WO2017163789A1 - Medical connector and infusion set - Google Patents

Abstract

This medical connector and infusion set are provided with: a connector main body having an inner wall defining a flow channel; and a valve body disposed within the flow channel and having a center section with a communication section allowing the passage of fluid in the direction of flow of the flow channel, and an edge section located around the center section. The medical connector and the infusion set are configured so that when a counter pressure which is pressure in a direction from the downstream side to the upstream side of the flow channel is applied, the valve body opens the flow channel via the communication section, and when positive pressure which is pressure in a direction from the upstream side to the downstream side of the flow channel is applied, the valve body opens the flow channel with a space between the edge section and the inner wall interposed therebetween.

Description

Medical connector and infusion set

The present invention relates to a medical connector and an infusion set.

When an infusion is performed to a patient, an infusion set that constitutes a flow path for transporting a liquid such as a chemical solution is generally used. The infusion set is configured by connecting members such as an infusion tube, various medical devices, and a medical connector.

Conventionally, infusion sets in which a check valve is provided in a flow path are known in order to reduce the risk of back blood due to backflow from the downstream side to the upstream side in the flow path and blood removal due to detachment of members. (For example, refer to Patent Document 1).

JP 2005-296142 A

By using the infusion set described in Patent Document 1, the risk of reverse blood and blood removal can be reduced. By the way, in order to collect blood from a patient using an infusion set, it may be required to enable suction from the downstream side to the upstream side of the flow path. However, in the infusion set described in Patent Document 1, since there is a check valve, suction from the downstream side of the check valve to the upstream side of the check valve cannot be performed.

In order to enable suction from the downstream side to the upstream side, it is conceivable to provide a member incorporating a port that allows access to the flow path from the outside downstream from the check valve. Since it is necessary to secure a flow path of a certain length on the downstream side of the check valve, there is a certain restriction on the position where the check valve is provided in the infusion line. In addition, it is conceivable to release the connection between members in the infusion line, but there is a risk that bacteria or the like may enter from the part where the connection is released, a medical worker may touch the drug solution, etc., and the procedure may be complicated. was there.

The present invention has been developed in view of the above situation, and in an infusion line, a valve body capable of realizing both a flow of fluid from the upstream side to the downstream side and a flow of fluid from the downstream side to the upstream side is provided. An object of the present invention is to provide a medical connector and an infusion set.

In order to achieve the above object, a medical connector according to the present invention includes a connector main body having an inner wall that defines a flow path, a central portion having a communication portion that allows fluid to communicate in a direction along the flow path, and the central portion. And a valve body disposed in the flow path, and a reverse pressure that is a pressure from the downstream side to the upstream side of the flow path is applied to the valve body. And when the flow path is opened via the communication portion and a positive pressure, which is a pressure from the upstream side to the downstream side of the flow path, is applied, the flow is interposed between the peripheral edge portion and the inner wall. It is characterized by being configured to open the road.

Here, in the medical connector according to the present invention, when a positive pressure, which is a pressure from the upstream side to the downstream side of the flow path, is applied to the connector body, the peripheral portion is deformed while being in contact with the valve body. It is preferable to provide the first structure.

Moreover, the medical connector of this invention WHEREIN: It is preferable that a said 1st structure is a supported part which is supported by the said inner wall and covers the said center part in the downstream of the said flow path with respect to the said valve body. .

Further, in the medical connector of the present invention, the supported portion includes a contact portion that contacts the central portion when the positive pressure is applied, and a connecting portion that connects the contact portion and the inner wall, With
The contact portion is preferably closer to the valve body than the connection portion in the direction along the flow path.

In the medical connector according to the present invention, the connector body includes a second structure that can contact the peripheral edge, and the valve body is reverse pressure from the downstream side to the upstream side of the flow path. When pressure is applied, it is preferable that the peripheral portion is deformed so as to be separated from the first structure while the peripheral portion is in contact with the second structure.

In the medical connector of the present invention, the second structure is positioned on the upstream side of the flow path with respect to the valve body, and has a reduced diameter that is smaller than the valve body through a step surface. Part.

Further, in the medical connector according to the present invention, when the back pressure is less than a predetermined value, the valve body is in a state in which the central portion is covered with the supported portion while the peripheral edge is in contact with the stepped surface. It is preferable to close the flow path while maintaining the above.

In the medical connector according to the present invention, when the predetermined value is the first predetermined value, the first predetermined value opens the flow path when the positive pressure is applied to the valve body. The second predetermined value is preferably larger.

In the medical connector of the present invention, the valve body is in contact with the first structure on the downstream side of the flow path, and is in contact with the second structure on the upstream side of the flow path. It is preferable to be positioned in the flow path.

Furthermore, in the medical connector according to the present invention, the communication part is preferably a slit or a through hole.

In order to achieve the above object, the medical connector of the present invention includes a connector main body having an inner wall that defines a flow path, a central portion having a communication portion that allows fluid to communicate in a direction along the flow path, and And a valve body that is disposed in the flow path and has a peripheral edge located around the center part, and the valve body has a positive pressure that is a pressure from the upstream side to the downstream side of the flow path. When applied, the flow path is opened through the communication portion, and when a reverse pressure, which is a pressure from the downstream side to the upstream side of the flow path, is applied, the gap between the peripheral edge portion and the inner wall is applied. It is configured to open the flow path.

In order to achieve the above object, the infusion set of the present invention is characterized by including the above-described medical connector.

ADVANTAGE OF THE INVENTION According to this invention, in an infusion line, the medical connector and infusion set provided with the valve body which can implement | achieve both the flow of the fluid from an upstream to a downstream and the flow of the fluid from a downstream to an upstream are provided. can do.

It is a longitudinal cross-sectional view of the medical connector which concerns on one Embodiment of this invention. FIG. 2 is a cross-sectional view taken along line AA of the medical connector shown in FIG. FIG. 2 is a cross-sectional view taken along line BB of the medical connector shown in FIG. It is a longitudinal cross-sectional view in the state where the back pressure was applied to the flow path of the medical connector shown in FIG. It is a longitudinal cross-sectional view in the state where the positive pressure was applied to the flow path of the medical connector shown in FIG. It is a figure which shows the modification of the valve body with which the medical connector shown in FIG. 1 is provided. It is a longitudinal cross-sectional view of the modification of the medical connector shown in FIG. It is a front view of an infusion set provided with the medical connector which concerns on one Embodiment of this invention.

Hereinafter, a medical connector and an infusion set according to an embodiment of the present invention will be described in detail with reference to FIGS. 1 to 8.
In this specification, the upstream side of the flow channel means the right side in FIGS. 1, 4, 5, and 7, and the downstream side of the flow channel means the opposite side.

1 to 3 are a longitudinal sectional view, a sectional view taken along the line AA, and a sectional view taken along the line BB, respectively, of the medical connector 1 according to the present embodiment. 1 to 3, the pressure from the upstream side to the downstream side of the flow channel 14 (hereinafter referred to as “positive pressure” as appropriate) is also the pressure from the downstream side to the upstream side of the flow channel 14 (hereinafter, referred to as “positive pressure”). The medical connector 1 is shown in a state where it is not applied (referred to as “back pressure” as appropriate) (hereinafter referred to as “non-pressure state” where appropriate). As shown in FIGS. 1 to 3, the medical connector 1 includes a connector main body 10 and a valve body 30.

The valve body 30 has a central portion 31 and a peripheral edge portion 35 and is disposed in the flow path 14 defined by the connector main body 10. The central portion 31 has a communication portion 32 that allows fluid to communicate in a direction along the flow path 14. In this example, the communication part 32 is a slit 33 as shown in FIG. The peripheral edge portion 35 is located around the central portion 31. The valve body 30 of this example has a circular flat shape, and the central portion 31 and the peripheral portion 35 are integrally formed.

Examples of the material of the valve body 30 include natural rubber, isoprene rubber, butadiene rubber, styrene-butadiene rubber, nitrile rubber, chloroprene rubber, butyl rubber, acrylic rubber, ethylene-propylene rubber, hydrin rubber, urethane rubber, silicone rubber, and fluorine rubber. Various thermoplastic materials such as styrene, polyolefin, polyvinyl chloride, polyurethane, polyester, polyamide, polybutadiene, transpolyisoprene, fluororubber, chlorinated polyethylene, etc. Is mentioned.

The connector body 10 has an inner wall 13 that partitions the flow path 14. Moreover, the connector main body 10 is comprised by the 1st member 11 and the 2nd member 12 which were mutually connected in this example. The connector main body 10 includes a first structure 15 and a second structure 19.

In this example, the first structure 15 is a supported portion 16 that is supported by the inner wall 13 and covers the central portion 31 on the downstream side of the flow path 14 with respect to the valve body 30. In this example, the supported portion 16 is configured as a part of the first member 11.

The supported portion 16 includes a contact portion 17 that contacts the central portion 31 of the valve body 30 when a positive pressure is applied, and a connecting portion 18 that connects the contact portion 17 and the inner wall 13. The contact portion 17 is closer to the valve body 30 than the connecting portion 18 in the direction along the flow path 14. That is, the contact part 17 protrudes to the upstream side of the flow path 14 from the connection part 18, and has a cylindrical shape in this example. The connecting portion 18 is composed of a plurality of (four in this example) rod-like portions protruding from the abutting portion 17 toward the radially outer side of the abutting portion 17. Between these rod-shaped parts, an opening 18 a communicating in the direction along the flow path 14 is formed.

The second structure 19 can be in contact with the peripheral edge 35. Further, in this example, the second structure 19 is located on the upstream side of the flow path 14 with respect to the valve body 30, and is a reduced diameter portion 20 having a diameter smaller than that of the valve body 30 through the step surface 21. is there. The reduced diameter portion 20 is configured as a part of the second member 12 in this example.

Examples of the material of the connector main body 10 include polyolefins such as polyethylene, polypropylene, and ethylene-propylene copolymer; ethylene-vinyl acetate copolymer (EVA); polyvinyl chloride; polyvinylidene chloride; polystyrene; polyamide; polyimide; Polyimide (polymethyl 4-pentene-1); ionomer; acrylic resin; polymethyl methacrylate; acrylonitrile-butadiene-styrene copolymer (ABS resin); acrylonitrile-styrene copolymer (AS resin); butadiene- Styrene copolymer; Polyester such as polyethylene terephthalate (PET), polybutylene terephthalate (PBT), polycyclohexane terephthalate (PCT); polyether; polyether ketone Polyether ether ketone (PEEK); Polyetherimide; Polyacetal (POM); Polyphenylene oxide; Modified polyphenylene oxide; Polysulfone; Polyethersulfone; Polyphenylene sulfide; Polyarylate; Aromatic polyester (liquid crystal polymer); Various resin materials such as fluoroethylene, polyvinylidene fluoride, and other fluorine-based resins are listed. Also, a blend or a polymer alloy containing one or more of these may be used. In addition, various glass materials, ceramic materials, and metal materials may be used.

In the non-pressure state, the valve body 30 comes into contact with the first structure 15 on the downstream side of the flow path 14 and contacts the second structure 19 on the upstream side of the flow path 14. Is positioned inside. In this example, the valve body 30 is, as shown in FIG. 1, in the non-pressure state, the supported portion 16 as the first structure 15, specifically, the contact portion 17 on the downstream side of the flow path 14. In contact with the reduced diameter portion 20 as the second structure 19, specifically, the stepped surface 21 of the reduced diameter portion 20 on the upstream side of the flow path 14. Yes.

Here, a case where a reverse pressure is applied to the flow path 14 of the medical connector 1 will be described with reference to FIG.

When back pressure less than a predetermined value (hereinafter referred to as “first predetermined value” as appropriate) is applied to the flow path 14, the valve body 30 has a peripheral surface 35 with a stepped surface 21 as shown in FIG. 1. The center part 31 is maintained in a state covered with the supported part 16 while being in contact with the flow path, and the flow path 14 is closed. In addition, since the communication part 32 of this example is the slit 33, as long as the slit 33 is in a closed state, the flow path 14 is in a closed state. Therefore, when the counter pressure less than the first predetermined value is applied to the flow path 14, it is only necessary to maintain the state in which the slit 33 is closed. The abutment portion 17 may not be in contact with the central portion 31.

On the other hand, when a reverse pressure equal to or higher than the first predetermined value is applied to the flow path 14, the peripheral portion 35 is deformed so that the central portion 31 is separated from the first structure 15 while being in contact with the second structure 19. To do. In this example, the peripheral portion 35 is in contact with the reduced diameter portion 20 as the second structure 19, while the central portion 31 is the supported portion 16 as the first structure 15, specifically the contact portion 17. Deforms away from. More specifically, the central portion 31 is deformed so as to be separated from the contact portion 17 as it goes radially inward. At this time, since the valve body 30 is in a state in which the slit 33 as the communication portion 32 is opened due to the deformation of the central portion 31, the valve body 30 is opened through the communication portion 32 as shown in FIG. Become.

Next, the case where a positive pressure is applied to the flow path 14 of the medical connector 1 will be described with reference to FIG.

When a positive pressure less than the second predetermined value is applied to the flow path 14, the valve body 30 has the center portion 31 at the supported portion 16 while the peripheral edge portion 35 is in contact with the stepped surface 21 as shown in FIG. 1. The channel 14 is closed while maintaining the state covered with the water. Here, it is assumed that the second predetermined value is smaller than the first predetermined value. That is, the first predetermined value is larger than the second predetermined value. In addition, unless the clearance gap is formed between the peripheral part 35 of the valve body 30 and the inner wall 13 of the connector main body 10, the flow path 14 will be in the obstruct | occluded state. Therefore, when a positive pressure less than the second predetermined value is applied to the flow path 14, there is no need to form a gap between the peripheral edge portion 35 and the inner wall 13, and the central portion 31 contacts the supported portion 16. The peripheral edge portion 35 may be slightly deformed and separated from the step surface 21 while being in contact with the portion 17. At this time, the communication part 32 of the central part 31 may be in a state of not communicating because the slit 33 itself is closed, or may be in a state of not communicating by being covered by the contact part 17. .

On the other hand, when a positive pressure equal to or higher than the second predetermined value is applied to the flow path 14, the peripheral portion 35 of the valve body 30 is deformed while the central portion 31 is in contact with the contact portion 17. In other words, when a positive pressure equal to or greater than the second predetermined value is applied to the flow path 14, the contact portion 17 of the supported portion 16 as the first structure 15 contacts the central portion 31 of the valve body 30. However, the peripheral edge 35 is deformed. Specifically, the peripheral edge 35 is deformed so as to be separated from the inner wall 13 toward the outer side in the radial direction. At this time, since the valve body 30 creates a gap between the peripheral edge 35 and the inner wall 13 due to the deformation of the peripheral edge 35, the flow path is interposed between the peripheral edge 35 and the inner wall 13 as shown in FIG. 14 will be opened.

Thus, in the medical connector 1 according to the present embodiment, when a reverse pressure equal to or higher than the first predetermined value is applied to the flow path 14, the valve body 30 opens the flow path 14 via the communication portion 32. When a positive pressure equal to or greater than the second predetermined value is applied to the flow path 14, the valve body 30 opens the flow path 14 through between the peripheral edge portion 35 and the inner wall 13. Therefore, according to the medical connector 1, both the flow of fluid from the upstream side to the downstream side and the flow of fluid from the downstream side to the upstream side in the infusion line are realized by a simple procedure of adjusting the suction pressure. Therefore, suction from the downstream side to the upstream side becomes possible. Further, the medical connector 1 alternately applies a reverse pressure equal to or higher than the first predetermined value and a positive pressure equal to or higher than the second predetermined value to the flow path 14, so that the fluid on the downstream side of the valve body 30 in the flow path 14. Both the flow of the fluid from the upstream side to the downstream side and the flow of the fluid from the downstream side to the upstream side can be realized without stagnation. Furthermore, since the valve body 30 opens the flow path 14 between the peripheral part 35 and the inner wall 13, the medical connector 1 tends to increase the flow rate when the fluid flows from the upstream side to the downstream side.

Further, the medical connector 1 includes a connecting portion 18 on the downstream side of the valve body 30 in the flow path 14. Thereby, the medical connector 1 is caused by the turbulence generated by the fluid flowing from the upstream side to the downstream side between the peripheral edge portion 35 of the valve body 30 and the inner wall 13 trying to bypass the connecting portion 18. The fluid on the downstream side of the valve body 30 can flow downstream without being retained.

By the way, the communication part 32 which the valve body 30 has is not limited to the slit 33. FIG. 6 shows a valve body 30 ′ that is a modification of the valve body 30. As shown in FIG. 6, the communication part 32 included in the valve body 30 ′ may be a through hole 34. By adopting such a shape, when the fluid is sucked from the downstream side to the upstream side, the flow rate becomes larger than in the case where the communication portion 32 is the slit 33, so that the suction operation can be facilitated. The configuration of the valve body 30 ′ is the same as that of the valve body 30 except for having the through hole 34 as the communication portion 32, and thus the description thereof is omitted. In the case where the communication portion 32 is the through hole 34, the state where the through hole 34 is closed is maintained when a reverse pressure less than the first predetermined value is applied to the flow path 14 (see FIG. 1). Therefore, the contact portion 17 of the supported portion 16 is in a state of being in contact with the central portion 31 while covering the through hole 34. In addition, when the positive pressure less than the second predetermined value is applied to the flow path 14 (see FIG. 1), it is necessary to maintain the state in which the through hole 34 is closed. 17 will be in the state which contacted the center part 31, with the through-hole 34 covered.

A modification of the medical connector 1 will be described with reference to FIG. The medical connector 2 according to this modification has a configuration in which the left and right sides of the medical connector 1 shown in FIG. 1 are reversed, that is, the upstream side and the downstream side of the flow path 14 are reversed. Since the medical connector 2 has the same configuration as the medical connector 1 except that the upstream side and the downstream side of the flow path 14 are reversed, the description thereof is omitted.

When a reverse pressure of a first predetermined value or more is applied to the flow path 14 of the medical connector 2, similarly to the case where a positive pressure of a second predetermined value or more is applied to the flow path 14 of the medical connector 1, The flow path 14 is opened. Further, when a positive pressure equal to or higher than the second predetermined value is applied to the flow path 14 of the medical connector 2, similarly to the case where a reverse pressure equal to or higher than the first predetermined value is applied to the flow path 14 of the medical connector 1. Then, the flow path 14 is opened. The values of the first predetermined value and the second predetermined value change the partial thickness and physical properties of the valve body 30, such as the elastic modulus, or the shape of the first structure 15, such as the contact portion. It is possible to adjust appropriately by changing the area in contact with the 17 valve bodies 30 or changing the shape of the second structure 19, for example, the area in contact with the valve body 30 of the stepped surface 21. is there.

Thus, even with the medical connector 2 according to the modification, the flow of fluid from the upstream side to the downstream side and the fluid flow from the downstream side to the upstream side in the infusion line can be performed with a simple technique of adjusting the suction pressure. Both flows can be realized and suction from the downstream side to the upstream side becomes possible.

Finally, an infusion set 100 including the medical connector 1 or 2 will be described as an embodiment of the present invention. FIG. 8 is a view showing an infusion set 100 including the medical connector 1 or 2.

The infusion set 100 constitutes an infusion line that connects from an infusion holder such as an infusion bag (not shown in FIG. 8) to an indwelling needle (not shown in FIG. 8). Specifically, the infusion set 100 includes a plurality of medical tubes 101, a drip tube 102 in which the flow rate of the infusion agent supplied from the infusion holder can be visually recognized, and a plurality of infusion agent flow rates in the medical tube 101. The adjustment clamp 103 that can be changed to the state, the closing clamp 104 that closes the medical tube 101, the connection part 105 that can connect another medical device, and the medical that connects the plurality of medical tubes 101 Connector 1 or 2. Here, the several medical tube 101 of this embodiment is provided with the 1st medical tube 101a and the 2nd medical tube 101b.

When such an infusion set 100 is used, during normal use, the upstream end of the infusion line of the infusion set 100 is connected to the infusion holder, and the downstream end is connected to the indwelling needle, thereby Infusion can be performed. On the other hand, by connecting a suction device such as a syringe to the connection portion 105 of the infusion set 100, blood suction from a patient can be sucked from the downstream side to the upstream side.

That is, it is not necessary to determine the installation position of the medical connector 1 or 2 in the infusion line in consideration of blood collection from the patient. In the infusion set 100, the medical connector 1 or 2 is connected to the upstream side of the infusion line or It can be provided at any location on the downstream side. When performing infusion to a patient, it is preferable to provide the medical connector 1 or 2 on the downstream side of the infusion line in order to reduce the risk of reverse blood or blood removal. That is, with the medical connectors 1 and 2, since the suction from the downstream side to the upstream side can be realized by adjusting the suction pressure at the time of blood collection or the like, for the purpose of reducing the risk of reverse blood or blood removal, Medical connectors 1 and 2 can be placed at the downstream end of the infusion line.

The above description only shows one embodiment of the present invention, and it goes without saying that various modifications may be added within the scope of the claims.

For example, in the medical connector 1, the connector main body 10 has been described as being composed of two members, the first member 11 and the second member 12, but the connector main body 10 may be composed of one member. You may be comprised with the member or more.

Furthermore, the medical connector according to the present invention is not limited to the configuration of the medical connectors 1 and 2 described above, and may be, for example, a medical connector including an indwelling needle that is placed in a patient's vasculature. When it is set as the structure provided with an indwelling needle, what is necessary is just to set it as the structure by which an indwelling needle is integrally formed or connected to the downstream edge part of the flow path 14 of the connector main body 10 of the medical connector 1 or 2, for example. . The medical connectors 1 and 2 may be of a luer lock type so that they can be easily connected to another medical device such as the medical tube 101 (see FIG. 8). In such a case, a configuration in which a male luer portion is provided on the downstream side of the flow path 14 of the connector body 10 or a configuration in which a female luer portion having a thread on the outer surface is provided on the upstream side of the flow path 14 of the connector body 10 is used. That's fine. As described above, the upstream and downstream configurations of the flow path 14 in the medical connector according to the present invention can be changed as appropriate according to the usage and the like, and the above-described configurations of the medical connectors 1 and 2 are used. It is not limited.

DESCRIPTION OF SYMBOLS 1, 2 Medical connector 10 Connector main body 11 1st member 12 2nd member 13 Inner wall 14 Flow path 15 1st structure 16 Supported part 17 Contact part 18 Connection part 18a Opening 19 2nd structure 20 Shrinkage diameter Part 21 Stepped surface 30, 30 'Valve body 31 Central part 32 Communication part 33 Slit 34 Through hole 35 Peripheral part 100 Infusion set 101 Medical tube 101a First medical tube 101b Second medical tube 102 Drip tube 103 Adjustment clamp 104 Closure clamp 105 Connection

Claims (12)

A connector body having an inner wall that partitions the flow path;
A central part having a communication part capable of communicating in a direction along the flow path, and a peripheral part located around the central part, and a valve element disposed in the flow path;
With
The valve body is
When a reverse pressure that is a pressure from the downstream side to the upstream side of the flow path is applied, the flow path is opened through the communication portion,
When a positive pressure that is a pressure from the upstream side to the downstream side of the flow path is applied, the flow path is configured to be opened between the peripheral edge and the inner wall.
Medical connector. The connector main body includes a first structure that deforms the peripheral portion while being in contact with the valve body when a positive pressure that is a pressure from the upstream side to the downstream side of the flow path is applied.
The medical connector according to claim 1. The first structure is a supported portion that is supported by the inner wall and covers the central portion on the downstream side of the flow path with respect to the valve body.
The medical connector according to claim 2. The supported portion includes a contact portion that contacts the central portion when the positive pressure is applied, and a connection portion that connects the contact portion and the inner wall.
The contact portion is closer to the valve body than the connecting portion in the direction along the flow path,
The medical connector according to claim 3. The connector main body includes a second structure with which the peripheral edge can contact,
When a reverse pressure, which is a pressure from the downstream side to the upstream side of the flow path, is applied to the valve body, the central portion is in contact with the second structure while the peripheral portion is in contact with the second structure. Deform away from the
The medical connector according to any one of claims 2 to 4. The second structure is a reduced diameter portion that is located on the upstream side of the flow path with respect to the valve body and has a diameter smaller than that of the valve body through a step surface.
The medical connector according to claim 5. When the back pressure is less than a predetermined value, the valve body closes the flow path while maintaining the central portion covered by the supported portion while the peripheral edge is in contact with the stepped surface. To
The medical connector according to claim 6. When the predetermined value is the first predetermined value,
The first predetermined value is larger than a second predetermined value that opens the flow path when the positive pressure is applied to the valve body,
The medical connector according to claim 7. The valve body is positioned in the flow path by contacting the first structure on the downstream side of the flow path and contacting the second structure on the upstream side of the flow path. ,
The medical connector according to any one of claims 5 to 8. The communication part is a slit or a through hole,
The medical connector according to any one of claims 1 to 9. A connector body having an inner wall that partitions the flow path;
A central part having a communication part capable of communicating in a direction along the flow path, and a peripheral part located around the central part, and a valve element disposed in the flow path;
With
The valve body is
When a positive pressure that is a pressure from the upstream side to the downstream side of the flow path is applied, the flow path is opened through the communication portion,
When a reverse pressure, which is a pressure from the downstream side to the upstream side of the flow path, is applied, the flow path is configured to be opened between the peripheral edge portion and the inner wall.
Medical connector. An infusion set comprising the medical connector according to any one of claims 1 to 11.

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