Peritoneal dialysis three-way connector

Abstract

The utility model discloses a peritoneal dialysis three-way connector. The peritoneal dialysis three-way connector is provided with a connector body and a connecting ring arranged on the connector body. The connector body is provided with a dialysis Luer connector, a liquid inlet connector and a liquid outlet connector; the protective cap is detachably arranged on the dialysis Luer taper in a covering manner; the dialysis Luer taper is used for connecting a peritoneal dialysis external tube; the connector body with the dialysis Luer connector, the liquid inlet connector and the liquid outlet connector is integrally of an injection molding structure. The joint body is provided with a reducing section and an expansion section; a connecting step is formed on an annular interface of the reducing section and the expansion section; the connecting step is fixedly arranged in the butt joint transmission pipe in a sleeving manner; the connecting ring and the outer wall of the contraction section are sealed; the elastic modulus of the connecting ring is larger than that of the connector body. According to the peritoneal dialysis three-way connector, after high-temperature sterilization, the sealing fit between the peritoneal dialysis three-way connector and a transmission catheter and the stability of a hooking connecting structure can be kept through the protruding connecting ring, and disengagement is avoided.

Description

Technical Field

[0001] This application relates to the field of medical supplies, and particularly to a peritoneal dialysis three-way connector. 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 patient's peritoneal cavity 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), patients can manually replace the dialysate by themselves. For example, the dialysate can be replaced 2 to 5 times a day. The Luer three-way connector used in the existing peritoneal dialysis drainage bag in cooperation 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] Moreover, when the connector used in the existing waste liquid bag of 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 connector tube need to face and adhere to each other and wrap the connector tube during the docking process. At this time, if the position accuracy of the connector tube is insufficient or the accuracy of the welding head itself decreases, it is easy to cause a docking gap at the near-connector tube of the two membrane layers during docking, and an effective seal cannot be formed, resulting in the production of unqualified products. As a follow-up, the connector tube of the existing waste liquid bag is adhesively bonded with a PVC catheter during connection, 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 new type of drainage bag connector and its disposable drainage bag, so as to simplify the assembly process and save manufacturing costs.

[0006] Another object of this application is to provide a new type of drainage bag connector and its disposable drainage bag, so as to maintain the stable sealing fit and hooking connection structure with the transmission catheter through the protruding connecting ring after high-temperature sterilization, and avoid disconnection.

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

[0008] A peritoneal dialysis three-way connector, the peritoneal dialysis three-way connector having a connector body and a connecting ring provided on the connector body; the connector body having a dialysis Luer connector, a liquid inlet connector, and a liquid outlet connector; the protective cap being detachably covered on the dialysis Luer connector; the dialysis Luer connector being used for connecting an external peritoneal dialysis tube; the connector body having the dialysis Luer connector, the liquid inlet connector, and the liquid outlet connector being integrally injection-molded as a whole;

[0009] The connector body is provided with a reduced-diameter section and an expanded section; the annular interface between the reduced-diameter section and the expanded section forms a connecting step; the connecting step is fixedly sleeved inside the butted transmission tube; a seal is provided between the connecting ring and the outer wall of the reduced-diameter section; the elastic modulus of the connecting ring is greater than the elastic modulus of the connector body.

[0010] Preferably, a stop structure is also fixedly provided outside the reduced-diameter section; the connecting ring is sleeved outside the reduced-diameter section between the stop structure and the connecting step in an elastically shrinkable manner.

[0011] Preferably, the stop structure includes a stop ring integrally injection-molded with the connector body; the outer diameter of the stop ring is less 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 connector body, and both are non-PVC materials.

[0013] Preferably, the material of the connecting ring is the same as the material of the first transmission tube or the second transmission tube.

[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 connector body.

[0015] Preferably, both the liquid inlet connector and the liquid outlet connector are provided with a reduced-diameter section and an expanded section, and the annular interface between the reduced-diameter section and the expanded section forms a connecting step; the connecting ring is fixedly sleeved outside the reduced-diameter section.

[0016] Preferably, the outer diameter of the connecting ring is greater than or equal to the outer diameter of the connecting step.

[0017] Preferably, the outer diameter of the connecting ring is more than 0.1 mm greater than the outer diameter of the connecting step.

[0018] Preferably, the connecting ring is a circular ring. Beneficial effects

[0019] In the present utility model, the disposable drainage bag having this drainage bag connector can, after high-temperature sterilization, maintain a sealed fit with the transmission catheter and the stability of the hook connection structure through the protruding connecting ring, avoiding disconnection.

[0020] In the present utility model, the presence of the wing structure can fill the docking gap when two bag mouth film layers are docked. Of course, due to the existence of the wing structure, the two bag mouth film layers do not need to be tightly docked on one side of the body tube. They only need to be kept in contact with 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.

[0021] In the present utility model, the peritoneal dialysis three-way joint is an integral structure, not a split structure. Thus, the peritoneal dialysis three-way joint having the dialysis Luer joint, the liquid inlet joint, and the liquid outlet joint is integrally injection-molded. Furthermore, there is no need to separately manufacture the parts and then assemble them, which can improve the manufacturing efficiency. And there is no split connection part on the peritoneal dialysis three-way joint, so its own structural strength is higher.

[0022] The injection molding time of the peritoneal dialysis three-way joint adopting the structure of this embodiment is 4 pieces / 15 seconds. While the original manufacturing process using a PVC material three-way structure inserted into the dialysis Luer joint and then high-frequency welded takes about 1 piece / 7 seconds to assemble a peritoneal dialysis three-way joint. It can be seen that the peritoneal dialysis drainage bag of the present utility model greatly improves the manufacturing efficiency, thereby saving the manufacturing cost, and can reduce the manual assembly process and improve the process manufacturing level. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 is a schematic structural diagram of a disposable peritoneal dialysis set provided by an embodiment of the present utility model;

[0024] Figure 2 is Figure 1 a schematic structural diagram of the first bag body;

[0025] Figure 3 is Figure 2 a schematic structural diagram of the drainage bag joint in

[0026] Figure 4 is Figure 3 the A-A sectional view and partial enlarged view of

[0027] Figure 5 provides Figure 4 six different sectional shape schematic diagrams of the connecting sheet in

[0028] Figure 6 provides 4 different shapes of Figure 2 a schematic structural diagram of the drainage bag joint in

[0029] Figure 7 is Figure 3 a schematic diagram of the connection section between the connecting sheet and the bag mouth film layer in

[0030] Figure 8It is a schematic diagram of the cross-section of the connecting sheet before and after welding with the mouth film layer of the bag;

[0031] Figure 9 It is Figure 1 A schematic diagram of the cross-sectional structure of the drainage bag joint connected to the second transmission tube;

[0032] Figure 10 It is a schematic diagram of the cross-sectional structure of the drainage bag joint connected to the second transmission tube provided by another embodiment of the present invention;

[0033] Figure 11 It is Figure 1 A three-dimensional view of the peritoneal dialysis three-way joint structure;

[0034] Figure 12 It is Figure 11 Another view of;

[0035] Figure 13 It is Figure 12 The front view of;

[0036] Figure 14 It is the front view of the peritoneal dialysis three-way joint structure provided by another embodiment of the present invention;

[0037] Figure 15 It is a schematic diagram of the connection between the transmission tube and the joint provided by another embodiment of the present invention;

[0038] Figure 16 It is the front view of the peritoneal dialysis three-way joint structure provided by another embodiment of the present invention;

[0039] Figure 17 It is the front view of the peritoneal dialysis three-way joint structure provided by another embodiment of the present invention;

[0040] Figure 18 It is a schematic diagram of the structure of a disposable drainage bag provided by another embodiment of this application;

[0041] Figure 19 It is a schematic diagram of the structure of a disposable drainage bag provided by another embodiment of this application;

[0042] Figure 20 It is Figure 19 The three-dimensional structure diagram of the drainage bag joint;

[0043] Figure 21 It is a schematic diagram of the structure of a disposable drainage bag provided by another embodiment of this application;

[0044] Figure 22 It is Figure 21 The schematic diagram of the drainage bag joint structure;

[0045] Figure 23 It is Figure 21Stereoscopic structure diagram of the connecting joint;

[0046] Figure 24 Is the front view of the structure of the connecting joint of another embodiment;

[0047] Figure 25 Is Figure 23 Schematic diagram of the connection between the connecting joint and the transmission tube;

[0048] Figure 26 Is the structural schematic diagram of the connecting joint in another embodiment;

[0049] Figure 27 Is the front view of the structure of the connecting joint in another embodiment;

[0050] Figure 28 Is the front view of the structure of the connecting joint in another embodiment;

[0051] Figure 29 Is the front view of the structure of the connecting joint in another embodiment;

[0052] Figure 30 Is the schematic diagram of the connection between the drainage bag joint and the transmission tube catheter provided by another embodiment;

[0053] Figure 31 Is the front view of the structure of the connecting joint provided by another embodiment;

[0054] Figure 32 Is the front view of the structure of the connecting joint provided by another embodiment;

[0055] Figure 33 Is the front view of the structure of the connecting joint provided by another embodiment;

[0056] Figure 34 Is Figure 31 Schematic diagram of the connection between the connecting joint and the transmission tube catheter. Detailed implementation manners

[0057] 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, a transmission 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.

[0058] Of course, in other embodiments, it can also be provided as Figure 18 、 Figure 19The disposable drainage bag shown is used to drain fluids such as urine, wound drainage fluid, oozing blood, or effusion. Its liquid storage bag 6 can also be referred to as a waste liquid bag. It is in a flat, empty bag state before use and during use, the drainage fluid is drained into the liquid storage bag 6 for storage.

[0059] 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 connector 10. As Figures 2 to 8 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 prevents the dialysis Luer connector 15 from being contaminated. The protective cap 8 has a pull ring, by which 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 outside the body to connect the transfer tube assembly 50 and the peritoneal catheter, blocking or allowing the flow of peritoneal dialysis fluid or waste liquid. The external peritoneal dialysis tube is connected to the dialysis Luer connector 15 in a male-female Luer connector manner.

[0060] 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. It contains peritoneal dialysis medicine solution inside and has an overall 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 is communicated with the second bag connection end 25.

[0061] 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 conduits 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.

[0062] As Figure 1 、 Figure 2As 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 the bag connection end 61. The drainage bag connector 5 is an integrally injection-molded 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-covered dialysis three-way connector 10. Preferably, the material of the drainage bag connector 5 is the same as the material of the membrane-covered 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 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.

[0063] In this embodiment, the drainage bag connector 5 is connected to the middle position of the bag connection end 61. The first bag body 6 has a bag connection end 61 fixedly welded to the first connection end 501. The drainage bag connector 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 connector 5. The non-stickingly fitting fixed connection method can be to mechanically cold-push the tube end onto the outside of the connector without manual pushing and applying glue, improving the manufacturing efficiency.

[0064] 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, while using the mechanical automatic cold insertion 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 connector and the transmission catheter is increased to more than 3 times, significantly improving the manufacturing efficiency.

[0065] As Figures 3 to 6 shown, the drainage bag connector 5 extends along its length direction H; the drainage bag connector 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 connector 5 and the second transmission tube 4 in this embodiment are the same, which is convenient for forming a fitting and sealing structure due to the similar materials after the two are connected, 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.

[0066] 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 10As shown, relying on the structures of the vertical step 54, the reduced-diameter portion 56, and the expansion portion 55, the pipe end 41 of the second transfer pipe 4 is non-stickingly attached and hooked outside the second connection end 502 of the drainage bag connector 5. Among them, the outer diameter of the reduced-diameter portion 56 is greater than the inner diameter of the second transfer pipe 4. Furthermore, when the pipe end 41 of the second transfer pipe 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 in close contact (non-stickingly attached) with the outer wall of the reduced-diameter portion 56, improving the connection strength and ensuring the sealing performance.

[0067] 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 pipe end 41 of the second transfer pipe 4. When the second transfer pipe 4 passes through the vertical step 54, it contracts and changes its diameter under its own elastic recovery. Furthermore, the vertical step 54 hooks the second transfer pipe 4 to form a stop for the second transfer pipe 4, as Figure 9 , Figure 10 shown. On the basis of their close connection, a physical hooking structure is formed to ensure the stability of the connection.

[0068] 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 less than the inner diameter of the second transfer pipe 4, and the diameter at the port of the end chamfer 551 is less than the inner diameter of the second transfer pipe 4. In this way, when squeezing and pushing in, it is convenient for the end of the drainage bag connector 5 to be inserted into the pipe end 41 of the second transfer pipe 4 by relying on the end chamfer 551, and it is gradually pushed in to expand the pipe end 41 of the second transfer pipe 4. Of course, the outermost (the lowest when facing Figure 3 ) expansion portion 55 is preferably a conical structure to facilitate squeezing in and expanding the pipe end 41 of the second transfer pipe 4.

[0069] The connection length between the pipe end 41 of the second transfer pipe 4 and the second connection end 502 is greater than the length of the expansion portion 55. Specifically, the connection length between the pipe end 41 of the second transfer pipe 4 and the second connection end 502 is between 5 mm and 30 mm. When the second transfer pipe 4 is connected to the drainage bag connector 5, the expansion portion 55 is sleeved inside the pipe end 41 of the second transfer pipe 4. The pipe end 41 of the second transfer pipe 4 is connected to the first connection end 501 by cold insertion.

[0070] As Figure 9 shown, the pipe end 41 of the second transfer pipe 4 mainly includes a first sleeve portion 412 sleeved outside the reduced-diameter portion 56 and a second sleeve portion 411 sleeved on the expansion portion 55. Among them, the inner diameter of the first sleeve portion 412 is greater than the inner diameter of the second transfer pipe 4 (non-pipe end part), that is, the first sleeve portion 412 is still in a state of being expanded and enlarged by the reduced-diameter portion 56, ensuring their close contact and sealing. The second sleeve portion 411 is sleeved outside the expansion portion 55 and is in close contact with the outer wall of the expansion portion 55.

[0071] To form an effective physical hooking structure, the length of the reduced-diameter portion 56 is greater than or equal to 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 portion 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 6m, the length of the reduced-diameter portion 56 is 2mm or more.

[0072] The expansion portion 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, ensuring the connection strength between the second transfer tube 4 and the corresponding drainage bag connector 5. Furthermore, the expansion portion 55 is provided with 1, 2, or 3, and the reduced-diameter portion 56 is provided with 1, 2, or 3. In Figure 10 the illustrated embodiment, the vertical steps 54 (54a, 54b), the expansion portions 55 (55a, 55b), and the reduced-diameter portions 56 (56a, 56b) are all two. The second transfer tube 4 is sleeved on the vertical steps 54 (54a, 54b), the expansion portions 55 (55a, 55b), and the reduced-diameter portions 56 (56a, 56b) to form a two-stage hooking structure.

[0073] In the existing connection process lacking the wing structure 52, when the two bag mouth film layers 611 are butt-jointed on both sides of the joint of the single tube body, it is easy to generate seam gaps, especially at the butt-joint 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 tube 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 tube body form a complete circular sealing structure.

[0074] As Figure 1 、 Figure 3 、 Figure 7 、 Figure 8 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 injection-molded integrally with the main body tube 51. The bag connection end 61 has bag mouth film layers 611 that are relatively connected. The main body tube 51 and the wing structure 52 are fixedly clamped between the two bag mouth film layers 611a, 611b. The wing structure 52 is laid flat between the two bag mouth film layers 611a, 611b. The wing structure 52 extends along a radial direction. The wing structure is laid 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.

[0075] Among them, to form better connection quality, the connecting thin sheet 521 has two welding planes 527 facing away from each other. When the wing structure 52 is laid flat between the two bag mouth film layers 611a and 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 sheet 521 provides the welding plane 527 instead of an uneven welding surface, so as to adapt to the thin sheet characteristics of the connecting thin sheet 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, for example, Figure 5 as shown in the inclined plane, or can be, for example, Figure 5 the vertical plane shown.

[0076] Among them, the first connection end 501 of the bag connection end 61 and the drainage bag joint 5 can adopt power frequency pulse welding (also known as: power frequency heating welding). With the presence of the wing structure 52, after the drainage bag joint 5 is located between the two bag mouth film layers 611, welding once can achieve the sealing of the first bag body 6 and the fixed connection between the first bag body 6 and the drainage bag joint 5. A sealing strip 65 for sealing the bag connection end 61 is formed through welding.

[0077] Such 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. Furthermore, the wing structure 52 has a fusion part 525 that is fused 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 is compared with 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, and its area or radial length is reduced. During the welding process, the wing structure 52 will lose part of its area. The part of the area lost by the wing structure 52 melts with the bag mouth film layer 611 to form an integral structure, which not only improves the connection area between the first bag body 6 and the drainage bag joint 5 as a whole, but also ensures the bonding strength between the two, ensuring the connection stability between the drainage bag joint 5 and the first bag body 6 and preventing the problem of detachment. Among them, it can be seen from the Figure 8 schematic diagram that the connecting thin sheet 5211 retained after welding has a reduced area or radial length compared to the connecting thin sheet 5212 in the non-connected state.

[0078] In this embodiment, the drainage bag connector 5 is provided with a wing structure 52. Two bag mouth film layers 611a and 611b cover the body tube 51 and span across the body tube 51, covering the wing structure 52 on both sides of the body tube 51. Even if there is a docking gap between the two bag mouth film layers 611a and 611b, the presence of the wing structure 52 can fill the corresponding docking gap. 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 docked on one side of the body tube 51. They only need to be kept close to the surface of the wing structure 52 for welding. In this way, the requirements for the docking 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.

[0079] In this embodiment, the wing structure 52 includes connecting thin sheets 521 (521a, 521b) distributed on both sides of the 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 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 body tube is 1 - 10 mm. Preferably, the length L1 is 3 - 8 mm. Among them, there can be more than 2 connecting thin sheets 521, which are symmetrically distributed. Two or more of the wing structures 52 are provided along the length direction H of the body tube 51. 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 body tube 51 and an outer end away from the 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.

[0080] There are various shapes of the connecting thin sheet 521. In this embodiment, the shape of the connecting thin sheet (the cross-section in the longitudinal section, Figure 3 the cross-section shown in the 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 convex and concave parts arranged in a staggered manner along the length direction H of the body tube. The convex and concave parts can be arranged in an equidistant staggered manner or irregularly arranged, and each convex and concave part can be the same or different. Of course, preferably, the convex and concave parts 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 can be in the shape of a triangular spike, rectangular, irregular shape, etc., and the present application does not make any restrictions.

[0081] Considering that if the smooth body tube is directly welded to the bag connection end 61, during the welding process, the outer wall surface of part of the body tube melts and fuses with the bag mouth film layer 611 of the bag connection end 61, and the melted part of the body tube material is likely to overflow to form unwanted protruding foreign matters, which affect the welding quality inside the bag mouth film layer 611 and lead to poor sealing.

[0082] As Figure 3 shown, to ensure the connection quality between the first connection end 501 and the bag connection end 61, a connection convex ring 58 is further provided on the outer wall of the body tube 5151 at the first connection end 501, and the connection convex ring 58 protrudes from the outer wall surface of the body tube 51. The width W2 of the connection convex ring 58 along the length direction H of the 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 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 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 mirror-symmetrically distributed on both sides of the connection thin plate 521.

[0083] Specifically, the outer wall area of the 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 body tube 51, as Figure 3 shown, there are two wing structures 52 (two pairs of connection thin plates 521) on the body tube 51, and correspondingly, there are two connection areas on the body tube 51 where connection convex rings 58 are correspondingly arranged.

[0084] By providing the connection convex rings 58 arranged at intervals and forming filling grooves between the connection convex rings 58, during the welding process, the connection convex rings 58 first melt and overflow to the side and flow into the filling grooves. In this way, it is difficult to form protruding foreign matters in the connection area and affect the welding quality. The height of the connection convex rings 58 gradually decreases under high-temperature welding and gradually becomes flush with the overflowing 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 welding precision requirements for the drainage bag joint 5 and the welding head, and provide a connection structure with better quality, reducing the processing and manufacturing process difficulty.

[0085] As Figure 2 、 Figure 3As shown, the bag connection end 61 has at least one weld strip 570 that welds the bag mouth film layer 611 relatively; the number of the wing structures 52 is equal to the number of the weld strips 570, and they are aligned one by one in the width direction of the first bag body 6. The weld strip 570 continuously extends from one side of the first bag body 6 in the width (the left-right direction when facing Figure 1 ) to the other side, and spans across the drainage bag joint 5. The bag connection end 61 and the drainage bag joint 5 are welded integrally 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, the two are also equal to the length of the connecting area in the length direction H.

[0086] 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 joint 5. Similarly, the weld strip 570 on the connecting thin sheet is also a continuous weld in the length direction H.

[0087] The structure of the Luer three-way joint currently used in peritoneal dialysis is such that due to the need for multiple threaded connections with the external peritoneal dialysis tube, in order to avoid wear on the joint or severe wear, it uses PVC and TPEE to form two parts of the Luer three-way joint respectively. On the one hand, the joint 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 joint 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 joint are relatively mature, which also forms a certain degree of obstruction to the formation of improved processes.

[0088] As Figures 11 to 17 shown, compared with the above traditional design, in this embodiment, the peritoneal dialysis three-way joint 10 is an integral structure rather than a split structure. The peritoneal dialysis three-way joint 10 with the dialysis Luer joint 15, the liquid inlet joint 12, and the liquid outlet joint 11 is an integrally injection-molded structure. Therefore, there is no need to manufacture the parts separately and then assemble them, which simplifies the assembly process, can improve the manufacturing efficiency, and there is no split connection part on the peritoneal dialysis three-way joint 10, and its own structural strength is higher.

[0089] In the prior art, it takes about 1 piece per 7 seconds to manufacture and assemble a single peritoneal dialysis three-way joint by inserting a PVC three-way joint with a split structure into a dialysis Luer connector and then performing high-frequency welding. However, the injection molding time of the peritoneal dialysis three-way joint 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 the manufacturing cost, reducing the manual assembly process, and improving the process manufacturing level.

[0090] 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 both are 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.

[0091] The material of the peritoneal dialysis three-way joint 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. In this way, the main materials of the peritoneal dialysis three-way joint 10 and the transmission tube in this embodiment are both the matrix material and the elastic material. After the two are fitted, a fitting and sealing structure can be formed due to the similar materials, which not only facilitates the connection between the two but also can avoid connection leakage.

[0092] Compared with the traditional PVC material, the peritoneal dialysis three-way joint 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 joint 10 or the transmission catheter material in this embodiment of the application can be burned, and it is not easy to produce harmful substances during the burning process.

[0093] In the peritoneal dialysis three-way joint 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 joint 10 is consistent, it is made of a transparent or semi-transparent material (similar to the effect of frosted glass). During the peritoneal dialysis process, the flow of the liquid can be observed through the peritoneal dialysis three-way joint 10, which is convenient for the operation of the corresponding external peritoneal dialysis tube, reduces the probability of operation errors, and improves the use experience.

[0094] In this embodiment, the peritoneal dialysis three-way joint 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 joint 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 joint 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.

[0095] As Figure 11 , Figure 12 , Figure 13 , Figure 14 shown, 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 the user to apply force to generate relative rotation with the external peritoneal dialysis 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.

[0096] 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, and 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.

[0097] As Figures 11 to 14 shown, 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 into an integral structure and form a Luer connector structure. Among them, the dialysis Luer connector 15 is a female Luer connector, which is matched and connected with the male Luer connector of the external peritoneal dialysis tube.

[0098] 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 external peritoneal dialysis tube to be inserted. And 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 external peritoneal dialysis tube.

[0099] For the convenience of connecting with the external peritoneal dialysis tube and avoiding wear and damage to the external peritoneal dialysis 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 external peritoneal dialysis 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 of the external peritoneal dialysis tube when connecting with it, and ensure the service life of the external peritoneal dialysis tube.

[0100] Optionally, to improve the sealing performance and avoid leakage, a sealing step 155 is further provided inside the outer tube sleeve 150. The sealing step 155 is located on the inner wall of the smooth wall section 151. In this way, a stepped hole structure is formed on the inner wall of the outer tube sleeve 150, and it is butted with the corresponding structure of the male Luer connector of the external peritoneal dialysis tube 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 smooth 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.

[0101] In this embodiment, the tube end of the first transmission tube 3 is non-stickingly fitted over the liquid inlet joint 12. The tube end of the second transmission tube 4 is non-stickingly fitted over the liquid outlet joint 11. The tube end of the transmission tube itself is butt-jointed and extruded by cold pushing (in a non-heated state, for example: at room temperature), so that the tube end expands, and then the liquid inlet joint 12 and the liquid outlet joint 11 are respectively inserted into the corresponding first transmission tube 3 and second transmission tube 4. The tube ends of the first transmission tube 3 and the second transmission 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.

[0102] The first transmission tube 3 and the second transmission tube 4 of this embodiment are connected to the liquid inlet joint 12 and the liquid outlet joint 11 without heating them to make them soft and then inserting them. Therefore, the first transmission tube 3 and the second transmission 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 this does not occur in the tube end connection structure of this embodiment. 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, there is no adhesive layer between them, and it is in a physical close contact state. The non-stickingly fitted fixed connection method can mechanically cold-push the tube end over the joint without manual pushing, thereby improving the manufacturing efficiency.

[0103] Wherein, 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 through 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 the present 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 shapes to a certain extent.

[0104] As Figures 14 to 17 shown, to improve the connection strength between the first transfer tube 3, the second transfer tube 4 and the corresponding liquid inlet joint 12, 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 tube. The width of the connection step 113 is between 1 and 20 mm.

[0105] Through the connection step 113, a hooking structure can be formed for the tube end of the transfer tube. When the transfer tube passes through the connection step 113 and recovers elastically by itself, its diameter shrinks, and then the connection step 113 hooks the transfer tube to form a backstop for the transfer tube, as Figure 15 shown. On the basis of their close connection, the stability of the connection is ensured by forming a physical hooking structure. 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 tube (the first transfer tube 3, the second transfer tube 4). The diameter at the port of the chamfered end 119 is smaller than the inner diameter of the transfer tube (the first transfer tube 3, the second transfer tube 4). In this way, it is convenient for the ends of the liquid inlet joint 12 and the liquid outlet joint 11 to be inserted into the tube end of the transfer tube during extrusion and pushing, and gradually pushed in to expand the tube end of the transfer tube. 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 tube end of the transfer tube.

[0106] 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 greater than the inner diameter of any one of the first transfer tube 3 and the second transfer tube 4. Furthermore, when the first part 36 of the tube end of the transfer tube retracts 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.

[0107] As Figure 15As shown, the tube end of the transfer tube mainly includes a first part 36 sleeved outside the reduced-diameter section 112 and a second part 35 sleeved outside the expanded section 111. Among them, the inner diameter of the first part 36 is greater than the inner diameter of the transfer tube (non-tube-end part). That is to say, the first part 36 is still in the state of being expanded by the reduced-diameter section 112 to ensure tight sealing between the two. The second part 35 is sleeved outside the expanded section and closely adheres to the outer wall of the expanded section.

[0108] To form an effective physical hooking structure, the length of the reduced-diameter section 112 is more than 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 more than 2mm.

[0109] The expanded section 111 is a cylindrical or conical structure. As Figure 16 , Figure 17 shown, both the liquid inlet joint 12 and the liquid outlet joint 11 can have multiple connecting steps 113 to form a multi-stage physical hooking structure rather than a chemical connection method, ensuring the connection strength between the first transfer tube 3, the second transfer tube 4 and the corresponding liquid inlet joint 12, liquid outlet joint 11. Correspondingly, multiple expanded sections 111 (111a, 111b), reduced-diameter sections 112 (112a, 112b), and connecting steps 113 (113a, 113b) can be provided. Preferably, the expanded section 111 has 1, 2, or 3, and the reduced-diameter section 112 has 1, 2, or 3.

[0110] Of course, the structure of the second connection end 502 in the above embodiment and the structure of the liquid inlet joint 12 or the liquid outlet joint 11 can be referred to and combined with each other; the connection method between the drainage bag joint 5 and the second transfer tube 4 is also the same as the connection method between the liquid inlet joint 12 or the liquid outlet joint 11 and the first transfer tube 3 or the second transfer tube 4, and can be referred to and combined with each other. The descriptions of the reduced-diameter part 56 and the reduced-diameter section 112, and the expanded part 55 and the expanded section 111 can also be referred to and combined with each other, and no other details will be elaborated in this application.

[0111] As Figures 1 to 20 shown, an embodiment of the present application also provides a drainage bag joint 5. The drainage bag joint 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.

[0112] The first connection end 501 includes a longitudinally extending body tube 51 and a wing structure 52 integrally provided on the outer side wall of the body tube 51; the wing structure 52 includes connecting thin plates 521 symmetrically arranged on both sides of the body tube 51, and the connecting 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.

[0113] The 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 oozing, 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 drained fluid in the liquid storage bag 6 during use.

[0114] This application also provides a disposable drainage bag as shown in Figure 18 , Figure 19 and includes: 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 fluid. 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.

[0115] 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, which 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 virtue 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.

[0116] In this embodiment, the transmission catheter 30 is made of non-PVC material, and a liquid stop clip 40 can also be provided thereon. Specifically, the material of the transmission catheter 30 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.

[0117] As shown in Figure 1 , Figure 2As 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. 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 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.

[0118] As 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 it has a first connection end 501 and a second connection end 502 along its length direction. The second connection end 502 is used to fixedly connect a transmission conduit 30 (such as the above-mentioned first transmission tube 3 or second transmission tube 4). The first connection end 501 is used to fixedly connect the liquid storage bag 6. This drainage bag connector 5 can form a disposable drainage bag as Figure 21 shown with the transmission conduit 30 and the connection joint 10. 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.

[0119] The drainage bag connector 5 includes a longitudinally extending body tube 51 and wing structures 52 integrally provided on the outer 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. The connecting thin plates 521 have two welding planes facing away from 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.

[0120] 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.

[0121] 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 drainage bag connector shown. As Figure 21 , Figure 22As shown, the connecting thin sheet 521 continuously extends from at least one weld strip to another weld strip. Further, the connecting thin sheet 521 continuously spans across all weld strips. For the convenience of manufacturing and to improve manufacturing efficiency, the connecting thin sheet 521 extends from one end of the main body tube 51 to the other end of the main body tube 51, and the connecting thin sheet 521 has the same length as the drainage bag joint 5 (or the main body tube 51). Of course, it can also be as Figure 30 shown, the connecting thin sheet 521 has a longer length and only needs to span multiple weld strips, without the need to have the same length as the main body tube 51. For example, the length of the connecting thin sheet 521 is more than 0.5 times the length of the main body tube 51.

[0122] Specifically, the length of the connecting thin sheet 521 (the length in the length direction of the main body tube 51) is more than 0.02 mm, and its length can be between 0.02 mm and 20 mm. Preferably, its length is between 5 mm and 15 mm. The thickness of the connecting thin sheet 521 is 0.05 - 2 mm.

[0123] Of course, the thickness and the radial length (width) of the connecting thin sheet 521 can refer to the description in the above embodiments and will not be elaborated here.

[0124] 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 drainage bag joint 5 and the transmission catheter 30 are made of similar or the same material. Thus, after being sleeved, they can directly form a bond, and the bonding quality is firm. Heat the second connecting end 502 to expand and soften it, then insert one end of the transmission catheter 30 into the second connecting end 502. After cooling, it forms a bonded fixation without glue or adhesive. Of course, after inserting one end of the transmission catheter 30 into the second connecting end 502, secondary heating can be carried out so that both of them are in a non-molten expanded and softened state and then naturally cooled.

[0125] In a preferred connection method, one end of the transmission catheter 30 can be directly cold-inserted into the second connecting end 502. 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 flaring the second connecting end 502 and inserting one end (the insertion end) of the transmission catheter 30, after releasing the second connecting end 502, the second connecting end 502 shrinks and fits with the transmission catheter 30. They are made of similar or the same material, and thus a firm connection relationship is formed when they fit. By means of cold insertion, the insertion end of the transmission catheter 30 non-stickily fits and is sleeved inside the second connecting end 502.

[0126] In the application of the cold insertion connection mode between the transfer conduit 30 and the second connection end 502 to the above-mentioned drainage bag connector 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 1% - 50% greater than the inner diameter of the second connection end 502, 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 connector 5 is an integrally injection-molded structure, and the material of the drainage bag connector 5 is the same as that of the second transfer tube 4. One end of the second transfer tube 4 is cold-inserted into the second connection end 502. 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.

[0127] Through further research, it is found that after the high-temperature sterilization process of the hook structure connecting the above-mentioned connector and the transfer tube, due to the different materials of the connector 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 hook structure between the connector and the transfer tube is damaged. Another problem is that the fitting seal between them is damaged, resulting in a decrease in the yield rate after the sterilization process.

[0128] 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 connector 5, three-way joint 10, or Figure 29 the Luer joint shown in, of course, any structure with a hook structure between the connector and the transfer tube can adopt the improved structure of this embodiment.

[0129] 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 connector 5, 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 connector in the above embodiment as an improved structure.

[0130] An attachment ring 80 is fixedly sleeved outside the constriction section 112. A seal is provided between the attachment ring 80 and the outer wall of the constriction section 112. The attachment ring 80 is sleeved on the outer wall of the constriction section 112 in an elastically contractible manner to provide a seal therebetween. Further, to prevent the attachment ring 80 from shifting during the cold insertion of the joint, a stop structure is fixedly provided outside the constriction section 112. The attachment ring 80 is sleeved on the outer wall of the constriction section 112 between the stop structure and the connection 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 attachment ring 80 retracting during cold insertion.

[0131] Among them, the stop structure is a raised structure fixedly connected to the outer wall of the constriction section 112. It 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 attachment 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.

[0132] In addition, in a feasible embodiment, the attachment ring 80 can be directly injection-molded outside the constriction section 112. In this case, the stop structure may not be provided, and the attachment ring 80 is sealingly connected to the outer wall of the constriction section 112.

[0133] The material of the attachment ring 80 is not the same as that of the joint (main body), that is, the material of the attachment ring 80 is different from the materials of the above-mentioned drainage bag joint 5 and tee joint 10. The material of the attachment ring 80 is similar to or the same as the material of the transmission tube (transmission conduit 30). The attachment ring 80 is provided at the outer end of the constriction section 112, close to the connection step 113. The outer diameter of the attachment ring 80 is greater than or equal to the outer diameter of the expansion section 111, and the outer diameter of the attachment ring 80 is greater than or equal to the outer diameter of the connection step 113. Preferably, the outer diameter of the attachment ring 80 is more than 0.1 mm greater than the outer diameter of the connection step 113 (or the expansion section 111). For example, the outer diameter of the attachment ring 80 is 0.1 mm to 2 mm greater than the outer diameter of the connection step 113 (or the expansion section 111), so as to maintain the sealed fit with the transmission conduit 30 and the stability of the hook structure through the protruding attachment ring 80 after high-temperature sterilization.

[0134] In this embodiment, the elastic modulus of the connecting ring 80 is greater than that of the joint body, and thus 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.

[0135] 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 that of the elastic material of the joint body. Since the material of the connecting ring 80 is the same as or similar to that of the transmission conduit 30, the two can form material fusion after the high-temperature sterilization process, and thus the material of the connecting ring 80 and the transmission conduit 30 form a stable adhesive seal.

[0136] 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 room 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.

[0137] 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 shown, the cross-section of the connecting ring 80 can be triangular (inverted cone), rectangular, trapezoidal, or irregular shape (special-shaped ring), and this application does not make any restrictions. The connecting ring 80 can be one or more than two, and this application also does not make any restrictions.

[0138] It should be noted that the drainage bag joints and disposable drainage bags in each embodiment of this application can be referred to and cited with each other, and the repeated parts will not be elaborated.

Claims

1. A peritoneal dialysis three-way connector, characterized in that, The peritoneal dialysis three-way connector has a connector body and a connecting ring provided on the connector body; the connector body has a dialysis Luer connector, a liquid inlet connector, and a liquid outlet connector; a protective cap is detachably covered on the dialysis Luer connector; the dialysis Luer connector is used to connect the external peritoneal dialysis tube; the connector body having the dialysis Luer connector, the liquid inlet connector, and the liquid outlet connector is an integrally injection-molded structure as a whole; The connector body is provided with a reduced-diameter section and an expanded section; the annular interface of the reduced-diameter section and the expanded section forms a connecting step; the connecting step is fixedly sleeved inside the butt-jointed transmission tube; the connection between the connecting ring and the outer wall of the reduced-diameter section is sealed; the elastic modulus of the connecting ring is greater than the elastic modulus of the connector body.

2. The peritoneal dialysis three-way connector according to claim 1, characterized in that, A stop structure is also fixedly provided outside the reduced-diameter section; the connecting ring is sleeved outside the reduced-diameter section between the stop structure and the connecting step in an elastically contractible manner.

3. The peritoneal dialysis three-way connector according to claim 2, wherein, The stop structure includes a stop ring integrally injection-molded with the connector body; the outer diameter of the stop ring is less than or equal to the outer diameter of the connecting ring.

4. The peritoneal dialysis three-way connector according to claim 1, wherein, The material of the connecting ring is different from the material of the connector body, and both are non-PVC materials.

5. The peritoneal dialysis three-way connector according to claim 1, characterized in that, The material of the connecting ring is the same as the material of the transmission tube.

6. The peritoneal dialysis three-way connector according to claim 1, characterized in that, The weight percentage of the elastic material of the connecting ring is greater than the weight percentage of the elastic material of the connector body.

7. The peritoneal dialysis three-way connector according to claim 1, characterized in that, Both the liquid inlet connector and the liquid outlet connector are provided with a reduced-diameter section and an expanded section, and the annular interface of the reduced-diameter section and the expanded section forms a connecting step; the connecting ring is fixedly sleeved outside the reduced-diameter section.

8. The peritoneal dialysis three-way connector according to claim 7, wherein The outer diameter of the connecting ring is greater than or equal to the outer diameter of the connecting step.

9. The peritoneal dialysis three-way connector according to claim 7, characterized in that, The outer diameter of the connecting ring is more than 0.1 mm greater than the outer diameter of the connecting step.

10. The peritoneal dialysis three-way connector according to claim 1, wherein The connecting ring is a circular ring.

Images