Disposable drainage bag

Abstract

The utility model discloses a disposable drainage bag which comprises a first bag body, and the first bag body comprises a liquid storage bag with a bag connecting end and a drainage bag connector fixedly connected with the bag connecting end; the bag connecting end is provided with oppositely connected bag opening film layers; the drainage bag connector is provided with a body tube and a wing structure integrally arranged on the outer side wall of the body tube. One end of the body pipe and the wing structure are welded between the bag opening film layers, and the wing structure is flatly laid between the two bag opening film layers; the wing structure comprises connecting sheets symmetrically distributed on the two sides of the body pipe. The bag connecting end is provided with more than two welding seam strips for oppositely welding the bag opening film layers; the connecting sheet at least continuously extends from one weld strip to another weld strip.

Description

Technical Field

[0001] This application relates to the field of medical supplies, and particularly to a disposable drainage bag. Background Art

[0002] Peritoneal dialysis utilizes the property of the peritoneum as a semi-permeable membrane. Through the action of gravity, the prepared dialysate is regularly and periodically infused into the peritoneal cavity of the patient through a catheter. Due to the concentration gradient difference of solutes on both sides of the peritoneum, solutes on the high-concentration side move to the low-concentration side (diffusion); water moves from the low-osmotic side to the high-osmotic side (osmosis). By continuously replacing the peritoneal dialysis fluid, the purpose of removing metabolites, toxic substances in the body and correcting water and electrolyte balance disorders is achieved.

[0003] In the existing technology, for continuous ambulatory peritoneal dialysis (CAPD), the patient can manually replace the dialysate by themselves. For example, the dialysate can be replaced 2 to 5 times a day. The luer three-way joint used in the existing peritoneal dialysis drainage bag to cooperate with the external peritoneal dialysis tube is a split structure. Not only does it need to be separately manufactured in terms of technology, but also the overall manufacturing and assembly process of the peritoneal dialysis drainage bag is complex. Usually, manual docking and assembly are adopted, resulting in low manufacturing efficiency, and it also affects the increase in cost as a disposable medical consumable.

[0004] In addition, when the joint used in the existing waste liquid bag for peritoneal dialysis is inserted into the bag end of the waste liquid bag for welding, the membrane layers on the upper and lower sides of the joint tube need to face and adhere to each other and wrap the joint tube during the docking process. At this time, if the position accuracy of the joint tube is insufficient or the accuracy of the welding head itself decreases, it is easy to cause a docking gap at the near joint tube of the two membrane layers during docking, unable to form an effective seal, and thus resulting in the production of unqualified products. As a follow-up, the joint tube of the existing waste liquid bag is bonded with a glue when connecting to the PVC catheter, and its assembly process is also relatively complex and requires manual operation, which not only affects the manufacturing efficiency but also restricts the manufacturing cost. Utility Model Content

[0005] In view of the deficiencies of the current peritoneal dialysis drainage bag, an object of this application is to provide a disposable drainage bag that can simplify the assembly process and save manufacturing costs.

[0006] To achieve the above at least one object, this application adopts the following technical solutions:

[0007] A disposable drainage bag, comprising:

[0008] A first bag body, the first bag body comprising: a liquid storage bag having a bag connection end and a drainage bag joint fixedly connected to the bag connection end;

[0009] The bag connection end has relatively connected bag mouth film layers; the drainage bag connector has a body tube and a wing structure integrally arranged on the outer side wall of the body tube; one end of the body tube and the wing structure are welded between the bag mouth film layers, and the wing structure is laid flat between the two bag mouth film layers; the wing structure includes connecting thin sheets symmetrically distributed on both sides of the body tube; the bag connection end has more than two weld strips for relatively welding the bag mouth film layers; the connecting thin sheet continuously extends from at least one weld strip to another weld strip.

[0010] Preferably, the drainage bag connector is an injection-molded integral structure, which has a first connection end and a second connection end along its length direction; the first connection end is fixedly connected to the liquid storage bag; the second connection end is fixedly connected to the transmission catheter; the body tube is a straight tube, and the outer diameter of the body tube remains unchanged from the first connection end to the second connection end.

[0011] Preferably, the length of the connecting thin sheet is more than 0.5 times the length of the body tube.

[0012] Preferably, the connecting thin sheet continuously spans all the weld strips.

[0013] Preferably, the material of the body tube is similar to or the same as the material of the transmission catheter; the inner diameter of the body tube is larger than the inner diameter of the transmission catheter; the outer diameter of the body tube is larger than the outer diameter of the transmission catheter.

[0014] Preferably, the connecting thin sheet extends from one end of the body tube to the other end of the body tube, and the length of the connecting thin sheet is equal to the length of the body tube.

[0015] Preferably, one end of the transmission catheter is fixedly sleeved inside the second connection end of the drainage bag connector; one end of the transmission catheter is cold inserted and connected to the second connection end.

[0016] Preferably, the outer diameter of the insertion end of the transmission catheter is larger than the inner diameter of the second connection end.

[0017] Preferably, the inner diameter of the second connection end is 1% - 50% smaller than the outer diameter of the insertion end of the transmission catheter.

[0018] Preferably, the length of the transmission catheter inserted into the second connection end is one-third to four times the inner diameter of the transmission catheter.

[0019] Beneficial effects:

[0020] In the present utility model, the existence of the wing structure can fill the docking gap when two bag mouth film layers are docked. Of course, more because of the existence of the wing structure, the two bag mouth film layers do not need to be closely docked on one side of the main body tube. They only need to be kept close to the surface of the wing structure for welding. In this way, the requirements for the docking position of the entire drainage bag joint are lower, and a higher yield can be obtained. Correspondingly, the welding and sealing quality is higher. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 is a schematic structural diagram of a disposable peritoneal dialysis set provided by an embodiment of the present utility model;

[0022] Figure 2 is Figure 1 a schematic structural diagram of the first bag body;

[0023] Figure 3 is Figure 2 a schematic structural diagram of the drainage bag joint in

[0024] Figure 4 is Figure 3 a sectional view A-A and partial enlarged view of

[0025] Figure 5 is to provide Figure 4 six different sectional shape schematic diagrams of the connecting sheet in

[0026] Figure 6 is to provide 4 different shapes of Figure 2 a schematic structural diagram of the drainage bag joint in

[0027] Figure 7 is Figure 3 a sectional connection schematic diagram of the connecting sheet and the bag mouth film layer in

[0028] Figure 8 is a sectional comparison schematic diagram of the connecting sheet before and after welding with the bag mouth film layer;

[0029] Figure 9 is Figure 1 a sectional connection structural diagram of the drainage bag joint and the second transmission tube of

[0030] Figure 10 is a sectional connection structural diagram of the drainage bag joint and the second transmission tube provided by another embodiment of the present utility model;

[0031] Figure 11 is Figure 1 a three-dimensional diagram of the peritoneal dialysis three-way joint structure of

[0032] Figure 12 is Figure 11 another view of

[0033] Figure 13 is Figure 12 the front view of

[0034] Figure 14 the front view of the peritoneal dialysis three-way joint structure provided by another embodiment of the present utility model;

[0035] Figure 15 the schematic diagram of the connection between the transmission tube and the joint provided by another embodiment of the present utility model;

[0036] Figure 16 the front view of the peritoneal dialysis three-way joint structure provided by another embodiment of the present utility model;

[0037] Figure 17 the front view of the peritoneal dialysis three-way joint structure provided by another embodiment of the present utility model;

[0038] Figure 18 the schematic diagram of the disposable drainage bag structure provided by another embodiment of the present application;

[0039] Figure 19 the schematic diagram of the disposable drainage bag structure provided by another embodiment of the present application;

[0040] Figure 20 is Figure 19 the three-dimensional structure diagram of the drainage bag joint of

[0041] Figure 21 the schematic diagram of the disposable drainage bag structure provided by another embodiment of the present application;

[0042] Figure 22 is Figure 21 the schematic diagram of the drainage bag joint structure of

[0043] Figure 23 is Figure 21 the three-dimensional structure diagram of the connection joint of

[0044] Figure 24 the front view of the structure of the connection joint in another embodiment;

[0045] Figure 25 is Figure 23 the schematic diagram of the connection between the connection joint and the transmission tube of

[0046] Figure 26 the schematic diagram of the structure of the connection joint in another embodiment;

[0047] Figure 27 the front view of the structure of the connection joint in another embodiment;

[0048] Figure 28 the front view of the structure of the connection joint in another embodiment;

[0049] Figure 29 It is the front view of the structure of the connecting joint in another embodiment;

[0050] Figure 30 It is the schematic connection diagram of the drainage bag joint and the transfer tube catheter provided by another embodiment;

[0051] Figure 31 It is the front view of the structure of the connecting joint provided by another embodiment;

[0052] Figure 32 It is the front view of the structure of the connecting joint provided by another embodiment;

[0053] Figure 33 It is the front view of the structure of the connecting joint provided by another embodiment;

[0054] Figure 34 is Figure 31 The schematic connection diagram of the connecting joint and the transfer tube catheter. Specific embodiments

[0055] As Figures 1 to 17 、 Figure 20 shown, an embodiment of the present application provides a disposable drainage bag, which is specifically a disposable peritoneal dialysis drainage bag, including: a first bag body 6 and a transfer tube assembly 50. Among them, the first bag body 6 is used to collect the liquid discharged during peritoneal dialysis. Specifically, the first bag body 6 can be used as a waste liquid bag to collect the waste liquid or body fluid output from the human abdominal cavity to the outside during peritoneal dialysis.

[0056] Of course, in other embodiments, a disposable drainage bag as Figure 18 、 Figure 19 shown can also be provided to drain urine, wound drainage fluid, oozing blood or effusion. Its liquid storage bag 6 can also be called a waste liquid bag, which is in a flat empty bag state before use and drains the drainage fluid into the liquid storage bag 6 for storage during use.

[0057] As Figure 1 shown, the transfer tube assembly 50 includes a first transfer tube 3, a second transfer tube 4, a protective cap 8 and a peritoneal dialysis three-way joint 10. As Figures 2 to 8As shown, the peritoneal dialysis three-way connector 10 has a dialysis Luer connector 15, a liquid inlet connector 12, and a liquid outlet connector 11. The protective cap 8 is detachably covered on the dialysis Luer connector 15. The protective cap 8 is a flexible protective cap 8 made of non-PVC material. When it is covered on the dialysis Luer connector 15, it can prevent the dialysis Luer connector 15 from being contaminated. The protective cap 8 has a pull ring, and by virtue of the pull ring, the user can pull the protective cap 8 off the peritoneal dialysis three-way connector 10. The dialysis Luer connector 15 is used to connect the external peritoneal dialysis tube (peritoneal dialysis external tube). The external peritoneal dialysis tube is used to connect the transfer tube assembly 50 and the peritoneal catheter outside the body, and can block or allow the flow of peritoneal dialysis fluid or waste fluid. The external peritoneal dialysis tube is connected to the dialysis Luer connector 15 in a male-female Luer connector manner.

[0058] This disposable peritoneal dialysis drainage bag can form a peritoneal dialysis set with the second bag body 20. The second bag body 20 is a solution bag, which can also be called a medicine solution bag, and it contains peritoneal dialysis medicine solution inside, and the whole is in a rectangular bag structure. 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 communicates with the second bag connection end 25.

[0059] In this embodiment, the transfer tubes (the first transfer tube 3 and the second transfer tube 4) of this 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 catheters and also transfer hoses. One end of the first transfer tube 3 is fixedly communicated with the liquid inlet connector 12, and the other end is used to communicate with the second bag body 20 containing dialysis medicine solution. The second transfer tube 4 is fixedly communicated with the liquid outlet connector 11 and the first bag body 6. The material of the transfer tube includes a matrix material and an elastic material; the weight percentage of the matrix material and the elastic material is more than 50%; the matrix material is PP or PE.

[0060] As Figure 1 、 Figure 2 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. The end of the liquid storage bag connected to the drainage bag connector 5 is the 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 peritoneal dialysis three-way connector 10. Preferably, the material of the drainage bag connector 5 is the same as the material of the peritoneal dialysis three-way connector 10. Specifically, the material of the drainage bag connector 5 includes a matrix material and an elastic material. Among them, the matrix material and the elastic material are the main component materials of the drainage bag connector 5, and the weight percentage of the matrix material and the elastic material is more than 50%; the matrix material is PP or PE. The elastic material is one or more of SEBS, EVA, POE, SBS, EPR, TPEE, EPDM, and SIS.

[0061] In this embodiment, the drainage bag joint 5 is connected to the center position of the bag connection end 61. The first bag body 6 has a bag connection end 61 that is welded and fixed to the first connection end 501. The drainage bag joint 5 is fixedly connected to the second transmission tube 4. The tube end of the second transmission tube 4 is non-stickingly sleeved outside the drainage bag joint 5. The non-stickingly fitting fixed connection method can be to mechanically cold-push the tube end into the outside of the joint without manual pushing and applying glue, improving the manufacturing efficiency.

[0062] After verification, the existing method of manually applying glue and pushing for manufacturing has an approximate efficiency of about 2,500 pieces per 8 hours per single worker. However, with the mechanical automatic cold-insert manufacturing method of this embodiment, more than 9,000 pieces can be manufactured per 8 hours per single worker, and the connection efficiency between the joint and the transmission conduit is increased to more than 3 times, significantly improving the manufacturing efficiency.

[0063] As Figures 3 to 6 shown, the drainage bag joint 5 extends along its length direction H; the drainage bag joint 5 has a second connection end 502 for connecting the second transmission tube 4 and a first connection end 501 for connecting the first bag body 6. The main materials of the drainage bag joint 5 and the second transmission tube 4 in this embodiment are the same, facilitating the formation of a fitting and sealing structure due to the similar materials after the two are in a connected state, 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 sleeved inside the second transmission tube 4.

[0064] As Figure 3 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 the vertical step 54. As Figure 9 、 Figure 10 shown, relying on the structures of the vertical step 54, the reduced-diameter portion 56, and the expanded portion 55, the tube end 41 of the second transmission tube 4 is non-stickingly hooked outside the second connection end 502 of the drainage bag joint 5. Among them, the outer diameter of the reduced-diameter portion 56 is greater than the inner diameter of the second transmission tube 4. Furthermore, when the tube end 41 of the second transmission tube 4 retracts at the first sleeve portion 412 corresponding to the reduced-diameter portion 56, it is still in a state of being expanded by the reduced-diameter portion 56 and is closely attached to the outer wall of the reduced-diameter portion 56 (non-stickingly fitting), improving the connection strength and ensuring the sealing performance.

[0065] Specifically, the width of the vertical step 54 is between 1 and 20 mm. Through the vertical step 54, a hooking structure can be formed for the tube end 41 of the second transmission tube 4. When the second transmission tube 4 passes through the vertical step 54, it contracts and changes diameter under its own elastic recovery, and then the vertical step 54 hooks the second transmission tube 4 to form a stop for the second transmission tube 4, asFigure 9 , Figure 10 As shown, on the basis of their close connection, the stability of the connection is ensured by forming a physical hooking structure.

[0066] 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, and the diameter at the port of the end chamfer 551 is smaller than the inner diameter of the second transfer tube 4. In this way, when squeezing and pushing, relying on the end chamfer 551, it is convenient for the end of the drainage bag connector 5 to be inserted into the tube end 41 of the second transfer tube 4, and gradually pushed in to expand the tube end 41 of the second transfer tube 4. Of course, the outermost (the lowest when facing Figure 3 ) expansion part 55 is preferably a conical structure to facilitate squeezing in and expanding the tube end 41 of the second transfer tube 4.

[0067] The connection length between the tube end 41 of the second transfer tube 4 and the second connection end 502 is greater than the length of the expansion part 55. Specifically, the connection length between the tube end 41 of the second transfer tube 4 and the second connection end 502 is 5 mm to 30 mm. When the second transfer tube 4 is connected to the drainage bag connector 5, the expansion part 55 is sleeved inside the tube end 41 of the second transfer tube 4. The tube end 41 of the second transfer tube 4 and the first connection end 501 are connected by cold insertion.

[0068] As Figure 9 shown, the tube end 41 of the second transfer tube 4 mainly includes a first sleeve part 412 sleeved outside the reduced-diameter part 56 and a second sleeve part 411 sleeved outside the expansion part 55. Among them, the inner diameter of the first sleeve part 412 is greater than the inner diameter of the second transfer tube 4 (non-tube-end part), that is, the first sleeve part 412 is still in the state of being expanded by the reduced-diameter part 56 to ensure their close sealing. The second sleeve part 411 is sleeved outside the expansion part 55 and closely adheres to the outer wall of the expansion part 55.

[0069] To form an effective physical hooking structure, the length of the reduced-diameter part 56 is more than one-third of the inner diameter of the second transfer tube 4, that is, L≥D / 3, where L is the length of the reduced-diameter part 56 and D is the inner diameter of the second transfer tube 4 (in the natural state without being sleeved). For example, when the inner diameter of the second transfer tube 4 is 6 m, the length of the reduced-diameter part 56 is more than 2 mm.

[0070] The expansion part 55 is a cylindrical or conical structure. As Figure 10 shown, the drainage bag connector 5 may have a plurality of vertical steps 54 to form a multi-stage 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 reduced-diameter part 56 is provided with 1, 2, or 3. At Figure 10In the illustrated embodiment, there are two each of the facade steps 54 (54a, 54b), the expansion parts 55 (55a, 55b), and the reduced-diameter parts 56 (56a, 56b). The second transfer pipe 4 is sleeved on the facade steps 54 (54a, 54b), the expansion parts 55 (55a, 55b), and the reduced-diameter parts 56 (56a, 56b) to form a secondary hooking structure.

[0071] In the existing connection process lacking the wing structure 52, when the two bag mouth film layers 611 are butted on both sides of the joint of the single pipe body, seam gaps are likely to occur, especially at the butting position of the bag mouth film layers 611, resulting in a relatively high defect rate. This requires the welding position of the joint of the single pipe body structure to be very precise to avoid the generation of seam gaps and ensure that the two bag mouth film layers 611 and the single pipe body form a complete circular sealing structure.

[0072] As Figure 1 , Figure 3 , Figure 7 , Figure 8 As shown, the drainage bag joint 5 includes a main body pipe 51 and a wing structure 52 provided on the side wall of the main body pipe 51. The wing structure 52 is integrally provided on the main body pipe 51 and is injection-molded integrally with the main body pipe 51. The bag connection end 61 has relatively connected bag mouth film layers 611. The main body pipe 51 and the wing structure 52 are fixedly clamped between the two bag mouth film layers 611a, 611b. The wing structure 52 lies flat between the two bag mouth film layers 611a, 611b. The wing structure 52 extends along a radial direction. The wing structure lies flat between the two bag mouth film layers 611 so that the two bag mouth film layers 611 are distributed on both sides of the wing structure 52 in a mirror-symmetrical manner, thereby ensuring the welding and sealing quality.

[0073] Among them, for forming better connection quality, the connecting thin plate 521 has two opposite welding planes 527. When the wing structure 52 lies flat between the two bag mouth film layers 611a, 611b, the bag mouth film layer 611 can be directly attached to the welding plane 527, and the two are melted under welding to form a connection weld. The connecting thin plate 521 provides the welding plane 527 instead of an uneven welding surface, so as to adapt to the thin plate characteristics of the connecting thin plate 521 itself. During the welding process, it can be integrally fused with the bag mouth film layer 611 directly through attachment, and is easy to manufacture. The welding plane 527 can be an inclined plane as shown in Figure 5 , or a vertical plane as shown in Figure 5 .

[0074] Among them, the bag connection end 61 and the first connection end 501 of the drainage bag connector 5 can be welded by power frequency pulse welding (also known as: power frequency heating welding). With the presence of the wing structure 52, after placing the drainage bag connector 5 between the two bag mouth film layers 611, a single welding can achieve the sealing of the first bag body 6 and the fixed connection between the first bag body 6 and the drainage bag connector 5. A sealing strip 65 for sealing the bag connection end 61 is formed through welding.

[0075] As Figure 7 , Figure 8 shown, during welding, part of the wing structure 52 melts and combines with the film layer to form an integral body. Thus, the wing structure 52 has a fusion part 525 that fuses with the bag mouth film layer 611. The wing structure 52 ( Figure 8 the connecting thin sheet 5211 therein) in the state of connecting the first bag body 6 has a reduced area or radial length compared to the wing structure 52 ( Figure 8 the connecting thin sheet 5212 therein) in the state of not being connected to the first bag body 6. During the welding process, the wing structure 52 will lose part of its area, and the lost area part of the wing structure 52 fuses with the bag mouth film layer 611 to form an integral structure. This not only overall increases the connection area between the first bag body 6 and the drainage bag connector 5 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 preventing the problem of detachment. Among them, it can be seen from the Figure 8 schematic that the connecting thin sheet 5211 remaining after welding has a reduced area or radial length compared to the connecting thin sheet 5212 in the unconnected state.

[0076] By providing the wing structure 52 on the drainage bag connector 5 of this embodiment, the two bag mouth film layers 611a, 611b cover the main body tube 51 and span the main body tube 51, covering the wing structure 52 on both sides of the main body tube 51. Even if there is a butt joint gap between the two bag mouth film layers 611a, 611b, the corresponding butt joint gap can be filled due to the presence of the wing structure 52. Of course, more importantly, due to the presence of the wing structure 52, the two bag mouth film layers 611 do not need to be closely butted on one side of the main body tube 51. As long as they are kept close to the surface of the wing structure 52, welding can be performed. In this way, the requirements for the butt joint position of the entire drainage bag connector 5 are lower, and a higher yield can be obtained. Correspondingly, the welding and sealing quality is higher.

[0077] In this embodiment, the wing structure 52 includes connecting thin sheets 521 (521a, 521b) distributed on both sides of the main body tube 51, and the connecting thin sheets 521 are in a thin sheet structure. In the non-assembled state, the connecting thin sheets 521a and 521b are symmetrically distributed on both sides of the main body tube 51. The thickness of the connecting thin sheet 521 is 0.01 - 1.5 mm, and the length in the radial direction is 1 - 10 mm. The length L1 of the connecting thin sheet 521 along the length direction H of the main body tube is 1 - 10 mm. Preferably, the length L1 is 3 - 8 mm. Among them, the number of the connecting thin sheets 521 can be more than two and they are symmetrically distributed. The main body tube 51 is provided with two or more of the wing structures 52 along its length direction H. Preferably, the shapes of the connecting thin sheets 521 of the two wing structures 52 are the same. The connecting thin sheet 521 has an inner end connecting the main body tube 51 and an outer end far from the main body tube 51. To fill the docking gap of the bag mouth film layer 611, the thickness of the connecting thin sheet 521 gradually decreases from the inner end to the outer end.

[0078] There are various shapes of the connecting thin sheet 521. In this embodiment, the shape of the connecting thin sheet (longitudinal section, Figure 3 section view in the shown view) is rectangular. In other embodiments such as Figure 6 a, b, c, d, the outer edge of the connecting thin sheet 521 can be serrated. At this time, the outer end of the connecting thin sheet 521 is provided with protrusions and recesses arranged in a staggered manner along the length direction H of the main body tube. The protrusions and recesses can be arranged at equal intervals in a staggered manner or irregularly arranged, and each protrusion and recess can be the same or different. Of course, preferably, the protrusions and recesses have the same shape. Similarly, the cross-sectional shapes of the connecting thin sheets 521 of different wing structures 52 can also be different. As shown in Figure 5 the cross-section of the connecting thin sheet 521 is in the shape of a triangular spike, rectangle, irregular shape, etc., and the present application does not make any restrictions.

[0079] Considering that if the smooth main body tube is directly welded to the bag connection end 61, during the welding process, the outer wall surface of part of the main body tube melts and fuses with the bag mouth film layer 611 of the bag connection end 61, and the melted part of the main body tube material is likely to overflow to form unwanted raised foreign objects, which affects the welding quality inside the bag mouth film layer 611 and causes poor sealing.

[0080] Such as Figure 3As shown, to ensure the connection quality between the first connection end 501 and the bag connection end 61, the first connection end 501 further has a connection convex ring 58 on the outer wall of the main body tube 5151, and the connection convex ring 58 protrudes from the outer wall surface of the main body tube 51. The width W2 of the connection convex ring 58 along the length direction H of the main body tube is between 0.5 mm and 2 mm. The height of the connection convex ring 58 protruding from the outer wall surface of the main body tube 51 is between 0.05 mm and 1 mm. The connection convex ring 58 is distributed between the connection thin plates 521 on both sides of the main body tube 51, and one end of the connection convex ring 58 continuously extends from one connection thin plate 521a to the other connection thin plate 521b. Taking the connection thin plate 521 as the symmetry interface, the connection convex ring 58 is symmetrically distributed on both sides of the connection thin plate 521.

[0081] 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 being L1. Two or more connection convex rings 58 are arranged and distributed along the length direction H in the connection area, and the interval between adjacent two connection convex rings 58 is 0.5 mm to 2 mm. A filling groove is formed between adjacent two connection convex rings 58. Among the multiple connection convex rings 58, one connection convex ring 58 is aligned with one side edge of the connection thin plate 521, and the other connection convex ring 58 is aligned with the other side edge of the connection thin plate 521. In an embodiment where there are multiple wing structures 52 on the main body tube 51, as Figure 3 shown, there are two wing structures 52 (two pairs of connection thin plates 521) on the main body tube 51, and correspondingly, there are two connection areas on the main body tube 51 where connection convex rings 58 are correspondingly arranged.

[0082] By providing spaced-apart connection convex rings 58 and forming filling grooves between the connection convex rings 58, during the welding process, the connection convex rings 58 are melted first and overflow to the side and flow into the filling grooves. In this way, it is difficult to form raised foreign matters in the connection area that affect the welding quality. The height of the connection convex rings 58 gradually decreases under high-temperature welding and gradually becomes flush with the overflowed 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 kind of connection structure can reduce the requirements for the welding accuracy of the drainage bag joint 5 and the welding head, and provide a connection structure with better quality, reducing the processing and manufacturing process difficulty.

[0083] As Figure 2 、 Figure 3 shown, the bag connection end 61 has at least one weld seam strip 570 for welding the bag mouth film layer 611 relatively; the number of the wing structures 52 is equal to the number of the weld seam strips 570, and they are aligned one by one in the width direction of the first bag body 6. The weld seam strip 570 extends from the first bag body 6 in the width (when facing Figure 1extends continuously from one side to the other side in the left-right direction (when in use), and spans across the drainage bag connector 5. The bag connection end 61 is integrally formed by welding with the drainage bag connector 5 to form the weld strip 570. The width W1 of the weld strip 570 in the length direction H of the main body tube 51 is equal to the length L1 of the connecting thin sheet 521. Of course, both are also equal to the length of the connecting area in the length direction H.

[0084] On the disposable drainage bag, after welding, the connecting convex ring 58 and the filling groove 585 are substantially flush, forming a welding surface that is substantially flat with the bag mouth film. Furthermore, the weld strip 570 on the main body tube 51 is a continuous weld in the length direction H and will not form an intermittent weld due to the intermittently arranged connecting convex rings 58, forming a connection structure with excellent sealing performance on the small-sized drainage bag connector 5. Similarly, the weld strip 570 on the connecting thin sheet is also a continuous weld in the length direction H.

[0085] The structure of the Luer three-way connector currently used in peritoneal dialysis is due to the need for multiple threaded connections with the external peritoneal dialysis tube. To avoid wear on the connector or severe wear, it is composed of PVC and TPEE respectively to form two parts of the Luer three-way connector. On the one hand, the connector made of TPEE material is used for multiple connections with the external peritoneal dialysis tube to reduce wear and leakage and improve the service life of the external peritoneal dialysis tube. On the other hand, the connector made of PVC material is used for reliable connection with the transmission catheter. Moreover, the materials and manufacturing processes (such as power frequency welding and bonding) of such a split-structured Luer three-way connector are relatively mature, which also forms a certain degree of obstruction to the formation of improved processes.

[0086] As Figures 11 to 17 shown, compared with the above traditional design, in this embodiment, the peritoneal dialysis three-way connector 10 is an integral 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 integrally injection-molded structure. Therefore, there is no need to separately manufacture the parts and then assemble them, simplifying the assembly process, improving the manufacturing efficiency, and the peritoneal dialysis three-way connector 10 has no split connection parts, and its own structural strength is higher.

[0087] In the prior art, it takes about 1 piece per 7 seconds to manufacture and assemble a single peritoneal dialysis three-way connector by inserting a split-structured PVC three-way into the dialysis Luer connector and then performing high-frequency welding. However, the injection molding time of the peritoneal dialysis three-way connector 10 with the structure of this embodiment is 4 pieces per 15 seconds. It can be seen that this embodiment can greatly improve the manufacturing efficiency, thereby saving manufacturing costs, reducing the manual assembly process, and improving the process manufacturing level.

[0088] In this embodiment, the material of the dialysis Luer connector 15 is the same as that of the liquid inlet connector 12 and the liquid outlet connector 11, and they are all non-PVC materials. Specifically, the material of the dialysis Luer connector 15 includes a matrix material and an elastic material; the weight percentages of the matrix material and the elastic material are above 50%; the matrix material is PP or PE.

[0089] The material of the peritoneal dialysis three-way connector 10 in this embodiment includes a matrix material and an elastic material; the weight percentages of the matrix material and the elastic material are above 50%; the matrix material is PP or PE or TPEE. Further, the weight percentages of the matrix 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. Thus, the main materials of the peritoneal dialysis three-way connector 10 and the transmission tube in this embodiment are both the matrix material and the elastic material. After they are fitted together, due to the similar materials, they can form a fitted sealing structure, which is not only convenient for connecting them but also can avoid connection leakage.

[0090] Compared with the traditional PVC material, the peritoneal dialysis three-way connector 10 or the transmission catheter material in this application is more environmentally friendly. The PVC material pipe will produce toxic substances when burned, so currently it can only be degraded by landfill. However, the peritoneal dialysis three-way connector 10 or the transmission catheter material in the embodiment of this application can be burned, and it is not easy to produce harmful substances during the burning process.

[0091] In the peritoneal dialysis three-way connector 10, at least the dialysis Luer connector 15 is made of a transparent or semi-transparent material. Considering that the material of the entire peritoneal dialysis three-way connector 10 is consistent, it is made of a transparent or semi-transparent material (similar to the effect of frosted glass). Thus, during the peritoneal dialysis process, the flow of the liquid can be observed through the peritoneal dialysis three-way connector 10, which is convenient for the operation of the corresponding external peritoneal dialysis tube, reduces the probability of operation errors, and improves the user experience.

[0092] In this embodiment, the peritoneal dialysis three-way connector 10 is an integral structure, which includes a main pipe section 13 extending along the longitudinal direction (length direction F1). The main pipe section 13 is the main part of the peritoneal dialysis three-way connector 10. The dialysis Luer connector 15, the liquid inlet connector 12, and the liquid outlet connector 11 are arranged on the main pipe section 13 to form the peritoneal dialysis three-way connector 10 with a three-way structure. The main pipe section 13 and the dialysis Luer connector 15, the liquid inlet connector 12, and the liquid outlet connector 11 are injection-molded into an integral structure.

[0093] Such as Figure 11 、 Figure 12 、 Figure 13 、 Figure 14As shown in the figure, the dialysis luer connector 15 is arranged at one end of the main pipe section 13 in its length direction F1; the liquid inlet connector 12 and the liquid outlet connector 11 are arranged at the other end of the main pipe section 13. One end of the main pipe section 13 is provided with an end flange plate 16, 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 wing plates 14. The wing plates 14 are distributed on both sides of the main pipe section 13, which is convenient for users to apply force and rotate relative to the peritoneal dialysis external connecting tube for assembly. The included angle between the liquid inlet connector 12 and the liquid outlet connector 11 is an acute angle or a right angle. Preferably, the included angle between the liquid inlet connector 12 and the liquid outlet connector 11 is set as an acute angle.

[0094] In this embodiment, the liquid outlet connector 11 is coaxially arranged with the main pipe section 13, located on the extension line of the main pipe section 13, and can form a 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 both ends of the main pipe section 13, forming a coaxial straight pipe structure.

[0095] As Figures 11 to 14 shown in the figure, the dialysis luer connector 15 includes an outer tube sleeve 150 and an inner connector 17 coaxially located inside the outer tube sleeve 150. The outer tube sleeve 150 and the inner connector 17 are also injection-molded integrally formed structures and form a luer connector structure. Among them, the dialysis luer connector 15 is a female luer connector and is matched and connected with the male luer connector of the peritoneal dialysis external connecting tube.

[0096] Specifically, the outer diameter of the outer tube sleeve 150 is larger than the outer diameter of the main pipe section 13, including a smooth wall section 151 and a connecting section 152 located on the side of the smooth wall section 151 close to the main pipe section 13. The inner wall of the smooth wall section 151 is a smooth wall surface, which is convenient for the male luer connector of the peritoneal dialysis external connecting tube to be inserted. Moreover, the connecting section 152 is located inside the smooth wall section 151, and the inner wall of the connecting section 152 is provided with threads, which cooperate with the inner connector 17 to form a luer structure, and then are threadedly connected with the male luer connector of the peritoneal dialysis external connecting tube.

[0097] To facilitate connection with the peritoneal dialysis external connecting tube and avoid wear and damage to the peritoneal dialysis external connecting tube caused by multiple connections, the material of the outer tube sleeve 150 mainly includes a matrix material and an elastic material. It is integrally flexible and has a certain elastic modulus. To adapt to the connection of the peritoneal dialysis external connecting tube, the wall thickness of the outer tube sleeve 150 is 0.1 - 3 mm, and the hardness of the outer tube sleeve 150 is 30 - 60 Shore D. The outer tube sleeve 150 with such hardness and wall thickness can reduce the wear on the peritoneal dialysis external connecting tube when connecting with the peritoneal dialysis external connecting tube and ensure the service life of the peritoneal dialysis external connecting tube.

[0098] Optionally, to improve the sealing performance and avoid leakage, a sealing step 155 is further provided inside the outer pipe sleeve 150. The sealing step 155 is located on the inner wall of the light wall section 151. In this way, a stepped hole structure is formed on the inner wall of the outer pipe sleeve 150, and it is butt-jointed with the corresponding structure of the male Luer connector of the peritoneal dialysis external connecting pipe through the sealing step 155 to form a fitting seal. Of course, an end step is also formed at the end of the connecting section 152, and the sealing step 155 is on the outer side of the end step (the side away from the liquid outlet joint 11). The inner diameter of the connecting section 152 is reduced to a certain extent relative to the light wall section 151, and then an internal thread is provided on the connecting section 152 to avoid reducing the connection wall thickness and ensure the connection strength.

[0099] In this embodiment, the tube end of the first transfer tube 3 is non-stickingly fitted over the liquid inlet joint 12. The tube end of the second transfer tube 4 is non-stickingly fitted over the liquid outlet joint 11. The tube end of the transfer tube itself is butt-jointed and extruded by cold pushing (in a non-heated state, for example: at room temperature), so that its tube end expands, and then the liquid inlet joint 12 and the liquid outlet joint 11 are respectively inserted into the corresponding first transfer tube 3 and second transfer tube 4. The tube ends of the first transfer tube 3 and the second transfer tube 4 rely on their own elastic retraction performance to closely adhere to the outer walls of the internally sleeved liquid inlet joint 12 and liquid outlet joint 11 to form a seal.

[0100] The first transfer tube 3 and the second transfer tube 4 of this embodiment are connected to the liquid inlet joint 12 and the liquid outlet joint 11, and there is no need to heat them to make them soft and then perform butt-jointed insertion. Therefore, the first transfer tube 3 and the second transfer tube 4 of this embodiment are non-stickingly fitted with the liquid inlet joint 12 and the liquid outlet joint 11. After heating, the tube end and the joint will form a certain adhesion, but the tube end connection structure of this embodiment does not generate such adhesion. It relies on elastic retraction to closely adhere to the outer walls of the internally sleeved liquid inlet joint 12 and liquid outlet joint 11 to form a seal. When the longitudinal section of the tube end joint connection structure is cut open, there is no adhesive layer between the two, and it is in a physically close state. The non-stickingly fitted fixed connection method can use mechanical cold pushing of the tube end over the joint, without manual pushing, thereby improving the manufacturing efficiency.

[0101] Among them, the tube ends of the first transfer tube 3 and the second transfer tube 4 are sleeved on the liquid inlet joint 12 and the liquid outlet joint 11 by means of deformation; the deformation mainly includes elastic deformation. Of course, there may also be a certain degree of plastic deformation at the tube ends of the first transfer tube 3 and the second transfer tube 4, and this application does not limit this. After the first transfer tube 3 or the second transfer tube 4 is pulled out and separated from the liquid inlet joint 12 or the liquid outlet joint 11, the tube ends of the first transfer tube 3 or the second transfer tube 4 can recover their shape to a certain extent.

[0102] Such as Figures 14 to 17As shown in the figure, to improve the connection strength between the first transfer pipe 3, the second transfer pipe 4 and the corresponding liquid inlet joint 12 and liquid outlet joint 11, at least one of the liquid inlet joint 12 and the liquid outlet joint 11 is provided with at least one connection step 113 facing the main pipe section 13. The connection step 113 is fixedly sleeved inside the transfer pipe. The width of the connection step 113 is between 1 and 20 mm.

[0103] Through the connection step 113, a hooking structure can be formed for the pipe end of the transfer pipe. When the transfer pipe passes through the connection step 113, it shrinks and reduces its diameter under the condition of its own elastic recovery. Then, the connection step 113 hooks the transfer pipe to form a stop for the transfer pipe, as Figure 15 shown. On the basis of their close connection, a physical hooking structure is formed to ensure the stability of the connection. The outer edges of the ends of the liquid inlet joint 12 and the liquid outlet joint 11 have chamfered ends 119 to reduce the outer diameter of the ends to be smaller than the inner diameter of the transfer pipe (the first transfer pipe 3, the second transfer pipe 4). The diameter at the port of the chamfered end 119 is smaller than the inner diameter of the transfer pipe (the first transfer pipe 3, the second transfer pipe 4). In this way, when squeezing and pushing in, it is convenient for the ends of the liquid inlet joint 12 and the liquid outlet joint 11 to be inserted into the pipe end of the transfer pipe, and gradually pushed in to expand the pipe end of the transfer pipe. Of course, the outermost (the lowest when facing Figure 4 downward) expansion section 111 can be a conical structure to facilitate squeezing in and expanding the pipe end of the transfer pipe.

[0104] Specifically, at least one of the liquid inlet joint 12 and the liquid outlet joint 11 is provided with a reduced-diameter section 112 and an expansion section 111. The annular interface between the reduced-diameter section 112 and the expansion section 111 forms the connection step 113. The reduced-diameter section 112 is located on the side of the expansion 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 any one of the first transfer pipe 3 and the second transfer pipe 4. Furthermore, when the pipe end of the transfer pipe retracts at the first part 36 corresponding to the reduced-diameter section 112, it is still in a state of being expanded by the reduced-diameter section 112 and is in close contact (non-adhesive contact) with the outer wall of the reduced-diameter section 112, improving the connection strength and ensuring the sealing performance.

[0105] As Figure 15 shown, the pipe end of the transfer pipe mainly includes a first part 36 sleeved outside the reduced-diameter section 112 and a second part 35 sleeved on the expansion section 111. Among them, the inner diameter of the first part 36 is larger than the inner diameter of the transfer pipe (non-pipe-end part). That is to say, the first part 36 is still in a state of being enlarged and expanded by the reduced-diameter section 112 to ensure close contact and sealing between the two. The second part 35 is sleeved outside the expansion section and is in close contact with the outer wall of the expansion section.

[0106] To form an effective physical hooking structure, the length of the reduced-diameter section 112 is greater than or equal to one-third of the inner diameter of the first transfer tube 3 or the second transfer tube 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 transfer tube 3 or the second transfer tube 4. For example, when the inner diameter of the first transfer tube 3 is 6m, the length of the reduced-diameter section 112 is 2mm or more.

[0107] The expansion section 111 is a cylindrical or conical structure. As Figure 16 , Figure 17 shown, the liquid inlet connector 12 and the liquid outlet connector 11 can each have a plurality of connecting steps 113 to form a multi-stage physical hooking structure instead of a chemical connection method, ensuring the connection strength between the first transfer tube 3, the second transfer tube 4 and the corresponding liquid inlet connector 12, liquid outlet connector 11. Correspondingly, the expansion sections 111 (111a, 111b), the contraction sections 112 (112a, 112b), and the connecting steps 113 (113a, 113b) can each be provided with a plurality of. Preferably, the expansion section 111 is provided with 1, 2, or 3, and the contraction section 112 is provided with 1, 2, or 3.

[0108] Of course, the structure of the second connection end 502 in the above embodiment and the structure of the liquid inlet connector 12 or the liquid outlet connector 11 can be mutually referred to and combined; the connection method between the drainage bag connector 5 and the second transfer tube 4 is also the same as the connection method between the liquid inlet connector 12 or the liquid outlet connector 11 and the first transfer tube 3 or the second transfer 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 mutually referred to and combined, and no other elaboration will be made in this application.

[0109] As Figures 1 to 20 shown, an embodiment of the present application also provides a drainage bag connector 5. The drainage bag connector 5 is an injection-molded integral structure, which has a first connection end 501 and a second connection end 502 along its length direction; the second connection end 502 is used for fixedly connecting the transfer catheter 30. The first connection end 501 is used for fixedly connecting the liquid storage bag 6.

[0110] The first connection end 501 includes a longitudinally extending body tube 51 and wing structures 52 integrally provided on the outer side wall of the body tube 51; the wing structures 52 include connection thin plates 521 symmetrically arranged on both sides of the body tube 51, and the connection thin plates 521 have two welding planes 527 facing away from each other. The longitudinally extending direction is the length direction of the drainage bag connector 5.

[0111] This drainage bag connector 5 can be used to manufacture a disposable drainage bag. The disposable drainage bag is used to drain fluids such as urine, wound drainage fluid, blood infiltration, or effusion. Its liquid storage bag 6 can also be called a waste liquid bag, which is in an empty and flat state before use and is used to store the drainage fluid in the liquid storage bag 6 during use.

[0112] The present application also provides a disposable drainage bag as shown in Figure 18 , Figure 19 , comprising: a liquid storage bag 6, a drainage bag connector 5; and a transmission catheter 30. Among them, the liquid storage bag 6 is used to collect the drained liquid. The first connection end 501 of the drainage bag connector 5 is fixedly connected to the liquid storage bag 6; one end of the transmission catheter 30 is connected with a connection joint 10, and the other end is fixedly sleeved outside the second connection end 502 of the drainage bag connector 5.

[0113] The connection joint 10 includes a Luer connector, such as the female Luer connector shown in Figure 1 or the male Luer connector shown in Figure 2 . As shown in Figure 1 , the connection joint is also detachably covered with a protective cap 8. The protective cap 8 is detachably covered on the dialysis Luer connector 15. The protective cap 8 is a flexible protective cap 8 made of non-PVC material, and it is covered on the dialysis Luer connector 15 to prevent the connection joint from being contaminated. The protective cap 8 has a pull ring, and by means of the pull ring, the user can pull the protective cap 8 off the connection joint. The connection joint can be used to connect a drainage tube.

[0114] In this embodiment, the transmission catheter 30 is made of non-PVC material, and a liquid stop clamp 40 can also be provided thereon. Specifically, the material of the transmission catheter 30 includes a matrix material and an elastic material; the weight percentages of the matrix material and the elastic material are above 50%; the matrix material is PP or PE.

[0115] As shown in Figure 1 , Figure 2 , 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. One end of the liquid storage bag 6 connected to the drainage bag connector 5 is the 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 includes a matrix material and an elastic material. Among them, the matrix material and the elastic material are the main component materials of the drainage bag connector 5, and the weight percentages of the matrix material and the elastic material are above 50%; the matrix material is PP or PE. The elastic material is one or more of SEBS, EVA, POE, SBS, EPR, TPEE, EPDM, and SIS.

[0116] As shown in Figures 21 to 27, in an embodiment of the present application, a drainage bag connector 5 is further provided. The drainage bag connector 5 is an injection-molded integral structure, and has a first connection end 501 and a second connection end 502 along its length direction. The second connection end 502 is used for fixedly connecting a transmission conduit 30 (such as the above-mentioned first transmission pipe 3 or second transmission pipe 4). The first connection end 501 is used for fixedly connecting a liquid storage bag 6. This drainage bag connector 5 can form a disposable drainage bag with the transmission conduit 30 and the connection joint 10 as shown in Figure 21 . The connection method between the drainage bag connector 5 and the bag connection end 61 can refer to the description in the above embodiment and will not be elaborated here. Of course, the disposable drainage bag can refer to the content described in the above embodiment, and the repeated parts will not be elaborated either.

[0117] The drainage bag connector 5 includes a longitudinally extending body tube 51 and wing structures 52 integrally provided on the outer side wall of the body tube 51. The wing structures 52 include connecting thin plates 521 symmetrically arranged on both sides of the body tube 51, and the connecting thin plates 521 have two welding planes facing each other; the body tube 51 is a straight tube, and the outer diameter of the body tube 51 remains unchanged from the first connection end 501 to the second connection end 502.

[0118] The material of the body tube 51 is similar to or the same as that of the transmission conduit 30. The inner diameter of the body tube 51 is larger than the inner diameter of the transmission conduit 30. The outer diameter of the body tube 51 is larger than the outer diameter of the transmission conduit 30.

[0119] In this embodiment, the connecting thin plates 521 are symmetrically arranged on the outer wall of the straight tube structure of the body tube 51, and the length of the connecting thin plates 521 is greater than Figure 2 , Figure 3 the connecting thin plates 521 of the shown drainage bag connector. As shown in Figure 21 , Figure 22 , the connecting thin plates 521 continuously extend from at least one weld strip to another weld strip. Further, the connecting thin plates 521 continuously span all weld strips. For the convenience of manufacturing and improving the manufacturing efficiency, the connecting thin plates 521 extend from one end of the body tube 51 to the other end of the body tube 51, and the length of the connecting thin plates 521 is equal to the length of the drainage bag connector 5 (or the body tube 51). Of course, as shown in Figure 30 , the connecting thin plates 521 have a longer length, and only need to span multiple weld strips, and do not need to have the same length as the body tube 51. For example, the length of the connecting thin plates 521 is more than 0.5 times the length of the body tube 51.

[0120] Specifically, the length of the connecting thin sheet 521 (the length in the length direction of the main body tube 51) is 0.02 mm or more, and the length can be between 0.02 mm and 20 mm. Preferably, the length is between 5 mm and 15 mm. The thickness of the connecting thin sheet 521 is 0.05 - 2 mm.

[0121] Of course, the thickness and radial length (width) of the connecting thin sheet 521 can refer to the description in the above embodiments, and will not be elaborated here.

[0122] One end of the transmission catheter 30 is connected with a connecting joint 10, and the other end is fixedly sleeved inside the second connecting end 502 of the drainage bag joint 5. One end of the transmission catheter 30 is fixedly bonded inside the main body tube 51 of the drainage bag joint 5. The materials of the drainage bag joint 5 and the transmission catheter 30 are similar or the same. Therefore, after the two are sleeved, bonding can be directly formed, and the bonding quality is firm. 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, bonding and fixing are formed without glue or adhesive. Of course, after one end of the transmission catheter 30 is inserted into the second connecting end 502, secondary heating can be performed so that both of them are in a non-molten expanded and softened state and then naturally cooled.

[0123] In a preferred connection method, one end of the transmission catheter 30 and the second connecting end 502 can be directly cold-inserted. The outer diameter of the insertion end of the transmission catheter 30 is larger than the inner diameter of the second connecting end 502, and the inner diameter of the second connecting end 502 is smaller than the outer diameter of the insertion end of the transmission catheter 30. The inner diameter of the second connecting end 502 is 1% - 50% smaller than the outer diameter of the insertion end of the transmission catheter 30. After the second connecting end 502 is flared and one end (the insertion end) of the transmission catheter 30 is inserted, the second connecting end 502 shrinks and fits with the transmission catheter 30 after the second connecting end 502 is released. The materials of the two are similar or the same, and thus a firm connection relationship is formed when they fit. By means of the cold-insertion method, the insertion end of the transmission catheter 30 non-stickily fits and is sleeved inside the second connecting end 502.

[0124] When the method of cold insertion connection between the transfer conduit 30 and the second connection end 502 is applied to the above-mentioned drainage bag joint 5 and the second transfer tube 4, it can be understood that: at this time, the second connection end 502 is fixedly connected to the second transfer tube 4; the first connection end 501 is fixedly connected to the liquid storage bag; wherein, the second connection end 502 is non-stickingly sleeved outside one end of the second transfer tube 4. To ensure the connection effect, the outer diameter of the second transfer tube 4 is greater than the inner diameter of the second connection end 502. Specifically, the outer diameter of the second transfer tube 4 is greater than the inner diameter of the second connection end 502 by 1% - 50%, that is, the outer diameter of the second transfer tube 4 is 1.01 times to 1.5 times the inner diameter of the second connection end 502. The drainage bag joint 5 is an integrally injection-molded structure, and the material of the drainage bag joint 5 is the same as that of the second transfer tube 4. One end of the second transfer tube 4 is inserted into the second connection end 502 by cold insertion. The length of the second transfer tube 4 inserted into the second connection end 502 is between 2 mm and 30 mm. The length of the second transfer tube 4 inserted into the second connection end 502 is one-third to four times the inner diameter of the second transfer tube 4.

[0125] Through further research, it is found that after the above-mentioned hooking structure of the connection between the joint and the transfer tube undergoes the high-temperature sterilization process, due to the different materials of the joint and the transfer tube (transfer conduit), their expansion properties at high temperature are different and their contraction properties after cooling are different. As a result, the hooking strength of the hooking structure between the joint and the transfer tube is damaged. Another problem is that the fitting seal between the two is damaged, resulting in a decrease in the yield rate after the sterilization process.

[0126] To solve the above problems, refer to Figures 21 to 29 , an embodiment of the present application further provides a connection joint 10. The improved structure of this connection joint 10 can be applied to the drainage bag joint 5, the three-way joint 10, or Figure 29 the Luer joint shown in, of course, any structure with a hooking structure between the joint and the transfer tube can adopt the improved structure of this embodiment.

[0127] In this embodiment, the connection joint 10 has a joint body and a connection ring 80 provided on the joint body. The joint body is provided with a reduced-diameter section 112 (or reduced-diameter part) and an expanded section 111 (or expanded part). The annular interface between the reduced-diameter section 112 and the expanded section 111 forms the connection step 113 (or vertical step). The joint body can be the drainage bag joint 5, the three-way joint 10, or Figure 29 the Luer joint shown in the above embodiment. Correspondingly, the connection ring 80 can be applied to the joints in the above embodiment as an improved structure.

[0128] A connecting ring 80 is fixedly sleeved outside the contraction section 112. A seal is provided between the connecting ring 80 and 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 elastically contractible manner to achieve a seal therebetween. Further, to prevent the connecting ring 80 from shifting during the cold insertion of the joint, a stop structure is fixedly provided outside the contraction section 112. The connecting ring 80 is sleeved on the outer wall of the contraction section 112 between the stop structure and the connecting step 113 in an elastically contractible manner. As Figure 34 shown, the stop structure is relied upon to prevent the problem of poor connection caused by the connecting ring 80 retracting during cold insertion.

[0129] Among them, the stop structure is a convex structure fixedly connected to the outer wall of the contraction section 112, which can be a single bump structure, or a plurality of circumferentially spaced bumps, and can also be a convex ring structure. The stop ring 77 is made of the same material as the joint body, and it can be the structure of the joint body itself. As Figure 31 shown, the stop structure includes a stop ring 77 integrally injection-molded with the joint 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 generally located at the middle position of the reduced-diameter section, thereby reserving enough length for the transmission tube to be sleeved. The structure of the stop ring 77 applied to the joint in the above embodiment is as Figure 31 、 Figure 32 、 Figure 33 shown.

[0130] In addition, in a feasible embodiment, the connecting ring 80 can be directly injection-molded outside the contraction section 112. At this time, the stop structure can be not provided, and the connecting ring 80 is hermetically connected to the outer wall of the contraction section 112.

[0131] The material of the connecting ring 80 is not the same as the material of the joint (main body), that is, the material of the connecting ring 80 is different from the materials of the above-mentioned drainage bag joint 5 and three-way joint 10. The material of the connecting ring 80 is similar to or the same as the material of the transmission tube (transmission catheter 30). The connecting ring 80 is arranged at the outer end of the contraction section 112, close to the connecting 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 the outer diameter of the connecting ring 80 is greater than or equal to the outer diameter of the connecting step 113. Preferably, the outer diameter of the connecting ring 80 is more than 0.1 mm greater than the outer diameter of the connecting step 113 (or expansion section 111). For example, the outer diameter of the connecting ring 80 is 0.1 mm to 2 mm greater than the outer diameter of the connecting step 113 (or expansion section 111), so as to maintain the sealed fit with the transmission catheter 30 and the stability of the hooking structure through the protruding connecting ring 80 after high-temperature sterilization.

[0132] In this embodiment, the elastic modulus of the connecting ring 80 is greater than that of the joint body, so that sufficient expansion can be provided after high-temperature sterilization to fit and seal the inner wall of the transmission conduit 30. The dimensional length of the connecting ring 80 (along the length direction of the joint body, for example Figure 3 in the H direction) is about 0.5-10 mm.

[0133] 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 conduit 30. The material of the connecting ring 80 includes a matrix material and an elastic material. Among them, the matrix material and the elastic material are the main component materials of the drainage bag joint 5, and the weight percentages of the matrix material and the elastic material are above 50%; the matrix 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 joint body. The material of the connecting ring 80 is the same as or similar to that of the transmission conduit 30, and the two can form material fusion after the high-temperature sterilization process, so that the material of the connecting ring 80 and the transmission conduit 30 form a stable adhesive seal.

[0134] The material of the connecting ring 80 can be pure EVA, POE, POP, SEBS, or a material with PP as the main body and an elastic material added. The added elastic material has a certain viscosity at normal temperature or at high temperature (40-150 degrees). Or in a high-temperature environment, the material of the connecting ring 80 and the transmission conduit 30 have mutual adhesion, melting, or a strong intermolecular shape bond energy.

[0135] The connecting ring 80 can be a circular ring, and its cross-section is also circular. The connecting ring 80 can also have various shape styles, such as Figure 26 , Figure 27 As shown, the cross-section of the connecting ring 80 can be triangular (inverted cone), rectangular, trapezoidal, or irregular (shaped circular ring), and the present application does not make any restrictions. The connecting ring 80 can be one or more than two, and the present application also does not make any restrictions.

[0136] It should be noted that the drainage bag joints and disposable drainage bags in each embodiment of the present application can be referred to and cited with each other, and the repeated parts will not be described again.

Claims

1. A disposable drainage bag, characterized in that, Comprising: A first bag body, the first bag body comprising: a liquid storage bag having a bag connection end and a drainage bag connector fixedly connected to the bag connection end; The bag connection end has relatively connected bag mouth film layers; the drainage bag connector has a body tube and a wing structure integrally provided on the outer wall of the body tube; one end of the body tube and the wing structure are welded between the bag mouth film layers, and the wing structure is laid flat between the two bag mouth film layers; the wing structure includes connecting thin sheets symmetrically distributed on both sides of the body tube; the bag connection end has two or more weld strips for relatively welding the bag mouth film layers; the connecting thin sheet continuously extends from at least one weld strip to another weld strip.

2. The disposable drainage bag according to claim 1, wherein, The drainage bag connector is an injection-molded integral structure, which has a first connection end and a second connection end along its length direction; the first connection end is fixedly connected to the liquid storage bag; the second connection end is fixedly connected to the transmission conduit; the body tube is a straight tube, and the outer diameter of the body tube remains unchanged from the first connection end to the second connection end.

3. The disposable drainage bag according to claim 1, wherein, The length of the connecting thin sheet is more than 0.5 times the length of the body tube.

4. The disposable drainage bag according to claim 1, wherein, The connecting thin sheet continuously spans all the weld strips.

5. The disposable drainage bag according to claim 1, wherein The material of the body tube is similar to or the same as that of the transmission conduit; the inner diameter of the body tube is larger than the inner diameter of the transmission conduit; the outer diameter of the body tube is larger than the outer diameter of the transmission conduit.

6. The disposable drainage bag according to claim 1, wherein The connecting thin sheet extends from one end of the body tube to the other end of the body tube, and the length of the connecting thin sheet is equal to the length of the body tube.

7. The disposable drainage bag according to claim 2, wherein, One end of the transmission conduit is fixedly sleeved inside the second connection end of the drainage bag connector; one end of the transmission conduit is cold plug-connected to the second connection end.

8. The disposable drainage bag according to claim 2, wherein, The outer diameter of the insertion end of the transmission conduit is larger than the inner diameter of the second connection end.

9. The disposable drainage bag according to claim 2, wherein, The inner diameter of the second connection end is 1% - 50% smaller than the outer diameter of the insertion end of the transmission conduit.

10. The disposable drainage bag according to claim 2, wherein, The length of the transmission conduit inserted into the second connection end is one-third to four times the inner diameter of the transmission conduit.

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