JP4769113B2 - connector - Google Patents

Description

  The present invention relates to a connector connected to a tubular body in which a flow path is formed, and more particularly to a closed connector that is normally closed and that is opened as needed to supply liquid to the flow path.

  In the medical field, liquid transportation such as infusion, blood transfusion, artificial dialysis, or blood sampling is often performed. A tubular tube is used for transporting various liquids, and a connector may be connected to the tube to join or block a plurality of liquids. Such a connector is attached in the middle of a tube and used as a co-infusion device for co-injecting other chemicals into the tube, and also used in various applications. For example, it can be used as a three-way stopcock that controls the supply of liquid from multiple flow paths by giving the connector a switching valve function, or it can be attached to the end of the chemical liquid tube and normally the liquid from the chemical liquid tube It can also be used as a connector having a normally closed valve function that shuts off the supply of liquid and supplies liquid as necessary.

  Generally, a connector includes a housing in which a flow path space in which a liquid such as a chemical solution flows is formed. The housing is provided with a connection port connected to the flow channel, and the flow channel is connected to the flow channel space through the connection port, whereby the chemical solution is circulated. In addition, an opening for supplying a liquid to be supplied from the outside is formed in the housing. A luer part of a syringe is inserted into the opening, and a chemical solution or the like is supplied from the syringe into the flow path space through the opening.

  However, in an open system connector with nothing attached to the opening, the outside and the channel space are always in communication with the luer part not inserted, and the chemical in the channel space spills outside. May end up. In addition, there is a risk that bacteria will propagate from the chemical solution adhering portion in the vicinity of the opening. For this reason, in recent years, a normally closed type valve member is attached to the opening, and when the luer part is not inserted, a closed connector is used in which the opening is liquid-tightly closed. Many.

Such a closed connector generally has a slit formed in a valve member attached to the opening (see Patent Document 1 and Patent Document 2). In a normal state (a state where the luer portion is not inserted and no liquid is supplied), the slit is closed. On the other hand, when supplying the liquid, the luer part is inserted into the slit. Then, a slit opens and a lure part is exposed to the flow path space in a housing. By injecting the liquid to be supplied from the syringe in this state, the liquid is discharged from the luer part into the flow path space, and the liquid is supplied. When the liquid supply is finished, pull the lure part out of the slit. Then, the slit is closed again and the opening is closed.
JP 2003-159336 A JP-A-8-206230

  A valve member used in a conventional closed connector has a slit that penetrates as described above, and a luer part is inserted through this slit. A part will deteriorate. If the slit portion deteriorates, the slit may not be sufficiently closed. If it becomes such a state, the merit of a closed system connector cannot fully be exhibited, and the liquid in a channel space may leak outside. In addition, there is a possibility that bacteria will propagate from around the slit.

Since the present invention is made in view of such circumstances ash, reliably communicate with the outside is cut off when not in use, and an object thereof is to provide a connector having a low has a valve member of the risk of leakage or bacterial reproduction.

In order to achieve the above-described object, the connector according to the present invention is characterized by having an opening that opens to the outside and a connection port connected to the tube, and a flow path space through which liquid can flow through the connection port. And a valve member attached to the opening, wherein the valve member faces the outside in a connector that supplies liquid from the outside into the flow path space by opening and closing the valve member. An inner surface facing the outer surface and the flow path space, and an inner slit that opens in the inner surface so as to bisect the inner surface and extends in a direction from the inner surface toward the outer surface, The main body portion is configured to sandwich the main body portion that closes the opening in a liquid-tight manner and is movable to the flow path space side by an external pressing force, and the surface of the main body portion where the inner slit is formed. Of the outer surface The main body is supported by the housing so that the main body is suspended so as to suspend the main body, and the main body moves to the flow path space side by a pressing force from the outside. A first support arm and a second support arm that sometimes apply an elastic force to the main body, and the elastic force acting on the main body by extending the first support arm and the second support arm The outer surface deformed so that a recess is formed when the inner slit is opened from the inner surface side forms a communication surface communicating with the flow path space .

  According to the connector of the present invention configured as described above, the valve member attached to the opening of the housing includes a main body portion and a support portion, and further, the main body portion is applied to the outer surface of the main body portion by an external pressing force. When the is pushed into the flow path space in the housing, a communication surface communicating with the flow path space is formed. Therefore, by pushing this communication surface from the outside with a pushing member such as a luer part of a syringe, the pushing member is pushed into the flow path space together with the main body part and communicates with the flow path space. When the liquid to be supplied from the pushing member is input in this state, the input liquid flows from the communication surface to the flow path space. In this way, the liquid is supplied.

  On the other hand, if the pushing member is released from the communication surface to release the pushing force, the main body returns to the original state (the state where it is not pushed into the flow path space) by the elastic force received from the support part. In the original state, since the main body portion can liquid-tightly close the opening, the flow passage space is blocked from communicating with the outside by the main body portion. Thus, the valve member in the connector of the present invention is a system in which the main body portion is pushed into the flow path space by an external pushing force (pressing force), and the outer surface of the main body portion itself communicates with the flow path space. This is different from the conventional system in which the outside and the flow path space are communicated with each other by a slit formed through the valve member. Therefore, the through slit formed in the conventional valve member is not required. Since the through slit is not required, it is possible to prevent the valve member from being half-opened when not in use (when the luer portion is not inserted and the liquid is not supplied) due to deterioration of the through slit. Therefore, when not in use, communication with the outside is surely blocked, and a connector with less risk of leakage and bacterial growth can be obtained.

  In the above-described present invention, the support portion elastically supports the main body portion in such a manner that the main body portion is suspended from the opening side when the main body portion is pushed into the flow path space side by the pushing force (pressing force) of the pushing member. . And if the pushing force (pressing force) from a pushing member is eliminated, the main-body part will be returned to an original state with the elastic force which generate | occur | produces from this support part. As long as such an action occurs, the support portion may be any type. For example, the support portion may be a spring, and the spring may be fixed to the main body portion. Further, the main body portion and the support portion may be integrally formed with a rubber member or the like. If it does in this way, the process of shape | molding a valve member will become simple.

  Further, it is not preferable that the support portion is attached to the entire circumference of the main body portion without a gap. If the support part is attached without any gap over the entire circumference of the main body part, there will be no gap for connecting the outer surface and the flow path space when the main body part is pushed into the flow path space. is there. Therefore, when the main body is pushed into the flow path space, it is sufficient that there is only a small gap for connecting the outer surface and the flow path space. The gap may be slit-shaped, or the support portion may be partially attached in the circumferential direction of the main body portion, and a region not attached in the circumferential direction may be defined as the gap. Preferably, a mode in which a plurality of support arms are attached to a position where the main body portion can be balanced (for example, a symmetrical position), and the main body portion is suspended by using the plurality of support arms as a support portion is conceivable. . If such a hanging valve opening / closing mechanism is employed, the outer surface of the main body and the flow path space can be communicated with each other through the gap between the support arms when the main body is pushed into the flow path space. it can.

  Further, the main body may have any shape as long as it has an outer surface facing the outside and an inner surface facing the flow path space and can close the opening in a liquid-tight manner. For example, even a disk-shaped object such as a milk bottle lid can be employed as long as it exhibits the above action. However, since it is necessary to liquid-tightly close the opening, it is preferable that the contact area with the opening is large. For example, a cylindrical rubber plug having an outer surface and an inner surface as end faces Good shape. If it is such a shape, the side peripheral surface can be made to contact an opening part in a wide range, and the liquid-tightness of flow-path space can fully be ensured.

The present onset bright, in addition to the structure described above, the main body portion, with an opening in said surface (cut is formed), an inner slit extending in the direction toward the outer surface from the inner surface forming you.

  When the outer surface of the main body is pushed by the luer part of the syringe or the like, a pushing force acts as a pressing force in the direction from the outside toward the flow path space, that is, the direction from the outer surface to the inner surface. On the other hand, when the main body portion is pushed into the flow path space side by this pushing force, a lifting force acts as an elastic force to return the main body portion to the original position from the support portion that elastically supports the main body portion. To do. This pulling force acts in the direction from the flow path space side to the outside, that is, the direction from the inner surface to the outer surface. Therefore, the main body receives a pushing force in a direction from the outer surface toward the inner surface, and receives a pulling force in a direction opposite to the pushing force. Therefore, couples due to these forces act on the main body.

  Here, on the inner surface of the main body, when the point of action of the lifting force is located on the outer peripheral side of the point of action of the pushing force, the inner surface of the main body is near the center due to the couple (the pushing force acts on the inner surface). To the outer periphery (the point where the pulling force acts) is received.

  In this case, as described in the present invention, when the inner slit that opens in the inner surface (a cut is formed) and extends in the direction from the inner surface toward the outer surface is formed, This inward slit opens. By such opening of the inner slit, a recess is formed on the outer surface of the main body portion at a position corresponding to the inner slit. If this hollow part is communicated with the flow path space, the liquid to be mixed and injected can efficiently flow into the flow path space from the hollow part.

  As described above, according to the present invention, not only the outer surface of the main body portion is pushed into the flow path space to communicate with the flow path space, but the inner surface side of the main body portion is opened using a couple of forces, and accordingly A recess is formed on the outer surface, and the recess is communicated with the flow path space. In addition, when the luer part is pushed into the outer surface of the main body part without causing such a dent, the tip opening of the luer part may be pushed against the outer surface, and the chemical solution may not be supplied from the luer part. In this respect, in the present invention, a gap is formed between the front end opening of the luer part and the outer surface due to the formation of the depression, so that the chemical solution can be supplied from the gap. Thus, the present invention is useful as a configuration for practical convenience.

  In the present invention, as described above, the inner surface of the main body portion receives a force in the direction from the center to the outside due to the couple, so that the lifting force from the support portion acts on the inner surface. The point is preferably located radially outward from the point of action where the pushing force acts. Therefore, the portion where the support portion is connected to the main body portion (that is, the portion where the lifting force acts on the main body portion) is more than the portion where the pushing force acts on the main body portion (that is, the portion where the main body portion receives the pushing force by the luer portion or the like). Is preferably located on the outer peripheral side.

  Further, it is preferable that the lifting force from the support part acts on the main body part from at least two different directions. By doing so, the force pulling outward from the center on the inner surface is distributed in a plurality of directions, and the inner surface side of the main body can be opened more reliably. Therefore, the support part is preferably connected to the main body part at two or more different parts. More preferably, the support portion may be connected to the main body portion in a symmetrical portion with the portion receiving the pushing force of the main body portion as a center. In this case, since the pulling force works almost evenly in the outer circumferential direction, the inner surface of the main body can be opened without unevenness.

  On the inner surface of the main body, an inward slit opens on a line connecting the point where the pushing force acts and the point where the pulling force from the support part acts, or in a direction parallel to the line. It is not preferable. This is because the above-described direction is a direction in which a force pulling outward from the center acts on the inner surface, and the slit cannot be opened even if the slit opens along this direction. Therefore, the inner slit is preferably opened in the direction other than the above direction on the inner surface. Most preferably, the inner slit is in the direction perpendicular to the line connecting the point of action of the pushing force and the point of action of the lifting force on the inner surface of the body, that is, the pushing when pushing the body by the pushing member It is good to open in the direction orthogonal to the line segment which connects a position and the raising position of the main-body part by a supporting member.

Also, inner slit that is formed so as to bisecting the inner surface of the body portion. When formed in this way, the inner slit can be easily opened by the force pulling outward from the center described above, and a recess formed on the outer surface of the main body corresponding to the opening of the inner slit, A groove is formed along the inner slit. Therefore, the groove-shaped depression portion functions as a flow path, and the liquid to be supplied can flow into the flow path space along the groove-shaped depression. Thus, since the liquid to be supplied flows along the groove-shaped depression, the liquid can be efficiently supplied without spilling from the outer surface.

Further, the main body portion is formed across the formation surface of the inner slit , and has an opening (a cut is formed) in the outer surface, and extends in a direction from the outer surface toward the inner surface, It is preferable that a first outer slit and a second outer slit parallel to the inner slit are formed. Due to the above couple force, a force that folds inward (center side) acts on the outer surface of the main body, but if the outer slit is formed, the outer slit is opened by the above force. Can relieve stress. Therefore, the reliability of the valve member can be improved and the life can be extended.

  On the outer surface of the main body, an outer slit opens on a line connecting the point where the pushing force acts and the point where the pulling force from the support part acts, or in a direction parallel to the line. It is not preferable. This is because the above-described force (a force that folds inward) acts on the outer surface, and even if the slit opens along this direction, the slit cannot be opened. Therefore, the outer slit is preferably opened in the direction other than the above direction on the inner surface. Most preferably, the outer slit is in the direction perpendicular to the line connecting the point of action of the pushing force and the point of action of the lifting force on the inner surface of the body, that is, the pushing when pushing the body by the pushing member It is good to open in the direction orthogonal to the line segment which connects a position and the raising position of the main-body part by a supporting member.

Et al is, the outer slit, the support portion may be provided in the vicinity of the portion attached to the body portion. Since the portion where the support portion is attached to the main body portion is the portion where stress concentration is most likely to occur, the stress concentration can be effectively reduced by providing an outer slit in the vicinity thereof.

The housing may be divided into a first part having the opening and a second part having the connection port, and the first part and the second part may have their respective dividing surfaces attached to each other. The connector includes the first portion and the second portion so that liquid in the flow path space does not leak outside through a gap between the dividing surface of the first portion and the dividing surface of the second portion. The elastic member may have elastic means elastically connected to the portion, and the elastic member may generate contraction force so that the dividing surface of the first portion is pressed against the dividing surface of the second portion. . According to the above configuration, when the luer part or the like is pulled out from the opening part, the first part moves together with the luer part by the frictional force acting between the valve member attached to the opening part and the luer part. The two parts are separated. When the first portion and the second portion are separated from each other, the elastic means is expanded, and the volume of the flow path space formed inside the first portion and the second portion is increased while maintaining liquid tightness. When the luer part is further pulled out, the elastic means further expands and the contraction force acting on the elastic means increases, and this contraction force eventually exceeds the frictional force. At this time, the first part is separated from the luer part, and extraction of the luer part (luer extraction) is completed, and the first part is moved to the second part side by the contraction force, and the flow path space volume is reduced. As the volume of the channel space decreases, the pressure in the channel space increases, and the channel space becomes a positive pressure. Here, when the flow path space in the connector becomes negative pressure, it is not preferable because it may cause a back flow of liquid in the medical tube connected to the connector. Since the positive pressure is generated in the flow path space, the occurrence of the backflow as described above can be suppressed.

(First embodiment)
Hereinafter, the connector according to the present invention will be described in detail with reference to the drawings. First, as a first embodiment, an example in which a connector according to the present invention is used as a three-way cock will be described. FIG. 1 is a plan view of a three-way cock according to the first embodiment of the present invention, FIG. 2 is a front view, and FIG. 3 is a left side view when FIG. 2 is a front view. As can be seen from these drawings, the three-way cock 100 includes a housing 10, a plug body 20, and a grip portion 30. The plug body 20 and the grip portion 30 are integrally formed, and the plug body 20 is mounted in the housing 10.

  The housing 10 includes a cylindrical part 15 and a first branch pipe 11, a second branch pipe 12, and a third branch pipe 13 that are three branch pipes attached to the cylindrical part 15. In these branch pipes, branch channels (first branch channel 11a, second branch channel 12a, and third branch channel 13a) are formed, respectively, Open to the inner wall. In this embodiment, polycarbonate (PC) is used as the material of the housing 10, but other resin materials such as polypropylene (PP), polyethylene terephthalate (PET), and the like are preferably used.

  4 is a partial cross-sectional view partially showing an AA cross section in FIG. 2, and FIG. 5 is a BB cross-sectional view in FIG. As shown in FIG. 5, the plug body 20 is rotatably fitted on the inner peripheral side of the cylindrical portion 15 of the housing 10. As shown in FIG. 4, two grooves 21 and 22 are formed on the outer periphery of the plug body 20. Further, a grip portion 30 is attached to one end portion of the plug body 20. The grip portion 30 includes three arm portions and is rotated integrally with the plug body 20. Therefore, the stopper 20 is also rotated on the inner peripheral side of the cylindrical portion 15 by rotating the grip portion 30. The arrangement state of the grooves 21 and 22 formed on the outer periphery of the plug body 20 is changed by the rotation of the plug body 20. By variously changing the arrangement state of the groove portions 21 and 22, it is possible to switch communication and blocking of the branch flow paths formed in each branch pipe.

  In the present embodiment, the plug body 20 and the grip portion 30 are integrally formed. Polyethylene (PE) is used as the material, but other resins such as polyoxymethylene (POM), polypropylene (PP) and the like can be used.

  As can be seen from FIG. 5, the first branch pipe 11 is connected to the right side of the cylindrical portion 15 in the figure, and the opening 11b of the first branch flow path 11a opens to the right side in the figure. Moreover, the 2nd branch pipe 12 is connected with the illustration left side of the cylindrical part 15, and the opening part 12b of the 2nd branch flow path 12a is opened to the illustration left side. Further, the third branch pipe 13 is connected to the upper side of the cylindrical portion 15 in the figure, and the opening 13b of the third branch flow path 13a is open to the upper side of the figure. In the present embodiment, the space in the third branch flow path 13a and the communication space communicating therewith correspond to the flow path space in the present invention, and the first branch pipe 11 and the second branch pipe 12 in the present invention. Corresponds to the connection port.

  The first branch pipe 11, the second branch pipe 12, and the third branch pipe 13 are connected to the cylindrical portion 15 at intervals of approximately 90 degrees. The first branch pipe 11 and the second branch pipe 12 are disposed to face each other with the cylindrical portion 15 interposed therebetween. Further, the third branch pipe 13 is disposed at a position 90 degrees apart from each of the first and second branch flow paths 11 and 12 in the circumferential direction of the cylindrical portion 15, and the third branch flow path 13a is It is formed so as to be orthogonal to the first branch channel 11a and the second branch channel 12a.

  As shown in FIG. 4, the third branch pipe 13 is formed to extend in the vertical direction from the side periphery of the cylindrical portion 15, and has a tapered inner wall whose inner diameter becomes smaller as the distance from the cylindrical portion 15 increases. A portion 13c and a cylindrical portion 13d that extends upward in the figure from the tip (small diameter end) of the tapered portion 13c and is formed in a cylindrical shape are configured. The tapered portion 13c forms a third branch flow channel 13a with its inner peripheral surface, and a step portion 13e is formed on its outer surface. The channel space in the third branch channel 13a formed inside the tapered portion 13c can communicate with the grooves 21 and 22 described above, and the liquid in the grooves 21 and 22 is transferred to the third branch. Distribution is possible via the flow path 13a.

  A partition wall 13f is provided in the third branch channel 13a as shown in the figure. The partition wall 13f is formed at a position where the axial direction coincides with the partition wall 23 formed between the two groove portions 21 and 22 formed on the outer periphery of the plug body 20, and in the state shown in FIG. The arrangement is formed between 21 and 22. Therefore, the liquids in both the groove portions 21 and 22 cannot be directly circulated unless they exceed the partition wall 13f.

  The opening 13b of the third branch channel 13a opens above the cylindrical portion 13d of the third branch pipe 13 in the figure. A valve member 40 is attached to the opening 13b. The valve member 40 includes a main body 41, a first support arm 42a, and a second support arm 42b, which are integrally formed of a rubber-like material. The main body 41 is inserted into the opening 13b so as to close the opening 13b in a liquid-tight manner. The main body 41 is formed in a columnar shape, and has an outer surface 41a which is an end surface facing the outside in the state shown in the figure, and an end surface on the side facing the channel space in the third branch channel 13a. The outer surface is formed by the inner surface 41b and the side peripheral surface 41c which is the peripheral surface between the outer surface 41a and the inner surface 41b. The opening 13b of the third branch channel 13a corresponds to the opening in the present invention.

  The main body 41 has a side peripheral surface 41c that is in contact with the inner wall of the cylindrical portion 13d of the third branch pipe 13, and is fitted into the opening 13b by elastic force. And it is attached to the opening part 13b so that it can be pushed in to the 3rd branch flow path 13a side by pressing the outer surface 41a from the outside.

  Further, as shown in the figure, the body portion 41 is formed with an inner slit 41d. The inner slit 41d is opened with a cut formed in the inner surface 41b, and extends substantially vertically from the opened portion toward the outer surface 41a. However, the inner slit 41d does not reach the outer surface 41a and is not formed so as to penetrate from the inner surface 41b to the outer surface 41a.

  FIG. 6 is a perspective view schematically showing the valve member 40 in the present embodiment. As shown in FIG. 6, the opening 41d1 on the inner surface 41b of the inner slit 41d is a linear opening (cut) that passes from the outer peripheral edge of the inner surface 41b to the edge in the opposite direction through the center O. It is said that. Therefore, the inner surface 41b is divided into two by the inner slit 41d, and the main body 41 is also formed to be divided into the first portion 41h and the second portion 41i by the inner slit 41d. However, the first portion 41h and the second portion 41i are not completely separated from each other and are common to the upper portion of the main body 41 in the figure.

  As shown in FIG. 1, the first support arm 42 a and the second support arm 42 b are formed to extend radially outward from the outer edge portion of the outer surface 41 a of the main body 41. In the present embodiment, these support arms are respectively attached to opposing positions on the outer surface 41a. As shown in FIG. 4, the first support arm 42a and the second support arm 42b are substantially plane-symmetric with respect to the main body 41, with the plane on which the inner slit 41d is formed as the plane of symmetry. It is attached at a circumferential position. These support arms 42a and 42b are routed over the upper end of the cylindrical portion 13d of the third branch pipe 13 to the outer wall side of the cylindrical portion 13d and the tapered portion 13c.

  As shown well in FIG. 4, a plastic cover 51 is attached to the outer periphery of the tapered portion 13 c of the third branch pipe 13. The cover 51 is formed in a dome shape. The center of the cover 51 is opened in a circular shape, and the cover 51 is attached to the third branch pipe 13 through the cylindrical portion 13d of the third branch pipe 13 through the opening. And the 3rd branch pipe 13 is attached so that the perimeter of the taper part 13c may be covered. A groove 51 a is formed along the circumferential direction on the inner periphery of the cover 51 on the lower end side in the figure. The cover 51 is fixed to the taper portion 13c by engaging the groove 51a with a protrusion 13g formed in the circumferential direction on the lower outer periphery of the taper portion 13c.

  Further, as shown in FIG. 4, the cover 51 has a protrusion 51 b formed on the inner peripheral side. The protrusion 51b is engaged with a step portion 13e formed on the outer periphery of the tapered portion 13c. The first support arm 42a and the second support arm 42b are sandwiched between portions where the protrusions 51b are engaged with the step portion 13e. Therefore, each support arm 42a, 42b is clamped and fixed by the cover 51 and the taper portion 13c, and the main body portion 41 is fixed to the first support arm 42a and the second support arm 42b by the support arms 42a, 42b thus fixed. It is supported in such a state that it can be hung.

  In the three-way cock 100 of the present embodiment configured as described above, the grip portion 30 is rotated to connect the groove portion 21 to the first branch flow channel 11a and the third branch flow channel 13a, and the groove portion 22 is set to the second branch. It communicates with the flow path 12a and the third branch flow path 13a. Further, a chemical solution tube is attached to the first branch pipe 11 and the second branch pipe 12. And a chemical | medical solution is poured from the chemical | medical solution tube connected to the 1st branch pipe 11. FIG. Then, this chemical solution flows from the first branch channel 11 a to the groove portion 21 of the plug body 20. The chemical solution in the groove portion 21 gets over the partition wall 21c and enters the third branch channel 13a. Furthermore, the chemical solution gets over the partition wall 13f in the third branch flow path 13a and enters the groove portion 22. And it flows into the 2nd branch flow path 12a from the groove part 22. FIG. In this way, a flow of the main flow path is formed.

  Here, as shown in FIG. 4, the opening 13 b of the third branch pipe 13 is liquid-tightly closed by the main body 41 of the valve member 40 and is in a closed state. Therefore, the flow of the main flow channel that circulates as described above does not leak from the third branch pipe 13. Further, any impurities from the outside do not enter the third branch flow path 13a via the opening 13b of the third branch pipe 13.

  When a chemical solution is mixedly injected into the main flow path from the third branch pipe 13 side, the lure part of the syringe is inserted into the main body part 41 of the valve member 40, and the valve member is opened. 7 (a) to 7 (c), the syringe luer part 52 is attached to the valve member 40 attached to the opening part 13b of the third branch pipe 13, and the chemical solution is supplied from the syringe to the main flow path. FIGS. 8A to 8C schematically showing the operation are perspective views showing the states of FIGS. 7A to 7C. 7A and 8A show the state before the luer part 52 is inserted into the valve member 40, and FIGS. 7B and 8B show the state where the luer part 52 is inserted into the valve member 40. FIG. 7 (c) and FIG. 8 (c) show the state in which the luer portion 52 is inserted into the valve member 40 and the valve member 40 is opened, respectively. Show.

  First, as shown in FIG. 7A and FIG. 8A, the valve member in which the tip of the luer part 52 of the syringe filled with the liquid to be mixed is attached to the opening 13b of the third branch pipe 13. Approach 40. Then, as shown in FIGS. 7B and 8B, the distal end portion of the luer portion 52 is pressed against the outer surface 41a of the main body portion 41 of the valve member 40, and the outer surface 41a is positioned below the figure. Push into the third branch flow path 13a. Then, due to the pushing force of the luer part 52, the main body part 41 is pushed downward in the figure and the first support arm 42a and the second support arm 42b are stretched.

  When the first and second support arms 42a and 42b are stretched, the elastic force from these support arms 42a and 42b acts on the main body 41, and the support arms 42a and 42b return the main body 41 to its original position. In order to return, a force (pull-up force) for raising the main body 41 is generated. FIG. 9 is a diagram showing the relationship between the pushing force from the luer part 52 and the lifting force from the first and second support arms 42a and 42b. As shown in FIG. 9, the pushing force Fa applied to the main body 41 of the valve member 40 by the tip opening portion of the luer portion 52 acts in a direction (downward direction in the figure) for pushing the main body 41 toward the third branch flow path 13a. To do. On the other hand, the lifting force Fb1 applied to the main body 41 by the first support arm 42a acts in a direction (upward direction in the drawing) in which the main body 41 is pulled up from the third branch flow path 13a side. Similarly, the lifting force Fb2 applied to the main body 41 by the second support arm 42b also acts in the direction (upward direction in the figure) for pulling the main body 41 from the third branch flow path 13a side to the outside. Since the pushing force Fa and the lifting forces Fb1 and Fb2 act in opposite directions from different positions, a couple acts on the main body 41.

  The couple acts between the pushing force Fa and the lifting force Fb1 and between the pushing force Fa and the lifting force Fb2. Further, the action lines of the lifting forces Fb1 and Fb2 are located radially outward of the main body 41 with respect to the action line of the pushing force Fa. Therefore, the main body portion 41 is brought into a state in which the vicinity of the center portion is pushed into the third branch flow path 13a side and the vicinity of the outer peripheral edge thereof is pulled up by the support arms 42a and 42b. In such a state, the outer surface 41a side of the main body portion 41 receives a force that is folded inward, while the inner surface 41b side of the main body portion 41 has an outer periphery from the center as indicated by arrows Fg1 and Fg2 in the figure. Receives a force that is pulled to the side.

  Further, an inner slit 41d is formed in the main body 41, and the inner slit 41d is formed so as to divide the inner surface 41b into two. The surface on which the inner slit 41d is formed is a plane of symmetry between the portion where the first support arm 42a is attached to the main body 41 and the portion where the second support arm 42b is attached to the main body 41. Of the first portion 41h and the second portion 41i divided by the inner slit 41d, the first portion 41h is supported by the first support arm 41a, and the second portion 41i is supported by the second support arm 42b. It is in such a state. Therefore, the force indicated by the arrow Fg1 mainly acts on the first portion 41h, and the force indicated by the arrow Fg2 mainly acts on the second portion 41i. As a result, as shown in FIGS. 7 (c), 8 (c) and 9, the inner slit 41d is opened, and the first portion 41h and the second portion 41i divided by the inner slit 41d are the lower portion shown in the drawing. Separate with.

  When the inner slit 41d is opened as described above, the base portion 41e of the inner slit 41d is pushed downward in the drawing, as can be seen from FIG. Then, the outer surface 41a of the main body portion 41 is also pushed down by being dragged by this, and the depression S is formed near the center. The recess S is formed in a groove shape along the inner slit 41d from the outer peripheral edge of the outer surface 41a to the opposite edge. Further, the recess S is formed between the tip opening portion of the luer part 52 and the outer surface of the main body part 41. Therefore, when the outer surface 41a of the main body 41 is pushed to the same height position as the upper end of the taper portion 13c (portion connected to the cylindrical portion 13d) by the luer portion 52, the recess S becomes the third branch flow. It communicates with the flow path space in the path 13a. And the chemical | medical solution from the lure part 52 is supplied to this groove-shaped hollow S, and flows into the 3rd branch flow path 13a from the hollow S further. In this way, mixed injection from the third branch flow path 13a is performed. Here, the portion of the outer surface 41a that forms the depression S corresponds to the communication surface in the present invention.

  If the luer part 52 is extracted from the state where the depression S communicates with the third branch flow path 13a, the pushing force Fa from the luer part 52 is eliminated. For this reason, the forces Fg1 and Fg2 also do not act and the inner slit 41d is closed. At the same time, only the lifting forces Fb1, Fb2 from the first and second support arms 42a, 42b act on the main body 41. Therefore, the main body 41 is pulled up by both the support arms 42a and 42b, and returns to the base position as shown in FIGS. 7 (a) and 8 (a). In this state, the outer surface 41a of the main body 41 is not in communication with the third branch channel 13a. Moreover, since the main-body part 41 has obstruct | occluded the opening part 13b of the 3rd branch pipe 13 liquid-tightly, the communication with the 3rd branch flow path 13a and the exterior is interrupted | blocked.

  As described above, in the three-way cock 100 according to this embodiment, the valve member 40 attached to the opening 13b of the third branch pipe 13 constituting the housing 10 has the main body 41 and the first support arm as the support. 42a and a second support arm 42b, and the outer surface 41a of the main body 41 has a third branch flow when the main body 41 is pushed into the flow passage space in the third branch flow passage 13a by the luer portion. It is configured to communicate with the path 13a. Therefore, by pushing the outer surface 41a of the main body part 41 from the outside with the luer part of the syringe, the luer part is pushed into the flow path space in the third branch flow path 13a together with the main body part 41, and the luer part becomes the third branch flow. It communicates with the road 13a. If the liquid to be supplied from the luer part is input in this state, the input liquid flows from the outer surface 41a to the third branch flow path 13a. In this way, the liquid is supplied.

  Further, if the luer part is separated from the outer surface 41a of the main body part 41 to eliminate the pushing force, the main body part 41 is restored to the original by the pulling force (elastic force) received from the first support arm 42a and the second support arm 42b. It returns to the state (the state where it is not pushed into the third branch flow path 13a). In the original state, the main body 41 liquid-tightly closes the opening 13b of the third branch pipe 13, so that the third branch flow path 13a is disconnected from the outside. Thus, the three-way cock 100 of this embodiment pushes the main body 41 into the flow path space by an external pushing force (pressing force), and communicates the outer surface 41a itself of the main body 41 with the flow path space. This method is different from the conventional method in which the outside and the channel space are communicated with each other through a slit formed through the valve member. Therefore, the through slit formed in the conventional valve member is not required. Therefore, the valve member can be prevented from being in a half-open state due to the deterioration of the slit, and communication with the outside is reliably blocked when not in use, so that a three-way stopcock with less risk of leakage and bacterial growth can be obtained.

  Moreover, in this embodiment, as the valve member 40, the main-body part 41 and the support part (the 1st support arm 42a and the 2nd support arm 42b) are integrally shape | molded with the rubber member. Therefore, the valve member 40 can be easily formed.

  Moreover, the main-body part 41 of the valve member 40 in this embodiment is made into the shape like a cylindrical rubber stopper which makes the outer surface 41a and the inner surface 41b an end surface. If it is such a shape, the side peripheral surface 41c can be made to contact in the wide range with the internal peripheral surface of the cylindrical part 13d connected to the opening part 13b of the 3rd branch pipe 13, and the 3rd branch flow path 13a A sufficient liquid-tightness can be ensured.

  In the present embodiment, the main body 41 has an opening 41d1 that opens to the inner surface 41b, and an inner slit 41d that extends from the inner surface 41b toward the outer surface 41a. The inward slit 41d is opened by a couple generated by the pushing force of the luer part and the lifting force from the first and second support arms 42a and 42b. By opening the inner slit 41d, a recess S is formed in the outer surface 41a at a position corresponding to the inner slit 41d. Since this recess S is formed between the tip of the luer part and the outer surface 41a, the liquid to be mixed and injected from the luer part can surely flow into the third branch channel 13a from the recess S.

  In the present embodiment, the first support arm 42 a and the second support arm 42 b are respectively attached to portions that are symmetrical with respect to the main body portion 41. For this reason, the pulling force generated by both support portions acts on the main body portion 41 evenly, so that the pushing force and the pulling force can be balanced. Therefore, it is possible to prevent such a balance from being tilted and tilting when the main body is pushed.

  In the present embodiment, the inner slit 41d is formed so as to divide the inner surface 41b of the main body 41 into two. If it forms in this way, it will become easy to open the inner slit 41d by couple. Further, the recess S formed on the outer surface 41a of the main body 41 when the inner slit 41d is opened becomes a groove shape along the opening 41d1 in the inner surface 41b of the inner slit 41d. Therefore, the groove-shaped depression portion functions as a flow path, and the liquid to be supplied can flow into the third branch flow path 13a along the groove-shaped depression. As described above, since the liquid to be supplied flows along the groove-shaped depression, the liquid can be supplied more efficiently without the liquid spilling from the outer surface.

(Second embodiment)
Next, the second embodiment of the present invention will be described. This embodiment is characterized in that an outer slit is provided in the main body of the valve member, and other points are the same as those of the first embodiment. It is the same form. In the following embodiments, the same points as those in the above-described embodiments will be denoted by the same reference numerals, detailed description thereof will be omitted, and differences will be mainly described.

  FIG. 10 is a plan view of a three-way cock in the present embodiment, and FIG. 11 is a side partial sectional view. FIG. 11 is a diagram corresponding to FIG. 4 in the first embodiment. As can be seen from the figure, in the three-way cock 200 of the present embodiment, the main body portion 41 of the valve member 40 is formed with a first outer slit 41f and a second outer slit 41g. The first outer slit 41f has an opening 41f1 that is opened in the vicinity of the outer surface 41a of the main body 41 to which the first support arm 42a is attached. From the opening 41f1 toward the inner surface 41b side. It is formed to hang down. The second outer slit 41g has an opening 41g1 that is opened in the vicinity of the outer surface 41a where the second support arm 42b is attached. The second outer slit 41g hangs down from the opening 41g1 toward the inner surface 41b. Is formed. However, the first outer slit 41f and the second outer slit 41g do not reach the inner surface 41b and are not formed so as to penetrate from the outer surface 41a to the inner surface 41b.

  As can be seen from FIG. 10, the opening 41f1 of the first outer slit 41f and the opening 41g1 of the second outer slit 41g formed on the outer surface of the main body 41 divide the outer surface 41a. In this way, the outer surface 41a is formed from the edge to the edge. Therefore, the outer surface 41a of the main body 41 is divided into three parts by the opening 41f1 of the first outer slit 41f and the opening 41g1 of the second outer slit 41g. The openings 41f1 and 41g1 are formed to be parallel to each other.

  Further, as shown in FIG. 11, the first outer slit 41 f and the second outer slit 41 g are formed to be parallel to the inner slit 41 d opened on the inner surface 41 b of the main body 41. In the present embodiment, the first outer slit 41f and the second outer slit 41g are formed in the main body 41 so as to be plane-symmetric with respect to the plane of formation of the inner slit 41d. Since the configuration other than the first outer slit 41f and the second outer slit 41g is the same as that of the first embodiment, the same portions are denoted by the same reference numerals, and the detailed description thereof is omitted. To do.

  Next, in the three-way cock 200 having the above configuration, a case where a chemical solution is mixed and injected from the third branch pipe 13 will be described. 12 (a) to 12 (c) schematically illustrate the operation until the medicinal solution is supplied from the syringe by attaching the luer part 52 of the syringe to the valve member 40 attached to the opening 13b of the third branch pipe 13. FIGS. 13 (a) to 13 (c) are perspective views of the states of FIGS. 11 (a) to 11 (c). FIGS. 12A and 13A show the state before the luer portion 52 is inserted into the valve member 40, and FIGS. 12B and 13B show the luer portion 52 inserted into the valve member 40. FIG. 12 (c) and FIG. 13 (c) show a state in which the luer portion 52 is inserted into the valve member 40 and the valve member 40 is opened, respectively. Show.

  First, as shown in FIGS. 12 (a) and 13 (a), the valve member in which the tip of the luer part 52 of the syringe filled with the liquid to be mixed is attached to the opening 13b of the third branch pipe 13. Approach 40. Then, as shown in FIGS. 12 (b) and 13 (b), the distal end portion of the luer portion 52 is pressed against the outer surface 41a of the main body portion 41 of the valve member 40, and the outer surface 41a is positioned below the figure. Push into the third branch flow path 13a. Here, in the present embodiment, the main body 41, the first support arm 42a, and the second support arm 42b of the valve member 40 are integrally formed of a rubber-like material. Therefore, the main body portion 41 is pushed downward in the figure by the pushing force of the luer portion 52 and the first support arm 42a and the second support arm 42b are stretched.

  When the first and second support arms 42a and 42b are stretched, the elastic force from these support arms 42a and 42b acts on the main body 41, and the support arms 42a and 42b return the main body 41 to its original position. In order to return, a force (pull-up force) for raising the main body 41 is generated. At this time, a couple acts on the main body 41 by the pushing force and the pulling force as described in the first embodiment. Due to this couple, the inner slit 41d opens as shown in the figure, and the first portion 41h and the second portion 41i divided by the inner slit 41d are separated from each other at the lower portion in the figure.

  When the inner slit 41d is opened, the base portion 41e of the inner slit 41d is pushed downward in the drawing. Then, the outer surface 41a of the main body portion 41 is pushed downward by being dragged by this, and a recess S is formed near the center as shown in FIGS. 12 (c) and 13 (c). The recess S is formed in a groove shape along the inner slit 41d to the edge of the outer surface 41a. Further, the recess S is formed between the tip opening portion of the luer part 52 and the outer surface of the main body part 41. Therefore, when the outer surface 41a of the main body 41 is pushed to the same height position as the upper end of the taper portion 13c (portion connected to the cylindrical portion 13d) by the luer portion 52, the recess S becomes the third branch flow. It communicates with the flow path space in the path 13a. And the chemical | medical solution from the lure part 52 is supplied to this groove-shaped hollow S, and flows into the 3rd branch flow path 13a from the hollow S further. In this way, mixed injection from the third branch flow path 13a is performed. Here, the portion of the outer surface 41a that forms the depression S corresponds to the communication surface in the present invention.

  FIG. 14 is a diagram showing the relationship between the pushing force from the luer part 52 and the lifting force from the first and second support arms 42a and 42b. As shown in FIG. 14, the pushing force Fa applied to the main body 41 of the valve member 40 by the tip opening portion of the luer part 52 acts in a direction (downward direction in the figure) for pushing the main body 41 into the third branch flow path 13a. To do. On the other hand, the lifting force Fb1 applied to the main body 41 by the first support arm 42a acts in a direction (upward direction in the drawing) in which the main body 41 is pulled up from the third branch flow path 13a side. Similarly, the lifting force Fb2 applied to the main body 41 by the second support arm 42b also acts in the direction (upward direction in the figure) for pulling the main body 41 from the third branch flow path 13a side to the outside. Since the pushing force Fa and the lifting forces Fb1 and Fb2 act in opposite directions from different positions, couple force acts on the main body portion 41.

  As described in the first embodiment, due to the couple acting on the main body 41, the main body 41 is pushed near the center into the third branch flow path 13a, and near the outer peripheral edge is the support arm 42a. , 42b. In such a state, the inner surface 41b side of the main body 41 receives a force acting in the direction of being pulled from the center to the outer peripheral side as indicated by arrows Fg1 and Fg2. For this reason, the inner slit 41d is opened, and the first portion 41h and the second portion 41i divided by the inner slit 41d are separated at the lower portion in the figure.

  On the other hand, the outer surface 41a side of the main body 41 receives a force acting in the direction of folding inward as indicated by arrows Fg1 'and Fg2' in the figure. In this case, since the first support arm 42a and the second support arm 42b are attached to the edge of the outer surface 41a of the main body 41 as shown in the figure, in the vicinity of the base end of these support arms. Stress is received by the force acting in the directions indicated by arrows Fg1 ′ and Fg2 ′.

  In this regard, in this embodiment, the first outer slit 41f is near the portion where the first support arm 42a is attached, and the second outer slit is near the portion where the second support arm 42b is attached. 41 g is formed respectively. For this reason, when these slits 42f and 42g open, the force which acts on this part is received. Therefore, the concentration of stress in this vicinity can be relaxed. Thus, in this embodiment, since the stress concentration acting on the outer surface 41a side of the main body 41 can be alleviated, the reliability of the valve member is improved and the life of the valve member is increased.

  When the luer part 52 is extracted from the state shown in FIG. 12C, FIG. 13C, or FIG. 14, the pushing force Fa from the luer part 52 is eliminated. Therefore, the forces Fg1, Fg2, Fg1 'and Fg2' also do not act, and the inner slit 41d, the first outer slit 41f and the second outer slit 41g are closed. At the same time, only the lifting forces Fb1, Fb2 from the first and second support arms 42a, 42b act on the main body 41. Therefore, the main body 41 is pulled up by both the support arms 42a and 42b, and returns to the original position as shown in FIGS. 12 (a) and 13 (a). In this state, the outer surface 41a of the main body 41 is not in communication with the channel space in the third branch channel 13a. Moreover, since the main-body part 41 is liquid-tightly attached to the opening part 13b of the 3rd branch pipe 13, the communication between the flow path space in the 3rd branch flow path 13a and the exterior is interrupted | blocked.

(Third embodiment)
Next, a third embodiment of the present invention will be described. This embodiment is characterized in that the connector of the present invention is applied not to a three-way stopcock but to a mixed injection device for injecting liquid from the middle of a flow path. The other aspects are the same as in the first embodiment.

  Fig.15 (a) is a front view of the mixed injection tool in this embodiment, FIG.15 (b) is a top view, FIG.15 (c) is a side view. 16A is a cross-sectional view taken along the line AA in FIG. 15B, FIG. 16B is a cross-sectional view taken along the line BB in FIG. 15A, and FIG. 16C is a cross-sectional view taken along the line C-- in FIG. It is C sectional drawing.

  As can be seen from these drawings, the mixed injection device 300 includes a housing 310. The housing 310 includes a first branch pipe 311, a second branch pipe 312, a third branch pipe 313, and a central junction 315, and each branch pipe is connected to the central junction 315. In these branch pipes, branch channels (first branch channel 311a, second branch channel 312a, and third branch channel 313a) are formed. Further, as can be seen from FIG. 16C, a partition wall 315a is formed in the central junction 315, and the partition 315a allows the internal space of the central junction 315 to be connected to the first continuous space 315b. It is divided into two communication spaces 315c. However, the first communication space 315b and the second communication space 315c can communicate with each other via a third branch channel 313a located at the upper part of the partition wall 315a.

  In addition, the first communication space 315b communicates with the first branch flow path 311a, and the second communication space 315c communicates with the second branch flow path 312a. Accordingly, the first branch flow path 311a communicates with the second branch flow path 312a via the first series communication space 315b and the second communication space 315c.

  As well shown in FIG. 15A and FIG. 16A, the first branch pipe 311, the second branch pipe 312 and the third branch pipe 313 are connected to the central junction 315 at intervals of about 90 degrees, respectively. Has been. The first branch pipe 311 and the second branch pipe 312 are arranged to face each other. The third branch pipe 313 is disposed at a position spaced from the first branch pipe 311 and the second branch pipe 312 by 90 degrees.

  As shown in FIG. 16C, the third branch pipe 313 includes a tapered portion 313c having a tapered inner wall, and a cylindrical portion 313d formed in a cylindrical shape extending upward from the tip of the tapered portion 313c. And is configured. And the opening part 313b is formed in the front-end | tip of the cylindrical part 313d. The tapered portion 313c has a third branch channel 313a formed therein. The third branch flow path 313a is in communication with both the first communication space 315b and the second communication space 315c in the central junction 315 located at the lower portion thereof. In addition, since the other structure, especially the structure of the valve member 40, etc. are the same as the said 1st embodiment, the same structure is represented with the same code | symbol and the detailed description is abbreviate | omitted.

  In the mixed injection device 300 of the present embodiment configured as described above, a chemical solution is allowed to flow from a chemical solution tube connected to the first branch pipe 311. Then, this chemical solution flows from the first branch flow path 311a to the first continuous space 315b of the central junction 315. The chemical solution in the first continuous space 315b gets over the partition wall 315a and enters the third branch flow path 313a. Further, the chemical solution enters the second communication space 315c formed on the opposite side of the first series communication space 315b across the partition wall 315a from the third branch flow path 313a. And it flows into the 2nd branch flow path 312a from the 2nd communication space 315c. In this way, a flow of the main flow path is formed.

  Here, as shown in FIG. 16C, the opening 313b of the third branch pipe 313 is liquid-tightly closed by the main body 41 of the valve member 40 and is in a closed state. Therefore, the flow of the main channel that circulates as described above does not leak from the third branch pipe 313. Further, any impurities from the outside do not enter the third branch flow path 313a via the opening 313b of the third branch pipe 313.

  When a chemical solution is to be mixed and injected from the third branch pipe 313 side, the luer part of the syringe is inserted into the main body part 41 of the valve member 40. And the main-body part 41 of the valve member 40 is pushed into the 3rd branch flow path 313a by a luer part, and the valve member 40 is opened. Since the operation when the valve member 40 is opened and the principle that the outer surface 41a of the main body 41 communicates with the third branch flow path 313a are the same as those described in the first embodiment, they are omitted here. Thus, the present invention can also be applied to mixed injection devices.

(Fourth embodiment)
Next, a fourth embodiment of the present invention will be described. In this embodiment, the connector of the present invention is attached to the end of the flow path, and the flow path is normally closed, and the luer part of the tube or syringe is It is characterized in that it is applied as a connector that opens the flow path when attached, and the other points are the same as in the first embodiment.

  FIG. 17A is a front view of the connector in the present embodiment, FIG. 17B is a side view, and FIG. 17C is a plan view. 18A is a cross-sectional view taken along the line AA in FIG. 17B, and FIG. 18B is a cross-sectional view taken along the line BB in FIG.

  As can be seen from these drawings, the connector 400 of this embodiment includes a housing 410. The housing 410 is formed with a connecting pipe part 411, a connecting pipe cover part 412, and a communication pipe part 413.

  The connection pipe part 411 has an elongated cylindrical shape, and a connection channel 411a is formed inside. A tube body such as a tube is connected to the connection pipe portion 411. Further, the connecting pipe cover part 412 is formed in a cylindrical shape so as to cover the outer periphery of the connecting pipe part 411. Further, an inner screw 412 a is formed on the inner wall of the connecting tube cover portion 412. The internal screw 412a is used to fix the tube by screwing with the tube connected to the connecting pipe portion 411. The communication pipe part 413 is connected to the proximal end side of the connection pipe part 411, and a communication space 413a is formed inside. This communication space 413a is connected to the connection flow path 411a in the connection pipe part 411 as shown in the figure. The communication space 413a corresponds to the flow path space in the present invention.

  As shown in FIG. 18 (b), the communication pipe portion 413 includes a tapered portion 413c having a tapered inner wall, and a cylindrical portion 413d that extends upward from the tip of the tapered portion 413c and is formed into a cylindrical shape. It is configured with. An opening 413b is formed at the tip of the cylindrical portion 413d. The tapered portion 413c has a communication space 413a formed therein. As described above, the communication space 413a communicates with the connection flow path 411a located in the lower portion thereof.

  A plastic cover 451 is attached to the outer periphery of the communication pipe portion 413. The cover 451 has a dome portion 451a formed in a dome shape and an external screw portion 451b standing from a central portion of the dome portion 451a. The upper end of the external screw portion 451b is opened, and the cylindrical portion 413d of the communication tube portion 413 is inserted through this opening, and the cover 451 is attached to the communication tube portion 413. Further, a groove along the circumferential direction is formed on the inner peripheral side of the lower end of the cover 451 in the figure, and this groove is engaged with the tapered portion 413c, so that the cover 451 is fixed to the communication pipe portion 413. ing. In addition, the external thread is formed in the external wall in the external thread part 451b. This external screw is for screwing and locking a luer part such as a syringe. In addition, since the other structure, especially the structure of the valve member 40, etc. are the same as the said 1st embodiment, the same structure is represented with the same code | symbol and the detailed description is abbreviate | omitted.

  In the connector 400 of the present embodiment configured as described above, first, a tube body such as a tube is connected to the connection tube portion 411, and the tube is screwed and fixed with the internal thread of the connection tube cover portion 412. At this time, when the syringe is not attached to the valve member 40, the opening 413b of the communication pipe portion 413 is liquid-tightly closed by the main body portion 41 of the valve member 40 as shown in FIG. Closed. Therefore, the tube attached to the connecting pipe portion 411 is closed by the valve member 40. Therefore, even when the liquid is already circulating in the tube, the liquid does not leak to the outside. Further, any impurities from the outside do not enter the communication space 413a via the opening 413b of the communication pipe portion 413.

  When it is desired to supply the chemical solution from the communication tube portion 413 side, the luer portion of the syringe is inserted into the main body portion 41 of the valve member 40 and is screwed and connected with the external screw portion to fix the luer portion. And the main-body part 41 is pushed into the communication space 413a with a lure part, and the valve member 40 is opened. Note that the operation when opening the valve member 40 and the principle that the outer surface 41a of the main body 41 communicates with the third branch flow path 313a are the same as those described in the first embodiment, and are omitted here. To do. Thus, the present invention can also be applied to the connector as described above.

(Fifth embodiment)
Next, a fifth embodiment of the present invention will be described. In this embodiment, in the three-way stopcock, the housing is divided and the housing divided by the elastic member is liquid-tightly connected. The other features are the same as those of the first embodiment.

  19 and 20 are cross-sectional views of the three-way cock according to the present embodiment. 19 corresponds to the AA sectional view in FIG. 2, and FIG. 20 corresponds to the BB sectional view in FIG. As can be seen from the figure, the three-way cock 500 of the present embodiment is formed as a separate body from the parts constituting the other housing so that the third branch pipe 13 can be separated from the cylindrical part 15. Therefore, the housing 10 includes a first portion 16 that forms the third branch pipe 13 and a second portion 17 that forms the first branch pipe 11, the second branch pipe 12, and the cylindrical portion 15, which are other parts. It is divided and formed.

  The third branch pipe 13 has a first cylindrical portion 13h formed with an opening 13b that opens upward in the figure, and a tapered inner wall whose inner diameter increases from the lower end of the first cylindrical portion 13h toward the lower side in the figure. The taper portion 13i has a second cylindrical portion 13j formed in a cylindrical shape that expands in the horizontal direction from the lower side of the taper portion 13i in the horizontal direction and extends in the vertical direction. The lower end of the second cylindrical portion 13j is open, and the end face of this opening is the dividing surface 16a of the first portion 16. On the other hand, the cylindrical portion 15 has an opening at the upper side thereof, and a surface surrounding the opening is a dividing surface 17 a of the second portion 17. Then, the divided surfaces 16 a and 17 a are abutted and the first portion 16 and the second portion 17 are combined to form the housing 10 in a state where both surfaces are in contact with each other. In the housing 10 combined in this way, the space in the third branch flow path 13a communicates with the space in the grooves 21 and 22 formed in the plug body 20 in the cylindrical portion 15, and flows through these spaces. A road space is formed.

  A bellows-like elastic member 61 formed of silicone rubber is attached along the inner periphery of the second cylindrical portion 13j. This elastic member 61 is formed in a cylindrical shape, one end edge of which is liquid-tightly connected to the side peripheral surface 15a of the cylindrical portion 15 located inside the dividing surface 17a, and the other end of the second cylindrical portion 13j. It is liquid-tightly connected to an inner peripheral end face 13k formed radially inward at the upper end. For this reason, the third branch pipe 13 and the cylindrical portion 15 are liquid-tightly connected by the elastic member 61, and the flow path passes through the gap between the dividing surface 16 a of the first portion 16 and the dividing surface 17 a of the second portion 17. The liquid in the space is prevented from leaking outside. Further, in the state shown in the figure, the elastic member 61 generates a contracting force in the axial direction. Therefore, the dividing surface 16a is pressed against the dividing surface 17a by the contraction force of the elastic member 61, and the first portion 16 and the second portion 17 are in contact with each other. In addition, since the other structure is the same as said 1st embodiment, the concrete description is abbreviate | omitted by using description of 1st embodiment.

  FIG. 21 is a diagram showing a state when the luer part 52 is inserted from the opening 13b of the third branch pipe 13 and when the luer part 52 inserted into the opening 13b is removed in the three-way cock 500 of the present embodiment. (A) is a state before the luer part 52 is inserted into the opening part 13b, (b) is a state where the luer part 52 is inserted into the opening part 13b, and (c) is a state where the luer part 52 is inserted into the opening part 13b. (D) shows the state after extracting the lure part 52 from the opening part 13b, respectively.

  From the state shown in FIG. 21 (a), the luer part 52 is inserted into the main body 41 of the valve member 40 attached to the opening 13b, and the valve member 40 is opened as shown in FIG. 21 (b). Then, the liquid is mixedly injected from the luer portion 52 into the flow path space from the recess portion S formed on the outer surface 41 a of the main body portion 41. In addition, since the operation | movement of the valve member 40 so far is the same as what was demonstrated by said 1st embodiment, the concrete description is abbreviate | omitted by using description of 1st embodiment.

  When extracting the luer part 52 from the opening part 13b, the lure part 52 is extracted vertically upward from the state shown in FIG. At this time, a frictional force based on the clamping force received from the support arm 42 of the valve member 40 is generated in the luer portion 52 in the pulling direction. This frictional force exceeds the contraction force of the elastic member 61 at the initial stage of pulling out the luer part 52. For this reason, as shown in FIG. 21C, as the luer portion 52 is pulled out, the first portion 16 forming the third branch pipe 13 sandwiching the luer portion 52 also moves upward in the drawing together with the luer portion 52. The first part 16 is separated from the second part 17. The elastic member 61 connected to the first portion 16 and the second portion 17 expands due to the separation. Due to the extension of the elastic member 61, the cross-sectional area of the flow path space formed in the housing 10 also increases as shown in FIG. 21C, and the flow path space volume increases.

  When the luer part 52 is pulled out to some extent, the contraction force of the elastic member 61 increases and exceeds the frictional force acting on the luer part 52. Then, the luer part 52 is extracted from the opening part 13 b of the third branch pipe 13. When the luer part 52 is extracted, the first part 16 moves so as to approach the second part 17 by the contraction force of the elastic member 61, and even if the dividing surfaces 16a and 17a come into contact with each other as shown in FIG. Return to the state. At this time, from the state where the flow path space is increased (the state shown in FIG. 21C), the elastic member 61 contracts to reduce the flow path space and return to the original volume (as shown in FIG. 21D). State). For this reason, when the lure part 52 is extracted from the opening part 13b of the 3rd branch pipe 13, the pressure in flow path space increases and flow path space becomes a positive pressure.

  By the way, when the luer part is inserted into a three-way stopcock or the like, the tip of the luer part or the valve body attached to the three-way stopcock may protrude into the flow path space to reduce the volume of the flow path space. If the luer part is extracted in such a state, the portion protruding into the flow path space is retracted to return to the original state, so that the volume of the flow path space increases and the pressure in the flow path space decreases, Road space becomes negative pressure. If the flow path space becomes negative pressure during extraction of the lure part, the liquid in the medical tube connected to the three-way cock may flow backward, so it is not preferable that the pressure in the flow path space becomes negative pressure.

  With respect to this point, in this embodiment, when the lure portion is pulled out, the flow space is once increased and the pressure in the flow space is decreased as shown in FIG. 21 (c). As shown in (d), the flow path space returns to the original state. At this time, the flow path space volume decreases and the pressure increases, so the flow path space becomes positive pressure. Therefore, it is possible to prevent the liquid in the medical tube connected to the three-way cock from flowing backward due to the negative pressure in the flow path space. In the present embodiment, in the state as shown in FIG. 21C, the flow path space volume increases, so the pressure in the flow path space decreases, and the flow path space has a negative pressure. There is a fear. At this time, by supplying a liquid from the luer part 52, a forward flow is formed in the main flow path, thereby minimizing the influence of the negative pressure and connecting to the three-way stopcock 500 for medical use. The liquid in the tube can be distributed without stagnation.

  As described above, the three-way stopcock 500 as a connector according to the present embodiment includes the third branch pipe 13 in which the opening 13b opened to the outside is formed, and the first branch pipe 11 as a connection port connected to the pipe body. And the second branch pipe 12, a housing 10 in which a flow path space through which liquid can flow through the first branch pipe 11 and the second branch pipe 12 is formed, and a valve member 40 attached to the opening 13 b. Since the valve member 40 is configured to supply liquid from the outside by opening and closing the valve member 40, and the valve member 40 has the same configuration as that of the first embodiment, the same as in the first embodiment. The effect of.

  The three-way cock 500 of the present embodiment is formed by dividing the housing 10 into a first portion 16 having an opening 13b and a second portion 17 having a first branch pipe 11 and a second branch pipe 12. The liquid in the flow path space is elastically connected to the first portion 16 and the second portion 17 through the gap between the dividing surface 16a of the first portion 16 and the dividing surface 17a of the second portion 17. The elastic means 61 is provided. For this reason, when extracting the lure part 52, a flow-path space can be made into a positive pressure, and the backflow of the liquid in the medical tube connected to a three-way cock can be suppressed.

  Note that, as shown in the present embodiment, when the luer part 52 is extracted from the opening 13b, the configuration in which the flow space space in the housing 10 is reduced to make the pressure in the flow space positive is positive. It is apparent that the present invention can be applied not only to the three-way stopcock but also to the mixed injection device shown in the third embodiment, the connector shown in the fourth embodiment, and the like.

It is a top view of the three-way cock according to the first embodiment of the present invention. It is a front view of the three-way cock according to the first embodiment of the present invention. It is a left view of the three-way cock according to the first embodiment of the present invention. It is the fragmentary sectional view which showed the AA cross section in FIG. 2 partially. It is BB sectional drawing in FIG. It is a perspective view showing typically the valve member concerning a first embodiment of the present invention. It is a figure which shows the action | operation when performing mixed injection from the 3rd branch pipe of the three-way cock concerning 1st embodiment of this invention, (a) is a state before a luer part is inserted in a valve member, (b) is (C) is a figure which shows the state which the lure part was inserted in the valve member, but the valve member is still closing, and the state where the luer part was inserted in the valve member and the valve member is open. It is the figure which imitated the operation | movement similar to FIG. It is a figure which concerns on 1st embodiment of this invention and shows the relationship between the pushing force which acts on the main-body part of a valve member, and raising force. It is a top view of the three-way cock according to the second embodiment of the present invention. It is a side fragmentary sectional view of the three-way cock according to the second embodiment of the present invention. It is a figure which shows the action | operation when performing mixed injection from the 3rd branch pipe of the three-way cock concerning 2nd embodiment of this invention, (a) is a state before a luer part is inserted in a valve member, (b) is (C) is a figure which shows the state which the lure part was inserted in the valve member, but the valve member is still closing, and the state where the luer part was inserted in the valve member and the valve member is open. It is the figure which imitated the operation | movement similar to FIG. 12 in perspective. It is a figure which concerns on 2nd embodiment of this invention and shows the relationship between the pushing force which acts on the main-body part of a valve member, and raising force. It is a figure which shows the mixed injection tool which concerns on 3rd embodiment of this invention, (a) is a front view, (b) is a top view, (c) is a side view. It is sectional drawing of the mixed injection tool which concerns on 3rd embodiment of this invention, (a) is AA sectional drawing of FIG.15 (b), (b) is BB sectional drawing of FIG.15 (a), ( (c) is CC sectional drawing of FIG.15 (b). It is a figure which shows the connector which concerns on 4th embodiment of this invention, (a) is a front view, (b) is a side view, (c) is a top view. It is sectional drawing of the connector which concerns on 4th embodiment of this invention, (a) is AA sectional drawing of FIG.17 (b), (b) is BB sectional drawing of Fig.17 (a). It is AA sectional drawing in FIG. 2 of the three-way cock according to 5th embodiment of this invention. It is BB sectional drawing in FIG. 3 of the three-way cock according to 5th embodiment of this invention. It is a figure which shows the operation state of the valve member of the three-way cock concerning 5th embodiment of this invention, (a) is the state before inserting the luer part, (b) is the state which inserted the lure part 52, ( (c) shows the state in the middle of extracting the lure part 52, (d) shows the state after extracting the luer part 52, respectively.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 ... Housing, 11 ... 1st branch pipe (connection port), 11a ... 1st branch flow path, 11b ... Opening part, 12 ... 2nd branch pipe (connection port), 12a ... 2nd branch flow path, 12b ... Opening 13, a third branch pipe, 13 a, a third branch flow path (flow path space), 13 b, an opening, 13 c, a tapered part, 13 d, a cylindrical part, 13 e, a step part, 13 f, a partition wall, 13 g, a ridge. 15 ... cylindrical part, 16 ... first part, 16a ... divided surface, 17 ... second part, 17a ... divided surface, 20 ... plug, 21 ... groove part, 22 ... groove part, 23 ... partition wall, 30 ... gripping part, 40 ... valve member, 41 ... main body, 41a ... outer surface, 41b ... inner surface, 41c ... side peripheral surface, 41d ... inner slit, 41d1 ... opening, 41e ... root portion, 41f ... first outer slit, 41f1 ... opening, 41g ... second outer slit, 41g1 ... opening, 41h First part, 41i ... second part, 42a ... first support arm (support part), 42b ... second support arm (support part), 51 ... cover, 51a ... groove, 51b ... projection, 52 ... luer part, 61 ... Elastic member (elastic means), 100 ... three-way stopcock, 200 ... three-way stopcock, 500 ... three-way stopcock,
300 ... Mixed injection tool, 310 ... Housing, 311 ... First branch pipe (connection port), 311a ... First branch flow path, 312 ... Second branch pipe (connection port), 312a ... Second branch flow path, 313 ... First Three branch pipes, 313a ... third branch flow path (flow path space), 313b ... opening, 313c ... tapered part, 313d ... cylindrical part, 315 ... central confluence part, 315a ... partition wall, 315b ... first series passage space, 315c ... second communication space,
400 ... Connector, 410 ... Housing, 411 ... Connection pipe part (connection port), 411a ... Connection flow path, 412 ... Connection pipe cover part, 413 ... Communication pipe part, 413a ... Communication space (flow path space), 413b ... Opening Part, 413c ... taper part, 413d ... cylindrical part, 451 ... cover, 451a ... dome part, 451b ... external thread part

Claims (3)

A housing having an opening opened to the outside and a connection port connected to the tube, in which a flow passage space through which liquid can flow is formed, and a valve member attached to the opening; In a connector for supplying liquid from outside into the flow path space by opening and closing the valve member,
The valve member is
An outer surface facing the outside and an inner surface facing the flow path space; and an inner slit that opens in the inner surface so as to divide the inner surface into two parts and extends in a direction from the inner surface toward the outer surface. And having a body portion that closes the opening in a liquid-tight manner and is movable to the flow path space side by an external pressing force;
By being attached to the opposing position of the outer surface of the main body so as to sandwich the surface on which the inner slit of the main body is formed, and being locked to the housing so as to suspend the main body A first support arm and a second support arm that support the main body portion and cause an elastic force to act on the main body portion when the main body portion moves to the flow path space side by external pressure .
The first support arm and the second support arm extend so that the inner slit is opened from the inner surface side by the elastic force acting on the main body portion, and is deformed to form a recess. A connector , wherein an outer surface forms a communication surface communicating with the flow path space . The connector according to claim 1, said main body portion, the formed across the forming surface of the inner slit, thereby opening said outer surface, extending in the direction toward the inner surface from the outer surface, wherein A connector characterized in that a first outer slit and a second outer slit parallel to the inner slit are formed. The connector according to claim 1 or 2 ,
The housing is formed by being divided into a first part having the opening and a second part having the connection port,
The first part and the second part are arranged so that their respective split surfaces are attached to each other,
The connector is elastic to the first portion and the second portion so that liquid in the flow path space does not leak outside through a gap between the dividing surface of the first portion and the dividing surface of the second portion. Elastic means connected to the
The connector is characterized in that the elastic member generates a contraction force so that the dividing surface of the first part is pressed against the dividing surface of the second part .

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