JP2016147077A - connector - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a connector efficiently discharging fluid stagnating in a space part.SOLUTION: A connector 10 includes, in a body 38: a first to third ports 24, 26, and 28 having passages for passing transfusion therein/thereout; an inner flow passage 52 for communicating between flow passages of the first port and the second port; and a through-hole 76 continuing from the inner passage. The inner passage includes an upstream-side wall surface 92 that can guide the transfusion flowing from the first port into the inner passage, to the through-hole and makes a cross-sectional area of a transfusion flow passage near the through-hole, narrower than the flow passage cross-sectional area of the first port.SELECTED DRAWING: Figure 4

Description

  The present invention relates to a connector for connecting a plurality of tubes, for example, in an infusion line for infusion of a patient.

  Conventionally, when performing infusion to a patient, a plurality of tubes are connected to construct an infusion line that connects from the infusion bag to the patient, and the plurality of tubes are connected via a connector. In the case of infusion, another infusion is supplied from a separate line to the main line that supplies the main infusion to the patient, and is mixed with a connector and guided to the patient. In this case, a connector having a three-way port into which a plurality of infusion agents can be mixed is used (see Patent Document 1).

  The connector disclosed in Patent Literature 1 includes a main body including first and second ports that constitute a flow path of a main line and a third port that constitutes a flow path of another line. In the inside of the third port, from the need to insert and connect a male connector of another line, at a position shifted from the internal flow path (flow path of the main line) communicating between the flow paths of the first and second ports, A space portion connected to the internal flow path is provided.

  In the space portion of the third port, there occurs a phenomenon in which an infusion agent (or air or the like) that is a fluid stagnates in a state where a male connector of another line is not connected (a closed state of the third port). Such fluid stagnating in the space (hereinafter also referred to as stagnant fluid) may cause various inconveniences particularly in medical devices.

  For example, before supplying an infusion solution to a patient, an operation of filling the infusion line with the infusion agent and extracting air is performed, but there is a possibility that air bubbles (air) may stagnate in the space, When supplying to a patient, there exists a possibility that the remaining bubble may be introduce | transduced into a patient with an infusion solution. In addition, when a highly nutritive liquid is supplied as an infusion, the liquid stagnates in the space, so that bacteria may grow in the connector and be introduced into the patient. Furthermore, when the chemical solution supplied to the patient is switched, a different chemical solution may be mixed and introduced into the patient by supplying the next chemical solution with the previous chemical solution remaining in the space.

  In order to eliminate the inconveniences as described above, the connector is configured such that a wall portion (fluid flow director) is provided on the internal flow path, whereby the infusion agent is guided to the space portion by the wall portion and the discharge of stagnant fluid is promoted. Is done.

  However, the wall part provided on the internal flow path guides the infusion agent to the space part with a relatively weak fluid force. For this reason, the infusion agent guided to the space part can affect only a part of the stagnant fluid that fills the space part, and does not sufficiently discharge the stagnant fluid from the space part. As a result, the stagnant fluid remains in the space as usual, and the above-described inconvenience may occur.

Special table 2010-505551 gazette

  The present invention has been made in view of the above circumstances, and with a simple configuration, it is possible to efficiently discharge the fluid stagnating in the space portion, thereby improving the safety of infusion, It is an object of the present invention to provide a connector that can satisfactorily supply a desired fluid.

  In order to achieve the above object, the present invention provides a main body, first to third ports provided in the main body and having flow paths through which fluid can flow in or out, and provided in the main body. An internal flow path communicating between the flow paths of the 1 port and the second port; a space portion provided in the third port; connected to the internal flow path; provided on the internal flow path; A wall that can guide the fluid that has flowed into the internal flow path from the flow path to the space, and that has a cross-sectional area of the fluid near the space smaller than that of the first port. The wall surface is provided in a bulging portion extending from the axial center of the internal flow path toward the third port side, and faces the flow path of the first port; The third port can be inserted with a male connector, and the male port While the third port is closed in a non-inserted state of the connector, the valve includes a valve body having a slit opened by the insertion of the male connector, and the connector is inserted when the male connector is inserted into the third port. A stopper portion that restricts elastic deformation of the valve body beyond a predetermined value is provided, and the stopper portion is provided closer to the third port than the bulging portion.

  In this case, it is preferable that the stopper portion is inclined at a predetermined angle with respect to the axial direction of the third port.

  Moreover, the said wall surface is good to oppose the substantially orthogonal direction with respect to the axial direction of the flow path of the said 1st port.

  Furthermore, the said bulging part has the downstream side wall surface facing the flow path of the said 2nd port, and the said downstream side wall surface continues from the upper part of the said wall surface, and goes to the bottom face of the flow path of the said 2nd port. It is preferable to be inclined.

  Furthermore, it is preferable that the upper portion of the wall surface protrudes higher than the formation height of the flow path of the first port.

It is explanatory drawing which shows roughly an example of the infusion set to which the connector which concerns on this embodiment is applied. It is a perspective view which shows the whole structure of the connector of FIG. It is a perspective view which shows the housing of the connector of FIG. It is side surface sectional drawing which shows the unconnected state of a male connector in the connector of FIG. 5A is a sectional view taken along the line VA-VA of the housing of FIG. 3, FIG. 5B is a sectional view taken along the line VB-VB of the housing of FIG. 3, and FIG. 5C is a sectional view taken along the line VC-VC of the housing of FIG. FIG. It is side surface sectional drawing which shows the connection state of a male connector in the connector of FIG. It is side surface sectional drawing which shows the housing of the connector which concerns on a modification.

  Hereinafter, the connector according to the present invention will be described in detail based on the relationship with an infusion set to which the connector can be applied. Of course, the connector is not limited to application to an infusion set.

  As described above, the connector 10 has a function of connecting a plurality of tubes 12 in an infusion line for infusion to a patient. For example, the connector 10 is applied to an infusion set 14 as shown in FIG. The infusion set 14 is constructed as an infusion line in which an upstream side is connected to an infusion bag (not shown) and a downstream side is connected to an indwelling needle (not shown), and an infusion agent is administered to the patient from the infusion bag.

  The infusion agent that circulates through the infusion set 14 includes any fluid that can be administered to a living body, such as a medicinal solution, a correction electrolyte solution, and physiological saline. When the infusion is a drug solution, for example, sedative, intravenous anesthetic, anesthetic analgesic, local anesthetic, non-depolarizing muscle relaxant, pressor, antihypertensive, coronary vasodilator, diuretic Various drugs such as antiarrhythmic drugs, bronchodilators, hemostatic agents, vitamins, antibiotics, and fat emulsions can be selected.

  In the tube 12 of the infusion set 14, for example, a drip tube 16 in which the flow rate of the infusion solution supplied from the infusion bag can be visually confirmed, a clamp 18 for adjusting the flow rate of the infusion solution, and air existing in the infusion line is discharged (or supplied). Air vent filter 20, a clamp 22 that closes the tube 12, and the like. Of course, the infusion set 14 is not limited to the configuration shown in FIG. 1. In addition to the above-described members, various members (for example, an infusion pump and a backflow prevention valve) disposed in the infusion line are used. Can be applied.

  The tube 12 of the infusion set 14 is a flexible tube and constitutes a channel for the infusion agent. When the connector 10 is applied to the infusion set 14 as described above, for example, the connector 10 is disposed between the clamp 18 and the air vent filter 20. That is, the connector 10 connects the first tube 12 a extending downstream from the drip tube 16 and the second tube 12 b extending upstream of the air vent filter 20 so as to be able to flow. The connector 10 is a three-port connector to which a third tube 12c configured as a separate line can be connected to a main line configured by the first tube 12a and the second tube 12b.

  The connector 10 is not limited to the above-described arrangement position, and can be arranged at a desired location of the infusion set 14. Further, not only one connector 10 but also a plurality of connectors 10 may be provided in the infusion set 14 (infusion line).

  Hereinafter, a specific configuration of the connector 10 according to the present embodiment will be described in detail. As shown in FIG. 2, the connector 10 includes a first port 24 to which the first tube 12a constituting the main line is connected, a second port 26 to which the second tube 12b also constituting the main line is connected, And a third port 28 to which a third tube 12c constituting another line is connected. The first and second ports 24 and 26 are provided in a housing 30 (housing) having an infusion fluid channel therein. The third port 28 includes a cap 32 (lid body), a support body 34 (see FIG. 4), and a valve body 36, which are members separate from the housing 30, and is constructed by assembling each member to the housing 30. .

  The housing 30 and the cap 32 are connected to each other so as to be configured as a main body 38 of the connector 10 having an infusion fluid flow path 38a (see FIG. 4) therein. The support body 34 and the valve body 36 are accommodated in the main body 38, and only the upper surface of the valve body 36 is exposed from the opening 40 of the cap 32.

  In the connector 10, the housing 30, the cap 32, and the support body 34 are molded from a resin material in consideration of ease of molding processing and cost reduction. As this resin material, it is preferable to apply a material that is more rigid than the tube 12, for example, polyolefins such as polyethylene, polypropylene, ethylene-vinyl acetate copolymer, polyurethane, polyamide, polyester, polycarbonate, polybutadiene, polychlorinated. Vinyl etc. are mentioned.

  As shown in FIGS. 2 and 3, the housing 30 has a bottomed cylindrical connector base 42 at the center, and the first port 24 and the second port 26 are connected to the side peripheral surface of the connector base 42. ing. The first port 24 is formed in a substantially cylindrical shape and extends linearly from the connector base 42 toward the upstream of the main line. Inside the first port 24, a first port flow path 44 through which an infusion solution can flow is extended along the axial direction.

  The first port 24 is configured as a male luer taper that gradually decreases in diameter toward the extended end, and is inserted into the tube (inner lumen) of the first tube 12a. A protrusion 46 is formed on the outer peripheral surface of the first port 24 near the connector base 42 along the circumferential direction. By causing the first tube 12a to enter until it exceeds the protruding portion 46, the first tube 12a and the first port 24 are liquid-tightly connected.

  On the other hand, the second port 26 is formed in the same shape as the first port 24 on the opposite side of the first port 24 across the connector base 42, and extends linearly from the connector base 42 toward the downstream of the main line. Yes. Inside the second port 26, a second port flow channel 48 through which the infusion agent can flow is extended along the axial direction. That is, the first and second ports 24 and 26 are formed so that their axial centers coincide with each other and are arranged in a straight line, and accordingly, the first and second port channels 44 and 48 are also communicated in a straight line. doing. The connector 10 uses the first and second port flow paths 44 and 48 connected in a straight line as the main line flow path (hereinafter referred to as the main line flow path 50), and the first infusion agent flowing through the main line flow path 50 is used as the connector 10. It can be distributed smoothly.

  The bottomed cylindrical connector base 42 has a thickness for connecting and supporting the first and second ports 24 and 26 on the side peripheral surface thereof. Inside the connector base portion 42, an internal flow path 52 that communicates between the first port flow path 44 and the second port flow path 48 is formed. The internal flow path 52 bears a part of the main line flow path 50 and extends so as to connect the main line flow path 50 linearly. In addition, a guide wall portion 54 that guides the flow of the first infusate in the vertical direction (connection direction of the cap 32) is formed in the central portion in the axial direction of the internal flow path 52. The guide wall portion 54 will be described in detail later.

  On the other hand, the upper side of the connector base 42 is configured as an attachment portion 56 for attaching the cap 32 and the support 34. The attachment portion 56 is formed by cutting out the upper surface of the connector base 42 into a circular shape, and has a circular exposure port 58 that exposes the internal flow path 52 at the center portion, and a flat exposure port 58. And a hooking wall 62 and a groove portion 64 formed on the base portion of the first and second ports 24 and 26 outside the placement portion 60. The support body 34 is disposed on the disposition portion 60, and the latching claw 66 of the cap 32 is latched to the hooking wall 62.

  The diameter of the exposure port 58 is formed larger than the width of the internal flow path 52, and the internal flow path 52 extends so as to cut out the central portion of the exposure port 58 in a groove shape. A stopper portion 59 inclined at a predetermined angle is formed between the pair of side walls 52 a, 52 a constituting the internal flow path 52 and the mouth edge of the exposure port 58. When the male connector 100 is inserted into the third port 28, the stopper portion 59 restricts the elastic deformation of the valve body 36 beyond a predetermined value so that the male connector 100 penetrates the slit 86 of the valve body 36. It has a function to prevent.

  The third port 28 is a connection terminal constituted by the cap 32, the support body 34, and the valve body 36 as described above, and is fixedly connected to the mounting portion 56, so that the first and second ports 24, 26 are connected. It is provided in a direction orthogonal to the axial direction. That is, the connector 10 is configured as a T port connector in which the branch angle of the third port 28 is 90 ° with respect to the main line flow path 50. The third port 28 is connected to the male connector 100 (insert) of the third tube 12c.

  As shown in FIG.2 and FIG.4, the cap 32 accommodates the valve body 36 inside, and is formed in the external shape which can be connected with the male connector 100 of the 3rd tube 12c. The cap 32 has a lower flange portion 68 connected to the connector base portion 42 and a terminal portion 70 extending upward from the flange portion 68 by a predetermined length.

  The flange portion 68 is formed to have an outer diameter that covers the arrangement portion 60 of the connector base 42. A pair of locking claws 66 projecting radially outward are continuously provided at a predetermined symmetrical position on the periphery of the flange portion 68 with the terminal portion 70 interposed therebetween. The pair of locking claws 66 are formed in a hook shape whose interval is slightly shorter than that of the pair of hooking walls 62, and are configured to be hooked on the hooking wall 62 by being fitted in the groove 64 of the connector base 42. .

  The terminal portion 70 is formed in a cylindrical shape having a smaller diameter than the flange portion 68, and a hole portion 72 is formed inside the terminal portion 70 along the axial direction (vertical direction). An opening 40 narrowed radially inward is formed on the upper side of the hole 72, and a diameter larger than the opening 40 is formed on the lower side of the opening 40, and the support body 34 and the valve body 36 are connected to each other. An accommodating portion 74 that can be accommodated is provided.

  The opening 40 is configured to have a predetermined inner diameter (an inner diameter into which the valve body 36 can be inserted) by being surrounded by a ring-shaped protrusion 70 a that protrudes downward from the upper edge of the terminal portion 70. . Further, on the outer peripheral surface of the terminal portion 70, a spiral protrusion 70b for screwing a luer lock type male connector is formed.

  Here, as another line of the infusion set 14, the male connector 100 of the third tube 12c connected to the connector 10 will be described with reference to FIG. As this male connector 100, for example, a male connector of a ripple ripple system standardized by ISO is applied. Specifically, the male connector 100 has an insertion cylinder 102 that is inserted into the connector 10 (cap 32).

  The insertion cylinder 102 extends linearly in the axial direction, and has a configuration in which a distal end portion (a lower end portion in FIG. 4) pushes the slit 86 of the valve body 36 when connected to the connector 10. Inside the insertion cylinder 102, a flow passage 104 is formed through which the second infusion agent supplied from the third tube 12c can flow. That is, the flow path 104 is configured as a flow path in another line (hereinafter referred to as a separate line flow path 110).

  Moreover, the outer peripheral surface of the insertion cylinder 102 is formed in the taper surface 102a diameter-reduced toward a front-end | tip part. That is, the insertion cylinder 102 is formed such that the outer diameter of the body portion at a position where a predetermined amount is inserted into the connector 10 matches the inner diameter of the opening portion 40 of the cap 32 and the outer diameter of the distal end portion is slightly smaller than that of the body portion. ing. The insertion tube 102 is connected to the third port 28 (the cap 32, the support body 34, and the valve body 36) by fitting the tapered surface 102a into the opening 40 as it advances into the connector 10.

  Of course, the male connector connected to the third port 28 is not limited to the above-described male connector 100 of the ripple wire system. For example, as shown by a broken line in FIG. 4, a connection tube 106 is provided to surround the insertion tube 102, and a spiral protrusion 108 provided on the inner peripheral surface of the connection tube 106 is screwed onto the protrusion 70 b of the cap 32. The luer lock type male connector 100A to be combined may be applied.

  On the other hand, the support body 34 of the third port 28 has a function of supporting the valve body 36 at a position spaced apart from the internal flow path 52 by a predetermined distance. That is, in the connection between the third port 28 and the male connector 100, a space for inserting the male connector 100 (insertion cylinder 102) more than a certain amount is required. The support body 34 supports the valve body 36 at an upper portion thereof, and constructs the space portion by a through hole 76 extending vertically.

  The support body 34 includes a flange portion 78 that is disposed on the disposition portion 60 of the connector base portion 42, and a support cylinder 80 that protrudes upward from the upper surface of the flange portion 78. Further, the outer diameter of the upper portion of the support cylinder 80 is constituted by a holding portion 82 formed to have a smaller diameter than the body portion, and the fixing portion 84 of the valve body 36 is fitted on the outside of the holding portion 82. ing.

  The through hole 76 is formed through the inside of the flange portion 78 and the support cylinder 80. The through hole 76 communicates with the exposure port 58 in a state where the support body 34 is disposed in the placement portion 60. The through hole 76 is configured as a flow path in the third port 28, and allows the second infusion agent to flow from the separate line flow path 110 to the main line flow path 50. That is, the flow path 38 a in the main body 38 is constituted by the first and second port flow paths 44 and 48, the internal flow path 52, and the through hole 76. The through-hole 76 allows the insertion cylinder 102 and the elastically deformed valve body 36 to move with the insertion of the insertion cylinder 102, and the through-hole 76 and the opening 40 allow displacement of the valve body 36. It is configured as a possible space.

  Unlike the other members, the valve body 36 of the third port 28 is formed of an elastic material, and has an elastic force that can be elastically deformed as the male connector 100 is inserted. The elastic material constituting the valve body 36 is not particularly limited. For example, synthetic rubber such as polybutadiene, nitrile, and chloroprene, natural rubber such as polyisoprene, urethane rubber, silicon rubber, and fluorine rubber And other thermosetting elastomers, thermoplastic elastomers, and other elastomers.

  The valve body 36 includes a slit 86 that opens and closes based on insertion and removal of the male connector 100 in the center, and has a function of communicating and blocking the separate line flow path 110 by opening and closing the slit 86. The valve body 36 is formed in a disk shape having a relatively thick film thickness, and includes an outer fixing portion 84 sandwiched between the cap 32 and the support body 34, and an inner deformation portion 88 provided continuously to the fixing portion 84. Prepare. An upper bulging portion 88 a that is inserted into the opening 40 is formed on the upper portion of the deformable portion 88.

  The slit 86 is formed so as to penetrate above and below the deformable portion 88, and is in a closed state when the upper bulged portion 88a is accommodated in the opening 40 (ie, not elastically deformed). The slit 86 gradually opens as the deformable portion 88 is displaced (elastically deformed) relative to the fixed portion 84 as the male connector 100 is pushed.

  In the state where the male connector 100 is not inserted, the third port 28 has a hollow through hole 76 below the deformable portion 88 so that the air before priming, the first infusate or the like flowing through the main line flow path 50 is present. A stagnant fluid staying in the through hole 76 is generated. Therefore, the connector 10 is provided with the guide wall portion 54 on the internal flow path 52, so that the first infusion agent flowing from the first port flow path 44 is guided to the through hole 76 side and the stagnant fluid is discharged. It is configured. Hereinafter, the configuration of the internal flow path 52 and the guide wall portion 54 will be described more specifically.

  As shown in FIG. 3 and FIG. 5A to FIG. 5C, the internal flow path 52 is a passage formed in a substantially rectangular cross section and extending in the axial direction, and a first circular cross section extending into the connector base 42. In addition, the upper port side is opened by the exposure port 58 while continuing to the second port channels 44 and 48. The internal flow path 52 has a pair of side walls 52a, 52a and a bottom wall 52b extending along the axial direction, and serves as a boundary between the first and second port flow paths 44, 48 at both axial ends. End walls 52c and 52c are provided. The end wall 52c of the internal flow path 52 has an area larger than the cross-sectional area of the first and second port flow paths 44 and 48, and the first and second port flow paths 44 and 48 are formed at the center ( Drilled).

  The guide wall portion 54 is formed so as to divide the internal flow path 52 in the axial direction (that is, upstream and downstream). The guide wall portion 54 is configured by a bulging portion 90 formed thick on the first port 24 side from the axial central portion of the internal flow path 52. The bulging portion 90 is connected to a pair of side walls 52 a and 52 a and a bottom wall 52 b that constitute the internal flow path 52. Further, the bulging portion 90 protrudes upward from the bottom wall 52b beyond the positions where the first and second port flow paths 44 and 48 are drilled. The central bottom portion of the stopper portion 59 is formed so as to be continuous with the upper surface of the bulging portion 90.

  An upstream side wall surface 92 that guides the first infusion agent flowing in from the first port channel 44 to the through hole 76 is provided on the bulging portion 90 on the first port channel 44 side. On the 48 side, a downstream side wall surface 94 that guides the first infusate or stagnant fluid that has flowed into the through hole 76 to the second port channel 48 is formed. Further, the upstream side wall surface 92 is formed with a notch groove 96 (notch portion) in which a central portion in the width direction is notched upward.

  The upstream side wall surface 92 is erected near the boundary (end wall 52 c) between the first port channel 44 and the internal channel 52. The upstream side wall surface 92 is formed in a flat shape surrounding the notch groove 96 and is orthogonal to the axis of the first port channel 44. Therefore, an inflow space having a sufficiently small volume is constituted by a pair of side walls 52a, 52a, a bottom wall 52b, an end wall 52c, and an upstream side wall surface 92 at a location where the internal channel 52 communicates with the first port channel 44. 53 is formed.

  The inflow space 53 is a first infusate channel interposed between the first port channel 44 and the through hole 76, and the inflow space 53 has a cross-sectional area S <b> 2 with respect to the cross-sectional area S <b> 1 of the first port channel 44. By being narrow, it has a function of causing the first infusion to flow into the through-holes 76 vigorously. That is, the upstream side wall surface 92 of the bulging portion 90 is erected in the vicinity of the end wall 52c, thereby making the cross-sectional area S2 of the inflow space 53 sufficiently narrow. In particular, the upper side of the upstream side wall surface 92 protrudes beyond the formation height of the first port flow path 44, faces the end wall 52 c, and the cross-sectional area S 2 near the through hole 76 of the inflow space 53 is narrow. It has become.

The ratio of the cross-sectional area S1 of the first port channel 44 and the cross-sectional area S2 of the inflow space 53 is not particularly limited. For example, the ratio of the cross-sectional area S2 to the cross-sectional area S1 is set to 75% or less. Good. For example, in the case of the connector 10 in which the inner diameter φ (diameter) of the first port channel 44 is 2 mm, the interval D between the end wall 52c and the upstream side wall surface 92 is set to about 0.8 mm. In this setting, the cross-sectional area S1 of the first port channel 44 is 3 mm ² or more, and the cross-sectional area S2 of the inflow space 53 is about 2 mm ² . By establishing such a relationship, the flow rate can be sufficiently increased without causing the first infusate flowing into the inflow space 53 from the first port flow path 44 to be squeezed. The momentum of the first infusate guided inside is greatly increased.

  Further, the cutout groove 96 is formed by cutting out the bulging portion 90 to the vicinity of the central portion in the axial direction of the internal flow path 52 in a side view (see FIG. 5B), and smoothly from the upper surface of the bulging portion 90. A continuous curved surface is drawn and connected to the lower portion of the upstream side wall surface 92. That is, the notch groove 96 has an opening 96 a on the upper surface of the bulging portion 90 and an opening 96 b on the upstream side wall surface 92. This notch groove 96 has a function of guiding the first infusate that has flowed into the inflow space 53 into the flow passage 104 of the insertion tube 102 when the connector 10 and the male connector 100 are connected.

  The width W of the notch groove 96 connected to the upstream side wall surface 92 is preferably set as appropriate in consideration of the size of the connector 10 and the flow rate of the first infusate, and in particular, the opening ( It is good to form narrower than inner diameter (phi) (refer FIG. 5C). Thereby, the cross-sectional area in the notch groove 96 becomes narrow, and when the connector 10 and the male connector 100 are not connected, a part of the first infusate flowing into the inflow space 53 from the first port channel 44 is cut. Although directed toward the notch groove 96, the flow velocity of this part is increased along the notch groove 96. In addition, the flow rate of the other part of the first infusate is increased by the inflow space 53 (upstream side wall surface 92). Therefore, the first infusion is vigorously guided to the through hole 76.

  In addition, when the first infusate having a high viscosity is circulated through the connector 10, the first infusate flows in the first port flow path 44 at a high speed on the axial center side and at a low speed on the inner surface side. However, when the first infusion agent flowing on the inner surface side of the first port flow path 44 flows into the inflow space 53, it just faces (collises) with the upstream side wall surface 92, and the narrow cross-sectional area of the inflow space 53. The flow rate is easily increased by S2.

  On the other hand, the downstream side wall surface 94 of the bulging portion 90 provided on the opposite side of the upstream side wall surface 92 is formed in a tapered shape, and flows through the through hole 76 or the flow passage 104 of the insertion cylinder 102. The infusion agent can be smoothly guided to the second port channel 48. Of course, the shape of the downstream side wall surface 94 is not particularly limited. For example, the downstream side wall surface 94 may be formed on a wall surface orthogonal to the axis of the second port channel 48.

  The connector 10 according to the present embodiment is basically configured as described above, and its operation and effects will be described below. First, the case where only the first and second tubes 12a and 12b are connected to the connector 10 without connecting the third tube 12c will be described in detail with reference to FIG.

  That is, in the connector 10, the first tube 12 a is connected to the first port 24, the second tube 12 b is connected to the second port 26, and the third port 28 is closed by the valve body 36. . Therefore, the through hole 76 in the third port 28 has a large volume of the space portion below the valve body 36.

  The first infusion agent flowing through the main line flows into the first port 24 from the first tube 12a. The first infusion solution moves linearly in the connector base 42 through the first port channel 44 and flows into the inflow space 53 on the upstream side of the internal channel 52. The movement is guided upward (on the third port 28 side) by the upstream side wall surface 92 standing on the internal flow path 52.

  As described above, the cross-sectional area S2 of the inflow space 53 is formed to be narrower than the cross-sectional area S1 of the first port channel 44. Therefore, the flow rate of the first infusion agent that has flowed into the inflow space 53 from the first port flow path 44 is increased in the inflow space 53. Accordingly, the first infusion agent flows vigorously from the inflow space 53 toward the through hole 76, and a large flow (fluid turbulence) occurs in the entire fluid (including the first infusion agent and the stagnant fluid) in the through hole 76. Give rise to

  In other words, the first infusion that has flowed into the through-holes 76 flows evenly into the through-holes 76 and promotes stirring of the internal fluid. Therefore, even if a stagnation fluid exists in the through-hole 76, the stagnation fluid is stirred and easily mixed with the first infusate. This first infusion moves to the downstream side of the internal flow path 52 beyond the bulging portion 90 from the through hole 76 in a state containing the stagnant fluid. Thereby, the stagnant fluid is easily discharged from the through hole 76.

  The first infusate that has been moved from the through hole 76 to the internal channel 52 flows smoothly into the second port channel 48 along the inclined downstream side wall surface 94. Then, the first infusion is supplied into the second tube 12b through the second port channel 48 and is administered to the patient from the second tube 12b.

  Next, with reference to FIG. 6, the case where the 1st-3rd tubes 12a-12c are connected to the connector 10 is explained in full detail. In the connected state of the third port 28 and the male connector 100, the insertion cylinder 102 pushes the deformed portion 88 of the valve body 36 into the lower side of the through hole 76. Thereby, the deforming portion 88 is elastically deformed (displaced) until it is regulated by the stopper portion 59 above the bulging portion 90. For this reason, the bottom surface of the deforming portion 88 is displaced to a position close to the bulging portion 90, and the upper portion of the inflow space 53 is substantially closed by the deforming portion 88. On the other hand, the slit 86 formed in the deformable portion 88 is in an open state at the central portion in the axial direction of the internal flow path 52 due to the elastic deformation of the deformable portion 88.

  In the cutout groove 96 cut out to the center in the axial direction of the bulging portion 90, the opening 96a on the upper surface side partially overlaps (opposes) the slit 86. Therefore, the first infusion agent that has flowed into the inflow space 53 from the first port channel 44 enters the notch groove 96 from the opening 96 b in the upstream side wall surface 92, and flows through the insertion cylinder 102 along the notch groove 96. It flows into the path 104. At this time, the notch groove 96 is formed to be narrower than the first port flow path 44, so that the flow rate of the first infusate can be increased, and the first infusate is vigorously moved to the flow passage 104. Let it flow.

  Since the second infusion agent is supplied to the flow passage 104 via the third tube 12 c, the first infusion agent and the second infusion agent easily merge in the flow passage 104. Then, based on the fluid flow, the mixed first and second infusion agents flow from the flow path 104 to the downstream side of the internal flow path 52, and smoothly flow into the second port flow path 48 along the downstream side wall surface 94. Guided and further administered to the patient via the second tube 12b.

  As described above, according to the connector 10 according to this embodiment, the cross-sectional area S2 near the through-hole 76 is provided with the upstream side wall surface 92 that is narrower than the cross-sectional area S1 of the first port flow path 44. S2 can increase the momentum of the first infusate from the narrow inflow space 53 toward the through hole 76. For this reason, in the through hole 76, the flow of the fluid can be promoted by the first infusion agent with increased momentum, and the stagnant fluid can be easily discharged from the through hole 76. Thereby, the connector 10 can improve the safety | security of an infusion greatly, and can administer an infusion agent favorably to a patient.

  In this case, since the upstream side wall surface 92 faces the first port flow path 44, the cross-sectional area is increased on the internal flow path 52 without greatly changing the shape or the like in the connector 10 (internal flow path 52). The narrow inflow space 53 can be easily formed. Since the upstream side wall surface 92 is opposed in the direction substantially orthogonal to the axial direction of the first port channel 44, the upstream side wall surface 92 can be disposed near the first port channel 44. The first infusate that has flowed out of the first port channel 44 can be easily guided to the through hole 76.

  Further, the connector 10 has a notch groove 96 that is continuous with the upstream side wall surface 92 and is cut out toward the central portion in the axial direction of the internal flow path 52, thereby forming an inflow space 53 by the upstream side wall surface 92. In addition, the separate line flow path 110 of the male connector 100 and the main line flow path 50 (internal flow path 52) can be easily communicated with each other through the notch groove 96. Thereby, even in the state where the male connector 100 is connected to the connector 10, the first infusion agent that has flowed from the first port 24 can be smoothly distributed to the second port 26.

  Further, the upstream side wall surface 92 extends from the bottom wall 52 b of the internal flow path 52 to the vicinity of the bottom surface of the valve body 36 that has displaced the through hole 76, whereby the male connector 100 is connected to the third port 28 and the valve body 36. In a state in which is displaced, the inflow space 53 is substantially closed by the valve body 36. For this reason, the first infusate that has flowed into the inflow space 53 is smoothly guided to the flow passage 104 by increasing the flow velocity by the notch groove 96.

  In addition, the guide wall part 54 provided in the connector 10 which concerns on this embodiment is not limited to the structure mentioned above, Of course, various structures can be applied. For example, as shown in FIG. 7, the guide wall 54 </ b> A may be formed with a notch groove 97 in the bulging portion 90 that is shallower than the notch groove 96 according to the present embodiment. That is, the opening 97a of the cutout groove 97 on the upper surface side of the bulging portion 90 is formed at the same position as the opening 96a according to the present embodiment, but the opening 97b of the cutout groove 97 formed in the upstream side wall surface 92. Is cut out to an approximately middle portion in the height direction of the upstream side wall surface 92. Therefore, the flat portion of the upstream side wall surface 92 can be widened, and the first infusate flowing from the first port channel 44 can be well received by the upstream side wall surface 92 and can flow upward. Become. Thereby, the first infusion agent flowing into the inflow space 53 can be guided to the through hole 76 more vigorously.

  In the above description, the present invention has been described with reference to preferred embodiments. However, the present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the scope of the present invention. Yes.

DESCRIPTION OF SYMBOLS 10 ... Connector 24 ... 1st port 26 ... 2nd port 28 ... 3rd port 36 ... Valve body 38 ... Main body 52 ... Internal flow path 59 ... Stopper part 86 ... Slit 90 ... Swelling part 92 ... Upstream side wall surface 94 ... Downstream Side wall surface 100 ... Male connector

Claims (5)

The body,
First to third ports provided in the main body and having flow paths through which fluid can flow in or out;
An internal flow path provided in the main body and communicating between the flow paths of the first port and the second port;
A space provided in the third port and connected to the internal flow path;
The fluid that is provided on the internal flow path and that flows into the internal flow path from the first port can be guided to the space portion, and the flow path cross-sectional area of the fluid near the space portion is A connector having a wall surface that is narrower than the cross-sectional area of the flow path,
The wall surface is provided in a bulging portion extending from the axial center of the internal flow path toward the third port side, and is opposed to the flow path of the first port;
The third port includes a valve body that can be inserted with a male connector and has a slit that is opened by inserting the male connector while closing the third port in a non-inserted state of the male connector,
The connector includes a stopper portion that restricts elastic deformation of the valve body beyond a predetermined level when the male connector is inserted into the third port.
The said stopper part is provided in the said 3rd port side rather than the said bulging part. The connector characterized by the above-mentioned. The connector according to claim 1, wherein
The connector is characterized in that the stopper portion is inclined at a predetermined angle with respect to the axial direction of the third port. The connector according to claim 1 or 2,
The said wall surface is facing the substantially orthogonal direction with respect to the axial direction of the flow path of the said 1st port. The connector characterized by the above-mentioned. In the connector according to any one of claims 1 to 3,
The bulging portion has a downstream side wall surface facing the flow path of the second port;
The said downstream side wall surface is inclined toward the bottom face of the flow path of the said 2nd port while continuing from the upper part of the said wall surface. The connector characterized by the above-mentioned. In the connector according to any one of claims 1 to 4,
The upper part of the said wall surface protrudes rather than the formation height of the flow path of the said 1st port. The connector characterized by the above-mentioned.

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