Drainage bag connector and disposable drainage bag thereof

Abstract

According to the drainage bag connector and the disposable drainage bag thereof, the drainage bag connector is of an injection molding integrated structure, and the drainage bag connector is provided with a first connecting end and a second connecting end in the length direction of the drainage bag connector; the first connecting end is used for being fixedly connected with a liquid storage bag; the second connecting end is used for being fixedly connected with a transmission catheter; wherein the second connecting end is provided with a reducing part and an expanding part; the diameter reducing part is located on the side, close to the first connecting end, of the expansion part, and a vertical face step is formed on the annular interface of the diameter reducing part and the expansion part; the vertical surface step is fixedly arranged in the transmission guide pipe in a sleeving manner; a connecting ring is fixedly arranged outside the reducing part in a sleeving manner; the connecting ring and the outer wall of the reducing part are sealed; the elastic modulus of the connecting ring is larger than that of the connector body.

Description

Technical Field

[0001] The present application relates to the field of medical supplies, and in particular to a drainage bag connector and a disposable drainage bag thereof. Background Art

[0002] Peritoneal dialysis utilizes the semi-permeable nature of the peritoneum. Prepared dialysate is regularly and regularly infused into the patient's peritoneal cavity via a catheter, driven by gravity. Due to the concentration gradient across the peritoneum, solutes from the high-concentration side migrate to the low-concentration side (diffusion), while water migrates from the hypotonic side to the hypertonic side (osmosis). Continuous replacement of the peritoneal dialysate eliminates metabolic waste and toxic substances from the body and corrects water and electrolyte imbalances.

[0003] In existing technologies, patients undergoing continuous ambulatory peritoneal dialysis (CAPD) can manually change their dialysate, for example, two to five times daily. However, the Luer connector used in existing peritoneal dialysis drainage bags, which mate with the PD external tube, is a split-piece structure. This not only requires separate manufacturing, but also results in a complex overall manufacturing and assembly process, often involving manual docking and assembly. This results in low manufacturing efficiency and, as a disposable medical consumable, increases costs.

[0004] Furthermore, when the connector used in existing peritoneal dialysis waste fluid bags is inserted into the bag end for welding, the upper and lower film layers of the connector tube need to face each other and wrap around the connector tube during the docking process. Insufficient positioning accuracy of the connector tube or the accuracy of the weld itself can easily lead to a gap between the two film layers near the connector tube during docking, preventing an effective seal and resulting in defective products. Furthermore, the existing waste fluid bag connector tube is glued together with glue when connected to the PVC catheter. This assembly process is also relatively complex and requires manual operation, which not only affects manufacturing efficiency but also restricts manufacturing costs. Utility Model Content

[0005] In view of the shortcomings of current peritoneal dialysis drainage bags, one object of the present application is to provide a new type of drainage bag connector and a disposable drainage bag thereof, so as to simplify the assembly process and save manufacturing costs.

[0006] Another object of the present application is to provide a new type of drainage bag connector and a disposable drainage bag thereof, so that after high-temperature sterilization, the protruding connecting ring can maintain a sealed fit with the transmission catheter and the stability of the hook connection structure to avoid disengagement.

[0007] To achieve at least one of the above objectives, this application adopts the following technical solutions:

[0008] A drainage bag connector, the drainage bag connector is an injection-molded integral structure, and has a first connecting end and a second connecting end along its length direction;

[0009] The first connection end is used for fixedly connecting to the liquid storage bag; the second connection end is used for fixedly connecting to the transmission catheter; wherein, the second connection end is provided with a reduced diameter portion and an expanded portion; the reduced diameter portion is located on the side of the expanded portion close to the first connection end, and the annular interface between the reduced diameter portion and the expanded portion forms a vertical step; the vertical step is fixedly sleeved inside the transmission catheter; a connecting ring is fixedly sleeved outside the reduced diameter portion; the connecting ring is sealed with the outer wall of the reduced diameter portion; the elastic modulus of the connecting ring is greater than the elastic modulus of the connector body.

[0010] Preferably, a stop structure is fixedly provided on the outside of the reduced diameter portion; and the connecting ring is elastically sleeved on the outside of the reduced diameter portion between the stop structure and the vertical step.

[0011] Preferably, the stop structure comprises a stop ring that is integrally injection-molded with the joint body; the outer diameter of the stop ring is smaller than or equal to the outer diameter of the connecting ring.

[0012] Preferably, the material of the connecting ring is different from the material of the drainage bag connector, and both are non-PVC materials.

[0013] Preferably, the material of the connecting ring is the same as that of the transmission conduit.

[0014] Preferably, the weight percentage of the elastic material of the connecting ring is greater than the weight percentage of the elastic material of the drainage bag connector.

[0015] Preferably, the outer diameter of the connecting ring is greater than or equal to the outer diameter of the vertical step.

[0016] Preferably, the outer diameter of the connecting ring is greater than the outer diameter of the vertical step by more than 0.1 mm.

[0017] Preferably, the first connecting end includes a longitudinally extending main body tube and a wing portion integrally provided on the outer side wall of the main body tube; the wing portion includes connecting sheets symmetrically provided on both sides of the main body tube, and the connecting sheets have two opposite welding planes.

[0018] A disposable drainage bag, comprising:

[0019] a fluid storage bag for collecting the discharged drainage fluid;

[0020] The drainage bag connector as described above, wherein the first connecting end of the drainage bag connector is fixedly connected to the liquid storage bag;

[0021] The transmission catheter has one end connected to a connecting joint, and the other end is fixedly sleeved outside the second connecting end of the drainage bag joint. Beneficial effects

[0022] In the utility model, the disposable drainage bag with the drainage bag connector can maintain a sealed fit with the transmission catheter and the stability of the hook connection structure through the protruding connection ring after high-temperature sterilization, thereby avoiding disengagement.

[0023] In the present invention, the presence of the wing structure fills the gap between the two bag opening film layers when they are joined. Furthermore, because of the wing structure, the two bag opening film layers do not need to be tightly joined on one side of the main tube; welding can be performed by simply keeping them in close contact with the surface of the wing structure. This reduces the requirements for the joint position of the entire drainage bag connector, achieves a higher yield, and correspondingly, improves the quality of the weld seal.

[0024] In the present invention, the peritoneal dialysis three-way connector is an integrated structure, not a split structure. Thus, the peritoneal dialysis three-way connector having the dialysis Luer connector, the liquid inlet connector, and the liquid outlet connector is an integral injection-molded structure, which eliminates the need for separate manufacturing and subsequent assembly, thereby improving manufacturing efficiency. In addition, the peritoneal dialysis three-way connector has no split connection parts, and its own structural strength is higher.

[0025] The injection molding time of the peritoneal dialysis three-way connector using the structure of this embodiment is 4 pieces / 15 seconds, while the original manufacturing process using a PVC three-way structure inserted into a dialysis Luer connector and then high-frequency welding takes about 1 piece / 7 seconds to assemble a peritoneal dialysis three-way connector. It can be seen that the peritoneal dialysis drainage bag of the present invention greatly improves manufacturing efficiency, thereby saving manufacturing costs, and can reduce the manual assembly process, thereby improving the manufacturing process level. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 This is a schematic structural diagram of a disposable peritoneal dialysis kit provided by one embodiment of the present invention;

[0027] Figure 2 yes Figure 1 A schematic diagram of the first bag structure;

[0028] Figure 3 yes Figure 2 Schematic diagram of the drainage bag connector structure;

[0029] Figure 4 yes Figure 3 AA section view and partial enlarged view;

[0030] Figure 5 Yes Figure 4 Schematic diagram of six different cross-sectional shapes of the connecting sheet;

[0031] Figure 6 Available in 4 different shapes Figure 2 Schematic diagram of the structure of the middle drainage bag connector;

[0032] Figure 7 yes Figure 3 Schematic diagram of the cross section of the connection between the middle connecting sheet and the bag opening film layer;

[0033] Figure 8 This is a schematic diagram comparing the cross-sections of the connecting sheet before and after welding to the bag opening film layer;

[0034] Figure 9 yes Figure 1 A schematic cross-sectional structural diagram of the connection between the drainage bag connector and the second transmission tube;

[0035] Figure 10 This is a schematic cross-sectional view of the connection between the drainage bag connector and the second transmission tube provided by another embodiment of the present invention;

[0036] Figure 11 yes Figure 1 A three-dimensional diagram of the peritoneal dialysis three-way connector structure;

[0037] Figure 12 yes Figure 11 Another view of;

[0038] Figure 13 yes Figure 12 Front view of

[0039] Figure 14 This is a front view of a peritoneal dialysis three-way connector structure provided by another embodiment of the present invention;

[0040] Figure 15 This is a schematic diagram of the connection between a transmission pipe and a joint provided by another embodiment of the present invention;

[0041] Figure 16 This is a front view of a peritoneal dialysis three-way connector structure provided by another embodiment of the present invention;

[0042] Figure 17 This is a front view of a peritoneal dialysis three-way connector structure provided by another embodiment of the present invention;

[0043] Figure 18 This is a schematic structural diagram of a disposable drainage bag provided by another embodiment of the present application;

[0044] Figure 19 This is a schematic structural diagram of a disposable drainage bag provided by another embodiment of the present application;

[0045] Figure 20 yes Figure 19 The three-dimensional structure diagram of the drainage bag connector;

[0046] Figure 21 This is a schematic structural diagram of a disposable drainage bag provided by another embodiment of the present application;

[0047] Figure 22 yes Figure 21 Schematic diagram of the drainage bag connector structure;

[0048] Figure 23 yes Figure 21 3D structural diagram of the connection joint;

[0049] Figure 24 This is a structural front view of a connecting joint according to another embodiment;

[0050] Figure 25 yes Figure 23 Schematic diagram of the connection between the connecting joint and the transmission pipe;

[0051] Figure 26 is a schematic structural diagram of a connecting joint in another embodiment;

[0052] Figure 27 This is a structural front view of a connecting joint in another embodiment;

[0053] Figure 28 This is a structural front view of a connecting joint in another embodiment;

[0054] Figure 29 This is a structural front view of a connecting joint in another embodiment;

[0055] Figure 30 This is a schematic diagram of the connection between the drainage bag connector and the transfer tube catheter provided in another embodiment;

[0056] Figure 31 This is a structural front view of a connecting joint provided in another embodiment;

[0057] Figure 32 This is a structural front view of a connecting joint provided in another embodiment;

[0058] Figure 33 This is a structural front view of a connecting joint provided in another embodiment;

[0059] Figure 34 yes Figure 31 Schematic diagram of the connection between the connecting connector and the transmission tube catheter. DETAILED DESCRIPTION

[0060] like Figures 1 to 17 、 Figure 20As shown, one embodiment of the present application provides a disposable drainage bag, specifically a disposable peritoneal dialysis drainage bag, comprising: a first bag body 6 and a transfer tube assembly 50. The first bag body 6 is used to collect fluid discharged during peritoneal dialysis. Specifically, the first bag body 6 can serve as a waste fluid bag, collecting waste fluid or body fluid discharged from the human peritoneal cavity to the outside of the body during peritoneal dialysis.

[0061] Of course, in other embodiments, the following may be provided: Figure 18 、 Figure 19 The disposable drainage bag shown is used to discharge urine, wound drainage, bleeding or accumulated fluid. Its liquid storage bag 6 can also be called a waste liquid bag. It is in an empty and flat state before use. When in use, the drainage fluid is drained into the liquid storage bag 6 for storage.

[0062] like Figure 1 As shown, the transmission tube assembly 50 includes a first transmission tube 3, a second transmission tube 4, a protective cap 8 and a peritoneal dialysis three-way connector 10. Figures 2 to 8 As shown, the peritoneal dialysis three-way connector 10 includes a dialysis Luer connector 15, a liquid inlet connector 12, and a liquid outlet connector 11. The protective cap 8 is removably attached to the dialysis Luer connector 15. The protective cap 8 is a flexible, non-PVC material that covers the dialysis Luer connector 15 to prevent contamination. The protective cap 8 has a pull ring that allows the user to remove the protective cap 8 from the membrane-covered dialysis three-way connector 10. The dialysis Luer connector 15 is used to connect to a peritoneal dialysis external tube (peritoneal dialysis external tube). The peritoneal dialysis external tube is used to connect to the transfer tube assembly 50 and the peritoneal catheter outside the body, preventing or allowing the flow of membrane-covered dialysate or waste fluid. The peritoneal dialysis external tube is connected to the dialysis Luer connector 15 using a male-female Luer connector.

[0063] This disposable peritoneal dialysis drainage bag can be combined with a second bag body 20 to form a peritoneal dialysis set. The second bag body 20 is a solution bag, also known as a drug solution bag, containing peritoneal dialysis solution. The second bag body 20 has a second bag connection end 25; the first transfer tube 3 of the disposable peritoneal dialysis drainage bag in this embodiment is connected to the second bag connection end 25.

[0064] In this embodiment, the transfer tubes (first transfer tube 3 and second transfer tube 4) of the disposable peritoneal dialysis drainage bag are made of non-PVC material. Specifically, the first transfer tube 3 and the second transfer tube 4 are transfer conduits, also known as transfer hoses. One end of the first transfer tube 3 is fixedly connected to the liquid inlet connector 12, and the other end is used to connect to the second bag body 20 containing the dialysis solution. The second transfer tube 4 is fixedly connected to the liquid outlet connector 11 and the first bag body 6. The transfer tubes are made of a base material and an elastic material; the weight percentage of the base material and the elastic material is greater than 50%; the base material is PP or PE.

[0065] like Figure 1 、 Figure 2 As shown, the first bag body 6 includes a liquid storage bag and a drainage bag connector 5 fixedly connected to one end of the liquid storage bag. One end of the liquid storage bag connected to the drainage bag connector 5 is a bag connection end 61. The drainage bag connector 5 is an injection-molded integral structure. The drainage bag connector 5 is made of non-PVC material. The material of the drainage bag connector 5 can be similar to or the same as the material of the membrane-coated dialysis tee connector 10. Preferably, the material of the drainage bag connector 5 is the same as the material of the membrane-coated dialysis tee connector 10. Specifically, the material of the drainage bag connector 5 includes a base material and an elastic material. Among them, the base material and the elastic material are the main component materials of the drainage bag connector 5, and the weight percentage of the base material and the elastic material is more than 50%; the base material is PP or PE. The elastic material is one or more of SEBS, EVA, POE, SBS, EPR, TPEE, EPDM and SIS.

[0066] In this embodiment, the drainage bag connector 5 is connected to the center of the bag connection end 61. The first bag body 6 has a bag connection end 61 welded to the first connection end 501. The drainage bag connector 5 is fixedly connected to the second transfer tube 4. The tube end of the second transfer tube 4 is non-adhesively fitted over the drainage bag connector 5. The non-adhesive fixed connection method allows the tube end to be mechanically cold-pushed into the connector, eliminating the need for manual squeezing and applying glue, thereby improving manufacturing efficiency.

[0067] It has been verified that the existing manual glue-coating and squeezing manufacturing method has an approximate efficiency of about 2,500 pieces per worker every 8 hours. However, with the mechanical automatic cold-insertion manufacturing method of this embodiment, more than 9,000 pieces can be manufactured per worker every 8 hours. The connection efficiency between the connector and the transmission conduit is increased by more than 3 times, which can significantly improve manufacturing efficiency.

[0068] like Figures 3 to 6 As shown, the drainage bag connector 5 extends along its length direction H; the drainage bag connector 5 has a second connection end 502 connected to the second transmission tube 4 and a first connection end 501 connected to the first bag body 6. The main material of the drainage bag connector 5 and the second transmission tube 4 in this embodiment is the same, so that when the two are connected, they can form a fitting sealing structure due to the similar material, thereby avoiding connection leakage. The second connection end 502 is provided with at least one vertical step 54 facing the first connection end 501. The vertical step 54 is fixedly mounted inside the second transmission tube 4.

[0069] like Figure 3As shown, the second connection end 502 is provided with a reduced diameter portion 56 and an expanded portion 55. The reduced diameter portion 56 is located on the side of the expanded portion 55 close to the first connection end 501, and the annular interface between the reduced diameter portion 56 and the expanded portion 55 forms a vertical step 54. Figure 9 、 Figure 10 As shown, thanks to the structure of the vertical step 54, the reduced diameter portion 56, and the expanded portion 55, the tube end 41 of the second transfer tube 4 is non-adhesively attached to the exterior of the second connection end 502 of the drainage bag connector 5. The outer diameter of the reduced diameter portion 56 is larger than the inner diameter of the second transfer tube 4. Furthermore, when the first sleeve portion 412 of the reduced diameter portion 56 is retracted, the tube end 41 of the second transfer tube 4 remains expanded by the reduced diameter portion 56, closely adhering to the outer wall of the reduced diameter portion 56 (non-adhesive adhesion), enhancing the connection strength and ensuring sealing performance.

[0070] Specifically, the width of the vertical step 54 is between 1 and 20 mm. The vertical step 54 can form a hook structure for the tube end 41 of the second transmission tube 4. The second transmission tube 4 shrinks and changes diameter when it passes through the vertical step 54 under the condition of its own elastic recovery, and then the vertical step 54 hooks the second transmission tube 4, forming a stop for the second transmission tube 4. Figure 9 、 Figure 10 As shown, the stability of the connection is ensured by forming a physical hooking structure based on the close connection between the two.

[0071] The outer edge of the end of the drainage bag connector 5 has an end chamfer 551 to reduce the outer diameter of the end to be smaller than the inner diameter of the second transfer tube 4. The diameter of the end of the end chamfer 551 is smaller than the inner diameter of the second transfer tube 4. In this way, when squeezing and pushing, the end of the drainage bag connector 5 is conveniently inserted into the tube end 41 of the second transfer tube 4 by relying on the end chamfer 551, and the tube end 41 of the second transfer tube 4 is gradually pushed in to expand. Of course, the outermost (facing Figure 3 The expansion portion 55 (which is the lowest when the second transmission pipe 4 is in the middle) is preferably a conical structure to facilitate squeezing in and expanding the pipe end 41 of the second transmission pipe 4.

[0072] The connection length between the tube end 41 of the second transfer tube 4 and the second connecting end 502 is greater than the length of the expansion portion 55. Specifically, the connection length between the tube end 41 of the second transfer tube 4 and the second connecting end 502 is between 5 mm and 30 mm. When the second transfer tube 4 is connected to the drainage bag connector 5, the expansion portion 55 is sleeved within the tube end 41 of the second transfer tube 4. The tube end 41 of the second transfer tube 4 and the first connecting end 501 are connected by cold plugging.

[0073] like Figure 9As shown, the end 41 of the second transmission tube 4 primarily comprises a first sleeve portion 412 that sleeves over the reduced diameter portion 56 and a second sleeve portion 411 that sleeves over the expanded portion 55. The inner diameter of the first sleeve portion 412 is larger than the inner diameter of the second transmission tube 4 (not the end portion). That is, the first sleeve portion 412 remains enlarged by the reduced diameter portion 56, ensuring a tight seal between the two. The second sleeve portion 411 sleeves over the expanded portion 55 and is in close contact with its outer wall.

[0074] To form an effective physical hooking structure, the length of the reduced diameter portion 56 must be at least one-third of the inner diameter of the second transfer tube 4. In other words, L ≥ D / 3, where L is the length of the reduced diameter portion 56 and D is the inner diameter of the second transfer tube 4 (in its unsheathed state). For example, if the inner diameter of the second transfer tube 4 is 6 mm, the length of the reduced diameter portion 56 must be at least 2 mm.

[0075] The expansion portion 55 is a cylindrical or conical structure. Figure 10 As shown, the drainage bag connector 5 may have multiple vertical steps 54 to form a multi-level hooking structure to ensure the connection strength between the second transfer tube 4 and the corresponding drainage bag connector 5. Furthermore, the expansion part 55 is provided with 1, 2, or 3, and the reduction part 56 is provided with 1, 2, or 3. Figure 10 In the embodiment shown, there are two vertical steps 54 (54a, 54b), two expansion parts 55 (55a, 55b), and two reduced diameter parts 56 (56a, 56b), and the second transmission tube 4 is sleeved on the vertical steps 54 (54a, 54b), the expansion parts 55 (55a, 55b), and the reduced diameter parts 56 (56a, 56b) to form a two-level hooking structure.

[0076] In the existing connection process that lacks the wing structure 52, it is easy to produce seam gaps when the two bag film layers 611 are docked on both sides of the joint of the single tube body, especially at the docking position of the bag film layers 611, which leads to a higher defective rate. This requires that the welding position of the joint of the single tube structure is very precise to avoid the generation of seam gaps and ensure that the two bag film layers 611 and the single tube body form a complete circular sealing structure.

[0077] like Figure 1 、 Figure 3 、 Figure 7 、 Figure 8As shown, the drainage bag connector 5 includes a main body tube 51 and a wing structure 52 provided on the side wall of the main body tube 51. The wing structure 52 is integrally provided on the main body tube 51, and is integrally formed with the main body tube 51 by injection molding. The bag connection end 61 has a relatively connected bag opening film layer 611. The main body tube 51 and the wing structure 52 are fixedly clamped between the two bag opening film layers 611a and 611b. The wing structure 52 is laid flat between the two bag opening film layers 611a and 611b. The wing structure 52 extends in a radial direction. The wing structure is laid flat between the two bag opening film layers 611 so that the two bag opening film layers 611 are distributed on both sides of the wing structure 52 in a mirror-symmetrical manner, thereby ensuring the quality of the welding seal.

[0078] In order to form a better connection quality, the connecting sheet 521 has two opposite welding planes 527. When the wing structure 52 is laid flat between the two bag film layers 611a and 611b, the bag film layer 611 can be directly attached to the welding plane 527, and the two melt during welding to form a connecting weld. The connecting sheet 521 provides a welding plane 527 instead of an uneven welding surface. This can adapt to the thin sheet characteristics of the connecting sheet 521 itself. It can be directly fused with the bag film layer 611 by attaching during the welding process, and is easy to manufacture. The welding plane 527 can be as follows: Figure 5 The inclined plane shown can also be Figure 5 The vertical plane shown.

[0079] The bag connection end 61 and the first connection end 501 of the drainage bag connector 5 can be welded using power frequency pulse welding (also known as power frequency heating welding). With the wing structure 52, the drainage bag connector 5 is positioned between the two bag opening film layers 611, and a single welding operation is performed to seal the first bag body 6 and securely connect the first bag body 6 to the drainage bag connector 5. This welding process forms a sealing strip 65 that seals the bag connection end 61.

[0080] like Figure 7 、 Figure 8 As shown, the wing structure 52 is partially melted and integrated with the film layer during welding, and then the wing structure 52 has a fusion portion 525 fused with the bag opening film layer 611. The wing structure 52 in the state of being connected to the first bag body 6 ( Figure 8 The connecting sheet 5211 in the embodiment is compared with the wing structure 52 ( Figure 8The area or radial length of the connecting sheet 5212 is reduced. During the welding process, the wing structure 52 loses some area, and the lost area of the wing structure 52 is melted with the bag opening film layer 611 to form an integrated structure, which not only improves the connection area between the first bag body 6 and the drainage bag connector 5 as a whole, but also ensures the bonding strength between the two, ensuring the connection stability between the drainage bag connector 5 and the first bag body 6, and will not cause the problem of falling off. Figure 8 It can be seen from the diagram that the area or radial length of the connection sheet 5211 retained after welding is reduced compared to the connection sheet 5212 in the unconnected state.

[0081] The drainage bag connector 5 of this embodiment is provided with a wing structure 52, and the two bag opening film layers 611a and 611b are covered on the main tube 51 and span the main tube 51. The wing structures 52 are covered on both sides of the main tube 51. Even if there is a docking gap between the two bag opening film layers 611a and 611b, the corresponding docking gap can be filled by the presence of the wing structure 52. Of course, because of the presence of the wing structure 52, the two bag opening film layers 611 do not need to be tightly docked on one side of the main tube 51. They only need to be kept in close contact with the surface of the wing structure 52 for welding. This places lower requirements on the docking position of the entire drainage bag connector 5, and can achieve a higher yield rate, and accordingly, a higher welding and sealing quality.

[0082] In this embodiment, the wing structure 52 includes connecting sheets 521 (521a, 521b) distributed on both sides of the main tube 51. The connecting sheets 521 are thin sheets. In the unassembled state, the connecting sheets 521a and 521b are symmetrically distributed on both sides of the main tube 51. The thickness of the connecting sheets 521 is 0.01 to 1.5 mm, and the radial length is 1 to 10 mm. The length L1 of the connecting sheets 521 along the longitudinal direction H of the main tube is 1 to 10 mm, preferably 3 to 8 mm. There may be more than two connecting sheets 521, symmetrically distributed. The main tube 51 is provided with two or more wing structures 52 along its longitudinal direction H. Preferably, the connecting sheets 521 of the two wing structures 52 have the same shape. The connecting sheet 521 has an inner end connected to the main tube 51 and an outer end away from the main tube 51 . To fill the joint gap of the bag opening film layer 611 , the thickness of the connecting sheet 521 gradually decreases from the inner end to the outer end.

[0083] There are many shapes of the connecting sheet 521. In this embodiment, the shape of the connecting sheet (longitudinal section, Figure 3 The cross-section in the view shown is rectangular. Figure 6In the embodiments a, b, c, and d, the outer edge of the connecting sheet 521 may be serrated. In this case, the outer end of the connecting sheet 521 is provided with convex portions and concave portions arranged in a staggered manner along the length direction H of the main tube. The convex portions and concave portions may be arranged in a staggered manner at equal intervals or in an irregular arrangement. The convex portions and concave portions may be the same or different. Of course, it is preferred that the convex portions and concave portions have the same shape. Similarly, the cross-sectional shapes of the connecting sheets 521 of different wing structures 52 may also be different, such as Figure 5 As shown, the cross-section of the connecting sheet 521 is a triangular spike shape, a rectangle, an irregular shape, etc., and this application does not impose any limitation.

[0084] Considering that if the smooth main body tube is directly welded to the bag connection end 61, part of the outer wall of the main body tube melts and merges with the bag mouth film layer 611 of the bag connection end 61 during the welding process, and the melted part of the main body tube material is easy to overflow to form undesirable protruding foreign matter, affecting the welding quality on the inner side of the bag mouth film layer 611, resulting in poor sealing.

[0085] like Figure 3 As shown, to ensure the connection quality between the first connecting end 501 and the bag connecting end 61, the first connecting end 501 is further provided with a connecting protrusion 58 on the outer wall of the main tube 5151. The connecting protrusion 58 protrudes from the outer wall of the main tube 51. The width W2 of the connecting protrusion 58 along the length direction H of the main tube ranges from 0.5 mm to 2 mm. The height of the connecting protrusion 58 protruding from the outer wall of the main tube 51 ranges from 0.05 mm to 1 mm. The connecting protrusion 58 is distributed between the connecting sheets 521 on both sides of the main tube 51. One end of the connecting protrusion 58 extends continuously from one connecting sheet 521a to the other connecting sheet 521b. With the connecting sheet 521 as the symmetrical interface, the connecting protrusion 58 is distributed on both sides of the connecting sheet 521 in mirror symmetry.

[0086] Specifically, the outer wall area of the main body tube 51 corresponding to the wing structure 52 is the connection area, and the length of the connection area along the length direction H is equal to the length of the wing structure 52 along the length direction H, both of which are L1. Two or more connecting protrusions 58 are arranged and distributed in the connection area along the length direction H, and the interval between two adjacent connecting protrusions 58 is 0.5mm to 2mm. A filling groove is formed between two adjacent connecting protrusions 58. Among the multiple connecting protrusions 58, one connecting protrusion 58 is aligned with one side edge of the connecting sheet 521, and the other connecting protrusion 58 is aligned with the other side edge of the connecting sheet 521. In an embodiment with multiple wing structures 52 on the main body tube 51, as Figure 3 As shown, the main body tube 51 has two wing structures 52 (two pairs of connecting sheets 521 ), and correspondingly, the main body tube 51 has two connecting areas correspondingly provided with connecting protruding rings 58 .

[0087] By providing spaced-apart connecting convex rings 58 and forming filling grooves between the connecting convex rings 58, the connecting convex rings 58 melt first and overflow to the sides into the filling grooves during welding. This makes it difficult for protruding foreign matter to form in the connection area and affect the welding quality. The height of the connecting convex rings 58 gradually decreases under high-temperature welding, and gradually becomes flush with the overflow filling grooves to form a flat joint surface, which is welded and fused with the bag mouth film layer 611, thereby forming a connection structure with better welding quality. This connection structure can reduce the welding accuracy requirements for the drainage bag joint 5 and the welding head, provide a connection structure with better quality, and reduce the difficulty of the processing and manufacturing process.

[0088] like Figure 2 、 Figure 3 As shown, the bag connection end 61 has at least one welding strip 570 for welding the bag opening film layer 611 relative to each other; the number of the wing structures 52 is equal to the number of the welding strips 570, and they are aligned one by one in the width direction of the first bag body 6. The welding strips 570 are connected from the first bag body 6 in the width direction (facing the bag body 6). Figure 1 The bag connection end 61 and the drainage bag connector 5 are welded together to form the weld strip 570. The width W1 of the weld strip 570 in the longitudinal direction H of the main tube 51 is equal to the length L1 of the connecting sheet 521. Of course, both also have the same length as the connecting region along the longitudinal direction H.

[0089] On a disposable drainage bag, after welding, the connecting protrusion 58 and the filling groove 585 are roughly flush, forming a roughly flat welding surface with the bag opening membrane. Consequently, the weld strip 570 on the main tube 51 is a continuous weld along the length direction H, eliminating the spaced welds formed by the spaced connecting protrusions 58. This creates a connection structure with excellent sealing performance on the small-sized drainage bag connector 5. Similarly, the weld strip 570 on the connecting sheet is also a continuous weld along the length direction H.

[0090] The current Luer connector used in peritoneal dialysis requires repeated threaded insertion and removal from the PD external tube. To prevent wear or severe wear on the connector, the two parts of the Luer connector are constructed of PVC and TPEE. The TPEE connector allows for multiple connections to the external tube, reducing wear and leakage and extending the tube's lifespan. The PVC connector also provides a reliable connection to the delivery catheter. Furthermore, the materials and manufacturing processes (such as power-frequency welding and bonding) of this split-structure Luer connector are relatively mature, hindering the development of improved manufacturing processes.

[0091] like Figures 11 to 17As shown, compared with the above conventional designs, in this embodiment, the peritoneal dialysis three-way connector 10 is an integrated structure rather than a split structure. The peritoneal dialysis three-way connector 10 having the dialysis Luer connector 15, the liquid inlet connector 12, and the liquid outlet connector 11 is an integral injection-molded structure as a whole, and thus does not need to be manufactured separately and then assembled, thereby simplifying the assembly process and improving manufacturing efficiency. In addition, the peritoneal dialysis three-way connector 10 has no split connection parts, and its own structural strength is higher.

[0092] In the prior art, a split-structure PVC tee is inserted into a dialysis Luer connector and then high-frequency welded to produce and assemble a single peritoneal dialysis tee. The total production time is approximately 1 piece / 7 seconds. However, the injection molding time of the peritoneal dialysis tee 10 using the structure of this embodiment is 4 pieces / 15 seconds. This shows that this embodiment can greatly improve manufacturing efficiency, thereby saving manufacturing costs, and can also reduce the number of manual assembly steps, thereby improving the manufacturing process.

[0093] In this embodiment, the dialysis Luer connector 15 is made of the same non-PVC material as the inlet connector 12 and the outlet connector 11. Specifically, the dialysis Luer connector 15 comprises a base material and an elastic material; the base material and the elastic material account for at least 50% by weight; and the base material is PP or PE.

[0094] The peritoneal dialysis three-way connector 10 of this embodiment is made of a base material and an elastic material; the weight percentage of the base material and the elastic material is greater than 50%; the base material is PP, PE, or TPEE. Furthermore, the weight percentage of the base material and the elastic material can be between 50% and 97%. The elastic material is one or more of SEBS, EVA, POE, SBS, EPR, TPEE, EPDM, and SIS. In this way, the main materials of the membrane-covered dialysis three-way connector 10 and the transmission tube in this embodiment are both base material and elastic material. After the two are fitted together, they can form a fitting sealing structure due to the similar materials, which not only facilitates the connection between the two but also prevents connection leakage.

[0095] Compared to traditional PVC materials, the peritoneal dialysis three-way connector 10 or the transfer catheter in this application is more environmentally friendly. PVC tubing produces toxic substances when incinerated and currently can only be degraded and disposed of in landfills. However, the peritoneal dialysis three-way connector 10 or the transfer catheter in the embodiments of this application can be incinerated and is less likely to produce harmful substances during the incineration process.

[0096] In the peritoneal dialysis three-way connector 10, at least the dialysis Luer connector 15 is made of a transparent or translucent material. Considering that the entire peritoneal dialysis three-way connector 10 is made of a consistent material, its transparent or translucent material (similar to a frosted glass effect) allows the flow of fluid to be observed through the peritoneal dialysis three-way connector 10 during peritoneal dialysis, facilitating operation of the peritoneal dialysis external tube, reducing the chance of operational errors, and improving the user experience.

[0097] In this embodiment, the peritoneal dialysis three-way connector 10 is an integral structure, comprising a main tubing section 13 extending along the longitudinal direction (length direction F1). The main tubing section 13 is the primary component of the peritoneal dialysis three-way connector 10. A dialysis Luer connector 15, an inlet connector 12, and an outlet connector 11 are disposed on the main tubing section 13, forming the three-way peritoneal dialysis three-way connector 10. The main tubing section 13, the dialysis Luer connector 15, the inlet connector 12, and the outlet connector 11 are integrally formed by injection molding.

[0098] like Figure 11 、 Figure 12 、 Figure 13 、 Figure 14 As shown, the dialysis Luer connector 15 is provided at one end of the main pipe section 13 in the longitudinal direction F1; the liquid inlet connector 12 and the liquid outlet connector 11 are provided at the other end of the main pipe section 13. An end flange plate 16 is provided at one end of the main pipe section 13, and the dialysis Luer connector 15 is located on the side of the end flange plate 16 away from the main pipe section 13. The side wall of the main pipe section 13 is provided with a wing plate 14. The wing plates 14 are distributed on both sides of the main pipe section 13 to facilitate the user to apply force to produce relative rotation with the peritoneal dialysis external tube for assembly. The angle between the liquid inlet connector 12 and the liquid outlet connector 11 is an acute angle or a right angle. Preferably, the angle between the liquid inlet connector 12 and the liquid outlet connector 11 is set at an acute angle.

[0099] In this embodiment, the liquid outlet connector 11 is coaxially arranged with the main pipe section 13 and is located on the extension line of the main pipe section 13. It can form the same straight pipe section with the main pipe section 13. Similarly, the dialysis Luer connector 15 is located at the other end of the main pipe section 13. The dialysis Luer connector 15 and the liquid outlet connector 11 are respectively located at the two ends of the main pipe section 13, forming a coaxial straight pipe structure.

[0100] like Figures 11 to 14 As shown, the dialysis Luer connector 15 comprises an outer sleeve 150 and an inner connector 17 coaxially located within the outer sleeve 150. The outer sleeve 150 and the inner connector 17 are also integrally injection-molded to form a Luer connector structure. The dialysis Luer connector 15 is a female Luer connector that mates with the male Luer connector of the peritoneal dialysis external tube.

[0101] Specifically, the outer sleeve 150 has an outer diameter greater than that of the main tube section 13 and includes a plain section 151 and a connecting section 152 located on the side of the plain section 151 adjacent to the main tube section 13. The inner wall of the plain section 151 is smooth, facilitating insertion of the male Luer connector of the peritoneal dialysis external tube. Furthermore, the connecting section 152 is located on the inner side of the plain section 151 and has a threaded inner wall that cooperates with the inner connector 17 to form a Luer structure, thereby threadedly connecting to the male Luer connector of the peritoneal dialysis external tube.

[0102] To facilitate connection to the peritoneal dialysis external tube and prevent wear and damage from repeated connections, the outer tube sleeve 150 is primarily constructed from a base material and an elastic material. It is flexible overall and possesses a specific elastic modulus. To accommodate connections to the peritoneal dialysis external tube, the outer tube sleeve 150 has a wall thickness of 0.1 to 3 mm and a hardness of 30 to 60 Shore D. This combination of hardness and wall thickness reduces wear on the tube during connection, ensuring its longevity.

[0103] Optionally, to enhance sealing performance and prevent leakage, a sealing step 155 is provided within the outer sleeve 150. The sealing step 155 is located on the inner wall of the plain-walled section 151. Thus, the inner wall of the outer sleeve 150 forms a stepped hole structure, which interfaces with the corresponding structure of the male Luer connector of the peritoneal dialysis external tube via the sealing step 155, forming a snug seal. Of course, the end of the connecting section 152 also forms an end step, with the sealing step 155 located on the outside of the end step (on the side away from the liquid outlet connector 11). The inner diameter of the connecting section 152 is somewhat smaller than that of the plain-walled section 151, and thus, the internal thread provided on the connecting section 152 avoids reducing the thickness of the connecting wall and ensures connection strength.

[0104] In this embodiment, the end of the first transmission tube 3 is non-adhesively fitted over the liquid inlet connector 12. The end of the second transmission tube 4 is non-adhesively fitted over the liquid outlet connector 11. The ends of the transmission tubes are butt-extruded by cold-pushing (not heating, for example, at room temperature) to expand them, allowing the liquid inlet connector 12 and the liquid outlet connector 11 to be inserted into the corresponding first transmission tube 3 and second transmission tube 4, respectively. The ends of the first transmission tube 3 and second transmission tube 4, relying on their own elastic retraction properties, adhere tightly to the outer walls of the internally fitted liquid inlet connector 12 and liquid outlet connector 11, forming a seal.

[0105] The first transmission tube 3 and the second transmission tube 4 of this embodiment are connected to the liquid inlet connector 12 and the liquid outlet connector 11, and there is no need to heat them to soften them before docking and inserting them. Therefore, the first transmission tube 3 and the second transmission tube 4 of this embodiment are non-adhesive to the liquid inlet connector 12 and the liquid outlet connector 11. After heating, the pipe ends and the connectors will form a certain degree of adhesion after being attached. The pipe end connection structure of this embodiment does not produce this, and it relies on elastic retraction to form a seal with the outer wall of the internally sleeved liquid inlet connector 12 and the liquid outlet connector 11. When the pipe end connector connection structure is longitudinally cut open, there is no adhesive layer between the two, and they are in a physically close state. The non-adhesive fixed connection method can be used to mechanically push the pipe end into the outside of the connector without manual pushing, thereby improving manufacturing efficiency.

[0106] The ends of the first and second transmission tubes 3 and 4 are fitted over the liquid inlet connector 12 and the liquid outlet connector 11 by deforming; this deformation primarily involves elastic deformation. Of course, the ends of the first and second transmission tubes 3 and 4 may also undergo a certain degree of plastic deformation, which is not a limitation in this application. After the first and second transmission tubes 3 and 4 are removed from the liquid inlet connector 12 and the liquid outlet connector 11, the ends of the first and second transmission tubes 3 and 4 can recover their shape to a certain extent.

[0107] like Figures 14 to 17 As shown, to enhance the connection strength between the first and second transfer tubes 3 and 4 and the corresponding liquid inlet connectors 12 and liquid outlet connectors 11, at least one of the liquid inlet connectors 12 and 11 is provided with at least one connection step 113 facing toward the main tube section 13. The connection step 113 is fixedly sleeved within the transfer tubes. The width of the connection step 113 ranges from 1 to 20 mm.

[0108] The connecting step 113 can form a hook structure for the end of the transmission pipe. The transmission pipe shrinks and changes diameter when it passes through the connecting step 113 under the condition of its own elastic recovery, and then the connecting step 113 hooks the transmission pipe, forming a stop for the transmission pipe. Figure 15 As shown, the stability of the connection is ensured by forming a physical hook structure on the basis of the close connection between the two. The outer edges of the ends of the liquid inlet connector 12 and the liquid outlet connector 11 have chamfered ends 119 to reduce the outer diameter of the ends to be smaller than the inner diameter of the transmission tube (the first transmission tube 3, the second transmission tube 4). The diameter at the port of the chamfered end 119 is smaller than the inner diameter of the transmission tube (the first transmission tube 3, the second transmission tube 4). In this way, it is convenient to insert the ends of the liquid inlet connector 12 and the liquid outlet connector 11 into the tube ends of the transmission tubes when squeezing and pushing, and gradually push in to expand the tube ends of the transmission tubes. Of course, the outermost (facing Figure 4 The expansion section 111 (which is the lowest when the transmission pipe is in the bottom position) may be a conical structure to facilitate squeezing in and expanding the end of the transmission pipe.

[0109] Specifically, at least one of the liquid inlet connector 12 and the liquid outlet connector 11 is provided with a reduced diameter section 112 and an expanded section 111. The annular interface between the reduced diameter section 112 and the expanded section 111 forms the connecting step 113. The reduced diameter section 112 is located on the side of the expanded section 111 close to the main pipe section 13. The outer diameter of the reduced diameter section 112 is larger than the inner diameter of either the first transmission pipe 3 or the second transmission pipe 4. Furthermore, when the first portion 36 of the corresponding reduced diameter section 112 is retracted, the pipe end of the transmission pipe is still in a state of being expanded by the reduced diameter section 112, and is in close contact with the outer wall of the reduced diameter section 112 (non-adhesive contact), thereby improving the connection strength and ensuring the sealing performance.

[0110] like Figure 15 As shown, the end of the transmission pipe primarily comprises a first portion 36 that sleeves over the reduced diameter section 112 and a second portion 35 that sleeves over the expanded section 111. The inner diameter of the first portion 36 is larger than the inner diameter of the transmission pipe (not the end portion). That is, the first portion 36 remains enlarged by the reduced diameter section 112, ensuring a tight seal between the two. The second portion 35 sleeves over the expanded section and closely adheres to its outer wall.

[0111] To form an effective physical hooking structure, the length of the reduced diameter section 112 is greater than one-third of the inner diameter of the first or second transfer tube 3 or 4, that is, L ≥ D / 3, where L is the length of the reduced diameter section 112 and D is the inner diameter of the first or second transfer tube 3 or 4. For example, if the inner diameter of the first transfer tube 3 is 6 mm, the length of the reduced diameter section 112 is greater than 2 mm.

[0112] The expansion section 111 is a cylindrical or conical structure. Figure 16 、 Figure 17 As shown, both the liquid inlet connector 12 and the liquid outlet connector 11 can have multiple connecting steps 113, forming a multi-level physical hooking structure rather than a chemical connection, ensuring the connection strength between the first and second transmission tubes 3 and 4 and the corresponding liquid inlet connector 12 and liquid outlet connector 11. Accordingly, multiple expansion sections 111 (111a, 111b), contraction sections 112 (112a, 112b), and connecting steps 113 (113a, 113b) can be provided. Preferably, the expansion sections 111 are provided with one, two, or three, and the contraction sections 112 are provided with one, two, or three.

[0113] Of course, the structure of the second connecting end 502 in the above embodiment and the structure of the liquid inlet connector 12 or the liquid outlet connector 11 can be combined with each other for reference; the connection method of the drainage bag connector 5 and the second transmission tube 4 can also be combined with the connection method of the liquid inlet connector 12 or the liquid outlet connector 11 and the first transmission tube 3 or the second transmission tube 4, and the descriptions of the reduced diameter portion 56 and the reduced diameter section 112, and the expansion portion 55 and the expansion section 111 can also be combined with each other for reference, and no further details will be given in this application.

[0114] like Figures 1 to 20 As shown, the embodiment of the present application further provides a drainage bag connector 5, which is an injection-molded integral structure and has a first connection end 501 and a second connection end 502 along its length; the second connection end 502 is used to fixedly connect to the transmission catheter 30. The first connection end 501 is used to fixedly connect to the liquid storage bag 6.

[0115] The first connecting end 501 includes a longitudinally extending main tube 51 and a wing structure 52 integrally formed on the outer side wall of the main tube 51. The wing structure 52 includes connecting tabs 521 symmetrically arranged on either side of the main tube 51. The connecting tabs 521 have two opposing welded flat surfaces 527. The longitudinal extension direction is the length direction of the drainage bag connector 5.

[0116] The drainage bag connector 5 can be used to manufacture a disposable drainage bag. A disposable drainage bag is used to drain fluids such as urine, wound drainage, bleeding, or accumulated fluid. The liquid storage bag 6, also known as a waste liquid bag, is in an empty and flat state before use. During use, the drainage fluid is drained into the liquid storage bag 6 for storage.

[0117] This application also provides Figure 18 、 Figure 19 The disposable drainage bag shown includes a fluid reservoir 6, a drainage bag connector 5, and a transfer tube 30. The fluid reservoir 6 is used to collect drained fluid. The first connection end 501 of the drainage bag connector 5 is fixedly connected to the fluid reservoir 6. The transfer tube 30 has a connector 10 at one end and is fixedly sleeved over the second connection end 502 of the drainage bag connector 5 at the other end.

[0118] The connecting connector 10 includes a Luer connector, such as Figure 1 Female Luer connector as shown or Figure 2 Male Luer connector as shown. Figure 1 As shown, the connector is also removably covered with a protective cap 8. The protective cap 8 removably covers the dialysis Luer connector 15. The protective cap 8 is a flexible, non-PVC material that covers the dialysis Luer connector 15 to prevent contamination of the connector. The protective cap 8 has a pull ring that allows the user to remove the protective cap 8 from the connector. The connector can be used to connect a drainage tube.

[0119] In this embodiment, the transmission conduit 30 is made of non-PVC material and may be provided with a liquid stop clip 40. Specifically, the transmission conduit 30 is made of a base material and an elastic material; the base material and the elastic material account for more than 50% by weight; the base material is PP or PE.

[0120] like Figure 1 、 Figure 2 As shown, the disposable drainage bag includes a liquid storage bag 6 and a drainage bag connector 5 fixedly connected to one end of the liquid storage bag 6. The end of the liquid storage bag 6 connected to the drainage bag connector 5 is a bag connection end 61. The drainage bag connector 5 is an injection-molded one-piece structure. The drainage bag connector 5 is made of non-PVC material. The material of the drainage bag connector 5 includes a base material and an elastic material. Among them, the base material and the elastic material are the main component materials of the drainage bag connector 5, and the weight percentage of the base material and the elastic material is more than 50%; the base material is PP or PE. The elastic material is one or more of SEBS, EVA, POE, SBS, EPR, TPEE, EPDM and SIS.

[0121] like Figures 21 to 27 In one embodiment of the present application, a drainage bag connector 5 is provided. The drainage bag connector 5 is an injection-molded integral structure having a first connection end 501 and a second connection end 502 along its length. The second connection end 502 is used to fixedly connect to the transmission tube 30 (such as the first transmission tube 3 or the second transmission tube 4 mentioned above). The first connection end 501 is used to fixedly connect to the liquid storage bag 6. The drainage bag connector 5 can be formed with the transmission tube 30 and the connection connector 10 as shown in FIG. Figure 21 The connection method of the disposable drainage bag shown, the drainage bag connector 5 and the bag connection end 61 can refer to the description in the above embodiment, and will not be repeated here. Of course, the disposable drainage bag can refer to the contents described in the above embodiment, and the repeated parts will not be repeated here.

[0122] The drainage bag connector 5 comprises a longitudinally extending main tube 51 and a wing structure 52 integrally formed on the outer wall of the main tube 51. The wing structure 52 comprises connecting tabs 521 symmetrically arranged on either side of the main tube 51, each having two opposing welded flat surfaces. The main tube 51 is a straight tube, with its outer diameter remaining constant as it extends from the first connecting end 501 to the second connecting end 502.

[0123] The material of the main tube 51 is similar to or the same as that of the transmission tube 30. The inner diameter of the main tube 51 is larger than the inner diameter of the transmission tube 30. The outer diameter of the main tube 51 is larger than the outer diameter of the transmission tube 30.

[0124] In this embodiment, the connecting sheet 521 is symmetrically arranged on the outer wall of the main body tube 51 of the straight tube structure. The length of the connecting sheet 521 is greater than Figure 2 、 Figure 3 The connection sheet 521 of the drainage bag connector is shown. Figure 21 、 Figure 22 As shown, the connecting sheet 521 extends continuously from at least one weld strip to another weld strip. Furthermore, the connecting sheet 521 continuously spans all weld strips. To facilitate manufacturing and improve manufacturing efficiency, the connecting sheet 521 extends from one end of the main tube 51 to the other end of the main tube 51. The length of the connecting sheet 521 is equal to that of the drainage bag connector 5 (or the main tube 51). Of course, it can also be as Figure 30 As shown, the connecting sheet 521 has a longer length and only needs to span multiple weld strips, and does not need to be the same length as the main tube 51. For example, the length of the connecting sheet 521 is more than 0.5 times the length of the main tube 51.

[0125] Specifically, the length of the connecting sheet 521 (the length in the longitudinal direction of the main tube 51) is greater than 0.02 mm, and can be between 0.02 mm and 20 mm, preferably between 5 mm and 15 mm. The thickness of the connecting sheet 521 is 0.05-2 mm.

[0126] Of course, the thickness and radial length (width) of the connecting sheet 521 can refer to the description in the above embodiment, and will not be repeated here.

[0127] One end of the transmission catheter 30 is connected to a connecting connector 10, and the other end is fixedly sleeved inside the second connecting end 502 of the drainage bag connector 5. One end of the transmission catheter 30 is fixedly bonded to the inside of the main body tube 51 of the drainage bag connector 5. The material of the drainage bag connector 5 and the transmission catheter 30 are similar or the same, so the two can be directly bonded after being sleeved, and the bonding quality is strong. The second connecting end 502 is heated to expand and soften, and then one end of the transmission catheter 30 is inserted into the second connecting end 502. After cooling, it is bonded and fixed without the need for glue or adhesive. Of course, after one end of the transmission catheter 30 is inserted into the second connecting end 502, it can be heated again so that both are in a non-melting expanded and softened state and then naturally cooled.

[0128] In a preferred connection method, one end of the transmission catheter 30 and the second connection end 502 can be directly cold-plugged. The outer diameter of the insertion end of the transmission catheter 30 is larger than the inner diameter of the second connection end 502, and the inner diameter of the second connection end 502 is smaller than the outer diameter of the insertion end of the transmission catheter 30. The inner diameter of the second connection end 502 is 1%-50% smaller than the outer diameter of the insertion end of the transmission catheter 30. After the second connection end 502 is expanded and inserted into one end (the insertion end) of the transmission catheter 30, it is released and then contracted to fit against the transmission catheter 30. The two materials are similar or identical, and thus, when fitted together, a secure connection is formed. Through the cold plugging method, the insertion end of the transmission catheter 30 is non-adhesively fitted within the second connection end 502.

[0129] The cold-plug connection between the transfer catheter 30 and the second connection end 502 is applicable to the drainage bag connector 5 and the second transfer tube 4 described above. It is understood that in this case, the second connection end 502 is fixedly connected to the second transfer tube 4, while the first connection end 501 is fixedly connected to the fluid storage bag. The second connection end 502 is non-adhesively fitted over one end of the second transfer tube 4. To ensure a secure connection, the outer diameter of the second transfer tube 4 is larger than the inner diameter of the second connection end 502. Specifically, the outer diameter of the second transfer tube 4 is 1%-50% larger than the inner diameter of the second connection end 502, meaning that the outer diameter of the second transfer tube 4 is 1.01 to 1.5 times the inner diameter of the second connection end 502. The drainage bag connector 5 is an integral injection-molded structure made of the same material as the second transfer tube 4. One end of the second transfer tube 4 is inserted into the second connection end 502 via cold plugging. The length of the second transfer tube 4 inserted into the second connection end 502 ranges from 2 mm to 30 mm. The length of the second transmission tube 4 inserted into the second connection end 502 is one third to four times the inner diameter of the second transmission tube 4 .

[0130] Further research revealed that after the high-temperature sterilization process, the hooking structure connecting the above-mentioned connector and the transmission tube had different expansion properties at high temperatures and different retraction properties after cooling due to the different materials of the connector and the transmission tube (transmission conduit), which led to the destruction of the hooking strength of the hooking structure between the connector and the transmission tube. Another problem was that the fitting seal between the two was destroyed, which led to a decrease in yield after the sterilization process.

[0131] To solve the above problems, see Figures 21 to 29 , an embodiment of the present application further provides a connecting joint 10, the improved structure of the connecting joint 10 can be applied to the drainage bag joint 5, the three-way joint 10, or the like of the above-mentioned embodiment. Figure 29 Of course, any Luer connector with a hooking structure between the connector and the transfer tube can adopt the improved structure of this embodiment.

[0132] In this embodiment, the connecting joint 10 comprises a joint body and a connecting ring 80 provided on the joint body. The joint body comprises a diameter-reducing section 112 (or diameter-reducing portion) and an expansion section 111 (or expansion portion). The annular interface between the diameter-reducing section 112 and the expansion section 111 forms the connecting step 113 (or vertical step). The joint body may be the drainage bag joint 5, the tee joint 10, or the like of the above-mentioned embodiment. Figure 29 The Luer connector shown, accordingly, includes a connecting ring 80 as an improved structure that can be applied to the connector of the above embodiment.

[0133] A connecting ring 80 is fixedly sleeved outside the contraction section 112. The connecting ring 80 is sealed with the outer wall of the contraction section 112. The connecting ring 80 is sleeved on the outer wall of the contraction section 112 in an elastic contraction manner to ensure a seal between the two. Furthermore, in order to prevent the connecting ring 80 from shifting during the cold insertion of the joint, a stop structure is also fixedly provided outside the contraction section 112. The connecting ring 80 is sleeved on the outside of the contraction section 112 between the stop structure and the connecting step 113 in an elastic contraction manner. Figure 34 As shown, the stop structure is used to avoid the problem of poor connection effect caused by the connection ring 80 retreating during the cold plugging process.

[0134] The stop structure is a protruding structure fixedly connected to the outer wall of the contraction section 112. It can be a single protruding block structure, or a plurality of circumferentially spaced protruding blocks, or a protruding ring structure. The stop ring 77 is made of the same material as the connector body, and can be the connector body structure itself. Figure 31 As shown, the stop structure includes a stop ring 77 that is integrally molded with the connector body. The outer diameter of the stop ring 77 is less than or equal to the outer diameter of the connecting ring. The stop ring 77 is roughly located in the middle of the reduced diameter section, thereby reserving sufficient length for the transmission pipe to be installed. The stop ring 77 is applied to the connector in the above embodiment and its structure is as follows Figure 31 、 Figure 32 、 Figure 33 shown.

[0135] In addition, in a feasible embodiment, the connecting ring 80 can be directly injection-molded outside the contraction section 112 . In this case, there is no need to provide a stop structure, and the connecting ring 80 is sealed to the outer wall of the contraction section 112 .

[0136] The material of the connecting ring 80 is different from that of the connector (main body), that is, the material of the connecting ring 80 is different from that of the drainage bag connector 5 and the tee connector 10 described above. The material of the connecting ring 80 is similar to or the same as that of the transfer tube (transfer conduit 30). The connecting ring 80 is positioned at the outer end of the contraction section 112, near the connection step 113. The outer diameter of the connecting ring 80 is greater than or equal to the outer diameter of the expansion section 111, and greater than or equal to the outer diameter of the connection step 113. Preferably, the outer diameter of the connecting ring 80 is greater than the outer diameter of the connection step 113 (or the expansion section 111) by at least 0.1 mm. For example, the outer diameter of the connecting ring 80 is greater than the outer diameter of the connection step 113 (or the expansion section 111) by 0.1 mm to 2 mm. This allows the protruding connecting ring 80 to maintain a sealed fit with the transfer conduit 30 and maintain the stability of the hooking structure after high-temperature sterilization.

[0137] In this embodiment, the elastic modulus of the connecting ring 80 is greater than that of the connector body, thereby providing sufficient expansion to seal against the inner wall of the transmission conduit 30 after high-temperature sterilization. Figure 3 H direction) about 0.5-10mm.

[0138] The connecting ring 80 is made of non-PVC material. The material of the connecting ring 80 is the same as or similar to that of the transmission catheter 30. The material of the connecting ring 80 includes a base material and an elastic material. Among them, the base material and the elastic material are the main component materials of the drainage bag connector 5, and the weight percentage of the base material and the elastic material is more than 50%; the base material is PP or PE. The elastic material is one or more of SEBS, EVA, POE, SBS, EPR, TPEE, EPDM and SIS. The weight percentage of the elastic material of the connecting ring 80 is greater than the weight percentage of the elastic material of the connector body. The material of the connecting ring 80 is the same as or similar to that of the transmission catheter 30. After the high-temperature sterilization process, the two can form a material fusion, and then the material of the connecting ring 80 and the transmission catheter 30 form a stable bonding seal.

[0139] The material of the connecting ring 80 can be pure EVA, POE, POP, SEBS, or a material primarily composed of PP with an added elastic material. The added elastic material exhibits a certain degree of viscosity at room temperature or at elevated temperatures (40-150°C). Alternatively, in high-temperature environments, the material of the connecting ring 80 and the transmission conduit 30 can form strong intermolecular bonds, such as adhesion, fusion, or strong intermolecular bonding.

[0140] The connecting ring 80 can be a circular ring, and its cross section is also circular. The connecting ring 80 can also have various shapes and styles, such as Figure 26 、 Figure 27As shown, the cross-section of the connecting ring 80 can be triangular (inverted cone), rectangular, trapezoidal or irregular (special-shaped circular ring), and this application does not limit this. The connecting ring 80 can be one or more than two, and this application also does not limit this.

[0141] It should be noted that the drainage bag connectors and disposable drainage bags in various embodiments of the present application can be referenced to each other, and the repeated parts will not be repeated.

Claims

1. A drainage bag connector, characterized in that: The drainage bag connector is an injection-molded integral structure having a first connecting end and a second connecting end along its length; the second connecting end is used for fixedly connecting to the transmission catheter; In which, the second connecting end is provided with a reduced diameter portion and an expanded portion; the reduced diameter portion is located on the side of the expanded portion close to the first connecting end, and the annular boundary surface between the reduced diameter portion and the expanded portion forms a vertical step; the vertical step is fixedly sleeved inside the transmission conduit; a connecting ring is fixedly sleeved outside the reduced diameter portion; the connecting ring is sealed with the outer wall of the reduced diameter portion; the elastic modulus of the connecting ring is greater than the elastic modulus of the joint body.

2. The drainage bag connector according to claim 1, wherein: A stop structure is fixedly provided on the outside of the reduced diameter portion; and the connecting ring is sleeved on the outside of the reduced diameter portion between the stop structure and the vertical step in an elastically shrinking manner.

3. The drainage bag connector according to claim 2, wherein: The stop structure comprises a stop ring which is integrally injection-molded with the joint body; the outer diameter of the stop ring is smaller than or equal to the outer diameter of the connecting ring.

4. The drainage bag connector according to claim 1, wherein: The material of the connecting ring is different from that of the drainage bag connector, and both are non-PVC materials.

5. The drainage bag connector according to claim 1, wherein: The material of the connecting ring is the same as that of the transmission conduit.

6. The drainage bag connector according to claim 1, wherein: The weight percentage of the elastic material of the connecting ring is greater than the weight percentage of the elastic material of the drainage bag connector.

7. The drainage bag connector according to claim 1, wherein: The outer diameter of the connecting ring is greater than or equal to the outer diameter of the vertical step.

8. The drainage bag connector according to claim 1, wherein: The outer diameter of the connecting ring is greater than the outer diameter of the vertical step by more than 0.1 mm.

9. The drainage bag connector according to claim 1, wherein: The first connecting end includes a longitudinally extending main body tube and a wing portion integrally provided on the outer side wall of the main body tube; the wing portion includes connecting sheets symmetrically provided on both sides of the main body tube, and the connecting sheets have two oppositely facing welding planes.

10. A disposable drainage bag, characterized in that: include: a fluid storage bag for collecting the discharged drainage fluid; The drainage bag connector according to any one of claims 1 to 9, wherein the first connecting end of the drainage bag connector is fixedly connected to the liquid storage bag; The transmission catheter has one end connected to a connecting joint, and the other end is fixedly sleeved outside the second connecting end of the drainage bag joint.

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