JP2017148477A - Medical connector - Google Patents

Abstract

PROBLEM TO BE SOLVED: To achieve a medical connector which suppresses a load on a bulge part in passing over the bulge part and hardly causes the detachment of connectors from each other after fastening a lock nut.SOLUTION: A medical connector comprises a plug 101 and a lock nut 102. The lock nut 102 includes a flexible piece 121 and a space 124 allowing the flexible piece 121 to be elastically deformed. The flexible piece 121 includes a protrusion 122 protruding in an inward direction. The flexible piece 121 is deformed to the side of an inner wall of the lock nut 102 when the protrusion 122 abuts on a plug side engaging part 114 including a projection part 112 provided on the plug 101, and one of the flexible piece 121 and the projection part 112 is annularly provided.SELECTED DRAWING: Figure 1

Description

  The present disclosure relates to a medical connector, and more particularly, to a lock connector having a lock nut.

  Various medical devices such as a syringe, a catheter and a tube are connected by a luer connector. The luer connector is roughly divided into a slip connector and a lock connector. The slip connector is engaged by friction between the outer peripheral surface of the male connector inserted into the female connector and the inner peripheral surface of the female connector. The lock connector is provided with a lock nut whose inner surface is threaded around the plug of the male connector, and a thread that engages with the screw of the lock nut is provided on the outer peripheral surface of the female connector. The connection reliability can be improved by engaging and locking the lock nut of the male connector with the thread of the female connector or the like.

  However, the lock nut may rotate unintentionally. In this case, there is a possibility that the seal between the connectors is incomplete and liquid leakage occurs, or in the worst case, the connector comes off. For this reason, it has been studied to prevent the connectors from being detached from each other due to unintended rotation of the lock nut (see, for example, Patent Document 1). Specifically, the engagement portion composed of the annular rib provided at the base end portion of the lock nut and the raised portion provided on the surface of the plug is engaged, and the state before the lock nut is tightened is returned. Is preventing.

US Pat. No. 6,843,513

  However, in the conventional connector, since the base end of the lock nut provided with the annular rib is thick and difficult to deform, there is no pressure escape when engaging the annular rib and the raised portion, There is a possibility that the mountain of the raised portion may be crushed, and connection reliability cannot be sufficiently secured.

  The subject of this indication is reducing the burden added to an engaging part when tightening a lock nut, and enabling it to implement | achieve a highly reliable medical connector.

  One aspect of the medical connector includes a plug extending from the proximal end side to the distal end side, and a lock nut attached around the plug so as to be rotatable and movable in the axial direction, and the lock nut projects on the inner surface thereof. And a space that is provided between the flexible piece and the inner wall of the lock nut and allows the flexible piece to elastically deform. The flexible piece has a protrusion protruding inwardly. And the plug has a plug-side engaging portion including a convex portion provided on the outer peripheral surface of the base portion, and the flexible piece is formed on the inner wall side of the lock nut by the projection abutting on the convex portion. At least one of the deformed flexible piece provided on the lock nut and the convex part provided on the plug is provided in an annular shape.

One aspect of the medical connector is provided between a flexible piece projecting on the inner surface of the lock nut, the flexible piece, and the inner wall of the lock nut, and has a space that allows the flexible piece to elastically deform, The flexible piece is deformed to the inner wall side of the lock nut when the protrusion comes into contact with the convex portion. For this reason, the force applied to the plug-side engaging portion can be released, and the load applied to the plug-side engaging portion can be suppressed. In addition, since at least one of the flexible piece provided on the lock nut and the convex portion of the plug-side engaging portion is provided in an annular shape, the positional relationship between the protrusion and the convex portion is maintained. , It is possible to prevent the protrusion from passing through the convex portion .

  In one aspect of the medical connector, the plug-side engaging portion includes a first convex portion, a second convex portion provided on a proximal end side with respect to the first convex portion, a first convex portion, and a second convex portion. The height of the second convex portion from the bottom surface of the concave portion is lower than the height from the bottom surface of the concave portion of the first convex portion, and the flexible piece has a protrusion on the base end side. When moving over the second convex portion from the tip toward the distal end side, it deforms to the inner wall side of the lock nut, and when the protrusion climbs over the second convex portion, the flexible piece deforms to the opposite side of the inner wall of the lock nut. You can

  The flexible piece is deformed toward the inner wall side of the lock nut when the protrusion gets over the second convex part, and the flexible piece is connected to the inner wall of the lock nut when the protrusion gets over the second convex part and reaches the concave part. By adopting a configuration that deforms to the opposite side, the protrusion can easily get over the second convex portion. Accordingly, it is possible to suppress a load applied to the second convex portion when the projection gets over the second convex portion. In addition, if the lock nut rotates unintentionally after the lock nut is tightened, the second protrusion and the protrusion come into contact with each other before the female connector is detached, and the movement of the lock nut can be restricted. The connectors can be made difficult to separate.

  In one aspect of the medical connector, the second convex portion may be a slope whose proximal end protrudes toward the distal end of the plug. By adopting such a configuration, such a configuration makes it easier for the protrusion to get over the second convex portion when the lock nut is tightened, and to increase the click feeling when the lock nut is tightened. Can do.

  In one aspect of the medical connector, the second convex portion is inclined on the distal end side and the proximal end side, and the inclination angle of the inclined surface on the distal end side may be larger than the inclination angle of the inclined surface on the proximal end side. . With such a configuration, when the lock nut is tightened and loosened, the protrusion can easily get over the second protrusion, and the lock nut can be made difficult to loosen.

  In one aspect of the medical connector, the inclination angle of the inclined surface on the proximal end side of the protrusion and the inclination angle of the inclined surface on the distal end side of the second convex portion may coincide with each other. By doing so, the fitting force when the lock nut is tightened is improved, and when the lock nut is loosened, the protrusion can easily get over the second convex portion on the base end side.

  In one aspect of the medical connector, when the protrusion is positioned between the first protrusion and the second protrusion, the protrusion can be prevented from coming into contact with the bottom surface of the recess. By setting it as such a structure, since a lock nut rotates idly, a lock nut can be tightened easily.

  In one aspect of the medical connector, when the protrusion is positioned between the first protrusion and the second protrusion, the second protrusion is in contact with the flexible piece, and between the first protrusion and the second protrusion. The protrusion can be clamped with. By setting it as such a structure, the fitting force at the time of tightening a lock nut improves.

  In one aspect of the medical connector, the first convex portion may be a surface whose proximal end side is orthogonal to the axis of the plug, and the protrusion may have a surface orthogonal to the axis of the plug on the distal end side. With such a configuration, it is possible to make it difficult for the protrusion to get over the first convex portion. Further, the protrusion has a surface orthogonal to the axis of the plug on the distal end side and an inclined surface, the inclined surface abuts on the second convex portion, and the inclination angle of the inclined surface is on the proximal end side of the second convex portion. The slope and the inclination angle may substantially coincide with each other. If it does in this way, it can make it difficult for a projection to get over a 1st convex part, and to get over a 2nd convex part.

  In one aspect of the medical connector, the flexible piece protrudes in the distal direction from the proximal end of the lock nut on the inner surface of the lock nut, and the interval between the flexible piece and the inner wall of the lock nut is larger at the distal end side than at the proximal end side. it can. With such a configuration, it is possible to secure a degree of freedom when the protrusion is deformed in a direction intersecting the axis. Further, since the distance between the proximal ends of the flexible pieces is large, it is less likely to be deformed than the distal end side, and even when the lock nut is pulled toward the distal end side when the projection comes into contact with the first convex portion, it comes out. Can be difficult.

  In one aspect of the medical connector, the flexible piece has a tapered portion that gradually decreases in thickness toward the distal end side from the protrusion, and the tapered surface of the tapered portion faces the outer peripheral surface of the plug. You may do it. By setting it as such a structure, the freedom degree of a deformation | transformation of a flexible piece can be enlarged.

  In one aspect of the medical connector, the flexible piece may be annular. By setting it as such a structure, it becomes easy to hold | maintain a flexible piece between a 1st convex part and a 2nd convex part, and can make a lock nut hard to loosen.

  In one aspect of the medical connector, the first convex portion and the second convex portion can be annular. With such a configuration, it is possible to make it difficult for the lock nut to come off in the distal direction.

  In one aspect of the medical connector, the convex portion is a slope whose base end side is raised toward the distal direction of the plug, and the projection has a slope corresponding to the slope of the convex portion on the distal side, the slope of the projection, It is good also as a structure which mutually contact | abuts with the slope of a convex part, and is frictionally engaged. By adopting such a configuration, since the surfaces are frictionally engaged, the lock nut can be made more difficult to loosen than in the case where the protrusion and the convex portion are in point contact.

  According to the medical connector of the present disclosure, it is possible to reduce a load applied to the engaging portion when tightening the lock nut, and it is possible to improve reliability.

It is sectional drawing which shows the medical connector which concerns on 1st Embodiment. It is sectional drawing which expands and shows the II part of FIG. It is sectional drawing which shows the state which tightened the lock nut. It is sectional drawing which shows the modification of a projection part. It is sectional drawing which shows the modification of a projection part. It is sectional drawing which shows the modification of a projection part. It is sectional drawing which shows the medical connector which concerns on 2nd Embodiment. It is sectional drawing which shows the state which tightened the lock nut in the medical connector of 2nd Embodiment.

  The medical connector according to the first embodiment, as shown in FIGS. 1 to 3, is attached to a plug 101 extending from the proximal end side to the distal end side so as to be rotatable around the plug 101 and movable in the axial direction. The male luer connector is provided with a lock nut 102.

  The lock nut 102 has a flexible piece 121 protruding on the inner surface thereof, and a space 124 provided between the flexible piece 121 and the inner wall of the lock nut 102 and allowing the flexible piece 121 to elastically deform. The flexible piece 121 has a protrusion 122 protruding inward. The plug 101 includes a first convex portion 111 provided on the outer peripheral surface of the base portion, a second convex portion 112 provided on the base end side of the first convex portion 111, the first convex portion 111, and the second convex portion. A plug-side engagement portion 114 including a recess 113 provided between the portion 112 and the portion 112 is provided. The height h2 from the bottom surface of the concave portion 113 of the second convex portion 112 is lower than the height h1 from the bottom surface of the concave portion 113 of the first convex portion 111. The protrusion 122 abuts on the second convex portion 112 and can get over the second convex portion 112.

  The connector of this embodiment can be connected by inserting the plug 101 into a female connector having a male screw corresponding to the lock nut 102. Specifically, with the lock nut 102 moved to the proximal end side, the plug 101 is inserted into the female connector, and the lock nut 102 is rotated in a predetermined direction. The lock nut 102 can be tightened by meshing with the male screw. By tightening the lock nut 102, the lock nut 102 gradually moves to the tip (female connector) side. Thereby, the inner side surface of the protrusion 122 of the lock nut 102 abuts on the second convex portion 112, and the flexible piece 121 is elastically deformed toward the inner wall side (outward direction) of the lock nut 102. When the lock nut 102 is further tightened, the outward force applied to the flexible piece 121 via the protrusion 122 gradually increases, and the outward deformation of the flexible piece 121 increases. As shown in FIG. 3, when the protrusion 122 gets over the second convex portion 112 and reaches the concave portion 113, the force applied to the flexible piece 121 is reduced, and the flexible piece 121 is opposite to the inner wall of the lock nut 102 (inner side). Direction). Thereby, the protrusion 122 is engaged with the recess 113.

  In addition, after the protrusion 122 gets over the 2nd convex part 112, when the flexible piece 121 deform | transforms to the inner wall of the lock nut 102 (inward direction), the front-end | tip part of the flexible piece 121 is the 1st convex part. By making contact with 111 or when the protrusion 122 makes contact with the bottom surface of the recess 113, a sound can be generated. Thereby, it can be confirmed by sound that the lock nut and the plug are tightened.

  In the connector of the present embodiment, the protrusion 122 protrudes in the axial direction on the inner surface of the lock nut 102 and is provided on the flexible piece 121 that can be elastically deformed in a direction intersecting the axial direction. Further, a space 124 that allows the flexible piece 121 to elastically deform is provided between the flexible piece 121 and the inner wall of the lock nut 102. For this reason, when the protrusion 122 gets over the second protrusion 112, the flexible piece 121 can be easily elastically deformed outward, and it is not necessary to apply a large force when the protrusion 122 gets over the second protrusion 112.

  Further, when the projection 122 gets over the second convex portion 112, the flexible piece 121 is restored, and the projection 122 comes into contact with the first convex portion, so that a clear click feeling can be obtained. Therefore, the end point of tightening of the lock nut 102 becomes clear, and it is possible to prevent the lock nut 102 from being insufficiently tightened or excessively tightened.

  The second convex portion 112 is not particularly limited as long as it is a convex portion on which the protrusion 122 can get over, and may have a shape that rises substantially perpendicularly from the surface of the plug, but the base end surface is the tip of the plug. It is preferable that the slope gradually rises in the direction. By adopting such a configuration, it is possible to feel a clear response when the protrusion 122 comes into contact with the second convex portion 112 and gets over it.

  The inclination angle θ2 of the slope on the base end side is preferably in the range of 5 ° to 20 °, and more preferably in the range of 9 ° to 15 °. It is preferable that the axial length d3 of the slope gradually rising toward the tip of the plug is 1.0 mm to 2.0 mm. Moreover, it is preferable that the axial length d4 from the slope of the base end part of the 2nd convex part 112 to the slope of a front end side is 0.3 mm-2.5 mm.

  In addition, by forming both the distal end surface and the proximal end surface as slopes, the protrusion 122 can easily get over the second convex portion 112 when the lock nut 102 is loosened. From the viewpoint that the protrusion 122 can easily get over when the lock nut 102 is tightened and the lock nut 102 is not easily loosened, it is preferable that the slope angle θ2 of the base-side slope is smaller than the slope angle θ1 of the slope on the distal end side.

  Although FIG. 2 shows a configuration in which the slope of the second convex portion 112 is a flat surface, it may be a curved surface. In the case of a curved surface, the curved surface can be convex upward or can be curved downward, but the curved surface convex downward makes it easier for the protrusion 122 to get over.

  The first convex portion 111 has a height h1 from the bottom surface of the concave portion 113 that is higher than a height h2 from the bottom surface of the concave portion 113 of the second convex portion 112. For this reason, it can prevent that the protrusion 122 gets over the 1st convex part 111, and the lock nut 102 moves to the front end side further. By making the surface on the base end side (concave side) of the first convex portion 111 a surface that is nearly perpendicular to the axis of the plug, the protrusion 122 can make it more difficult to get over the first convex portion 111. Moreover, since the protrusion 122 and the 1st annular convex part 111 contact | abut on surfaces, the fitting force at the time of clamp | tightening improves.

  The height h1 is preferably 0.05 mm to 1.0 mm, and the height h2 is preferably 0.02 mm to 0.2 mm. Increasing the height h2 makes it difficult for the projection 122 to get over the second convex portion 112, but it is possible to increase the response when the projection 122 gets over the second convex portion 112.

  The protrusion 122 is provided on a cylindrical flexible piece 121 that protrudes from the proximal end to the distal end side inside the lock nut 102. Since the flexible piece 121 is supported at one base end, and a space 124 is provided between the flexible piece 121 and the inner wall of the lock nut 102, the direction intersecting the axis of the plug 101 (internal and external). Direction). Therefore, the protrusion 122 has a large degree of freedom of deformation and can easily get over the second protrusion 112, and the lock nut 102 can be easily tightened as compared with the case where the protrusion is provided on the main body portion of the lock nut 102. It is.

  The protrusion 122 is not particularly limited as long as the protrusion 122 can get over the second protrusion 112 and can come into contact with the first protrusion 111, but the surface on the distal end side is a surface that is nearly perpendicular to the axis of the plug. Accordingly, the protrusion 122 can be made more difficult to get over the first convex portion 111.

As shown in FIG. 4, the surface on the distal end side of the protrusion 122 has a surface 125 that is nearly perpendicular to the axis of the plug that can come into contact with the surface on the proximal end side of the first convex portion 111, and the second convex portion 112. And an inclined surface 126 capable of coming into contact with each other. In this way, the protrusion 122 can easily get over the second protrusion 112 and can hardly get over the first protrusion 111. Note that the distal end of the flexible piece 121 may be configured to come into contact with the proximal end surface of the first convex portion 111.
The inclined surface provided on the distal end side of the convex portion 122 is preferably in contact with the inclined surface on the proximal end side of the second convex portion 112. For this reason, it is preferable that the inclination angle of the inclined surface 126 provided on the distal end side of the convex portion 122 and the inclined surface on the proximal end side of the second convex portion 112 are substantially equal.

  The surface on the base end side of the protrusion 122 is an inclined surface, and the inclination angle θ3 can be made to substantially coincide with the inclination angle θ1 of the inclined surface on the distal end side of the second convex portion 112. As a result, when the lock nut 102 and the thread of the female connector are engaged and tightened, the lock nut 102 is restricted from moving in the proximal direction, and the lock nut 102 and the plug 101 can be prevented from loosening. .

  In addition, a flat intermediate surface is provided between the front surface and the base surface of the protrusion 122, and the length d2 of the intermediate surface is equal to or less than the length d1 of the bottom surface of the recess 113. Can be. By adopting such a configuration, the entire protrusion 122 can be fitted into the recess 113.

  When the protrusion 122 is located between the first protrusion 111 and the second protrusion 112 and the recess 113 is stuck, the protrusion 122 can be prevented from coming into contact with the bottom surface of the recess 113. If the projection 122 does not contact the bottom surface of the recess 113 and a space is provided between the projection 122 and the bottom surface of the recess 113, the lock nut 102 can be rotated idle while the lock nut 102 is moved to the tip side. Can do. For this reason, it becomes easy to tighten the lock nut 102. In FIG. 2, an example in which the protrusion 122 is not in contact with the bottom surface of the recess 113 is shown, but a part of the protrusion 122 may be in contact with the bottom surface of the recess 113. Moreover, as shown in FIG. 5, it can also be set as the structure which does not produce space between the protrusion 122 and the bottom face of the recessed part 113. FIG.

  When the protrusion 122 is positioned between the first convex portion 111 and the second convex portion 112 and the concave portion 113 is stuck, the second convex portion 112 comes into contact with some part of the flexible piece 121. can do. In this way, the fitting force when the lock nut 102 is tightened can be further increased by the frictional force between the second convex portion 112 and the flexible piece 121. The portion of the flexible piece 121 that contacts the second convex portion 112 may be the protrusion 122 or a portion other than the protrusion 122 of the flexible piece 121. Moreover, the part which contact | abuts with the flexible piece 121 of the 2nd convex part 112 is not specifically limited.

  For example, as shown in FIG. 6, the corner portion on the proximal end side of the protrusion 122 can be in contact with the portion that is the side surface of the concave portion 113 of the second convex portion 112. Further, the second convex portion 112 is provided with a flat surface between the distal end side surface and the proximal end side surface, and when the protrusion 122 is fitted in the concave portion 113, the flexible piece 121. It is also possible to make the inner surface of the first and second flat portions 112 contact each other. In this way, since the flexible piece 121 and the second convex portion 112 are in contact with each other, the fitting force when the lock nut 102 is tightened can be further increased.

  FIG. 2 shows an example in which the protrusion 122 has a trapezoidal cross section and is formed by combining flat surfaces. However, the protrusion 122 may be formed by a curved surface, or may be formed by combining a flat surface and a curved surface. The shape can also be made.

  The flexible piece 121 preferably has a smaller outer diameter on the distal end side than on the proximal end side. Thereby, it is easy to secure the degree of freedom of deformation in the direction intersecting the axis of the flexible piece 121 and the protrusion 122 can be easily brought into contact with the second convex portion 112. Further, the flexible piece 121 has a tapered portion 123 whose thickness gradually decreases toward the distal end side from the protrusion 122, so that the tapered surface of the tapered portion 123 faces the outer peripheral surface of the plug 101. It may be. Thereby, the protrusion 122 can make it easier to get over the second protrusion 112.

  When the lock nut 102 is rotated, the flexible piece 121 provided with the protrusion 122 is provided so that the protrusion 122 and the first and second protrusions 112 act at any position. And at least one of the 1st convex part and the 2nd convex part 112 is provided annularly. By adopting such a configuration, the projection 122 can get over the second convex portion 112 by tightening the lock nut 102, and the positional relationship between the first convex portion 111 and the projection 122 can be increased. It is possible to prevent 122 from passing through the first convex portion 111.

  When the flexible piece 121 is provided in an annular shape, the first convex portion 111 and the second convex portion 112 may be provided at one place on the circumference of the plug 101 or at a plurality of places on the circumference. It can also be provided annularly over the entire circumference. By changing the ratio at which the second convex portion 112 is provided on the circumference, the force required when the convex portion 122 gets over the second convex portion 112 can be adjusted. When the flexible piece 121 is provided in an annular shape, the flexible piece 121 can be formed in a cylindrical shape that is continuously connected in the circumferential direction, but is narrower than the minimum width in the circumferential direction of the first convex portion and the second convex portion. If desired, one or more slits can be provided. By providing the slit, the protrusion 122 can be more easily elastically deformed.

  Moreover, when providing the 1st convex part 111 and the 2nd convex part 112 cyclically | annularly, the flexible piece 121 can also be set as the structure provided cyclically | annularly, and the structure each provided in one place or several places on the circumference You can also The first convex portion 111 and the second convex portion 112 can be provided in an annular shape that is continuous throughout the circumference, but if the width is smaller than the minimum width of the flexible piece 121 in the circumferential direction, the first convex portion 111 and the 2nd convex part 112 may be provided with the slit.

  In the connector of the present embodiment, the projection 122 is formed in the second convexity by inserting the plug 101 into the female connector with the lock nut 102 moved to the proximal end side and tightening the lock nut 102 against the male screw of the female connector. It can be used so as to get over the portion 112. Further, after inserting the plug 101 into the female connector and tightening the lock nut with respect to the male screw of the female connector, the lock nut 102 can be moved to the front end side so that the protrusion 122 gets over the second convex portion 112. . Furthermore, after the lock nut 102 is moved to the tip side in advance and the protrusion 122 is engaged with the recess 113, the plug 101 can be inserted into the female connector and the lock nut 102 can be tightened. . After tightening the lock nut, it is possible to prevent a situation where the connectors are detached.

  The connector of the first embodiment is configured such that the projection 122 gets over the second convex portion 112 and engages with the concave portion 113, but the projection 122 rides on the second convex portion 112 and the surfaces abut against each other. It is also possible to adopt a configuration in which frictional engagement is performed. When the surfaces come into contact with each other and frictionally engage with each other, it is possible to make the tightened lock nut 102 more difficult to loosen than when the protrusion 122 and the second convex portion 112 are in point contact.

  FIG. 7 shows the connector of the second embodiment. On the surface of the plug 101, there are provided a first convex portion 111 and a second convex portion 112 provided on the base end side of the first convex portion 111 as the plug-side engaging portion 114. The height h1 of the portion 111 is higher than the height h2 of the second convex portion 112, and a step 115 is generated between the first convex portion 111 and the second convex portion 112. On the base end side of the second convex portion 112, an inclined surface 112a that protrudes toward the distal end side is provided. The protrusion 122 provided on the flexible piece 121 has a slope 122a on the tip side, and the slope 122a abuts on the slope 112a of the second convex portion 112 and frictionally engages.

  When the lock nut 102 is tightened, the protrusion 122 moves to the tip side, the protrusion 122 abuts on the second protrusion 122, and the slope 122a rides on the slope 112a. Since the slopes 122a and 112a have substantially the same inclination angle, the surfaces come into contact with each other, and the frictional force acting between them gradually increases as the protrusion 122 moves toward the tip side. By the frictional engagement between the inclined surface 122a and the inclined surface 112a, the lock nut 102 can be firmly tightened and not easily loosened.

  As the protrusion 122 moves to the tip side, the force with which the protrusion 122 presses the second convex portion 122 increases. If this force becomes too large, the second convex portion 112 may be crushed. Moreover, the force required for tightening the lock nut becomes too large, or it becomes difficult to loosen again. In the connector of the present embodiment, a space 124 that allows the flexible piece 121 to elastically deform is provided between the flexible piece 121 and the inner wall of the lock nut 102. For this reason, the force which the protrusion 122 presses the 2nd convex part 122 can be released, and it becomes possible to clamp | tighten with moderate force.

  The inclination angle θ2 of the inclined surface 112a of the second convex portion 112 is preferably in the range of 5 ° to 20 °, and more preferably in the range of 9 ° to 15 °. The inclination angle of the protrusion 122 is adjusted so that the inclined surface 122a of the protrusion 122 abuts on the inclined surface 112a of the second protrusion 112 and is frictionally engaged. The inclination angle of the inclined surface 122 a of the protrusion 122 can be determined in consideration of the inclination angle of the inclined surface 112 a and the degree of elastic deformation of the flexible piece 121.

  The axial length d3 of the slope 112a is preferably 1.0 mm to 5.0 mm. In addition, in the state where the inclined surface 112a and the inclined surface 122a are frictionally engaged, the axial length d5 of the contact portion between the inclined surface 112a and the inclined surface 122a is set to 0. 0 from the viewpoint of making the tightened lock ring 102 difficult to loosen. It is preferable that it is 5 mm-5.0 mm.

  In the present embodiment, the first convex portion 111 is provided on the tip side of the second convex portion 112, and a step 115 is generated therebetween. By providing the 1st convex part 111, this prevents the protrusion 122 of the flexible piece 121 from getting over the 2nd convex part 112, and can prevent the lock nut 102 falling off to the front end side.

  The height h1 of the first protrusion 111 is preferably 0.05 mm to 1.0 mm, and the height h2 of the second protrusion 112 is preferably 0.02 mm to 0.5 mm. In this way, an appropriate level difference 115 can be generated. However, the 1st convex part 111 should just be provided as needed, and the 1st convex part 111 does not need to be provided.

  In the present embodiment, a horizontal plane is provided between the slope 112 a of the second convex portion 112 and the first convex portion 111. However, the horizontal plane may be provided as necessary and may not be provided.

  The connector of each embodiment can be formed of a resin material for general medical equipment such as polyethylene, polypropylene, polycarbonate, polyvinyl chloride, and ABS (acrylonitrile-butadiene-styrene copolymer) resin. The plug 101 and the lock nut 102 can be formed of the same material or different materials.

  The plug 101 can be a plug that satisfies the normal male luer standard, but is not limited thereto, and may be any plug that can be inserted into a target female connector. The lock nut 102 can be a lock nut provided with a thread that satisfies the standard of a normal luer lock, but is not limited thereto, and the lock nut 102 can be engaged with an engagement portion of a target female connector. If it is.

  The connector of each embodiment can be a connector attached to the tip of a tube or the like, or can be a part of a three-way cock, a needleless connector, and other medical devices.

  The medical connector of this indication can reduce the burden added to an engaging part when tightening a lock nut, can improve reliability, and is useful as a medical connector etc.

101 Plug 102 Lock nut 111 First convex part 112 Second convex part 112a Slope 113 Concave part 114 Plug side engaging part 121 Flexible piece 122 Projection 122a Slope 123 Tapered part 124 Space

Claims (13)

A plug extending from the proximal side to the distal side;
A lock nut mounted around the plug so as to be rotatable and axially movable;
The lock nut has a flexible piece projecting on an inner surface thereof, a space provided between the flexible piece and an inner wall of the lock nut, and allowing the flexible piece to elastically deform,
The flexible piece has a protrusion protruding inward,
The plug has a plug-side engagement portion including a convex portion provided on the outer peripheral surface of the base portion,
The flexible piece is deformed to the inner wall side of the lock nut when the projection comes into contact with the convex portion,
A medical connector in which at least one of the flexible piece provided on the lock nut and the convex portion is provided in an annular shape. The plug side engaging portion is provided between the first convex portion, the second convex portion provided on the base end side with respect to the first convex portion, and the first convex portion and the second convex portion. A recessed portion, and
The height from the bottom surface of the concave portion of the second convex portion is lower than the height from the bottom surface of the concave portion of the first convex portion,
The flexible piece is deformed to the inner wall side of the lock nut when the projection climbs over the second convex portion from the base end side toward the distal end side, and when the projection climbs over the second convex portion. The medical connector according to claim 1, further deformed to the opposite side to the inner wall of the lock nut.   The medical connector according to claim 2, wherein the second convex portion has a slope whose proximal end protrudes toward the distal end of the plug.   The medical connector according to claim 2, wherein the second convex portion has a slope on the distal end side and the proximal end side, and an inclination angle of the slope on the distal end side is larger than an inclination angle of the slope on the proximal end side.   The medical connector according to claim 4, wherein an inclination angle of a slope on a proximal end side of the protrusion and an inclination angle of a slope on a distal end side of the second convex portion are substantially the same.   The said protrusion has a location which is not contact | abutting with the bottom face of the said recessed part, when the said protrusion is located between the said 1st convex part and the said 2nd convex part. The medical connector as described in.   When the protrusion is positioned between the first protrusion and the second protrusion, the second protrusion is in contact with the flexible piece, and between the first protrusion and the second protrusion. The medical connector according to any one of claims 2 to 6, wherein the protrusion is held between the two. The first convex portion has a base end surface that is perpendicular to the axis of the plug,
The medical connector according to claim 2, wherein the protrusion has a surface orthogonal to the axis of the plug on a distal end side.   The protrusion has a surface orthogonal to the axis of the plug on the distal end side and an inclined surface, the inclined surface abuts on the second convex portion, and the inclination angle of the inclined surface is that of the second convex portion. The medical connector according to claim 8, wherein the medical connector substantially coincides with an inclination angle of the slope on the proximal side.   The flexible piece projects from the proximal end of the lock nut toward the distal end on the inner surface of the lock nut, and has a larger distance from the inner wall of the lock nut on the distal end side than the proximal end side. The medical connector according to any one of the above.   The flexible piece has a tapered portion extending in the distal direction on the distal end side with respect to the protrusion, and the tapered surface of the tapered portion faces the outer peripheral surface of the plug. The medical connector according to item 1.   The medical connector according to any one of claims 2 to 11, wherein the flexible piece, the first convex portion, and the second convex portion are annular. The convex portion is a slope whose proximal end protrudes toward the distal end of the plug,
The protrusion has a slope corresponding to the slope of the convex portion on the tip side,
The medical connector according to claim 1, wherein the slope of the protrusion and the slope of the convex portion are in contact with each other and frictionally engaged with each other.

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