JP6822054B2 - Medical connector - Google Patents

Description

The present disclosure relates to medical connectors, in particular to lock connectors having lock nuts.

Various medical devices such as syringes, catheters and tubes are connected by luer connectors. Luer connectors are broadly divided into slip connectors and lock connectors. 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 threaded on the inner surface around the plug of the male connector, and a thread or the like that engages with the screw of the lock nut is provided on the outer peripheral surface of the female connector. By engaging the lock nut of the male connector with the thread of the female connector and tightening it, the reliability of the connection can be improved.

However, the lock nut may unintentionally rotate, in which case the seal between the connectors may be incomplete, causing liquid leakage or, in the worst case, the connector coming off. Therefore, it has been studied to prevent the connectors from being separated from each other due to unintended rotation of the lock nut (see, for example, Patent Document 1). Specifically, the engaging portion consisting 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 so as to return to the state before the lock nut is tightened. Is being prevented.

U.S. Pat. No. 6,843,513

However, in the conventional connector, since the base end portion of the lock nut provided with the annular rib is thick and difficult to be deformed, there is no escape place for pressure when engaging the annular rib and the raised portion. There is a risk that the ridges of the ridges will collapse, and the reliability of the connection cannot be sufficiently ensured.

An object of the present disclosure is to reduce the load applied to the engaging portion when tightening the lock nut, and to realize a highly reliable medical connector.

One aspect of the medical connector comprises a plug extending from the proximal end side to the distal end side and a lock nut mounted rotatably and axially movable around the plug, the lock nut projecting to its inner surface. The flexible piece has a space provided between the flexible piece and the inner wall of the lock nut to allow the flexible piece to be elastically deformed, and the flexible piece has an inwardly protruding protrusion. The plug has a plug-side engaging portion including a convex portion provided on the outer peripheral surface of the base portion thereof, and the flexible piece is brought to the inner wall side of the lock nut by abutting the protrusion on the convex portion. At least one of the deformable flexible piece provided on the lock nut and the convex portion provided on the plug is provided in an annular shape.

One aspect of the medical connector is provided between the flexible piece protruding from the inner surface of the lock nut and the flexible piece and the inner wall of the lock nut, and has a space that allows the flexible piece to be elastically deformed. The flexible piece is deformed toward the inner wall side of the lock nut when the protrusion abuts on the convex portion. Therefore, 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. Further, 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 protrusion and the convex portion may have any positional relationship. , It is possible to prevent the protrusion from passing through the convex part .

In one aspect of the medical connector, the plug-side engaging portion includes a first convex portion, a second convex portion provided on the proximal end side of the first convex portion, and 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 of the first convex portion from the bottom surface, and the flexible piece has the protrusion on the proximal end side. When it gets over the second convex part from the tip side, it deforms to the inner wall side of the lock nut, and when the protrusion gets over the second convex part, the flexible piece deforms to the opposite side to the inner wall of the lock nut. Can be done.

When the protrusion gets over the second convex part, the flexible piece deforms to the inner wall side of the lock nut, and when the protrusion gets over the second convex part and reaches the concave part, the flexible piece becomes the inner wall of the lock nut. By adopting a configuration that deforms to the opposite side, the protrusion can easily get over the second convex portion. Therefore, it is possible to suppress the load applied to the second convex portion when the protrusion gets over the second convex portion. In addition, if the lock nut rotates unintentionally after tightening the lock nut, the second convex portion and the protrusion come into contact with each other before the female connector is disengaged, and the movement of the lock nut can be restricted. , The connectors can be hard to separate from each other.

In one aspect of the medical connector, the second convex portion may be a slope whose proximal end side rises toward the distal end of the plug. With such a configuration, when the lock nut is tightened, the protrusion can easily get over the second convex portion, and the click feeling when the lock nut is finished tightened can be increased. Can be done.

In one aspect of the medical connector, the second convex portion has slopes on the tip end side and the proximal end side, and the inclination angle of the slope on the distal end side may be larger than the inclination angle of the slope 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 convex portion, and the lock nut can be made difficult to loosen.

In one aspect of the medical connector, the inclination angle of the slope on the base end side of the protrusion and the inclination angle of the slope on the tip end side of the second convex portion may be the same. 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 toward the base end side.

In one aspect of the medical connector, when the protrusion is located between the first convex and the second convex, the protrusion can be prevented from contacting the bottom surface of the recess. With such a configuration, the lock nut idles, so that the lock nut can be easily tightened.

In one aspect of the medical connector, when the protrusion is located between the first convex and the second convex, the second convex abuts the flexible piece and is between the first and second convex. The protrusion can be pinched by. With such a configuration, the fitting force when the lock nut is tightened is improved.

In one aspect of the medical connector, the first convex portion may have a surface whose base 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 tip 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 and an inclined surface on the tip side, the inclined surface abuts on the second convex portion, and the inclination angle of the inclined surface is on the base end side of the second convex portion. The slope and the inclination angle may be substantially the same. In this way, it is possible for the protrusions to be difficult to get over the first convex portion and easy to get over the second convex portion.

In one aspect of the medical connector, the flexible piece may protrude from the base end of the lock nut toward the tip end on the inner surface of the lock nut, and the distance from the inner wall of the lock nut on the tip end side may be larger than that on the base end side. it can. With such a configuration, it is possible to secure a degree of freedom when the protrusion is deformed in the direction intersecting the axis. Furthermore, since the distance between the base end side of the flexible piece is large, it is less likely to be deformed than the tip end side, and when the protrusion comes into contact with the first convex portion, it will come off even if the lock nut is pulled toward the tip end side. It can be made difficult.

In one aspect of the medical connector, the flexible piece has a tapered portion on the tip side of the protrusion that gradually becomes thinner toward the tip side, and the tapered surface of the tapered portion faces the outer peripheral surface of the plug. You may do so. With such a configuration, the degree of freedom of deformation of the flexible piece can be increased.

In one aspect of the medical connector, the flexible piece can be annular. With such a configuration, the flexible piece can be easily held between the first convex portion and the second convex portion, and the lock nut can be made difficult 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 prevent the lock nut from coming off in the tip direction.

In one aspect of the medical connector, the convex portion is a slope whose base end side is raised toward the tip end side of the plug, and the protrusion has a slope corresponding to the slope of the convex portion on the tip end side, and is a slope of the protrusion. The slopes of the convex portions may be in contact with each other and frictionally engaged with each other. With such a configuration, since the surfaces are frictionally engaged with each other, it is possible to prevent the lock nut from loosening as compared with 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 the load applied to the engaging portion when tightening the lock nut, and it is possible to improve the reliability.

It is sectional drawing which shows the medical connector which concerns on 1st Embodiment. It is sectional drawing which shows the II part of FIG. 1 enlarged. It is sectional drawing which shows the state which tightened the lock nut. It is sectional drawing which shows the modification of the protrusion. It is sectional drawing which shows the modification of the protrusion. It is sectional drawing which shows the modification of the protrusion. 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.

As shown in FIGS. 1 to 3, the medical connector according to the first embodiment is attached to a plug 101 extending from the proximal end side to the distal end side and rotatably and axially movable around the plug 101. It is an male luer connector 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 to allow the flexible piece 121 to be elastically deformed. However, the flexible piece 121 has a protrusion 122 that protrudes inward. The plug 101 has a first convex portion 111 provided on the outer peripheral surface of the base portion thereof, a second convex portion 112 provided on the base end side of the first convex portion 111, and a first convex portion 111 and a second convex portion 111. It has a plug-side engaging portion 114 including a recess 113 provided between the portion 112 and the portion 112. The height h2 of the second convex portion 112 from the bottom surface of the concave portion 113 is lower than the height h1 of the first convex portion 111 from the bottom surface of the concave portion 113. The protrusion 122 comes into contact with the second convex portion 112 and can get over the second convex portion 112.

The connector of the present 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 base end side, the plug 101 is inserted into the female connector, and the lock nut 102 is rotated in a predetermined direction to obtain the female screw of the lock nut 102 and the female connector. The lock nut 102 can be tightened by engaging with the male screw of. By tightening the lock nut 102, the lock nut 102 gradually moves to the tip (female connector) side. As a result, the inner surface of the protrusion 122 of the lock nut 102 comes into contact with 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. Further, when the lock nut 102 is 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 becomes small, and the flexible piece 121 is on the opposite side (inside) of the inner wall of the lock nut 102. Transforms in the direction). As a result, the protrusion 122 engages with the recess 113.

After the protrusion 122 gets over the second convex portion 112, when the flexible piece 121 is deformed to the opposite side (inward direction) to the inner wall of the lock nut 102, the tip portion of the flexible piece 121 becomes the first convex portion. A sound can be emitted by contacting the 111 or the protrusion 122 with the bottom surface of the recess 113. This makes it possible to confirm by sound that the lock nut and plug have been tightened.

In the connector of the present embodiment, the protrusion 122 is provided on the flexible piece 121 that protrudes in the axial direction on the inner surface of the lock nut 102 and is elastically deformable in the direction intersecting the axial direction. Further, a space 124 is provided between the flexible piece 121 and the inner wall of the lock nut 102 to allow the flexible piece 121 to be elastically deformed. Therefore, when the protrusion 122 gets over the second convex portion 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 convex portion 112.

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

The second convex portion 112 is not particularly limited as long as it is a convex portion over which the protrusion 122 can be overcome, and may have a shape that rises substantially vertically from the surface of the plug, but the surface on the proximal end side is the tip of the plug. It is preferable that the slope gradually rises in the direction. With such a configuration, a clear response can be felt when the protrusion 122 comes into contact with the second convex portion 112 and overcomes the second convex portion 112.

The inclination angle θ2 of the slope on the proximal end side is preferably in the range of 5 ° to 20 °, and more preferably in the range of 9 ° to 15 °. The axial length d3 of the slope that gradually rises toward the tip of the plug is preferably 1.0 mm to 2.0 mm. Further, the axial length d4 from the slope of the base end portion of the second convex portion 112 to the slope on the tip end side is preferably 0.3 mm to 2.5 mm.

Further, by making both the surface on the distal end side and the surface on the proximal end side 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 hard to loosen, it is preferable that the inclination angle θ2 of the slope on the proximal end side is smaller than the inclination 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. When it is a curved surface, it can be a curved surface that is convex upward or a curved surface that is convex downward, but it is easier for the protrusion 122 to get over the curved surface that is convex downward.

The height h1 of the first convex portion 111 from the bottom surface of the concave portion 113 is larger than the height h2 of the second convex portion 112 from the bottom surface of the concave portion 113. Therefore, it is possible to prevent the protrusion 122 from passing over the first convex portion 111 and further moving the lock nut 102 toward the tip side. By making the surface of the first convex portion 111 on the base end side (concave side) close to perpendicular to the axis of the plug, it is possible to make it more difficult for the protrusion 122 to get over the first convex portion 111. Further, since the protrusion 122 and the first annular convex portion 111 are in contact with each other, the fitting force when tightened is improved.

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. By increasing the height h2, it becomes difficult for the protrusion 122 to get over the second convex portion 112, but the response when the protrusion 122 gets over the second convex portion 112 can be strengthened.

Further, the protrusion 122 is provided on a cylindrical flexible piece 121 that protrudes from the base end to the tip side inside the lock nut 102. Since the flexible piece 121 is supported at one position at the base end and a space 124 is provided between the flexible piece 121 and the inner wall of the lock nut 102, the direction (inside and outside) intersecting the axis of the plug 101. Easy to elastically deform in the direction). Therefore, the protrusion 122 has a large degree of freedom of deformation and can easily get over the second convex portion 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. Is.

The protrusion 122 is not particularly limited as long as it can get over the second convex portion 112 and can come into contact with the first convex portion 111, but the surface on the tip side should be a surface close to perpendicular to the axis of the plug. As a result, 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 tip end side of the protrusion 122 is the surface 125 close to perpendicular to the axis of the plug capable of contacting the surface on the base end side of the first convex portion 111, and the second convex portion 112. And the abutable inclined surface 126 can be combined. In this way, the protrusion 122 can easily get over the second convex portion 112 and can hardly get over the first convex portion 111. The tip of the flexible piece 121 may be configured to come into contact with the surface of the first convex portion 111 on the base end side.
It is preferable that the inclined surface provided on the tip end side of the convex portion 122 comes into contact with the inclined surface on the proximal end side of the second convex portion 112. Therefore, it is preferable that the inclined surface 126 provided on the tip end side of the convex portion 122 and the inclined surface on the proximal end side of the second convex portion 112 have substantially the same inclination angle.

The surface on the base end side of the protrusion 122 is set as an inclined surface, and the inclination angle θ3 thereof can be made substantially the same as the inclination angle θ1 on the slope on the tip 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. ..

Further, a flat intermediate surface is provided between the surface on the distal end side and the surface on the proximal end side 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 done. With such a configuration, the entire protrusion 122 can be fitted into the recess 113.

When the protrusion 122 is located between the first convex portion 111 and the second convex portion 112 and the concave portion 113 is fitted, the protrusion 122 can be prevented from contacting the bottom surface of the concave portion 113. If the protrusion 122 does not come into contact with the bottom surface of the recess 113 and a space is provided between the protrusion 122 and the bottom surface of the recess 113, the lock nut 102 can be idled with the lock nut 102 moved to the tip side. Can be done. Therefore, it becomes easy to tighten the lock nut 102. Although FIG. 2 shows an example in which the protrusion 122 is not in contact with the bottom surface of the recess 113 at all, a part of the protrusion 122 may be in contact with the bottom surface of the recess 113. Further, as shown in FIG. 5, a configuration may be made in which no space is generated between the protrusion 122 and the bottom surface of the recess 113.

The protrusion 122 is located between the first convex portion 111 and the second convex portion 112, and when the concave portion 113 is fitted, the second convex portion 112 comes into contact with some part of the flexible piece 121. can do. By doing so, 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 comes into contact with the second convex portion 112 may be a protrusion 122 or a portion other than the protrusion 122 of the flexible piece 121. Further, the portion of the second convex portion 112 that comes into contact with the flexible piece 121 is not particularly limited.

For example, as shown in FIG. 6, the corner portion on the base end side of the protrusion 122 can be brought into contact with the portion of the second convex portion 112 that is the side surface of the concave portion 113. Further, the second convex portion 112 is provided with a flat surface between the surface on the tip end side and the surface on the base end side, and when the protrusion 122 is fitted in the recess 113, the flexible piece 121 It is also possible to make the inner surface of the surface and the plane provided on the second convex portion 112 come into contact with each other. By doing so, since the flexible piece 121 and the second convex portion 112 come into 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 planes. However, the protrusion 122 may be formed by a curved surface or may be formed by combining a flat surface and a curved surface. It can also be shaped like this.

The flexible piece 121 preferably has a smaller outer diameter on the distal end side than on the proximal end side. As a result, the degree of freedom of deformation in the direction intersecting the axis of the flexible piece 121 can be easily secured, 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 on the distal end side of the protrusion 122, the thickness of which gradually decreases toward the distal end side, so that the tapered surface of the tapered portion 123 faces the outer peripheral surface of the plug 101. It may be. This makes it easier for the protrusion 122 to get over the second convex portion 112.

A flexible piece 121 provided with a protrusion 122 so that the protrusion 122 and the first convex portion and the second convex portion 112 interact with each other at any position when the lock nut 102 is rotated. And at least one of the first convex portion and the second convex portion 112 is provided in an annular shape. With such a configuration, the protrusion 122 can get over the second convex portion 112 by tightening the lock nut 102, and the protrusion 122 can get over the second convex portion 112 regardless of the positional relationship between the first convex portion 111 and the protrusion 122. It is possible to prevent the 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 location on the circumference of the plug 101 or at a plurality of locations on the circumference. It can also be provided in a ring shape over the entire circumference. By changing the ratio of the second convex portion 112 provided on the periphery, the force required for the convex portion 122 to get over the second convex portion 112 can be adjusted. When the flexible piece 121 is provided in an annular shape, the flexible piece 121 may have a cylindrical shape in which the whole is 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 may be provided. By providing the slit, the protrusion 122 can be more easily elastically deformed.

Further, when the first convex portion 111 and the second convex portion 112 are provided in an annular shape, the flexible piece 121 may be provided in an annular shape, or may be provided at one or several locations on the circumference, respectively. You can also do it. The first convex portion 111 and the second convex portion 112 can be provided in a continuous annular shape over the entire circumference, but if it is smaller than the minimum width in the circumferential direction of the flexible piece 121, the first convex portion 112 Slits may be provided in the 111 and the second convex portion 112.

In the connector of the present embodiment, with the lock nut 102 moved to the base end side, the plug 101 is inserted into the female connector, and the lock nut 102 is tightened with respect to the male screw of the female connector so that the protrusion 122 is second convex. 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 tip side so that the protrusion 122 gets over the second convex portion 112. .. Further, the lock nut 102 can be moved to the tip side in advance so that the protrusion 122 is engaged with the recess 113, and then the plug 101 is inserted into the female connector and the lock nut 102 can be tightened. .. After tightening the lock nut, it is possible to prevent the connectors from coming off from each other.

The connector of the first embodiment has a configuration in which the protrusion 122 rides over the second convex portion 112 and engages with the concave portion 113, but the protrusion 122 rides on the second convex portion 112 and the surfaces come into contact with each other. It can also be configured to be frictionally engaged. By abutting and frictionally engaging the surfaces, the tightened lock nut 102 can be made 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, a first convex portion 111 and a second convex portion 112 provided on the proximal end side of the first convex portion 111 are provided as the plug-side engaging portion 114, and the first convex portion 112 is provided. The height h1 of the portion 111 is higher than the height h2 of the second convex portion 112, and a step 115 is formed between the first convex portion 111 and the second convex portion 112. On the base end side of the second convex portion 112, a slope 112a that rises toward the tip end side is provided. The protrusion 122 provided on the flexible piece 121 has a slope 122a on the tip end side, and the slope 122a abuts and frictionally engages with the slope 112a of the second convex portion 112.

As the lock nut 102 is tightened, the protrusion 122 moves toward the tip end side, the protrusion 122 comes into contact with the second convex portion 122, and the slope 122a rides on the slope 112a. Since the inclination angles of the slope 122a and the slope 112a are substantially the same, the surfaces come into contact with each other, and the frictional force acting during this period gradually increases as the protrusion 122 moves toward the tip end side. By frictionally engaging the slope 122a and the slope 112a, the lock nut 102 is firmly tightened and can be prevented from being easily loosened.

As the protrusion 122 moves toward the tip end, 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. In addition, the force required to tighten the lock nut becomes too large, or it becomes difficult to loosen it again. In the connector of the present embodiment, a space 124 is provided between the flexible piece 121 and the inner wall of the lock nut 102 to allow the flexible piece 121 to be elastically deformed. Therefore, the force of the protrusion 122 pressing the second convex portion 122 can be released, and the protrusion 122 can be tightened with an appropriate force.

The inclination angle θ2 of the slope 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 slope 122a of the protrusion 122 is adjusted so as to abut and frictionally engage with the slope 112a of the second convex portion 112. The inclination angle of the slope 122a of the protrusion 122 can be determined in consideration of the inclination angle of the slope 112a 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. Further, in a state where the slope 112a and the slope 122a are frictionally engaged with each other, the axial length d5 of the contact portion between the slope 112a and the slope 122a is set to 0 from the viewpoint of making the tightened lock ring 102 difficult to loosen. It is preferably 5 mm to 5.0 mm.

In the present embodiment, the first convex portion 111 is provided on the tip side of the second convex portion 112 so that a step 115 is formed between them. By providing the first convex portion 111, it is possible to prevent the protrusion 122 of the flexible piece 121 from getting over the second convex portion 112 and prevent the lock nut 102 from falling off to the tip end side.

The height h1 of the first convex portion 111 is preferably 0.05 mm to 1.0 mm, and the height h2 of the second convex portion 112 is preferably 0.02 mm to 0.5 mm. In this way, an appropriate step 115 can be generated. However, the first convex portion 111 may be provided as needed, and the first convex portion 111 may not be provided.

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

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 made of the same material or different materials.

The plug 101 can be a plug that satisfies the standard of a normal male lure, but is not limited to this, and any plug that can be inserted into the target female connector may be used. The lock nut 102 can be a lock nut having a thread that meets the standard of a normal luer lock inside, but is not limited to this, and is a lock nut that can engage with the engaging portion of the target female connector. It should be.

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

The medical connector of the present disclosure can reduce the load applied to the engaging portion when tightening the lock nut and improve the reliability, and is useful as a medical connector or the like.

101 Plug 102 Lock nut 111 1st convex part 112 2nd convex part 112a Slope 113 Recessed 114 Plug side engaging part 121 Flexible piece 122 Protrusion 122a Slope 123 Tapered part 124 Space

Claims (13)

A plug that extends from the base end side to the tip end side,
Provided with a lock nut mounted around the plug so as to be rotatable and axially movable.
The lock nut has a flexible piece protruding from the inner surface thereof, and a space provided between the flexible piece and the inner wall of the lock nut to allow the flexible piece to be elastically deformed.
The flexible piece has a protrusion on the inner surface of the lock nut that protrudes inward from the base end of the lock nut and protrudes inward.
The plug has a plug-side engaging portion including a convex portion provided on the outer peripheral surface of the base portion thereof.
The flexible piece is deformed toward the inner wall side of the lock nut when the protrusion abuts on 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 proximal end side of the first convex portion, and the first convex portion and the second convex portion. Including recesses
The height of the second convex portion from the bottom surface of the concave portion is lower than the height of the first convex portion from the bottom surface of the concave portion.
The flexible piece is deformed to the inner wall side of the lock nut when the protrusion gets over the second convex portion from the base end side to the tip end side, and when the protrusion gets over the second convex portion. The medical connector according to claim 1, which is deformed to the side opposite to the inner wall of the lock nut. The medical connector according to claim 2, wherein the second convex portion is a slope whose base end side is raised toward the tip end direction of the plug. The medical connector according to claim 2, wherein the second convex portion has slopes on the tip end side and the proximal end side, and the inclination angle of the slope on the distal end side is larger than the inclination angle of the slope on the proximal end side. The medical connector according to claim 4, wherein the inclination angle of the slope on the base end side of the protrusion and the inclination angle of the slope on the tip end side of the second convex portion are substantially the same. Any one of claims 2 to 5, wherein when the protrusion is located between the first convex portion and the second convex portion, the protrusion has a portion that is not in contact with the bottom surface of the concave portion. Medical connector described in. When the protrusion is located between the first convex portion and the second convex portion, the second convex portion comes into contact with the flexible piece, and between the first convex portion and the second convex portion. The medical connector according to any one of claims 2 to 6, wherein the protrusion is sandwiched between the two. The first convex portion has a plane whose base end side is orthogonal to the axis of the plug.
The medical connector according to any one of claims 2 to 7, wherein the protrusion has a surface orthogonal to the axis of the plug on the tip end side. The protrusion has a surface orthogonal to the axis of the plug and an inclined surface on the tip end side, the inclined surface abuts on the second convex portion, and the inclination angle of the inclined surface is the inclination angle of the second convex portion. The medical connector according to claim 8, wherein the inclination angle of the slope on the proximal end side is substantially the same. The flexible piece has a large gap between the inner wall of the lock nut than the proximal end side in the preceding end, medical connector according to any one of claims 2-9. Any of claims 2 to 10, wherein the flexible piece has a tapered portion extending in the distal end direction on the distal end side of 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 base end side rises toward the tip end side of the plug.
The protrusion has a slope corresponding to the slope of the convex portion on the tip side, and has a slope corresponding to the slope of the convex portion.
The medical connector according to claim 1, wherein the slope of the protrusion and the slope of the protrusion are in contact with each other and frictionally engaged with each other.

Images