Endoscope catheter and endoscope

Abstract

The application discloses an endoscope catheter and an endoscope, and belongs to the technical field of medical devices. A first joint surface and a second joint surface are arranged at the distal end of a catheter body, and a first counter surface and a second counter surface are arranged at the proximal end of a catheter tip, so that a double cooperation connection structure in the radial direction and the axial direction can be formed, and the path of lubricating medium of a lubricating layer penetrating into the inside of the endoscope catheter is significantly prolonged. Meanwhile, the lubricating layer ends at the transition area of the outer surface of the catheter body, the transition area is located between the lubricating layer and the catheter tip, an isolation belt without coating is formed, and the medium of the lubricating layer has a certain spacing with the connection interface of the catheter body and the catheter tip. Therefore, the risk of the lubricating medium penetrating into the inside through the connection interface is blocked in the structure, the operation resistance of medical staff is reduced, and the treatment risk caused by the pollution of the instrument is avoided.

Description

Technical Field

[0001] This application belongs to the field of medical device technology, and in particular relates to an endoscopic catheter and an endoscope. Background Technology

[0002] An endoscopic catheter is a slender tube equipped with a miniature camera and light source at its tip, and is one of the core components of an endoscope. It is inserted into the body through natural cavities or small incisions, transmitting real-time images to an external monitor, allowing doctors to directly observe the internal condition. The catheter usually also has channels for inserting instruments such as biopsy forceps, scalpels, and hemostatic clips to perform minimally invasive procedures such as sampling and treatment, making it an important diagnostic and therapeutic tool in modern medicine.

[0003] There is friction between endoscopic catheters and human tissue. Some endoscopic catheters are equipped with a lubricating layer to reduce friction and thus simplify the operation for medical staff. However, catheters with lubricating coatings often have a coating medium inside the channel, which can affect their performance to some extent. Utility Model Content

[0004] This application provides an endoscope catheter and an endoscope, which aims to reduce the risk of lubricating coating medium seeping into the interior of the endoscope catheter, thereby at least partially solving the above-mentioned technical problems.

[0005] To achieve the above objectives, according to a first aspect of this application, an endoscopic catheter is provided, comprising a catheter component and a lubricating layer, the catheter component comprising:

[0006] The catheter body has a first mating surface and a second mating surface at its distal end, and the outer surface of the catheter body has a transition region and a coating region.

[0007] The catheter tip is connected to the distal end of the catheter body. The proximal end of the catheter tip is provided with a first mating surface and a second mating surface. The first mating surface and the first mating surface are radially opposite to each other and fit together. The second mating surface and the second mating surface are axially opposite to each other and fit together. The transition region is located between the catheter tip and the coating region.

[0008] The lubricating layer covers the coating area and terminates in the transition area. In some embodiments, the catheter body and the catheter tip are nested together.

[0009] In some embodiments, the catheter tip is fitted onto the distal outer periphery of the catheter body;

[0010] The first mating surface surrounds the second mating surface and covers the distal portion of the outer surface of the body, so that the distal portion of the outer surface of the body forms the first mating surface.

[0011] In some embodiments, the catheter body is fitted over the proximal periphery of the catheter tip;

[0012] The first mating surface surrounds the second mating surface and covers the proximal portion of the outer surface of the catheter tip, so that the proximal portion of the outer surface of the tip forms the first mating surface.

[0013] In some embodiments, the catheter body further includes a third mating surface, wherein the third mating surface, the first mating surface, and the second mating surface are sequentially connected in a stepped manner;

[0014] The catheter tip also includes a third mating surface, and the third mating surface, the first mating surface, and the second mating surface are connected in a stepped manner in sequence; the third mating surface and the third mating surface are opposite to each other along the axial direction and fit together.

[0015] In some embodiments, the radial distance H between the outer surface of the catheter tip and the outer surface of the body is 0 mm to 0.3 mm.

[0016] In some embodiments, the length of the transition region is 0 mm to 10 mm.

[0017] In some embodiments, the length of the transition region is 2 mm to 3 mm.

[0018] In some embodiments, the lubricating layer includes a substrate layer and a hydrophilic layer, the substrate layer being coated on the outer surface of the body, the hydrophilic layer being coated on the substrate layer, and the hydrophilic layer being configured to reduce surface friction.

[0019] In some embodiments, the total thickness of the lubricating layer does not exceed 0.3 mm.

[0020] In some embodiments, the total thickness of the lubricating layer is 5 to 10 micrometers, the thickness of the substrate layer is 1 to 2 micrometers, and the thickness of the hydrophilic layer is 4 to 8 micrometers.

[0021] According to a third aspect of this application, an endoscope is provided, comprising an endoscopic catheter as described in any of the above embodiments; and,

[0022] The endoscope body is connected to the endoscope catheter.

[0023] In the endoscopic catheter of this application embodiment, by providing a first mating surface and a second mating surface at the distal end of the catheter body, and a first abutting surface and a second abutting surface at the proximal end of the catheter tip, and by utilizing the first mating surface and the first abutting surface to be radially opposite and mutually abutting, and the second mating surface and the second abutting surface to be axially opposite and mutually abutting, a dual-fitting connection structure in both the radial and axial directions can be formed. This significantly extends the path of the lubricating medium in the lubricating layer into the interior of the endoscopic catheter. Simultaneously, the lubricating layer terminates at the transition region on the outer surface of the catheter body, which is located between the lubricating layer and the catheter tip, forming an uncoated isolation zone. This creates a certain distance between the lubricating medium and the connection interface between the catheter body and the catheter tip. Structurally, this blocks the risk of the lubricating medium seeping into the interior through the connection interface, reducing both the operational resistance for medical personnel and the treatment risk caused by instrument contamination.

[0024] The endoscope in this application includes the endoscopic catheter described above, and therefore can have all the technical features and effects of the endoscopic catheter described above, which will not be repeated here.

[0025] Other features and advantages of this application will be described in detail in the following detailed description section. Attached Figure Description

[0026] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments 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.

[0027] To gain a more complete understanding of this application and its beneficial effects, the following description will be provided in conjunction with the accompanying drawings, wherein the same reference numerals in the following description denote the same parts.

[0028] Figure 1 This is a schematic diagram of the overall structure of the endoscope provided in the embodiments of this application;

[0029] Figure 2 This is a partial structural schematic diagram of the endoscopic catheter provided in the embodiments of this application;

[0030] Figure 3 The endoscope catheter provided in the first embodiment of this application is along Figure 2 A partial structural cross-sectional view of line AA in the middle section;

[0031] Figure 4 yes Figure 3 An exploded view of the parts with the structure shown;

[0032] Figure 5 The endoscope catheter provided in the second embodiment of this application is along Figure 2 A partial structural cross-sectional view of line AA in the middle section;

[0033] Figure 6 yes Figure 5 An exploded view of the parts with the structure shown;

[0034] Figure 7 The endoscope catheter provided in the third embodiment of this application is along Figure 2 A partial structural cross-sectional view of line AA in the middle section;

[0035] Figure 8 yes Figure 7 An exploded view of the parts with the structure shown;

[0036] Figure 9 The endoscope catheter provided in the fourth embodiment of this application is along Figure 2 A partial structural cross-sectional view of line AA in the middle section;

[0037] Figure 10 yes Figure 9 An exploded view of the parts with the structure shown;

[0038] Figure 11 This is a partial structural schematic diagram of the endoscopic catheter provided in the fifth embodiment of this application;

[0039] Figure 12 This is a partial structural schematic diagram of the endoscopic catheter provided in the sixth embodiment of this application;

[0040] Figure 13 This is a partial cross-sectional schematic diagram of the catheter body and lubrication layer in an endoscopic catheter according to some embodiments of this application;

[0041] Figure 14 This is a schematic cross-sectional view of an endoscopic catheter according to some embodiments of this application;

[0042] Figure 15 This is a flowchart of the method for preparing the endoscopic catheter provided in the embodiments of this application;

[0043] Figure 16 This is one of the local cross-sectional structures in the preparation process of the embodiments of this application;

[0044] Figure 17 This is the second partial cross-sectional structure of the preparation process in the embodiments of this application;

[0045] Explanation of reference numerals in the attached figures:

[0046] 10-Endoscopic catheter; 100-Catheter component; 110-Catheter body; 111-Second mating surface; 112-First mating surface; 113-Outer surface of body; 114-Transition area; 115-Third mating surface; 116-Rigid segment; 117-Connecting part; 118-Soft segment; 120-Catheter tip; 121-Second mating surface; 122-First mating surface; 123-Outer surface of tip; 124-Connecting ring; 125-Tip body; 126-Third mating surface; 130-Lubricating layer; 131-Substrate layer; 132-Hydrophilic layer; 140-Instrument channel; 150-Injection channel; 160-Traction channel; 170-Module channel; 20-Endoscope body; 30-Support tooling; 40-Isolation layer. Detailed Implementation

[0047] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the protection scope of this application.

[0048] like Figure 1 As shown, this application provides an endoscope comprising an endoscope catheter 10 and an endoscope body 20, the endoscope body 20 being connected to the proximal end of the endoscope catheter 10. The endoscope catheter 10 has a lubricating coating, which effectively reduces frictional resistance within the human body, simplifies operation, and solves the problem of lubricating medium seeping into the interior due to coating over-boundary, thus exhibiting high reliability. Therefore, this endoscope can be used in gastrointestinal endoscopic surgery, and is particularly suitable for applications involving the gallbladder, pancreas, and appendix.

[0049] It should be noted that the proximal end is the end closer to the operator, and the distal end is the end farther from the operator compared to the proximal end. During the procedure, the proximal end of the endoscopic catheter 10 is connected to the endoscope body 20 and is therefore usually located outside the patient's body, while the distal end extends into the patient's body.

[0050] Please refer to the following: Figure 1 and Figure 2 The endoscopic catheter 10 includes a catheter component 100 and a lubricating layer 130, the lubricating layer 130 being coated on the outer surface of the catheter component 100. Specifically, the catheter component 100 includes a catheter body 110 and a catheter tip 120. The proximal end of the catheter body 110 is used to connect to the endoscope body 20, and its distal end is connected to the proximal end of the catheter tip 120. The distal end of the catheter tip 120 can be equipped with modules such as a camera and a light source.

[0051] The lubricating layer 130 covers the outer surface 113 of the catheter body 110 and terminates in a transition region 114 on the outer surface 113, which is located between the lubricating layer 130 and the catheter tip 120. That is, the lubricating layer 130 may not cover all axial positions of the outer surface 113, but may only cover a portion of it; the area on the outer surface 113 covered by the lubricating layer 130 is the coating area. The transition region 114, located between the coating area and the catheter tip 120, and not covered by the lubricating layer 130, forms an isolation between the lubricating layer 130 and the proximal connection boundary of the catheter tip 120, reducing the spread of the lubricating layer 130 to the connection boundary and thus reducing the risk of lubricating media seeping into the interior of the endoscopic catheter 10.

[0052] In addition, a lubricating layer 130 is provided on the catheter body 110, which can play a lubricating role, reduce friction between the catheter and human tissue, thereby reducing the difficulty of operation for medical staff and improving the efficiency and success rate of surgical procedures.

[0053] Please refer to the following: Figure 3 and Figure 4 A first mating surface 112 and a second mating surface 111 are provided at the distal end of the catheter body 110. A first mating surface 122 and a second mating surface 121 are provided at the proximal end of the catheter tip 120. The first mating surface 122 and the first mating surface 112 are radially opposite to each other and fit together, while the second mating surface 121 and the second mating surface 111 are axially opposite to each other and fit together.

[0054] Here, "axial" refers to the direction extending along the central axis of the catheter body 110 or the catheter tip 120. Figure 3 The X-shaped arrow indicates the axial direction; the second mating surface 121 and the second mating surface 111 are axially opposite each other, meaning that the second mating surface 121 and the second mating surface 111 are face-to-face in the axial direction, forming a relationship where their end faces face each other. "Radial" refers to the direction perpendicular to the central axis of the catheter body 110 or the catheter tip 120 and pointing outwards or towards the center. Figure 3 The radial direction is indicated by a Y-arrow; the first mating surface 122 and the first mating surface 112 are radially opposite each other, that is, the first mating surface 122 and the first mating surface 112 are face to face in the radial direction, forming an inner and outer annular surface facing each other. "Mutual contact" refers to the physical contact between the two opposing surfaces to achieve connection and fit.

[0055] Thus, the first mating surface 122 and the first mating surface 112 cooperate to form inner and outer annular surface contact, creating an axial sealing path. The second mating surface 121 and the second mating surface 111 cooperate to form end-face top contact, creating a radial sealing path. Through the axial and radial sealing paths, the path for the lubricating medium in the lubricating layer 130 to penetrate into the endoscope catheter 10 is significantly extended, further reducing the risk of the lubricating medium penetrating into the interior through the connection interface, ensuring the unobstructed flow of the internal channel, reducing obstruction to the instrument, and also reducing the treatment risks caused by instrument contamination.

[0056] In some embodiments, the catheter body 110 and the catheter tip 120 are nested together. Nesting means that one of the catheter body 110 and the catheter tip 120 is inserted into and partially wrapped around the other, either inside or outside. This improves the stability of the connection and forms the aforementioned radial and axial dual-fit connection structure, with the internal and external fit enhancing the sealing path.

[0057] Please refer to it again. Figure 3 and Figure 4 In the first embodiment, the catheter tip 120 is fitted onto the distal outer periphery of the catheter body 110; the first mating surface 122 surrounds the second mating surface 121 and covers the distal portion of the outer surface 113 of the body, so that the distal portion of the outer surface 113 of the body forms the first mating surface 112. In this embodiment, the proximal end of the catheter tip 120 is configured as a concave cavity. Figure 4 The bottom wall of the concave cavity is approximately perpendicular to the axial direction, and the side walls surround the bottom wall. The side walls are the first mating surface 122, and the bottom wall is the second mating surface 121. The distal end of the catheter body 110 is inserted axially into the concave cavity near the proximal end of the catheter tip 120, such that its second mating surface 111 and the second mating surface 121 are axially opposite to and fit together. The first mating surface 122 covers the distal portion of the outer surface 113 of the body, so that the distal portion forms the first mating surface 112 that is radially opposite to and fits the first mating surface 122.

[0058] Please refer to the following: Figure 5 and Figure 6 Slightly different from the first embodiment, in the second embodiment, the catheter body 110 is fitted onto the proximal outer periphery of the catheter tip 120; the first mating surface 112 surrounds the second mating surface 111 and covers the proximal portion of the outer surface 123 of the catheter tip 120, so that the proximal portion of the outer surface 123 forms the first mating surface 122. That is, in this embodiment, the distal end of the catheter body 110 is configured as a concave cavity. Figure 6The bottom wall of the concave cavity is approximately perpendicular to the axial direction, and the side walls surround the bottom wall. The side walls are the first mating surface 112, and the bottom wall is the second mating surface 111. The proximal end of the catheter tip 120 is inserted into the concave cavity at the distal end of the catheter body 110, such that its second mating surface 121 and the second mating surface 111 are axially opposite and fit together. The first mating surface 112 covers the proximal portion of the outer surface 123 of the tip, so that the proximal portion forms a first mating surface 122 that is radially opposite to the first mating surface 112.

[0059] Please refer to the following: Figures 7 to 10 In some embodiments, the catheter body 110 further includes a third mating surface 115, wherein the third mating surface 115, the first mating surface 112, and the second mating surface 111 are sequentially connected in a stepped manner. Correspondingly, the catheter tip 120 further includes a third mating surface 126, wherein the third mating surface 126, the first mating surface 122, and the second mating surface 121 are sequentially connected in a stepped manner; the third mating surface 126 and the third mating surface 115 are axially opposite to each other and fit together. By setting the distal end of the catheter body 110 and the proximal end of the catheter tip 120 into stepped structures, at least three seals are formed. The lubricating medium forming the lubricating layer 130 must pass through at least the radial first seal formed by the third mating surface 126 and the third mating surface 115, the axial second seal formed by the second mating surface 111 and the second mating surface 121, and the radial third seal formed by the first mating surface 112 and the first mating surface 122 before it can penetrate into the interior, thus further extending the penetration path. In addition, the stepped structure also makes the outer surface 113 of the main body of the catheter body 110 and the outer surface 123 of the end of the catheter tip 120 roughly flush, that is, the diameters of the catheter body 110 and the catheter tip 120 are roughly the same, further reducing the increase in friction caused by the protrusion of one of the surfaces.

[0060] Specifically, please refer to Figure 7 and Figure 8 In the third embodiment, the catheter tip 120 is fitted onto the distal outer periphery of the catheter body 110. The proximal end of the catheter tip 120 forms a concave cavity, the sidewall of which is a first mating surface 122, the bottom wall a second mating surface 121, and the outer surface of the opening a third mating surface 126; the distal end of the catheter body 110 forms a convex structure. Figure 8 The sidewall of the convex structure is the first mating surface 112, the end face is the second mating surface 111, and the bottom circumferential surface is the third mating surface 115. The first mating surface 122 and the first mating surface 112 are radially opposite and fit together, the second mating surface 121 and the second mating surface 111 are axially opposite and fit together, and the third mating surface 126 and the third mating surface 115 are radially opposite and fit together.

[0061] Please see Figure 9 and Figure 10 In the fourth embodiment, the catheter body 110 is fitted onto the proximal periphery of the catheter tip 120. The proximal end of the catheter tip 120 forms a convex structure, the sidewall of which is a first mating surface 122, the end face is a second mating surface 121, and the bottom circumferential surface is a third mating surface 126; the distal end of the catheter body 110 forms a concave cavity. Figure 10 The concave cavity has a first mating surface 112 on its sidewall, a second mating surface 111 on its bottom wall, and a third mating surface 115 on the outer side of its opening. The first mating surface 122 and the first mating surface 112 are radially opposite to each other and fit together, the second mating surface 121 and the second mating surface 111 are axially opposite to each other and fit together, and the third mating surface 126 and the third mating surface 115 are radially opposite to each other and fit together.

[0062] Please refer to it again. Figure 3 In some embodiments, the radial distance H between the outer surface 123 of the catheter tip 120 and the outer surface 113 of the main body is 0 mm to 0.3 mm. That is, the distance H can be any value among 0 mm, 0.1 mm, 0.2 mm, and 0.3 mm, or a range between any two values. By controlling the distance within the above range, the surfaces of the catheter body 110 and the catheter tip 120 are made nearly flush, reducing the surface protrusion size, thereby further reducing friction with human tissue, improving smoothness, and reducing the difficulty of operation. Furthermore, during the manufacturing process, because the two surfaces are nearly flush, the isolation layer 40 is more tightly covered, resulting in a better covering effect, which can improve the isolation effect and further reduce the risk of lubricating medium penetration.

[0063] In some embodiments, the length L2 of the transition region 114 is 0 mm to 10 mm. That is, the length L2 can be any value or a range between any two values ​​from 0 mm, 1 mm, 2 mm, 3 mm, 4 mm, 5 mm, 6 mm, 7 mm, 8 mm, 9 mm, and 10 mm. The smaller the length L2, the larger the coverage area of ​​the lubricating layer 130, and the better the lubrication and drag reduction effect; the larger the length L2, the greater the distance between the lubricating layer 130 and the connection boundary between the catheter body 110 and the catheter tip 120, and the better the anti-seepage effect. Considering the lubrication effect, anti-seepage effect, and manufacturing difficulty, the length L2 of the transition region 114 can be set to 2 mm to 3 mm.

[0064] Please see Figure 11Unlike the previous embodiments where the catheter tip 120 was a single-piece structure, in the fifth embodiment, the catheter tip 120 includes a tip body 125 and a connecting ring 124. The distal end of the connecting ring 124 is connected to the tip body 125, and the proximal end of the connecting ring 124 is connected to the catheter body 110. The connecting ring 124 has a ring-shaped structure, with the first mating surface 122 and the second mating surface 121 at the end facing the catheter body 110. Furthermore, when the catheter body 110 has a third mating surface 115, the connecting ring 124 also has a corresponding third mating surface 126.

[0065] Please see Figure 12 In the sixth embodiment, the catheter body 110 includes a rigid segment 116 and a flexible segment 118, the latter being more flexible and easier to bend than the rigid segment 116. The flexible segment 118 is located at the distal end of the rigid segment 116, and the two are connected by a connecting portion 117. The distal end of the flexible segment 118 is connected to the catheter tip 120. In use, the flexible segment 118 is inserted into the body first. The flexible segment 118 has better elasticity and flexibility, making it easier to bend within the body. The rigid segment 116 is used by the operator to apply insertion force, making it easier to insert the entire endoscopic catheter 10 into the body. The lubricating layer 130 covers portions of the rigid segment 116 and the flexible segment 118, ensuring that both portions entering the body receive lubrication and resistance reduction.

[0066] The length L1 of the lubricating layer 130 is from 1 mm to 500 mm, for example, it can be any value among 1 mm, 100 mm, 200 mm, 300 mm, 400 mm, and 500 mm, or a range between any two values. Optionally, the length L1 is from 300 mm to 400 mm, which makes it more suitable for applications such as those involving the gallbladder, pancreas, and appendix.

[0067] Please see Figure 13 In some embodiments, the lubricating layer 130 includes a substrate layer 131 and a hydrophilic layer 132. The substrate layer 131 is coated on the outer surface 113 of the main body, and the hydrophilic layer 132 is coated on the substrate layer 131. The hydrophilic layer 132 is configured to reduce surface friction. The substrate layer 131 is a mixture of solvent ethanol and photoinitiator dimethyl acetone, and the hydrophilic layer 132 is a mixture of solvent ethanol and polyvinylpyrrolidone. The substrate layer 131 levels the outer surface 113 of the catheter body 110, making it easier for the hydrophilic layer 132 to be coated and fixed onto the catheter body 110, thus ensuring the performance of the lubricating layer 130.

[0068] Optionally, the substrate of the catheter body 110 can be made of polyether block polyamide material, which has good resilience and elastic recovery.

[0069] In some embodiments, the total thickness M of the lubricating layer 130 does not exceed 0.3 mm, which can ensure lubrication and reduce the phenomenon of easy peeling of the coating due to excessive thickness.

[0070] Optionally, the total thickness M of the lubricating layer 130 is 5 to 10 micrometers, wherein the thickness M1 of the substrate layer 131 is 1 to 2 micrometers, and the thickness M2 of the hydrophilic layer 132 is 4 to 8 micrometers. Controlling the thickness M1 of the substrate layer 131 to 1 to 2 micrometers allows for precise filling of the uneven surface of the conduit body 110, forming a smooth base surface and preventing uneven coating of the hydrophilic layer 132. Controlling the thickness M2 of the hydrophilic layer 132 to 4 to 8 micrometers forms a continuous hydration film, effectively reducing the risk of cracking due to accumulated internal stress.

[0071] It should be noted that all dimensional parameters in the embodiments of this application can be obtained using existing measurement techniques such as micrometers, vernier calipers, and optical measurement.

[0072] Please see Figure 14 The endoscopic catheter 10 has an axially extending instrument channel 140, a fluid injection channel 150, a traction channel 160, and a module channel 170. The instrument channel 140 allows surgical instruments such as guidewires and biopsy forceps to pass through it. The fluid injection channel 150 allows fluid to pass through, clearing obstructions such as blood from the camera's view during surgery, ensuring a clear view. The traction channel 160 allows the traction wire to pass through, controlling the direction of the catheter tip 120 and the catheter body 110 (especially the soft section 118), facilitating operator control of the entire endoscopic catheter 10 using the traction wire. The module channel 170 allows the camera and its fiber optic cable to pass through, providing a fiber optic light source and enabling camera imaging.

[0073] Please refer to the following: Figure 15 , Figure 16 and Figure 17 This application also provides a method for preparing an endoscopic catheter 10. This method can be used to prepare the endoscopic catheter 10 described above. Specifically, the method includes:

[0074] A support fixture 30 is inserted into the catheter component 100. The catheter component 100 includes a catheter body 110 and a catheter end 120. The distal end of the catheter body 110 is provided with a first mating surface 112 and a second mating surface 111. The catheter end 120 is connected to the distal end of the catheter body 110. The proximal end of the catheter end 120 is provided with a first mating surface 122 and a second mating surface 121. The first mating surface 122 and the first mating surface 112 are radially opposite to each other and fit together. The second mating surface 121 and the second mating surface 111 are axially opposite to each other and fit together.

[0075] An isolation layer 40 is installed on the catheter component 100, such that the isolation layer 40 covers the catheter tip 120 and covers the outer surface 113 of the main body of the catheter body 110, so as to form a transition region 114 on the outer surface 113 of the main body.

[0076] A lubricating layer 130 is formed on the outer surface 113 of the main body. The lubricating layer 130 covers a transition region 114 on the outer surface 113 of the main body. The transition region 114 is located between the lubricating layer 130 and the conduit end 120.

[0077] Therefore, this manufacturing method maintains the shape of the catheter by inserting a support fixture 30 into the catheter component 100, and precisely covers the catheter tip 120 with an isolation layer 40 that extends to the outer surface 113 of the main body to define the boundary of the transition region 114, ensuring that the coating of the lubricating layer 130 strictly terminates in this region. This process, when manufacturing the endoscopic catheter 10, utilizes the double-contact sealing of the catheter component 100 and the physical isolation between the isolation layer 40 and the transition region 114 to achieve seepage prevention, effectively solving the problem of media seeping into the internal channel due to coating boundary transgressions, and ensuring product consistency and reliability.

[0078] Specifically, the support fixture 30 can be a slender cylindrical structure that can be inserted into the instrument channel 140 to support the catheter component 100, making the catheter component 100 approximately straight. The length of the support fixture 30 is greater than the length of the lubricating layer 130, and the radial projection of the lubricating layer 130 lies within the support fixture 30. Thus, the support fixture 30 supports the area where the lubricating layer 130 needs to be applied, ensuring uniform coating and improving the success rate of coating.

[0079] The insulating layer 40 is made of a waterproof material. For example, it can be electrical tape, waterproof tape, etc. Optionally, the insulating layer 40 is made of PTFE (Polytetrafluoroethylene).

[0080] In some embodiments, a lubricating layer 130 is formed covering the outer surface 113 of the body, including:

[0081] The conduit component 100 is uniformly immersed in the substrate layer 131 solution, removed and cured to form the substrate layer 131 on the outer surface 113 of the main body;

[0082] The conduit component 100 is uniformly immersed in the hydrophilic layer 132 solution, removed and cured to form a hydrophilic layer 132 on the substrate layer 131. The hydrophilic layer 132 is configured to reduce surface friction.

[0083] The substrate layer 131 solution is a mixed solution of solvent ethanol and photoinitiator dimethyl acetone, and the hydrophilic layer 132 solution is a mixed solution of ethanol and polyvinylpyrrolidone.

[0084] When coating the substrate layer 131, the conduit component 100 can be vertically immersed in the substrate layer 131 solution, removed and rotated to make the solidification process of the substrate layer 131 more uniform.

[0085] When coating the hydrophilic layer 132, the conduit component 100 can be vertically immersed in the hydrophilic layer 132 solution, removed and rotated to make the hydrophilic layer 132 solidify more evenly.

[0086] In the description of this application, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more features. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0087] In the above embodiments, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions in other embodiments.

[0088] The embodiments, implementation methods, and related technical features of this application can be combined and substituted for each other without conflict.

[0089] The above are merely preferred embodiments of this application and are not intended to limit this application in any way. Any simple modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of this application without departing from the scope of the technical solution of this application shall still fall within the scope of the technical solution of this application.

Claims

1. An endoscopic catheter (10), characterized in that, The catheter assembly (100) includes a conduit component (100) and a lubricating layer (130), the conduit component (100) comprising: The catheter body (110) has a first mating surface (112) and a second mating surface (111) at its distal end. The outer surface (113) of the catheter body (110) has a transition region (114) and a coating region. A catheter tip (120) is connected to the distal end of the catheter body (110). The proximal end of the catheter tip (120) is provided with a first mating surface (122) and a second mating surface (121). The first mating surface (122) and the first mating surface (112) are radially opposite to each other and fit together. The second mating surface (121) and the second mating surface (111) are axially opposite to each other and fit together. The transition region (114) is located between the catheter tip (120) and the coating region. The lubricating layer (130) covers the coating area and terminates in the transition area (114).

2. The endoscopic catheter (10) according to claim 1, characterized in that, The catheter body (110) and the catheter tip (120) are nested and connected to each other.

3. The endoscopic catheter (10) according to claim 2, characterized in that, The catheter tip (120) is fitted onto the distal outer periphery of the catheter body (110); The first mating surface (122) surrounds the second mating surface (121) and covers the distal portion of the outer surface (113) of the main body, so that the distal portion of the outer surface (113) of the main body forms the first mating surface (112).

4. The endoscopic catheter (10) according to claim 2, characterized in that, The catheter body (110) is fitted onto the proximal periphery of the catheter tip (120); The first mating surface (112) surrounds the second mating surface (111) and covers the proximal portion of the outer surface (123) of the catheter tip (120) so that the proximal portion of the outer surface (123) forms the first mating surface (122).

5. The endoscopic catheter (10) according to claim 2, characterized in that, The catheter body (110) also includes a third mating surface (115), wherein the third mating surface (115), the first mating surface (112), and the second mating surface (111) are connected in a stepped manner. The catheter tip (120) also includes a third mating surface (126), the third mating surface (126), the first mating surface (122) and the second mating surface (121) are connected in a stepped manner; the third mating surface (126) and the third mating surface (115) are axially opposite to each other and fit together.

6. The endoscopic catheter (10) according to any one of claims 3 to 5, characterized in that, The radial distance H between the outer surface (123) of the catheter tip (120) and the outer surface (113) of the main body is 0 mm to 0.3 mm.

7. The endoscopic catheter (10) according to claim 1, characterized in that, The length of the transition region (114) is 0 mm to 10 mm.

8. The endoscopic catheter (10) according to claim 7, characterized in that, The length of the transition region (114) is 2 mm to 3 mm.

9. The endoscopic catheter (10) according to claim 1, characterized in that, The lubricating layer (130) includes a substrate layer (131) and a hydrophilic layer (132), the substrate layer (131) being coated on the outer surface (113) of the body, the hydrophilic layer (132) being coated on the substrate layer (131), and the hydrophilic layer (132) being configured to reduce surface friction.

10. The endoscopic catheter (10) according to claim 9, characterized in that, The total thickness of the lubricating layer (130) does not exceed 0.3 mm.

11. The endoscopic catheter (10) according to claim 10, characterized in that, The total thickness of the lubricating layer (130) is 5 to 10 micrometers, the thickness of the substrate layer (131) is 1 to 2 micrometers, and the thickness of the hydrophilic layer (132) is 4 to 8 micrometers.

12. An endoscope, characterized in that, Including the endoscopic catheter (10) as described in any one of claims 1 to 11; and, Endoscope body (20), which is connected to the endoscope catheter (10).

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