Catheter set

Abstract

A catheter set according to the present disclosure comprises: a balloon catheter provided with a balloon; and an adapter that has internally defined therein an insertion hole allowing the balloon catheter to be inserted therethrough, and that is connectable to an endoscope in a state in which the insertion hole is in communication with a forceps channel of the endoscope. The insertion hole of the adapter is capable of accommodating at least a portion of the balloon of the balloon catheter that is removed from the forceps channel of the endoscope.

Description

Catheter set

[0001] The present disclosure relates to a catheter set.

[0002] Conventionally, as a technique for treating lesions such as cancer that occur in luminal organs such as the esophagus, stomach, and large intestine, endoscopic treatment using an endoscope is known. In endoscopic treatment, for example, an endoscope and a treatment instrument may be inserted into the luminal organ, and the lesion may be treated using the treatment instrument while observing the lesion with the endoscope.

[0003] The endoscope defines a forceps channel through which the treatment instrument can be inserted. The proximal end of the forceps channel is disposed outside the subject's body. The distal end of the forceps channel is disposed inside the subject's luminal organ. The treatment instrument is inserted into the luminal organ from outside the subject's body through the forceps channel of the endoscope.

[0004] Patent Document 1 discloses a cover for preventing a treatment instrument contaminated with the subject's biological material from being exposed when the treatment instrument is removed from the forceps channel of the endoscope to the outside of the subject's body.

[0005] Japanese Patent Translation of PCT International Publication No. 2009-527259

[0006] When a balloon catheter is used as the treatment instrument, the balloon of the balloon catheter may be temporarily removed from the forceps channel and then reinserted into the forceps channel. In this case, it is desirable that the balloon in the state of being temporarily removed from the forceps channel be protected from contamination from the surroundings in order to reduce the infection risk.

[0007] An object of the present disclosure is to provide a catheter set that can protect the periphery of the balloon of a balloon catheter in a state of being temporarily removed from the forceps channel of an endoscope.

[0008] A catheter set in a first aspect of the present disclosure is a catheter set comprising: (1) a balloon catheter having a balloon; and an adapter having an insertion hole through which the balloon catheter can be inserted, and which can be connected to an endoscope such that the insertion hole communicates with a forceps channel of the endoscope, wherein the insertion hole of the adapter is capable of accommodating at least a portion of the balloon of the balloon catheter when it is withdrawn from the forceps channel of the endoscope.

[0009] A catheter set as one embodiment of the present disclosure is the catheter set according to (1) above, wherein the insertion hole of the adapter is capable of accommodating the entire balloon in the longitudinal direction of the balloon catheter.

[0010] A catheter set as one embodiment of the present disclosure is the catheter set according to (1) or (2) above, wherein the balloon catheter comprises a shaft that holds the balloon, and the adapter comprises an adapter body that partitions the insertion hole, and a gripping member fixed to the adapter body that can change shape between a gripping form that grips the shaft inserted through the insertion hole and a release form that does not grip the shaft.

[0011] One embodiment of the present disclosure is a catheter set as described in (3) above, wherein the gripping member is fixed to the proximal side of the insertion hole.

[0012] A catheter set as one embodiment of the present disclosure is the catheter set according to (3) or (4) above, wherein the adapter body is made of a transparent material.

[0013] A catheter set as one embodiment of the present disclosure is the catheter set according to any one of (3) to (5) above, wherein the adapter body is made of a rigid material that does not have flexibility.

[0014] A catheter set as one embodiment of the present disclosure is the catheter set according to any one of (3) to (5) above, wherein the adapter body is made of a flexible soft material.

[0015] A catheter set as one embodiment of the present disclosure is the catheter set according to any one of (3) to (7) above, wherein the adapter body comprises a plurality of wing portions that protrude in a direction perpendicular to the insertion direction in which the balloon catheter is inserted into the insertion hole.

[0016] A catheter set as one embodiment of the present disclosure is the catheter set according to any one of (1) to (8) above, wherein the adapter comprises a connecting member connectable to a forceps port of the endoscope that demarcates the proximal end of the forceps channel, and the connecting member comprises a movement restricting portion that, by engaging with the forceps port, restricts the connecting member from moving away from the forceps port of the endoscope in the insertion direction in which the balloon catheter is inserted into the insertion hole.

[0017] A catheter set as one embodiment of the present disclosure is the catheter set according to (9) above, wherein the movement restricting portion is an engaging portion which is covered in the separating direction by the flange portion of the forceps port and abuts against the flange portion, thereby restricting the movement of the connecting member in the separating direction.

[0018] A catheter set as one embodiment of the present disclosure is the catheter set according to (9) or (10) above, wherein the connecting member is provided with a rotation restricting portion that engages with the forceps port to restrict the connecting member from rotating relative to the forceps port.

[0019] A catheter set as one embodiment of the present disclosure is the catheter set according to (11) above, wherein the rotation restricting portion comprises a stopper wall portion that abuts against the side surface of the forceps port, thereby restricting the connecting member from rotating relative to the forceps port.

[0020] A catheter set as one embodiment of the present disclosure is the catheter set according to any one of (1) to (12) above, wherein the minimum diameter of the insertion hole of the adapter is smaller than the maximum diameter of the balloon in the expanded state.

[0021] According to this disclosure, a catheter set capable of protecting the area around the balloon of a balloon catheter when it is temporarily withdrawn from the forceps channel of an endoscope can be provided.

[0022] This figure shows an example of an endoscopic system including a catheter set as one embodiment of the present disclosure. This figure shows the internal configuration of the endoscope shown in Figure 1, and shows the balloon catheter of the catheter set shown in Figure 1 inserted so as to penetrate the forceps channel. This figure shows the state in which the balloon of the balloon catheter has been removed from the forceps channel from the state shown in Figure 2. This is a perspective view showing the adapter of the catheter set shown in Figure 1. This is an exploded perspective view of the adapter shown in Figure 4. This is an exploded perspective view of the adapter shown in Figure 4. This figure shows the operation when attaching the connecting member of the adapter shown in Figure 4 to the forceps channel. This is a cross-sectional view of the adapter and forceps channel in the state in which the attachment operation shown in Figure 7 has been completed. This figure shows the state in which the connection of the adapter to the forceps channel has been completed from the state shown in Figure 8. This is a cross-sectional view of the adapter and forceps channel showing the state in which the balloon catheter has been inserted into the insertion hole of the adapter shown in Figure 9, and shows the state in which the gripping member of the adapter is in the released state. This is a cross-sectional view of the adapter and forceps channel showing the state in which the balloon catheter has been inserted into the insertion hole of the adapter shown in Figure 9, and shows the state in which the gripping member of the adapter is in the gripping state. Figure 13 shows the balloon catheter inserted into a tubular organ through the adapter's insertion port and the endoscope's forceps channel, with the balloon expanding within the tubular organ. Figure 14 shows the deflated balloon being withdrawn from the forceps channel after being deflated from the state shown in Figure 12. Figure 15 shows the deflated balloon, as shown in Figure 13, withdrawn from the forceps channel and housed in the adapter's insertion port. Figure 4 shows a catheter set including an adapter as a modified example of the adapter shown in Figure 4. Figure 16 shows the marker on the balloon catheter and the marker on the adapter body aligned.

[0023] Hereinafter, embodiments of the catheter set relating to this disclosure will be illustrated with reference to the drawings. In each figure, identical components are denoted by the same reference numerals.

[0024] Figure 1 shows an example of an endoscope system 100, including a catheter set 10 as one embodiment of the catheter set according to the present disclosure. The endoscope system 100 shown in Figure 1 comprises an endoscope 101, a control device 102 connected to the endoscope 101, a display unit 103, and a catheter set 10. The endoscope 101 is partitioned with a forceps channel 101a through which a treatment instrument can be inserted. The endoscope 101 also includes a connection unit 117 that can be connected to the control device 102, a suction device 104, a fluid delivery device 105, and an air delivery device 106, which will be described later. The control device 102 includes a light source unit 102a that supplies illumination light to the endoscope 101, and a processor unit 102b that performs various image processing on the imaging signal from the endoscope 101 and converts it into a video signal. The control device 102 may also include an input unit such as a keyboard. The display unit 103 may be, for example, a monitor that can communicate with the control device 102 by wired or wireless means. The wirelessly wireless monitor may be, for example, a tablet terminal. The display unit 103 can display images captured by the endoscope 101 based on the video signal generated by the processor unit 102b of the control device 102.

[0025] The catheter set 10 comprises a balloon catheter 20 and an adapter 30. The balloon catheter 20 is equipped with a balloon 21. The adapter 30 has an insertion hole 30a inside through which the balloon catheter 20 can be inserted. The adapter 30 can also be connected to the endoscope 101 with the insertion hole 30a communicating with the forceps channel 101a of the endoscope 101. The balloon catheter 20, as a treatment instrument, can be inserted into the forceps channel 101a of the endoscope 101 through the insertion hole 30a of the adapter 30 while the adapter 30 is connected to the endoscope 101.

[0026] As shown in Figure 1, the balloon catheter 20 is delivered to the lesion in a tubular organ through the forceps channel 101a of the endoscope 101. The balloon catheter 20 may be used, for example, for the treatment of gastrointestinal cancer through the forceps channel 101a of the endoscope 101 inserted into a tubular organ such as the gastrointestinal tract (esophagus, stomach, small intestine, large intestine, etc.) or the urinary tract (urethra, bladder, ureter, renal pelvis). The balloon catheter 20 may also be used, for example, for treatment by photodynamic therapy (PDT) or photoimmunotherapy (PIT). However, the tubular organ into which the balloon catheter 20 is inserted is not particularly limited. Nor is there any particular limitation on the type of treatment in which the balloon catheter 20 is used. Therefore, the balloon catheter 20 may be used for treatments other than the treatment of gastrointestinal cancer described above. Furthermore, the balloon catheter 20 may be used for treatments other than the PDT and PIT described above.

[0027] As shown in Figure 1, the endoscope 101 of this embodiment comprises an operating section 111, a flexible, elongated insertion section 112 connected to the operating section 111, and a connecting section 117 connected to the operating section 111. The operating section 111 is positioned outside the patient's body and is configured to be operable by a user such as an operator. The insertion section 112 is configured to be insertable into the patient's tubular organs. As shown in Figure 1, the forceps channel 101a of this embodiment penetrates from the forceps opening 113 provided in the operating section 111 to the distal end face 114 of the insertion section 112. The forceps opening 113 demarcates the proximal end of the forceps channel 101a. The connection portion 117 in this embodiment includes a connector portion 117a that can be connected to the control device 102, the suction device 104 (described later), the liquid supply device 105, and the air supply device 106, and a flexible, elongated cable portion 117b that connects the connector portion 117a to the operating portion 111.

[0028] Figures 2 and 3 show the internal configuration of the endoscope 101 shown in Figure 1. Figure 2 shows the balloon catheter 20 inserted through the forceps channel 101a of the endoscope 101. In contrast, Figure 3 shows the balloon 21 of the balloon catheter 20 removed from the forceps channel 101a from the state shown in Figure 2. As shown in Figures 2 and 3, the inside of the endoscope 101 is divided into a forceps channel 101a through which the balloon catheter 20 is inserted, a suction channel 101b that can aspirate body fluids and air from within the body, and a fluid / air supply channel 115 that can supply a liquid (e.g., water) for cleaning the lens attached to the distal end of the insertion section 112 of the endoscope 101, and can also supply a gas (e.g., air) to blow away the water on the lens.

[0029] The forceps channel 101a extends between a proximal opening 101a1 that opens at a forceps channel 113 provided in the operating section 111 and a distal opening 101a2 that opens at the distal end face 114 of the insertion section 112.

[0030] The suction channel 101b extends between the proximal opening 101b1, which opens at the connector portion 117a of the connecting portion 117, and the distal opening 101a2, which opens at the distal end face 114 of the insertion portion 112. In other words, the forceps channel 101a and the suction channel 101b share a portion that connects to the distal opening 101a2. The proximal opening 101b1 can be connected to the suction device 104 via the suction tube 104a.

[0031] The liquid-air supply channel 115 extends between a proximal opening 1151 that opens at the connector portion 117a of the connection portion 117 and a distal opening 1152 that opens at the distal end face 114 of the insertion portion 112. The proximal opening 1151 can be connected to the liquid supply device 105 via the liquid supply pipe 105a. The proximal opening 1151 can also be connected to the air supply device 106 via the air supply pipe 106a. In this embodiment, the liquid supply device 105 and the air supply device 106 are realized by a single liquid-air supply device that serves both purposes. Therefore, in this embodiment, the liquid supply pipe 105a and the air supply pipe 106a are the same pipe. Whether to perform liquid supply or air supply can be switched using a switch or the like provided on the operation unit 111. However, the liquid supply device 105 and the air supply device 106 may be provided separately, and the liquid supply pipe 105a and the air supply pipe 106a may also be provided separately. Furthermore, the liquid supply device 105 and the air supply device 106 may be configured integrally with the control device 102, or they may be configured as separate components separate from the control device 102.

[0032] In this embodiment, for the sake of explanation, the portion shared by the forceps channel 101a and the suction channel 101b will be referred to as "shared channel X1". The portion of the forceps channel 101a that is not shared with the suction channel 101b will be referred to as "forceps branch channel X2". Furthermore, the portion of the suction channel 101b that is not shared with the forceps channel 101a will be referred to as "suction branch channel X3".

[0033] As shown in Figures 2 and 3, the forceps branch channel X2 of this embodiment is bent at an obtuse angle with respect to the shared channel X1 within the operating section 111. The suction branch channel X3 of this embodiment is linearly connected to the shared channel X1 within the operating section 111. The proximal opening of the forceps branch channel X2, which is the proximal opening 101a1 of the forceps channel 101a, opens at the forceps port 113 formed on the projection 121 provided on the operating section 111.

[0034] When the fluid delivery device 105 is activated and fluid delivery is performed by operating the switches on the control unit 111, the liquid flowing from the fluid delivery pipe 105a into the proximal opening 1151 of the fluid delivery / air delivery channel 115 flows through the fluid delivery / air delivery channel 115 and then flows out into the body from the distal opening 1152. Similarly, when the air delivery device 106 is activated and air delivery is performed by operating the switches on the control unit 111, the gas flowing into the proximal opening 1151 of the fluid delivery / air delivery channel 115 flows through the fluid delivery / air delivery channel 115 and then flows out into the body from the distal opening 1152. Furthermore, when the suction device 104 is activated, the body fluids and air flowing in from the distal opening 101a2 flow through the suction channel 101b, that is, the shared channel X1 and the suction branch channel X3, and then flow out from the proximal opening 101b1 of the suction channel 101b through the suction pipe 104a to the suction device 104.

[0035] As described above, the forceps channel 101a of the endoscope 101 in this embodiment is partially shared with the suction channel 101b, which is another channel of the endoscope 101. Therefore, if it becomes necessary to perform aspiration of bodily fluids, etc., through the suction channel 101b during a procedure in which the balloon 21 of the balloon catheter 20 is inserted into the body through the shared channel X1, it is preferable to temporarily withdraw the balloon catheter 20 from the shared channel X1 in order to improve aspiration efficiency. After aspiration through the suction channel 101b is completed, the balloon catheter 20 can be reinserted into the body by reinserting it into the shared channel X1, thereby allowing the procedure to be resumed.

[0036] As shown in Figure 3, when the balloon catheter 20 is temporarily withdrawn from the shared channel X1, the balloon 21 of the balloon catheter 20 is also temporarily withdrawn from the shared channel X1. At this time, part or all of the balloon 21 of the balloon catheter 20 may also be withdrawn from the forceps branch channel X2 and exposed to the outside of the endoscope 101. In other words, part or all of the balloon 21 of the balloon catheter 20 may be withdrawn from the forceps channel 101a and exposed to the outside of the endoscope 101. Thus, a situation may occur during the procedure in which part or all of the balloon 21 of the balloon catheter 20 is temporarily withdrawn from the forceps channel 101a and exposed to the outside of the endoscope 101.

[0037] In contrast, the catheter set 10 includes an adapter 30 in addition to the balloon catheter 20. As described above, the adapter 30 has an insertion hole 30a inside through which the balloon catheter 20 can be inserted. Also, as shown in Figures 2 and 3, the adapter 30 can be connected to the endoscope 101 with the insertion hole 30a communicating with the forceps channel 101a of the endoscope 101. As shown in Figure 3, the insertion hole 30a of the adapter 30 can accommodate at least a portion of the balloon 21 of the balloon catheter 20 when it is withdrawn from the forceps channel 101a of the endoscope 101 while the adapter 30 is connected to the endoscope 101. Therefore, even if a portion or all of the balloon 21 of the balloon catheter 20 is temporarily withdrawn from the forceps channel 101a, at least a portion of it is protected by the insertion hole 30a of the adapter 30. This prevents the balloon 21, which is temporarily withdrawn from the forceps channel 101a, from being contaminated (e.g., bacterial contamination) from the surroundings.

[0038] In particular, as shown in Figure 3, the insertion hole 30a of the adapter 30 in this embodiment can accommodate the entire length of the balloon 21 in the longitudinal direction D of the balloon catheter 20. Therefore, even if the entire balloon 21 is completely withdrawn from the forceps channel 101a, the entire length of the balloon 21 in the longitudinal direction D can be accommodated within the insertion hole 30a. As a result, contamination of the balloon 21 from the surroundings while it is temporarily withdrawn from the forceps channel 101a can be further suppressed.

[0039] Next, further details of the catheter set 10 of this embodiment will be described. As described above, the catheter set 10 comprises a balloon catheter 20 and an adapter 30.

[0040] <Balloon Catheter 20> The balloon catheter 20 of this embodiment comprises a balloon 21 and a shaft 22 that holds the balloon 21. Hereinafter, in the balloon catheter 20, the direction along the central axis of the shaft 22 will be referred to as "axial direction A". In this embodiment, the longitudinal direction D of the balloon catheter 20 described above is the same direction as axial direction A. In addition, in the balloon catheter 20, the circumferential direction around the central axis of the shaft 22 will be referred to as "circumferential direction B". Furthermore, in the balloon catheter 20, the radial direction of a virtual circle centered on the central axis of the shaft 22 in a plane perpendicular to the central axis of the shaft 22 will be referred to as "radial direction C".

[0041] The balloon 21 covers the outside in the radial direction C of the shaft 22 and is configured to be able to expand and contract in the radial direction C. Specifically, the balloon 21 of the present embodiment is constituted by a film body that covers the periphery of the shaft 22. The film body constituting the balloon 21 is arranged in a state of surrounding the periphery outside the radial direction C of the shaft 22. And the distal end portions and proximal end portions on both sides in the axial direction A of the film body constituting the balloon 21 are joined to the outer surface of the shaft 22. Thereby, the balloon 21 of the present embodiment partitions an annular fluid accommodation space 21a (see FIG. 1) between the outer surface of the shaft 22. The balloon 21 of the present embodiment can expand to the outside in the radial direction C when fluid is supplied to the fluid accommodation space 21a. Further, the balloon 21 of the present embodiment can contract to the inside in the radial direction C when the fluid is discharged from the fluid accommodation space 21a.

[0042] The balloon 21 may be constituted by, for example, a transparent resin. Examples of the constituent material of the balloon 21 include polyethylene terephthalate, polyurethane, polyamide, polyamide elastomer, and a laminate of a plurality of materials selected from these materials, and the like.

[0043] The shaft 22 only needs to have flexibility that can be deformed along the forceps channel 101a of the endoscope 101 and the luminal organ, and its configuration is not particularly limited. The shaft 22 may be, for example, a tubular body. Further, the shaft 22 may be, for example, a tubular body having a double tube structure including an inner tube and an outer tube.

[0044] The shaft 22 of the present embodiment partitions a flow path that communicates with the fluid accommodation space 21a of the balloon 21. The flow path may be, for example, a lumen formed in the shaft 22. However, the shaft 22 may be configured not to partition the flow path. In such a case, the flow path may be partitioned inside a tubular body provided separately from the shaft 22 and extending along the shaft 22, for example.

[0045] As shown in Figure 1, the shaft 22 has a distal projection 22a that protrudes distal to the balloon 21 in the axial direction A. For example, radiopaque markers may be provided on the distal projection 22a and at the connection point between the balloon 21 and the shaft 22. The balloon 21 is held by the shaft 22 near its distal end. Therefore, the axial length A of the main shaft portion 22b that extends proximal to the balloon 21 is longer than the axial length A of the distal projection 22a. The balloon 21 may be held by the shaft 22 with a portion of it protruding even further distal to the distal end of the shaft 22. In other words, the shaft 22 may be configured without a distal projection 22a.

[0046] The shaft 22 may be made of, for example, a transparent resin. Examples of resin materials for the shaft 22 include: polyethylene, polypropylene, polyolefins such as ethylene-propylene copolymer; ethylene-vinyl acetate copolymer (EVA); polyvinyl chloride; polyvinylidene chloride; polystyrene; polyamide; polyamide elastomer; polyimide; polyamide-imide; polycarbonate; poly-(4-methylpentene-1); ionomer; acrylic resin; polymethyl methacrylate; acrylonitrile-butadiene-styrene copolymer (ABS resin); acrylonitrile-styrene copolymer (AS resin); butadiene-styrene copolymer; poly Examples of resin materials include polyesters such as ethylene terephthalate (PET), polybutylene terephthalate (PBT), and polycyclohexane terephthalate (PCT); polyethers; polyether ketones (PEK); polyether ether ketones (PEEK); polyetherimides; polyacetals (POM); polyphenylene oxide; modified polyphenylene oxide; polysulfone; polyethersulfone; polyphenylene sulfide; polyarylate; aromatic polyesters (liquid crystal polymers); polytetrafluoroethylene, polyvinylidene fluoride, and other fluorinated resins. Blends containing one or more of these materials are also acceptable.

[0047] <Adapter 30> Next, the details of the adapter 30 of this embodiment will be described. FIG. 4 is a perspective view showing the adapter 30. In FIG. 4, for convenience of explanation, the balloon catheter 20 inserted into the insertion hole 30a is shown by a two-dot chain line. FIGS. 5 and 6 are exploded perspective views of the adapter 30 seen from different viewpoints. FIGS. 7 to 9 are views showing how the adapter 30 is connected to the forceps port 113 of the endoscope 101. Specifically, FIG. 7 is a view showing the operation when the connecting member 33 of the adapter 30 is attached to the forceps port 113. FIG. 8 is a cross-sectional view of the adapter 30 and the forceps port 113 in a state where the attachment operation shown in FIG. 7 is completed. FIG. 9 is a view showing a state where the connection of the adapter 30 to the forceps port 113 is completed from the state shown in FIG. 8. FIGS. 10 and 11 are cross-sectional views of the adapter 30 and the forceps port 113 showing a state where the balloon catheter 20 is inserted into the insertion hole 30a of the adapter 30 shown in FIG. 9. FIG. 10 shows a released form of the gripping member 32 described later. FIG. 11 shows a gripping form of the gripping member 32 described later. In FIGS. 10 and 11, for convenience of explanation, the shaft 22 of the balloon catheter 20 inserted into the insertion hole 30a is shown in a side view.

[0048] As described above, the adapter 30 defines an insertion hole 30a through which the balloon catheter 20 is inserted. Hereinafter, in the adapter 30, the direction in which the balloon catheter 20 is inserted into the insertion hole 30a will be referred to as the "insertion direction E". In the present embodiment, in a state where the balloon catheter 20 is inserted into the insertion hole 30a, the above-described insertion direction E substantially coincides with the longitudinal direction D and the axial direction A of the balloon catheter 20.

[0049] As shown in FIGS. 5 and 6, the adapter 30 of the present embodiment includes an adapter body 31, a gripping member 32, a connecting member 33, and a sealing member 34.

[0050] The adapter body 31 defines the insertion hole 30a. More specifically, the adapter body 31 of the present embodiment includes a cylindrical portion 31a that defines the insertion hole 30a inside, and a plurality of blade portions 31b that project from the cylindrical portion 31a.

[0051] The cylindrical portion 31a of this embodiment comprises a distal cylindrical portion 40, an annular wall portion 41, and a proximal cylindrical portion 42. The distal cylindrical portion 40 has a male threaded portion 40a on its outer circumferential surface that can be screwed into a connecting member 33, which will be described later. In the state shown in Figure 8, the position of the insertion direction E of the distal end face 40b of the distal cylindrical portion 40 of this embodiment substantially coincides with the position of the insertion direction E of the distal end face 34b of the sealing member 34. The annular wall portion 41 covers the proximal side of the distal cylindrical portion 40. The annular wall portion 41 also demarcates the central opening 41a (see Figures 8 and 9). The proximal cylindrical portion 42 protrudes proximal from the inner edge of the annular wall portion 41.

[0052] The proximal tube portion 42 is narrower than the distal tube portion 40. Specifically, the outer diameter of the proximal tube portion 42 is smaller than the outer diameter of the distal tube portion 40. Also, the inner diameter of the proximal tube portion 42 is smaller than the inner diameter of the distal tube portion 40. In this embodiment, the insertion hole 30a is formed from the distal tube portion 40 through the central opening 41a of the annular wall portion 41 to the proximal tube portion 42.

[0053] In this embodiment, the minimum diameter L1 of the insertion hole 30a of the adapter 30 (see Figure 8) is smaller than the maximum diameter L2 of the expanded balloon 21 (see Figure 1). The details of this will be described later.

[0054] The wing portion 31b protrudes from the outer surface of the cylindrical portion 31a in a direction perpendicular to the insertion direction E. More specifically, in this embodiment, the wing portion 31b protrudes from the outer surface of the proximal cylindrical portion 42 of the cylindrical portion 31a toward the radially outward direction of the cylindrical portion 31a. The radial direction of the cylindrical portion 31a substantially coincides with the radial direction C of the balloon catheter 20 when the balloon catheter 20 is inserted through the insertion hole 30a. Therefore, hereafter, the radial direction of the cylindrical portion 31a will also be simply referred to as "radial direction C".

[0055] Furthermore, in this embodiment, multiple wing portions 31b are arranged at different positions in the circumferential direction of the cylindrical portion 31a. Specifically, in this embodiment, four wing portions 31b are arranged at equally spaced intervals in the circumferential direction of the cylindrical portion 31a. The circumferential direction of the cylindrical portion 31a is approximately the same as the circumferential direction B of the balloon catheter 20 when the balloon catheter 20 is inserted through the insertion hole 30a. Therefore, hereafter, the circumferential direction of the cylindrical portion 31a will also be simply referred to as "circumferential direction B".

[0056] In this embodiment, the blade portion 31b has a thickness direction B in the circumferential direction and is composed of a plate-like portion extending in the insertion direction E. More specifically, in this embodiment, the blade portion 31b has a tapered portion 31b1 that extends to the proximal end of the blade portion 31b, with the length in the radial direction C gradually decreasing towards the proximal side.

[0057] As described above, the adapter 30 of this embodiment is equipped with four blade portions 31b arranged at different positions in the circumferential direction B, but the number of blade portions 31b is not particularly limited. The number of blade portions 31b may be set appropriately based on the viewpoint of reinforcing the cylindrical portion 31a and the viewpoint of making the adapter body 31 easy to grip.

[0058] Furthermore, the proximal cylindrical portion 42 of the cylindrical portion 31a in this embodiment protrudes proximally from the plurality of wing portions 31b and has a fixed end portion 42a to which the gripping member 32, which will be described later, can be fixed.

[0059] The adapter body 31 of this embodiment is made of a transparent material. More specifically, the adapter body 31 of this embodiment may be made of a transparent resin material.

[0060] Furthermore, the adapter body 31 of this embodiment is made of a rigid material that does not have flexibility. Here, "not flexible" means a rigidity such that it does not bend during use by a user such as a surgeon. The rigidity of the adapter body 31 may be ensured by the rigidity of the cylindrical portion 31a itself, or it may be ensured by reinforcing the cylindrical portion 31a with the wing portion 31b described above.

[0061] For example, the materials listed as examples for the materials used for the shaft 22 of the balloon catheter 20 described above can be used as the constituent materials for the adapter body 31.

[0062] The gripping member 32 is fixed to the adapter body 31. Specifically, the gripping member 32 in this embodiment is fixed to the adapter body 31 on the proximal side of the insertion hole 30a. More specifically, the gripping member 32 in this embodiment is fixed to the fixed end 42a of the proximal cylindrical portion 42, which constitutes the proximal end of the cylindrical portion 31a of the adapter body 31.

[0063] The gripping member 32 can change its shape between a gripping state and a release state. As shown in Figure 11, the gripping state of the gripping member 32 is a state in which the gripping member 32 grips the shaft 22 of the balloon catheter 20 that is inserted through the insertion hole 30a. In contrast, as shown in Figure 10, the release state of the gripping member 32 is a state in which the gripping member 32 does not grip the shaft 22 of the balloon catheter 20 that is inserted through the insertion hole 30a. When the gripping member 32 is in the gripping state, the gripping member 32 can hold the balloon catheter 20 so that it does not move axially A within the insertion hole 30a (see Figure 11). Conversely, as shown in Figure 10, when the gripping member 32 is in the release state, the balloon catheter 20 can move axially A within the insertion hole 30a. With such a gripping member 32 provided, the gripping member 32 can grip the shaft 22 while the balloon 21 (see Figure 1, etc.) is housed in the insertion hole 30a. This makes it easy to maintain the state in which the balloon 21 is housed and protected in the insertion hole 30a. Conversely, when reinserting the balloon catheter 20 into the forceps channel 101a, the gripping member 32 is changed from a gripping form (see Figure 11) to a released form (see Figure 10). This allows the balloon catheter 20 to be easily reinserted into the forceps channel 101a.

[0064] As shown in Figures 4 to 11, the gripping member 32 of this embodiment, when fixed to the adapter body 31 (see Figure 4, etc.), demarcates the gripping hole 32a that communicates with the proximal side of the insertion hole 30a. As shown in Figure 11, the gripping member 32 grips the shaft 22 of the balloon catheter 20 inserted into the gripping hole 32a by clamping it from the outside to the inside in the radial direction C, thereby gripping the shaft 22. By gripping the shaft 22, the gripping member 32 can hold the balloon catheter 20 so that it does not move axially A through the insertion hole 30a. Conversely, as shown in Figure 10, the gripping member 32 does not grip the shaft 22 of the balloon catheter 20 inserted into the gripping hole 32a by not clamping it from the outside to the inside in the radial direction C, thereby releasing the shaft 22. Because the gripping member 32 does not grip the shaft 22, the balloon catheter 20 can move axially A through the insertion hole 30a. The gripping member 32 in the gripping configuration may hold the balloon catheter 20 so that the balloon catheter 20 does not move in the axial direction A and in the circumferential direction B through the insertion hole 30a. This prevents the balloon 21 housed in the insertion hole 30a from moving in the circumferential direction B and rubbing against the inner surface of the insertion hole 30a, thereby preventing damage to the balloon 21 housed and protected in the insertion hole 30a and peeling off of the coating covering the outer surface of the balloon 21.

[0065] More specifically, the gripping member 32 of this embodiment comprises a pair of screwable annular bodies 50 and 51, and an elastic ring 52 sandwiched between these annular bodies 50 and 51. The gripping hole 32a of this embodiment is composed of the hollow portions of the pair of annular bodies 50 and 51, and the hollow portion of the elastic ring 52. In this embodiment, one of the pair of annular bodies 50 and 51 (annular body 51 in this embodiment) has a male threaded portion, and the other (annular body 50 in this embodiment) has a female threaded portion. By changing the screwed state of these male and female threaded portions, the compression state of the elastic ring 52 sandwiched between the pair of annular bodies 50 and 51 in the ring axis direction (the same direction as the insertion direction E) can be changed. When the elastic ring 52 is compressed in the ring axis direction, it deforms to bulge in the ring diameter direction. Therefore, by changing the compression state of the elastic ring 52 in the ring axis direction, the inner diameter of the elastic ring 52 also changes. As a result, the shaft 22 of the balloon catheter 20, which is inserted through the gripping hole 32a, can change its state between being gripped by the inner surface of the elastic ring 52 and not being gripped by the inner surface of the elastic ring 52 in the gripping hole 32a. In other words, the gripping member 32 of this embodiment is configured to change its form between a gripping state (see Figure 11) and a released state (see Figure 10) by adjusting the compression state of the elastic ring 52 in the ring axis direction (the same direction as the insertion direction E).

[0066] However, the gripping member 32 only needs to be configured to switch between a gripping state and a release state, and its configuration is not particularly limited. Therefore, the gripping member 32 is not limited to the configuration comprising the pair of annular bodies 50, 51 and the elastic ring 52 of this embodiment.

[0067] In this embodiment, the gripping member 32 is fixed to the adapter body 31 by joining one annular body 51 to the fixed end 42a of the proximal cylindrical portion 42 by screwing or the like. However, the fixing of the gripping member 32 to the adapter body 31 is not limited to joining by screwing as described above, but may also be done by bonding, welding, or the like.

[0068] The connecting member 33 can be connected to the forceps channel 113 of the endoscope 101. In this embodiment, the connecting member 33 also has a female threaded portion 60a that screws into the male threaded portion 40a of the adapter body 31. The connecting member 33 can be connected to the adapter body 31 by screwing the male threaded portion 40a and the female threaded portion 60a together.

[0069] Specifically, the connecting member 33 of this embodiment comprises a cylindrical portion 60, a distal wall portion 61, and a butt wall portion 62.

[0070] The cylindrical portion 60 in this embodiment is cylindrical in shape. A female threaded portion 60a is formed on the inner surface of the cylindrical portion 60, which can be screwed into the male threaded portion 40a of the adapter body 31 described above. The distal wall portion 61 is positioned to cover the distal side of the cylindrical portion 60. As shown in Figure 7, a receiving opening 63 is formed at a position spanning the peripheral wall of the cylindrical portion 60 and the distal wall portion 61, extending from the radially outside to the inside of the cylindrical portion 60, allowing the forceps channel 113 of the endoscope 101 to be received into the cylindrical portion 60. Here, the radial direction of the cylindrical portion 60 is approximately the same as the radial direction of the cylindrical portion 31a of the adapter body 31 when the connecting member 33 is connected to the adapter body 31 (see Figure 4, etc.). Therefore, the radial direction of the cylindrical portion 60 will also be simply referred to as "radial direction C" below. As shown in Figure 7, the connecting member 33 of this embodiment can be connected to the forceps channel 113 of the endoscope 101 by moving it linearly in the radial direction C and receiving the forceps channel 113 in the receiving opening 63.

[0071] As shown in Figure 8, when the forceps channel 113 is inserted into the cylindrical portion 60 through the receiving opening 63, the distal wall portion 61 is received by the recess 113a formed on the side surface of the forceps channel 113. Therefore, as shown in Figure 8, when the forceps channel 113 is inserted into the cylindrical portion 60 through the receiving opening 63, the connecting member 33 is restricted from moving in the axial direction E1 away from the forceps channel 113 of the endoscope 101. Here, the axial direction of the cylindrical portion 60 is approximately the same as the insertion direction E of the adapter 30 when the connecting member 33 is connected to the adapter body 31 (see Figure 4, etc.). Therefore, hereafter, the axial direction of the cylindrical portion 60 will simply be referred to as the "insertion direction E".

[0072] More specifically, as shown in Figure 7, the forceps channel 113 of the endoscope 101 is formed on the projection 121 of the operating section 111. The forceps channel 113 comprises a base section 131, a cylindrical section 132, and a flange section 133. The base section 131 is formed by the base end of the projection 121. The cylindrical section 132 protrudes from the base section 131. The flange section 133 protrudes radially outward from the tip of the cylindrical section 132. In other words, the flange section 133 is an enlarged diameter section with a larger outer diameter than the cylindrical section 132. As shown in Figures 5 and 7, the receiving opening 63 of this embodiment includes a through-hole 63a that penetrates the peripheral wall of the cylindrical section 60 radially C, through which the flange section 133 of the forceps channel 113 can pass. Furthermore, the receiving opening 63 in this embodiment includes a receiving recess 63b formed in the distal wall portion 61 so as to be continuous with the through hole portion 63a. The receiving recess 63b is recessed from the outer edge of the distal wall portion 61 in the radial direction C toward the inner side of the radial direction C.

[0073] Therefore, when the flange portion 133 of the forceps channel 113 passes through the through hole portion 63a of the receiving opening 63 from the outside to the inside in the radial direction C, the cylindrical portion 132 of the forceps channel 113 is accommodated in the receiving recess 63b of the receiving opening 63. Then, as shown in Figure 8, the separation direction E1 of the distal wall portion 61 of the connecting member 33 is covered by the flange portion 133 of the forceps channel 113. In other words, the distal wall portion 61 of the connecting member 33 enters a position opposite to the separation direction E1 relative to the flange portion 133 (in this embodiment, a position around the cylindrical portion 132) so that the separation direction E1 is covered by the flange portion 133 of the forceps channel 113. As a result, even if an attempt is made to move the connecting member 33 in the direction E1 away from the forceps opening 113, the distal wall portion 61 of the connecting member 33 abuts against the flange portion 133 of the forceps opening 113, restricting further movement of the connecting member 33 in the direction E1 away from the forceps opening.

[0074] In other words, the connecting member 33 of this embodiment is equipped with a movement restricting portion that restricts the movement of the connecting member 33 in the separation direction E1 by engaging with the forceps opening 113. More specifically, the movement restricting portion of this embodiment is equipped with a distal wall portion 61 as an engaging portion that restricts the movement of the connecting member 33 in the separation direction E1 by abutting against the flange portion 133 of the forceps opening 113, which covers the separation direction E1.

[0075] However, the movement restricting portion is not limited to the configuration including the distal wall portion 61 of this embodiment. The movement restricting portion may have any other configuration as long as it engages with the forceps opening 113 to restrict the movement of the connecting member 33 in the separation direction E1.

[0076] Furthermore, the abutment wall portion 62 is configured to abut against the side surface of the forceps opening 113 when the connecting member 33 is attached to the forceps opening 113 (see Figure 8) by rotating the connecting member 33 in the circumferential direction of the cylindrical portion 60. This restricts the rotation of the connecting member 33 relative to the forceps opening 113. Here, the circumferential direction of the cylindrical portion 60 is approximately the same as the circumferential direction of the cylindrical portion 31a of the adapter body 31 when the connecting member 33 is connected to the adapter body 31 (see Figure 4). Therefore, the circumferential direction of the cylindrical portion 60 will also be simply referred to as "circumferential direction B" below.

[0077] Specifically, the abutment wall portion 62 in this embodiment protrudes distally from the distal wall portion 61. Furthermore, the connecting member 33 in this embodiment has two abutment wall portions 62 positioned opposite each other in the radial direction C. In this embodiment, the abutment wall portions 62 are positioned so as to face the side surface of the base portion 131 of the forceps channel 113 when the connecting member 33 is attached to the forceps channel 113 (see Figure 8). Therefore, if the connecting member 33 attempts to rotate in the circumferential direction B relative to the forceps channel 113, the abutment wall portions 62 will abut against the base portion 131 of the forceps channel 113. This restricts the connecting member 33 from rotating relative to the forceps channel 113.

[0078] Thus, the connecting member 33 of this embodiment is equipped with a rotation restricting portion that, by engaging with the forceps opening 113, restricts the connecting member 33 from rotating relative to the forceps opening 113. More specifically, the rotation restricting portion of this embodiment is equipped with a stopper wall portion 62 that, by abutting against the side surface of the forceps opening 113, restricts the connecting member 33 from rotating relative to the forceps opening 113.

[0079] The connecting member 33 in this embodiment includes two abutment walls 62, but the number of abutment walls 62 is not particularly limited. For example, only one abutment wall 62 may be provided, as long as it abuts against the side surface of the forceps opening 113 and restricts the connecting member 33 from rotating relative to the forceps opening 113.

[0080] Furthermore, the rotation restricting portion is not limited to the configuration including the abutment wall portion 62 of this embodiment. The rotation restricting portion may have any other configuration as long as it engages with the forceps opening 113 to restrict the connecting member 33 from rotating in the circumferential direction B relative to the forceps opening 113.

[0081] The sealing member 34 is configured to close the gaps between the forceps channel 113 of the endoscope 101, the adapter body 31, and the connecting member 33.

[0082] As shown in Figures 8 and 9, the sealing member 34 is a cylindrical elastic body housed in the hollow portion of the distal cylindrical portion 40 of the adapter body 31. In this embodiment, the sealing member 34 is housed in the hollow portion of the distal cylindrical portion 40 of the adapter body 31 such that its axial direction is aligned with the insertion direction E.

[0083] The male threaded portion 40a of the adapter body 31 and the female threaded portion 60a of the connecting member 33 are screwed together to tighten them, changing the state from that shown in Figure 8 to that shown in Figure 9. As a result, the sealing member 34, together with the flange portion 133 of the forceps opening 113, is sandwiched between the annular wall portion 41 of the adapter body 31 and the distal wall portion 61 of the connecting member 33 in the insertion direction E, and is compressed and deformed in the insertion direction E. At this time, the proximal end face 34a of the sealing member 34 abuts against the vicinity of the edge of the central opening 41a of the annular wall portion 41 of the adapter body 31. The distal end face 34b of the sealing member 34 abuts against the flange portion 133 of the forceps opening 113. Furthermore, the distal end face 40b of the distal cylindrical portion 40 abuts against the proximal end face 61a of the distal wall portion 61 of the connecting member 33. Therefore, when the adapter 30 shown in Figure 9 is connected to the forceps channel 113, the forceps channel 101a is in airtight communication with the insertion hole 30a of the adapter body 31 via the internal space of the sealing member 34. In other words, by providing such a sealing member 34, it is possible to suppress gas leakage to the outside through minute gaps that may be formed at the connection point between the adapter body 31 and the connecting member 33, and at the connection point between the connecting member 33 and the forceps channel 113. Therefore, for example, when the balloon 21 of the balloon catheter 20 (see Figure 1, etc.) is temporarily removed from the forceps channel 101a so that it is housed in the insertion hole 30a of the adapter 30, and the shaft 22 of the balloon catheter 20 is gripped by the gripping member 32 (see Figure 11), the insertion hole 30a can be maintained in an airtight state. This prevents gas leakage from the connection between the adapter 30 and the forceps channel 113, which can reduce suction efficiency, when, for example, aspirating bodily fluids through the suction channel 101b (see Figures 2 and 3).

[0084] Furthermore, as shown in Figures 5, 6, and 8 to 11, the sealing member 34 of this embodiment comprises a cylindrical body 70 and an annular projection 71 formed on the outer circumferential surface of the cylindrical body 70. As described above, in the insertion direction E, the cylindrical body 70 is compressed and deformed in the insertion direction E by being sandwiched between the annular wall portion 41 of the adapter body 31 and the distal wall portion 61 of the connecting member 33, together with the flange portion 133 of the forceps port 113. Also, as shown in Figure 8, the sealing member 34 is in contact with the inner surface of the distal cylindrical portion 40 at the position of the annular projection 71. As a result, the sealing member 34 is sandwiched by the inner surface of the distal cylindrical portion 40 and held in the hollow portion of the distal cylindrical portion 40. Furthermore, with the adapter 30 shown in Figure 9 connected to the forceps port 113, the annular projection 71 of the sealing member 34 is airtightly sandwiched by the inner surface of the distal cylindrical portion 40.

[0085] Furthermore, because the sealing member 34 is equipped with the annular projection 71 described above, as shown in Figure 8, the sealing member 34 can be held in the hollow portion of the distal cylindrical portion 40 while leaving a gap between the sealing member 34 and the inner surface of the distal cylindrical portion 40. Due to this gap, the cylindrical body 70 is more likely to bulge outward in the radial direction C when compressed in the insertion direction E. In other words, the provision of the annular projection 71 enhances the compressive deformation performance of the cylindrical body 70 in the insertion direction E.

[0086] The sealing member 34 in this embodiment has a cylindrical body 70 and an annular projection 71, but is not limited to this configuration. The sealing member 34 may have any other configuration as long as it can ensure airtightness at the connection point between the adapter 30 and the forceps channel 113.

[0087] Finally, an example of a procedure performed using the catheter set 10 of this embodiment will be described with reference to Figures 12 to 14. Figures 12 to 14 show the catheter set 10 with the adapter 30 connected to the forceps channel 113 of the endoscope 101. Figure 12 shows the balloon catheter 20 inserted into a tubular organ through the insertion hole 30a of the adapter 30 and the forceps channel 101a of the endoscope 101, with the balloon 21 expanding within the tubular organ. Figure 13 shows the deflated balloon 21 being removed from the forceps channel 101a after it has deflated from the state shown in Figure 12. Figure 14 shows the deflated balloon 21 being removed from the forceps channel 101a and housed in the insertion hole 30a of the adapter 30. Figure 14 also shows the gripping member 32 in a gripping configuration.

[0088] As shown in Figure 12, the balloon catheter 20 can be inserted into the forceps channel 101a of the endoscope 101 through the insertion hole 30a of the adapter 30 which is connected to the forceps channel 113 of the endoscope 101. The balloon 21 of the balloon catheter 20 is then inserted into the tubular organ of the patient in a deflated state, and the balloon 21 is then expanded at or near the lesion in the tubular organ, and treatment of the lesion is performed.

[0089] During a procedure using the balloon 21, it may be necessary to aspirate bodily fluids, air, etc., from the patient's tubular organs through the suction channel 101b of the endoscope 101. In such cases, the balloon 21 is changed from an expanded state to a deflated state. Then, as shown in Figures 13 and 14, the deflated balloon 21 is temporarily removed from the forceps channel 101a. After that, bodily fluids, air, etc., from the patient's tubular organs are aspirated through the suction channel 101b. At this time, the balloon 21 is housed in the insertion hole 30a of the adapter 30. Therefore, the balloon 21 is protected from its surroundings. As a result, contamination of the balloon 21 can be suppressed. In addition, by changing the shape of the gripping member 32 from an open state to a gripping state, the shaft 22 is held by the gripping member 32, and the state in which the balloon 21 is housed in the insertion hole 30a can be easily maintained. Furthermore, the gripping member 32 grips the shaft 22, which improves the airtightness of the insertion hole 30a and enhances the suction efficiency of the suction channel 101b.

[0090] Furthermore, the minimum diameter L1 of the insertion hole 30a of the adapter 30 in this embodiment (see Figure 8) is smaller than the maximum diameter L2 of the expanded balloon 21 (see Figure 1). Specifically, the minimum diameter L1 of the insertion hole 30a refers to the minimum length of the insertion hole 30a in the direction perpendicular to the insertion direction E. In this embodiment, the minimum diameter L1 of the insertion hole 30a is the minimum inner diameter of the proximal tube portion 42. Also, the maximum diameter L2 of the expanded balloon 21 is the maximum length of the expanded balloon 21 in the radial direction C. By making the minimum diameter L1 of the insertion hole 30a smaller than the maximum diameter L2 of the expanded balloon 21, the diameter of the balloon 21 housed in the insertion hole 30a can be corrected to be smaller than the maximum diameter L2 of the expanded balloon 21. This improves the insertability of the balloon 21 when reinserting it into the forceps channel 101a. In this embodiment, the minimum diameter L1 of the insertion hole 30a is larger than the outer diameter of the shaft 22.

[0091] After the suction of bodily fluids, air, etc., from the subject's tubular organs through the suction channel 101b is completed, the gripping member 32 is changed from a gripping form to a released form. This allows the balloon catheter 20 to be reinserted into the forceps channel 101a. The deflated balloon 21 is reinserted into the tubular organ through the forceps channel 101a and expanded again at or near the lesion. This allows the treatment of the lesion using the balloon 21 to be resumed.

[0092] Thus, the catheter set 10 includes an adapter 30 that partitions an insertion hole 30a capable of accommodating the balloon 21, which is temporarily removed from the forceps channel 101a of the endoscope 101. This prevents the balloon 21, which is temporarily removed from the forceps channel 101a of the endoscope 101, from being contaminated from the outside. Furthermore, since the balloon 21 remains deflated within the insertion hole 30a of the adapter 30, the balloon 21 can be easily reinserted into the forceps channel 101a.

[0093] The catheter set relating to this disclosure is not limited to the specific configuration shown in the embodiments described above, and various modifications, changes, and combinations are possible without departing from the scope of the claims. The adapter body 31 in the embodiments described above is made of a rigid material that does not have flexibility, but the invention is not limited to this configuration. As shown in Figure 15, the adapter body 331 may be made of a flexible soft material, for example. "Flexible" means a hardness that can be reversibly deformed by the external force applied to the adapter 30 when used by a user such as an operator. In this case, the adapter body 331 may be, for example, a resin tube. Also, if the adapter body 31 is made of a transparent material, a marker may be provided on the balloon catheter 20. In this case, the marker provided on the balloon catheter 20 is visible, for example, at a position on the adapter body 31 that is exposed to the outside proximal to the proximal end of the tapered portion 31b1. In the embodiments described above, for example, this is the position of the part of the fixed end 42a that is exposed to the outside and not covered by the gripping member 32. In other words, it is the position of the recess 80 (see Figure 8) formed by the adapter body 31 and the gripping member 32. By visually confirming that the marker is located in the aforementioned recess 80, the balloon catheter 20 can be viewed from the closest possible distance from the outside of the adapter body 31, and the balloon 21 of the balloon catheter 20 can be temporarily withdrawn from the forceps channel 101a to the appropriate position on the adapter body 31. An example of a marker provided on the balloon catheter 20 is the end of the coating covering the outer surface of the balloon 21 of the balloon catheter 20 in the axial direction A. Another example of a marker provided on the balloon catheter 20 is a boundary formed by at least one of the hue, saturation, and brightness being different between two adjacent members constituting the balloon catheter 20, or a part of the balloon catheter 20 that is identifiable from the outside by at least one of the hue, saturation, and brightness being different from the surrounding part.Alternatively, the balloon 21 of the balloon catheter 20 may be temporarily withdrawn from the forceps channel 101a to an appropriate position on the adapter body 31 by aligning a marker provided on the balloon catheter 20 with, for example, a marker provided on the adapter body 31. Examples of markers provided on the adapter body 31 include a part of the adapter body 31 that is identifiable from the outside by having at least one of the hue, saturation, and brightness different from the surrounding part, and a notch 31b2 such as a slit formed in the wing portion 31b of the adapter body 31 (see Figure 16). Figure 16 shows a state in which the boundary 23, which serves as a marker provided on the balloon catheter 20, and the notch 31b2, which serves as a marker provided on the adapter body 31, are aligned in the axial direction A. More specifically, in Figure 16, the position in the axial direction A of the boundary 23 and the position in the axial direction A of the notch 31b2 are approximately the same. The balloon 21 and shaft 22 shown in Figure 16 differ in at least one of the following: hue, saturation, and lightness. This creates an externally identifiable boundary 23 between the balloon 21 and the shaft 22.

[0094] This disclosure relates to a catheter set.

[0095] 10: Catheter set 20: Balloon catheter 21: Balloon 21a: Fluid containment space 22: Shaft 22a: Distal projection 22b: Main part of shaft 23: Boundary between balloon and shaft 30: Adapter 30a: Insertion hole 31, 331: Adapter body 31a: Cylindrical part 31b: Wing part 31b1: Tapered part 31b2: Notch part 32: Gripping member 32a: Gripping hole 33: Connecting member 34: Sealing member 34a: Proximal end face 34b: Distal end face 40: Distal cylindrical part 40a: Male thread part 40b: Distal end face 41: Annular wall part 41a: Central opening 42: Proximal cylindrical part 42a: Fixed end part 50, 51: Annular body 52: Elastic ring 60: Cylindrical part 60a: Female thread part 61: Distal wall portion 61a: Proximal end face 62: Butt wall portion 63: Receiving opening 63a: Through hole portion 63b: Receiving recess 70: Cylindrical body 71: Annular projection portion 80: Recess 100: Endoscope system 101: Endoscope 101a: Forceps channel 101a1: Proximal opening of forceps channel 101a2: Distal opening of forceps channel 101b: Suction channel 101b1: Proximal opening of suction channel 102: Control device 102a: Light source portion 102b: Processor portion 103: Display portion 104: Suction device 104a: Suction tube 105: Fluid delivery device 105a: Fluid delivery tube 106: Air delivery device 106a: Air delivery tube 111: Operation portion 112: Insertion portion 113: Forceps opening 113a: Recess of the forceps channel 115: Fluid delivery channel 1151: Proximal opening of the fluid delivery channel 1152: Distal opening of the fluid delivery channel 117: Connection part 117a: Connector part 117b: Cable part 121: Projection part 131: Base part of the forceps channel 132: Tubular part of the forceps channel 133: Flange part of the forceps channel A: Axial direction of the balloon catheter B: Circumferential direction of the balloon catheter C: Radial direction of the balloon catheter D: Longitudinal direction of the balloon catheter E: Insertion direction E1: Separation direction L1: Minimum diameter of the insertion hole L2: Maximum diameter of the balloon in the expanded state X1: Shared channel X2: Branch channel for forceps X3: Branch channel for suction

Claims

1. A catheter set comprising: a balloon catheter equipped with a balloon; and an adapter having an insertion hole through which the balloon catheter can be inserted, the insertion hole communicating with the forceps channel of the endoscope, wherein the insertion hole of the adapter is capable of accommodating at least a portion of the balloon of the balloon catheter when it is withdrawn from the forceps channel of the endoscope.

2. The catheter set according to claim 1, wherein the insertion hole of the adapter is capable of accommodating the entire balloon in the longitudinal direction of the balloon catheter.

3. The catheter set according to claim 1 or 2, wherein the balloon catheter comprises a shaft for holding the balloon, and the adapter comprises an adapter body that partitions the insertion hole, and a gripping member fixed to the adapter body that can change shape between a gripping form for gripping the shaft inserted through the insertion hole and a release form that does not grip the shaft.

4. The catheter set according to claim 3, wherein the gripping member is fixed to the proximal side of the insertion hole.

5. The catheter set according to claim 3, wherein the adapter body is made of a transparent material.

6. The catheter set according to claim 3, wherein the adapter body is made of a rigid material that does not have flexibility.

7. The catheter set according to claim 3, wherein the adapter body is made of a flexible soft material.

8. The catheter set according to claim 3, wherein the adapter body comprises a plurality of wing portions that protrude in a direction perpendicular to the insertion direction in which the balloon catheter is inserted into the insertion hole.

9. The catheter set according to claim 1 or 2, wherein the adapter comprises a connecting member connectable to a forceps port of the endoscope that demarcates the proximal end of the forceps channel, and the connecting member comprises a movement restricting portion that, by engaging with the forceps port, restricts the connecting member from moving away from the forceps port of the endoscope in the insertion direction in which the balloon catheter is inserted into the insertion hole.

10. The catheter set according to claim 9, wherein the movement restricting portion is covered in the direction of separation by the flange portion of the forceps port, and the connecting member restricts movement in the direction of separation by abutting against the flange portion.

11. The catheter set according to claim 9, wherein the connecting member is provided with a rotation restricting portion that, by engaging with the forceps port, restricts the connecting member from rotating relative to the forceps port.

12. The catheter set according to claim 11, wherein the rotation restricting portion includes a stopper wall portion that abuts against the side surface of the forceps opening, thereby restricting the rotation of the connecting member relative to the forceps opening.

13. The catheter set according to claim 1 or 2, wherein the minimum diameter of the insertion hole of the adapter is smaller than the maximum diameter of the balloon in its expanded state.

Images