JP4552639B2 - Medical connector - Google Patents

Description

  The present invention relates to a medical connector, and more particularly, to a medical connector configured so that a luer, a cannula, and the like can be inserted and removed at one end thereof.

  Intravenous nutrition, blood transfusion, blood collection, etc., between an in-vessel catheter inserted into a patient's blood vessel and an infusion port, syringe, etc. for storing fluid such as blood, infusion, etc. There may be a medical connector called. This type of medical connector includes a flow channel tube through which fluid such as high-calorie infusion and blood flows, and a storage part in which medical fluid is stored such as the infusion bag and syringe at one end thereof Tube members such as lures and cannulas that are connected to each other are detachable. This medical connector is disposed at one end of an extension tube that can be connected to, for example, the aforementioned intravascular catheter.

  One end of the flow channel tube is covered with a septum in which a slit into which a tube member such as a luer or a cannula is inserted, and the medical fluid from the reservoir is in a state where the tube member is inserted into the slit. It is configured to be transfused into the body of the patient or blood collected from the patient's body.

  As an example of a medical connector used in the above-described case, Patent Document 1 discloses an example of a connector (injection site) and a cannula device arranged between a puncture needle and a cannula, a lure, etc. when collecting blood from a patient. Has been. Hereinafter, the related art will be described.

FIG. 10 is a cross-sectional view of a connector according to the prior art.
As shown in the figure, the connector 900 is such that one end of the flow channel tube 910 is closed by a septum 920 made of an elastic body such as rubber having a slit 921, and the other end of the flow channel tube 910 is For example, it is attached via an extension tube (both not shown) to an intravascular indwelling catheter punctured into a patient's blood vessel. The medicinal solution is injected into the channel tube 910 from a cannula 990 inserted into the slit 921 of the septum 920 and infused into the patient through the other end of the channel tube 910.

  Here, when the cannula 990 is pulled out of the septum 920 at the time when the infusion is completed, it is automatically controlled by the elastic force of the septum 920 so that microorganisms such as bacteria enter the lumen 930 of the channel tube 910 from the outside and do not grow. In particular, the slit 921 is closed (see Patent Document 1).

  Thereby, even if the cannula 990 is pulled out, the inner lumen 930 of the connector is not exposed to the outside air, so that the ingress of microorganisms can be suppressed and the proliferation thereof can be suppressed.

Japanese Patent Laid-Open No. 2002-191583

  In the conventional connector 900, the septum 920 is bent in the insertion direction as the cannula 990 is inserted, and the bent septum 920 presses the cannula 990 as it is and the cannula 990 cannot be inserted smoothly, so that the bent septum 920 is stored. By doing so, the width of the lumen 930 is secured wide for the purpose of reducing the insertion resistance of the cannula 990.

  Therefore, a part of the medical fluid discharged from the cannula 990 stays in the region 932 on the septum 920 side in the lumen 930 and tends to stagnate. Even if the drug solution once retained in the region 932 is withdrawn once from the cannula 990 and inserted the cannula 990 again at the next infusion to inject the drug solution, the region 932 is separated from the tip of the cannula 990. Therefore, it is difficult to replace the newly injected chemical solution. Therefore, in the region 932, there is a possibility that microorganisms will grow when microorganisms slightly enter and the chemical solution is a fat emulsion or the like suitable for the growth of microorganisms.

  Further, the point that the region 932 is difficult to be replaced with the chemical solution in this manner may cause a problem even during blood collection. In general, after blood is collected by inserting a cannula or lure into a medical connector, heparin solution or the like is injected and washed to prevent blood from coagulating into the lumen or the like. There is a risk that blood will remain without being sufficiently replaced by the injected heparin solution, where microorganisms may grow.

  The inventor of the present application has already filed a patent application for a mixed injection port provided with a circulating portion for circulating the fluid to the septum side in the flow channel pipe in order to prevent the fluid from staying in the region 932 as described above ( International application number PCT / JP2004 / 009732).

  However, a plate-shaped reflux plate portion as the above-described reflux portion and a reflux portion in a flow path tube having a lumen for accommodating a septum deformed by insertion of a luer or the like and a narrow tube portion narrower than the lumen. In the case of a configuration including a holding portion held in a narrow tube (see, for example, FIG. 4 of the international application), the occurrence of fluid stagnation and turbulence below the holding portion becomes a problem. This problem may occur both when the medical fluid is infused from the upstream side and when the fluid flows from the downstream side due to blood collection or the like.

  The present invention has been made in view of the above-described problems, and in the case where a circulating portion for circulating fluid to the septum side is provided, medical fluid, blood, and the like on the downstream side of the circulating portion are provided. It aims at providing the medical connector which can suppress generation | occurrence | production of stagnation and a turbulent flow.

  In order to solve the above problems, the medical connector according to the present invention is the medical connector in which one end of the flow channel tube is closed with a septum in which a slit into which a tube member is inserted is formed. The pipe is provided with a circulating portion for circulating a fluid toward the septum, and the flow path pipe is closed by the septum and accommodates a septum that is deformed by the insertion of the pipe member. And a thin tube portion communicating from the lumen to the other end of the flow channel tube, and the circulating portion is disposed on a step provided between the lumen and the thin tube portion. It has a reflux plate part, and the projection is provided in the said thin tube part side terminal of the said reflux plate part.

  In the above configuration, the protrusion is provided at the end of the circulating plate portion on the side of the narrow tube portion, thereby suppressing the occurrence of turbulence due to a sudden change in the cross-sectional area of the flow path and the occurrence of fluid stagnation. The By suppressing the generation of turbulent flow, it is also possible to suppress a decrease in the flow rate of the fluid flowing from the side of the pipe member inserted into the slit to the downstream side of the flow path pipe.

That is, the circulating portion causes the fluid flowing from the tube member side to the downstream side to circulate to the septum side, and the protrusion is turbulent or stagnation of fluid on the downstream side of the flow channel tube of the circulating plate portion. Occurrence can be suppressed.
Further, the circulating portion causes the fluid flowing from the downstream side to the tube member side to circulate to the septum side, and the protrusion suppresses the occurrence of fluid stagnation on the downstream side of the flow channel tube of the circulating plate portion. You can also

  If the projection has a configuration in which the horizontal cross-sectional area gradually decreases toward the downstream side, for example, blood stagnation from the downstream side during blood collection or the like can be suppressed. The protrusion may be streamlined, and may be suitable for both the case where the protrusion flows from the downstream side and the case where the protrusion flows from the pipe member side.

  It should be noted that the shape and the like of the projection can be various forms such as a conical shape, a hemispherical shape, and an intermediate shape depending on the cross-sectional area of the thin tube portion (the shape of the inner wall of the thin tube portion). The reflux portion can be placed as a separate member in the flow channel tube, but can be formed integrally with the flow channel tube depending on the size of the medical connector. Examples of the tube member include the aforementioned luer and cannula.

  A substantially cylindrical posture restriction portion that is loosely inserted into the narrow tube portion is provided on the back surface of the reflux plate portion, and the projection is provided at the other end of the flow passage tube on the posture restriction portion. You can also. From the viewpoint of suppressing turbulent flow, it is preferable that the step portion that can be formed between the bottom surface of the end of the substantially cylindrical posture regulating portion and the protrusion is small, but there may be a slight step. However, it is more preferable to smooth the boundary portion between the posture regulating portion and the protrusion in order to prevent blood coagulation from occurring at the step portion during blood collection or the like.

  In addition, it is preferable that the said circulation part is provided with the edge part protruded so that the inner surface of the standing part may become a smooth curved surface toward the said septum side from the edge of the said circulation plate part. This is because by making the inner surface of the rising portion a smooth curved surface, it is possible to prevent the fluid from bouncing back at the rising portion of the edge portion.

  In addition, when the end face of one end of the flow path pipe closed by the septum or the insertion hole into which the pipe member is inserted is elliptical, the slit may be formed along an elliptical minor axis. preferable. This is because when the tube member is inserted into the slit, the pressing force from the major axis direction is stronger, so that the sealing inside the lumen can be improved.

  Further, the septum may be configured such that an annular rib provided so that at least a part of the outer peripheral side and the tip of the septum is in contact with the inner wall surface of the lumen is formed integrally. preferable. In the medical connector, fluid retention is particularly a problem between the back surface of the bent portion of the septum deformed to the lumen side by insertion of a tube member such as a lure, and the wall surface of the lumen immediately below the septum. Since the extremely small gap region is generated, the annular rib as described above is provided so as to fill the extremely small gap region, and it is possible to prevent the occurrence of a region where fluid tends to stay. It is.

  According to the medical connector according to the present invention, since the protrusion is provided on the narrow tube portion side end of the reflux plate portion, turbulent flow due to a sudden change in the cross-sectional area of the flow path and occurrence of fluid stagnation are prevented. There exists an effect that it can control.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
(Overall configuration of mixed injection port)
FIG. 1 is an exploded perspective view of a mixed injection port as an example of a medical connector according to an embodiment of the present invention, and FIG. 2 is a cross-sectional view of the mixed injection port. In addition, in the “cross-sectional view” in this specification, in order to facilitate understanding of the drawing, there is a portion in which a background portion of the cross-section is omitted and only an end face is shown.

  As shown in FIG. 1, the co-injection port includes a flow channel tube part 110, a cap part 120, a septum 130, and a circulation part 140. In the channel tube portion 110, the circulating portion 140 is inserted into the inner lumen 114, and the cap portion 120 is locked to one end portion via the septum 130 so as to seal the opening of the inner lumen 114. Fixed. Hereinafter, the side where the cap portion 120 is disposed in the flow path pipe portion 110 is referred to as “upstream side”, and the other side (lower side in FIG. 1) is referred to as “downstream side”.

  The channel tube portion 110 is made of, for example, polycarbonate, and includes a leg portion 111 and a trunk portion 112 as shown in FIG. As shown in FIG. 2, the inner cavity 114 is formed so as to communicate with the narrow tube section 117 that passes through the leg 111 and is narrower than the inner cavity 114. In the mixed injection port of the present embodiment, the inner diameter of the lumen 114 is about 4.5 mm or more. This secures an area for accommodating the septum 130 deformed toward the lumen 114 when the luer 190 (see FIG. 4) is inserted, thereby facilitating the insertion of the luer 190 and the lure 190 by the deformed septum 130. This is to improve the fixing property.

  In addition, the inner diameter of the narrow tube portion 117 of the present embodiment is about 2.8 mm at the widest most upstream portion and about 1.5 mm at the most downstream portion, and the protrusion 149 disposed on the most downstream side of the circulating portion 140. Is a region where the inner diameter of the narrow tube portion 117 is gradually reduced (see FIG. 2). However, the size of the mixed injection port is not limited to these.

  A tube (not shown) is inserted into the outer periphery of the leg 111. On the other hand, a tube member such as a luer 190 (see FIG. 4) and a cannula is inserted into the lumen 114 via a slit 131 provided in the septum 130, and when a fluid such as a chemical solution is injected therefrom, the lumen 114 is inserted. The fluid passes through the narrow tube portion 117 and is infused to the patient via the tube. Further, when blood is collected, fluid such as blood flowing through the tube flows to the side of the tube member such as the luer 190 through the narrow tube portion 117 and the lumen 114.

  An annular protrusion 118 (see FIG. 2) for regulating the position of the circulating portion 140 is formed on the inner peripheral wall of the lumen 114 in the channel tube portion 110, and the cap portion 120 is engaged on the outer periphery on the lumen 114 side. A pair of engaging projections 113 for stopping and fixing is formed (see FIGS. 1 and 2).

  The cap portion 120 is formed of, for example, polyacetal, and is configured by a pair of engagement portions 122 having engagement holes 123 protruding from a disk-like member provided in the center with an insertion hole 121 facing the slit 131 of the septum 130. ing. Then, the engagement hole 123 engages with the engagement protrusion 113 of the flow channel tube part 110, so that the septum 130 is locked and fixed to the flow channel tube part 110.

  As shown in FIG. 1, the septum 130 is formed of an elastic body made of disc-shaped isoprene rubber, silicon rubber, or the like, and a slit 131 is formed at the center thereof. Then, the cap portion 120 is fixed to the end portion of the flow path pipe portion 110 on the side of the lumen 114 so as to close the lumen 114. The slit 131 is normally closed by being pressed by the elastic force of the septum 130, but when the luer 190 is inserted, the septum 130 in the vicinity of the slit 131 is bent in the insertion direction and opened while maintaining a substantially sealed state. It is like that.

  The circulating portion 140 is made of a hard plastic such as polycarbonate, and is placed on a step portion between the lumen 114 and the thin tube portion 117. The recirculation part 140 obstructs the flow of a fluid such as a chemical solution injected from the luer 190 or a fluid such as blood flowing from the thin tube part 117 when collecting blood, and bypasses it to the septum 130 side. In FIG.

(Structure of the circulation part 140)
Next, the detailed configuration of the circulating portion 140 will be described. FIG. 3 is a perspective view showing an example of the configuration of the circulating portion 140. Hereinafter, description will be made with reference to FIG. 4 which is a cross-sectional view showing a state in which the luer 190 is inserted into the mixed injection port.

  As shown in FIG. 3, the circulation portion 140 includes a substantially round plate-shaped circulation plate portion 141 having a smoothly rising edge, a substantially cylindrical posture regulating portion 142 projecting from the center of the bottom surface of the circulation plate portion 141, and a posture. And a protrusion 149 provided below the restricting portion 142.

  The reflux plate portion 141 includes a disc portion 143 having an outer diameter substantially the same as the diameter of the lumen 114, and an edge portion raised at the outer peripheral portion so that the inner surface forms a smooth curved surface. 144. In this embodiment, the inner edge 144 has an inner diameter of about 5.4 mm, and the edge 144 has a height of about 2.4 mm. The upper end portion of the edge portion 144 forms a smooth curved surface in the outer peripheral direction, and the position of the reflux portion 140 is regulated by the annular protrusion 118 provided so as to slightly protrude from the outer periphery of the edge end portion 144. Is done. The circulating portion 140 is mounted and fixed by forcibly fitting the circulating plate portion 141 in the lumen 114.

  The circular plate portion 143 has a circular groove 1431 formed in a plan view in the center, four grooves 1432 radially extending from the groove 1431 toward the edge portion 144, and the circular plate portion 143. A groove 1443 (see FIG. 4) similar to the groove 1432 is formed at a position facing the groove 1432 on the back surface of the substrate.

  In the edge portion 144, grooves 1441 extending in the direction of the septum 130 from the respective grooves 1432 in the disc portion 143 are formed on the inner peripheral surface thereof. On the other hand, a groove 1442 is formed at a position facing the groove 1441 on the outer peripheral surface of the edge portion 144.

  The attitude restriction part 142 has a substantially cylindrical shape and is provided on the back surface side (downstream side) of the circulation plate part 141. The posture regulating part 142 is provided in order to prevent erroneous mounting in the upside down direction when the circulating part 140 is placed in the lumen 114 when the mixed injection port is assembled. However, the groove 1421 connected to the groove 1443 formed on the back surface of the disk portion 143 is formed on the peripheral surface of the posture restricting portion 142 so that the fluid flow is not delayed due to the presence of the posture restricting portion 142. It is formed to extend in the axial direction. A gap is provided as a whole between the outer periphery of the posture regulating portion 142 and the inner wall of the narrow tube portion 117, but the presence of the groove 1421 makes it possible to make the fluid flow more smooth.

  As shown in FIG. 4, the fixed position of the circulating portion 140 stops when the luer 190 is inserted into the inner cavity 114 through the septum 130, and the tip of the luer 190 comes into contact with the disk portion 143. It is preferable that the position be close to the tip.

  By arranging the circulation portion 140 at such a position, when a fluid such as a chemical solution is injected from the lure 190 into the inner cavity 114, the fluid hits the groove 1431 shown in FIG. 3 and advances along the groove 1432. The direction is changed as described above, and proceeds upward along the edge portion 144 raised smoothly from the outer periphery of the disc portion 143. The maximum width of the groove 1431 is preferably smaller than the maximum width of the luer 190 so that the tip of the luer 190 is in contact with the bottom surface of the groove 1431 and does not prevent fluid injection.

  The fluid that has traveled upward in the groove 1441 provided in the inner wall of the edge portion 144 is blown up to a region 1141 on the septum 130 side in the lumen 114 shown in FIG. In this way, the circulating portion 140 obstructs the flow of the fluid injected from the luer 190 and causes the fluid to circulate to the septum 130 side, so that even when the luer 190 is temporarily removed at the end of the fluid injection, it remains in the region 1141. The fluid is reliably replaced with new fluid at the next fluid injection.

  The fluid blown up in the regions 1141 and 1142 is bounced back by the septum 130 or the like and descends toward the groove 1442 that becomes a gap between the circulating portion 140 and the wall surface of the inner cavity 114, and from there, the grooves 1442, 1443, and 1421. Are sequentially passed to the narrow tube portion 117 and finally infused by the patient (see FIG. 4).

  As described above, by arranging the circulating portion 140, replacement of the fluid remaining in the regions 1141 and 1142 where it has been difficult to replace the conventional fluid can be promoted. This circulating portion 140 also has a suitable effect when a fluid flows from the narrow tube portion 117 side of the flow channel tube portion 110, such as when circulating blood extracorporeally. For example, in the case of extracorporeal circulation, it is possible to avoid blood stagnation and coagulation by circulating the blood flowing in from the narrow tube portion 117 side to the septum 130 side. In this case, the circulating portion 140 plays a role of circulating the fluid flowing in from the narrow tube portion 117 toward the septum 130 and guiding it to the tip portion of the luer 190 or the like.

  Now, the protrusion 149 provided on the most downstream side of the posture restricting portion 142 causes the posture restriction when the fluid injected from the tube member such as the luer 190 flows along the outer periphery of the posture restricting portion 142 via the lumen 114. It has the effect | action which suppresses that a turbulent flow generate | occur | produces in the fluid which flowed along the outer periphery of the part 142. FIG. If the cross-sectional area of the fluid flow path suddenly changes in the most downstream portion of the attitude regulating portion 142, the flow rate of the fluid may be reduced due to the occurrence of turbulence, but the flow rate may be reduced due to the provision of the protrusion 149. It is suppressed.

  The shape of the protrusion 149 or the shape of the boundary portion between the protrusion 149 and the posture restricting portion 142 is not particularly limited, but the cross-sectional area of the fluid flow path between the protrusion 149 and the inner wall of the thin tube portion 117 is A configuration that does not change suddenly over the entire direction is considered preferable, and a step is not provided between the protrusion 149 and the attitude regulating portion 142, and a smooth curved surface is preferable as shown in FIG.

  The cross-sectional area of the fluid flow path between the projection 149 and the inner wall of the narrow tube portion 117 does not always have to be constant, and may be gradually increased or decreased, and a step between the projection 149 and the posture regulating portion 142 may be used. Even if there is, it is permissible as long as it does not cause turbulence. These forms can be changed depending on the application, the type of fluid, and the like.

  On the other hand, the provision of the protrusion 149 is also suitable when a fluid flows from the thin tube portion 117 side, such as blood collection. This is because if the protrusion 149 is not provided below the substantially cylindrical posture regulating portion 142, there is a possibility that stagnation or coagulation of fluid such as blood may occur below the posture regulating portion 142. By providing the protrusions 149, blood stagnation and coagulation during blood collection can be suppressed. For example, in the case of blood collection, if there is a step at the boundary between the posture regulating portion 142 and the protrusion 149, blood coagulation may occur at the step, as shown in FIG. A smooth shape is preferred.

(Application example)
Here, an example of an infusion method (fluid transfer method) in the case of infusion by applying the medical connector such as the mixed injection port described in the above embodiment will be described. This application example can be similarly applied to the medical connector described in the following modification.

  For example, when central venous nutrition is performed on a patient using the medical connector of the present invention, an extension tube is connected to a central venous catheter placed in the patient's blood vessel. The medical connector of the present invention is connected to the other end of the extension tube. More specifically, the tube constituting the extension tube is inserted into the leg portion 111 of the medical connector.

  In central parenteral nutrition, intermittent infusion may be used to allow patients to be treated at home or to return to society. In this therapy, the necessary amount of infusion per day is administered in 8 to 12 hours, and the infusion is interrupted for the remaining time. When the infusion is interrupted, flushing is performed with heparin, physiological saline or the like, but if the flushing is insufficient due to retention, the risk of infection due to microbial growth increases.

  When collecting blood from a patient, a tube is connected to a central venous catheter placed in the patient's blood vessel, and the other end of the tube is inserted into the leg 111 of the connector of the present invention. The connector is used by inserting a lure for blood collection into a slit 131 formed in the septum, and pulls out the lure after blood collection. Thereafter, in order to prevent the collected blood from coagulating in the lumen 114, a lure is inserted into the slit 131 again, and the inside of the lumen 114 is flushed with heparin, physiological saline, or the like.

  As described in the above embodiment, when the connector according to the present invention is used, the lumen is efficiently cleaned by the flash cleaning process, and the residual fluid such as high calorie infusion and blood is prevented. Proliferation of microorganisms in the gap between the septum and the inner wall of the lumen 114 can be prevented more reliably. Note that the above application examples can be effectively applied to animals other than humans.

(Modification)
Although the embodiments of the present invention have been described above, the contents of the present invention are not limited to the specific examples described in the above embodiments, and for example, the following modifications can be considered. .

  (1) In the above-described embodiment, the case where the posture regulating portion 142 is provided on the downstream side of the circulating plate portion 141 has been described. There is no particular restriction on the vertical length of the posture regulating unit 142, but a configuration in which the posture regulating unit 142 is not provided is also possible. FIG. 5 is a cross-sectional view illustrating an example of a configuration in the case where the posture regulation unit 142 is not provided. As shown in the figure, by providing the protrusion 149 directly on the back surface side of the reflux plate portion 141, it is possible to suppress the occurrence of blood stagnation, coagulation, etc. on the back surface side of the reflux plate portion 141, particularly during blood collection.

  (2) The shape of the tip of the protrusion 149 is not necessarily limited to a smooth shape as shown in the figure, and the fluid properties from a shape that is as flat as possible to a pointed shape such as a cone as long as stagnation can be suppressed. Can also be designed accordingly.

  (3) In the above embodiment, the groove 1441 and the like are formed in the circulation plate portion 141 and the like of the circulation portion 140, but the portion where the groove is formed and the other portion are reversed to form the groove. Alternatively, the medical fluid may flow through the gap between the ribs by forming the ribs as ribs.

FIG. 6 is a perspective view showing an example of the configuration of the circulating portion 240 in the present modification.
Similar to the above embodiment, the circulating portion 240 shown in the figure includes a circulating plate portion 241 and a posture regulating portion 242 projecting from the center of the lower surface thereof, and regions 1141 and 1142 of the lumen 114 (FIG. 4). The function of suppressing the stagnation of fluid in the reference) is provided.

  The reflux plate portion 241 includes a disc portion 243 having a diameter substantially the same as the diameter of the lumen 114, and an edge portion 244 that is smoothly raised at the edge portion. In addition, a protrusion 249 is disposed below the attitude restriction unit 242.

  In the example shown in the figure, the grooves 1432, 1441, 1442, 1443, and 1421 in FIG. 3 of the above embodiment are formed in the disk portion 243, the edge portion 244, and the posture regulating portion 242 of the circulation plate portion 241. In this case, ribs 2432, 2441, 2442, 2443 (not shown) and 2421 are formed. Thereby, a groove is formed wider between the ribs than in the above-described embodiment, and the flow path resistance of the fluid is lowered. Therefore, it is considered that the medical fluid can be injected more smoothly than in the above-described embodiment while suppressing fluid retention. Further, the provision of the protrusions 249 is the same as the above embodiment in that a decrease in fluid flow rate, fluid stagnation, coagulation, and the like can be prevented. In addition, in the example of the same figure, it is not necessary to provide a groove in the center of the disc part 243 by making the luer 190 contact the upper surface of the rib 2441.

  (4) The form of the septum 130 is not limited to the above embodiment, and for example, the following modifications can be considered. FIG. 7 is a cross-sectional view of the co-injection port according to this modification, and a septum 130 having a different shape is used.

  In the region 1141 in FIG. 4 described above, the retention of the medical fluid is particularly problematic in that the region is a very small gap surrounded by the back surface of the septum 130 deformed by the insertion of the luer 190 and the wall surface of the lumen 114. 1142. Although it is possible to suppress the retention in the region 1142 to some extent by providing the circulating portion 140, it is more preferable to integrally form the annular rib 133 on the inner cavity 114 side of the septum 130 as in the example shown in FIG. . Since the annular rib 133 acts to fill the region 1142 when a tube member such as the luer 190 is inserted, it is possible to prevent a very small gap that tends to stay like the region 1142 in the first place. is there.

  In the example shown in the figure, the shape of the septum 130 is simplified, and the shape of the lumen 114 portion of the flow path tube portion 110 is also different, and the tip of the annular rib 133 is in close contact with the inner wall portion of the lumen 114. A step portion 1145 is provided. In the mixed injection port of the figure, the shapes of the flow path pipe part 110 and the septum 130 are simplified, and a mixed injection port that is easier to manufacture can be provided as compared with the above embodiment.

  In the above mixed injection port, the thickness of the annular rib 133 is large, and when the surface on the lumen side of the slit is a flat surface, when the septum 130 is fixed to the channel tube 110 by the cap 120, There may be a situation in which the surface side of the slit 131 is slightly opened. For this reason, in the example of the figure, the occurrence of the problem is prevented by providing the protrusion 136 by integral molding on the back surface of the septum 130 (around the slit 131).

  Further, when the annular rib 133 is provided on the septum 130, the shape of the annular rib 133 is not limited to that shown in FIG. 7. For example, as shown in FIG. A form in contact with the inner wall surface is also possible.

  (5) In the above embodiment, the circulating portion 140 is configured as a separate member from the flow path tube portion 110. However, when the size of a medical connector such as a mixed injection port is sufficiently large, both are integrally formed. It is also possible to do.

  (6) In the above embodiment, the case where the slit 131 is configured to penetrate the septum 130 from the beginning has been described. However, the slit 131 does not necessarily have to penetrate the septum 130 from the beginning, and a lure or the like is inserted first. In this case, a configuration that completely penetrates the septum 130 is also conceivable.

  (7) In the above embodiment, the case where the septum 130 is substantially circular has been described. However, the entire body including the septum 130 may be formed in an elliptical shape (International Application No. PCT / JP2004 / 009732). reference). In this case, as shown in the bottom view of FIG. 9, it is preferable to provide the slit 131 in the direction along the minor axis of the elliptical septum 130. This is because when a tube member such as a lure is inserted into the slit 131, the pressing force from the major axis direction is stronger, so that the sealing ability of the lumen 114 can be improved. Such a problem may occur when the end face of one end of the channel tube closed by the septum 130 or the insertion hole 121 is elliptical, but the entire septum 130 may be circular. In this case, the slit 131 is preferably formed along the end face of one end of the channel tube or the elliptical minor axis of the insertion hole 121.

  (8) In the above embodiment, the leg 111 side is inserted into the tube and fixed. However, the fixing method is not particularly limited. For example, a known female luer is known for the structure of the portion. Even if the lock connector is fixed, the same effect as the present embodiment can be obtained.

  (9) In the above embodiment, the chemical solution is injected by the lure. However, the present invention is not limited to this. The present invention is also applicable to the case where the cleaning solution is injected or blood collected using a cannula. Is possible.

  The present invention can be applied to a medical connector such as a mixed injection port used for parenteral nutrition, blood transfusion, blood collection, and the like.

It is a disassembled perspective view for demonstrating the structure of the mixed injection port in embodiment of this invention. It is sectional drawing of the mixed injection port in embodiment of this invention. FIG. 6 is a perspective view illustrating an example of a configuration of a circulating portion 140. It is sectional drawing which shows the state by which the lure was inserted in the mixed injection port. It is sectional drawing which shows an example of a structure of the mixed injection port when not providing the attitude | position control part 142. FIG. It is a perspective view which shows an example of the other structure of a circulation part. It is sectional drawing of an example of the mixed injection port which provided the annular rib 133. FIG. It is sectional drawing of another example of the mixed injection port provided with the annular rib 133. FIG. 6 is a bottom view of the septum 130 in the case where the septum 130 has an elliptical shape and the slit 131 is provided in a direction along the minor axis of the septum 130. It is sectional drawing for demonstrating the structure of the conventional connector.

Explanation of symbols

DESCRIPTION OF SYMBOLS 110 Channel pipe part 111 Leg part 112 Body part 113 Engagement protrusion 114 Lumen 1141, 1142 Gap area | region 1145 Step part 115 Inner wall 116 Outer peripheral edge 117 Narrow pipe part 118 Annular protrusion 120 Cap part 121 Insertion hole 122 Engagement part 123 Engagement Hole 130 Septum 131 Slit 133 Annular rib 136 Protrusion 140, 240 Circulation part 141, 241 Circulation plate part 142, 242 Posture restricting part 143, 243 Disc part 144, 244 Edge part 149, 249 Protrusion 190 Luer

Claims (8)

A septum having a slit into which the tube member can be inserted and deformable by insertion of the tube member into the slit, a flow channel tube whose opening at one end thereof is blocked by the septum, and the lumen In the medical connector having a recirculation portion having a recirculation plate portion for recirculating the supplied fluid to the septum side, the flow path tube communicates to the other end side in the direction opposite to the lumen and the septum. A narrow tube having a smaller inner diameter than the lumen, and the recirculation portion can be inserted into the lumen of the narrow tube portion so as to secure a flow path for the fluid on the thin tube side of the recirculation plate portion, and on the downstream side A projection having a horizontal cross-sectional area that gradually decreases toward the surface and disposed on a step formed by the bottom surface of the lumen and the lumen surface of the capillary tube Connector. A septum having a slit into which the tube member can be inserted and deformable by insertion of the tube member into the slit, a flow channel tube whose opening at one end thereof is blocked by the septum, and the lumen In the medical connector having a reflux portion having a reflux plate portion for circulating the supplied fluid to the septum side, the reflux portion secures the fluid flow path on the narrow tube side of the reflux plate portion. A posture restricting portion that can be inserted into the lumen of the thin tube portion, and the reflux plate portion is disposed on a step formed by a bottom surface portion of the lumen and a lumen surface of the thin tube portion; A medical connector, characterized in that a projection having a horizontal cross-sectional area gradually decreasing toward a downstream side is provided at a lower end of the posture regulating portion . The medical connector according to claim 2, wherein the flow path pipe other end side of the posture restricting portion and the protrusion are connected so that the surface thereof is a smooth curved surface. The medical connector according to claim 1, wherein the protrusion is streamlined. The medical connector according to any one of claims 2 to 4, wherein the posture restricting portion has a cylindrical shape. 6. The reflux plate portion includes an edge portion projecting from an edge thereof toward the septum so that an inner surface of a rising portion thereof is a smooth curved surface. A medical connector according to any one of the above. The shape of the opening part of the insertion hole of the flow path pipe blocked by the septum is elliptical, and the slit of the septum is provided in the minor axis direction of the elliptical shape. Medical connector according to crab. The annular rib provided so that at least a part of the outer peripheral side and the tip of the septum may be in contact with the inner wall surface of the lumen over the entire periphery is integrally formed with the septum. The medical connector according to any one of 1 to 7.

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