Flow path opening / closing device for medical tube

Abstract

To provide a flow path opening / closing device capable of accurately recognizing that a flow path part of a joint member has been shut off from a connection flow path part of a tube connection part.SOLUTION: A flow path opening / closing device 2 comprises a device body 20, a plug body 30, and a joint member 40. The device body 20 includes a tube connection part 21 having a connection flow path part 21a therein, and a main body part 22 having an accommodation hole part 23 therein. The accommodation hole part 23 communicates with the connection flow path part 21a. The plug body 30 has a through-hole part 34 formed in an axial direction and is accommodated in the accommodation hole part 23. A connection part 41 of the joint member 40 is connected to the accommodation hole part 23 accommodating the plug body 30 and is rotatable between a first rotation position and a second rotation position. A tip-side opening 43a of the joint member 40 is located at an eccentric position. When the joint member 40 is in the first rotation position, flow path parts 43, 50 of the joint member 40 are shut off from the connection flow path part 21a by the plug body 30. When the joint member is in the second rotation position, the flow path parts 43, 50 communicate with the connection flow path part 21a via the through-hole part 34.SELECTED DRAWING: Figure 6

Description

[Technical Field]

[0001] The present invention relates to a device that is connected to a medical tube and that opens and closes the flow path of the tube. [Background technology]

[0002] Catheters, for example, are medical tubes that are inserted into body cavities such as the thoracic cavity or abdominal cavity, luminal parts such as the digestive tract or urinary tract, or blood vessels, and are used to drain bodily fluids and inject medicinal fluids, contrast agents, etc. A balloon catheter, which is one type of catheter, has a balloon-shaped tip that is inflated inside blood vessels and is used for treatment and procedures.

[0003] Patent Document 1 listed below discloses a connector that is connected to the base end of a balloon catheter and closes the catheter's flow path to prevent the inflated balloon from contracting. This connector includes a connector body, a rubber member that is elastically and restorably fitted into the connector body and has a through-hole that communicates with the catheter's flow path, and a pressing member that is connected to the connector body and presses and compresses the rubber member.

[0004] In the connector of Patent Document 1, the pressing action of the pressing member compresses and deforms the rubber member, closing the through hole, and the pressing action can be released to allow the rubber member to elastically return to its original shape and open the through hole. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Utility Model Registration No. 3142630 Summary of the Invention [Problem to be solved by the invention]

[0006] In the connector of Patent Document 1, a female thread is formed on the inner peripheral surface of the connector body, and the pressing member is a screw-in member having a male thread on the outer peripheral surface that screws into the female thread of the connector body. Rotating the screw-in member presses the rubber member in the axial direction, compressing and deforming it, thereby closing the through-hole in the rubber member. Therefore, it was difficult to determine how much the pressing member needed to be rotated to close the through-hole. If the through-hole was not closed sufficiently, there was a risk that saline or other fluid injected into the balloon would leak, causing the balloon to deflate. Rotating the pressing member too far could damage the connector's components. [Means for solving the problem]

[0007] The present invention has been made to solve at least one of the above problems, and provides a flow path opening and closing device for a medical tube according to one aspect of the present invention, A. A device main body having a tube connection part formed in a hollow cylindrical shape, the interior of which serves as a connection flow path part and to which a medical tube is connected, and a main body part formed in a hollow cylindrical shape at the base end side of the tube connection part, the interior of which serves as a receiving hole part that communicates with the connection flow path part; A. A plug that is received in the receiving hole in a sealed state against the inner circumferential surface of the main body and has a through hole that penetrates from the back side to the front end face of the receiving hole in the axial direction; (c) A coupling member whose tip end is accommodated and connected in a non-detachable state to the accommodation hole in which the plug is accommodated, and which has a flow path penetrating the interior from the opening on the tip end surface to the base end, and which is rotatable between a first rotation position and a second rotation position with the tip end surface abutting against the end surface of the plug; Equipped with an opening in the tip end surface of the coupling member is located eccentrically with respect to the rotation axis of the coupling member; When the coupling member is in the first rotation position, the opening faces an end face of the plug body, and the flow path portion is blocked from the connecting flow path portion by the plug body, When the coupling member is in the second rotation position, the opening faces the passage hole portion of the plug body, and the flow path portion communicates with the connection flow path portion via the passage hole portion.

[0008] According to the above configuration, by rotating the coupling member, which is rotatable between a first rotation position and a second rotation position, from the second rotation position to the first rotation position, it is possible to accurately recognize that the flow path portion of the coupling member has been blocked from the connection flow path portion of the tube connection portion by the plug body.

[0009] Preferably, the main body portion of the device main body has a first engagement protrusion on an inner periphery, the tip end portion of the coupling member has a second engagement protrusion on an outer periphery, and when the tip end portion of the coupling member is accommodated in the accommodation hole portion of the main body portion, the second engagement protrusion engages with the first engagement protrusion on the rear side of the first engagement protrusion, When the tip end of the coupling member is accommodated in the accommodation hole of the main body portion, the second engagement protrusion can overcome the first engagement protrusion due to elastic deformation of one or both of the main body portion and the coupling member.

[0010] According to the above configuration, the structure for connecting the device body and the coupling member in a rotatable and retained state can be simplified, reducing costs. Also, the device body and the coupling member can be easily connected.

[0011] Preferably, the main body portion of the device main body has an annular wall portion that extends annularly about the rotation axis of the coupling member and forms an opening of the accommodating hole portion, the coupling member has a large diameter portion having an outer diameter larger than the inner diameter of the annular wall portion on a base end side from a tip end portion thereof, a restricting recess formed in one of the annular wall portion and the large diameter portion, the restricting recess being recessed in the rotation axis direction and extending a predetermined length in the circumferential direction, and a restricting protrusion formed in the other of the annular wall portion and the large diameter portion, the restricting protrusion protruding in the rotation axis direction and fitting into the restricting recess so as to be rotatable relative to the other in the circumferential direction, When the restricting protrusion abuts against one end face of the restricting recess, the coupling member is positioned at the first pivot position, and when the restricting protrusion abuts against the other end face, the coupling member is positioned at the second pivot position.

[0012] According to the above configuration, the user can recognize that the coupling member is in the first or second rotation position by the feel when the restricting protrusion abuts against the end face of the restricting recess, which improves the recognition that the flow path of the coupling member and the connection flow path of the tube connection member have been disconnected or connected.

[0013] Preferably, the restricting recess is provided with a first locking claw portion that locks the restricting protrusion that abuts against the one end face from the other end face side when the restricting recess is in the first pivot position, and a second locking claw portion that locks the restricting protrusion that abuts against the other end face from the one end face side when the restricting recess is in the second pivot position, When the regulating protrusion and the regulating recess rotate relative to each other in the circumferential direction, the regulating protrusion and / or the first and second locking claw portions are elastically deformed, allowing the regulating protrusion to overcome the first and second locking claw portions.

[0014] According to the above configuration, the first and second locking claws restrict rotation of the coupling member when the coupling member is in the first and second rotation positions, respectively, thereby stabilizing the state in which the flow path of the coupling member and the connection flow path of the tube connection member are disconnected or connected. In addition, the tactile response felt when the restricting protrusions climb over the first and second locking claws and the restricting protrusions and / or the first and second locking claws elastically return can further improve the recognizability of the disconnection or connection of the flow path of the coupling member and the connection flow path of the tube connection member.

[0015] Preferably, a first mark is provided on the outer periphery of the main body portion of the device main body, and a second mark is provided on the outer periphery of the coupling member, and when the coupling member is in the second rotation position, the first mark and the second mark are aligned in the axial direction. According to the above configuration, by visually checking the alignment of the first and second marks, it is possible to recognize whether the coupling member is in the second rotation position, which improves the recognizability of whether the flow path of the coupling member and the connection flow path of the tube connection member are disconnected or connected.

[0016] Preferably, a positioning recess that is recessed radially and extends axially is formed on one of the inner circumference of the main body portion of the device main body and the outer circumference of the stopper body, and a positioning protrusion that protrudes radially, extends axially, and fits into the positioning recess is provided on the other. According to the above configuration, the plug is positioned in the circumferential direction, so that the plug can be prevented from rotating together with the coupling member when the coupling member rotates. [Effects of the Invention]

[0017] According to the present invention, it is possible to accurately recognize that the flow path portion of the joint member has been cut off from the connecting flow path portion of the tube connecting portion. [Brief explanation of the drawings]

[0018] [Figure 1] 1 is a plan view showing a state in which a balloon catheter and a balloon inflation syringe are connected to a flow path opening and closing device according to an embodiment of the present invention, with the joint member in a first rotation position. [Figure 2] FIG. 4 is an exploded perspective view of the flow path opening and closing device, showing a state in which the joint member is in a second rotation position. [Figure 3] FIG. 3 is an exploded cross-sectional view taken along line III-III in FIG. 2. [Figure 4] (A) is a cross-sectional view taken along line 4A-4A in Fig. 3. (B) is a view seen from the arrow 4B in Fig. 3. (C) is a view seen from the arrow 4C in Fig. 3. (D) is a view seen from the arrow 4D in Fig. 3. [Figure 5] 5A is a view taken along the line 5B-5B in FIG. 3; (B) is a cross-sectional view taken along the line 5B-5B in FIG. 3; and (C) is a view taken along the line 5C in FIG. [Figure 6]6A-6C are diagrams showing the state in which the flow path opening and closing device is in use, with the coupling member in the first rotation position and the flow path portion of the coupling member blocked from the connecting flow path portion of the device main body by the stopper body, where (A) is a cross-sectional view taken along line 6A-6A in FIG. 1, (B) is a cross-sectional view taken along line BB in FIG. 6A, and (C) is a cross-sectional view taken along line CC in FIG. 6A. [Figure 7] 7A and 7B are diagrams showing the state in which the flow path opening and closing device is in use, showing a state in which the coupling member is in the second rotation position and the flow path portion of the coupling member is connected to the connection flow path portion of the device main body via the passage hole portion of the stopper body, (A) is a cross-sectional view of the coupling member rotated 90° counterclockwise from the state in FIG. 6A as viewed from the axial syringe side, (B) is a cross-sectional view along line BB in FIG. 7A, and (C) is a cross-sectional view along line CC in FIG. 7A. [Figure 8] 8(A) and 8(B) are diagrams showing the flow path opening and closing device in use, showing the state in which the balloon portion of the balloon catheter is inflated, the coupling member is returned to the first rotation position, and the syringe is removed. (A) is a cross-sectional view of the coupling member rotated 90° clockwise from the state in FIG. 7(A) as viewed from the syringe side in the axial direction. (B) is a cross-sectional view along line BB in FIG. 8(A). (C) is a cross-sectional view along line CC in FIG. 8(A). [Figure 9] 9(A) and 9(B) are cross-sectional views showing the state in which the flow path opening and closing device is in use, with the coupling member again in the second rotation position and the catheter balloon in a deflated state, in which (A) is a cross-sectional view of the coupling member rotated 90° counterclockwise from the state in FIG. 8(A) as viewed from the syringe side in the axial direction, (B) is a cross-sectional view taken along line BB in FIG. 9(A), and (C) is a cross-sectional view taken along line CC in FIG. 9(A). DETAILED DESCRIPTION OF THE INVENTION

[0019] An embodiment of the present invention will be described below with reference to Figures 1 to 9. In this embodiment, the present invention is applied to a flow path opening and closing device connected to a balloon catheter having a balloon-shaped tip as a medical tube. In the following description, the left side in FIG. 1 means the distal end side, and the right side means the proximal end side.

[0020] As shown in FIG. 1, a flow path opening and closing device 2 is connected to the base end of a balloon catheter 1 (medical tube), and a syringe 3 for expanding the balloon is connected to the base end of the flow path opening and closing device 2.

[0021] <Devices connected to flow path opening and closing device 2> The balloon catheter 1 has a tube portion 1a and a balloon portion 1c provided at the tip of the tube portion 1a. A flow path 1b inside the tube portion 1a is connected to the inside of the balloon portion 1c. The tube portion 1a is made of synthetic resin and is flexible. The balloon portion 1c is made of synthetic resin and is stretchable.

[0022] 6(A), the balloon inflation syringe 3 has a cylindrical tip 3T connected to the flow path opening and closing device 2, and this cylindrical tip 3T has a male luer portion 3a and a threaded portion 3b that is coaxial with the male luer portion 3a and is disposed radially outward of the male luer portion 3a. The outer surface of the male luer portion 3a is gently tapered, with the diameter decreasing toward the tip, and a female thread 3c is formed on the inner periphery of the threaded portion 3b.

[0023] <Components of the flow path opening and closing device 2> As shown in FIGS. 2 and 3, the flow path opening and closing device 2 includes a device body 20, a plug body 30, and a joint member 40. The device main body 20 can be made of an elastically deformable synthetic resin, and has a tube connection section 21 on the distal end side and a main body section 22 on the proximal end side. The tube connection section 21 is formed in a hollow cylindrical shape, and its interior forms a connection flow path section 21a, which extends to the interior of the main body section 22. The proximal end of the tube section 1a is connected to the tube connection section 21, and the connection flow path section 21a communicates with the flow path 1b of the tube section 1a.

[0024] The main body 22 is hollow, and the interior of the main body 22 forms a cylindrical accommodation hole 23 with a bottom for accommodating the plug 30 and the tip end of the coupling member 40. The accommodation hole 23 communicates with the connection flow path 21a via an opening 21b formed on the inner surface of the bottom 24 of the main body 22. The opening 21b is disposed at a position eccentric to the axis of the accommodation hole 23.

[0025] 3 and 4(B), a positioning recess 25 used to position the plug 30 is formed on the inner periphery of the main body 22, midway in the axial direction of the receiving hole 23. In this embodiment, two (plural) positioning recesses 25 are formed spaced apart in the circumferential direction and opposed to each other in the radial direction. Each positioning recess 25 is recessed in the radial direction of the receiving hole 23 and extends in the axial direction.

[0026] As shown in Fig. 3, the main body 22 of the device main body 20 has, at its base end side, an annular wall 26 that extends annularly around the axis of the accommodating hole 23 and forms the opening 23a of the accommodating hole 23. As shown in Figs. 3 and 4(A) and (B), three (plural) engagement protrusions 27 (first engagement protrusions) that are spaced apart in the circumferential direction and protrude radially inward are provided on the inner periphery of the base end edge of the annular wall 26. Each engagement protrusion 27 has an engagement surface 27a that is perpendicular to the axis on the back side of the accommodating hole 23, and a guide surface 27b on the front side that is inclined radially inward as it extends toward the back.

[0027] A restricting protrusion 28 that protrudes in the axial direction of the receiving hole 23 is provided on the base end surface of the annular wall 26 . A mark 29 (first mark) that protrudes radially and extends axially is provided on the outer periphery of the main body 22 on the tip side of the annular wall 26. The mark 29 is used to check the open / closed state of the flow path opening / closing device 2, as will be described later, and in this embodiment, two (plural) marks 29 are formed spaced apart in the circumferential direction and arranged to face each other in the radial direction.

[0028] 2, 3, 4(C) and 4(D), the plug 30 is formed in a cylindrical shape from an elastic material such as rubber, and is elastically expandable and contractible in diameter, so that it can be press-fitted into the inner part of the receiving hole 23 of the device body 20 with its axis aligned. A radially protruding annular flange 31 is provided at the tip of the plug 30, and the outer diameter of the flange 31 is larger than the inner diameter of the receiving hole 23.

[0029] A passage hole 34 is formed in the plug 30 at a position eccentric to its axis, penetrating from a distal end (rear end) end face 32 to a proximal end (near end) end face 33. A positioning protrusion 35 that protrudes radially and extends axially is provided on the proximal end side of the outer periphery of the plug 30. In this embodiment, two (plural) positioning protrusions 35 are formed circumferentially spaced apart and facing each other radially. When the plug 30 is accommodated in the accommodation hole 23, these positioning protrusions 35, 35 fit into the positioning recesses 25, 25 of the main body 22, thereby positioning the plug 30 in the circumferential direction.

[0030] The joint member 40 is used to connect the device main body 20 and the balloon inflation syringe 3, and is formed in a tubular shape. The coupling member 40 can be made of an elastically deformable synthetic resin, and as shown in Figures 2, 3, and 5, has a cylindrical connecting portion 41 at its tip that is received in the receiving hole 23 of the device body 20. A circular engaging protrusion 42 (second engaging protrusion) is provided on the outer periphery of the connecting portion 41. The engaging protrusion 42 has an engaging surface 42a at the base end of the connecting portion 41 that is perpendicular to the axis, and a guide surface 42b at the tip end of the connecting portion 41 that is inclined radially inward as it extends toward the tip end.

[0031] The joint member 40 is formed with a tip-side flow passage portion 43 that extends from the tip surface 41a of the connection portion 41 to the middle of the joint member 40. A tip-side opening 43a of the tip-side flow passage portion 43 formed on the tip surface 41a is disposed at a position eccentric to the axis of the connection portion 41.

[0032] The coupling member 40 is provided with a large diameter portion 44 on the base end side of the connecting portion 41, the large diameter portion 44 having an outer diameter larger than the outer diameter of the connecting portion 41 and the inner diameter of the annular wall portion 26 of the device body 20. A restricting recess 45 is formed at the tip end of the large diameter portion 44. The restricting recess 45 is recessed in the axial direction of the connecting portion 41 toward the base end side of the coupling member 40 and extends a predetermined length in the circumferential direction. In this embodiment, the circumferential length of the restricting recess 45 is set to be slightly longer than one-fourth of the entire circumferential length of the tip end of the large diameter portion 44.

[0033] The restricting recess 45 is provided with a locking claw portion 46 (first locking claw portion) facing the circumferential end face 45a at a position spaced apart in the circumferential direction from one circumferential end face 45a, and a locking claw portion 47 (second locking claw portion) facing the circumferential end face 45b at a position spaced apart in the circumferential direction from the other circumferential end face 45b. The locking claw portions 46, 47 protrude from a bottom surface 45c of the restricting recess 45. The radially outer surfaces of the locking claw portions 46, 47 of the large diameter portion 44 form guide surfaces 46a, 47a that are inclined radially outward as they approach the opposing circumferential end faces 45a, 45b, respectively.

[0034] A mark 48 (second mark) that protrudes radially and extends axially is provided on the outer periphery of the large diameter portion 44. In this embodiment, two (plural) marks 48 are formed spaced apart in the circumferential direction and arranged to face each other in the radial direction. As will be described later, the mark 48, together with the mark 29 on the device main body 20, is used to visually confirm the open / closed state of the flow path opening and closing device 2. The mark 48 also functions as an operating part for rotating the joint member 40.

[0035] The coupling member 40 has a female luer part 49 at its proximal end as a connecting part for connecting the balloon inflation syringe 3. The female luer part 49 has an elongated cylindrical shape, and a pair of protrusions 49a that function as male screws are formed on the outer periphery of the proximal end, spaced 180° apart in the circumferential direction. As shown in Fig. 7(A), the protrusions 49a can be threaded into the female threads 3c of the threaded part 3b of the balloon inflation syringe 3.

[0036] 3, the interior of the female luer part 49 forms part of the base-side flow path part 50 of the coupling member 40, and the base-side flow path part 50 extends to the middle of the coupling member 40. The inner surface of the female luer part 49 that forms the base side of the base-side flow path part 50 extends beyond the female luer part 49 toward the tip side, forming a gently tapered part 51 whose diameter gradually decreases from the base end to the tip end of the coupling member 40. The taper angle of the gently tapered part 51 is substantially equal to the taper angle of the outer surface of the male luer part 3a of the balloon inflation syringe 3.

[0037] A steep taper section 52 is formed on the tip side of the gentle taper section 51, constituting the tip side of the base-end side flow path section 50 and having a diameter that becomes smaller at a steeper rate than the gentle taper section 51. A base-end side opening 43b of the tip-end side flow path section 43 is formed in the steep taper section 52. This allows the tip-end side flow path section 43 and the base-end side flow path section 50 to communicate with each other and form a flow path section of the joint member 40.

[0038] <Assembly of flow path opening and closing device 2> As shown in FIG. 2, the device main body 20 and the plug 30 are arranged approximately coaxially with the receiving hole 23 and the distal end face 32 of the plug 30 facing each other, and the connection flow path 21a of the tube connection portion 21 is roughly aligned with the passage hole 34 of the plug 30. In this state, the plug 30 is press-fitted into the receiving hole 23, and the positioning protrusions 35, 35 of the plug 30 are fitted into the positioning recesses 25, 25 of the main body 22. This positions the plug 30 circumferentially, so that the opening 21b of the connection flow path 21a on the inner surface of the bottom 24 of the main body 22 faces the passage hole 34. At this time, at least the flange 31 of the plug 30 and the inner circumferential surface of the main body 22 are sealed.

[0039] Next, the device main body 20 and the coupling member 40, which accommodate the plug 30, are positioned approximately coaxially with the accommodation hole 23 and the connection portion 41 facing each other, and the connection flow path portion 21a of the tube connection portion 21 is roughly aligned with the tip-side opening 43a of the coupling member 40. When the device main body 20 and the coupling member 40 are brought closer together in this state, the connection portion 41 enters the accommodation hole 23, and the guide surface 27b of the engagement protrusion 27 of the device main body 22 comes into contact with the guide surface 42b of the engagement protrusion 42 of the connection portion 41. When the device main body 20 and the coupling member 40 are brought closer together, one or both of the device main body 22 and the coupling member 40 elastically deform, mainly the device main body 22 elastically deforming and expanding in diameter, and then elastically returning to their original position when the engagement protrusion 42 overcomes the engagement protrusion 27. This allows the device main body 20 and the coupling member 40 to be easily connected.

[0040] In this way, the main body 22 of the device main body 20 and the connecting part 41 of the coupling member 40 are connected by a so-called snap fit to be rotatable relative to each other, and the axis of rotation coincides with the axes of the accommodation hole 23 and the connecting part 41. At this time, as shown in Figure 7(A), the engaging surface 42a of the engaging protrusion 42 of the connecting part 41 engages with the engaging surface 27a of the engaging protrusion 27 of the main body 22, preventing the connecting part 41 from coming off. Therefore, with a simple structure, the device main body 20 and the coupling member 40 can be connected in a rotatable and non-detachable state, and manufacturing costs can be reduced.

[0041] At this time, the restricting protrusion 28 of the device body 20 is inserted between the circumferential end face 45b of the restricting recess 45 of the coupling member 40 and the locking claw 47. The tip end face 41a of the connection part 41 is pressed against the base end face 33 of the plug 30, and the tip end opening 43a of the tip end flow path part 43 formed on the tip end face 41a faces the passage hole 34.

[0042] In this manner, when the distal-side flow path portion 43 and the proximal-side flow path portion 50, which are flow path portions of the coupling member 40, are in communication with the connection flow path portion 21a of the device body 20 via the passage hole portion 23 of the plug 30 (FIG. 7(A)), the coupling member 40 is in the second rotation position. At this time, the mark 29 of the device body 20 and the mark 48 of the coupling member 40 are aligned linearly in the axial direction. This makes it possible to visually confirm that the coupling member 40 is in the second rotation position and that the flow path opening and closing device 2 is in the open state.

[0043] <Operation of flow path opening / closing device 2> When the coupling member 40 is in the second rotation position, if the coupling member 40 is rotated counterclockwise as viewed from the axial base end side (syringe 3 side), as shown in FIG. 7(B), the restricting protrusion 28 abuts against the circumferential end surface 45b of the restricting recess 45, preventing rotation. However, if the coupling member 40 is rotated clockwise, the restricting protrusion 28 is engaged with the locking claw 47, but one or both of the restricting protrusion 28 and the locking claw 47 elastically deform, allowing the restricting protrusion 28 to climb over the locking claw 47 and then elastically return to its original position. When the coupling member 40 is further rotated clockwise, the restricting protrusion 28 is guided by the guide surface 46a of the locking claw 46, and the elastic deformation of one or both of the restricting protrusion 28 and the locking claw 46 allows the restricting protrusion 28 to climb over the locking claw 46, and as shown in FIG. 6(B), the restricting protrusion 28 abuts against the circumferential end surface 45a when rotated 90°.

[0044] At this time, as shown in FIG. 6(A), the tip-side opening 43a of the tip-side flow path portion 43 of the coupling member 40 faces the base-side end face 33 of the plug 30, and the tip-side flow path portion 43 and the base-side flow path portion 50 are blocked from the connection flow path portion 21a of the device main body 20 by the plug 30. In this state, the coupling member 40 is in the first rotation position. At this time, as shown in FIG. 1, the mark 29 of the device main body 20 and the mark 48 of the coupling member 40 are arranged circumferentially offset by 90°. This makes it possible to visually confirm that the coupling member 40 is in the first rotation position and that the flow path opening and closing device 2 is in the closed state.

[0045] When the coupling member 40 is in the first rotation position, if the coupling member 40 is rotated clockwise as viewed from the axial base end side (syringe 3 side), the restricting protrusion 28 abuts against the circumferential end surface 45a of the restricting recess 45, preventing rotation, as shown in FIG. 6(B). However, if the coupling member 40 is rotated counterclockwise, the restricting protrusion 28 is engaged with the locking claw 46, but one or both of the restricting protrusion 28 and the locking claw 46 elastically deform, allowing the restricting protrusion 28 to climb over the locking claw 46 and then elastically return to its original position. If the coupling member 40 is further rotated counterclockwise, the restricting protrusion 28 is guided by the guide surface 47a of the locking claw 47, and the elastic deformation of one or both of the restricting protrusion 28 and the locking claw 47 allows the restricting protrusion 28 to climb over the locking claw 47, and as shown in FIG. 7(B), the restricting protrusion 28 abuts against the circumferential end surface 45b when rotated 90°.

[0046] When rotating the coupling member 40 between the first rotation position and the second rotation position, the operator can feel a tactile response when the restricting protrusions 28 climb over the locking claws 46, 47 or when they abut against the circumferential end faces 45a, 45b. This improves the operator's awareness of whether the distal-end side flow path portion 43 and the proximal-end side flow path portion 50 of the coupling member 40 have been disconnected from or connected to the connection flow path portion 21a of the device main body 20. This prevents the operator from rotating the coupling member 40 excessively, thereby preventing damage to the components of the flow path opening and closing device 2. Furthermore, when the joint member 40 is rotated, the plug 30 against which the connecting portion 41 of the joint member 40 is pressed is positioned in the circumferential direction, and therefore can be prevented from rotating together.

[0047] When the coupling member 40 is in the first rotation position (FIG. 6(B)), the restricting protrusions 28 are locked by the locking protrusions 46 from the side opposite the circumferential end face 45a, and when the coupling member 40 is in the second rotation position (FIG. 7(B)), the restricting protrusions 28 are locked by the locking claws 47 from the side opposite the circumferential end face 45b, thereby restricting the rotation of the coupling member 40. This makes it possible to stabilize the state in which the distal-side flow path portion 43 and the proximal-side flow path portion 50 of the coupling member 40 are disconnected from or connected to the connection flow path portion 21a of the device main body 20.

[0048] <Example of use of flow path opening and closing device 2> A case where a balloon catheter 1 is inserted into a blood vessel and a surgery is performed while the balloon portion 1c is kept inflated by the flow path opening and closing device 2 will be described with reference to FIG. 1 and FIGS. First, as shown in Figures 1 and 6, the base end of the tube portion 1a of the balloon catheter 1 is connected to the tube connection portion 21 of the flow path opening and closing device 2, and the balloon portion 1c of the balloon catheter 1 is inserted into the target site of the blood vessel. The cylindrical tip portion 3T of the balloon inflation syringe 3 containing physiological saline for balloon inflation is connected to the female luer portion 49 of the flow path opening and closing device 2. At this time, the male luer portion 3a is press-fitted into the gentle taper portion 51 by threading the protrusion 49a of the female luer portion 49 into the female thread portion 3c of the cylindrical tip portion 3T.

[0049] As shown in Fig. 7, after the joint member 40 is set to the second rotation position to open the flow path opening and closing device 2, physiological saline is injected from the balloon inflation syringe 3. The physiological saline passes through the base-end side flow path portion 50 and the tip-end side flow path portion 43 of the joint member, the through-hole portion 34 of the stopper body 30, the connection flow path portion 21a of the device main body 20, and the flow path 1b of the tube portion 1a, and is injected into the balloon portion 1c. The balloon portion 1c is inflated to block the blood vessel.

[0050] As shown in Figure 8, in order to maintain the balloon portion 1c in an inflated state, the joint member 40 is rotated from the second rotation position to the first rotation position, and the flow path opening and closing device 2 is placed in a closed state. At this time, the distal flow path portion 43 of the joint member 40 is blocked by the proximal end face 33 of the stopper body 30, and the passage hole portion 34 of the stopper body 30 is blocked by the distal end face 41a of the connection portion 41. This blocks the injection of saline from the balloon inflation syringe 3 and the backflow of saline from the balloon portion 1c. The balloon inflation syringe 3 is then removed from the joint member 40, and surgery is performed.

[0051] Since the joint member 40 in the first rotation position is restricted from rotating, it is possible to stabilize the flow path opening and closing device 2 in the closed state. This makes it possible to avoid a situation in which the joint member 40 rotates to establish a communicating state, causing the saline solution injected into the balloon portion 1c to leak and the balloon portion 1c to deflate.

[0052] When the occlusion of the blood vessel by the balloon portion 1c is to be completed, the joint member 40 is rotated to the second rotation position to open the flow path opening and closing device 2, as shown in Fig. 9. At this time, the saline in the balloon portion 1c flows in the opposite direction to that during injection, and the balloon portion 1c contracts.

[0053] According to the above embodiment, by rotating the joint member 40 from the second rotation position to the first rotation position, it is possible to accurately recognize that the flow path portion of the joint member 40 has been blocked from the connection flow path portion 21a of the tube connection portion 21 by the plug 30. Furthermore, the flow path opening and closing device 2 can be switched between the open state and the closed state with a smaller rotation amount of the joint member 40 than in the conventional device.

[0054] The present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the spirit of the present invention. In the above embodiment, the restricting protrusion 28 is provided on the base end side of the annular wall portion 26 of the device main body 20, and the restricting recess 45 is formed on the tip end side of the large diameter portion 44 of the coupling member 40. However, it is also possible to form a restricting recess on the base end side of the annular wall portion 26, and provide a restricting protrusion on the tip end side of the large diameter portion 44. In the above embodiment, a positioning recess 25 is formed on the inner circumference of the main body portion 22 of the device main body 20, and a positioning protrusion 35 is provided on the outer circumference of the plug main body 30, but it is also possible to provide a positioning protrusion on the inner circumference of the main body portion 22 and form a positioning recess on the outer circumference of the plug main body 30. In the above embodiment, the rotation angle between the first rotation position and the second rotation position is 90°, but it may be 180° or another angle. The medical tube may be not only a tube inserted into a blood vessel, but also a tube inserted into a body cavity such as the thoracic cavity or abdominal cavity, or a lumen such as the digestive tract or urinary tract. The medical tube may be not only a tube for passing physiological saline, but also a tube used for draining bodily fluids or for injecting medicinal fluids, contrast media, etc. The medical tube may be a tube that allows not only liquid to pass through but also gas to pass through. [Industrial Applicability]

[0055] The present invention relates to a device that is connected to a medical tube and that opens and closes the flow path of the tube. [Explanation of symbols]

[0056] 1: balloon catheter, 1a: tube portion, 1b: flow path, 1c: balloon portion, 2: Flow path opening and closing device, 3: balloon inflation syringe, 3T: Tip portion, 3a: Male luer portion, 3b: Threaded portion, 3c: Female thread portion, 20: device body, 21: Tube connection portion; 21a: Connection flow path portion; 21b: Opening of connection flow path portion; 22: Main body portion; 23: Storage hole portion; 23a: Opening of storage hole portion; 24: Bottom portion; 25: Positioning recess portion; 26: Annular wall portion; 27: Engagement protrusion (first engagement protrusion); 27a: Engagement surface; 27b: Guide surface; 28: Restriction protrusion portion; 29: Mark (first mark) 30: plug body, 31: flange portion, 32: distal end (rear side) end face, 33: proximal end (near side) end face, 34: passage hole portion, 35: positioning protrusion portion, 40: coupling member, 41: connection portion, 41a: tip surface of connection portion, 42: engagement protrusion (second engagement protrusion), 42a: engagement surface, 42b: guide surface, 43: tip side flow passage portion (flow passage portion), 43a: tip side opening of tip side flow passage portion, 43b: base side opening of tip side flow passage portion, 44: large diameter portion, 45: restriction recess, 45a: circumferential end surface, 45b: circumferential end surface, 46: locking claw portion (first locking claw portion), 46a: guide surface, 47: locking claw portion (second locking claw portion), 47a: guide surface, 48: mark (second mark), 49: female luer portion, 49a: protrusion, 50: base side flow passage portion (flow passage portion), 51: gradual taper portion, 52: steep taper portion

Claims

1. A flow path opening and closing device for a medical tube, A. A device main body including a tube connection part formed in a hollow cylindrical shape, the interior of which serves as a connection flow path part and to which a medical tube is connected, and a main body part formed in a hollow cylindrical shape at the proximal end of the tube connection part, the interior of which serves as a receiving hole part that communicates with the connection flow path part; A. A plug that is received in the receiving hole in a sealed state against the inner circumferential surface of the main body and has a passage hole that penetrates from the back end to the front end face of the receiving hole in the axial direction; C. A coupling member whose tip end is accommodated and connected in a locked state to the accommodation hole in which the plug is accommodated, which has a flow path penetrating the interior from the opening on the tip end surface to the base end, and which is rotatable between a first rotation position and a second rotation position with the tip end surface abutting against the end surface of the plug; Equipped with an opening in the tip end surface of the coupling member is located eccentrically with respect to the rotation axis of the coupling member; When the coupling member is in the first rotation position, the opening faces an end face of the plug body, and the flow path portion is blocked from the connecting flow path portion by the plug body, A flow path opening and closing device for a medical tube, characterized in that when the coupling member is in the second rotation position, the opening faces the through hole portion of the stopper body and the flow path portion communicates with the connecting flow path portion via the through hole portion.

2. the main body portion of the device main body has a first engagement protrusion on its inner periphery, the tip end portion of the coupling member has a second engagement protrusion on its outer periphery, and when the tip end portion of the coupling member is accommodated in the accommodation hole portion of the main body portion, the second engagement protrusion engages with the first engagement protrusion on the rear side of the first engagement protrusion, 2. The medical tubing flow path opening and closing device according to claim 1, characterized in that when the tip end of the coupling member is accommodated in the accommodation hole of the main body portion, the second engaging protrusion can overcome the first engaging protrusion due to elastic deformation of one or both of the main body portion and the coupling member.

3. a main body portion of the device main body having an annular wall portion that extends annularly about the rotation axis of the coupling member and forms an opening of the accommodating hole portion, the coupling member has a large diameter portion having an outer diameter larger than the inner diameter of the annular wall portion on a base end side from a tip end portion thereof, a restricting recess formed in one of the annular wall portion and the large diameter portion, the restricting recess being recessed in the rotation axis direction and extending a predetermined length in the circumferential direction, and a restricting protrusion formed in the other of the annular wall portion and the large diameter portion, the restricting protrusion protruding in the rotation axis direction and fitting into the restricting recess so as to be rotatable relative to the other in the circumferential direction, 3. The flow path opening and closing device for a medical tube according to claim 1, wherein when the regulating convex portion abuts against one end face of the regulating concave portion, the coupling member is positioned at the first pivot position, and when the regulating convex portion abuts against the other end face, the coupling member is positioned at the second pivot position.

4. The restricting recess is provided with a first locking claw portion that locks the restricting protrusion that abuts against the one end face from the other end face side when the restricting recess is in the first pivot position, and a second locking claw portion that locks the restricting protrusion that abuts against the other end face from the one end face side when the restricting recess is in the second pivot position, A flow path opening and closing device for a medical tube as described in claim 3, characterized in that when the regulating protrusion and the regulating recess rotate relative to each other in the circumferential direction, the regulating protrusion and / or the first and second locking claw portions are elastically deformed to allow the regulating protrusion to overcome the first and second locking claw portions.

5. 3. The medical tubing flow path opening and closing device according to claim 1, wherein a first mark is provided on the outer periphery of the main body portion of the device body, a second mark is provided on the outer periphery of the coupling member, and when the coupling member is in the second rotation position, the first mark and the second mark are aligned in the axial direction.

6. 3. A flow path opening and closing device for a medical tube as described in claim 1 or 2, characterized in that a positioning recess that is recessed radially and extends axially is provided on one of the inner circumference of the main body portion of the device main body and the outer circumference of the stopper body, and a positioning protrusion that protrudes radially, extends axially, and fits into the positioning recess on the other.

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