Anti-backflow catheter connector for medical drainage metering box

Abstract

An anti-backflow catheter connector for a medical drainage metering box comprises a pipeline connector used for being connected with a pipeline for outputting urine or chest metering liquid of a human body; the transition joint piece is connected to the pipeline joint and is communicated with the pipeline joint; the flow guide part is connected to the end, away from the pipeline connector, of the transition connector part and communicated with the transition connector part, the flow guide part comprises a connecting cover body and a drainage tube plug, the connecting cover body is provided with an opening, the interior of the connecting cover body is a connecting cover body inner cavity, the transition connector part body plate is connected to the opening of the connecting cover body, and the drainage tube plug is formed on the connecting cover body; the anti-backflow piece is arranged at the opening of the inner cavity of the connecting cover body and attached to the transition connector piece main body plate, the anti-backflow piece moves towards the inner cavity of the connecting cover body to be opened when internal liquid flows towards the flow guide piece from the transition connector piece, and the anti-backflow piece is closed when the internal liquid is pressurized in the opposite direction. The anti-backflow device has the advantages that liquid backflow is prevented, secondary infection is avoided, the sealing matching effect is good, and the use safety is improved.

Description

[0001] This application is a divisional application of the Chinese patent application with application number 202321886608X, application date July 18, 2023, and invention name “A reflux prevention catheter connector for a medical drainage metering box”. Technical Field

[0002] The utility model belongs to the technical field of medical instruments, and in particular relates to an anti-reflux catheter connector for a medical drainage metering box. Background Art

[0003] The above-mentioned medical drainage metering box is a medical device commonly used in medical and health places such as hospitals and nursing homes. It is mainly used to collect urine and drainage fluid from the chest and abdominal cavity. Specifically, for some elderly people or patients with kidney and urinary tract diseases, they are prone to urinary incontinence. Urinary incontinence not only causes odor in the patient's body, but also causes skin erosion, repeated urinary tract infection, and even complications in severe cases if not treated in time. While it may cause embarrassment, fear, inferiority and self-loathing in patients, it has a great impact on patients physiologically and psychologically. The medical drainage metering box can collect and measure urine for these urinary incontinence people or catheterization patients. On the one hand, it can collect urine to relieve the patient's pain. On the other hand, it is also convenient for medical staff to understand the patient's pathological condition and reasonably adjust the medication and treatment plan and nursing measures according to the pathological condition. For some patients who have undergone thoracic and abdominal surgery, the drainage metering box can also collect and measure the patient's drainage fluid. For relevant technical knowledge about medical drainage metering boxes, please refer to the patent document with announcement number CN210963556U previously applied for by the applicant; however, the existing drainage metering boxes including CN210963556U have the following problems in actual use: since the existing drainage metering boxes input human urine or drainage fluid into the metering box through a drainage tube, when the metering box is full of liquid, if the nursing staff, especially the patient's family members and accompanying personnel, fail to release the urine or drainage fluid in the metering box in time due to negligence, the urine or drainage fluid will flow back along the drainage catheter, which will not only cause the drainage tube to be blocked, but also the human urine or drainage fluid cannot be discharged, causing great discomfort to the body, and it is also easy to cause secondary infection. What is more serious is that once the urine or drainage fluid is discharged into the patient's body, this will cause medical accidents and even endanger the patient's life.

[0004] In view of this, it is necessary to provide a mechanism that can prevent the liquid in the metering box from flowing back. The technical solution to be introduced below is produced in this context. Utility Model Content

[0005] The task of the utility model is to provide a reflux prevention catheter connector for a medical drainage metering box with a compact structure and firm assembly, which helps to prevent liquid reflux by setting an anti-reflux sheet, thereby improving safety and embodying a reliable sealing and matching effect.

[0006] The task of the utility model is accomplished in this way. A reflux prevention catheter connector for a medical drainage metering box comprises: a pipeline connector for connecting to a pipeline for outputting human urine or chest cavity metering fluid; a transition connector connected to the pipeline connector and communicating with the pipeline connector, and the transition connector is provided with a transition connector body plate; a flow guide fixedly connected to an end of the transition connector away from the pipeline connector, and the flow guide comprises a connecting cover and a drainage pipe plug, and the connecting cover has an opening toward the transition connector. The opening and the interior of the connecting cover body are constituted as a connecting cover body cavity, the main body plate of the transition joint component is fixedly connected to the open mouth of the connecting cover body, the drainage pipe plug is constituted on the connecting cover body and is in conduction with the inner cavity of the connecting cover body; an anti-reflux sheet is movably positioned at the open mouth of the inner cavity of the connecting cover body and is attached to the main body plate of the transition joint component, the anti-reflux sheet moves toward the inner cavity of the connecting cover body and opens when the internal liquid flows from the transition joint component toward the flow guide component, and the anti-reflux sheet will be closed when the internal liquid is pressurized from the opposite direction.

[0007] In a specific embodiment of the present invention, a main plate mating sleeve is convexly provided on the side surface of the transition joint main plate facing the connecting cover body, and a connecting cover body mating sleeve is formed at the edge position of one end of the connecting cover body corresponding to the main plate of the transition joint part, the contour of the connecting cover body mating sleeve is adapted to the contour shape of the main plate mating sleeve, and the main plate mating sleeve and the connecting cover body mating sleeve can be fixedly connected together, thereby realizing the installation of the transition joint part and the guide member.

[0008] In another specific embodiment of the utility model, the end portion of the connecting cover body close to the drainage pipe plug is formed with a connecting cover body curved neck portion, and a plurality of sheet body positioning members are formed on the inner wall of the connecting cover body curved neck portion, the sheet body positioning member is arranged in the inner cavity of the connecting cover body, and the plurality of sheet body positioning members all extend from the connecting cover body curved neck portion to the open opening of the connecting cover body, the sheet body positioning member is tubular and has a sheet body positioning member through hole formed along its axis formed therein; and a plurality of sheet body pins are formed on a side surface of the transition joint body main body plate facing the connecting cover body and at positions corresponding to the plurality of sheet body positioning members, The plurality of sheet body pins all extend toward their respective corresponding sheet body positioning parts and can be inserted into the through holes of the sheet body positioning parts, and a plurality of insertion holes that penetrate the thickness direction of the sheet body positioning parts are opened on the anti-backflow sheet and at positions corresponding to the plurality of sheet body pins, and the plurality of sheet body pins can pass through their respective corresponding insertion holes and insert into the through holes of the sheet body positioning parts, and the plurality of sheet body pins can be installed together with the through holes of the sheet body positioning parts, so that the anti-backflow sheet is positioned at the open mouth of the inner cavity of the connecting cover and fits against the main plate of the transition joint part, that is, the anti-backflow sheet is positioned at the connection between the transition joint part and the guide part.

[0009] In another specific embodiment of the utility model, the exterior of the drainage pipe plug is a tower-shaped step structure, and a plurality of drainage pipe plug conical parts are formed on the drainage pipe plug, and the radius of one end of the drainage pipe plug conical part away from the connecting cover body is smaller than the other end.

[0010] In yet another specific embodiment of the present invention, the transition joint component and the flow guide component are both integrally injection molded components.

[0011] In another specific embodiment of the present invention, the material of the anti-reflux sheet is preferably one of rubber, silicone, TPU or TPE.

[0012] In a further specific embodiment of the present invention, the pipeline joint is a sampling head, and it includes a sampling head body, a pipeline joint plug and a pipeline joint liquid outlet sleeve, and the sampling head body is in a rectangular shape; wherein the pipeline joint plug is formed on the liquid inlet port of the sampling head body and is communicated with the liquid inlet port, and the pipeline joint liquid outlet sleeve is formed on the liquid outlet port of the sampling head body and is communicated with the liquid outlet port, and the pipeline joint liquid outlet sleeve is connected to the transition joint.

[0013] In a further specific embodiment of the present invention, a sampling port is provided on the sampling head body, and a sampling rubber sheet for inserting a medical needle is provided on the sampling port.

[0014] In yet another specific embodiment of the present invention, the exterior of the pipe joint plug is a tower-shaped step structure, and a plurality of pipe joint plug tapered portions are formed on the pipe joint plug, wherein the radius of one end of the pipe joint plug tapered portion away from the sampling head body is smaller than that of the other end.

[0015] In yet another specific embodiment of the present invention, the pipeline joint liquid outlet sleeve is tubular, and the transition joint part also includes a transition joint part inner sleeve and a transition joint part clamping sleeve formed on the side surface of the transition joint part main plate facing the pipeline joint, the transition joint part inner sleeve and the transition joint part clamping sleeve are both annular structures, and a transition joint part through hole that passes through to the transition joint part main plate is formed inside the transition joint part inner sleeve along its axis; a transition joint part clamping cavity is formed between the transition joint part inner sleeve and the transition joint part clamping sleeve, the transition joint part clamping cavity is adapted to the shape of the pipeline joint liquid outlet sleeve, and the pipeline joint liquid outlet sleeve can be fixedly installed in the transition joint part clamping cavity, thereby realizing the connection between the pipeline joint and the transition joint part.

[0016] The technical effects of the technical solution provided by the utility model are as follows: firstly, since an anti-reflux sheet attached to the main plate of the transition joint member is provided at the connection between the transition joint member and the guide member, when the internal liquid flows from the transition joint member toward the guide member, the anti-reflux sheet is opened for diversion, and the anti-reflux sheet is closed when the internal liquid is pressurized from the opposite direction and adheres to the main plate of the transition joint member, so as to intercept the refluxed liquid, thereby effectively preventing the occurrence of liquid reflux and avoiding the problem of secondary infection. At the same time, the sealing effect is good, which also greatly improves the safety of the use of the medical drainage metering box and protects the life safety of patients. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a three-dimensional structural exploded view of an embodiment of the utility model;

[0018] Figure 2 for Figure 1 A structural cross-sectional view of a transition joint member and a flow guide member in the illustrated embodiment.

[0019] In the figure: 1. pipeline joint, 11. sampling head body, 111. sampling port, 112. sampling rubber sheet, 12. pipeline joint plug, 121. pipeline joint plug tapered part, 13. pipeline joint liquid outlet sleeve; 2. transition joint, 21. transition joint main plate, 211. main plate matching sleeve, 212. sheet body pin, 22. transition joint inner sleeve, 221. transition joint through hole, 23. transition joint clamping sleeve, 24. transition joint clamping cavity; 3. flow guide, 31. connecting cover, 311. connecting cover inner cavity, 312. connecting cover matching sleeve, 313. connecting cover curved neck, 314. sheet body positioning piece, 3141. sheet body positioning piece through hole, 32. drainage pipe plug, 321. drainage pipe plug tapered part; 4. anti-reflux sheet, 41. plug-in hole; 5. liquid inlet conduit; 6. drainage tube. DETAILED DESCRIPTION

[0020] In order to more clearly understand the technical essence and beneficial effects of the present invention, a detailed description will be given below in the form of embodiments. However, the description of the embodiments is not a limitation on the scheme of the present invention. Any equivalent changes made based on the concept of the present invention that are merely formal and not substantial should be regarded as within the scope of the technical scheme of the present invention.

[0021] In the following description, all concepts related to up, down, left, right, front and back directions or orientations are based on Figure 1 The position state is taken as a reference, and therefore it cannot be understood as a special limitation on the technical solution provided by the utility model.

[0022] See also Figure 1 Combined with Figure 2, shows a reflux prevention catheter connector for a medical drainage metering box, which is sequentially connected with a pipe connector 1 connected to a pipeline for outputting human urine or pleural metering fluid, a transition joint 2, an anti-reflux sheet 4 and a guide 3, wherein: the transition joint 2 is provided with a transition joint main body plate 21, the anti-reflux sheet 4 can be movably positioned at the open mouth of the guide 3 and fit to the transition joint main body plate 21, the anti-reflux sheet 4 moves toward the inner cavity of the guide when the liquid flows from the transition joint 2 toward the guide 3 to open the channel, and the anti-reflux sheet 4 will fit to the transition joint main body plate 21 to close the channel when the liquid is pressurized from the opposite direction. Specifically, it further includes a pipe joint 1 for connecting to a pipe for outputting urine or chest drainage fluid; a transition joint 2 is also shown, which is connected to the left end of the aforementioned pipe joint 1 and is connected thereto, and the transition joint 2 has a transition joint main body plate 21; a flow guide 3 is also shown, which is fixedly connected to the left end of the aforementioned transition joint 2 and is connected thereto, and the flow guide 3 includes a connecting cover 31 and a drainage pipe plug 32, the aforementioned connecting cover 31 has an open opening facing the aforementioned transition joint 2 and the interior of the connecting cover 31 is formed with a connecting cover inner cavity 311, the aforementioned transition joint main body plate 21 is fixedly connected to the right end of the aforementioned connecting cover 31 At the opening, the drainage pipe plug 32 is formed on the connecting cover body 31 and is connected to the inner cavity 311 of the connecting cover body. A backflow prevention sheet 4 is also shown, which is movably positioned at the right end open mouth of the inner cavity 311 of the connecting cover body and is attached to the main body plate 21 of the transition joint. When the internal liquid flows from the transition joint 2 toward the flow guide member 3, the backflow prevention sheet 4 moves toward the inner cavity 311 of the connecting cover body and opens. Since the backflow prevention sheet 4 is attached to the main body plate 21 of the transition joint, when the internal liquid is pressurized from the opposite direction, the backflow prevention sheet 4 is obstructed by the main body plate 21 of the transition joint, so that the backflow prevention sheet 4 cannot open toward the main body plate 21 of the transition joint and is closed, thereby preventing the urine from flowing back.

[0023] In the present embodiment, the main body plate 21 of the transition joint member is in the shape of a shield-shaped cover plate, and a main body plate matching sleeve 211 is convexly provided on the surface of the main body plate 21 of the transition joint member facing the connecting cover body 31, and a connecting cover body matching sleeve 312 is formed at the edge position of one end of the connecting cover body 31 corresponding to the main body plate 21 of the transition joint member, and the contour of the connecting cover body matching sleeve 312 is adapted to the contour shape of the main body plate matching sleeve 211; and the contours of the connecting cover body matching sleeve 312 and the main body plate matching sleeve 211 are both shield-shaped, and the connecting cover body matching sleeve 312 is matched and installed on the outer edge of the main body plate matching sleeve 211, and the main body plate matching sleeve 211 and the connecting cover body matching sleeve 312 can be clamped and fixed by ultrasonic welding, so as to realize the fixed connection between the transition joint member 2 and the guide member 3; of course, the main body plate matching sleeve 211 and the connecting cover body matching sleeve 312 can also be fixed by other means, which will not be elaborated here.

[0024] Furthermore, the end of the connecting cover 31 close to the drain pipe plug 32 is formed with a connecting cover curved neck 313, and a plurality of sheet positioning members 314 are formed on the inner wall of the connecting cover curved neck 313, such as Figure 1 As shown, the connecting cover body curved neck portion 313 is formed at the top position of the aforementioned connecting cover body 31 and is arranged in an inclined arc shape, and as shown in FIG. Figure 2As shown, due to the arrangement of the curved neck portion 313 of the connecting cover body, the inner cavity 311 of the connecting cover body is formed into a shape in which one end portion of the upper part is contracted inwardly, and the inner cavity 311 of the connecting cover body is narrow at the upper part and wide at the lower end. This shape can facilitate the production and manufacturing of the sheet positioning piece 314; in addition, the number of the sheet positioning pieces 314 is two, and the two sheet positioning pieces 314 are arranged in the inner cavity 311 of the connecting cover body, and the two sheet positioning pieces 314 both extend from the curved neck portion 313 of the connecting cover body to the open mouth of the connecting cover body 31, and the sheet positioning piece 314 is tubular and has a sheet positioning piece through hole 3141 formed along its axis inside; and on the surface of one side of the main plate 21 of the transition joint member facing the connecting cover body 31 and at the position corresponding to the two sheet positioning pieces 314 There are two sheet body pins 212, the two aforementioned sheet body pins 212 are extended toward the corresponding sheet body positioning parts 314 and can be inserted into the sheet body positioning part through hole 3141, and the aforementioned anti-backflow sheet 4 is provided with an insertion hole 41 that runs through its thickness direction at the position corresponding to the two aforementioned sheet body pins 212, the two aforementioned sheet body pins 212 can pass through the corresponding insertion holes 41 and insert into the sheet body positioning part through hole 3141, and the two sheet body pins 212 can be installed together with the sheet body positioning part through hole 3141, so that the aforementioned anti-backflow sheet 4 is positioned and arranged at the open mouth of the connecting cover body cavity 311 and fits on the transition joint main body plate 21, that is, the anti-backflow sheet 4 is positioned and fixed at the connection between the transition joint 2 and the guide member 3.

[0025] In the present embodiment, the exterior of the drainage pipe plug 32 is a tower-shaped stepped structure, and a plurality of drainage pipe plug conical portions 321 are formed on the drainage pipe plug 32. The radius of one end of the drainage pipe plug conical portion 32 away from the connecting cover body 31 is smaller than that of the other end. By providing the drainage pipe plug conical portion 321, the connection between the drainage pipe plug 32 and the pipeline can be more convenient, and the connection is more secure after the connection, and the drainage pipe plug 32 will not be separated from the pipeline body.

[0026] Preferably, the transition joint member 2 and the flow guide member 3 are both integrally injection molded parts.

[0027] Preferably, the material of the aforementioned anti-backflow sheet 4 is preferably one of rubber, silicone, TPU or TPE materials; the anti-backflow sheet 4 itself is elastic, and can facilitate the internal liquid to flow from the transition joint 2 toward the guide member 3, and the anti-backflow sheet 4 can be easily opened, and when the internal liquid is pressurized from the opposite direction, the anti-backflow sheet 4 can fit tightly on the transition joint main plate 21 and play a role in preventing backflow.

[0028] Please continue to see Figure 1The aforementioned pipeline joint 1 is a sampling head, which includes a sampling head body 11, a pipeline joint plug 12 and a pipeline joint liquid outlet sleeve 13 connected in sequence. The pipeline joint liquid outlet sleeve 13 is connected to the transition joint 2. A sampling port 111 is opened on the sampling head body 11, and a sampling rubber sheet 112 for inserting a medical needle is provided on the sampling port 111.

[0029] The pipe joint plug 12 is connected to the liquid inlet port of the sampling head body 11 and communicated therewith, the pipe joint outlet sleeve 13 is connected to the liquid outlet port of the sampling head body 11 and communicated therewith, and the pipe joint outlet sleeve 13 is connected to the transition joint 2.

[0030] In this embodiment, a sampling port 111 is provided on the sampling head body 11, and a sampling rubber sheet 112 for inserting a medical needle is provided on the sampling port 111; medical staff can insert the needle of a medical syringe into the sampling head body 11 through the sampling rubber sheet 112, and extract the urine or chest drainage fluid flowing through the sampling head body 11 for subsequent testing.

[0031] It should be noted that, in the present embodiment, the aforementioned pipe connector 1 is a sampling head, and medical staff can collect urine or chest drainage fluid flowing through the pipe connector 1 for corresponding testing; of course, the pipe connector 1 can also be a connector with other uses and can be connected to a pipeline, such as a flow regulating connector, etc. The form and structure of the pipe connector 1 can be flexibly changed according to actual use requirements, and will not be elaborated here.

[0032] Furthermore, the exterior of the pipe joint plug 12 is a tower-shaped stepped structure, and a plurality of pipe joint plug tapered portions 121 are formed on the pipe joint plug 12, and the radius of one end of the pipe joint plug tapered portion 121 away from the sampling head body 11 is smaller than that of the other end; similarly, the drainage pipe plug tapered portion 321 can ensure the convenience of assembly and firmness of the drainage pipe plug 32 and the pipeline.

[0033] Furthermore, the aforementioned pipe joint outlet sleeve 13 is tubular, and the aforementioned transition joint 2 also includes a transition joint inner sleeve 22 and a transition joint clamp sleeve 23 formed on the right side surface of the aforementioned transition joint body plate 21, and the aforementioned transition joint inner sleeve 22 and the aforementioned transition joint clamp sleeve 23 are both annular structures, and a transition joint through hole 221 penetrating to the transition joint body plate 21 is formed inside the aforementioned transition joint inner sleeve 22 along its axis; A transition joint member clamping cavity 24 is formed between 2 and the transition joint member clamping sleeve 23, the aforementioned transition joint member clamping cavity 24 is adapted to the shape of the aforementioned pipe joint liquid outlet sleeve 13, and the aforementioned pipe joint liquid outlet sleeve 13 can be installed in the transition joint member clamping cavity 24, and the pipe joint liquid outlet sleeve 13 can be preferably firmly connected with the aforementioned transition joint member inner sleeve 22 and the transition joint member clamping sleeve 23 in a gluing manner, thereby realizing the connection and fixation of the aforementioned pipe joint 1 and the transition joint member 2.

[0034] See also Figure 1 and Figure 2 , the applicant briefly describes the working principle of the utility model: Figure 1Also shown is a liquid inlet catheter 5 and a drainage tube 6. One end of the liquid inlet catheter 5 is connected to the human body and can collect human urine or chest drainage fluid, and the other end is connected to the pipeline joint plug 12. One end of the drainage tube 6 is connected to the drainage plug, and the other end is connected to the fluid accumulation box body of the medical drainage metering box. For the connection method of the liquid inlet catheter 5 and the drainage tube 6 in the medical drainage metering box, please refer to the patent document with announcement number CN210963556U previously applied by the applicant, which will not be repeated here. During installation, first plug the pipeline joint outlet sleeve 13 of the pipeline joint 1 into the transition joint. The head piece clamping cavity 24 can realize the clamping fixation of the pipe joint 1 and the transition joint piece 2 by gluing, and then the anti-reflux sheet 4 is positioned and placed at the open mouth of the connecting cover body 31, and the transition joint piece 2 is sleeved on the guide piece 3, and at the same time, multiple sheet body pins 212 pass through the insertion holes 41 on the anti-reflux sheet 4 and are installed in the sheet body positioning piece through holes 3141, thereby realizing the clamping fixation of the transition joint piece 2, the guide piece 3 and the anti-reflux sheet 4; and when in use, human urine or other drainage fluid enters the pipe joint 1 along the liquid inlet conduit 5 and passes through the transition joint piece through hole 221 enters into the transition joint 2, and then flows onto the anti-reflux sheet 4. The anti-reflux sheet 4 is subjected to pressure and moves toward the inner cavity 311 of the connecting cover body and opens. The through hole 221 of the transition joint is connected with the inner cavity 311 of the connecting cover body, so that urine or other urine flows into the inner cavity 311 of the connecting cover body through the through hole 221 of the transition joint, and flows into the fluid box body of the medical drainage metering box through the drainage tube plug 32 and the drainage tube 6. After the drainage of urine or chest drainage fluid is completed, due to the lack of liquid pressure, the anti-reflux sheet 4 is attached to the main body plate 21 of the transition joint; when the medical drainage metering box is opened, the urine or chest drainage fluid is discharged from the main body plate 21 of the medical drainage metering box. When the liquid accumulation box body of the metering box is full of liquid and liquid refluxes into the inner cavity 311 of the connecting cover body, the anti-reflux sheet 4 is pressed tightly against the transition joint body plate 21 by the pressure of the liquid from the connecting cover body 31 toward the transition joint body plate 21, and the anti-reflux sheet 4 will not be opened. The transition joint through hole 221 and the inner cavity 311 of the connecting cover body are separated by the anti-reflux sheet 4, so that the refluxed liquid cannot enter the pipe joint 1 and the liquid inlet catheter 5, thereby avoiding the refluxed liquid from flowing back and causing catheterization or drainage failure or liquid entering the human body, thereby greatly improving safety.

[0035] In summary, the technical solution provided by the utility model makes up for the shortcomings of the existing technology, successfully completes the invention task, and faithfully realizes the technical effects stated by the applicant in the technical effect column above.

Claims

1. A reflux prevention catheter connector for a medical drainage metering box, characterized in that: A pipe joint (1) connected to a pipe for outputting human urine or pleural fluid, a transition joint (2), an anti-reflux sheet (4) and a flow guide (3) are sequentially connected, wherein: the transition joint (2) is provided with a transition joint body plate (21), the anti-reflux sheet (4) can be movably positioned at the open mouth of the flow guide (3) and abuts against the transition joint body plate (21), the anti-reflux sheet (4) moves toward the inner cavity of the flow guide to open the channel when liquid flows from the transition joint (2) toward the flow guide (3), and the anti-reflux sheet (4) abuts against the transition joint body plate (21) to close the channel when liquid is pressurized from the opposite direction.

2. The anti-reflux catheter connector for a medical drainage metering box according to claim 1, characterized in that: The flow guide member (3) comprises a connecting cover body (31) and a drainage pipe plug (32); the interior of the connecting cover body (31) is a connecting cover body inner cavity (311); the drainage pipe plug (32) is formed on the connecting cover body (31) and is in communication with the connecting cover body inner cavity (311).

3. The anti-reflux catheter connector for the medical drainage metering box according to claim 2, characterized in that A main plate matching sleeve (211) is convexly provided on the surface of the main plate (21) of the transition joint piece facing the connecting cover body (31), and a connecting cover body matching sleeve (312) matching the contour shape of the main plate matching sleeve (211) is provided on the connecting cover body (31). By fixing the main plate matching sleeve (211) and the connecting cover body matching sleeve (312) together, the connection between the transition joint piece (2) and the guide piece (3) is achieved.

4. The anti-reflux catheter connector for the medical drainage metering box according to claim 3, characterized in that At least one sheet positioning piece (314) is arranged in the inner cavity (311) of the connection cover body, the sheet positioning piece (314) is tubular and has a sheet positioning piece through hole (3141) formed therein; at least one sheet pin (212) is arranged on a surface of the transition joint body main plate (21) on one side facing the connection cover body (31), the sheet pin (212) extends toward the corresponding sheet positioning piece (314) and can be inserted into the sheet positioning piece through hole (3141).

5. The anti-reflux catheter connector for the medical drainage metering box according to claim 4, characterized in that: At least one insertion hole (41) is provided at a position of the anti-backflow sheet (4) corresponding to the sheet body pin (212), so that the sheet body pin (212) can be installed together with the sheet body positioning member through hole (3141), thereby enabling the anti-backflow sheet (4) to be positioned at the open opening of the inner cavity (311) of the connecting cover and to fit the main body plate (21) of the transition joint member.

6. The anti-reflux catheter connector for the medical drainage metering box according to claim 1, characterized in that The transition joint piece (2) and the flow guide piece (3) are both integrally injection-molded pieces.

7. The anti-reflux catheter connector for the medical drainage metering box according to claim 1, characterized in that The material of the anti-backflow sheet (4) is any one of rubber, silicone, TPU or TPE.

8. The anti-reflux catheter connector for the medical drainage metering box according to claim 1, characterized in that The pipeline joint (1) comprises a sampling head body (11), a pipeline joint plug (12) and a pipeline joint liquid outlet sleeve (13) which are connected in sequence, the pipeline joint liquid outlet sleeve (13) is connected to the transition joint (2), the sampling head body (11) is provided with a sampling port (111), and the sampling port (111) is provided with a sampling rubber sheet (112) for inserting a medical needle.

9. The anti-reflux catheter connector for the medical drainage metering box according to claim 8, characterized in that The exterior of the pipe joint plug (12) is in a tower-shaped stepped structure, and a plurality of pipe joint plug tapered portions (121) are formed on the pipe joint plug (12), wherein the radius of one end of the pipe joint plug tapered portion (121) away from the sampling head body (11) is smaller than that of the other end.

10. The anti-reflux catheter connector for the medical drainage metering box according to claim 8, characterized in that A transition joint inner sleeve (22) and a transition joint clamp sleeve (23) are provided from inside to outside on the side of the transition joint (2) facing the pipeline joint (1), and a transition joint clamp cavity (24) is formed. The transition joint clamp cavity (24) is adapted to the shape of the pipeline joint liquid outlet sleeve (13). The pipeline joint liquid outlet sleeve (13) is fixedly installed in the transition joint clamp cavity (24), thereby realizing the connection between the pipeline joint (1) and the transition joint (2).

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