JP2014210067A - Branch port - Google Patents

Abstract

[PROBLEMS] To provide a connection structure that can be distinguished from other branch ports, minimizing an increase in manufacturing cost and complication of equipment, and preventing air accumulation and fluid stagnation, and achieving an appropriate level of cleanliness. Provided is a branch port that can be maintained, has an improved cleaning effect, and can monitor forgetting to attach a cap. When a fluid circulation means is connected to a branch flow path, one flow path end portion of a connector is fitted with a first connector fitting portion provided in the branch flow path, and the connector The other flow path end 23 is fitted to the second connector fitting portion 42 provided in the fluid circulation means, whereby the branch flow path and the fluid circulation means are communicated via the connector flow path 21. When the cap 30 is attached to the housing 2, a bypass path 9 is formed which branches from the fluid inflow path 3 or the fluid outflow path 4 and communicates with the branch path, and when the cap is removed from the housing, An on-off valve 11 for blocking fluid leakage was provided inside the housing. [Selection] Figure 1

Description

  The present invention relates to a branch port, and more particularly to a branch port in which prevention of contamination at a branch site is realized.

  In general, in a system that handles liquids such as dialysate and RO water that require maintenance of an appropriate composition and safe cleanliness, it is necessary to frequently perform sampling (sampling) of liquids for inspection and analysis.

  As a method for performing such sampling, conventionally, a liquid of a sampling port is inserted by inserting a needle of a syringe with a needle as a sampling means into a sealing material of a sampling port. However, as the demand for cleaning increases, anti-contamination measures such as prevention of bacterial growth have become important, and sampling can be performed with a needleless syringe or the like without using an injection needle or puncture member. Various sampling ports have been developed (Patent Documents 1 to 3, etc.).

  In recent blood purification therapy, a part of the dialysate is extracted from the dialysate line in the blood purification apparatus and used as a replacement fluid or a replacement fluid (Patent Document 4), or a drainage tube for a blood extracorporeal circuit. Attempts have been made to increase the automation by eliminating the manual work associated with the circuit reconnecting work by connecting the liquid to the drainage line in the blood purification apparatus (Patent Document 5). At this time, the sampling port described above is connected to the collection port for connecting the collection tube of the extracorporeal blood circulation circuit to extract the dialysate in the blood purification device, or the drainage tube of the extracorporeal circulation circuit in the device. As a drainage port connected to the drainage line, it can be installed in a blood purification apparatus and used.

  By the way, in connection with a needleless syringe and a sampling port, the connection by the Luer taper structure which is easy to operate and can ensure high airtightness is widely used. For this reason, when developing a sampling port for sampling using a needleless syringe, conventionally, it has been common to provide a stapler on the branch port side that can be engaged with the male taper of the needleless syringe. .

Japanese Patent No. 4352368 JP 2009-207706 A JP 2012-205683 A JP 2011-161060 A JP 2010-184029 A

  However, when there is a mixture of sampling ports and drainage ports in one fluid processing system, it is necessary to pay close attention to the tube connection work so as not to misconnect the sampling tube and the drainage tube. From the viewpoint of preventing erroneous connection, there has been a demand for the development of a highly distinguishable branch port having a connection structure that can be distinguished from other branch ports. In this regard, Patent Document 5 discloses a configuration in which the connecting portion of the replacement fluid line connection port and the connecting portion of the overflow line connection port have different shapes (for example, see FIG. 14). The shape of the part itself is already known, and no suggestion has been made about improving the structure of the tube or port itself to enhance the identification of the connection structure. In addition, since it does not have a function to prevent liquid leakage in conjunction with the attachment and detachment of the tube, it is necessary to open and close the valve each time the tube is connected, improving operability and convenience. There was room.

  Also, in Patent Documents 1 to 3, as for the connection portion between the needleless syringe and the sampling port, the conventional configuration of providing the sampling port suitable for the male taper of the needleless syringe is employed as it is, There is no explicit description of preventing erroneous connection by increasing the identification of the connection structure.

  Accordingly, an object of the present invention is to have a connection structure that can be distinguished from other branch ports, and to minimize the increase in manufacturing cost and the complexity of equipment due to the improvement of the connection structure. A branch port that prevents the fluid from staying, maintains the cleanliness of the branch site and its surroundings properly, improves the cleaning effect when the cleaning liquid is passed, and monitors forgetting to attach the cap. It is to provide.

In order to solve the above problems, a branch port according to the present invention includes a main flow path including a fluid inflow path and a fluid outflow path, and a housing having a branch flow path branched from the main flow path and having one end formed as an open end. A cap detachably attached to the housing and capable of closing the open end of the branch flow path, and a biased and provided to block the branch flow path from the main flow path, and the cap is mounted on the housing Or when the cap is removed from the housing and a fluid flow means capable of flowing fluid is connected to the branch flow path, the valve body releases the block between the main flow path and the branch flow path. And a connector having a flow path with both ends being open ends and slidably housed along the inner peripheral wall surface of the branch flow path. For branching the road A Toki port,
When the fluid circulation means is connected to the branch flow path, one flow path end of the connector is fitted with a first connector fitting portion provided in the branch flow path, and the other of the connector By fitting the end of the flow path with the second connector fitting portion provided in the fluid circulation means, the branch flow path and the fluid circulation means are communicated via the flow path of the connector,
When the cap is attached to the housing, a bypass path is formed which branches from the fluid inflow path or the fluid outflow path and communicates with the branch flow path,
Provided inside the housing is an on-off valve that shuts off leakage of fluid from the branch from the fluid inflow path or the fluid outflow path to the bypass path when the cap is removed from the housing. It consists of what is characterized by that.

  In the branch port according to the present invention, when the cap is attached to the housing, the valve body provided in the branch port releases the blocking between the main channel and the branch channel, and the fluid inflow channel or the fluid A bypass path that branches from the outflow path and communicates with the branch flow path is formed, and the flow from the branch section to the bypass path is not blocked by the on-off valve, so the fluid inflow path of the main flow path or the fluid A branch channel provided in the outflow channel branches off to the bypass channel, and a sub-flow channel is formed that communicates with the main flow channel via the branch flow channel. A fluid flow is generated in the sub-flow channel. The state to do appears continuously. This flow prevents the accumulation of fluid and the accumulation of air in the bypass channel and the branch channel, suppresses the growth of bacteria and the accumulation of components in the fluid, and the cleanliness in the channel is appropriately high. Maintained. In addition, contamination of the branch flow path is prevented by attaching the cap. In addition, the flow direction of the fluid in the above-described sub-flow channel is not particularly limited, and the effect of maintaining cleanliness and preventing contamination can be obtained even when the fluid flows in any direction.

  On the other hand, when the cap is removed from the housing, the branch flow path is blocked by a valve body that is urged so as to block the branch flow path from the main flow path. As a result, fluid leakage to the main channel is prevented from overflowing. Then, when fluid circulation means (for example, sampling means, collection tube, drainage tube, etc.) through which fluid can be circulated is connected to the branch flow path, the cutoff of the branch flow path by the valve element is released, and the mainstream The path communicates with the fluid circulation means via the branch flow path, and the main flow path is branched. The flow direction of the branch channel when the main channel is branched is not particularly limited, and may be any direction. When the fluid circulation means is removed from the branch flow path after the flow path branching operation is completed, the branch flow path is again blocked from the main flow path by the energized valve body, and the overflow of the fluid is prevented. Further, the cap is in a state of being removed from the housing during the removal operation of the fluid circulation means, and the shutoff of the bypass path by the on-off valve is maintained, so that the fluid flowing through the main flow path does not leak out of the housing. Absent. Therefore, according to the branch port of the present invention, the cleanliness of the branch channel can be maintained by attaching a cap to the housing and allowing the fluid to flow in the branch channel. Even when the cap is temporarily removed to branch the fluid, overflow of the fluid from the branch port is prevented, and the flow path branching operation can be performed smoothly and quickly.

  Further, in the branch port, a connector having a channel whose both ends are open ends is accommodated slidably along the inner peripheral wall surface of the branch channel. When the fluid circulation means is connected to the branch channel, one channel end of the connector is fitted with a first connector fitting portion provided in the branch channel, and the other channel of the connector By fitting the end portion with the second connector fitting portion provided in the fluid circulation means, the branch flow path and the fluid circulation means are communicated with each other through the connector flow path. According to such a configuration, since the connection structure is different from that of the conventional branch port, erroneous connection of fluid circulation means such as a tube can be prevented even in an environment where a plurality of types of branch ports are mixed. . Moreover, since the fluid circulation means and the branch flow path are securely connected via the connector, fluid leakage is also prevented. Further, since the connection between the branch port and the fluid circulation means can be realized by a simple fitting structure, an increase in manufacturing cost and complexity of the fluid circulation means due to the adoption of a new connection structure can be minimized. And, due to the flow of fluid generated in the above-mentioned sub-flow path when the cap is mounted, the growth of bacteria and the accumulation of components in the fluid are suppressed for the connector slidably housed in the branch flow path, The cleanliness of the connector is kept high as well as other channels.

  Furthermore, the branch port according to the present invention is effective not only in normal operation but also when cleaning is performed by circulating a cleaning liquid throughout the fluid processing system including the branch port. That is, by performing the above-described cleaning process with the cap attached to the branch port housing, a part of the cleaning liquid flowing through the main flow channel flows into the sub flow channel including the branch flow channel and the bypass flow channel. The path, cap interior, bypass path and connectors are properly cleaned. As a result, the efficiency and facilitation of the cleaning operation with respect to the sub-channel and the connector are realized, and the cleaning time is shortened and the cleanliness is improved. The same effect is exhibited also when disinfecting the whole fluid processing system by circulating a disinfecting liquid instead of the cleaning liquid.

  In the above branch port, the shape of the connector is not particularly limited, but from the viewpoint of ensuring the communication between the connector and the branch flow path, one flow path end of the connector (that is, the flow path end on the branch flow path side) It is preferable that the tip is formed in a tapered shape, and the first connector fitting portion provided in the branch channel is formed in a shape that can be fitted to one channel end of the connector. Preferably it is.

  Further, from the viewpoint of ensuring communication between the connector and the fluid circulation means, the other flow path end of the connector (that is, the flow path end on the fluid circulation means side) is formed in a tapered shape with a thin tip. Preferably, the second connector fitting portion provided in the fluid circulation means is preferably formed in a shape that can be fitted to the other flow path end of the connector.

  In the branch port, it is preferable that the fluid circulation means and the branch flow path are configured to be screwable with each other, and the fluid circulation means is connected to the branch flow path by screwing the fluid circulation means to the branch flow path. . According to such a configuration, since the fluid circulation means is fastened at a predetermined position by screwing the fluid circulation means to the branch flow path, the fluid circulation means is prevented from being loosened or displaced.

  The structure of the connection structure between the fluid circulation means and the branch flow path is not particularly limited. For example, the fluid circulation means is provided with an internal thread and the branch flow path is provided with an internal thread, or the fluid circulation means is provided with an external thread. A configuration in which a female thread part is provided in the branch flow path can be adopted as appropriate. However, if other branch ports with different uses are mixed in the fluid treatment system including the branch port, erroneous connection prevention is possible. From this point of view, the configuration of the connection structure is preferably different from that of the other branch ports. In addition, from the viewpoint of improving the fitting between the connector flow path end and the connector fitting part, the male thread part can be screwed to the male thread part on the inner peripheral surface of the opening end part of the branch flow path. It is preferable to employ a configuration in which a female thread portion is formed, and the fluid circulation means is connected to the branch flow path by screwing the male thread portion of the fluid circulation means to the female thread portion of the branch flow path.

  Further, the branch port preferably employs a structure having a detecting means for detecting the attached / detached state of the cap and / or the connected state of the fluid circulation means according to the amount of displacement of the valve body. If the cap is not attached to the branch port, the branch portion provided with the branch passage is exposed to the atmosphere, and the branch passage is not cleaned by the fluid flowing in from the bypass passage, so the branch portion is contaminated. There is a possibility that the branch port may be left unattended. By providing detection means capable of detecting the cap attachment / detachment status and monitoring forgetting to attach the cap, the possibility of such contamination at the branch site is prevented and the cleanliness of the branch flow path is more maintained. Certainly achieved. Examples of the means for detecting the displacement amount of the valve body include an optical sensor, a limit switch, a reed switch, and the like.

  In the branch port, a convex portion is provided on one of the housing and the cap, and a concave portion is provided on the other. When the cap is mounted on the housing, the convex portion and the concave portion are fitted to position the cap. It is preferable. By providing such a fitting mechanism composed of a convex portion and a concave portion, it is possible to prevent the cap from being loosened and to secure the cap. Here, the installation form of the convex part and the concave part is not particularly limited. For example, the convex part may be provided on the housing and the concave part may be provided on the cap, or vice versa. Moreover, the number of convex parts and concave parts is not particularly limited, and a plurality of convex parts and / or concave parts may be provided.

  The above-mentioned fluid circulation means is not particularly limited as long as it can be attached to the opening end of the branch flow path. For example, the fluid circulation means in the present invention may be a sampling means (for example, a syringe) that has a reservoir and collects fluid while circulating the fluid from the branch flow path to the reservoir. The communication means (for example, piping, a drainage tube etc.) which connects a path | route and another apparatus may be sufficient. The flow direction of the fluid when the fluid circulation means is mounted is determined by the pressure difference between the pressure in the fluid circulation means and the pressure in the branch port, and may be any direction. In some cases, the pressure in the fluid circulation means and the pressure in the branch port are balanced, and the fluid stays in the fluid circulation means (for example, when sampling is completed).

  The branch port of the present invention is suitable as a sampling port of a sampling device used in a dialysis system requiring high cleanliness. The branch port of the present invention can properly maintain the cleanliness of the branch site and its surroundings, and can monitor forgetting to attach the cap. Can be collected.

  Further, the branch port of the present invention is suitable as a liquid collection port or a drainage port that requires regular cleaning. Since the branch port of the present invention can easily wash and disinfect the branch flow path, use of the branch port as a liquid collection port or a drainage port can facilitate the cleaning operation and shorten the cleaning time.

  According to the branch port of the present invention, the fluid circulation means and the branch channel are communicated with each other through a connector slidably accommodated in the branch channel, which is a distinguishable feature from other branch ports. By adopting the connection structure, it is possible to reliably connect the fluid circulation means and the branch flow path while preventing erroneous connection. In addition, by attaching a cap to the housing, a secondary flow path consisting of a branch flow path and a bypass path is formed, and a flow of fluid branched from the fluid inflow path or the fluid outflow path is generated in the branch flow path. Even when the fluid distribution means is not connected, the installation of the cap prevents air pools in the branch flow path, fluid retention, and contact with outside air, and the cleanliness of the branch flow path and the connector is maintained properly. The Furthermore, by providing detection means for detecting whether the cap is attached / detached and / or whether the fluid circulation means is attached / detached and monitoring forgetting to attach the cap, the cleanliness of the branch flow path can be more reliably maintained.

It is a longitudinal cross-sectional view at the time of each operation | movement of the branch port which concerns on one embodiment of this invention, (A) is the state at the time of cap attachment, (B) is the state when a cap is removed, (C) is a branch flow. The state where the drainage tube as the fluid circulation means is connected to the channel is shown.

Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings.
1A and 1B show a branch port 1 according to an embodiment of the present invention, in which FIG. 1A shows a state in which a cap 30 is attached to a housing 2 of the branch port 1, and FIG. A state in which the cap 30 is removed, and (C) show a state in which the drainage tube 40 is connected to the branch flow path 6 provided in the branch port 1 as a fluid circulation means.

  1A, a cap 30 is mounted on the housing 2 of the branch port 1 to form a space 31 between the housing 2 and the cap 30, and an O-ring as a sealing material provided in the cap 30 The sealing performance of the cap 30 is ensured by the 32 being pressed against the housing 2. The housing 2 includes a main flow path 5 including a fluid inflow path 3 and a fluid outflow path 4, a branch flow path 6 branched from the main flow path 5 and having one end formed as an open end, and a branch portion 8 provided in the main flow path 5. The bypass channel 9 is further branched and has one end formed at the open end. The open end 7 of the branch channel 6 and the open end of the bypass channel 9 both communicate with the space 31 in the cap 30. Yes. In the bypass passage 9, there is provided an on-off valve 11 biased in a direction to shield the bypass passage 9 by a spring 10, and the on-off valve 11 is pressed by a cap 30 attached to the housing 2, The bypass 9 is unshielded against the bias of the spring 10.

  The main channel side end 12 of the branch channel 6 is formed in a shape protruding into the main channel 5, and the fluid inflow channel 3 is disposed around the main channel side end 12 of the branch channel 6 in the main channel 5. An annular flow path 13 that communicates with the fluid outflow path 4 is formed. Further, a valve body 14 capable of opening and closing the main flow path side end portion 12 of the branch flow path 6 is provided in the main flow path 5 so as to face the main flow path side end portion 12. It is biased toward the main flow path side end portion 12 via the receiver 16. Since the fluid inflow path 3, the fluid outflow path 4 and the annular flow path 13 are not blocked by the valve body 14, the main flow path side end portion 12 of the branch flow path 6 is closed by the valve body 14. The fluid flowing through the fluid inflow path 3 can flow into the fluid outflow path 4 via the annular flow path 13 that bypasses the periphery of the branch flow path 6.

  In the branch channel 6, a connector 20 having a channel 21 whose both ends are open ends is housed slidably along the inner peripheral wall surface of the branch channel 6. In the connector 20, one flow path end 22 and the other flow path end 23 are both formed in a tapered shape with a thin tip, and one flow path end of the connector 20 is provided in the branch flow path 6. A first connector fitting portion 24 to which the portion 22 can be fitted is provided. Note that, from the viewpoint of airtightness and connection compatibility, it is preferable that both ends of the connector 20 and the shape of the fitting portion fitted to them conform to the regulations of ISO594.

  Further, a push rod 17 is housed in the branch flow path 6 so as to be slidable along the inner peripheral wall surface of the branch flow path 6, and the end of the push rod 17 on the main flow path side is in contact with the valve element 14. ing. The cross section of the push rod 17 is formed in a substantially cross shape, and four passages are defined in the branch flow path 6 by the push rod 17. Note that the shape of the push rod 17 is not limited to the above, and it is sufficient that the fluid can pass through the branch flow channel 6 in a state where the push rod 17 is housed in the branch flow channel 6.

  An internal thread portion 19 is provided on the inner peripheral surface of the open end 7 of the branch flow path 6. When the cap 30 is detached from the housing 2 and the fluid circulation means is connected to the branch flow path 6, the fluid circulation means The fluid threading means can be positioned and fixed by screwing the male thread part provided on the female thread part 19 to the female thread part 19.

  The cap 30 is provided with a pin 33, and when the cap 30 is mounted on the housing 2, the push rod 17 pressed by the pin 33 resists urging by the spring 15 and the valve body 14 and the valve body receiver 16. Is pushed off, and the branch channel 6 is released from communication with the main channel 5. Therefore, as shown in FIG. 1A, in the state where the cap 30 is mounted on the housing 2, the valve body 14 shuts off the branch flow path 6 from the main flow path 5 and the bypass path 9 by the on-off valve 11. Both of the blockings are released, and the branch portion 8 provided in the main channel 5 communicates with the annular channel 13 in the main channel 5 through the bypass channel 9, the space 31 in the cap 30, and the branch channel 6. A subchannel is formed. In addition, although the aspect in which the branch part 8 was provided in the fluid inflow path 3 is illustrated in FIG. 1, when the branch part 8 is provided in the fluid outflow path 4, a similar sub-flow path is formed. .

  A concave portion 34 is provided on the inner side of the cap 30, and a convex portion 35 that can be fitted into the concave portion 34 is provided on the upper portion of the housing 2. When the cap 30 is attached to the housing 2, the concave portion 34 is convex. By fitting with the portion 35, the cap 30 is properly positioned. Thereby, slack and position shift of the cap 30 can be prevented, and leakage of fluid is more reliably prevented.

  As shown in FIG. 1A, when the cap 30 is mounted on the housing 2 and the branch flow path 6 and the bypass path 9 are disconnected, most of the fluid flowing into the main flow path 5 is a fluid inflow path. 3 flows directly into the fluid outflow path 4 via the annular flow path 13 and the remaining portion once branches at the branching section 8 or the annular flow path 13, then passes through the above-mentioned sub-flow path and returns to the original state. To join the fluid. Thus, by ensuring the flow of the fluid in the bypass path 9, the space 31 in the cap 30, and the branch flow path 6, the propagation of bacteria in these flow paths, the accumulation of components in the fluid, and the like are suppressed, The cleanliness of the flow path and the connector 20 is maintained appropriately high. In addition, the flow direction of the fluid in the above-described sub-channel is the direction in which the fluid flows into the sub-channel from the branch portion 8 and reaches the annular channel 13, and the fluid flows into the sub-channel from the annular channel 13 to the branch portion 8. It can be in any of the directions of arrival, and in any direction the fluid flows, the effect of maintaining cleanliness and preventing contamination can be obtained.

  The branch port 1 has an optical sensor 18 as detection means for detecting the displacement of the valve body 14 based on the displacement of the valve body receiver 16. According to such an optical sensor, the attachment / detachment state of the cap 30 and the connection state of the drainage tube 40 can be detected based on the amount of displacement of the valve body 14, so that it is possible to monitor forgetting to attach the cap 30. The maintenance of the cleanliness of the branch flow path 6 is more reliably achieved. The detection means for detecting the displacement of the valve body 14 is not limited to the above, and various detection means such as a limit switch and a reed switch can be appropriately employed.

  When the flow path is branched, the cap 30 is detached from the housing 2, and then the fluid circulation means is connected to the branch flow path 6, and a part of the fluid flowing through the main flow path 5 is branched to the fluid circulation means. In the following, as an example, a case where the drainage tube 40 having the male screw portion 41 is connected to the branch flow path 6 and fluid is allowed to flow into the main flow path 5 from another fluid circuit (not shown) will be described. These explanations are based on the case where other fluid circulation means are used or when the flow direction of the fluid in the branch flow path 6 is different, for example, when a fluid collection tube is connected to the branch port 1 and fluid is extracted from the main flow path 5. The same applies to the case where the needleless syringe is connected to the branch port 1 and the fluid flowing through the main flow path 5 is collected.

  First, when the cap 30 is detached from the housing 2 and the pressing of the push rod 17 by the pin 33 is released, the valve body 14 is acted through the valve body receiver 16 by the action of the spring 15 as shown in FIG. Is pressed toward the main channel side end 12 of the branch channel 6, and the main channel side end 12 of the branch channel 6 is closed by the valve element 14. By this closing, the branch channel 6 is blocked from the main channel 5, and overflow of fluid from the open end 7 of the branch channel 6 is prevented. At the same time, the on-off valve 11 biased by the spring 10 shields the bypass passage 9, and the outflow of fluid from the branch portion 8 to the outside of the housing 2 is also prevented. Further, the removal of the cap 30 is detected by the optical sensor 18 that detects the displacement of the valve body 14. On the other hand, as described above, since the communication between the fluid inflow path 3 and the fluid outflow path 4 is ensured by the annular flow path 13, the cap 30 is removed, and the branch flow path 6 and the bypass path 9 are blocked from the main flow path 5. Even in this state, the flow of fluid from the fluid inflow path 3 to the fluid outflow path 4 is continued.

  Next, as shown in FIG. 1C, when the male screw portion 41 of the drainage tube 40 is screwed to the female screw portion 19 of the branch flow path 6 and the drainage tube 40 is connected to the branch flow path 6, the connector 20 is pushed into the main flow path 5 by the drainage tube 40. Then, one flow path end 22 of the connector 20 is fitted with a first connector fitting part 24 provided in the branch flow path 6, and the other flow path end 23 of the connector 20 is drained tube 40. The drainage tube 40 is communicated with the branch flow path 6 through the connector 20 by fitting with the second connector fitting portion 42 provided in the connector. Further, when the connector 20 pushed by the drainage tube 40 pushes the push rod 17, the valve body 14 and the valve body receiver 16 are pushed against the urging force of the spring 15, and the branch flow by the valve body 14 is performed. The blocking of the path 6 is released. As a result, the main flow path 5 communicates with the drainage tube 40 via the branch flow path 6 and the connector 20, and fluid flows into the main flow path 5 from the drainage tube 40 and detects the displacement of the valve element 14. Attachment of the drainage tube 40 is detected by the optical sensor 18. At this time, since the cap 30 is removed from the housing 2 and the shielding of the bypass path 9 by the on-off valve 11 is maintained, the fluid does not flow out of the housing 2 from the branch portion 8.

  When the fluid discharge operation is completed and the drainage tube 40 is removed from the branch flow path 6, the valve body 14 branches through the valve body receiver 16 by the action of the spring 15 as shown in FIG. It is pushed toward the main channel side end 12 of the channel 6. As a result, the branch flow path 6 is again blocked from the main flow path 5, the overflow of fluid from the open end 7 is prevented, and the removal of the drainage tube 40 is detected by the optical sensor 18.

  When the cap 30 is attached to the housing 2, as shown in FIG. 1A, the push rod 17 pressed by the pin 33 pushes the valve element 14 against the biasing force of the spring 15, and the branch flow The blocking of the path 6 is released, and the opening / closing valve 11 is pressed by the cap 30, whereby the shielding of the bypass path 9 is released, and the optical sensor 18 detects the mounting of the cap 30. As a result, there is a sub-flow path that connects the branch portion 8 provided in the main flow path 5 and the annular flow path 13 in the main flow path 5 via the bypass path 9, the space 31 in the cap 30 and the branch flow path 6. Re-formation and fluid flow are generated in these flow paths to prevent fluid retention and air accumulation, and the cleanliness in the flow paths is maintained appropriately high. As described above, in the branch port of the present invention, since the leakage prevention mechanism linked to the attachment and detachment of the cap and the fluid circulation means is provided, the flow path branching work can be easily performed and the working time can be shortened. Is done. Further, since there is no need to separately perform opening and closing operations of the valve, erroneous operation is prevented in advance.

  Further, as shown in FIG. 1C, in the present invention, the fluid circulation means and the branch port are connected by providing the fluid circulation means with a relatively simple structure such as the second connector fitting portion and the male screw portion. Therefore, the increase in manufacturing cost and the complexity of the fluid distribution means due to the adoption of a new connection structure can be minimized.

  The configuration of the branch port 1 is also effective when a cleaning liquid is circulated in the fluid processing system including the branch port 1 instead of the fluid to clean the entire fluid processing system. That is, by performing the above-described cleaning process in a state where the cap 30 is mounted on the housing 2 of the branch port 1, a part of the cleaning liquid flowing through the main channel 5 flows from the branch portion 8 to the space in the bypass path 9 and the cap 30. 31 flows into the branch flow path 6 via 31, and the flow of the cleaning liquid occurs not only in the main flow path 5 but also in the branch flow path 6, the space 31 in the cap 30 and the bypass path 9. As a result, the cleaning operation of the branch channel 6 and the connector 20 is performed quickly and effectively, and the cleaning time is shortened and the cleanliness is improved. The same effect is exhibited also when disinfecting the whole fluid processing system by circulating a disinfecting liquid instead of the cleaning liquid.

  When other branch ports having different uses are mixed in the fluid processing system including the branch port 1, the connection structure of the other branch ports is preferably different from that of the branch port 1. For example, in a fluid processing system having a branch port 1 and another branch port, when the branch port 1 is used as a drainage port and the other branch port is used as a liquid collection port, A male thread part is provided at the open end of the branch flow path, and a female thread part is provided in the liquid collection tube. By collecting the male thread part of the other branch port and the female thread part of the liquid collection tube, the liquid collection part is used. Adopting a configuration in which the tube is connected to another branch port is preferable from the viewpoint of preventing erroneous connection.

  The branch port according to the present invention is particularly suitable as a branch port used in a dialysis system requiring high cleanliness, and is suitably used for various applications such as a sampling port, a liquid collection port, and a drainage port. be able to.

DESCRIPTION OF SYMBOLS 1 Branch port 2 Housing 3 Fluid inflow path 4 Fluid outflow path 5 Main flow path 6 Branch flow path 7 Open end part 8 Branch part 9 Bypass path 10 Spring 11 On-off valve 12 Main flow path side end part 13 Annular flow path 14 Valve element 15 Spring 16 Valve body receiver 17 Push rod 18 Optical sensor 19 Female thread portion 20 Connector 21 Channel 22 One channel end 23 Other channel end 24 First connector fitting 30 Cap 31 Space 32 O-ring 33 Pin 34 Recess 35 Projection 40 Drainage tube 41 Male thread 42 Second connector fitting part

Claims (8)

A main flow path including a fluid inflow path and a fluid outflow path; a housing having a branch flow path branched from the main flow path and having one end formed at an open end; and an open end of the branch flow path that is detachably attached to the housing. A cap that can be closed, and is urged so as to block the branch flow path from the main flow path, and when the cap is attached to the housing, or when the cap is removed from the housing, the branch flow A valve body that releases a block between the main flow path and the branch flow path when a fluid flow means capable of flowing a fluid is connected to the path; and a flow path having both ends open. A branching port for branching the flow path of the pipe attached to the pipe, comprising a connector slidably housed along the inner peripheral wall surface of the flow path,
When the fluid circulation means is connected to the branch flow path, one flow path end of the connector is fitted with a first connector fitting portion provided in the branch flow path, and the other of the connector By fitting the end of the flow path with the second connector fitting portion provided in the fluid circulation means, the branch flow path and the fluid circulation means are communicated via the flow path of the connector,
When the cap is attached to the housing, a bypass path is formed which branches from the fluid inflow path or the fluid outflow path and communicates with the branch flow path,
Provided inside the housing is an on-off valve that shuts off leakage of fluid from the branch from the fluid inflow path or the fluid outflow path to the bypass path when the cap is removed from the housing. A branch port characterized by that.   The branch port according to claim 1, wherein one flow path end of the connector is formed in a tapered shape with a thin tip.   The branch port according to claim 1 or 2, wherein the other flow path end portion of the connector is formed in a tapered shape with a thin tip.   An external thread portion is formed in the fluid circulation means, and an internal thread portion that can be screwed to the external thread portion is formed on the inner peripheral surface of the opening end portion of the branch flow path, and the external thread portion of the fluid circulation means is connected to the branch flow path. The branch port according to any one of claims 1 to 3, wherein the fluid circulation means is connected to the branch flow path by being screwed to the female thread portion.   The branch port according to any one of claims 1 to 4, further comprising detection means for detecting whether the cap is attached / detached and / or whether the fluid circulation means is attached / detached according to a displacement amount of the valve body.   A convex portion is provided on one of the housing and the cap, and a concave portion is provided on the other. When the cap is attached to the housing, the convex portion and the concave portion are fitted to each other to position the cap. The branch port according to claim 1, wherein:   The branch port according to claim 1, which is used as a sampling port of a sampling device. The branch port according to any one of claims 1 to 6, which is used as a liquid collection port or a drainage port.

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