Fitting / removal connector

Abstract

To provide a fitting / removal connector capable of reducing re-insertion into a patient and physical injury by removal in a connection point in an infusion line and a urine collection line, without removal from an insertion region, when a considerable degree of force is applied to the infusion line and the urine collection line.SOLUTION: A fitting / removal connector 3 is used when an insertion-side set 2 having an insertion part 25 for being inserted into a patient side and a bag-side set 1 having an infusion bag or a urine collection bag are connected together. The fitting / removal connector 3 comprises a male connector 7 and a female connector 6. The male connector 7 and the female connector 6 are disconnected from each other by applying a predetermined force in a disconnection direction opposite to an insertion direction.SELECTED DRAWING: Figure 4

Description

[Technical field]

[0001] The present invention relates to a removable connector and a liquid line. More specifically, the present invention relates to a removable connector used to connect an insertion side set having an insertion part to be inserted into a patient side to a bag side set having an infusion bag or a urine collection bag, the removable connector being made up of a male connector and a female connector, and a liquid line equipped with such a removable connector. [Background technology]

[0002] In an infusion line, a connector is used to connect tubes together. For example, as in Non-Patent Document 1, when an insertion part (such as a butterfly needle or an intravenous indwelling needle) is inserted directly into a vein, a connector is used between the infusion bag and the insertion part. Also, as in Non-Patent Document 2, in a CV port (see Non-Patent Document 2) used when infusing anticancer drugs or high-calorie infusions (nutritional liquids replacing meals), a catheter is placed in a blood vessel and a needle is inserted into a port at one end of the catheter, and in this case too, a connector is used between the infusion bag and the insertion part.

[0003] In addition to intravenous drips, in urethral catheters, a connector is used between the indwelling urethral catheter on the bladder side and the urinary drainage tube on the urine collection bag side (see Non-Patent Documents 3 and 4). Connectors are generally used in liquid lines through which liquid flows, such as infusion lines and urine collection lines.

[0004] Conventionally, the connectors used at the connection points are required to have a strong connection function, such as how to prevent loosening and how to prevent disconnection, based on the idea that safety during infusion cannot be ensured if loosening or disconnection occurs, in order to prevent disconnection midway through the line (to realize a so-called "closed system"). Such connectors have realized a strong connection function, such as a luer lock type, which is fixed by twisting a screw. For example, Patent Document 1 describes a connector that cannot be disconnected unless rotation occurs because it is connected by screwing. In addition, Non-Patent Document 5 describes Twin Shield (registered trademark), a connector that cannot be disconnected unless rotation occurs by releasing the claw lock caused by an external force. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] JP 2005-466 A [Non-patent literature]

[0006] [Non-Patent Document 1] Infusion Preparations Association, Terminology Explanation, Infusion Line (Drip Line), [Searched on July 10, 2023], Internet: https: / / www.yueki.com / faq / words37 / index.html [Non-Patent Document 2] Sanno Hospital PICC, [Searched July 10, 2023], Internet: https: / / www.sannoclc.or.jp / hospital / patient / department / shoukaki_c / pdf / picc2.pdf [Non-Patent Document 3] Japanese Society for Environmental Infection Prevention of Urinary Catheter-Associated Urinary Tract Infection, [Retrieved July 10, 2023], Internet: http: / / www.kankyokansen.org / other / edu_pdf / 3-3_06.pdf [Non-Patent Document 4] Nurse Plus Urethral Catheter Q&A, [Searched July 10, 2023], Internet〈https: / / kango.mynavi.jp / contents / nurseplus / workstyle / 20200522-16750 / 〉 [Non-Patent Document 5] JMS Needleless Access Port, JMS Co., Ltd., [Retrieved July 10, 2023], Internet: https: / / medical.jms.cc / pdf / B097_twinshield_catalog.pdf [Non-Patent Document 6] Japan Red Cross Medical Center, Collection of Common Cases of Removal, [Retrieved July 10, 2023], Internet: https: / / www.carecom.jp / smile / pdf / pamphlet_case-008.pdf [Non-Patent Document 7] Today's Clinical Support Urethral Injury (including self-removal), [Searched July 10, 2023], Internet: https: / / clinicalsup.jp / jpoc / contentpage.aspx?diseaseid=1340 [Non-Patent Document 8] 3M Japan Catheter Fixation Dressing, [Searched on July 10, 2023], Internet: https: / / www.3mcompany.jp / 3M / ja_JP / medical-jp / dressings / tegaderm / Summary of the Invention [Problem to be solved by the invention]

[0007] As shown in Non-Patent Document 6, many patients receiving intravenous drips in hospitals are delirious or elderly, and self-removal of infusion lines and urinary catheters is a problem. Even for patients who are not delirious or elderly, high-calorie infusions and FOLFIRI anticancer drug therapy are continued for several days, so removal of lines while asleep is also a problem. In addition, treatments called drainage, which are used to discharge accumulated fluids after surgery and monitor leakage from sutures, are also continued for several days. Furthermore, as shown in Non-Patent Document 7, elderly people and infants have been known to remove urethral catheters themselves.

[0008] If the catheter falls out due to self-removal, etc., it must be reinserted (inserted the needle again), but reinsertion causes great pain to the patient. Furthermore, bleeding caused by the catheter falling out can cause physical injury to the patient. In the case of a urethral catheter, there is also the risk of physical injury such as urethral damage. The risk of self-removal increases the longer the catheter is left in place.

[0009] In addition, catheters are usually fixed to the body at the insertion site with an adhesive covering protective material such as a dressing (for example, see Non-Patent Document 8). However, when the patient removes the catheter themselves, the catheter can come loose at the insertion site, causing the leakage of body fluids and medicinal solutions.

[0010] When such leakage of bodily fluids or medicinal fluids occurs, it is necessary to clean it up, but this poses a significant burden, especially when there are few people working in the hospital, such as at night, or when continuous infusions are performed at home over several days using a portable balloon infuser.

[0011] Therefore, the present invention aims to provide a detachable connector and liquid line that, when an extremely large force is applied to an infusion line or urine collection line, will come loose at the connection point in the infusion line or urine collection line rather than at the insertion point, thereby reducing the risk of re-insertion or physical injury to the patient. Another object of the present invention is to provide a safe removable connect and liquid line that prevents leakage of bodily fluids or medicinal fluids due to disconnection at the connection point. [Means for solving the problem]

[0012] In order to achieve the above-mentioned objective, the detachable connector of the present invention is a detachable connector used when connecting an insertion side set having an insertion portion to be inserted into the patient side to a bag side set having an infusion bag or a urine collection bag, and is characterized in that the detachable connector consists of a male connector and a female connector, and the male connector and the female connector can be detached when a predetermined force is applied in a removal direction opposite to the insertion direction.

[0013] Since the connection between the insertion side set and the bag side set is not a conventional lock with a claw or a strong screw-on / off engagement, for example, when a certain force is applied in the opposite direction to the insertion direction (insertion direction) due to a strong force such as self-removal in an infusion line, the male connector and female connector will come off. Therefore, since removal at the insertion part is suppressed, re-insertion and physical damage to the patient can be reduced.

[0014] Similarly, in the urine collection line, when a strong force is applied, the male connector and female connector will come apart, reducing the risk of reinsertion or physical injury to the patient.

[0015] In addition, because the connector is configured to be detached when a certain force is applied, it will not detach even if a small force less than that is applied to the liquid line. In other words, the present invention adjusts the detachment conditions for the male connector and the female connector.

[0016] In the removable connector of the present invention, the predetermined force (removal force) is preferably 3 to 45 N. If the male connector and female connector were to easily detach with a weak force, such as touching an infusion line or a urine collection line, rather than with a large force that would cause self-removal, the connector would detach frequently, requiring reinsertion of the male connector and female connector each time. However, by allowing the connector to detach with this level of removal force, frequent detachments with a weak force are prevented, and removal is possible before the protective covering used to secure the insertion part is peeled off.

[0017] A more preferable range is 7 to 10 N, which is sufficient for use with many of the many types of protective covering materials. In addition, a method for realizing such a separation force can be, for example, by having one of the male and female connectors have a hard connection part made of a hard material and the other have an elastic connection part made of an elastic material, and making the Shore A hardness of this elastic connection part 50.

[0018] In addition, in the plug-and-disconnect connector of the present invention, the male connector and the female connector are inserted and removed with one having a hard connection portion made of a hard material and the other having an elastic connection portion made of an elastic material, and it is preferable that the male connector and the female connector have abutment positioning portions.

[0019] The deformation of the elastic connection portion causes the male connector and the female connector to separate, and when a strong force is applied to the infusion line or the urine collection line, the male connector and the female connector will separate. In addition, the abutment positioning portion of the male connector and the female connector stops the insertion of the male connector into the female connector by abutting, so that the same insertion amount can always be achieved. And, because the insertion amount is stable, the separation between the male connector and the female connector can be made uniform.

[0020] In addition, the plug-and-disconnect connector of the present invention is characterized in that the male connector and the female connector are inserted and removed with one having a hard connection portion made of a hard material and the other having an elastic connection portion made of an elastic material, and that the hard connection portion and the elastic connection portion are formed with engaging convex and concave portions.

[0021] When the male and female connectors are separated, the disconnectable connector generates a moderate impact and sound. The impact and sound give a sense of relief to patients who may attempt to remove the connector themselves, which calms them down and inhibits them from attempting to remove the connector themselves for a while.

[0022] In addition, in the removable connector of the present invention, it is preferable that the male connector and the female connector each have a check valve for the flow path, which can prevent the outflow of bodily fluids or medicinal fluids in the event of separation from the removable connector, making the removable connector safer.

[0023] In addition, it is preferable that the removable connector of the present invention has an insertion side attachment part for attachment to an insertion side set on one of the male connector and the female connector, and a bag side attachment part for attachment to a bag side set on the other. The removable connector can be easily attached to the tube part of an existing insertion side set (for example, a SurePlug AD, or if this is not the case, to a three-way stopcock) or to the tube part of the bag side set.

[0024] In addition, the liquid line of the present invention is a liquid line consisting of a piercing side set having a piercing part to be pierced into the patient side, a bag side set having an infusion bag or a urine collection bag, and a pair of removable connectors connecting the piercing side set and the bag side set, the pair of removable connectors preferably consisting of a male connector and a female connector, and the male connector and the female connector are preferably detached by applying a predetermined force in a detachment direction opposite to the insertion direction. This prevents the piercing part from coming off in an actual infusion line or urine collection line, thereby reducing re-piercing and physical damage to the patient. [Brief description of the drawings]

[0025] [Figure 1] 1 is an image showing a liquid line according to the first embodiment. [Diagram 2] FIG. 2 is an exploded perspective view showing the coupling / uncoupling connector of the first embodiment. [Diagram 3] FIG. 2 is an exploded perspective view showing the plug-and-unplug connector of the first embodiment as seen from another direction. [Figure 4] FIG. 1A is a cross-sectional view showing the mating state of the mating connector of the first embodiment, and FIG. [Diagram 5] 11 is an image showing the liquid line of the second embodiment. [Figure 6] 11 is a cross-sectional view showing the mated state of the mating connector of the second embodiment. FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0026] The following describes the mode for carrying out the present invention with reference to the embodiments and drawings, but the embodiments shown below are not intended to limit the present invention to those described herein, and the present invention is equally applicable to those in which various modifications are made without departing from the technical ideas set forth in the claims. Note that in each drawing used for explanation in this specification, each component is shown at a different scale so that each component is large enough to be recognized on the drawing, and is not necessarily shown in proportion to the actual dimensions.

[0027] [Embodiment 1] First, the difference between a liquid line 200 consisting of a conventional infusion line and the liquid line 100 of this embodiment will be described with reference to Fig. 1. As shown in Fig. 1, both the conventional liquid line 200 and the liquid line 100 of this embodiment consist of a bag side set 1 and an insertion side set 2.

[0028] The bag-side set 1 is composed of an infusion bag (not shown) suspended from an infusion stand, a vial needle 11 inserted into the infusion bag, an infusion tube 13 connected to the vial needle 11 via a first extension tube 12, a clamp 15 connected to the infusion tube 13 via a second extension tube 14, a third extension tube 16 connected to the second extension tube 14 via the clamp 15 (in reality, the second extension tube 14 and the third extension tube 16 are a continuous, integrated tube), and an infusion outlet connector 17 connected to the third extension tube 16. In this embodiment, Terumo's "Terufusion (registered trademark) infusion set (TI-U751P)" is used for the set including the vial needle 11, the first extension tube 12, the infusion tube 13, the second extension tube 14, the clamp 15, the third extension tube 16, and the infusion outlet connector 17.

[0029] The insertion side set 2 is composed of an infusion inlet connector 21 (for example, Terumo's "SurePlug (registered trademark) AD SA-1W"), a three-way stopcock 22 to which the infusion inlet connector 21 is attached by screwing, a needle connector 24 connected to the three-way stopcock 22 via a fourth extension tube 23, and an indwelling needle for vein 25, which is an insertion part attached to the needle connector 24 by screwing. In this embodiment, Terumo's "Terufusion (registered trademark) three-way stopcock with extension tube (TS-WR0525L)" is used for the set including the three-way stopcock 22, the fourth extension tube 23, and the needle connector 23. In addition, Medikit's "Supercas 5" is used for the indwelling needle for vein 25.

[0030] In such a bag side set 1 and insertion side set 2, in the conventional liquid line 200, the infusion outlet connector 17 and the infusion inlet connector 21 were firmly fixed by screwing (a female screw provided on the inner circumference of the collar on the infusion outlet connector 17 side and a male screw provided on the outer circumference of the female part on the infusion inlet connector 21 side).

[0031] On the other hand, the liquid line 100 of this embodiment is a conventional liquid line 200 consisting of a bag side set 1 and an insertion side set 2, with the infusion outlet connector 17 and the infusion inlet connector 21 added to it, and the bag side set 1 and the insertion side set 2 are connected via this detachable connector 3.

[0032] Since the bag side set 1 and the insertion side set 2 are general commercially available products, detailed explanations will be omitted. Also, there are various bag side sets 1 and insertion side sets 2 other than those shown in FIG.

[0033] Next, the mating / disconnecting connector 3 of the first embodiment will be described with reference to Figures 2 to 4. Figure 2 is an exploded perspective view showing the main parts of the mating / disconnecting connector 3, and Figure 3 is an exploded perspective view seen from a different direction than Figure 2. Figure 4A is a cross-sectional view showing the mating / disconnecting connector in a detached state, and Figure 4B is a cross-sectional view showing the mating / disconnecting connector in a mated state. As shown in FIGS. 2 and 3, the removable connector 3 is composed of a female connector 6 and a male connector 7 from the bag side toward the insertion side.

[0034] In this female connector 6, a bag side mounting portion 61, a bag side check valve 62, a valve holder 63, and an elastic connecting portion 64 are joined in this order from the bag side to the insertion side. In addition, in the male connector 7, a hard connection portion 71, an insertion side check valve 72, and an insertion side mounting portion 73 are joined in this order from the bag side to the insertion side.

[0035] In such a female connector 6 and male connector 7, the bag side mounting portion 61, valve holder 63, elastic connecting portion 64, hard connecting portion 71 and insertion side mounting portion 73 are made of hard materials (e.g., resins such as polycarbonate and polypropylene, or metals), and the bag side check valve 62, elastic connecting portion 64 and insertion side check valve 72 are made of elastic materials (e.g., silicone rubber, isoprene rubber, elastomer, etc.).

[0036] 2 and 3, the bag-side mounting portion 61 of the female connector 6 is made up of two tubular portions of different thicknesses, the tubular portion with the smaller diameter on the inner bag side being the female portion 611, on the outer periphery of which is formed a male thread 61S conforming to the ISO80369 series, as shown in Fig. 4B. The female connector 6 and the infusion outlet connector 17 are screwed together by this male thread 61S and a female thread provided on the inner periphery of the collar of the existing infusion outlet connector 17 of the bag-side set 1.

[0037] 2, the insertion side mounting part 73 of the male connector 7 has a male part 731 facing the insertion side covered with a cylindrical collar 732, and as shown in FIG. 4B, a female screw 73S conforming to the ISO80369 series is formed on the inner circumference of the collar 732 of the insertion side mounting part 73. The male connector 7 and the infusion inlet connector 21 are screwed together by this female screw 73S and a male screw provided on the outer circumference of the female part of the existing infusion inlet connector 21 of the insertion side set 2.

[0038] [Opening / closing the flow path] As shown in Fig. 4A, the bag side mounting part 61, the bag side check valve 62, the valve holder 63, and the elastic connecting part 64 of the female connector 6 are respectively formed with a first flow path R1 to a fourth flow path R4. As shown in Figs. 2 and 3, the bag side check valve 62 is formed with three second flow paths R2. As shown in Fig. 4A, since the second flow path R2 of the bag side check valve 62 and the third flow path R3 of the valve holder 63 are misaligned, the infusion flow path from the bag side mounting part 61 to the elastic connecting part 64 of the female connector 6 is closed by the bag side check valve 62 when the female connector 6 is not engaged with the male connector 7.

[0039] As shown in Fig. 4A, the fifth flow path R5 to the seventh flow path R7 are formed in each of the rigid connection part 71, the insertion side check valve 72, and the insertion side mounting part 73 of the male connector 7. As shown in Fig. 2 and Fig. 3, an inlet path R5a formed by four semicircular notches is formed on the inlet side (female connector 6 side) of the fifth flow path R5 of the rigid connection part 71, and a separation path R5b of four circular holes formed by butting dies is formed near the outlet.

[0040] As shown in Figs. 2 to 4, the insertion side check valve 72 is shaped such that the inner ring 722 is supported by a thin membrane 723 that bulges out in a ring shape toward the insertion side between the inner ring 722 located at the center of the outer ring 721 and the outer ring 721. As shown in the enlarged view of Fig. 4A, the sixth flow path R6 of the insertion side check valve 72 is a hole provided in the inner ring 722. As shown in Fig. 4A, when the male connector 7 is not engaged with the female connector 6, the flow pressure of the infusion is not applied to the insertion side check valve 72, so that the inner ring 722 of the insertion side check valve 72 is in close contact with the hard connection part 71. In this configuration, even if blood pressure due to the backflow of blood from the insertion side is applied to the insertion side check valve 72 in this close contact state, the blood will not flow back and flow out of the male connector 7.

[0041] As shown in Figs. 2 to 4, the rigid connection portion 71 of the male connector 7 is provided with a fitting connection dowel 711 having a two-stage protrusion 712, and the elastic connection portion 64 of the female connector 6 is provided with a connection hole 641 having a two-stage recess 642 that engages with the protrusion 712. As shown in Fig. 4B, the rigid connection portion 71 of the male connector 7 is fitted into the elastic connection portion 64 of the female connector 6. At this time, since the material of the elastic connection portion 64 is an elastic material, the rigid connection portion 71 can be easily press-fitted. The shape of the protrusion 712 and the recess 642 that engages therewith may be not only a bamboo shoot shape that narrows toward the insertion direction as shown in the drawings, but also a round (donut) shape or other shape.

[0042] 4B, when the female connector 6 and the male connector 7 are mated, the insertion side mounting part 73 of the fifth flow path R5 that penetrates the fourth flow path R4 and the third flow path R3 presses the soft bag side check valve 62, deforming the bag side check valve 62. This opens the first gap T1 that serves as a passage between the second flow path R2 of the bag side check valve 62 and the inlet path R5a of the hard connection part 71.

[0043] Then, the infusion liquid that has flowed through the first flow path R1 and the second flow path R2 flows into the first gap T1 and the fifth flow path, and presses the insertion side check valve 72. As a result, the soft, thin, ring-shaped membrane 723 that swells toward the insertion side receives the infusion liquid and deforms, opening the second gap T2 that serves as a passage for the fifth flow path R5 of the rigid connection part 71 and the sixth flow path R6 of the insertion side check valve 72. Then, the infusion liquid that has flowed up to the fifth flow path R5 flows through the second gap T2 and the sixth flow path R6, and flows through the infusion inlet connector 21 to the venous indwelling needle 25 at the insertion part, which is the end of the liquid line 100.

[0044] The connector of the conventional liquid line 200 is firmly engaged by locking with a claw or screwing with a screw. On the other hand, in the liquid line 100 of the present embodiment, the bag side set 1 and the insertion side set 2 are connected using a removable connector 3 consisting of a female connector 6 and a male connector 7. This removable connector 3 will come off when a force is applied in the removal direction opposite to the insertion direction. Therefore, as described in the case collection of Non-Patent Document 6, in cases where delirium patients, elderly people, or infants remove the venous indwelling needle 25 themselves, or, for example, when the extension tube gets caught on the caster part of the IV stand and the venous indwelling needle 25 is removed by turning over in sleep, the venous indwelling needle will come off first between the female connector 6 and the male connector 7. Therefore, since the removal at the insertion part is suppressed, reinsertion and physical damage to the patient can be reduced.

[0045] In addition, a convex portion 712 is provided on the outer periphery of the hard connection portion 71 of the male connector 7, and a concave portion 642 that engages with the convex portion 712 is provided on the inner periphery of the elastic connection portion 64 of the female connector 6. Such convex portion 712 and concave portion 642 generate a moderate impact and sound when the male connector 7 and the female connector 6 of the removable connector 3 are separated by the application of a force in the removal direction opposite to the insertion direction. Unlike accidental removal, patients who perform self-removal are often satisfied once they feel a sense of relief from removal, even though the cause is not clear. Therefore, by deliberately making the patient feel the separation of the male connector 7 and the female connector 6 through impact and sound, the patient can calm down and suppress behavior such as self-removal for a while.

[0046] In addition, the separation force at which the female connector 6 and the male connector 7 in the removable connector 3 are separated when a predetermined force is applied in the removal direction opposite to the insertion direction is preferably a force weaker than the retention force of the protective covering material on the venous indwelling needle 25. If a force stronger than the retention force of the protective covering material is instantaneously applied, the female connector 6 and the male connector 7 will separate before the protective covering material is peeled off, thereby preventing the removal of the venous indwelling needle 25.

[0047] Therefore, the inventors carried out a tensile test using commercially available protective covering materials that were actually attached to the arm for verification. The adhesive strength was approximately 45N for GRIP-LOK (registered trademark), approximately 10N for CathelyPlus (registered trademark) IV, and approximately 4N for SORBAVIEW (registered trademark) SHIELD, which have very strong adhesive strengths. In addition, it is not practical if the connectors come apart too easily. Therefore, the force required for the female connector 6 and the male connector 7 to separate is preferably in the range of 3 to 45N, and more preferably in the range of 7 to 10N.

[0048] As a specific method for realizing such a separation force, for example, in the removable connector 3 of this embodiment, according to verification by the inventor, a separation force of about 10 N can be realized by setting the Shore A hardness of the elastic connection part 64 of the female connector 6 to 50 for the hard connection part 71 of the male connector 7 made of a hard material, about 20 N can be realized by setting the Shore A hardness to 70, and about 40 N can be realized by setting the Shore A hardness to 90. Also, the size of the convex part 712 and the concave part 642 can be adjusted.

[0049] As described above, since the adhesive strength differs depending on the covering protective material, it is possible to prepare a removable connector with a different detachment force depending on the adhesive strength of the covering protective material. For example, the covering protective material, the dressing material, can be broadly divided into those used when performing from a peripheral vein and those used when performing from a central vein. Since peripheral vein dressings are expected to be used for a short period of time and are used frequently, covering protective materials generally have low adhesive strength and a small area from the viewpoint of cost. On the other hand, central vein dressings are expected to be used for a long period of time and use a catheter with a large diameter, so covering protective materials generally have high adhesive strength and a large area. Therefore, it is possible to use removable connectors with different detachment forces depending on the purpose of use, such as peripheral vein dressings and central vein dressings.

[0050] In this embodiment, an abutment positioning portion 8 is provided so that the positions of the convex portion 712 and the concave portion 642 stop at a desired position when the male connector 7 is inserted into the female connector 6. Specifically, this abutment positioning portion 8 is composed of a first abutment surface 81 exposed from the fourth flow path R4 of the valve holder 63 made of a hard material in the female connector 6 shown in Fig. 4A, and a second abutment surface 82 in the convex portion 712 on the tip side (female connector 6 side) of the hard connecting portion 71 made of a hard material in the male connector 7 shown in Fig. 4A.

[0051] 4B, the first abutment surface 81 of the female connector 6 and the second abutment surface 81 of the male connector 7 come into contact with each other when the male connector 7 is inserted into the female connector 6. The abutment between the first abutment surface 81 and the second abutment surface 82 made of a hard material ensures that the insertion of the male connector 7 stops at this position, so that the same insertion amount can always be achieved. Therefore, the abutment positioning portion 8 of this embodiment stabilizes the insertion amount, so that uniform separation between the female connector 6 and the male connector 7 can be achieved.

[0052] In addition, when the female connector 6 and the male connector 7 are separated, the bag-side check valve 62 of the female connector 6 of this embodiment prevents leakage of infusion fluid. In addition, the insertion-side check valve 72 of the male connector 7 prevents leakage of blood.

[0053] In addition, the insertion side check valve 72 of the male connector 7 of this embodiment is configured to prevent backflow even when the female connector 6 and the male connector 7 are engaged. Therefore, for example, when directly inserting a vein for drip infusion, backflow of blood is checked, but in this state, it is not possible to check whether the venous indwelling needle is inserted correctly by checking the backflow. However, in this case, this backflow check can be performed using a three-way stopcock. Also, backflow check may be performed before connecting the removable connector 3. Also, a configuration can be adopted in which a pressing part is separately provided to press the insertion side check valve 72 to allow backflow when the female connector 6 and the male connector 7 are engaged.

[0054] [Embodiment 2] Next, a liquid line 100A of embodiment 2 will be described with reference to Figures 5 and 6. In the liquid line 100A of the second embodiment, parts having the same configuration as the liquid line 100 of the first embodiment will be given the same reference numerals and detailed descriptions thereof will be omitted, and parts having the same names but different configurations will be given the suffix "A" after the reference numerals.

[0055] The liquid line 100 of the first embodiment is configured by adding the detachable connector 3 of the first embodiment between the infusion outlet connector 17 and the infusion inlet connector 21 of the conventional liquid line 200 .

[0056] In contrast, as shown in FIG. 5, a liquid line 100A of the second embodiment has the infusion inlet connector 21 of the conventional liquid line 200 replaced with the detachable connector 3 of the first embodiment (the male connector 7 thereof).

[0057] The insertion side mounting part 73 of the removable connector 3 has a female thread 73S conforming to the ISO80369 series formed on the inner circumference of a cylindrical collar 732. Therefore, the insertion side mounting part 73 of the removable connector 3 can be screwed to the male thread on the outer circumference of the female part of the three-way stopcock 22. In addition, since the insertion side check valve 72 is attached to the male connector 7 of the removable connector 3, blood will not leak from the male connector 7 even if the female connector 6 and the male connector 7 are separated. Therefore, the infusion inlet connector 21 equipped with a blood return valve used in the conventional liquid line 200 can be omitted.

[0058] In the liquid line 100A having such a configuration, as shown in FIG. 6, a flow path for infusion can be formed similar to that of the liquid line 100 of the first embodiment (FIG. 4B).

[0059] The existing bag side set and the existing insertion side set of the present invention are not limited to the above-mentioned configurations. The present invention can be applied to various bag side sets and various insertion side sets.

[0060] In addition, the liquid line of the present invention is not limited to those using infusion bags. As described in the collection of removal cases in Non-Patent Document 6, infusion tubes and catheters include not only peripheral venous lines but also CV ports. In addition to infusions, there are also urine collection lines in the opposite direction to infusions and various drains for draining bodily fluids, and the present invention can be applied to these as well.

[0061] In addition, in the removable connector 3 of this embodiment, when the female connector 6 and the male connector 7 are inserted, an elastic connection portion is formed on the female connector 6 side and a hard connection portion is formed on the male connector 7 side, but it is also acceptable for the female connector 6 side to be a hard connection portion made of a hard material and the male connector 7 side to be an elastic connection portion made of an elastic material.

[0062] Also, unlike this embodiment, in the plug-and-unplug connector of the present invention, when the female connector 6 and the male connector 7 are inserted into each other, both the connection parts of the female connector 6 and the male connector 7 can be formed of elastic connection parts. In this case, the elastic connection parts may have different hardnesses.

[0063] In addition, in the present embodiment, in the liquid line 100, the detachable connector 3 is treated as an independent part consisting of the female connector 6 and the male connector 7. However, in the liquid line of the present invention, various configurations can be adopted depending on the application, such as treating the female connector 6 of the detachable connector 3 as a part integrated and connected to the third extension tube 16 in place of the infusion outlet connector 17 of the bag-side set, and treating the male connector 7 as an independent part that is screwed onto the three-way stopcock 22 in place of the infusion inlet connector 21 as in the second embodiment. [Explanation of symbols]

[0064] 100, 100A, 200: Liquid line 1: Bag side set 17: Infusion outlet connector 2: Insertion side set 21: Infusion inlet connector 3: Detachable connector 6: Female connector 61: Bag side mounting part 62: Bag side check valve 63: Valve holder 64: Elastic joint 7: Male connector 71: Hard joint 72: Insertion side check valve 73: Insertion side attachment part R1 to R7: 1st flow path to 7th flow path

Claims

1. A removable connector used to connect an insertion side set having an insertion part to be inserted into a patient side and a bag side set having an infusion bag or a urine collection bag, The removable connector comprises a male connector and a female connector, The male connector and the female connector are separated from each other by application of a predetermined force in a removal direction opposite to the insertion direction.

2. 2. The connector according to claim 1, wherein the predetermined force is in the range of 3 to 45 N.

3. The male connector and the female connector are One has a hard connection portion made of a hard material, and the other has an elastic connection portion made of an elastic material, and is inserted and removed, 2. The connector according to claim 1, wherein the male connector and the female connector have abutment positioning portions.

4. The male connector and the female connector are One has a hard connection portion made of a hard material, and the other has an elastic connection portion made of an elastic material, and is inserted and removed, 2. The connector according to claim 1, wherein said hard connection portion and said elastic connection portion are formed with a projection and a recess that engage with each other.

5. 2. The connector according to claim 1, wherein the male connector and the female connector each have a check valve for a flow path.

6. 2. The connector as described in claim 1, wherein one of the male connector and the female connector is provided with an insertion side mounting portion for mounting to an insertion side set, and the other is provided with a bag side mounting portion for mounting to a bag side set.

7. An insertion side set having an insertion part to be inserted into a patient side; A bag side set having an infusion bag or a urine collection bag; A liquid line comprising a pair of removable connectors connecting the insertion side set and the bag side set, The pair of mating connectors includes a male connector and a female connector, A liquid line characterized in that the male connector and the female connector are separated by the application of a predetermined force in a removal direction opposite to the insertion direction.

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