Medical endoscope catheter

Abstract

This utility model belongs to the field of medical device technology, specifically relating to a medical endoscope catheter, comprising: a tubular body, wherein an airflow channel extending axially along the inner wall of the tubular body is provided; an end wall, disposed at the first end of the tubular body, wherein a through hole is provided through the end wall, and a rib is provided on the side of the end wall facing the inner cavity of the tubular body, wherein multiple ribs are spaced apart circumferentially along the tubular body; the circumferential spacing between adjacent ribs gradually increases in a clockwise or counterclockwise direction along the circumference of the tubular body. This utility model, through the design of the ribs, makes the circumferential spacing between adjacent ribs gradually increase in a certain direction, thereby forming an orderly flow velocity gradient along the entire circumference; this not only eliminates secondary splashing of contaminants caused by airflow turbulence, but also achieves comprehensive and efficient cleaning of the lens surface by forming a uniform sweeping flow field.

Description

Technical Field

[0001] This utility model belongs to the field of medical device technology, specifically relating to a medical endoscope catheter. Background Technology

[0002] During laparoscopic surgery, the endoscope lens often fogs up due to water vapor condensation and splashing of blood and tissue debris, resulting in a blurred or even completely lost surgical field. This forces surgeons to frequently interrupt the operation to clean the lens, disrupting the surgical rhythm, prolonging the operation time, and increasing workload. While existing endoscopic catheter technology achieves cleaning by delivering fluid in front of the lens, it still has significant drawbacks: firstly, the catheter lacks effective airflow constraint, only forming a simple airflow channel, making it difficult to precisely control the airflow angle and coverage area, resulting in poor cleaning effectiveness; secondly, the disordered airflow distribution leads to significant airflow waste, forcing the gas supply system to increase its working pressure to meet the demand, thus increasing energy consumption. Utility Model Content

[0003] In view of the shortcomings of the prior art described above, the purpose of this utility model is to provide a medical endoscope catheter that can improve the cleaning effect and efficiency of endoscopes.

[0004] To achieve the above and other related objectives, this utility model provides a medical endoscope catheter, comprising:

[0005] A tubular body, wherein an airflow channel is provided inside the tube wall of the tubular body extending along the axial direction of the tubular body, the airflow channel is connected to the inner cavity of the tubular body at a first end, and an air inlet for connecting an air source is formed at a second end of the tubular body.

[0006] An end wall is provided at the first end of the tubular body. The end wall has a through hole that penetrates the end wall. A rib is provided on the side of the end wall facing the inner cavity of the tubular body. The inner end of the rib extends to the edge of the through hole, and the outer end of the rib extends to the tube wall of the tubular body. Multiple ribs are spaced apart circumferentially along the tubular body. The circumferential spacing between adjacent ribs gradually increases in a clockwise or counterclockwise direction along the circumference of the tubular body.

[0007] The end wall is set at an angle to the axial direction of the tubular body, and the two largest spacings between adjacent ribs are set near the operating side of the end wall, which is the side of the end wall near the second end of the tubular body.

[0008] In an optional embodiment of the present invention, the wall surface of the end wall between at least two adjacent ribs is recessed in a direction away from the inner cavity of the tubular body.

[0009] In an optional embodiment of this utility model, the wall surface of the end wall between the two adjacent ribs with the smallest circumferential spacing or between the two adjacent ribs with the second smallest circumferential spacing is recessed in a direction away from the inner cavity of the tubular body.

[0010] In an optional embodiment of this utility model, five ribs are arranged at intervals along the circumference of the tubular body, wherein the wall surface of the end wall between the two adjacent ribs with the smallest circumferential spacing is recessed in the direction away from the inner cavity of the tubular body, and the recess depth is 0.5mm to 0.6mm.

[0011] In an optional embodiment of this utility model, six ribs are arranged at intervals along the circumference of the tubular body, wherein the wall surface of the end wall between two adjacent ribs with the second smallest circumferential spacing is recessed in the direction away from the inner cavity of the tubular body, and the recess depth is 0.5mm to 0.6mm.

[0012] In an optional embodiment of this utility model, the width of the rib gradually decreases from the outer end to the inner end, and the height of the rib is 0.1mm to 0.3mm.

[0013] In an optional embodiment of this utility model, the included angle between the two opposing side walls of the convex rib in the circumferential direction of the tubular body is less than or equal to 15°.

[0014] In an optional embodiment of this utility model, a protruding ridge is provided on the inner wall of the tubular body near the first end, and the length direction of the protruding ridge is parallel to the axial direction of the tubular body.

[0015] In an optional embodiment of this utility model, the protruding ridge is connected to the outer end of the protruding rib.

[0016] In an optional embodiment of this utility model, the width of the convex ridge gradually increases from the end away from the first end to the end closer to the first end.

[0017] In an optional embodiment of this utility model, the tubular body includes a first section and a second section. The first section is adjacent to the end wall, and the second section is connected to the end of the first section away from the end wall. The tube wall of the first section is a single-layer structure, and the tube wall of the second section is a double-layer structure. The double-layer tube walls of the second section are spaced apart to form the airflow channel.

[0018] In an optional embodiment of this utility model, the second section includes an inner tube and an outer tube. A protrusion is provided on one end of the inner tube near the end wall. The length direction of the protrusion is parallel to the axis of the inner tube. The protrusion protrudes at least from the outer wall of the inner tube and abuts against the inner wall of the outer tube.

[0019] In an optional embodiment of this utility model, the protrusion extends beyond the inner wall of the inner tube.

[0020] In an optional embodiment of this utility model, a boss is provided at the end of the first section away from the end wall, and a plurality of bosses are arranged circumferentially along the first section. The end of the inner tube near the end wall abuts against the boss, so that a radial channel connecting the airflow channel and the inner cavity of the tubular body is formed between the inner tube and the first section.

[0021] The technical advantages of this invention are as follows: By designing the ribs, the circumferential spacing between adjacent ribs gradually increases in a certain direction. When the endoscope tip contacts the ribs, a radial air path with a gradually changing width is formed between the end wall and the lens. When the cleaning gas enters the radial air path from the annular cavity, a significant velocity difference is generated at different widths of the air path. The flow velocity is faster at the narrow slit and slower at the wide slit, thus forming an orderly flow velocity gradient in the entire circumferential direction. This gradient airflow effectively avoids the problem of a central stagnation zone on the lens surface caused by the collision of equal-velocity airflows. It not only eliminates the secondary splashing of contaminants caused by airflow turbulence, but also achieves comprehensive and efficient cleaning of the lens surface by forming a uniform sweeping flow field. Attached Figure Description

[0022] Figure 1 This is a partial perspective view of the medical endoscope catheter provided in Embodiment 1 of this utility model;

[0023] Figure 2 This is a cross-sectional view of the medical endoscope catheter provided in Embodiment 1 of this utility model;

[0024] Figure 3 yes Figure 2 AA section view;

[0025] Figure 4 This is a partial perspective view of the medical endoscope catheter provided in Embodiment 2 of this utility model;

[0026] Figure 5 This is a cross-sectional view of the medical endoscope catheter provided in Embodiment 2 of this utility model;

[0027] Figure 6 yes Figure 5 BB section view;

[0028] Figure 7 This is a partial perspective view of the medical endoscope catheter provided in Embodiment 3 of this utility model;

[0029] Figure 8 This is a cross-sectional view of the medical endoscope catheter provided in Embodiment 3 of this utility model;

[0030] Figure 9 yes Figure 8 CC section view;

[0031] Figure 10a , 10b These are schematic diagrams of the shear stress distribution on the lens surface under the first experimental conditions for Embodiment 1 and Comparative Example 1 of this utility model, respectively.

[0032] Figure 11a , 11b These are schematic diagrams of the shear stress distribution on the lens surface under the second experimental conditions, representing Embodiments 1 and 3 of this utility model, respectively.

[0033] Explanation of reference numerals in the attached drawings: 100, endoscope; 10, tubular body; 101, airflow channel; 102, radial channel; 11, first section; 111, boss; 112, ridge; 12, second section; 121, inner tube; 1211, ridge; 122, outer tube; 20, end wall; 201, recessed structure; 21, through hole; 22, rib. Detailed Implementation

[0034] The following specific examples illustrate the implementation of this utility model. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification. This utility model can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of this utility model. It should be noted that, unless otherwise specified, the following embodiments and features described therein can be combined with each other.

[0035] It should be noted that the illustrations provided in the following embodiments are only schematic representations of the basic concept of the present invention. Therefore, the illustrations only show the components related to the present invention and are not drawn according to the number, shape and size of the components in actual implementation. In actual implementation, the form, quantity and proportion of each component can be arbitrarily changed, and the layout of the components may also be more complex.

[0036] Please see Figure 3 , 6As shown in Figures 9 and 1, the medical endoscope catheter provided by this utility model is used in conjunction with the endoscope 100. The endoscope catheter is used to guide the endoscope 100 into the patient's body and deliver cleaning gas to the lens surface of the endoscope 100 to remove foreign objects from the lens surface.

[0037] The technical solution of this utility model will be described in detail below with reference to several specific embodiments:

[0038] Example 1

[0039] Please see Figure 1-3 As shown, the medical endoscopic catheter provided by this utility model includes a tubular body 10 and an end wall 20; the tubular body 10 has an airflow channel 101 extending axially along the tubular body 10 inside its wall, the airflow channel 101 communicating with the inner cavity of the tubular body 10 at a first end, and forming an air inlet for connecting to a gas source at a second end of the tubular body 10; the end wall 20 is disposed at the first end of the tubular body 10, the end wall... The endoscope 100 has a through hole 21 penetrating the end wall 20. A rib 22 is provided on the side of the end wall 20 facing the inner cavity of the tubular body 10. The inner end of the rib 22 extends to the edge of the through hole 21, and the outer end of the rib 22 extends to the wall of the tubular body 10. Multiple ribs 22 are spaced apart circumferentially along the tubular body 10. The circumferential spacing between adjacent ribs 22 gradually increases clockwise or counterclockwise along the circumference of the tubular body 10. In use, the endoscope 100 is inserted into the catheter, and the tip of the endoscope 100 abuts against the rib 22, thereby forming a radial air path with a gradually changing width between the end wall 20 and the tip of the endoscope 100. Cleaning gas first enters the annular cavity between the catheter and the endoscope 100 through the airflow channel 101, then enters the radial air path from the annular cavity, and finally blows onto the lens surface. In some embodiments, the end wall 20 can be set in an inclined shape, that is, the end wall 20 is set at an angle to the axis of the tubular body 10, so as to facilitate the puncture operation of the catheter. In this case, the two largest gaps between adjacent ribs 22 are set close to the operation side of the end wall 20. The operation side is the side of the end wall 20 close to the second end of the tubular body 10. This can generate an air cushion perpendicular to the lens surface and improve the fog removal effect.

[0040] This invention, through the design of the ribs 22, gradually increases the circumferential spacing between adjacent ribs 22 in a certain direction. When the front end of the endoscope 100 contacts the ribs 22, a radial air path with a gradually changing width is formed between the end wall 20 and the lens. When the cleaning gas enters the radial air path from the annular cavity, a significant velocity difference is generated at the air path with different widths. The flow velocity is faster at the narrow slit and slower at the wide slit, thus forming an orderly flow velocity gradient in the entire circumferential direction. This gradient airflow effectively avoids the problem of a central stagnation zone on the lens surface caused by the collision of airflows of the same velocity. It not only eliminates the secondary splashing of contaminants caused by airflow turbulence, but also achieves comprehensive and efficient cleaning of the lens surface by forming a uniform sweeping flow field.

[0041] The technical effects of this utility model will be further explained below based on simulation comparison results:

[0042] Please see Figure 10a , 10b The figures shown are shear stress distribution diagrams of the lens surface under the first experimental conditions for Embodiment 1 and Comparative Example 1 of this utility model, respectively. In Comparative Example 1, the radial air path is uniformly and symmetrically distributed. The specific shear stress distribution data of Embodiment 1 and Comparative Example 1 are shown in the table below:

[0043] Table 1. Percentage of shear stress range on lens surface

[0044]

[0045] Table 1 (in conjunction with) Figure 10a , 10b As can be seen, the shear stress distribution cloud diagram of Example 1 is as follows: Figure 10a As shown, the shear stress gradually decreases from the lens edge to the lens center. Most areas meet the requirement of being greater than the critical value of 0.1 Pa, accounting for 84.31% of the area. The area meeting the critical value of 0.3 Pa accounts for 64.55% of the area. The shear stress distribution cloud map of Comparative Example 1 is shown below. Figure 10b As shown, the shear stress gradually decreases from the lens edge to the lens center. The area that meets the requirement of greater than the critical value of 0.1 Pa accounts for 74.34%, and the area that meets the requirement of 0.3 Pa accounts for 42.95%. By comparing the area proportions of Example 1 and Comparative Example 1, the area of ​​Example 1 that meets the requirement of greater than the critical value of 0.1 Pa is about 10% higher than that of Comparative Example 1, and the area that meets the requirement of greater than the critical value of 0.3 Pa is 21.6% higher than that of Comparative Example 1. Therefore, the defogging effect of Example 1 has a significant advantage compared with the traditional symmetrical structure.

[0046] Please see Figure 1 , 3As shown, in an optional embodiment of this invention, the wall surface of the end wall 20 between at least two adjacent ribs 22 is recessed in the direction away from the inner cavity of the tubular body 10 to form a recessed structure 201. The recessed structure 201 significantly increases the thickness of the radial air passage at the corresponding location, forming a relatively wide airflow channel 101. Although a thinner air passage can generate high-speed airflow to sweep the lens edge, the airflow will rapidly attenuate due to friction with the surface as it travels along the lens surface, resulting in insufficient kinetic energy to cover the center of the lens. This thickened channel allows for sufficient attenuation redundancy of some gas, ensuring that some airflow can reach the center area of ​​the lens. This ensures that the entire lens surface is adequately and uniformly flushed by airflow, compensating for the shortcomings of a single thin-layer air passage design and achieving full coverage of the cleaning effect. In a specific embodiment, the depth of the recessed structure 201 is 0.5mm to 0.6mm, preferably 0.55mm.

[0047] Please see Figure 2 As shown, in an optional embodiment of this invention, the width of the rib 22 gradually decreases from the outer end to the inner end. By designing the width of the rib 22 to gradually decrease from the outer end to the inner end, this invention significantly increases the outlet cross-sectional area of ​​the airflow near the center of the through hole 21, effectively reducing the resistance of the airflow ejected from this key area. This allows more cleaning gas to be guided more smoothly to and cover the center area of ​​the lens, compensating for the problem of insufficient cleaning force in the center that may be caused by the attenuation of airflow along the lens surface. This ensures a uniform and consistent rinsing effect from the edge to the center of the lens, improving the comprehensiveness and reliability of cleaning. Furthermore, the height of the rib 22 is 0.1mm to 0.3mm. It should be understood that the smaller the height of the rib 22, the greater the shear stress and the greater the required blowing pressure. The height of 0.1mm to 0.3mm chosen in this embodiment can achieve a good defogging effect while avoiding excessive blowing pressure, thus achieving a balance between defogging effect and air source consumption. In a preferred embodiment, the height of the rib 22 can be, for example, 0.2mm.

[0048] Please see Figure 2 As shown, in an optional embodiment of this invention, the included angle α between the two opposing side walls of the rib 22 in the circumferential direction of the tubular body 10 is less than or equal to 15°. It should be understood that if the included angle α is too large, the outer end of the rib 22 will occupy too much area, thereby increasing flow resistance. Therefore, this invention limits the included angle α to within 15°, which can improve the overall flow capacity of the radial air passage while ensuring the opening of the radial air passage outlet. In a preferred embodiment, the included angle α can be, for example, 7° to 15°.

[0049] Please see Figure 1-3As shown, in an optional embodiment of this utility model, five ribs 22 are arranged at circumferential intervals along the tubular body 10, wherein the wall surface of the end wall 20 between the two adjacent ribs 22 with the smallest circumferential spacing is recessed in the direction away from the inner cavity of the tubular body 10. This utility model ensures that the airflow has sufficient kinetic energy to penetrate to the center region of the lens by setting the recessed structure 201 between the two ribs 22 with the smallest circumferential spacing, that is, at the narrowest point of the radial air passage. According to the principle of fluid dynamics, the airflow has the highest velocity at the narrowest point, but the narrow channel limits the overall flow rate, resulting in insufficient airflow kinetic energy to reach the center of the lens. The recessed structure 201 of this utility model thickens this part of the air passage, significantly increasing the flow cross-sectional area. Without weakening the original high velocity advantage, it greatly increases the gas flow rate to the center of the lens. This retains the strong anti-attenuation ability of the high-speed airflow and provides it with a sufficient total medium volume, ultimately ensuring that the airflow with sufficient kinetic energy can effectively penetrate to the center region of the lens and achieve comprehensive cleaning.

[0050] Please see Figure 1-3As shown, in an optional embodiment of the present invention, the tubular body 10 includes a first section 11 and a second section 12. The first section 11 is adjacent to the end wall 20, and the second section 12 is connected to the end of the first section 11 away from the end wall 20. The wall of the first section 11 is a single-layer structure, and the wall of the second section 12 is a double-layer structure. The double-layer walls of the second section 12 are spaced apart to form the airflow channel 101. In an optional embodiment of the present invention, the second section 12 includes an inner tube 121 and an outer tube 122. A boss 111 is provided at the end of the first section 11 away from the end wall 20. A plurality of bosses 111 are spaced apart circumferentially along the first section 11. The end of the inner tube 121 near the end wall 20 abuts against the boss 111, so that a radial channel 102 connecting the airflow channel 101 and the inner cavity of the tubular body 10 is formed between the inner tube 121 and the first section 11. This invention divides the tubular body 10 into a single-layer first section 11 and a double-layer second section 12. The first section 11 utilizes circumferentially spaced bosses 111 that abut against the end of the inner tube 121 to form radial channels 102. This design greatly simplifies the manufacturing process of the conduit. The single-layer structure of the first section 11 avoids the overall processing difficulties of complex internal air passages, while the second section 12 can form a closed airflow channel 101 simply by fitting the inner and outer tubes 122 together, eliminating the need for complex integral multi-channel molding technology. Simultaneously, the bosses 111 not only precisely position the inner tube 121, but their spaced arrangement naturally forms multiple radial channels 102, replacing the traditional process of precision drilling or grooving on the tube wall. This significantly reduces the manufacturing precision requirements and assembly complexity of the parts, improves production efficiency and product yield, and achieves a balance between high performance and low manufacturing costs.

[0051] Example 2

[0052] Please see Figure 4-6 As shown, the only difference between this embodiment and Embodiment 1 is that:

[0053] The tubular body 10 has a raised ridge 112 on its inner wall near the first end, and the length direction of the raised ridge 112 is parallel to the axial direction of the tubular body 10. This embodiment achieves stable support and precise positioning of the endoscope 100 by providing axially parallel raised ridges 112 on the inner wall of the tubular body 10 near the first end. These raised ridges 112 contact the outer surface of the endoscope 100, significantly reducing the friction area and facilitating the insertion and adjustment of the endoscope 100. More importantly, the multiple circumferentially distributed raised ridges 112 ensure that the endoscope 100 is always in the correct position within the tubular body 10, thereby ensuring the uniformity and consistency of the radial air passage gap formed between the end wall 20 and the lens surface. This provides a crucial structural foundation for generating a stable and controllable gradient flow field, ultimately making the distribution and effect of the clean airflow more precise and reliable.

[0054] The outer end of the protruding rib 112 is connected to the outer end of the protruding rib 22. In this embodiment, by connecting the outer end of the protruding rib 112 to the outer end of the protruding rib 22, the axial flow channel defined by the inner wall of the protruding rib 112 and the radial air path guided by the end wall 20 of the protruding rib 22 achieve precise geometric docking and smooth transition. This structure ensures that the clean gas collected from the annular cavity can be transported undisturbed to the inlet of each radial air path along the channel between the protruding ribs 112, avoiding airflow disturbances such as vortices and throttling caused by flow channel misalignment, significantly reducing flow resistance, and making the gas kinetic energy more efficiently converted into an effective jet for purifying the lens surface, thereby ensuring the stable formation of the gradient flow field and the uniformity of the cleaning effect.

[0055] The width of the convex ridge 112 gradually increases from the end furthest from the first end to the end closest to the first end. In this embodiment, by designing the width of the convex ridge 112 to gradually increase from the end furthest from the first end to the end closest to the first end, the cross-sectional area of ​​the axial flow channel formed by the convex ridge 112 gradually decreases accordingly. According to the principle of fluid continuity, when the cleaning gas flows from the second end to the first end, it is forced to accelerate in this gradually narrowing flow channel, thereby obtaining a higher axial flow velocity before reaching the radial air passage inlet. This pre-acceleration process effectively improves the kinetic energy and directionality of the airflow, enabling it to enter more strongly and concentratedly and be blown toward the lens surface through the radial air passage, enhancing the airflow's resistance to attenuation, and especially ensuring that the airflow reaching the center area of ​​the lens has sufficient scouring intensity, thus optimizing the overall cleaning efficiency.

[0056] Example 3

[0057] Please see Figure 7-9 As shown, the only difference between this embodiment and Embodiment 1 is that:

[0058] The ribs 22 are arranged at circumferential intervals of six along the tubular body 10. The end wall 20 between two adjacent ribs 22 with the second smallest circumferential spacing is recessed in the direction away from the inner cavity of the tubular body 10. This embodiment further divides the radial air path, increasing the overall flow capacity while obtaining high-speed airflow. When the number of ribs 22 increases to six, the smallest radial air path becomes extremely narrow, and its flow capacity is inherently limited. Even if it is thickened by recessing, it is difficult to significantly increase the overall flow rate, and the improvement effect is limited. Therefore, this embodiment chooses to thicken the second smallest air path, which cleverly balances the requirements of high speed and high flow rate. It retains the ability of the smallest air path to generate extremely high local flow velocity to remove stubborn stains, and significantly increases the flow cross-sectional area of ​​this area by widening the second smallest air path. Thus, without excessive loss of flow velocity, the total gas volume and kinetic energy in the central area of ​​the guide lens are improved, ensuring the optimal balance between high speed and coverage of the cleaning effect.

[0059] The technical effects of this utility model will be further explained below based on simulation comparison results:

[0060] Please see Figure 11a , 11b The figures shown are shear stress distribution diagrams of the lens surface under the second experimental conditions for Embodiments 1 and 3 of this utility model, respectively; the specific shear stress distribution data for Embodiments 1 and 3 are shown in the table below:

[0061] Table 2 Comparison of Average Flow Velocity and Average Shear Stress on Lens Surface

[0062]

[0063] Table 2 combined with Figure 11a , 11b It can be seen that, due to the increased number of protrusions in Example 3, the flow channels become narrower, the gas flow rate is greater than that in Example 1, and the area of ​​the high shear stress zone is larger than that in Example 1. In addition, the average velocity of the lens surface in Example 3 is 35.4% greater than that in Example 1, and the average shear stress of the lens surface is 30.7% greater than that in Example 1. Therefore, Example 3 has a better cleaning effect than Example 1.

[0064] The inner tube 121 has a protrusion 1211 on its wall near the end wall 20. The length direction of the protrusion 1211 is parallel to the axis of the inner tube 121, and the protrusion 1211 protrudes at least from the outer wall of the inner tube 121. The protrusion 1211 abuts against the inner wall of the outer tube 122. In this embodiment, by setting an axially parallel protrusion 1211 on the outer wall of the inner tube 121 and abutting against the inner wall of the outer tube 122, precise support and positioning between the inner tube 121 and the outer tube 122 are achieved. This structure ensures that the airflow channel 101 formed between the two tube walls maintains a uniform and consistent gap. This not only effectively prevents the inner tube 121 from tilting or deforming during assembly or under pressure, ensuring the structural stability of the airflow channel 101, but also allows the clean gas to be smoothly delivered to the first section 11 along the preset annular path, avoiding airflow disturbance and pressure loss caused by local narrowing or blockage of the channel. This provides a reliable pre-guarantee for the formation of a uniform and efficient gradient clean flow field at the downstream end.

[0065] The protrusion 1211 protrudes from the inner wall of the inner tube 121. In this embodiment, by having the protrusion 1211 protrude from the inner wall of the inner tube 121 simultaneously, a single structure achieves dual functions. Externally, the protrusion 1211 abuts against the inner wall of the outer tube 122, supporting and positioning the inner and outer tubes 122, ensuring the uniformity and stability of the annular airflow channel 101. Internally, the protrusion 1211 protruding from the inner wall contacts the outer surface of the endoscope 100, providing radial support and centering, ensuring the endoscope 100 is in the correct position within the duct, thereby guaranteeing the uniformity of the radial airflow gap at the end. This not only simplifies the duct structure and reduces manufacturing complexity but also ensures the stability and efficiency of the final clean airflow field from both the airflow delivery and endoscope 100 positioning perspectives.

[0066] In summary, this invention, through the design of the ribs 22, gradually increases the circumferential spacing between adjacent ribs 22 in a certain direction. When the front end of the endoscope 100 abuts against the ribs 22, a radial air path with a gradually changing width is formed between the end wall 20 and the lens. When the cleaning gas enters the radial air path from the annular cavity, significant velocity differences occur at different widths of the air path, with the flow velocity increasing at narrow slits and decreasing at wide slits, thus forming an orderly velocity gradient in the entire circumferential direction. This gradient airflow effectively avoids the problem of a central stagnation zone on the lens surface caused by the collision of airflows at the same velocity. It not only eliminates secondary splashing of contaminants caused by airflow turbulence, but also achieves comprehensive and efficient cleaning of the lens surface by forming a uniform sweeping flow field. The recessed structure 201 significantly increases the thickness of the radial air path at the corresponding position, forming a relatively wide airflow channel 101. The thickened channel allows some gas to have sufficient attenuation redundancy, thereby ensuring that some airflow can reach the lens. The design incorporates a central region, ensuring that the entire lens surface receives sufficient and uniform airflow, overcoming the shortcomings of a single thin-layer air path design and achieving full coverage of the cleaning effect. The six ribs 22 further divide the radial air path, increasing the overall flow capacity while obtaining high-speed airflow. By having the ribs 1211 protrude from the inner wall of the inner tube 121, a single structure simultaneously achieves dual functions. Externally, the ribs 1211 abut against the inner wall of the outer tube 122, supporting and positioning the inner and outer tubes 122, ensuring the uniformity and stability of the annular airflow channel 101. Internally, the ribs 1211 protruding from the inner wall contact the outer surface of the endoscope 100, providing radial support and centering, ensuring that the endoscope 100 is in the correct position of the duct, thereby ensuring the uniformity of the radial air path gap at the end. This not only simplifies the duct structure and reduces manufacturing complexity, but also ensures the stability and efficiency of the final cleaning airflow field from both the airflow delivery and endoscope 100 positioning perspectives.

[0067] The above embodiments are merely illustrative of the principles and effects of this utility model and are not intended to limit the scope of this utility model. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of this utility model. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in this utility model should still be covered by the claims of this utility model.

[0068] Throughout this description, numerous specific details, such as examples of components and / or methods, are provided to provide a complete understanding of embodiments of the present invention. However, those skilled in the art will recognize that embodiments of the present invention may be practiced without one or more of these specific details or by other devices, systems, components, methods, parts, materials, components, etc. In other instances, well-known structures, materials, or operations have not been specifically shown or described in detail to avoid obscuring aspects of embodiments of the present invention.

Claims

1. A medical endoscopic catheter, characterized in that, include: A tubular body (10) has an airflow channel (101) extending axially along the inner wall of the tubular body (10). The airflow channel (101) communicates with the inner cavity of the tubular body (10) at the first end of the tubular body (10), and forms an air inlet for connecting to an air source at the second end of the tubular body (10). An end wall (20) is provided at the first end of the tubular body (10). The end wall (20) has a through hole (21) that penetrates the end wall (20). A rib (22) is provided on the side of the end wall (20) facing the inner cavity of the tubular body (10). The inner end of the rib (22) extends to the edge of the through hole (21), and the outer end of the rib (22) extends to the tube wall of the tubular body (10). A plurality of ribs (22) are spaced apart along the circumference of the tubular body (10). The circumferential spacing between each adjacent rib (22) gradually increases along the clockwise or counterclockwise direction of the circumference of the tubular body (10). The end wall (20) is set at an angle to the axial direction of the tubular body (10), and the two largest spacings between adjacent ribs (22) are set near the operating side of the end wall (20). The operating side is the side of the end wall (20) near the second end of the tubular body (10).

2. The medical endoscopic catheter according to claim 1, characterized in that, The wall surface of the end wall (20) between at least two adjacent ribs (22) is recessed in a direction away from the inner cavity of the tubular body (10).

3. The medical endoscopic catheter according to claim 1, characterized in that, The wall surface of the end wall (20) between the two adjacent ribs (22) with the smallest circumferential spacing or between the two adjacent ribs (22) with the second smallest circumferential spacing is recessed in the direction away from the inner cavity of the tubular body (10).

4. The medical endoscopic catheter according to claim 1, characterized in that, Five ribs (22) are arranged at intervals along the circumference of the tubular body (10). The wall surface of the end wall (20) between the two adjacent ribs (22) with the smallest circumferential spacing is recessed in the direction away from the inner cavity of the tubular body (10), and the recess depth is 0.5mm to 0.6mm.

5. The medical endoscopic catheter according to claim 1, characterized in that, The ribs (22) are arranged at 6 intervals along the circumference of the tubular body (10). The wall surface of the end wall (20) between the two adjacent ribs (22) with the second smallest circumferential spacing is recessed in the direction away from the inner cavity of the tubular body (10), and the recess depth is 0.5mm to 0.6mm.

6. The medical endoscopic catheter according to claim 1, characterized in that, The width of the rib (22) gradually decreases from the outer end to the inner end, and the height of the rib (22) is 0.1mm to 0.3mm.

7. The medical endoscopic catheter according to claim 6, characterized in that, The included angle between the two opposing side walls of the rib (22) in the circumferential direction of the tubular body (10) is less than or equal to 15°.

8. The medical endoscopic catheter according to claim 1, characterized in that, The inner wall of the tubular body (10) near the first end is provided with a protruding ridge (112), the length direction of which is parallel to the axial direction of the tubular body (10).

9. The medical endoscopic catheter according to claim 8, characterized in that, The protruding ridge (112) is connected to the outer end of the protruding rib (22).

10. The medical endoscopic catheter according to claim 9, characterized in that, The width of the protruding ridge (112) gradually increases from the end furthest from the first end to the end closest to the first end.

11. The medical endoscopic catheter according to claim 1, characterized in that, The tubular body (10) includes a first section (11) and a second section (12). The first section (11) is adjacent to the end wall (20), and the second section (12) is connected to the end of the first section (11) away from the end wall (20). The tube wall of the first section (11) is a single-layer structure, and the tube wall of the second section (12) is a double-layer structure. The double-layer tube walls of the second section (12) are spaced apart to form the airflow channel (101).

12. The medical endoscopic catheter according to claim 11, characterized in that, The second section (12) includes an inner tube (121) and an outer tube (122). The inner tube (121) has a protrusion (1211) on one end of its wall near the end wall (20). The length direction of the protrusion (1211) is parallel to the axis of the inner tube (121). The protrusion (1211) protrudes at least from the outer wall of the inner tube (121) and abuts against the inner wall of the outer tube (122).

13. The medical endoscopic catheter according to claim 12, characterized in that, The protrusion (1211) protrudes from the inner wall of the inner tube (121).

14. The medical endoscopic catheter according to claim 12, characterized in that, The first section (11) has a boss (111) at one end away from the end wall (20). A plurality of bosses (111) are arranged circumferentially along the first section (11). The end of the inner tube (121) near the end wall (20) abuts against the boss (111) so that a radial channel (102) is formed between the inner tube (121) and the first section (11) to connect the airflow channel (101) and the inner cavity of the tubular body (10).

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