surface is formed by the 2nd curved plate part 53B, the intensity | strength with respect to the friction between the insert 55 and an inner surface is fully securable. The same applies to the friction between the portion located inside the second tubular portion 45B of the insert 57 and the inner surface. In the portion where the inner surface is formed by the first curved plate portion 53A, the insert 57 is inserted. And sufficient strength against friction between the inner surface and the inner surface.

(Second Embodiment)
Next, a second embodiment will be described with reference to FIGS. In addition, the same code | symbol is attached | subjected about the part which has the same function as 1st Embodiment, and the same function, and the description is abbreviate | omitted.

  FIG. 10 is a diagram showing an endoscope branch pipe 37 according to the present embodiment. The endoscope branch pipe 37 according to the present embodiment includes a third curved plate portion 53C in addition to the first curved plate portion 53A and the second curved plate portion 53B. The third curved plate portion 53C extends from the inside of the first tubular portion 45A through the inside of the branch portion 43 to the inside of the second tubular portion 45B. And the metal inner surface is formed in the site | part in which the 3rd curved board part 53C is extended. Inside the first tubular portion 45A, the third curved plate portion 53C extends from the second curved plate portion 53B around the first axis C1. Inside the second tubular portion 45B, a third curved plate portion 53C extends from the first curved plate portion 53A around the second axis C2.

  As described above, by moving the insert 55 in a state where the portion of the insert 55 located inside the first tubular portion 45A is in contact with the inner surface, friction is caused between the insert 55 and the inner surface. May occur. In the present embodiment, in addition to the second curved plate portion 53B, a third curved plate portion 53C is extended inside the first tubular portion 45A. For this reason, in the part in which an inner surface is formed of the 2nd curved plate part 53B and the 3rd curved plate part 53C, the intensity | strength with respect to the friction between the insert 55 and an inner surface is fully ensured.

  Similarly, friction is generated between the insert 57 and the inner surface by moving the insert 57 in a state where the portion of the insert 57 located inside the second tubular portion 45B is in contact with the inner surface. Sometimes. In the present embodiment, in addition to the first curved plate portion 53A, a third curved plate portion 53C extends inside the second tubular portion 45B. For this reason, in the portion where the inner surface is formed by the first curved plate portion 53A and the third curved plate portion 53C, the strength against friction between the insert 57 and the inner surface is sufficiently ensured.

  Next, the manufacturing method of the branch pipe 37 for endoscopes is demonstrated. 11 and 12 are views for explaining a method of manufacturing the endoscope branch pipe 37. In this manufacturing method, first, an integral metal body 63 is formed as shown in FIG. The metal body 63 includes a connection base 49, a first curved plate portion 53A, a second curved plate portion 53B, and a third curved plate portion 53C. In the metal body 63, the second curved plate portion 53 </ b> B is extended around the axis C <b> 3 of the connection base 49 in a state of being separated from the first curved plate portion 53 </ b> A. Further, the first curved plate portion 53 </ b> A and the second curved plate portion 53 </ b> B are extended so as to be opened from each other as the distance from the connection base 49 increases.

  The metal body 63 includes a first cylindrical portion 65A and a second cylindrical portion 65B. A first extended curved plate portion 67A extends from the first curved plate portion 53A between the second cylindrical portion 65B and the first curved plate portion 53A. A second extended curved plate portion 67B extends from the second curved plate portion 53B between the first cylindrical portion 65A and the second curved plate portion 53B. Further, a third extended curved plate portion 67C is extended from the third curved plate portion 53C between the third curved plate portion 53C and the second cylindrical portion 65B. A fourth extended curved plate portion 67D extends from the third curved plate portion 53C between the third curved plate portion 53C and the first cylindrical portion 65A. The third curved plate portion 53C and the third extended curved plate portion 67C are separated from the first curved plate portion 53A and the first extended curved plate portion 67A about the axis of the second cylindrical portion 65B. It is extended. The third curved plate portion 53C and the fourth extended curved plate portion 67D are separated from the second curved plate portion 53B and the second extended curved plate portion 67B about the axis of the first cylindrical portion 65A. The state is extended.

  Then, as described above in the first embodiment, the three pins 61A to 61C are inserted. At this time, the first pin 61A is inserted from the first cylindrical portion 65A, and the second pin 61B is inserted from the second cylindrical portion 65B. And the state which contact | abuts between each pin 61A-61C without gap is formed. At this time, each of the pins 61A to 61C and the first curved plate portion 53A, the second curved plate portion 53B, or the third curved plate portion 53C are also formed in contact with each other without a gap.

  In this state, as shown in FIG. 12, the three pins 61A to 61C, the first curved plate portion 53A, the second curved plate portion 53B, and the third curved plate portion 53C are covered with resin. At this time, there is no gap between the pins 61A to 61C and between each of the pins 61A to 61C and the first curved plate portion 53A, the second curved plate portion 53B, or the third curved plate portion 53C. Since they are in contact with each other, the resin does not flow into the inner peripheral side of the first curved plate portion 53A, the second curved plate portion 53B, and the third curved plate portion 53C. By coating the resin, the branch pipe body 41 including the branch portion 43 and the first tubular portion 45A, the second tubular portion 45B, and the third tubular portion 45C branched from the branch portion 43 is formed from the resin. The The branch pipe main body 41 is formed in a Y shape with an acute angle α between the first tubular portion 45A and the second tubular portion 45B. At this time, the connection base 49, the first curved plate portion 53 </ b> A, the second curved plate portion 53 </ b> B, and the third curved plate portion 53 </ b> C are arranged as described above with respect to the branch pipe body 41.

  The first cylindrical portion 65A, the second cylindrical portion 65B, the first extended curved plate portion 67A, the second extended curved plate portion 67B, the third extended curved plate portion 67C, and the fourth extended curved plate portion. 67D is excised. That is. The second cylindrical portion 65B, the first extended curved plate portion 67A, and the third extended curved plate portion 67C are separated at the position of the dotted line B1 in FIG. Further, the first cylindrical portion 65A, the second extended curved plate portion 67B, and the fourth extended curved plate portion 67D are separated at the position of the dotted line B2 in FIG.

  Then, the three pins 61A to 61C are removed. The endoscope branch pipe 37 is formed as described above.

  Therefore, in addition to the same effects as those of the first embodiment, the endoscope branch pipe 37 and the method for manufacturing the endoscope branch pipe 37 having the above-described configuration have the following effects. That is, in the endoscope branch pipe 37, the insertion object 55 and the inner surface are moved by moving the insertion object 55 in a state where the portion located inside the first tubular portion 45 </ b> A of the insertion object 55 is in contact with the inner surface. Friction may occur between the two. In the present embodiment, in addition to the second curved plate portion 53B, a third curved plate portion 53C is extended inside the first tubular portion 45A. For this reason, in the part in which an inner surface is formed of the 2nd curved plate part 53B and the 3rd curved plate part 53C, the intensity | strength with respect to the friction between the insert 55 and an inner surface is fully securable. The same applies to the friction between the inner surface of the insert 57 and the portion located inside the second tubular portion 45B, and the inner surface is formed by the first curved plate portion 53A and the third curved plate portion 53C. In the portion to be provided, sufficient strength against friction between the insert 57 and the inner surface can be secured.

(Modification)
In the first embodiment and the second embodiment, the first curved plate portion 53A and the second curved plate portion 53B are extended from the connection base 49, but the present invention is not limited to this. As a modification, as shown in FIG. 13, the first curved plate portion 53 </ b> A and the second curved plate portion 53 </ b> B may be provided in a state separated from the connection base 49. Also in this modified example, the first curved plate portion 53A is provided in the vicinity of the first position A1 and the first position A1 where the first axis C1 which is the axis of the first tubular portion 45A hits the branch pipe main body 41. Passes through the inner peripheral side of the branch pipe body 41 and forms the inner surface of the metal. Further, the second bent plate portion 53B is formed in the vicinity of the second position A2 and the second position A2 where the second axis C2 which is the axis of the second tubular portion 45B hits the branch tube main body 41. An inner surface of the metal is formed through the inner peripheral side from the main body 41. That is, the first metal inner surface portion that is provided on the inner peripheral side of the branch pipe main body 41 in the vicinity of the first position A1 and the first position A1 and forms the inner surface of the metal is used as the branch pipe for endoscope. 37 may be provided. Also, the second metal inner surface portion that is provided on the inner peripheral side of the branch pipe main body 41 in the vicinity of the second position A2 and the second position A2 and forms the inner surface of the metal is the branch pipe 37 for endoscope. Should have. And the part in which an inner surface is formed with a branch pipe main body should just be provided in parts other than a 1st metal inner surface part and a 2nd metal inner surface part.

  The embodiments of the present invention have been described above. However, the present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the scope of the present invention.

  37 ... Endoscope branch tube, 41 ... Branch tube main body, 43 ... Branch portion, 45A ... First tubular portion, 45B ... Second tubular portion, 45C ... Third tubular portion, 49 ... Connection base, 53A ... 1st curved plate part, 53B ... 2nd curved plate part.

Claims (8)

A branch pipe body branched from the branch section, and formed into a Y shape with the first tubular section, the second tubular section, and the third tubular section, and formed from a resin ;
A cylindrical portion formed of a metal connected to the third tubular portion of the branch pipe body;
The cylindrical portion extends from the cylindrical portion through the inside of the third tubular portion and the inside of the branch portion to the inside of the second tubular portion, and the shaft of the first tubular portion is the branch pipe body. having a first metal in a surface portion through the inner peripheral surface than the branch pipe body in a first position it hits the inside of the first curved plate part formed of metal,
The cylindrical portion extends from the cylindrical portion through the inside of the third tubular portion and the inside of the branch portion to the inside of the first tubular portion, and the shaft of the second tubular portion is the branch pipe body. A second curved plate portion formed of metal having a second metal inner surface portion that passes through an inner peripheral surface from the branch pipe main body at a second position that hits the inside of the branch pipe body;
Inside the branch pipe body, an inner surface portion of the branch pipe body formed from a resin is formed in a portion other than the first curved plate portion and the second curved plate portion ,
An endoscopic branch tube comprising: Wherein the branch pipe main body, the angle between said first tubular portion and the second tubular portion is formed at an acute angle, endoscopic branch pipe according to claim 1. Through the interior of the inner portion or al the branch portion of the first tubular portion, extends to the interior of said second tubular portion, the first metal in the surface portion and the second to the site to be extended The branch tube for an endoscope according to claim 1 , further comprising a third curved plate portion that forms a third metal inner surface portion different from the second metal inner surface portion. A cylindrical portion, a first curved plate portion extending from the cylindrical portion, and a second extended from the cylindrical portion in a state of being separated from the first curved plate portion around an axis of the cylindrical portion. Forming the curved plate portion of the metal from metal,
A first pin is inserted along the second curved plate portion, a second pin is inserted along the first curved plate portion, and a third pin is inserted from the cylindrical portion. Forming a state in which the pins and the first curved plate portion or the second curved plate portion are in contact with each other without a gap;
In a state where resin does not flow into the inner peripheral side of the first curved plate portion and the second curved plate portion, the resin is applied to the three pins, the first curved plate portion, and the second curved plate portion. A branch pipe body comprising a branch portion and a first tubular portion, a second tubular portion, and a third tubular portion branched from the branch portion, the first tubular portion and the second tubular portion. Forming an angle between the tubular portion from the resin in an acute Y-shape;
Unplugging the three pins,
The manufacturing method of the branch pipe for endoscopes which comprises this. When the branch pipe body is formed, the cylindrical portion is in a state of being connected to said third tubular portion, the arrangement of the cylindrical portion of the formation and coating of the resin of the cylindrical portion is performed, wherein Item 5. The production method according to Item 4 . When the branch pipe body is formed, the first curved plate portion passes from the cylindrical portion to the inside of the third tubular portion and the inside of the branch portion in order to the inside of the second tubular portion. The first curved plate portion is formed and the first curved plate portion is disposed at the time of coating the resin in a state in which the inner surface of the metal is formed in the extended portion and the extended portion is formed,
When the branch pipe body is formed, the second curved plate portion passes from the cylindrical portion to the inside of the third tubular portion and the inside of the branch portion in order to the inside of the first tubular portion. extending, in a state of forming the inner surface of the metal portion that extends, the arrangement of the second curved plate portion of the formation and coating of the resin of the second curved plate portion is performed, wherein Item 5. The production method according to Item 4 . A cylindrical portion, a first curved plate portion extending from the cylindrical portion, and a second extended from the cylindrical portion in a state of being separated from the first curved plate portion around an axis of the cylindrical portion. Forming the curved plate portion of the metal from metal,
A branch pipe body comprising a branch portion and a first tubular portion, a second tubular portion, and a third tubular portion branched from the branch portion, the first tubular portion and the second tubular portion Forming an angle between the resin in an acute Y-shape,
Until the cylindrical portion is connected to the third tubular portion, the first curved plate portion and the second curved plate portion are bent from the third tubular portion to the inside of the branch pipe main body. Inserting with
The manufacturing method of the branch pipe for endoscopes which comprises this. When the cylindrical portion is connected to the third tubular portion, the first curved plate portion sequentially passes from the cylindrical portion through the inside of the third tubular portion and the inside of the branch portion. The first bent plate portion is formed and inserted into the branch pipe main body in a state in which the inner surface of the metal is formed in the extended portion, extending to the inside of the tubular portion,
When the cylindrical portion is connected to the third tubular portion, the second curved plate portion sequentially passes from the cylindrical portion through the inside of the third tubular portion and the inside of the branch portion. It extends up to the inside of the tubular portion, in a state of forming the inner surface of the metal portion that extends, inserted into the second formation of the curved plate portion and the branch pipe body is performed, according to claim 7 The manufacturing method as described in.

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