Catheter and method of manufacturing the same, endoscope kit

Abstract

This application provides a catheter and its manufacturing method, as well as an endoscope kit, relating to the field of medical device technology. There is no adhesive joint between the first and second tubes, avoiding the risk of separation during repeated bending and alternating high and low temperature environments, effectively improving the structural stability and service life of the tubes. This design eliminates multiple processing steps such as gluing, drying, curing, and alignment, resulting in a simple overall structure, simplified product molding process, and enabling high-volume, high-efficiency manufacturing, thus improving production efficiency. The installation space not only accommodates the connector and endoscope assembly but also provides ample operational clearance. Furthermore, the second tube has sufficient length to prevent structural interference caused by its proximity to the endoscope's operating handle, thus preventing interference with the assembly and alignment of the connector and endoscope.

Description

Technical Field

[0001] This application relates to the field of medical device technology, and in particular to a catheter and its manufacturing method, and an endoscope kit. Background Technology

[0002] As a key component for medical devices inserted into the human body, catheters feature a sealed end structure that isolates them from the internal environment during medical procedures. This prevents contamination of patient cavities or surgical areas by particles and impurities generated by internal components. Furthermore, the sealed structure facilitates overall cleaning, disinfection, and sterilization, effectively reducing the risk of cross-infection and ensuring safety and structural stability during diagnosis and treatment. To achieve multiple functions, catheters often require two or more different tubes for independently delivering media, inserting medical devices, etc.

[0003] However, existing conduits typically use adhesives to bond and fix the outer walls of two pipes together, keeping them side by side. When the pipeline is subjected to repeated bending, pulling, and environmental changes during use, the adhesive is very prone to failure, causing the two pipes to peel off and separate along the bonding interface, resulting in pipeline structural separation failure. Summary of the Invention

[0004] The purpose of this application is to provide a catheter and its manufacturing method, as well as an endoscope kit, to solve the aforementioned technical problems existing in the prior art.

[0005] In a first aspect, embodiments of this application provide a method for manufacturing a catheter. The method includes integrally molding a tubular component, the tubular component including a first tubular body and a second tubular body arranged side by side, cutting off a portion of the first tubular body at its proximal end to form a first installation space between the proximal ends of the first tubular body and the second tubular body, installing a connector seat in the first installation space and connecting it to the proximal end of the first tubular body.

[0006] Secondly, embodiments of this application also provide a conduit, which is manufactured by the aforementioned manufacturing method. The conduit includes a fitting and a connector. The fitting includes a first tube body and a second tube body arranged side by side. The first tube body and the second tube body are integrally formed. Relative to the proximal end face of the first tube body, the second tube body extends toward the distal end away from the first tube body and forms a first installation space between the proximal ends of the first tube body and the second tube body. The connector is installed in the first installation space and connected to the proximal end of the first tube body.

[0007] Thirdly, embodiments of this application also provide an endoscope kit, including the aforementioned catheter and endoscope.

[0008] The technical solution adopted in this application achieves the following beneficial effects: This application uses an integral molding process to manufacture the pipe fittings. Compared with the existing double-pipe structure formed by adhesive bonding, there is no adhesive joint between the first and second pipe bodies. This avoids the risk of failure due to the two pipe bodies peeling off under conditions such as repeated bending and alternating high and low temperature environments, effectively improving the structural stability and service life of the pipe fittings. This design eliminates multiple processing steps such as applying glue, drying glue, curing, and alignment bonding, resulting in a simple overall structure, simplifying the product molding process, enabling mass production at high efficiency, and improving production efficiency.

[0009] Compared to existing technologies, the embodiments of this application involve partially cutting the proximal section of the first tube body on a one-piece molded fitting, forming a first installation space axially between the first and second tube bodies. This installation space not only accommodates the connector and endoscope assembly but also provides ample operational clearance. Furthermore, the second tube body has sufficient length to prevent structural interference caused by excessive proximity between the second tube body and the endoscope operating handle, thus preventing interference with the assembly alignment of the connector and endoscope. This reduces the overall assembly difficulty and improves assembly accuracy and the smoothness of clinical operation. Attached Figure Description

[0010] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0011] Figure 1 This is a schematic flowchart illustrating a manufacturing method in an exemplary embodiment of this application; Figure 2 This is a schematic diagram of the pipe fitting structure shown in an exemplary embodiment of this application; Figure 3 This is a schematic diagram of the structure of a catheter shown in an exemplary embodiment of this application; Figure 4 This is a schematic flowchart illustrating a manufacturing method after integral molding of a tubular component, as shown in an exemplary embodiment of this application. Figure 5 This is a schematic flowchart illustrating a manufacturing method after integral molding of a tubular component, as shown in another exemplary embodiment of this application. Figure 6 This is a schematic diagram of the structure of an endoscope kit shown in an exemplary embodiment of this application; Figure 7 This is a schematic flowchart illustrating a manufacturing method after a tubular component is integrally formed, as shown in an exemplary embodiment of this application. Figure 8 This is a schematic diagram illustrating the structure of another pipe fitting, as shown in an exemplary embodiment of this application; Figure 9 This is an exemplary embodiment of the present application illustrating another type of duct explosion diagram; Figure 10 This is a schematic diagram of another catheter structure shown in an exemplary embodiment of this application; Figure 11 This is a schematic flowchart illustrating a manufacturing method prior to mounting the transparent head end into the second mounting space, as shown in an exemplary embodiment of this application. Figure 12 This is an exploded view of the transparent tip, as illustrated in an exemplary embodiment of this application. Figure 13 This is a schematic diagram of the structure of an endoscope kit shown in an exemplary embodiment of this application.

[0012] In the diagram: 1. Conduit; 100. Fitting; 110. First tube body; 111. Connecting section; 112. Separating section; 113. Cut surface; 120. Second tube body; 121. Control component; 122. Large air vent; 130. First installation space; 140. Second installation space; 150. Connector seat; 200. Suction connector; 300. Transparent tip; 310. Transparent membrane; 320. Connecting tube; 321. First section; 322. Second section; 330. Fixing component; 2. Endoscope kit; 3. Endoscope; 4. Suction valve. Detailed Implementation

[0013] To make the objectives, technical solutions, and advantages of this application clearer, the technical solutions of this application will be described in detail below. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. Based on the embodiments in this application, all other implementation methods obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0014] The terms "first," "second," etc., used in the specification and claims of this application are used to distinguish similar objects and not to describe a specific order or sequence. It should be understood that such use of data can be interchanged where appropriate so that embodiments of this application can be implemented in orders other than those shown in the illustrations or descriptions, and the objects distinguished by "first," "second," etc., are generally of the same class, without limiting the number of objects; for example, the first object can be one or more. Furthermore, in the specification and claims, "and / or" indicates at least one of the connected objects, and the character " / " generally indicates that the preceding and following objects are in an "or" relationship.

[0015] Please see Figures 1 to 3 The embodiments of this application provide a method for manufacturing a catheter, the method comprising: Step S110: The pipe fitting 100 is manufactured by integral molding. The pipe fitting 100 includes a first pipe body 110 and a second pipe body 120 arranged in parallel.

[0016] Please see Figure 1 The fitting 100 is manufactured using an integrated molding process. The fitting 100 comprises a first tube body 110 and a second tube body 120, arranged side-by-side. This allows medical personnel to perform more complex functions, such as inserting medical devices into the first tube body 110 and injecting or draining media into the second tube body 120. Compared to existing double-tube structures bonded with adhesive, there is no adhesive joint between the first tube body 110 and the second tube body 120. This avoids the risk of separation of the two tube bodies under repeated bending, alternating high and low temperature environments, and other conditions, effectively improving the structural stability and service life of the fitting 100. This design eliminates multiple processing steps such as applying adhesive, drying adhesive, curing, and alignment, resulting in a simpler overall structure. It simplifies the molding process of the fitting 100, enabling mass production and improving overall efficiency.

[0017] More specifically, the pipe fitting 100 is manufactured through integral extrusion molding. For example, molten plastic is continuously and uniformly extruded from a fixed-section die head of an extruder, cooled and shaped to form a first pipe body 110 and a second pipe body 120 arranged side by side, which are a continuous structure integrally formed. The embodiments of this application can rely on extrusion molding, which can efficiently and quickly produce continuous profiles of equal cross-section and infinite length, with low manufacturing cost and higher manufacturing efficiency.

[0018] Step S120: At the proximal end of the first tube 110, a portion of the first tube 110 is cut off to form a first installation space 130 between the proximal end of the first tube 110 and the proximal end of the second tube 120.

[0019] At the proximal end of the first tube body 110, a portion of the tube segment at the proximal end of the first tube body 110 is removed by a cutting or punching process. Specifically, in some cases, a cutting die is made according to the required cutting location and the structure of the first tube body 110. For example, a cutting die is made according to the required cutting structure, and the proximal portion of the first tube body 110 is directly cut using the cutting die. Alternatively, in other cases, the tube segment is cut circumferentially around the first tube body 110 at a predetermined axial position at the proximal end of the first tube body 110, and then this portion of the tube segment is separated from and removed from the second tube body 120. After the cutting in this embodiment, the proximal portion of the first tube body 110 is exposed, causing the proximal end face of the first tube body 110 and the proximal end face of the second tube body 120 to be misaligned axially, forming a first mounting space 130 between them.

[0020] In this embodiment, the proximal section of the first tube body 110 is partially cut on the integrally formed tube 100, forming a first installation space 130 axially between the first tube body 110 and the second tube body 120. This installation space not only accommodates the assembly of the connector seat 150 and the endoscope 3, but also provides sufficient operational clearance area. In addition, the second tube body 120 has sufficient length to avoid structural interference caused by the close proximity of the second tube body 120 and the operating handle of the endoscope 3, preventing interference with the assembly alignment between the connector seat 150 and the endoscope 3. This reduces the overall assembly difficulty and improves assembly accuracy and the smoothness of clinical operation.

[0021] Step S130: Install the connector seat 150 in the first installation space 130 and connect it to the proximal end of the first tube body 110.

[0022] Please see Figure 3 The connector 150 is installed within the first installation space 130 and connected and fixed to the proximal end of the first tube 110. Specifically, the outer peripheral surface of the connector 150 mates with the inner wall surface of the first tube 110, and the proximal end face of the connector 150 is positioned and connected to the proximal end face of the first tube 110. The connection method can be bonding, welding, or interference fit.

[0023] In the embodiments of this application, please refer to Figure 3 After the pipe fitting 100 is integrally formed, the first pipe body 110 includes a connecting section 111 and a separating section 112 arranged from its distal end to its proximal end. The separating section 112 is cut at the connection between it and the second pipe body 120 so that the separating section 112 is relatively independent from the second pipe body 120, while keeping the connecting section 111 and the second pipe body 120 connected.

[0024] Cut along the radial connection between the separating section 112 and the second tube 120, severing the integrally formed radial connection between the separating section 112 and the second tube 120. This allows the separating section 112 and the second tube 120 to be radially freed from constraint, enabling them to move relatively independently. By separating the connection between the separating section 112 and the second tube 120, this arrangement allows the separating section 112 to be freely manipulated, preventing the second tube 120 from interfering with the installation or use of the sheath seat, thus facilitating use by medical personnel.

[0025] In addition, this arrangement can keep the connecting section 111 connected to the second tube body 120, retain the structural advantages and coaxiality accuracy brought by integral molding, and maintain the overall rigidity and reliability of the double-layer tube in the main body of the conduit 1.

[0026] Preferably, the length of the connecting section 111 is 3 to 5 times the length of the separating section 112, for example, 3, 4, or 5 times. The length of the separating section 112 should not be too short or too long relative to the connecting section 111. If the separating section 112 is too short, it will result in insufficient assembly space for the connector seat 150 and make assembly prone to structural interference. If the separating section 112 is too long, it will compress the length of the connecting section 111, reduce the connection area of ​​the double-pipe joint region, and result in insufficient structural rigidity of the pipe fitting 100, making it prone to bending and peeling failure. This ratio range allows for sufficient assembly operation space for the separating section 112 while ensuring the connection strength and extendable length of the double pipes, balancing assembly convenience and structural reliability.

[0027] Step S210: Cut along the radial direction of the first tube body 110 at the connection between the separation section 112 and a portion of the tube near the end of the first tube body 110.

[0028] The position of the proximal end face of the separation section 112 is pre-confirmed, and cutting is performed between the separation section 112 and the proximal end of the first pipe body 110 to be cut along the radial direction of the first pipe body 110. This setting can determine the axial position boundary of the cut and improve the cutting accuracy.

[0029] Step S220: Cut along the proximal end face of the first tube 110 to the distal end face of the separation section 112 at the connection between the first tube 110 and the second tube 120.

[0030] Cut along the radial connection between the first pipe body 110 and the second pipe body 120 from the proximal end face of the first pipe body 110 to the distal end face of the separation section 112, i.e. along the axial direction, to cut off the connecting material between a portion of the proximal end of the first pipe body 110 and the second pipe body 120.

[0031] In this embodiment, the axial boundary of the pipe segment to be removed is first determined by radial cutting, and then the cutting length is precisely controlled to avoid cutting too deep or too shallow and damaging the separation segment 112 or the second pipe body 120 that needs to be retained. After radial cutting is completed, axial cutting is performed. At this time, the boundary of the pipe segment to be removed has been determined, the cutting force can be applied stably, the cut surface is neatly separated along the preset boundary, the cut surface has high flatness, and the subsequent trimming process is reduced.

[0032] Alternatively, in another implementation, please refer to Figure 5 The manufacturing method also includes: Step S310: Cut along the proximal end face of the first tube 110 to the distal end face of the separation section 112 at the connection between the first tube 110 and the second tube 120, while forming a cutting surface 113 on the outer surface of the first tube 110. The cutting surface 113 is a plane.

[0033] Using the proximal end face of the first tube 110 as the starting cutting reference and the distal end face of the separated section 112 as the cutting termination position, an axial sectioning process is performed along the radial joint interface where the two tubes are thermally fused together. For example, if the first tube 110 and the second tube 120 are connected, the connecting portion is cut off to form a cutting surface 113. This configuration simultaneously separates the first tube 110 and the second tube 120, while simultaneously forming a planar cutting surface 113 on the outer surface of the first tube 110 through cutting or milling.

[0034] Step S320: Fix the first tube body 110 through the cutting surface 113, and cut along the radial direction of the first tube body 110 at the connection between the separation section 112 and a portion of the tube near the end of the first tube body 110.

[0035] Using the planar cutting surface 113 as a positioning reference surface, the first tube 110 is fixed to the fixture or worktable, and then cut along the radial direction of the first tube 110 at the connection between the separated section 112 and the section of tube to be cut.

[0036] In this embodiment, the formed cutting surface 113 provides a positioning and clamping reference surface for subsequent radial cutting. Compared to a circular outer surface, the planar cutting surface 113 can form surface contact with the fixture, avoiding the rolling and deflection that easily occur when clamping a circular surface. This significantly improves the positioning accuracy and clamping stability of radial cutting, ensures a flat cut end face, clear boundaries between the separated section 112 and the retained portion, and reduces cutting deviations caused by clamping instability.

[0037] Furthermore, since the first tube 110 and the second tube 120 have been partially separated, the separated sections of the first tube 110 and the second tube 120 can be naturally or artificially slightly forked to both sides, forming a mutually restraining double-tube support structure. The first tube 110 and the second tube 120 abut against each other laterally, providing stable support force and effectively limiting the problems of circumferential rolling, lateral displacement, and vertical swaying of a single tube. In subsequent processing steps such as clamping and fixing, end cutting, and assembly of the connector seat 150, the forked double-tube structure does not require additional complex restraining fixtures, allowing the tube 100 to maintain a stable posture and avoiding the defects of slippage, skewness, and twisting deformation that are easily caused by a single circular tube under force.

[0038] In the embodiments of this application, please refer to Figure 6The manufacturing method further includes: installing a suction connector 200 at the proximal end of the second tube 120. The suction connector 200 is also provided with a connecting structure for connecting the operating handle of the endoscope 3. The suction connector 200 is installed at the proximal end of the second tube 120 and has a fluid channel inside, which can be connected to an external negative pressure suction device. The suction connector 200 also has an atmospheric vent hole, which can connect to the fluid channel. Medical staff can change the airflow rate of outside air into the fluid channel by adjusting the opening of the atmospheric vent hole. As the airflow gradually decreases, the negative pressure intensity inside the fluid channel increases accordingly, and the suction force inside the tube 100 increases simultaneously, which can improve the suction efficiency of secretions. Conversely, when the airflow increases, the negative pressure inside the tube 100 is diluted and reduced by the external airflow, and the suction force weakens, which makes it easier for medical staff to flexibly adjust the negative pressure suction force to adapt to different clinical scenarios for sputum suction and effusion drainage.

[0039] The suction connector 200 is equipped with a connecting structure, which can adopt various structural forms such as snap-fit, thread, or Luer connector to achieve the installation and mating between the suction connector 200 and the operating handle of the endoscope 3. Furthermore, the connecting structure can be a snap-fit, which can connect to the suction valve 4 on the operating handle. This design reliably limits the suction connector 200 to the preset assembly position, preventing loosening or displacement during use. In addition, this design ensures that the operating area of ​​the suction connector 200 is consistent with the original operating position of the suction valve 4 on the endoscope 3, allowing medical staff to perform negative pressure control operations without changing their operating habits, making operation convenient and effectively reducing the risk of clinical misoperation.

[0040] Preferably, after a portion of the first tube body 110 is removed, the second tube body 120 extends distally from the first tube body 110 relative to its proximal end face to form an extension section. This extension section provides sufficient axial interface space for the connection between the connector 150 and the endoscope 3 operating handle, preventing structural interference caused by excessive proximity between the second tube body 120 and the endoscope 3 operating handle, and preventing interference with the assembly alignment of the connector 150 and the endoscope 3.

[0041] The extension section is 1.5 to 3 times the length of the endoscope 3's operating handle, for example, 1.5, 2, or 3 times. If the extension section is too short, the connection area between the connector 150 and the second tube 120 will be insufficient, making it difficult to guarantee connection strength and sealing. Furthermore, the installation space for the endoscope 3's operating handle will be limited, making it prone to interference with the connector 150. If the extension section is too long, it will increase the overall axial dimension of the catheter 1, making it difficult for the operator to control. This application uses an extension section that is 1.5 to 3 times the length of the operating handle, ensuring both the secure installation and sealing of the connector 150, while providing ample operating space for the operator to hold the proximal end of the catheter 1 and connect and disconnect the operating handle, thus improving the convenience of clinical use and the smoothness of assembly operations.

[0042] In the embodiments of this application, please refer to Figure 7 After the pipe fitting 100 is manufactured by integral molding, it also includes: Step S410: At the distal end of the first tube 110, a portion of the first tube 110 is cut off to form a second installation space 140 between the distal end of the first tube 110 and the distal end of the second tube 120.

[0043] Please see Figure 8 At the distal end of the first pipe body 110, a section of the distal end of the first pipe body 110 is removed by a cutting process, protruding the distal section of the second pipe body 120. This causes the distal end face of the first pipe body 110 and the distal end face of the second pipe body 120 to be misaligned in the axial direction, forming a second installation space 140 between them.

[0044] Step S420: Install the transparent head end 300 into the second installation space 140 and connect it to the first tube body 110.

[0045] Please see Figure 9 and Figure 10 The pre-assembled transparent end 300 is installed in the second installation space 140, and the transparent end 300 is inserted and fixed to the distal end of the first tube 110. The second installation space 140 provides an insertion and installation position for the transparent end 300, and uses the inner wall surface of the first tube 110 and the outer wall surface of the second tube 120 as radial positioning references to ensure the coaxiality of the assembly between the transparent end 300 and the tube body.

[0046] The transparent tip 300, as a pre-assembled module, is installed in the second installation space 140 and inserted into the first tube 110, avoiding the bonding operation of the transparent membrane 310 in the conduit 1's confined space. This arrangement shifts the assembly of the transparent tip 300 from inside the conduit 1 to the outside, significantly reducing assembly difficulty and improving assembly efficiency and product consistency.

[0047] Please see Figure 11 and Figure 12 Before installing the transparent end 300 into the second mounting space 140 and connecting it to the distal end of the first tube body 110, the method further includes: Step S510: Cover the opening of the connecting tube 320 with the transparent film 310 to seal the opening, and wrap the edge of the transparent film 310 around the outer periphery of the connecting tube 320.

[0048] Take the connecting tube 320 and the transparent membrane 310, and cover the opening at the distal end of the first segment 321 of the connecting tube 320 with the transparent membrane 310 to close the opening. The edge portion of the transparent membrane 310 is wrapped around the outer peripheral surface of the connecting tube 320. The transparent membrane 310 can be a sheet-like structure, and after covering the opening, its edge portion extends beyond the edge of the opening and is bent to wrap around the outer peripheral surface of the connecting tube 320.

[0049] Step S520: The connecting tube 320 includes a first segment 321 and a second segment 322 arranged sequentially from its distal end to its proximal end. The fixing member 330 is fitted onto the first segment 321, and the transparent film 310, the connecting tube 320 and the fixing member 330 are sealed and connected to obtain the transparent head end 300.

[0050] Please see Figure 12 The connecting tube 320 is divided into a first section 321 and a second section 322 along the axial direction. A fixing member 330 is fitted onto the outer periphery of the first section 321 from the distal end of the connecting tube 320, and the fixing member 330 presses against the edge portion of the transparent film 310. The transparent film 310, the connecting tube 320, and the fixing member 330 are sealed together to form an independent transparent head end 300 module. The sealing connection can be achieved by bonding or welding.

[0051] At the distal end of the first tube 110, the second segment 322 is inserted into the first tube 110. The first segment 321 of the connecting tube 320 is used to fix the transparent membrane 310, and the second segment 322 is assembled and connected to the main body of the catheter 1. The transparent tip 300 can be manufactured independently; during assembly, only the second segment 322 of the connecting tube 320 needs to be connected to the main body of the catheter 1 to quickly complete the assembly and fixation of the transparent tip 300. This solution eliminates the need for direct application of the transparent membrane 310 to the catheter 1 for coating and sealing, thus avoiding positional interference from other structures of the catheter 1 on the installation of the transparent tip 300, simplifying the assembly process, and significantly reducing the difficulty of assembly operations.

[0052] This application also provides a catheter 1, please refer to... Figure 3The conduit 1 is manufactured by the manufacturing method described above. The conduit 1 includes a fitting 100 and a connector 150. The fitting 100 includes a first tube body 110 and a second tube body 120 arranged side by side. The first tube body 110 and the second tube body 120 are integrally formed. Relative to the proximal end face of the first tube body 110, the second tube body 120 extends toward the distal end away from the first tube body 110 and forms a first installation space 130 between the proximal end of the first tube body 110 and the proximal end of the second tube body 120. The connector 150 is installed in the first installation space 130 and connected to the proximal end of the first tube body 110.

[0053] Compared to existing double-tube structures bonded with adhesive, there is no adhesive joint between the first tube 110 and the second tube 120 in this embodiment. This avoids the risk of the two tubes peeling off after repeated bending and alternating high and low temperature environments, thus improving the structural stability and service life of the tube.

[0054] This application also provides an endoscope kit 2, please refer to... Figure 13 Endoscope kit 2 includes the aforementioned catheter 1 and endoscope 3.

[0055] It should be noted that, in this document, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Unless otherwise specified, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element.

[0056] Furthermore, it should be noted that the scope of the methods and apparatus in the embodiments of this application is not limited to performing functions in the order shown or discussed, but may also include performing functions substantially simultaneously or in the reverse order, depending on the functions involved. For example, the described methods may be performed in a different order than described, and various steps may be added, omitted, or combined. In addition, features described with reference to certain examples may be combined in other examples.

[0057] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application.

Claims

1. A method for manufacturing a catheter, characterized in that, include: The pipe fitting is manufactured by integral molding, and the pipe fitting includes a first pipe body and a second pipe body arranged side by side; At the proximal end of the first tube, a portion of the first tube is cut off to create a first installation space between the proximal ends of the first tube and the second tube. Install the connector in the first installation space and connect it to the proximal end of the first tube.

2. The manufacturing method according to claim 1, characterized in that, After the integral molding of the pipe fitting is completed, the following is also included: The first tube includes a connecting segment and a separating segment arranged from its distal end to its proximal end. The separating segment is cut at the connection between the separating segment and the second tube to make the separating segment relatively independent of the second tube, while keeping the connecting segment and the second tube connected.

3. The manufacturing method according to claim 2, characterized in that, The manufacturing method includes: Cut along the radial direction of the first pipe body at the junction between the separated section and a portion of the pipe body near the proximal end of the first pipe body. Cut along the proximal end face of the first tube to the distal end face of the separated section at the junction between the first tube and the second tube.

4. The manufacturing method according to claim 2, characterized in that, The manufacturing method includes: Cut along the proximal end face of the first tube to the distal end face of the separation section at the connection between the first tube and the second tube, while forming a cutting surface on the outer surface of the first tube, the cutting surface being a plane; The first tube body is fixed by the cutting surface, and a cut is made along the radial direction of the first tube body at the connection between the separated section and a portion of the tube body near the proximal end.

5. The manufacturing method according to any one of claims 2-4, characterized in that, The length of the connecting segment is 3 to 5 times the length of the separating segment.

6. The manufacturing method according to claim 1, characterized in that, The method of manufacturing pipe fittings by integral molding includes: manufacturing the pipe fittings by integral extrusion molding; And / or, the manufacturing method further includes: installing a suction connector at the proximal end of the second tube, the suction connector being provided with a connecting structure for connecting the operating handle of the endoscope; And / or, after a portion of the first tube body is removed, the second tube body extends toward the distal end of the first tube body relative to the proximal end face of the first tube body to form an extension segment, the length of which is 1.5 to 3 times the length of the endoscope's operating handle.

7. The manufacturing method according to claim 1, characterized in that, After the pipe fitting is manufactured by integral molding, the process further includes: At the distal end of the first pipe body, a portion of the first pipe body is cut off to form a second installation space between the distal end of the first pipe body and the distal end of the second pipe body. The transparent end is installed in the second installation space and inserted into the first tube body.

8. The manufacturing method according to claim 7, characterized in that, Before installing the transparent head end into the second mounting space and connecting it to the distal end of the first tube, the method further includes: A transparent film is placed over the opening of the connecting tube to seal the opening, and the edge portion of the transparent film is wrapped around the outer periphery of the connecting tube. The connecting tube includes a first section and a second section arranged sequentially from its distal end to its proximal end. The fixing member is sleeved on the first section, and the transparent film, the connecting tube, and the fixing member are sealed and connected to obtain the transparent head end.

9. A catheter manufactured by the method according to any one of claims 1-8, characterized in that, The conduit includes fittings and a connector, wherein: The pipe fitting includes a first pipe body and a second pipe body arranged side by side, wherein the first pipe body and the second pipe body are integrally formed. Relative to the proximal end face of the first tube body, the second tube body extends toward the distal end away from the first tube body, and forms a first installation space between the proximal end of the first tube body and the proximal end of the second tube body; The connector is installed in the first installation space and connected to the proximal end of the first tube.

10. An endoscope kit, characterized in that, Includes the catheter and endoscope as described in claim 9.

Images