CN220917933U

CN220917933U - Anti-backflow catheter connector for medical drainage metering box

Info

Publication number: CN220917933U
Application number: CN202321886608.XU
Authority: CN
Inventors: 沈建东; 周建新; 沈嘉琪
Original assignee: JIANGSU KANGNUO MEDICAL DEVICES CO Ltd
Current assignee: JIANGSU KANGNUO MEDICAL DEVICES CO Ltd
Priority date: 2023-07-18
Filing date: 2023-07-18
Publication date: 2024-05-10
Anticipated expiration: 2033-07-18

Abstract

A backflow prevention catheter adapter for a medical drainage metering box, comprising: the pipeline joint is used for being connected with a pipeline for outputting human urine or thoracic cavity metering liquid; a transition joint piece connected to and in communication with the pipe joint; the flow guide piece is connected to one end of the transition joint piece, which is far away from the pipeline joint, and is communicated with the transition joint piece, the flow guide piece comprises a connecting cover body and a flow guide tube plug, the connecting cover body is provided with an open opening, an inner cavity of the connecting cover body is arranged in the connecting cover body, the transition joint piece main body plate is connected to the open opening of the connecting cover body, and the flow guide tube plug is formed on the connecting cover body; the anti-backflow sheet is arranged at the opening of the inner cavity of the connecting cover body and is attached to the main body plate of the transition joint piece, when the internal liquid flows from the transition joint piece to the guide piece, the anti-backflow sheet moves towards the inner cavity of the connecting cover body to be opened, and when the internal liquid is pressurized in the opposite direction, the anti-backflow sheet is closed. The advantages are that: prevent that liquid from flowing back, avoid appearing secondary infection, sealed cooperation is effectual, promotes the security of using.

Description

Anti-backflow catheter connector for medical drainage metering box

Technical Field

The utility model belongs to the technical field of medical instruments, and particularly relates to an anti-backflow catheter connector for a medical drainage metering box.

Background

The medical drainage metering box is a medical instrument commonly used in medical and health places such as hospitals, nursing homes and the like, and is mainly used for collecting urine and drainage liquid of the pleuroperitoneal cavity. Specifically, for some old people or patients with kidney and urinary tract diseases, the patients are easy to suffer from urinary incontinence, the urinary incontinence not only can cause peculiar smell to the bodies of the patients, but also can cause skin erosion, repeated urinary tract infection and even complications when serious, and can cause embarrassment, fear, spell, self aversion and other reactions to the patients, and simultaneously can cause great influence on physiology and psychology of the patients, the medical drainage metering box can collect and meter urine of the urinary incontinence crowd or catheterized patients, on one hand, can collect urine to relieve the pains of the patients, on the other hand, medical staff can know the pathological conditions of the patients and reasonably adjust medication and treatment schemes and nursing measures according to the pathological conditions, and for some patients who perform thoracic and abdominal operations, the drainage metering box can collect and meter drainage liquid of the patients. The related technical knowledge about the medical drainage metering box can be particularly found in the patent document with the publication number of CN210963556U, which is applied by the inventor before; however, the existing drainage metering box including CN210963556U has the following problems in the actual use process: because current drainage metering box is through a drainage tube with human urine or drainage liquid input into the metering box in, after the metering box is full of liquid, if nursing staff especially patient family members accompany the careless and fail to in time in the urine or the drainage liquid in the metering box, urine or drainage liquid can flow backwards along the drainage pipe, can not only lead to drainage tube shutoff, and human urine or drainage liquid can't pass through the discharge, causes the very big discomfort of health, also causes secondary infection easily, and more serious, once urine or drainage liquid is discharged into the patient, this can cause medical malpractice even endanger patient's result.

In view of the above, it is desirable to provide a mechanism for preventing the backflow of liquid in a metering box, and the technical solutions described below are created in this context.

Disclosure of utility model

The utility model aims to provide the anti-backflow catheter connector for the medical drainage metering box, which has a compact structure and is firmly assembled, and is beneficial to preventing liquid backflow by arranging the anti-backflow sheet, so that the safety is improved, and the reliable sealing and matching effects are reflected.

The task of the utility model is accomplished in such a way that a backflow prevention catheter connector for a medical drainage metering box comprises: a pipeline joint for connecting with a pipeline for outputting human urine or thoracic cavity metering liquid; a transition fitting connected to and in communication with the pipe fitting, the transition fitting having a transition fitting body plate; the flow guide piece is fixedly connected to one end part of the transition joint piece, which is far away from the pipeline joint, and comprises a connecting cover body and a flow guide tube plug, wherein the connecting cover body is provided with an opening which faces the transition joint piece, the inside of the connecting cover body is formed into a connecting cover body inner cavity, the main body plate of the transition joint piece is fixedly connected to the opening of the connecting cover body, and the flow guide tube plug is formed on the connecting cover body and is communicated with the connecting cover body inner cavity; the anti-backflow sheet is movably positioned at the opening of the inner cavity of the connecting cover body and is attached to the main body plate of the transition joint piece, the anti-backflow sheet moves towards the inner cavity of the connecting cover body to be opened when the internal liquid flows from the transition joint piece to the guide piece, and the anti-backflow sheet is closed when the internal liquid is pressurized in the opposite direction.

In a specific embodiment of the utility model, a main body plate matching sleeve is convexly arranged on one side surface of the main body plate of the transition joint towards the connecting cover body, a connecting cover body matching sleeve is formed at the position of the connecting cover body corresponding to the edge of one end part of the main body plate of the transition joint, the outline of the connecting cover body matching sleeve is matched with the outline shape of the main body plate matching sleeve, and the main body plate matching sleeve and the connecting cover body matching sleeve can be fixedly connected together, so that the installation of the transition joint and the guide piece is realized.

In another specific embodiment of the present utility model, an end portion of the connecting cover body, which is close to the drain plug, is formed with a connecting cover body curved neck portion, a plurality of sheet positioning pieces are formed on the inner wall of the connecting cover body curved neck portion, the sheet positioning pieces are arranged in the connecting cover body inner cavity, the plurality of sheet positioning pieces extend from the connecting cover body curved neck portion to the opening of the connecting cover body, and the sheet positioning pieces are tubular and internally form sheet positioning piece through holes formed along the axis of the sheet positioning pieces; the transition joint body plate is provided with a plurality of sheet body pins which extend towards the sheet body locating piece corresponding to the sheet body locating piece and can be inserted into the sheet body locating piece through holes, a plurality of inserting holes penetrating through the thickness direction of the transition joint body plate are formed in the position corresponding to the sheet body pins, the sheet body pins can penetrate through the inserting holes corresponding to the sheet body pins and can be inserted into the sheet body locating piece through holes, the sheet body pins and the sheet body locating piece through holes can be matched and installed together, and accordingly the anti-backflow sheet is positioned at the opening of the inner cavity of the connection cover body and is attached to the transition joint body plate, namely the anti-backflow sheet is positioned at the connection position of the transition joint body and the flow guide piece.

In another specific embodiment of the utility model, the outer part of the drainage tube plug is in a tower-shaped step structure, and a plurality of drainage tube plug conical parts are formed on the drainage tube plug, and the radius of one end of each drainage tube plug conical part, which is far away from the connecting cover body, is smaller than that of the other end.

In yet another specific embodiment of the present utility model, the transition piece and the flow guide are all integrally injection molded.

In still another specific embodiment of the present utility model, the material of the anti-backflow sheet is preferably one of rubber, silica gel, TPU or TPE materials.

In a further specific embodiment of the present utility model, the pipe joint is a sampling head, and includes a sampling head body, a pipe plug of the pipe joint, and a liquid outlet sleeve of the pipe joint, where the sampling head body is in a cuboid structure; the pipeline joint plug is formed on the liquid inlet port of the sampling head body and communicated with the liquid inlet port, the pipeline joint liquid outlet sleeve is formed on the liquid outlet port of the sampling head body and communicated with the liquid outlet port, and the pipeline joint liquid outlet sleeve is connected to the transition joint piece.

In a further specific embodiment of the present utility model, a sampling port is formed on the sampling head body, and a sampling rubber sheet into which the medical needle can be inserted is disposed on the sampling port.

In still another specific embodiment of the present utility model, the outside of the pipe joint plug is in a tower-shaped step structure, and a plurality of pipe joint plug conical parts are formed on the pipe joint plug, and the radius of one end of the pipe joint plug conical part far from the sampling head body is smaller than that of the other end.

In yet another specific embodiment of the present utility model, the pipe joint liquid outlet sleeve is tubular, the transition joint further includes a transition joint inner liner and a transition joint clamping sleeve formed on a side surface of the transition joint main body plate facing the pipe joint, the transition joint inner liner and the transition joint clamping sleeve are both in a ring-shaped structure, and a transition joint through hole penetrating to the transition joint main body plate is formed inside the transition joint inner liner along an axis thereof; a transition joint piece clamping cavity is formed between the transition joint piece inner bushing and the transition joint piece clamping sleeve, the transition joint piece clamping cavity is adaptive to the shape of the pipeline joint liquid outlet sleeve, and the pipeline joint liquid outlet sleeve can be fixedly arranged in the transition joint piece clamping cavity, so that the pipeline joint is connected with the transition joint piece.

The technical scheme provided by the utility model has the technical effects that: firstly, because the junction at transition joint spare and water conservancy diversion spare has set up the piece of preventing backflowing of laminating on transition joint spare body board, prevent backflowing the piece and open when interior liquid flows by transition joint spare towards the water conservancy diversion spare and carry out the water conservancy diversion, and prevent backflowing the piece and close at transition joint spare body board by opposite direction pressurization subsides in interior liquid to realize the shutoff to backflowing the liquid, effectively prevent the emergence of liquid backflowing the condition from this, avoid appearing the problem of secondary infection, seal fit is effectual simultaneously, also promoted the security that medical drainage metering box used by a wide margin, protection patient life safety.

Drawings

FIG. 1 is an exploded view of a three-dimensional structure of an embodiment of the present utility model;

FIG. 2 is a cross-sectional view of the transition piece and the baffle of the embodiment of FIG. 1.

In the figure: 1. the device comprises a pipeline joint, a sampling head body, a sampling port, a sampling rubber sheet, a pipeline joint pipe plug taper part, a pipeline joint liquid outlet sleeve and a pipeline joint liquid outlet sleeve, wherein the pipeline joint is 11; 2. transition joint piece, 21, transition joint piece main body plate, 211, main body plate matching sleeve, 212, sheet body pin, 22, transition joint piece inner bushing, 221, transition joint piece through hole, 23, transition joint piece clamping sleeve, 24, transition joint piece clamping cavity; 3. the guide piece, 31, the connecting cover body, 311, the connecting cover body inner cavity, 312, the connecting cover body matching sleeve, 313, the connecting cover body curved neck part 314, a sheet positioning piece, 3141, a sheet positioning piece through hole, 32, a drainage tube plug, 321 and a drainage tube plug conical part; 4. a backflow preventing sheet 41, an insertion hole; 5. a liquid inlet conduit; 6. a drainage tube.

Detailed Description

In order that the technical spirit and advantages of the present utility model may be more clearly understood, reference will now be made in detail to the following examples, which are not intended to limit the scope of the utility model, but rather are merely equivalent in form to the present utility model.

In the following description, all concepts related to the directions or azimuths of up, down, left, right, front and rear are based on the position state of fig. 1, and thus should not be construed as a specific limitation on the technical solution provided by the present utility model.

Referring to fig. 1 in combination with fig. 2, there is shown an anti-reflux catheter connector for a medical drainage metering box, comprising a tubing connector 1 for connecting with a tube for outputting urine or drainage fluid from the chest; also shown is a transition fitting 2 connected to and in communication with the left end of the pipe fitting 1, and the transition fitting 2 has a transition fitting body plate 21; the flow guiding piece 3 is fixedly connected to the left end part of the transition joint piece 2 and is communicated with the left end part, the flow guiding piece 3 comprises a connecting cover body 31 and a flow guiding tube plug 32, the connecting cover body 31 is provided with an opening facing the transition joint piece 2, a connecting cover body inner cavity 311 is formed in the connecting cover body 31, the transition joint piece main body plate 21 is fixedly connected to the right end opening of the connecting cover body 31, and the flow guiding tube plug 32 is formed on the connecting cover body 31 and is communicated with the connecting cover body inner cavity 311; the anti-backflow sheet 4 is further shown to be movably positioned at the right end opening of the inner cavity 311 of the connection housing and attached to the main body plate 21 of the transition joint, and the anti-backflow sheet 4 is moved toward the inner cavity 311 of the connection housing to be opened when the internal liquid flows from the transition joint 2 toward the guide 3, and the anti-backflow sheet 4 is blocked by the main body plate 21 of the transition joint when the internal liquid is pressurized in the opposite direction because the anti-backflow sheet 4 is attached to the main body plate 21 of the transition joint, so that the anti-backflow sheet 4 cannot be opened and closed toward the main body plate 21 of the transition joint, thereby preventing the urine from flowing backwards.

In this embodiment, the transition joint body plate 21 has a shield cover plate shape, a body plate mating sleeve 211 is protruded on a surface of the transition joint body plate 21 facing the connection cover 31, a connection cover body mating sleeve 312 is formed at a position of the connection cover 31 corresponding to an end edge of the transition joint body plate 21, and a contour of the connection cover body mating sleeve 312 is matched with a contour shape of the body plate mating sleeve 211; the outline of the connecting cover body matching sleeve 312 and the outline of the main body plate matching sleeve 211 are all shield-type, 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 in an ultrasonic welding mode, so that the transition joint piece 2 and the guide piece 3 are fixedly connected; of course, the main body board matching sleeve 211 and the connecting cover body matching sleeve 312 can be fixed by other manners, and will not be described in detail herein.

Further, an end portion of the connecting cover 31, which is close to the drain plug 32, is formed with a connecting cover curved neck portion 313, and a plurality of sheet positioning members 314 are formed on an inner wall of the connecting cover curved neck portion 313, as shown in fig. 1, the connecting cover curved neck portion 313 is formed at a top portion of the connecting cover 31 and is arranged in an inclined arc shape, and as shown in fig. 2, the connecting cover curved neck portion 313 is arranged so that the connecting cover inner cavity 311 is formed in a shape that an upper end portion is inwardly contracted, and the connecting cover inner cavity 311 is formed in a shape that an upper portion is narrow and a lower end is wide, so that the production and the manufacturing of the sheet positioning members 314 can be facilitated; in addition, the number of the sheet body positioning pieces 314 is two, the two sheet body positioning pieces 314 are arranged in the connecting cover body inner cavity 311, the two sheet body positioning pieces 314 extend from the connecting cover body bent neck 313 to the opening of the connecting cover body 31, and the sheet body positioning pieces 314 are tubular and internally form a sheet body positioning piece through hole 3141 formed along the axis of the sheet body positioning pieces; two sheet pins 212 are formed on one side surface of the transition joint body plate 21 facing the connection housing 31 and at positions corresponding to the two sheet positioning members 314, the two sheet pins 212 are extended toward the respective corresponding sheet positioning members 314 and can be inserted into the sheet positioning member through holes 3141, and insertion holes 41 penetrating through the thickness direction of the transition joint body plate 4 are formed on the transition joint body plate 4 and at positions corresponding to the two sheet pins 212, the two sheet pins 212 can pass through the respective corresponding insertion holes 41 and are inserted into the sheet positioning member through holes 3141, and the two sheet pins 212 can be matched with the sheet positioning member through holes 3141 to be mounted together, so that the anti-backflow sheet 4 is positioned at the opening of the inner cavity 311 of the connection housing and is adhered to the transition joint body plate 21, i.e. the anti-backflow sheet 4 is positioned and fixed at the connection position of the transition joint 2 and the flow guide 3.

In this embodiment, the outside of the drain plug 32 has a tower-shaped step structure, and a plurality of drain plug tapered portions 321 are formed on the drain plug 32, and a radius of one end of the drain plug tapered portion 321, which is far away from the connection cover 31, is smaller than that of the other end; through setting up aforesaid drainage tube stopper toper portion 321 can make the cup joint of drainage tube stopper 32 and pipeline more convenient to it is more firm to combine after cup jointing, can not appear the condition that drainage tube stopper 32 breaks away from with the pipeline body.

Preferably, the transition joint 2 and the flow guide 3 are all integrally injection molded.

Preferably, the material of the anti-backflow sheet 4 is preferably one of rubber, silica gel, TPU or TPE material; the anti-backflow sheet 4 has elasticity, can be conveniently opened when the internal liquid flows from the transition joint part 2 to the guide part 3, and can be tightly attached to the transition joint part main body plate 21 when the internal liquid is pressurized in the opposite direction, and plays a role in preventing backflow.

With continued reference to fig. 1, the pipe joint 1 is a sampling head, and includes a sampling head body 11, a pipe joint plug 12, and a pipe joint liquid outlet sleeve 13; the pipe plug 12 is connected to and communicated with the liquid inlet of the sampling head body 11, the liquid outlet sleeve 13 is connected to and communicated with the liquid outlet of the sampling head body 11, and the liquid outlet sleeve 13 is connected to the transition joint 2.

In this embodiment, a sampling port 111 is formed on the sampling head body 11, and a sampling rubber sheet 112 into which a medical needle can be inserted is disposed on the sampling port 111; the medical staff can insert the needle of the medical injector into the sampling head body 11 through the sampling rubber sheet 112 and draw out urine or thoracic drainage liquid flowing through the inside of the sampling head body 11 for subsequent examination.

It should be noted that, in this embodiment, the above-mentioned tube connector 1 is a sampling head, and a healthcare worker can collect urine or thoracic drainage liquid flowing through the tube connector 1 for corresponding detection; of course, the pipe joint 1 may also be a joint member which has other uses and can be connected to a pipe, such as a flow adjusting joint, etc., and the form and the structure of the pipe joint 1 can be flexibly changed according to the actual use requirement, which will not be repeated here.

Further, the outside of the pipe joint plug 12 has a tower-type step 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, which is far away from the sampling head body 11, is smaller than that of the other end; likewise, the drain plug taper 321 can ensure the convenience and firmness of the sleeving of the drain plug 32 and the pipe.

Further, the pipe joint liquid outlet sleeve 13 is tubular, the transition joint 2 further includes a transition joint inner liner 22 and a transition joint clamping sleeve 23 formed on the right side surface of the transition joint main body plate 21, the transition joint inner liner 22 and the transition joint clamping sleeve 23 are both in a ring-shaped structure, and a transition joint through hole 221 penetrating to the transition joint main body plate 21 is formed inside the transition joint inner liner 22 along the axis thereof; a transition joint piece clamping cavity 24 is formed between the transition joint piece inner lining 22 and the transition joint piece clamping sleeve 23, the shape of the transition joint piece clamping cavity 24 is adapted to that of the pipeline joint liquid outlet sleeve 13, the pipeline joint liquid outlet sleeve 13 can be installed in the transition joint piece clamping cavity 24, and the pipeline joint liquid outlet sleeve 13 can be firmly connected with the transition joint piece inner lining 22 and the transition joint piece clamping sleeve 23 in a preferable adhesive mode, so that the connection and fixation of the pipeline joint 1 and the transition joint piece 2 are realized.

Referring to fig. 1 and 2, the present inventors briefly describe the working principle of the present utility model: fig. 1 also shows a liquid inlet conduit 5 and a drainage tube 6, wherein one end of the liquid inlet conduit 5 is connected to a human body and can collect urine or drainage liquid in the chest cavity of the human body, while the other end is connected to a pipeline joint plug 12, one end of the drainage tube 6 is connected to the drainage tube plug, while the other end is connected to the liquid accumulation box body of the medical drainage metering box, and the connection mode of the liquid inlet conduit 5 and the drainage tube 6 in the medical drainage metering box can be referred to the patent document with publication number CN210963556U filed before the inventor; when in installation, firstly, the pipeline joint liquid outlet sleeve 13 of the pipeline joint 1 is inserted into the transition joint part clamping cavity 24, the clamping and fixing of the pipeline joint 1 and the transition joint part 2 can be realized in an adhesive mode, then the anti-backflow sheet 4 is positioned and arranged at the opening of the connecting cover body 31, the transition joint part 2 is sleeved on the flow guide part 3, and meanwhile, the plurality of sheet body pins 212 penetrate through the insertion holes 41 on the anti-backflow sheet 4 and are matched and installed in the sheet body positioning part through holes 3141, so that the clamping and fixing of the transition joint part 2, the flow guide part 3 and the anti-backflow sheet 4 are realized; when the urine or other drainage liquid is used, human urine or other drainage liquid enters the pipeline connector 1 along the liquid inlet pipe 5, enters the transition connector 2 through the transition connector through hole 221 and then flows onto the backflow preventing sheet 4, the backflow preventing sheet 4 moves towards the inner cavity 311 of the connecting cover body under pressure and opens, the transition connector through hole 221 is communicated with the inner cavity 311 of the connecting cover body, so that the urine or other urine flows into the inner cavity 311 of the connecting cover body through the transition connector through hole 221 and flows into the liquid collecting box body of the medical drainage metering box through the drainage pipe plug 32 and the drainage pipe 6, and after the drainage of the urine or thoracic cavity drainage liquid is finished, the backflow preventing sheet 4 is attached to the main body plate 21 of the transition connector due to the fact that no liquid pressure exists; when the liquid accumulation box body of the medical drainage metering box is full of liquid and liquid flows back into the inner cavity 311 of the connecting cover body, the anti-backflow sheet 4 is tightly propped against the main body plate 21 of the transition joint piece due to the pressure of the connecting cover body 31 towards the main body plate 21 of the transition joint piece on the liquid, the anti-backflow sheet 4 cannot be opened, the through hole 221 of the transition joint piece is separated from the inner cavity 311 of the connecting cover body by the anti-backflow sheet 4, so that the liquid flowing back cannot enter the pipeline joint 1 and the liquid inlet guide tube 5, the occurrence of the conditions that the liquid flowing back causes catheterization, drainage failure or the liquid enters a human body and the like is avoided, and the safety is greatly improved.

In summary, the technical scheme provided by the utility model overcomes the defects in the prior art, successfully completes the task of the utility model, and faithfully honors the technical effects carried by the applicant in the technical effect column above.

Claims

1. The utility model provides a medical drainage metering box is with preventing back flow pipe joint which characterized in that includes: a pipeline joint (1) for connecting with a pipeline for outputting human urine or thoracic cavity metering liquid; a transition piece (2) connected to and in communication with the pipe joint (1), the transition piece (2) having a transition piece body plate (21); the guide piece (3) is fixedly connected to one end part of the transition joint piece (2) far away from the pipeline joint (1), the guide piece (3) comprises a connecting cover body (31) and a drainage pipe plug (32), the connecting cover body (31) is provided with an opening towards the transition joint piece (2), the inside of the connecting cover body (31) is formed into a connecting cover body cavity (311), the transition joint piece main body plate (21) is fixedly connected to the opening of the connecting cover body (31), and the drainage pipe plug (32) is formed on the connecting cover body (31) and is communicated with the connecting cover body cavity (311); the anti-backflow sheet (4) is movably positioned at the opening of the inner cavity (311) of the connecting cover body and is attached to the main body plate (21) of the transition joint piece, the anti-backflow sheet (4) moves towards the inner cavity (311) of the connecting cover body to be opened when the internal liquid flows from the transition joint piece (2) towards the guide piece (3), and the anti-backflow sheet (4) is closed when the internal liquid is pressurized in the opposite direction.

2. The backflow prevention catheter joint for a medical drainage metering box according to claim 1, wherein a main body plate matching sleeve (211) is convexly arranged on the surface of one side of the transition joint piece main body plate (21) facing the connecting cover body (31), a connecting cover body matching sleeve (312) is formed at the edge position of one end part of the connecting cover body (31) corresponding to the transition joint piece main body plate (21), the outline of the connecting cover body matching sleeve (312) is matched with the outline shape 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 fixedly connected together, so that the installation of the transition joint piece (2) and the diversion piece (3) is realized.

3. The anti-backflow catheter joint for a medical drainage metering box according to claim 1, wherein one end part of the connecting cover body (31) close to the drainage tube plug (32) is provided with a connecting cover body bent neck part (313), the inner wall of the connecting cover body bent neck part (313) is provided with a plurality of sheet body positioning pieces (314), the sheet body positioning pieces (314) are arranged in the inner cavity (311) of the connecting cover body, the plurality of sheet body positioning pieces (314) extend from the connecting cover body bent neck part (313) to an opening part of the connecting cover body (31), and the sheet body positioning pieces (314) are tubular and internally provided with sheet body positioning piece through holes (3141) formed along the axis of the sheet body positioning pieces; and a plurality of sheet pins (212) are formed on one side surface of the transition joint body plate (21) facing the connecting cover body (31) and at positions corresponding to the plurality of sheet positioning pieces (314), the plurality of sheet pins (212) extend towards the sheet positioning pieces (314) corresponding to the sheet pins and can be inserted into the sheet positioning piece through holes (3141), a plurality of inserting holes (41) penetrating through the thickness direction of the transition joint body plate (4) and at positions corresponding to the plurality of sheet pins (212) are formed on the transition joint body plate (4), the plurality of sheet pins (212) can penetrate through the inserting holes (41) corresponding to the sheet pins and are inserted into the sheet positioning piece through holes (3141), and the plurality of sheet pins (212) can be matched with the sheet positioning piece through holes (3141) together, so that the transition joint body plate (4) is positioned at the opening of the connecting cover body cavity (311) and is attached to the transition joint body plate (21), and the transition joint body plate (4) is arranged at the position where the transition joint body plate (3) is connected with the transition joint body plate (3).

4. The backflow prevention catheter joint for the medical drainage metering box according to claim 1, wherein the outer portion of the drainage tube plug (32) is of a tower-shaped step structure, a plurality of drainage tube plug conical portions (321) are formed on the drainage tube plug (32), and the radius of one end, far away from the connecting cover body (31), of each drainage tube plug conical portion (321) is smaller than that of the other end.

5. The anti-backflow catheter connector for the medical drainage metering box according to claim 1, wherein the transition connector piece (2) and the flow guiding piece (3) are integrally injection molded.

6. The anti-backflow catheter connector for the medical drainage metering box according to claim 1, wherein the anti-backflow sheet (4) is preferably made of one of rubber, silica gel, TPU or TPE.

7. The anti-backflow catheter connector for the medical drainage metering box according to claim 1, wherein the pipeline connector (1) is a sampling head and comprises a sampling head body (11), a pipeline connector plug (12) and a pipeline connector liquid outlet sleeve (13), and the sampling head body (11) is in a cuboid structure; the pipeline joint plug (12) is formed on the liquid inlet port of the sampling head body (11) and is communicated with the liquid inlet port, the pipeline joint liquid outlet sleeve (13) is formed on the liquid outlet port of the sampling head body (11) and is communicated with the liquid outlet port, and the pipeline joint liquid outlet sleeve (13) is connected to the transition joint piece (2).

8. The anti-backflow catheter connector for the medical drainage metering box according to claim 7, wherein a sampling port (111) is formed in the sampling head body (11), and a sampling rubber sheet (112) into which a medical needle can be inserted is arranged on the sampling port (111).

9. The anti-backflow catheter connector for a medical drainage metering box according to claim 7, wherein the outside of the pipeline connector plug (12) is of a tower-shaped step structure, a plurality of pipeline connector plug conical parts (121) are formed on the pipeline connector plug (12), and one end of the pipeline connector plug conical parts (121) far away from the sampling head body (11) is smaller in radius than the other end.

10. The backflow prevention catheter joint for a medical drainage metering box according to claim 7, wherein the pipeline joint liquid outlet sleeve (13) is tubular, the transition joint part (2) further comprises a transition joint part inner bushing (22) and a transition joint part clamping sleeve (23) which are formed on the surface of one side of the transition joint part main body plate (21) facing the pipeline joint (1), the transition joint part inner bushing (22) and the transition joint part clamping sleeve (23) are of annular structures, and a transition joint part through hole (221) penetrating into the transition joint part main body plate (21) is formed inside the transition joint part inner bushing (22) along the axis of the transition joint part inner bushing; a transition joint piece clamping cavity (24) is formed between the transition joint piece inner bushing (22) and the transition joint piece clamping sleeve (23), the transition joint piece clamping cavity (24) is adaptive to the shape of the pipeline joint liquid outlet sleeve (13), and the pipeline joint liquid outlet sleeve (13) can be fixedly installed in the transition joint piece clamping cavity (24), so that the connection between the pipeline joint (1) and the transition joint piece (2) is realized.