Connector for sub-water supply mouthpiece for endoscope

Abstract

To provide an inexpensive system capable of connecting a tube unit for water supply to a sub-water supply port of an endoscope.SOLUTION: A connector 80 for a sub-water supply mouthpiece comprises a cylindrical connector body 80a made of synthetic resin, where the connector body 80a includes an insertion part 81 to be inserted in a storage space 42b of a sub-water supply mouthpiece 42, a male screw part 83 screwing into a female screw part 42c of the storage space 42b of the sub-water supply mouthpiece 42, and a step part 87 provided around a whole circumference of an outer peripheral surface of the connector body 80a between the insertion part 81 and the male screw part 83, in a central axis direction of the connector body 80a. The sub-water supply mouthpiece 42 includes a tapered surface 42f whose diameter is reduced from the female screw part 42c toward the storage space 42b, provided between the storage space 42b and the female screw part 42c in the central axial direction of the sub-water supply mouthpiece 42. The step part 87 is held in such a state that a ridge of the step part 87 provided around the whole circumference of the outer peripheral surface of the connector body 80a is pressed against the tapered surface 42f.SELECTED DRAWING: Figure 7

Description

[Technical field]

[0001] The present invention relates to a connector for an auxiliary water supply nozzle of an endoscope, to which a pump tube unit is tightened and fixed when attached to the auxiliary water supply nozzle of the endoscope. [Background technology]

[0002] In the medical field, examinations and surgeries using endoscopes are widespread. An endoscope has an opening called an auxiliary water supply port on the distal end surface of an insertion section that is inserted into a patient's body cavity. The auxiliary water supply port is provided to clean a target site in the patient's body cavity in parallel with the use of a treatment tool using the forceps channel. The auxiliary water supply port is connected to the auxiliary water supply nozzle by a dedicated channel provided inside the endoscope. When the endoscope is in use, a water supply tube unit is attached to the auxiliary water supply nozzle via a check valve unit (see, for example, Patent Document 1 and Patent Document 2). As a result, liquid fed into the endoscope via the water supply tube unit is sprayed from the auxiliary water supply port via the above-mentioned channel. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 8-238214 [Patent Document 2] JP 2005-160772 A Summary of the Invention [Problem to be solved by the invention]

[0004] As part of infection control measures, endoscopes are cleaned after each use. The check valve unit is provided as a dedicated unit that is attached to the auxiliary water supply port of the endoscope. After the check valve unit is removed from the endoscope after use and cleaned separately from the endoscope, it is attached to the auxiliary water supply port of the endoscope when the endoscope is used. Therefore, the more times the check valve unit is attached to and detached from the auxiliary water supply port of the endoscope, the worse the liquid-tightness between the check valve unit and the check valve nozzle becomes, which can lead to water leakage.

[0005] The check valve units disclosed in Patent Documents 1 and 2 are configured by attaching a rubber plug or an O-ring to a check valve mouthpiece made of a metal material such as stainless steel. While such check valve units have the advantage that they can be used repeatedly by cleaning, they have a problem in that their manufacturing costs are higher than those of check valves used for other purposes. In addition, the check valve units described above need to be cleaned every time they are used, which is time-consuming. Therefore, there is a strong demand for an inexpensive system that can connect a water supply tube unit to the auxiliary water supply port of an endoscope without using a check valve unit.

[0006] The present invention has been invented to solve the problems described above, and aims to provide an inexpensive system that can connect a water supply tube unit to an auxiliary water supply port of an endoscope. [Means for solving the problem]

[0007] In one aspect of the present invention, a connector for an auxiliary water supply nozzle of an endoscope is a connector for an auxiliary water supply nozzle used when connecting a tube unit installed in a water supply device to the auxiliary water supply nozzle of the endoscope, and has a tubular connector body made of synthetic resin, the connector body having an insertion portion to be inserted into a storage space provided in the auxiliary water supply nozzle, a male threaded portion provided on the outer peripheral surface of the connector body and screwing into a female threaded portion provided in the storage space of the auxiliary water supply nozzle, and a step portion provided around the entire outer peripheral surface of the connector body between the insertion portion and the male threaded portion in the central axial direction of the connector body, the auxiliary water supply nozzle has a tapered surface between the storage space and the female threaded portion in the central axial direction of the auxiliary water supply nozzle, the step portion being characterized in that when the connector body is tightened and fixed to the auxiliary water supply nozzle, the ridge of the step portion provided around the entire outer peripheral surface of the connector body is held in a pressed state against the tapered surface.

[0008] The connector body also has a first flow path provided at one end side in the central axial direction of the connector body, into which liquid from the tube unit flows, and a second flow path provided at the other end side in the central axial direction of the connector body, for sending liquid flowing into the first flow path to the storage space, and it is preferable that the inner diameter of the second flow path is less than the inner diameter of the first flow path, and that the inner diameter of the first flow path is less than the inner diameter of the storage space.

[0009] In addition, it is preferable that the storage space has a water supply port at the bottom of the storage space that is continuous with the auxiliary water supply channel of the endoscope, the inner diameter of the water supply port being smaller than the inner diameter of the second flow path, and the outer diameter of the insertion portion being the same as the inner diameter of the storage space.

[0010] In addition, it is preferable that a check valve fixed to one end of the tube unit is connected to the other end of the connector body opposite the end connected to the auxiliary water supply nozzle, out of both end portions in the central axial direction of the connector body. Effect of the Invention

[0011] According to the present disclosure, it is possible to provide an inexpensive system capable of connecting a water supply tube unit to an auxiliary water supply port of an endoscope. [Brief description of the drawings]

[0012] [Figure 1] FIG. 1 is a schematic diagram showing one configuration of an endoscope system according to the present embodiment. [Diagram 2] FIG. 2 is a schematic diagram showing one configuration of a nozzle tip provided at an endoscope insertion portion. [Diagram 3] FIG. 3 is an exploded schematic diagram showing the configurations of an auxiliary water supply nozzle, a connector for the auxiliary water supply nozzle, and a check valve provided in a connection portion of an endoscope. [Figure 4] FIG. 4 is a schematic cross-sectional view showing the configuration of the auxiliary water supply nozzle. [Diagram 5] FIG. 5 is a schematic diagram showing a partial cross-section of the structure of a check valve. [Figure 6] FIG. 6 is a schematic cross-sectional view showing the configuration of the auxiliary water supply nozzle connector. [Figure 7] FIG. 7 is a schematic diagram showing a procedure for attaching a connector for an auxiliary water supply nozzle and a check valve to the auxiliary water supply nozzle provided on the connection part of the endoscope. [Figure 8] FIG. 8 is an enlarged schematic diagram of region A shown in FIG. [Figure 9] FIG. 9 is a diagram showing the measurement results of the amount of liquid delivered from the auxiliary water supply port 36 when the pump tube unit A attached to the water supply device 50A is connected to the endoscope 20. As shown in FIG. [Figure 10] FIG. 10 is a diagram showing the measurement results of the amount of liquid delivered from the auxiliary water supply port 36 when the pump tube unit B attached to the water supply device 50A is connected to the endoscope 20. As shown in FIG. [Figure 11] FIG. 11 is a diagram showing the measurement results of the amount of liquid delivered from the auxiliary water supply port 36 when the pump tube unit B attached to the water supply device 50B is connected to the endoscope 20. In FIG. [Figure 12]FIG. 12 is a diagram summarizing the presence or absence of liquid leakage and the pressure of the pumped liquid when the pump tube unit B attached to the water supply device 50B is connected to the endoscope 20. [Figure 13] FIG. 13 is a diagram summarizing the presence or absence of liquid leakage and the pressure of the pumped liquid when the pump tube unit A attached to the water supply device 50A is connected to the endoscope 20. [Figure 14] FIG. 14(a) is a diagram summarizing the pumping amount when the pump tube unit B attached to the water supply device 50B is connected to the endoscope 20, and FIG. 14(b) is a diagram summarizing the remaining water time. [Figure 15] FIG. 15(a) is a diagram summarizing the pumping amount when the pump tube unit C attached to the water-supply device 50B is connected to the endoscope 20, and FIG. 15(b) is a diagram summarizing the remaining water time. [Figure 16] FIG. 16(a) is a diagram summarizing the delivery amount when the pump tube unit B attached to the water delivery device 50A is connected to the endoscope 20, and FIG. 16(b) is a diagram summarizing the remaining water time. [Figure 17] FIG. 17(a) is a diagram summarizing the pumping amount when the pump tube unit C attached to the water supply device 50A is connected to the endoscope 20, and FIG. 14(b) is a diagram summarizing the remaining water time. [Figure 18] FIG. 18(a) is a diagram summarizing the pumping amount when the pump tube unit A attached to the water-pumping device 50A is connected to the endoscope 20, and FIG. 18(b) is a diagram summarizing the remaining water time. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0013] An endoscope system according to an embodiment of the present invention will now be described with reference to the drawings. As shown in Fig. 1, an endoscope system 10 includes an endoscope 20, a water supply device 50, a water supply tank 60, and a pump tube unit 70.

[0014] The endoscope 20 has an operating handle 21, an endoscope insertion section 22, a universal tube 23, and a connection section 24. The operating handle 21 has a plurality of operating sections 26, a forceps insertion section 27, etc. The plurality of operating sections 26 have, for example, angle knobs 26a and 26b as well as various buttons such as an air / water supply button 26c, a suction button 26d, and a shutter button 26e.

[0015] The angle knobs 26a and 26b are rotated when bending the bending portion 22a provided at the tip side of the endoscope insertion portion 22. The angle knob 26a is rotated when bending the bending portion 22a of the endoscope insertion portion 22, for example, in a direction perpendicular to the page in Fig. 1. The angle knob 26b is rotated when bending the bending portion 22a of the endoscope insertion portion 22, for example, in the left-right direction of the page in Fig. 1.

[0016] The air / water supply button 26c is operated when cleaning the observation port 31 and the illumination ports 32, 33 (see FIG. 2) provided on the tip surface 22b of the endoscope insertion section 22. The suction button 26d is operated when suctioning waste matter (including liquid used to clean a target site in the body cavity) from the forceps port 35 provided at the tip of the endoscope insertion section 22. The shutter button 26e is operated when capturing an image of the inside of the body cavity using an imaging device (not shown) provided inside the tip of the endoscope insertion section 22.

[0017] A treatment tool such as forceps is inserted into the forceps insertion portion 27. A forceps plug is attached to the forceps insertion portion 27 when the endoscope 20 is not in use.

[0018] Although detailed illustration is omitted, an air supply channel, a water supply channel, a light guide, a forceps channel, and an auxiliary water supply channel are provided inside the endoscope insertion portion 22. In the following description, the auxiliary water supply channel may be denoted by the symbol SC.

[0019] The light guide guides light emitted from a light source device (not shown) to which the connection portion 24 is connected, to illumination ports 32, 33 (see FIG. 2) provided at the tip of the endoscope insertion portion 22. The forceps channel guides a treatment tool such as forceps inserted from a forceps insertion portion 27 provided on the operation handle 21 to a forceps port 35 (see FIG. 2) provided at the tip of the endoscope insertion portion 22. The auxiliary water supply channel SC guides liquid such as physiological saline to an auxiliary water supply port 36 (see FIG. 2) provided at the tip of the endoscope insertion portion 22. The liquid such as physiological saline is supplied to the auxiliary water supply channel SC by driving the water supply device 50, and is discharged from the auxiliary water supply port 36 described above.

[0020] 2, the distal end surface 22b of the endoscope insertion portion 22 is provided with an observation port 31, illumination ports 32, 33, an air / water nozzle 34, a forceps port 35, an auxiliary water port 36, etc. Note that the configuration of the distal end surface 22b of the endoscope insertion portion 22 shown in Fig. 2 is merely one example, and the types and positions of the openings provided in the distal end surface 22b of the endoscope insertion portion 22 can be set appropriately.

[0021] The observation port 31 exposes an objective lens of an imaging device provided inside the tip of the endoscope insertion section 22. The objective lens captures an observation image of a target site in the body cavity into the imaging device. The illumination ports 32, 33 emit light guided by a light guide as illumination light toward the target site in the body cavity and the vicinity of the target site. The air / water supply nozzle 34 sprays air or liquid toward the observation port 31 and the illumination ports 32, 33 to clean the observation port 31, the illumination ports 32, 33 and their vicinity. The forceps port 35 moves a treatment tool such as forceps inserted from the forceps insertion section 27 in and out from the tip surface 22b. The auxiliary water supply port 36 sprays liquid to be supplied to the auxiliary water supply channel SC of the endoscope 20 via the pump tube unit 70 by the drive of the water supply device 50.

[0022] 1, the universal tube 23 connects the operating handle 21 and the connection part 24. Although not shown, the universal tube 23 is provided with an auxiliary water supply channel SC, a light guide, a suction channel, and the like inside.

[0023] The connection part 24 has a light source connection part 41 that enables connection to a light source device (not shown), an auxiliary water supply nozzle 42 that connects one end of the pump tube unit 70, and a suction nozzle 43. As shown in Fig. 3, a check valve 75 fixed to one end of the pump tube unit 70 is attached to the auxiliary water supply nozzle 42 via a connector 80 for the auxiliary water supply nozzle.

[0024] 4, the auxiliary water supply nozzle 42 is provided on the connection part 24 with a neck part 42a of the auxiliary water supply nozzle 42 protruding from the connection part 24. The auxiliary water supply nozzle 42 has a storage space 42b extending from the neck part 42a in the direction of the central axis (L1) of the auxiliary water supply nozzle 42.

[0025] The storage space 42b is provided with a female threaded portion 42c at an end portion on the neck portion 42a side in the direction of the central axis (L1). A male threaded portion 83 of a connector 80 for an auxiliary water supply nozzle, which will be described later, is screwed into the female threaded portion 42c. A tapered surface 42f is formed between an inner peripheral surface 42d of the storage space 42b and the female threaded portion 42c, and the tapered surface 42f is tapered toward a bottom portion 42e of the storage space 42b due to the difference in inner diameter between an inner diameter D1 of the storage space 42b and an inner diameter D2 (D2>D1) of the female threaded portion 42c. A water supply port 42g that is continuous with the auxiliary water supply channel SC is formed in the bottom portion 42e of the storage space 42b.

[0026] Returning to Fig. 1, the water supply device 50 is a device that supplies liquid stored in the water supply tank 60 toward the endoscope 20. Although not shown, the water supply device 50 has, for example, a plurality of rollers and a holding member that holds the rollers at a constant angular interval, and is a device that repeatedly performs an operation of drawing in new liquid while supplying liquid by rotating the holding member and squeezing the pump tube 71 with any of the plurality of rollers. The water supply device 50 is driven by, for example, pressing a foot switch (not shown). When the water supply device 50 is driven, the amount of liquid supplied to the endoscope 20 via the pump tube unit 70 is set to, for example, 240 ml / min.

[0027] The pump tube unit 70 has a pump tube 71, a filtered water supply tube 72, and a water supply tube 73, and is configured such that the filtered water supply tube 72 is connected to one end in the extension direction of the pump tube 71, and the water supply tube 73 is connected to the other end in the extension direction. The filtered water supply tube 72 is attached to the water supply tank 60 at its other end, which is opposite to the one end connected to the pump tube 71, in the extension direction of the filtered water supply tube 72. The water supply tube 73 is attached to the auxiliary water supply nozzle 42 of the endoscope 20 at its other end, which is opposite to the one end connected to the pump tube 71, in the extension direction of the water supply tube 73.

[0028] The above-mentioned pump tube 71 is attached to the water supply device 50 and is repeatedly operated when the water supply device 50 is operating, thereby drawing the liquid stored in the water supply tank 60 into the inside of the pump tube 71 via the filtered water supply tube 72, and at the same time, sending the liquid drawn into the inside of the pump tube 71 to the water supply tube 73.

[0029] Here, the inner and outer diameters of the pump tube 71 used in the pump tube unit 70 are, for example, 3.6 mm and 6.9 mm. The inner and outer diameters of the filtered water supply tube 72 and the water supply tube 73 are, for example, 3.4 mm and 6.0 mm.

[0030] The water supply tube 73 is provided with a check valve 75 at one end attached to the above-mentioned auxiliary water supply connector 42. The check valve 75, for example, allows liquid to flow from the pump tube unit 70 to the auxiliary water supply channel SC of the endoscope 20, while preventing liquid from flowing (backflowing) from the auxiliary water supply channel SC of the endoscope 20 to the pump tube unit 70.

[0031] 5, check valve 75 has a luer tip 76 and a luer lock portion 77 at one end in the direction of the central axis (L2) of check valve 75. When check valve 75 is attached to auxiliary water supply nozzle connector 80, luer tip 76 is inserted into internal space 84 provided in auxiliary water supply nozzle connector 80. Note that luer tip 76 is provided with a flow path 78 that extends in the direction of the central axis (L2) of check valve 75 and communicates with water supply tube 73.

[0032] The luer lock portion 77 has a female thread portion (not shown) on the inner circumferential surface of the luer lock portion 77. The female thread portion provided on the inner circumferential surface of the luer lock portion 77 screws into the male thread portion 82 of the auxiliary water supply nozzle connector 80 when the check valve 75 is tightened and fixed to the auxiliary water supply nozzle connector 80.

[0033] In this embodiment, the check valve 75 is fastened to the auxiliary water supply nozzle connector 80, but the check valve 75 and the auxiliary water supply nozzle connector 80 may be provided integrally.

[0034] The auxiliary water supply nozzle connector 80 has a connector body 80a manufactured by molding using a synthetic resin material such as polypropylene, nylon, fluororesin, ABS resin, polycarbonate, etc. Hereinafter, the auxiliary water supply nozzle connector 80 may be referred to as a connector.

[0035] As shown in Fig. 6, the connector body 80a has an insertion portion 81 at one end in the direction of the central axis (L3) of the connector body 80a and a male thread portion 82 at the other end. The insertion portion 81 is inserted into the storage space 37b of the auxiliary water supply nozzle 42 when the connector 80 is fastened to the auxiliary water supply nozzle 42. Therefore, the outer diameter D4 of the insertion portion 81 is set to be approximately the same diameter as the inner diameter D1 of the storage space 37b of the auxiliary water supply nozzle 42. As an example, the outer diameter D4 of the insertion portion 81 is 6.15 mm. The male thread portion 82 screws into a female thread portion (not shown) provided on the inner peripheral surface of the luer lock portion 77 of the check valve 75 when the check valve 75 is fastened to the connector 80.

[0036] Furthermore, a male thread portion 83 is provided on the outer peripheral surface of connector 80 in a predetermined range in approximately the center in the direction of the central axis (L3) of connector 80. The male thread portion 83 screws into a female thread portion 42c provided on the auxiliary water supply nozzle 42. When the check valve 75 is tightened and fixed to the connector 80, the outer peripheral surface 71a of the luer tip 71 is pressed against an inner peripheral surface 84f of a first flow path 84a of connector 80 (described later) (see FIG. 7(c)).

[0037] The connector 80 has a flow path 84 extending from one end 80b side to the other end 80c side in the direction of the central axis (L3) of the connector 80. The flow path 84 is a flow path that connects a first flow path 84a, a second flow path 84b, and a third flow path 84c from the one end 80b side to the other end 80c side in the direction of the central axis (L3) of the connector 80. Of these flow paths, the third flow path 84c is a tapered flow path that is reduced in diameter from the first flow path 84a to the second flow path 84b. The minimum and maximum values ​​of the inner diameter of the first flow path 84a are D5min and D5max, the inner diameter of the second flow path 84b is D6, and the minimum and maximum values ​​of the inner diameter of the third flow path 84c are D7min and D7max. At this time, the minimum value D7min of the inner diameter of the third flow passage 84c is equal to the inner diameter D6 of the second flow passage 84b, and the maximum value D7max of the inner diameter of the third flow passage 84c is equal to the minimum value D5min of the inner diameter of the first flow passage 84a. The inner diameter D6 of the second flow passage 84b is smaller than the inner diameter D1 of the storage space 42b of the auxiliary water supply nozzle 42 and larger than the inner diameter D3 of the water supply port 42g provided at the bottom 42e of the storage space 42b.

[0038] Here, the minimum value D5min and the maximum value D5max of the inner diameter of the first flow passage 84a are, for example, D5min=3.75 mm and D5max=4.33 mm. The inner diameter D6 of the second flow passage 84b is, for example, D6=1.5 mm. Furthermore, the minimum value D7min and the maximum value D7max of the inner diameter of the third flow passage 84c are, for example, D7min=1.5 mm and D7max=3.75 mm.

[0039] The flow path 84 of the connector 80 is a flow path that connects a first flow path 84a, a second flow path 84b, and a third flow path 84c from one end 80b side toward the other end 80c side in the direction of the central axis (L3) of the connector 80. However, the flow path 84 of the connector 80 may be a flow path that combines the first flow path 84a that extends from one end 80b side toward the other end 80c side in the direction of the central axis (L3) of the connector 80 and the second flow path 84b that extends from the other end 80c side toward the one end 80b side in the direction of the central axis (L3) of the connector 80.

[0040] In the above-described connector 80, a step 87 resulting from the difference in outer diameter from the insertion portion 81 is provided around the entire circumference near the end of the male thread portion 83 on the insertion portion 81 side. When the connector 80 is connected to the auxiliary water supply nozzle 42, the ridge C1 (see FIG. 8) of the step 87 is pressed against the tapered surface 42f provided on the auxiliary water supply nozzle 42.

[0041] Next, a procedure for attaching the check valve 75 to the auxiliary water supply nozzle 42 of the endoscope 20 using the auxiliary water supply nozzle connector 80 in this embodiment will be described with reference to FIG.

[0042] 7(a), first, the insertion portion 81 of the connector 80 is inserted into the storage space 42b provided in the auxiliary water supply nozzle 42. In this state, the connector 80 is rotated, for example, in the R1 direction around the central axis (L3) of the connector 80. By rotating the connector 80 in the R1 direction, the male threaded portion 83 of the connector 80 is screwed into the female threaded portion 42c of the auxiliary water supply nozzle 42, and the connector 80 is tightened and fixed to the auxiliary water supply nozzle 42.

[0043] During the process of tightening and fixing the connector 80 to the auxiliary water supply nozzle 42, the ridge C1 of the step portion 87 on the outer peripheral surface of the connector 80 is pressed against the tapered surface 42f provided between the inner peripheral surface 42d of the storage space 42b provided in the auxiliary water supply nozzle 42 and the female thread portion 42c (see Figure 8).

[0044] The auxiliary water supply nozzle 42 is made of a metal material such as stainless steel, while the connector 80 is made of a synthetic resin material. Therefore, when the step portion 87 is pressed against the tapered surface 42f of the auxiliary water supply nozzle 42 during the process of fastening and fixing the connector 80 to the auxiliary water supply nozzle 42, the ridge line C1 of the step portion 87 is pressed against the tapered surface 42f of the auxiliary water supply nozzle 42 while being deformed (crushed) due to the difference in hardness between the auxiliary water supply nozzle 42 and the connector 80.

[0045] Next, the pump tube unit 70 is attached to the endoscope 20. The check valve 75 fixed to the water supply tube 73 of the pump tube unit 70 is connected to the connector 80 connected and fixed to the auxiliary water supply nozzle 42. First, the luer tip 76 of the check valve 75 is inserted into the first flow path 84a of the connector 80. As shown in FIG. 7(b), the check valve 75 is rotated, for example, in the R2 direction around the central axis (L2) direction of the check valve 75 as the rotation center. By rotating the check valve 75 in the R2 direction, the male thread portion 82 of the connector 80 is screwed into the female thread portion of the luer lock portion 72 of the check valve 75, and the check valve 75 is tightened and fixed to the connector 80. As shown in FIG. 7(c), when the check valve 75 is tightened and fixed to the connector 80, the outer peripheral surface 76a of the luer tip 76 is pressed against the inner peripheral surface 84f of the first flow path 84a of the connector 80.

[0046] Although the check valve 75 fixed to the water supply tube 73 is fastened to the connector 80 after the connector 80 is fastened to the auxiliary water supply nozzle 42, it is also possible to fasten the check valve 75 attached to one end of the water supply tube 73 to the connector 80, and then fasten the connector 80 to the auxiliary water supply nozzle 42. Alternatively, the check valve 75 and the connector 80 may be connected and fixed in advance.

[0047] When the water supply device 50 is driven during an examination or surgery using the endoscope 20, the liquid drawn into the pump tube 71 of the pump tube unit 70 is sent to the water supply tube 73, while the liquid stored in the water supply tank 60 is drawn into the pump tube 71 via the filtered water supply tube 72. When the water supply device 50 is driven, the liquid drawn into the pump tube 71 is repeatedly sent to the water supply tube 73, and the liquid stored in the water supply tank 60 is repeatedly drawn into the pump tube 71. As a result, the liquid stored in the water supply tank 60 is intermittently sent from the pump tube 71 to the water supply tube 73.

[0048] As described above, when the water supply device 50 is driven, the amount of liquid supplied through the pump tube unit 70 is 240 ml. At this time, the pressure of the liquid supplied from the pump tube 71 to the water supply tube 73 is, for example, 0.45 MPa.

[0049] The liquid delivered from the pump tube 71 to the water supply tube 73 flows from a flow path 78 provided at the luer tip 76 of the check valve 75 to a first flow path 84a of the connector 80. The liquid that has flowed into the first flow path 84a of the connector 80 flows from the first flow path 84a to the third flow path 84c and then to the second flow path 84b.

[0050] As described above, when the check valve 75 is fastened to the connector 80, the outer circumferential surface 76a of the luer tip 76 of the check valve 75 is held in a state of being pressed against the inner circumferential surface 84f of the first flow path 84a of the connector 80. Therefore, liquid that has flowed from the flow path 78 provided in the luer tip 76 of the check valve 75 into the first flow path 84a of the connector 80 does not leak between the outer circumferential surface 76a of the luer tip 76 of the check valve 75 and the inner circumferential surface 84f of the first flow path 84a of the connector 80, but flows from the check valve to the flow path 84 of the connector 80.

[0051] The liquid flowing through the flow path 84 of the connector 80 flows from the second flow path 84b toward the storage space 42b of the auxiliary water supply nozzle 42. At this time, the speed of the liquid flowing from the first flow path 84a to the second flow path 84b is accelerated by passing through the third flow path 84c. Then, when the liquid flows from the second flow path 84b into the storage space 42b of the auxiliary water supply nozzle 42, the speed of the liquid is decelerated. In other words, the second flow path 84b of the connector 80 functions as an orifice. The liquid that flows from the second flow path 84b of the connector 80 into the storage space 42b of the auxiliary water supply nozzle 42 is retained inside the storage space 42b, and after the inside of the storage space 42b is filled with liquid, it flows from the water supply port 42g toward the auxiliary water supply channel SC.

[0052] As described above, the water supply port 42g connected to the auxiliary water supply channel SC is provided at the bottom 42e of the storage space 42b provided in the auxiliary water supply nozzle 42. The inner diameter D3 of the water supply port 42g is smaller than the inner diameter D6 of the second flow path 84b of the connector 80. Therefore, the liquid remaining in the storage space 42b of the auxiliary water supply nozzle 42 is pressed by the liquid newly sent to the storage space 42b, and is sent from the water supply port 42g provided at the bottom 42e of the storage space 42b to the auxiliary water supply channel SC.

[0053] Here, when the insertion portion 81 of the connector 80 is fastened and fixed to the auxiliary water supply nozzle 42, the outer peripheral surface 81a of the insertion portion 81 of the connector 80 and the inner peripheral surface of the storage space 42b of the auxiliary water supply nozzle 42 are in contact with each other. Also, the ridge line C1 of the step portion 87 of the connector 80 and the area nearby it are pressed against the tapered surface 42f of the auxiliary water supply nozzle 42 and are held in a deformed state. That is, the area nearby the ridge line C1 of the step portion 87 of the connector 80 functions as a seal material pressed against the tapered surface 42f of the auxiliary water supply nozzle 42. Also, the outer peripheral surface of the insertion portion 81 of the connector 80 and the inner peripheral surface of the storage space 42b of the auxiliary water supply nozzle 42 are in contact with each other, thereby preventing liquid from flowing between them. As a result, even if the pressure of the liquid remaining in the storage space 42b increases after the storage space 42b is filled with liquid and new liquid is sent from the connector 80 to the storage space 42b, leakage between the connector 80 and the auxiliary water supply nozzle 42 is prevented.

[0054] When the examination or surgery using the endoscope 20 is completed, the connector 80 is removed from the auxiliary water supply nozzle 42 and discarded together with the check valve 75 and the pump tube unit 70 to which the check valve 75 is connected.

[0055] This makes it possible to use the connector 80 to connect a check valve used for other purposes to the endoscope 20. In addition, the connector 80 can function as a disposable product that can be discarded together with the pump tube unit 70 after use.

[0056] Finally, the results of the following tests (1) to (4) will be explained. (1) Check for leakage from connections (2) Measuring the pressure of the liquid sent out from the sub-water supply outlet (3) Amount of liquid discharged from the auxiliary water supply port of the endoscope (4) Measurement of remaining water time Test (4) was conducted simultaneously with test (3).

[0057] Hereinafter, the amount of liquid delivered from the auxiliary water supply port 36 of the endoscope 20 will be referred to as the delivery amount. Also, the amount of liquid delivered to the endoscope 20 by driving the water supply device 50 will be referred to as the water supply volume. Here, the remaining water time in test (4) is the time from when the water supply device 50 is stopped to when the delivery of liquid from the auxiliary water supply port 36 of the endoscope 20 stops. Therefore, the longer the remaining water time, the worse the water drainage.

[0058] The above-mentioned test was performed using two different types of water conveying devices 50. Hereinafter, one of the two types of water conveying devices 50 will be referred to as water conveying device 50A, and the other as water conveying device 50B. Each of the water conveying devices 50A and 50B can adjust the amount of water actually conveyed by, for example, changing (adjusting) the setting level of the water conveying amount provided in the device itself. Note that the water conveying devices 50A and 50B convey the maximum amount of water when the setting level is set to LEVEL 9, and the minimum amount of water when the setting level is set to LEVEL 1.

[0059] <Selection of setting level for water supply device> First, in conducting the above-mentioned tests (1) to (4), the setting levels of the water conveying amounts set in the water conveying devices 50A and 50B were selected (decided). In selecting the setting levels, the following two different types of pump tube units were used. Pump tube unit A: A pump tube unit exclusively for the water conveying device 50A having a pump tube with an inner diameter of 6.5 mm and an outer diameter of 9.6 mm Pump tube unit B: A pump tube unit having a pump tube with an inner diameter of 3.6 mm and an outer diameter of 6.9 mm (pump tube unit 70 shown in this embodiment)

[0060] As described above, the pump tube unit A is a dedicated pump tube unit for connecting to the auxiliary water supply nozzle 42 of the endoscope 20 while attached to the water supply device A. Although not shown, a dedicated check valve is fixed to the auxiliary water supply nozzle 42 of the endoscope 20. In addition, a connection nozzle fixed to one end of the pump tube unit A is connected and fixed to the dedicated check valve.

[0061] Moreover, the pump tube unit B is the pump tube unit 70 shown in this embodiment. The pump tube unit B is connected and fixed to the endoscope 20 by connecting and fixing the check valve 75 fixed to one end of the pump tube unit B to the auxiliary water supply nozzle 42 of the endoscope 20 via the connector 80 described in this embodiment.

[0062] First, the pump tube unit A attached to the water supply device 50A was connected to the endoscope 20, and the amount of water sent out from the auxiliary water supply port 42 of the endoscope 20 was measured when the water supply device 50A was driven. Figures 9(a), 9(b), and 9(c) show the results of measuring the amount of water sent out from the auxiliary water supply port 36 of the endoscope 20 (hereinafter referred to as measurement results 1-a, 1-b, and 1-c). Note that, in the pump tube unit A attached to the water supply device A, since the amount of water sent varies with the drive of the water supply device 50A, the amount of water sent out was measured three times at the same setting level. Note that the amount of water sent out from the auxiliary water supply port 36 of the endoscope 20 was measured every 20 seconds, and the amount of water sent out every 60 seconds was calculated from the average of the measured amounts of water sent out.

[0063] Next, the pump tube unit B attached to the water supply device 50A was connected to the endoscope 20, and the amount of water sent out from the auxiliary water supply port 36 of the endoscope 20 was measured when the water supply device 50A was driven. Fig. 10 shows a summary of the results of measuring the amount of water sent out from the auxiliary water supply port 36 of the endoscope 20 (hereinafter referred to as measurement result 2). In this case as well, the amount of water sent out from the auxiliary water supply port 36 of the endoscope 20 was measured every 20 seconds, and the amount sent out every 60 seconds was calculated from the average of the measured amounts of water sent out.

[0064] Finally, the pump tube unit B attached to the water supply device 50B was connected to the endoscope 20, and the amount of water sent out from the auxiliary water supply port 36 of the endoscope 20 was measured when the water supply device 50B was driven. Fig. 11 shows a summary of the results of measuring the amount of water sent out from the auxiliary water supply port 36 of the endoscope 20 (hereinafter referred to as measurement result 3). The amount of water sent out from the auxiliary water supply port 36 of the endoscope 20 was measured every 30 seconds, and the amount sent out every 60 seconds was calculated from the average of the measured amounts of water sent out.

[0065] 9 and 10, it was found that the liquid delivery rate from the auxiliary water supply port 36 when the pump tube unit A is attached to the water supply device 50A is the same as the liquid delivery rate from the auxiliary water supply port 36 of the endoscope 20 when the pump tube unit B is attached to the water supply device 50A at approximately 240 ml / min and approximately 190 ml / min. It was found that in order to set the setting level of the water supply device 50A so as to achieve the above delivery rate when the pump tube unit A is used, it is preferable to set the setting level of the water supply device 50A to LEVEL 9 or LEVEL 5. At the same time, it was found that in order to set the setting level of the water supply device 50A so as to achieve the above delivery rate when the pump tube unit B is used, it is preferable to set the setting level of the water supply device 50A to LEVEL 9 or LEVEL 7.

[0066] The verification condition is that the liquid is fed out from the auxiliary water supply port 36 of the endoscope 20 at the same feed rate. Therefore, when the pump tube unit B is attached to the water supply device 50B and used, it is preferable to adjust the setting level of the water supply device 50B so that the same feed rate is obtained as when the pump tube unit B is attached to the water supply device 50A and used. As shown in Fig. 11, it was found that the setting level of the water supply device 50B is preferably set to LEVEL 9 and LEVEL 6 in order to set the setting level of the water supply device 50B so that the liquid is fed out from the auxiliary water supply port 36 of the endoscope 20 at approximately 240 ml / min and approximately 190 ml / min.

[0067] <Test 1: Verification of leakage from connection parts> Next, a verification test was conducted for liquid leakage at the connection between the pump tube unit and the endoscope 20. First, a verification test was conducted for liquid leakage when the pump tube unit B attached to the water supply device 50B was connected to the auxiliary water supply port 42 of the endoscope 20. The verification for liquid leakage was conducted with the setting level of the water supply device 50B set to LEVEL 9. The amount of water sent out from the auxiliary water supply port 36 of the endoscope 20 was measured every 30 seconds, and the amount sent out every 60 seconds was calculated from the average of the measured amounts of water sent out.

[0068] 12, the amount of liquid sent from the auxiliary water supply port 36 of the endoscope 20 was 231.0 ml / min. At this time, a check was carried out for liquid leakage, and no liquid leakage was found at the connection between the pump tube unit B and the endoscope 20, i.e., the connection between the connector 80 and the check valve 75, and the connection between the connector 80 and the auxiliary water supply port 42.

[0069] As a comparative test, a test was conducted to check for liquid leakage when the pump tube unit A attached to the water supply device 50A was connected to the auxiliary water supply connector 42 of the endoscope 20. In this case, as shown in Fig. 13, even when the pump tube unit A attached to the water supply device 50A was connected to the auxiliary water supply connector 42 of the endoscope 20, no liquid leakage occurred at the connection between the pump tube unit A and the endoscope 20.

[0070] In other words, when the connector 80 in this embodiment is used to connect the pump tube unit B attached to the water supply device 50B to the auxiliary water supply nozzle 42 of the endoscope 20, the results showed that no liquid leakage occurred, just as in the case where the pump tube unit A attached to the water supply device 50A is connected to the auxiliary water supply nozzle 42 of the endoscope 20.

[0071] <Test 2: Measurement of the pressure of the liquid sent out from the sub-water supply port> When checking for liquid leakage, a measurement test was performed on the pressure of the liquid sent out from the auxiliary water supply port 36. As shown in Fig. 12, when the pump tube unit B attached to the water supply device 50B was connected to the auxiliary water supply connector 42 of the endoscope 20, the pressure of the liquid sent out from the auxiliary water supply port 36 of the endoscope 20 was 0.45 MPa all five times.

[0072] The pressure of the liquid was also measured when the pump tube unit A attached to the water supply device 50A was connected to the auxiliary water supply nozzle 42 of the endoscope 20. As shown in Fig. 13, when the pump tube unit A attached to the water supply device 50A was connected to the auxiliary water supply nozzle 42 of the endoscope 20, the pressure of the liquid delivered from the auxiliary water supply port 36 was 0.45 MPa all five times.

[0073] In other words, when the connector 80 in this embodiment is used to connect the pump tube unit B attached to the water supply device 50B to the auxiliary water supply nozzle 42 of the endoscope 20, it was found to have the same performance as when the pump tube unit A attached to the water supply device 50A is connected to the auxiliary water supply nozzle 42 of the endoscope 20.

[0074] <Test 3: Measurement of the amount of liquid discharged from the auxiliary water supply port of the endoscope and Test 4: Measurement of remaining water time> The amount of liquid discharged from the auxiliary water supply port 36 of the endoscope 20 and the remaining water time were measured. In measuring the amount of liquid discharged from the auxiliary water supply port 36 of the endoscope 20 and the remaining water time, in addition to the above-mentioned pump tube units A and B, the following pump tube unit C was used. Pump tube unit C: A pump tube unit with an inner diameter of 6.6 mm and an outer diameter of 9.7 mm.

[0075] The pump tube unit C is a pump tube unit having a pump tube with an inner diameter and an outer diameter different from those of the pump tube unit B. Like the pump tube unit B, the pump tube unit C is connected to the endoscope 20 by screwing and fixing the check valve 75 fixed to one end of the pump tube unit C to the auxiliary water supply nozzle 42 of the endoscope 20 via the connector 80 described in this embodiment.

[0076] First, measurements were taken when the pump tube unit B attached to the water supply device 50B was connected to the endoscope 20. As shown in Fig. 14(a), the average delivery rate was 241.6 ml / min when the water supply device 50B was set to LEVEL 9. The average delivery rate was 188.8 ml / min when the water supply device 50B was set to LEVEL 6. During the measurement of the delivery rate, no liquid leakage occurred at the connection between the pump tube unit B and the endoscope 20.

[0077] 14(b), the average remaining water time was 0.674 s when the setting level of the water conveying device 50B was set to LEVEL 9. The average remaining water time was 0.0 s when the setting level of the water conveying device 50B was set to LEVEL 6.

[0078] Next, a pump tube unit C having a pump tube 71 with an inner diameter of 6.6 mm and an outer diameter of 9.7 mm was attached to the water supply device 50B, and measurements were taken when the water supply device 50B was connected to the endoscope 20. As shown in FIG. 15(a), the average delivery rate was 112.4 ml / min when the water supply device 50B was set to LEVEL 9. The average delivery rate was 221.4 ml / min when the water supply device 50B was set to LEVEL 6. During the measurement of the delivery rate, no liquid leakage occurred at the connection between the pump tube unit C and the endoscope 20.

[0079] 15(b), the average remaining water time was 2.76 seconds when the setting level of the water conveying device 50B was set to LEVEL 9. The average remaining water time was 3.52 seconds when the setting level of the water conveying device 50B was set to LEVEL 6.

[0080] Next, measurements were taken when the pump tube unit B was attached to the water supply device 50A and connected to the endoscope 20. As shown in Fig. 16(a), the average delivery rate was 245.4 ml / min when the water supply device 50A was set to LEVEL 9. The average delivery rate was 195.0 ml / min when the water supply device 50A was set to LEVEL 7. During the measurement of the delivery rate, no liquid leakage occurred at the connection between the pump tube unit B and the endoscope 20.

[0081] 16(b), the average remaining water time was 0.57 seconds when the setting level of the water conveying device 50A was set to LEVEL 9. The average remaining water time was 0.54 seconds when the setting level of the water conveying device 50A was set to LEVEL 7.

[0082] Next, measurements were taken when the pump tube unit C was attached to the water supply device 50A and connected to the endoscope 20. As shown in Fig. 17(a), the average delivery rate was 206.4 ml / min when the water supply device 50A was set to LEVEL 9. The average delivery rate was 179.4 ml / min when the water supply device 50A was set to LEVEL 7. During the measurement of the delivery rate, no liquid leakage occurred at the connection between the pump tube unit C and the endoscope 20.

[0083] 17(b), the average remaining water time was 4.18 seconds when the setting level of the water conveying device 50A was set to LEVEL 9. The average remaining water time was 3.59 seconds when the setting level of the water conveying device 50A was set to LEVEL 7.

[0084] Finally, measurements were taken when the pump tube unit A was attached to the water supply device 50A and connected to the endoscope 20. As shown in Fig. 18(a), the average delivery rate was 243.6 ml / min when the water supply device 50A was set to LEVEL 9. The average delivery rate was 208.2 ml / min when the water supply device 50A was set to LEVEL 5. During the measurement of the delivery rate, no liquid leakage occurred at the connection between the pump tube unit A and the endoscope 20.

[0085] 18(b), the average remaining water time was 1.95 seconds when the setting level of the water conveying device 50A was set to LEVEL 9. The average remaining water time was 1.79 seconds when the setting level of the water conveying device 50A was set to LEVEL 5.

[0086] According to the measurement results of the water supply amount, it was found that when the pump tube unit B was attached to the water supply device 50B and connected to the endoscope 20, the supply amount was more targeted than when the pump tube unit A was attached to the water supply device 50A and connected to the endoscope 20. It was also found that the remaining water time was shorter when the pump tube unit B was attached to the water supply device 50B and connected to the endoscope 20 than when the pump tube unit A was attached to the water supply device 50A and connected to the endoscope 20.

[0087] It was found that when the pump tube unit C was attached to either the water conveying device 50A or the water conveying device 50B and the set level was set to LEVEL 9, an event occurred in which the pump tube could not be handled properly when the water conveying device was driven, and water could not be conveyed at the desired amount. On the other hand, when the set level was set to less than LEVEL 9, the amount of water conveyed was close to the desired amount, so when using the pump tube unit C, it is preferable to use the set level at less than LEVEL 9.

[0088] That is, by carrying out tests (1) to (4), it was found that when the pump tube unit B was attached to the water supply device 50B or 50A and connected to the endoscope 20, the pump tube unit had performance equal to or better than that when the pump tube unit A was attached to the water supply device 50A and connected to the endoscope 20. It was also found that, in this case, by connecting the pump tube unit B to the auxiliary water supply nozzle 42 of the endoscope 20 via a connector, it is possible to prevent the occurrence of liquid leakage and improve water drainage. In this way, by connecting the pump tube unit 70, which is not dedicated to the water supply device 50, to the endoscope 20 via the connector 80, it is possible to obtain performance similar to that when the pump tube unit and the endoscope are connected using dedicated parts.

[0089] <Summary of effects> The connector 80 for the auxiliary water supply nozzle of the present invention is used when connecting the tube unit 70 installed in the water supply device 50 to the auxiliary water supply nozzle 42 of the endoscope 20, and has a cylindrical connector body 80a made of synthetic resin. The connector body 80a has an insertion portion 81 to be inserted into the storage space 42b provided in the auxiliary water supply nozzle 42, a male screw portion 83 provided on the outer circumferential surface of the connector body 80a and screwed into the female screw portion 42c provided in the storage space 42b of the auxiliary water supply nozzle 42, and The auxiliary water supply nozzle 42 has a tapered surface 42f between the storage space 42b and the female threaded portion 42c in the central axial direction of the auxiliary water supply nozzle 42, which has a diameter narrowing from the female threaded portion 42c toward the storage space 42b, and the step portion 87 is held in a pressed state against the tapered surface 42f when the connector body 80a is tightened and fixed to the auxiliary water supply nozzle 42.

[0090] According to this, when the water supply device 50 is driven, liquid supplied by the water supply tank 60 installed on the water supply device 50 can be reliably sprayed out from the auxiliary water supply port 36 via the auxiliary water supply channel SC of the endoscope 20 without leakage between the auxiliary water supply nozzle connector 80 and the auxiliary water supply nozzle 42 of the endoscope 20.

[0091] In addition, the connector body 80a has a first flow path 84a provided at one end side in the central axial direction of the connector body 80a, into which liquid from the pump tube unit 70 flows, and a second flow path 84b provided at the other end side in the central axial direction of the connector body 80a, for sending liquid flowing into the first flow path 84a to the storage space 42b, and it is preferable that the inner diameter of the second flow path 84b is less than the inner diameter of the first flow path 84a, and that the inner diameter of the first flow path 84a is less than the inner diameter of the storage space 42b.

[0092] According to this, the second flow path 84b functions as an orifice, and allows the liquid to flow into the storage space 42b of the auxiliary water supply nozzle 42. At this time, the pressure of the liquid that has flowed into the storage space 42b of the auxiliary water supply nozzle 42 decreases, preventing excessive pressure load from being applied to the step portion 87 that is in pressure contact with the tapered surface 42f. As a result, at the location where the step portion 87 is in pressure contact with the tapered surface 42f, the liquid can be reliably sent to the auxiliary water supply channel SC of the endoscope 20 without leaking.

[0093] In addition, the storage space 42b has a water supply port 42g at the bottom 42e of the storage space 42b that is continuous with the auxiliary water supply channel of the endoscope, and it is preferable that the inner diameter D3 of the water supply port 42g is smaller than the inner diameter D6 of the second flow path 84b and the outer diameter D4 of the insertion portion 81 is the same as the inner diameter D1 of the storage space 42b.

[0094] According to this configuration, the liquid delivered by the pump tube unit 70 accumulates in the storage space 42b of the auxiliary water supply nozzle 42 via the connector, and is then pressed by new liquid delivered to the storage space 42b of the auxiliary water supply nozzle 42, and is delivered from the water supply port 42g to the auxiliary water supply channel SC. At this time, the liquid retained in the storage space 42b of the auxiliary water supply nozzle 42 does not reach the area where the step portion 87 is pressed against the tapered surface 42f, because the insertion portion 81 of the connector 80 and the storage space 42b of the auxiliary water supply nozzle 42 are abutted against each other. This makes it possible to prevent water leakage between the auxiliary water supply nozzle connector 80 and the auxiliary water supply nozzle 42 of the endoscope 20.

[0095] In addition, it is preferable that a check valve 75 fixed to one end of the pump tube unit 70 is connected to the other end of the connector body 80a opposite the end connected to the auxiliary water supply nozzle 42, out of both ends in the central axial direction of the connector body 80a.

[0096] According to this, after use of the endoscope 20, the connector 80 is discarded together with the pump tube unit 70, and only the endoscope 20 is washed. Therefore, instead of using a check valve (or a check valve unit) dedicated to the endoscope, it becomes possible to use an inexpensive and disposable check valve used for other purposes. [Explanation of symbols]

[0097] 10 Endoscope System 20 Endoscopy 42 Sub-water supply nozzle 42f Tapered surface 50 Water supply equipment 60 Water tank 70 Pump tube unit 75 Check valve 80 Sub-water supply connector 81 Insertion section 83 Male thread 84 Flow Path 84a First flow path 84b Second flow path 84c 3rd Stream 87 Step

Claims

1. A connector for an auxiliary water supply nozzle used when connecting a tube unit installed in a water supply device to an auxiliary water supply nozzle of an endoscope, The connector body has a cylindrical shape and is made of synthetic resin. The connector body includes: an insertion portion that is inserted into a storage space provided in the auxiliary water supply nozzle; a male thread portion provided on an outer circumferential surface of the connector body and adapted to be screwed into a female thread portion provided in the storage space of the auxiliary water supply nozzle; a step portion provided around an entire outer circumferential surface of the connector body between the insertion portion and the male screw portion in a central axis direction of the connector body; having The auxiliary water supply nozzle is a tapered surface having a diameter reduced from the female thread portion toward the storage space in the central axis direction of the auxiliary water supply nozzle between the storage space and the female thread portion, When the connector body is fastened to the auxiliary water supply nozzle, the step portion is held in a state in which a ridge line of the step portion provided around the entire outer periphery of the connector body is pressed against the tapered surface. A connector for an auxiliary water supply nozzle of an endoscope.

2. 2. The connector for an auxiliary water supply nozzle of an endoscope according to claim 1, The connector body includes: a first flow path provided at one end side in a central axis direction of the connector body, into which liquid from the tube unit flows; a second flow path provided on the other end side in the central axis direction of the connector body, for sending the liquid flowing into the first flow path to the storage space; having an inner diameter of the second flow path is less than an inner diameter of the first flow path; The inner diameter of the first flow passage is less than the inner diameter of the storage space. A connector for an auxiliary water supply nozzle of an endoscope.

3. 3. The connector for an auxiliary water supply nozzle of an endoscope according to claim 2, The storage space has a water supply port at a bottom portion thereof, the water supply port being continuous with the auxiliary water supply channel of the endoscope, The inner diameter of the water supply port is smaller than the inner diameter of the second flow path, The outer diameter of the insertion portion is the same as the inner diameter of the storage space. A connector for an auxiliary water supply nozzle of an endoscope.

4. 4. The connector for an auxiliary water supply nozzle of an endoscope according to claim 3, The connector body has two ends in a central axis direction, and a check valve fixed to one end of the tube unit is connected to the other end opposite the one end connected to the auxiliary water supply nozzle. A connector for an auxiliary water supply nozzle of an endoscope.

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