Drainage catheter and drainage system

Abstract

The invention belongs to the technical field of interventional medical instruments, and provides a drainage catheter and a drainage system.The drainage catheter is provided with a near end and a far end which are oppositely arranged in the axial direction of the drainage catheter, and the far end of the drainage catheter is closed. A plurality of hole groups are formed in the side wall of a tube section, extending from the far end to the near end by a preset distance, of the drainage catheter, the hole groups are arranged at intervals in the axial direction of the drainage catheter, each hole group comprises at least two side holes, and the at least two side holes are arranged at intervals in the circumferential direction of the drainage catheter. In the multiple hole groups, the sum of the hole areas of all the side holes of the hole group closest to the far end is the largest, and the sum of the hole areas of all the side holes of the hole group closest to the near end is the smallest. When the drainage catheter is used for injecting the medicine into the target tissue of the patient, the concentration of the medicine in the axial direction of the drainage catheter is uniform, the treatment effect of the medicine can be improved, and the situation that the medicine damages the target tissue of the patient is avoided as much as possible.

Description

Technical Field

[0001] The present application relates to the technical field of interventional medical devices, and in particular to a drainage catheter and a drainage system. Background Art

[0002] At present, when extracorporeal drainage is performed on patients with diseases such as cerebral hemorrhage or hydrocephalus, if infection occurs, the patient usually needs to be treated with antibacterial drugs, that is, antibiotics and other drugs need to be injected into the patient's ventricles and other tissues. In the process of antibacterial treatment of patients, concentration-dependent drugs (also known as dose-dependent drugs) such as aminoglycosides, fluoroquinolones, metronidazole, and amphotericin B are usually used. The antibacterial efficacy of this type of drug depends on its distribution concentration in the patient's tissue. Specifically, within a certain concentration range, the higher the concentration of this type of drug in the patient's tissue, the better the treatment effect. However, when the concentration of this type of drug in the patient's tissue is too high, it may produce toxic reactions and cause damage to the patient's tissue.

[0003] In the prior art, a drainage catheter is usually used to inject the above-mentioned concentration-dependent drugs into the patient's tissue. The side wall of the drainage catheter is usually provided with a plurality of side holes, and the plurality of side holes are arranged at intervals along the direction from the proximal end to the distal end of the drainage catheter. However, when the above-mentioned drainage catheter is used to inject the drug into the patient's target tissue, the concentration of the drug along the axial direction of the drainage catheter is relatively uneven, which can easily lead to poor therapeutic effect of the drug and may also damage the patient's target tissue. Summary of the invention

[0004] The purpose of the embodiments of the present application is to provide a drainage catheter and a drainage system to solve the technical problem in the prior art that when a drainage catheter is used to inject drugs into a target tissue, the concentration of the drug injected into the target tissue is uneven, which can easily affect the therapeutic effect of the drug and may also damage the patient's target tissue.

[0005] To achieve the above-mentioned purpose, the technical solution adopted in the present application is: to provide a drainage catheter, the drainage catheter having a proximal end and a distal end arranged opposite to each other in the axial direction thereof, wherein the distal end of the drainage catheter is closed, and a plurality of hole groups are provided on the side wall of the tube section of the drainage catheter extending from the distal end to the proximal end at a preset distance, and the plurality of hole groups are arranged at intervals along the axial direction of the drainage catheter, each of the hole groups includes at least two side holes, and at least two of the side holes are arranged at intervals in the circumferential direction of the drainage catheter, and among the plurality of hole groups, the sum of the hole areas of all the side holes of the hole group closest to the distal end is the largest, and the sum of the hole areas of all the side holes of the hole group closest to the proximal end is the smallest.

[0006] In one embodiment, among the multiple hole groups, the sum of the hole areas of all the side holes of the hole group closest to the distal end is 100% to 107% of the cross-sectional area of ​​the drainage channel in the drainage catheter, and the sum of the hole areas of all the side holes of the hole group closest to the proximal end is 60% to 79% of the cross-sectional area of ​​the drainage channel in the drainage catheter.

[0007] In one embodiment, the plurality of hole groups include a first hole group, a second hole group, and a third hole group arranged in sequence from the distal end to the proximal end, the sum of the hole areas of all the side holes of the first hole group is 100% to 107% of the drainage channel in the drainage catheter, the sum of the hole areas of all the side holes of the second hole group is 77% to 93% of the drainage channel in the drainage catheter, and the sum of the hole areas of all the side holes of the third hole group is 70% to 79% of the drainage channel in the drainage catheter.

[0008] In one embodiment, the plurality of hole groups further include a fourth hole group, which is located on a side of the third hole group close to the proximal end, and an opening area of ​​all the side holes of the fourth hole group is 60% to 67% of the drainage channel in the drainage catheter.

[0009] In one embodiment, at least two side holes in the same hole group are evenly spaced apart in the circumferential direction of the drainage catheter.

[0010] In one embodiment, each of the hole groups includes two side holes, and the two side holes of the same hole group are respectively located at two ends of the drainage catheter in a radial direction.

[0011] In one embodiment, the radial directions defined by different hole groups may be the same or the radial directions defined by at least two hole groups may be different.

[0012] In one embodiment, the nominal outer diameter of the drainage catheter is less than 2 mm, and the shortest distance between the geometric centers of any two side holes on the drainage catheter on the outer side wall of the drainage catheter is greater than or equal to 1 mm.

[0013] In one embodiment, the nominal outer diameter of the drainage catheter is greater than or equal to 2 mm and less than or equal to 4 mm, and the shortest distance between the geometric centers of any two side holes on the drainage catheter on the outer wall of the drainage catheter is greater than or equal to 1.8 mm.

[0014] In one embodiment, the nominal outer diameter of the drainage catheter is greater than 4 mm, and the shortest distance between the geometric centers of any two side holes on the drainage catheter on the outer wall of the drainage catheter is greater than or equal to 2.5 mm.

[0015] In one embodiment, the distance from the geometric center of the side hole closest to the proximal end of the drainage catheter to the distal end is 10 mm-30 mm.

[0016] In one embodiment, the outer wall of the drainage catheter further includes at least one hole mark, and the hole mark is used to indicate the position and size of the hole.

[0017] In one embodiment, the hole identification includes a color identification.

[0018] In one embodiment, the hole marker comprises a protrusion or a depression relative to the outer wall of the drainage catheter.

[0019] To achieve the above objectives, the present application also provides a drainage system, which includes a collection container, a drainage tube, and the above-mentioned drainage catheter, wherein the proximal end of the drainage catheter is connected to one end of the drainage tube, and the collection container is connected to the other end of the drainage tube.

[0020] The drainage catheter and drainage system provided by the present application have the following beneficial effects: compared with the prior art, the drainage catheter provided by the present application is provided with a plurality of hole groups on the side wall of the tube section extending from the distal end to the proximal end at a preset distance, each hole group includes at least two side holes, and among the plurality of hole groups, the sum of the hole areas of all the side holes of the hole group closest to the distal end is the largest, and the sum of the hole areas of all the side holes of the hole group closest to the proximal end is the smallest. With such a design, on the one hand, the amount of drug discharged from the hole group closest to the proximal end can be reduced, thereby reducing the amount of drug that settles and diffuses from the position near the proximal end of the opening section to the middle position of the opening section, so that the middle position of the opening section has a suitable drug concentration, and at the same time, the position near the proximal end of the opening section is also maintained at a suitable drug concentration after the diffusion and sedimentation of the drug. On the other hand, the amount of drug discharged from the hole group closest to the distal end can be increased, so that the position near the distal end of the opening section is maintained at a suitable drug concentration, so as to achieve the effect of making the drug concentration at various positions of the entire opening section more uniform, thereby improving the therapeutic effect of the drug and avoiding drug damage to the target tissue of the patient as much as possible.

[0021] Furthermore, since the hole group closest to the proximal end is subject to greater drug outflow pressure and drug load, designing a small-sized hole group can increase the strength of the opening section near the proximal end, while the hole group near the distal end can be designed with a larger size to increase its flow capacity due to its smaller drug load. In this way, the entire drainage catheter has a higher drainage efficiency and a more uniform concentration of discharged drugs, and its structural strength can better meet the requirements of use. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0023] Figure 1 A schematic diagram of the structure of a drainage catheter in a perspective state provided in an embodiment of the present application;

[0024] Figure 2 for Figure 1 A schematic diagram of the structure of the drainage catheter shown;

[0025] Figure 3 A schematic diagram of the structure of another drainage catheter provided in an embodiment of the present application in a perspective state;

[0026] Figure 4 for Figure 3 A schematic diagram of the structure of the drainage catheter shown;

[0027] Figure 5 A schematic diagram of the structure of another drainage catheter provided in an embodiment of the present application in a perspective state;

[0028] Figure 6 for Figure 5 A schematic diagram of the structure of the drainage catheter shown;

[0029] Figure 7 A schematic diagram of the structure of another drainage catheter provided in an embodiment of the present application in a perspective state;

[0030] Figure 8 for Figure 7 A schematic diagram of the structure of the drainage catheter shown;

[0031] Fig. 9 A schematic diagram of the structure of another drainage catheter provided in an embodiment of the present application in a perspective state;

[0032] Fig.10 for Fig. 9 A schematic diagram of the structure of the drainage catheter shown;

[0033] Fig.11 A schematic diagram of the structure of another drainage catheter provided in an embodiment of the present application in a perspective state;

[0034] Fig.12 for Fig.11 A schematic diagram of the structure of the drainage catheter shown;

[0035] Fig.13 for Figures 1 to 10A schematic diagram of the ratio of peak concentration to minimum inhibitory concentration of the drainage catheter shown;

[0036] Fig.14 A schematic diagram of the structure of a drainage system provided in an embodiment of the present application.

[0037] Among them, the reference numerals in the figure are:

[0038] 10-drainage catheter; 11-distal end; 12-proximal end; 100-drainage channel; 200-hole group; 201-side hole; 210-first hole group; 220-second hole group; 230-third hole group; 240-fourth hole group; 300-hole identification;

[0039] 20-drainage tube;

[0040] 30-collection container;

[0041] 40-Three-way valve. DETAILED DESCRIPTION

[0042] Embodiments of the present application are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present application, and should not be construed as limiting the present application.

[0043] In the description of the present application, it should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0044] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0045] Reference throughout the specification to "one embodiment" or "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment of the present application. Thus, when the phrases "in one embodiment" or "in some embodiments" appear in various places throughout the specification, not all references are to the same embodiment. Furthermore, in one or more embodiments, the particular features, structures, or characteristics may be combined in any suitable manner.

[0046] In the related art, a drainage catheter is usually provided with a plurality of side holes on the side wall of a tube section extending from the distal end to the proximal end of the drainage catheter at a preset distance. The plurality of side holes are arranged at intervals along the direction from the distal end to the proximal end of the drainage catheter and have the same opening area. When the distal end of the drainage catheter having the above structure is inserted into the target tissue of the patient and the drug is injected into the target tissue of the patient from the proximal end of the drainage catheter, the amount of drug discharged from the side hole closest to the proximal end is much greater than the amount of drug discharged from the side hole closest to the distal end, the amount of drug discharged from the side hole in the middle of the opening section is between the amount of drug discharged from the side hole closest to the proximal end and the amount of drug discharged from the side hole closest to the distal end, and a larger portion of the drug discharged from the side hole closest to the proximal end will flow into the opening. In this way, in the middle of the opening section, there will be both drugs discharged from the middle side holes and drugs diffused and settled to the middle from the proximal end of the opening section, which often leads to a higher drug concentration in the middle of the opening section, thereby causing damage to the target tissue of the patient; while in the distal end of the opening section, there are only a small amount of drugs discharged from the side holes closest to the distal end and a small amount of drugs diffused and settled from the middle of the opening section, which often leads to a lower drug concentration near the distal end of the opening section, thereby affecting the therapeutic effect of the drug.

[0047] To solve the above problems, see Figure 1 and Figure 2 The embodiment of the present application provides a drainage catheter 10, and the drainage catheter 10 provided by the embodiment of the present application is now described. The drainage catheter 10 has a distal end 11 and a proximal end 12 arranged opposite to each other in the axial direction thereof, wherein the distal end 11 of the drainage catheter 10 is closed. The side wall of the tube section of the drainage catheter 10 extending from the distal end 11 to the proximal end 12 at a preset distance is provided with a plurality of hole groups 200, and the plurality of hole groups 200 are arranged at intervals along the axial direction of the drainage catheter 10, and each hole group 200 includes at least two side holes 201, and at least two side holes 201 are arranged at intervals in the circumferential direction of the drainage catheter 10. Among the plurality of hole groups 200, the sum of the hole areas of all the side holes 201 of the hole group 200 closest to the distal end 11 is the largest, and the sum of the hole areas of all the side holes 201 of the hole group 200 closest to the proximal end 12 is the smallest.

[0048] Specifically, the drainage catheter 10 is a tubular structure and can be made of silicone elastomer or rubber. The distal end 11 and the proximal end 12 of the drainage catheter 10 are two opposite ends of the drainage catheter 10 in the axial direction. The distal end 11 of the drainage catheter 10 is closed and can be inserted into the patient's cerebral ventricle, abdominal cavity and other target tissues. Fig.14 The proximal end 12 of the drainage catheter 10 can be connected to a collection container 30, a drug delivery device, a suction pump and other devices outside the patient's body through a drainage tube 20. When the proximal end 12 of the drainage catheter 10 and the output end of the drug delivery device are connected to each other, the drainage catheter 10 can be used to inject drugs into the patient's target tissue; when the proximal end 12 of the drainage catheter 10 and the suction pump and the collection container 30 outside the patient's body are connected to each other in sequence, the drainage catheter 10 can be used to suck the gas and / or liquid in the patient's target tissue into the collection container 30.

[0049] Furthermore, the number of hole groups 200 on the drainage catheter 10 may be two or more, and the plurality of hole groups 200 may be evenly or unevenly spaced along the axial direction of the drainage catheter 10. It is understood that when the number of hole groups 200 on the drainage catheter 10 is two, the sum of the hole areas of all the side holes 201 of the hole group 200 close to the distal end 11 is greater than the sum of the hole areas of all the side holes 201 of the hole group 200 close to the proximal end 12, which is not shown in the figure. Figures 1 to 4 When there are three hole groups 200 on the drainage catheter 10, the sum of the hole areas of all the side holes 201 of each hole group 200 gradually decreases in the direction from the distal end 11 to the proximal end 12 of the drainage catheter 10. In other words, the sum of the hole areas of all the side holes 201 of the hole group 200 closest to the distal end 11 is the largest, the sum of the hole areas of all the side holes 201 of the middle hole group 200 is the second largest, and the sum of the hole areas of all the side holes 201 of the hole group 200 closest to the proximal end 12 is the smallest. Figures 5 to 10 When the number of hole groups 200 on the drainage catheter 10 is greater than or equal to four groups, it is only necessary to ensure that the sum of the hole areas of all the side holes 201 of the hole group 200 closest to the distal end 11 is the largest, and the sum of the hole areas of all the side holes 201 of the hole group 200 closest to the proximal end 12 is the smallest. The sum of the hole areas of all the side holes 201 of the middle hole groups 200 in the direction from the distal end 11 to the proximal end 12 of the drainage catheter 10 can gradually decrease, gradually increase, first increase or decrease, first decrease and then increase, or be equal.

[0050] For any hole group 200 on the drainage catheter 10, the number of side holes 201 can be two or more, and the multiple side holes 201 can be evenly or unevenly spaced along the circumference of the drainage catheter 10. The shape of the side hole 201 can be a circular hole, an elliptical hole, a shuttle hole or a polygonal hole, etc., with regular or irregular shapes. The shapes and areas of different side holes 201 can be the same or different. In addition, it should be noted that for the same side hole 201, when the area of ​​the hollowed-out area on the outer wall of the drainage catheter 10 and the area of ​​the hollowed-out area on the inner wall of the drainage catheter 10 are different after the side hole 201 is cut and formed, the area of ​​the hollowed-out area on the inner wall of the drainage catheter 10 is used as the hole area of ​​the side hole 201.

[0051] For any two different hole groups 200 on the drainage catheter 10, the number of side holes 201 can be the same or different, and the arrangement of the side holes 201 along the axial direction of the drainage catheter 10, such as whether they are evenly arranged, can be the same or different; the shapes of the side holes 201 can also be the same or different.

[0052] For example, see Figures 1 to 4 The drainage catheter 10 is made of silicone elastomer, and three hole groups 200 are arranged on the drainage catheter 10. The three hole groups 200 are evenly spaced along the axial direction of the drainage catheter 10. Each hole group 200 includes two side holes 201, and the two side holes 201 of the same hole group 200 are evenly spaced along the circumference of the drainage catheter 10. Of course, the material of the drainage catheter 10, the number of hole groups 200, the arrangement of multiple hole groups 200 along the axial direction of the drainage catheter 10, the number of side holes 201 of a single hole group 200, the arrangement of the side holes 201 of a single hole group 200 in the circumferential direction of the drainage catheter 10, the shape of the side holes 201, etc. can be set as needed, and this embodiment does not make a unique limitation on the above parameters.

[0053] The drainage catheter 10 provided in the present embodiment is provided with a plurality of hole groups 200 on the side wall of the tube section extending from the distal end 11 to the proximal end 12 at a preset distance, each hole group 200 includes at least two side holes 201, and among the plurality of hole groups 200, the sum of the hole areas of all the side holes 201 of the hole group 200 closest to the distal end 11 is the largest, and the sum of the hole areas of all the side holes 201 of the hole group 200 closest to the proximal end 12 is the smallest. Compared with the related art, such a design can, on the one hand, reduce the amount of medicine discharged from the hole group 200 closest to the proximal end 12, thereby reducing the amount of medicine discharged from the hole section close to the proximal end 12. 2, so that the middle position of the opening section has a suitable drug concentration. At the same time, the position of the opening section near the proximal end 12 is also maintained at a suitable drug concentration after the diffusion and sedimentation of the drug. On the other hand, the amount of drug discharged from the hole group 200 closest to the distal end 11 can be increased, so that the position of the opening section near the distal end 11 maintains a suitable drug concentration, thereby achieving a more uniform drug concentration at various positions of the entire opening section, thereby improving the therapeutic effect of the drug and avoiding drug damage to the patient's target tissue as much as possible.

[0054] Furthermore, since the hole group 200 closest to the proximal end 12 is subjected to greater drug outflow pressure and drug load, designing a small-sized hole group 200 can increase the strength of the opening section near the proximal end 12, while the hole group 200 near the distal end 11 can be designed with a larger size to increase its flow capacity due to its smaller drug load. In this way, the entire drainage catheter 10 has a higher drainage efficiency and a more uniform concentration of discharged drugs, and its structural strength can better meet usage requirements.

[0055] In addition, since the drainage catheter 10 provided in this embodiment has each hole group 200 including at least two side holes 201, and at least two side holes 201 are arranged at intervals along the circumference of the drainage catheter 10, such a design can also increase the uniformity of the drug in the circumferential direction of the drainage catheter 10, which is beneficial to further enhance the therapeutic effect of the drug and minimize drug damage to the patient's target tissue.

[0056] In one embodiment, see Figures 1 to 10 Among the multiple hole groups 200, the sum of the hole areas of all the side holes 201 of the hole group 200 closest to the distal end 11 is 100% to 107% of the cross-sectional area of ​​the drainage channel 100 in the drainage catheter 10, and the sum of the hole areas of all the side holes 201 of the hole group 200 closest to the proximal end 12 is 60% to 79% of the cross-sectional area of ​​the drainage channel 100 in the drainage catheter 10.

[0057] Specifically, the sum of the hole areas of all the side holes 201 of the hole group 200 closest to the distal end 11 may be 100%, 101%, 102%, 103%, 104%, 105%, 106% or 107% of the cross-sectional area of ​​the drainage channel 100 in the drainage catheter 10. Preferably, the sum of the hole areas of all the side holes 201 of the hole group 200 closest to the distal end 11 may be 104%-107% or 100%-104% of the cross-sectional area of ​​the drainage channel 100 in the drainage catheter 10.

[0058] Specifically, the sum of the hole areas of all the side holes 201 of the hole group 200 closest to the proximal end 12 is 60%, 62%, 67%, 68%, 70%, 72%, 76%, 79%, etc. of the cross-sectional area of ​​the drainage channel 100 in the drainage catheter 10. Preferably, the sum of the hole areas of all the side holes 201 of the hole group 200 closest to the proximal end 12 may be 60%-67% or 70%-79% of the cross-sectional area of ​​the drainage channel 100 in the drainage catheter 10.

[0059] The drainage catheter 10 provided in this embodiment, on the one hand, sets the sum of the hole areas of all the side holes 201 of the hole group 200 close to the distal end 11 to 100% to 107% of the cross-sectional area of ​​the drainage channel 100 in the drainage catheter 10. In other words, the sum of the hole areas of all the side holes 201 of the hole group 200 closest to the distal end 11 is set to be approximately equal to the cross-sectional area of ​​the drainage channel 100 in the drainage catheter 10, which can prevent foreign objects with a large cross-sectional area of ​​the drainage channel 100 in the drainage catheter 10 from entering the drainage channel 100 as much as possible, thereby preventing foreign objects from clogging the drainage channel 100 as much as possible; on the other hand, setting the sum of the hole areas of all the side holes 201 of the hole group 200 closest to the proximal end 12 to 60% to 79% of the cross-sectional area of ​​the drainage channel 100 in the drainage catheter 10 can prevent the sum of the hole areas of all the side holes 201 of the hole group 200 from being too small, so that the drainage catheter 10 as a whole maintains a good drainage efficiency.

[0060] In one embodiment, see Figures 2 to 4 The plurality of hole groups 200 include a first hole group 210, a second hole group 220, and a third hole group 230 which are sequentially arranged in a direction from the distal end 11 to the proximal end 12. The sum of the hole areas of all the side holes 201 of the first hole group 210 is 100% to 107% of the cross-sectional area of ​​the drainage channel 100 in the drainage catheter 10, the sum of the hole areas of all the side holes 201 of the second hole group 220 is 77% to 93% of the drainage channel 100 in the drainage catheter 10, and the sum of the hole areas of all the side holes 201 of the third hole group 230 is 70% to 79% of the drainage channel 100 in the drainage catheter 10.

[0061] In this embodiment, the first hole group 210 is the hole group 200 closest to the distal end 11, and the sum of the hole areas of all the side holes 201 thereof may be 100%, 101%, 102%, 103%, 104%, 105%, 106% or 107% of the cross-sectional area of ​​the drainage channel 100 in the drainage catheter 10. Preferably, the sum of the hole areas of all the side holes 201 in the first hole group 210 is 100%-104% or 104%-107% of the cross-sectional area of ​​the drainage channel 100 in the drainage catheter 10.

[0062] The second hole group 220 serves as the middle hole group 200 of the drainage catheter 10, and the sum of the hole areas of all the side holes 201 thereof may be 77%, 78%, 79%, 81%, 82%, 83%, 85%, 88%, 89% or 93% of the cross-sectional area of ​​the drainage channel 100 in the drainage catheter 10. Preferably, the sum of the hole areas of all the side holes 201 in the second hole group 220 is 77%-82% or 81%-93% of the cross-sectional area of ​​the drainage channel 100 in the drainage catheter 10.

[0063] The third hole group 230 is the hole group 200 closest to the proximal end 12 of the drainage catheter 10, and the sum of the hole areas of all the side holes 201 thereof may be 70%, 72%, 75%, 76% or 79% of the cross-sectional area of ​​the drainage channel 100 in the drainage catheter 10. In this embodiment, since the third hole group 230 is closest to the proximal end 12, the hole areas of all the side holes 201 in the third hole group 230 are smaller than the sum of the hole areas of all the side holes 201 in the second hole group 220 within the above range. Preferably, the sum of the hole areas of all the side holes 201 in the third hole group 230 is 70%-72% or 72%-79% of the cross-sectional area of ​​the drainage channel 100 in the drainage catheter 10.

[0064] See also Figures 2 to 4 as well as Fig.13 In order to illustrate the effect and principle of the drainage catheter 10 provided in this embodiment, this embodiment also adopts two specific drainage catheters 10 to inject drugs into the simulated cerebrospinal fluid, and detects the concentration of the drug at a position close to the proximal end 12, a position close to the distal end 11, and a middle position between the proximal end 12 and the distal end 11 in the axial direction of the drainage catheter 10.

[0065] See also Figure 1 and Figure 2In one implementation, the sum of the hole areas of all the side holes 201 of the first hole group 210 is 107% of the cross-sectional area of ​​the drainage channel 100 in the drainage catheter 10, the sum of the hole areas of all the side holes 201 of the second hole group 220 is 77% of the cross-sectional area of ​​the drainage channel 100 in the drainage catheter 10, and the sum of the hole areas of all the side holes 201 of the third hole group 230 is 70% of the cross-sectional area of ​​the drainage channel 100 in the drainage catheter 10. The first hole group 210, the second hole group 220, and the third hole group 230 each include two side holes 201 located at both ends of the radial direction of the drainage catheter 10, the radial direction of the two side holes 201 of the first hole group 210 is parallel to the radial direction of the two side holes 201 of the second hole group 220, and the radial direction of the two side holes 201 of the third hole group 230 is perpendicular to the radial direction of the two side holes 201 of the second hole group 220. Please refer to Fig.13 In scheme 1, "upper" in the figure represents the drug concentration at a position close to the proximal end 12 on the opening section of the drainage catheter 10, "middle" represents the drug concentration at a middle position of the opening section of the drainage catheter 10, and "lower" represents the drug concentration at a position close to the distal end 11 on the opening section of the drainage catheter 10. When the above-mentioned drainage catheter 10 is used to inject drugs into the simulated cerebrospinal fluid of the patient, at various positions along the axial direction of the drainage catheter 10, the ratio between the peak concentration Cmax and the minimum inhibitory concentration (MIC) of the drug is relatively close, and both are between 7 and 14. While having a good antibacterial effect, it can minimize the damage to the target tissue caused by high concentration.

[0066] See also Figure 3 and Figure 4 In another implementation, the sum of the hole areas of all the side holes 201 of the first hole group 210 is 104% of the cross-sectional area of ​​the drainage channel 100 in the drainage catheter 10, the sum of the hole areas of all the side holes 201 of the second hole group 220 is 82% of the cross-sectional area of ​​the drainage channel 100 in the drainage catheter 10, and the sum of the hole areas of all the side holes 201 of the third hole group 230 is 70% of the cross-sectional area of ​​the drainage channel 100 in the drainage catheter 10; the first hole group 210, the second hole group 220 and the third hole group 230 all include two side holes 201 located at both ends of the radial direction of the drainage catheter 10, the radial direction of the two side holes 201 of the first hole group 210 is perpendicular to the radial direction of the two side holes 201 of the second hole group 220, and the radial direction of the two side holes 201 of the third hole group 230 is perpendicular to the radial direction of the two side holes 201 of the second hole group 220. Please refer to Fig.13In scheme 2, when the above-mentioned drainage catheter 10 is used to inject the drug into the target tissue of the patient, the ratio between the peak concentration Cmax and the minimum inhibitory concentration MIC of the drug at various positions along the axial direction of the drainage catheter 10 is relatively close, and both are between 9 and 14. While having a good antibacterial effect, it can also minimize the damage to the target tissue caused by high concentration.

[0067] The drainage catheter 10 provided in this embodiment limits the sum of the hole areas of all the side holes 201 of the first hole group 210, the sum of the hole areas of all the side holes 201 of the second hole group 220, and the sum of the hole areas of all the side holes 201 of the third hole group 230 to 100% to 107%, 77% to 93%, and 70% to 79% of the cross-sectional area of ​​the inner drainage channel 100, respectively. The drug concentrations at the position of the opening section of the drainage catheter 10 close to the proximal end 12, the middle position of the opening section, and the position of the opening section close to the distal end 11 can be more accurately controlled, respectively, which is conducive to making the drug concentration at various positions of the entire opening section more uniform, thereby improving the therapeutic effect of the drug and avoiding drug damage to the patient's target tissue as much as possible.

[0068] Furthermore, the first hole group 210, the second hole group 220 and the third hole group 230 can cover a longer range in the axial direction of the drainage catheter 10, so that the drug can be injected into the patient's target tissue in a more dispersed manner, and it is also beneficial to make the concentration of the drug along the axial direction of the drainage catheter 10 more uniform, thereby improving the therapeutic effect of the drug and minimizing the damage of the drug to the patient's target tissue.

[0069] In addition, the drainage catheter 10 provided in this embodiment has three hole groups 200, and the number of hole groups 200 is relatively small, which is conducive to reducing the processing difficulty of the drainage catheter 10 and reducing the production cost of the drainage catheter 10; it can also minimize the impact of the openings on the structural strength of the drainage catheter 10 while improving the uniformity of drug concentration, thereby ensuring the service life and safety of the drainage catheter 10.

[0070] In one embodiment, see Figures 5 to 10 The plurality of hole groups 200 further include a fourth hole group 240 , which is located on a side of the third hole group 230 close to the proximal end 12 , and an opening area of ​​all side holes 201 of the fourth hole group 240 is 60% to 67% of the drainage channel 100 in the drainage catheter 10 .

[0071] Specifically, the sum of the hole areas of all the side holes 201 of the fourth hole group 240 is 60%, 61%, 62%, 63%, 64% or 67% of the cross-sectional area of ​​the drainage channel 100 in the drainage catheter 10. Preferably, the sum of the hole areas of all the side holes 201 of the fourth hole group 240 can be 60%-62% or 62%-67% of the cross-sectional area of ​​the drainage channel 100 in the drainage catheter 10.

[0072] It should be noted that, in the present embodiment, the fourth hole group 240 is the hole group 200 closest to the proximal end 12, rather than the third hole group 230 being the hole group 200 closest to the proximal end 12. Therefore, in the present embodiment, it is only necessary to satisfy that the hole area of ​​all side holes 201 of the first hole group 210 closest to the distal end 11 is the largest, and the hole area of ​​all side holes 201 of the fourth hole group 240 closest to the proximal end 12 is the smallest. The sum of the hole areas of all side holes 201 of the third hole group 230 may be greater than, less than or equal to the sum of the hole areas of all side holes 201 of the second hole group 220, that is, the sum of the hole areas of all side holes 201 of the third hole group 230 does not necessarily have to be less than the sum of the hole areas of all side holes 201 of the second hole group 220. Preferably, in the direction from the distal end 11 to the proximal end 12 of the drainage catheter 10 , the sum of the hole areas of all the side holes 201 of the first hole group 210 , the second hole group 220 , the third hole group 230 and the fourth hole group 240 increases sequentially.

[0073] See also Figures 5 to 10 In order to illustrate the effect and principle of the drainage catheter 10 provided in this embodiment, this embodiment also adopts three specific drainage catheters 10 to inject drugs into the simulated cerebrospinal fluid, and detects the concentration of the drug at a position close to the proximal end 12, a position close to the distal end 11, and a middle position between the proximal end 12 and the distal end 11 in the axial direction of the drainage catheter 10.

[0074] See also Figure 5 and Figure 6 In one implementation, the sum of the hole areas of all the side holes 201 of the first hole group 210 is 100% of the cross-sectional area of ​​the drainage channel 100 in the drainage catheter 10, the sum of the hole areas of all the side holes 201 of the second hole group 220 is 93% of the cross-sectional area of ​​the drainage channel 100 in the drainage catheter 10, the sum of the hole areas of all the side holes 201 of the third hole group 230 is 76% of the cross-sectional area of ​​the drainage channel 100 in the drainage catheter 10, and the sum of the hole areas of all the side holes 201 of the fourth hole group 240 is 60% of the cross-sectional area of ​​the drainage channel 100 in the drainage catheter 10. The first hole group 210, the second hole group 220, the third hole group 230 and the fourth hole group 240 all include two side holes 201 located at both ends of the radial direction of the drainage catheter 10, the radial direction of the two side holes 201 of the first hole group 210 is parallel to the radial direction of the two side holes 201 of the second hole group 220, the radial direction of the two side holes 201 of the third hole group 230 is perpendicular to the radial direction of the two side holes 201 of the second hole group 220, and the radial direction of the two side holes 201 of the fourth hole group 240 is perpendicular to the radial direction of the two side holes 201 of the third hole group 230, see Fig.13In scheme 3, when the drainage catheter 10 is used to inject drugs into the simulated cerebrospinal fluid of the patient, the ratios between the peak concentration Cmax and the minimum inhibitory concentration MIC of the drug at various positions along the axial direction of the drainage catheter 10 are relatively close, and are both between 9.5 and 13.5. While having a good antibacterial effect, it can minimize the damage to the target tissue caused by high concentrations.

[0075] See also Figure 7 and Figure 8 In another implementation, the sum of the hole areas of all the side holes 201 of the first hole group 210 is 100% of the cross-sectional area of ​​the drainage channel 100 in the drainage catheter 10, the sum of the hole areas of all the side holes 201 of the second hole group 220 is 88% of the cross-sectional area of ​​the drainage channel 100 in the drainage catheter 10, the sum of the hole areas of all the side holes 201 of the third hole group 230 is 79% of the cross-sectional area of ​​the drainage channel 100 in the drainage catheter 10, and the sum of the hole areas of all the side holes 201 of the fourth hole group 240 is 62% of the cross-sectional area of ​​the drainage channel 100 in the drainage catheter 10. The first hole group 210, the second hole group 220, the third hole group 230 and the fourth hole group 240 all include two side holes 201 located at both ends of the radial direction of the drainage catheter 10, the radial direction of the two side holes 201 of the first hole group 210 is perpendicular to the radial direction of the two side holes 201 of the second hole group 220, the radial direction of the two side holes 201 of the third hole group 230 is perpendicular to the radial direction of the two side holes 201 of the second hole group 220, and the radial direction of the two side holes 201 of the fourth hole group 240 is perpendicular to the radial direction of the two side holes 201 of the third hole group 230, see Fig.13 In scheme 4, when the drainage catheter 10 is used to inject drugs into the simulated cerebrospinal fluid of the patient, the ratios between the peak concentration Cmax and the minimum inhibitory concentration MIC of the drug at various positions along the axial direction of the drainage catheter 10 are relatively close, and are both between 7 and 15. While having a good antibacterial effect, it can minimize the damage to the target tissue caused by high concentrations.

[0076] See also Fig. 9 and Fig.10In another implementation, the sum of the hole areas of all the side holes 201 of the first hole group 210 is 100% of the cross-sectional area of ​​the drainage channel 100 in the drainage catheter 10, the sum of the hole areas of all the side holes 201 of the second hole group 220 is 81% of the cross-sectional area of ​​the drainage channel 100 in the drainage catheter 10, the sum of the hole areas of all the side holes 201 of the third hole group 230 is 72% of the cross-sectional area of ​​the drainage channel 100 in the drainage catheter 10, and the sum of the hole areas of all the side holes 201 of the fourth hole group 240 is 67% of the cross-sectional area of ​​the drainage channel 100 in the drainage catheter 10. The first hole group 210, the second hole group 220, the third hole group 230 and the fourth hole group 240 all include two side holes 201 located at both ends of the radial direction of the drainage catheter 10, the radial direction of the two side holes 201 of the first hole group 210 is parallel to the radial direction of the two side holes 201 of the second hole group 220, the radial direction of the two side holes 201 of the third hole group 230 is parallel to the radial direction of the two side holes 201 of the second hole group 220, and the radial direction of the two side holes 201 of the fourth hole group 240 is perpendicular to the radial direction of the two side holes 201 of the third hole group 230, see Fig.13 In scheme 5, when the drainage catheter 10 is used to inject drugs into the simulated cerebrospinal fluid of the patient, the ratios between the peak concentration Cmax and the minimum inhibitory concentration MIC of the drug at various positions along the axial direction of the drainage catheter 10 are relatively close, and are both between 7 and 13.5. While having a good antibacterial effect, it can minimize the damage to the target tissue caused by high concentrations.

[0077] The drainage catheter 10 provided in this embodiment, on the one hand, makes the drug concentration at each location of the opening section of the drainage catheter 10 more uniform by reasonably designing the size of the sum of the hole areas of all the side holes 201 of each hole group 200, and on the other hand, controls the number of hole groups 200 so that the number of hole groups 200 is increased to four groups. When the length of the opening section is constant, the four groups of hole groups 200 can be more densely distributed in the axial direction of the drainage catheter 10. The four groups of hole groups 200 can provide more drug outflow points, so that the drug is more evenly distributed in the area around the drainage catheter 10, and the drug can enter the target area more evenly during the drainage process, which is beneficial to further improve the concentration uniformity of the drug along the axial direction of the drainage catheter 10, improve the therapeutic effect of the drug, and minimize the drug damage to the patient's target tissue.

[0078] Furthermore, the first hole group 210, the second hole group 220, the third hole group 230 and the fourth hole group 240 enable the drug to be injected into the patient's target tissue in a more dispersed manner, which is beneficial to further improve the uniformity of the drug concentration along the axial direction of the drainage catheter 10, improve the therapeutic effect of the drug, and minimize the drug damage to the patient's target tissue.

[0079] In one embodiment, at least two side holes 201 of the same hole group 200 are evenly spaced and arranged in the circumferential direction of the drainage catheter 10. For example, when the same hole group 200 includes three side holes 201, the three side holes 201 are evenly arranged in the same circumferential direction of the drainage catheter 10, that is, two adjacent side holes 201 are 120° apart from the circumferential direction of the drainage catheter 10. For another example, when the same hole group 200 includes four side holes 201, two of the four side holes 201 are respectively located at the two ends of one radial direction of the drainage catheter 10, and the other two of the four side holes 201 are respectively located at the two ends of another radial direction of the drainage catheter 10, and the above two radial directions are perpendicular to each other, which is not shown in the figure.

[0080] The drainage catheter 10 provided in this embodiment has multiple side holes 201 of the same hole group 200 evenly spaced in the circumferential direction thereof, which is conducive to making the concentration of the drug in the circumferential direction of the drainage catheter 10 more uniform, thereby improving the therapeutic effect of the drug and minimizing drug damage to the patient's target tissue.

[0081] In one embodiment, each hole group 200 includes at least two side holes 201, and the opening areas of at least two side holes 201 of the same hole group 200 are equal. This is beneficial to make the concentration of the drug more uniform in the circumferential direction of the drainage catheter 10, thereby improving the therapeutic effect of the drug and minimizing the damage of the drug to the target tissue of the patient.

[0082] In one embodiment, see Figure 1 Each hole group 200 includes two side holes 201, and the two side holes 201 of the same hole group 200 are respectively located at the two ends of the radial direction of the drainage catheter 10. In this way, when the drug flows from the proximal end 12 of the drainage catheter 10 to the position of a certain hole group 200, a drug flow will flow into the patient's target tissue from one of the side holes 201 of the hole group 200, and another drug flow will flow into the patient's target tissue from another side hole 201 of the hole group 200. In this way, the flow directions of the above two drug flows form an angle of 180°, which is conducive to making the concentration of the drug flowing into the patient's target tissue in the circumferential direction of the drainage catheter 10 more uniform, thereby improving the therapeutic effect of the drug and avoiding the drug from damaging the patient's target tissue as much as possible.

[0083] In one embodiment, among the multiple hole groups 200, the radial directions determined by different hole groups 200 are the same. This situation is not shown in the figure. It can be understood that the radial direction referred to in this embodiment is the radial direction of the drainage catheter 10. The radial directions determined by different hole groups 200 are the same, that is, the radial directions determined by different hole groups 200 are parallel to each other in space. For example, when the drainage catheter 10 is provided with the first hole group 210, the second hole group 220 and the third hole group 230, the radial directions of the two side holes 201 of the first hole group 210, the radial directions of the two side holes 201 of the second hole group 220 and the radial directions of the two side holes 201 of the third hole group 230 are all parallel to each other. In this way, the opening directions of all the hole groups 200 are the same, which is conducive to opening holes on the drainage catheter 10 without rotating the drainage catheter 10, which is conducive to reducing the processing difficulty of the drainage catheter 10 and reducing the production cost of the drainage catheter 10.

[0084] In one embodiment, see Figures 1 to 10 , among the plurality of hole groups 200, at least two hole groups 200 have different radial directions. In other words, among the plurality of hole groups 200, the radial directions of some hole groups 200 are parallel to each other in space, while the radial directions of other hole groups 200 are not parallel to each other in space, nor do they overlap, but are in a non-planar intersecting relationship. For example, see Figure 5 When the drainage catheter 10 is provided with the first hole group 210, the second hole group 220, the third hole group 230 and the fourth hole group 240, the radial direction of the two side holes 201 of the first hole group 210 and the radial direction of the two side holes 201 of the second hole group 220 are parallel to each other, the radial direction of the two side holes 201 of the third hole group 230 and the radial direction of the two side holes 201 of the second hole group 220 are skewed, and the radial direction of the two side holes 201 of the fourth hole group 240 and the radial direction of the two side holes 201 of the third hole group 230 are skewed.

[0085] Preferably, any two adjacent hole groups 200 have different radial directions, for example, see Figure 7 When the first hole group 210, the second hole group 220, the third hole group 230 and the fourth hole group 240 are provided on the drainage catheter 10, the radial direction of the two side holes 201 of the first hole group 210 and the radial direction of the two side holes 201 of the second hole group 220 are perpendicular to each other, the radial direction of the two side holes 201 of the third hole group 230 and the radial direction of the two side holes 201 of the second hole group 220 are perpendicular to each other, and the radial direction of the two side holes 201 of the fourth hole group 240 and the radial direction of the two side holes 201 of the third hole group 230 are perpendicular to each other. In this way, the side holes 201 of any two adjacent hole groups 200 can be arranged in a staggered manner, which is conducive to further improving the uniformity of the drug in the circumferential direction of the drainage catheter 10.

[0086] In the drainage catheter 10 provided in this embodiment, among the multiple hole groups 200, at least two hole groups 200 have different radial directions, so that the drug can flow into the patient's target tissue along at least two different directions (i.e., two skew-intersecting radial directions), which is beneficial to improving the uniformity of the drug in the circumferential direction of the drainage catheter 10, thereby improving the therapeutic effect of the drug and minimizing the risk of drug damage to the patient's target tissue.

[0087] In one embodiment, the nominal outer diameter of the drainage catheter 10 is less than 2 mm, and the shortest distance between the geometric centers of any two side holes 201 on the drainage catheter 10 on the outer wall of the drainage catheter 10 is greater than or equal to 1 mm.

[0088] Specifically, the nominal outer diameter of the drainage catheter 10 can be set to 1 mm, 1.5 mm, 1.6 mm, 1.7 mm, 1.8 mm, 1.9 mm, 2 mm, etc. When the nominal outer diameter of the drainage catheter 10 is set to the above value, the shortest distance between the geometric centers of any two side holes 201 on the drainage catheter 10 on the outer side wall of the drainage catheter 10 can be set to 1 mm, 1.1 mm, 1.2 mm, 1.5 mm or 2 mm, etc. It can be set as needed.

[0089] Such a configuration can ensure the structural strength of the drainage catheter 10 as much as possible, so that the minimum breaking stress of the drainage catheter 10 can reach 5 N. The service life of the drainage catheter 10 can be prolonged, and the drainage catheter 10 can be prevented from breaking during use as much as possible.

[0090] In one embodiment, the nominal outer diameter of the drainage catheter 10 is greater than or equal to 2 mm and less than or equal to 4 mm, and the shortest distance between the geometric centers of any two side holes 201 on the drainage catheter 10 on the outer wall of the drainage catheter 10 is greater than or equal to 1.8 mm.

[0091] Specifically, the nominal outer diameter of the drainage catheter 10 can be set to 2 mm, 2.5 mm, 3 mm, 3.5 mm or 4 mm, etc. When the nominal outer diameter of the drainage catheter 10 is set to the above value, the shortest distance between the geometric centers of any two side holes 201 on the drainage catheter 10 on the outer side wall of the drainage catheter 10 can be set to 1.8 mm, 1.9 mm, 2 mm, 2.5 mm or 4 mm, etc. It can be set as needed.

[0092] Such a configuration can ensure the structural strength of the drainage catheter 10 as much as possible, so that the minimum breaking stress of the drainage catheter 10 can reach 10N, which can prolong the service life of the drainage catheter 10 and avoid the drainage catheter 10 from breaking during use as much as possible.

[0093] In one embodiment, the nominal outer diameter of the drainage catheter 10 is greater than 4 mm, and the shortest distance between the geometric centers of any two side holes 201 on the drainage catheter 10 on the outer wall of the drainage catheter 10 is greater than or equal to 2.5 mm.

[0094] Specifically, the nominal outer diameter of the drainage catheter 10 can be set to 4 mm, 5 mm, 5.5 mm, 6 mm or 10 mm, etc. When the nominal outer diameter of the drainage catheter 10 is set to the above value, the shortest distance between the geometric centers of any two side holes 201 on the drainage catheter 10 on the outer side wall of the drainage catheter 10 can be set to 2.5 mm, 3 mm, 4 mm, 4.5 mm or 5 mm, etc. It can be set as needed.

[0095] Such a configuration can ensure the structural strength of the drainage catheter 10 as much as possible, so that the minimum breaking stress of the drainage catheter 10 can reach 20N, which can prolong the service life of the drainage catheter 10 and avoid the drainage catheter 10 from breaking during use as much as possible.

[0096] In one embodiment, the distance from the geometric center of the side hole 201 closest to the proximal end 12 on the drainage catheter 10 to the distal end 11 is 10 mm-30 mm. With such a configuration, the drainage catheter 10 can better meet the use requirements of various different situations and has good adaptability.

[0097] Specifically, the distance from the geometric center of the side hole 201 closest to the proximal end 12 on the drainage catheter 10 to the distal end 11 can be 15 mm, 20 mm, 23 mm, 26 mm, etc., and can be set as needed.

[0098] Exemplarily, when the nominal outer diameter of the drainage catheter 10 is less than 2 mm, the distance from the geometric center of the side hole 201 closest to the proximal end 12 on the drainage catheter 10 to the distal end 11 can be set to 15 mm. When the nominal outer diameter of the drainage catheter 10 is greater than or equal to 2 mm and less than or equal to 4 mm, the distance from the geometric center of the side hole 201 closest to the proximal end 12 on the drainage catheter 10 to the distal end 11 can be set to 23 mm. When the nominal outer diameter of the drainage catheter 10 is greater than 4 mm, the distance from the geometric center of the side hole 201 closest to the proximal end 12 on the drainage catheter 10 to the distal end 11 can be set to 26 mm.

[0099] Generally, in minimally invasive surgeries such as cerebral hemorrhage and cerebrospinal effusion, the distal end 11 of the drainage catheter 10 needs to be placed in the patient's target tissue such as the hematoma cavity or effusion cavity, and the proximal end 12 of the drainage catheter 10 is connected to the suction pump, collection container 30 and other structures outside the patient's body to drain the liquid and / or gas in the patient's target tissue out of the patient's body. In this type of procedure, a variety of drainage catheters 10 of different specifications are usually required, and the opening size and size of the side holes 201 of catheters of different specifications are different. Doctors generally select a catheter with a suitable opening range to perform surgery on the patient based on the patient's age, the specific type of target tissue, and the location and size of the target tissue. However, the opening range of the existing drainage catheter 10 is usually not adjustable, resulting in the drainage catheter 10 often being only applicable to some specific situations and having poor adaptability.

[0100] In order to solve the above problem, in one of the embodiments of the present application, please refer to Fig.11 and Fig.12 The outer wall of the drainage catheter 10 also includes at least one hole mark 300, and the hole mark 300 is used to indicate the position and size of the hole.

[0101] It should be noted that the number of hole markers 300 can be two or more, and each hole marker 300 can identify the opening position and hole diameter size of a side hole 201 that can be selectively opened. It can be understood that for the finished drainage catheter 10, the side hole 201 with the hole marker 300 is not actually opened on the drainage catheter 10, but is in a closed state. When the doctor needs to use the drainage catheter 10, the doctor can open the side hole 201 of the required size and shape at the required position on the drainage catheter 10 according to the opening position and hole diameter size indicated by the hole marker 300.

[0102] For example, see Fig.11 and Fig.12 The drainage catheter 10 includes a first hole group 210, a second hole group 220, a third hole group 230 and a fourth hole group 240. The side holes 201 of the second hole group 220, the third hole group 230 and the fourth hole group 240 are all provided with hole marks 300, that is, for the finished product of the drainage catheter 10, the side holes 201 of the second hole group 220, the third hole group 230 and the fourth hole group 240 are all in a closed state. In this way, when using the drainage catheter 10, the doctor can open the side holes 201 of the second hole group 220 on the drainage catheter 10 according to the hole opening position and hole size indicated by the hole mark 300, or can open the side holes 201 of the second hole group 220 and the third hole group 230 on the drainage catheter 10 at the same time, or can open the side holes 201 of the second hole group 220, the third hole group 230 and the fourth hole group 240 on the drainage catheter 10 at the same time, so as to expand the application scope of the drainage catheter 10.

[0103] Specifically, a hole marker 300 can be set on the drainage catheter 10 within a pipe section less than or equal to 70 mm from the proximal end 12 of the drainage catheter 10, so that the drainage catheter 10 has a larger opening range, and the side hole 201 can be cut by a dedicated puncher.

[0104] Preferably, at least one of a hole area mark and a distance mark may be provided on the outer side wall of the drainage catheter 10, wherein the hole area mark is used to display the opening area of ​​the corresponding side hole 201, and the distance mark is used to display the distance from the geometric center of the corresponding side hole 201 to the proximal end 12. This makes the parameters of the selectively opened side hole 201 more comprehensive, and facilitates the doctor to open the side hole 201 of the required size and shape at the required position according to the mark.

[0105] In the drainage catheter 10 provided in the present embodiment, among the multiple hole groups 200, several hole groups 200 near the proximal end 12 are provided with hole identification 300, that is, the side holes 201 of one or more hole groups 200 near the proximal end 12 among the multiple hole groups 200 are in a closed state. With such a design, when using the drainage catheter 10, the doctor can open the side holes 201 of the required size and shape at the required position on the drainage catheter 10 according to the hole opening position and hole diameter size indicated by the hole identification 300, so that the drainage catheter 10 can be more adaptable and the safety hazards caused by the doctor's arbitrary hole opening can be avoided.

[0106] In one embodiment, see Fig.11 and Fig.12 , the hole identification 300 includes a color identification.

[0107] It can be understood that the color marking indicates the opening position and aperture size of the side hole 201 that can be selectively opened by color. For example, the color marking can be a colored coating provided on the outer wall of the drainage catheter 10. The color of the coating is different from the color of the outer wall of the drainage catheter 10, and the area covered by the coating is the opening position of the side hole 201. The size and shape of the coating are the same as the size and shape of the side hole 201 to be opened.

[0108] The drainage catheter 10 provided in this embodiment indicates the opening position and the size of the opening aperture by setting color markings. The structure is relatively simple, and the boundaries of the color markings are often very clear, which is beneficial for doctors to accurately open the side hole 201 of the required shape and size at the required position based on the color markings, thereby improving the effectiveness of the hole marking 300.

[0109] In one embodiment, see Fig.11 and Fig.12 The hole marker 300 includes a protrusion or a depression relative to the outer wall of the drainage catheter 10 .

[0110] It can be understood that in this embodiment, the opening position and the opening diameter of the side hole 201 that can be selectively opened are indicated mainly by setting a raised or recessed area relative to the outer wall of the drainage catheter 10 on the outer wall of the drainage catheter 10. The position of the raised or recessed area relative to the outer wall of the drainage catheter 10 corresponds to the opening position of the side hole 201 that can be selectively opened, and the shape and size of the raised or recessed area relative to the outer wall of the drainage catheter 10 are the same as the shape and size of the side hole 201 of the hole group 200 that can be selectively opened.

[0111] The drainage catheter 10 provided in this embodiment indicates the opening position and the size of the opening aperture of the side hole 201 by setting a raised or recessed area relative to the outer wall of the drainage catheter 10 on the outer wall of the drainage catheter 10. The structure is relatively simple, and the raised and recessed areas can be easily distinguished by touch, which is helpful for doctors to open the side hole 201 of the desired shape and size at the desired position by relying on touch.

[0112] To achieve the above purpose, the present application also provides a drainage system, please refer to Fig.14 The drainage system includes a collection container 30, a drainage tube 20, and the above-mentioned drainage catheter 10, wherein the proximal end 12 of the drainage catheter 10 is connected to one end of the drainage tube 20, and the collection container 30 is connected to the other end of the drainage tube 20. In other words, the drainage catheter 10, the drainage tube 20, and the collection container 30 are connected in sequence.

[0113] Specifically, the drainage system can also include a drug dispenser (not shown in the figure, the same below) and a three-way valve 40, the proximal end 12 of the drainage catheter 10 is connected to one interface of the three-way valve 40, the drug dispenser is connected to another interface of the three-way valve 40, one end of the drainage tube 20 is connected to the remaining interface of the three-way valve 40, and the collection container 30 is connected to the other end of the drainage tube 20.

[0114] In the drainage system provided in this embodiment, the drainage catheter 10 can be used to inject drugs into the patient's target tissues such as the ventricles and abdominal cavity, and the concentration of the drugs in the axial direction of the drainage catheter 10 is relatively uniform, which can improve the therapeutic effect of the drugs and avoid drug damage to the patient's target tissues as much as possible; in some cases, the drainage catheter 10 can also be used to extract gas and / or liquid from the patient's target tissue, and the suction force of the drainage catheter 10 in the axial direction is relatively uniform, which is conducive to improving the uniformity of suction.

[0115] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims

1. A drainage catheter (10), characterized in that: The drainage catheter (10) comprises a proximal end (12) and a distal end (11) which are arranged opposite to each other in the axial direction thereof, wherein the distal end (11) of the drainage catheter (10) is closed, and a plurality of hole groups (200) are provided on the side wall of a tube section of the drainage catheter (10) extending from the distal end (11) to the proximal end (12) at a preset distance, wherein the plurality of hole groups (200) are arranged at intervals along the axial direction of the drainage catheter (10), each of the hole groups (200) comprises at least two side holes (201), and at least two of the side holes (201) are arranged at intervals in the circumferential direction of the drainage catheter (10), and among the plurality of hole groups (200), the sum of the hole areas of all the side holes (201) of the hole group (200) closest to the distal end (11) is the largest, and the sum of the hole areas of all the side holes (201) of the hole group (200) closest to the proximal end (12) is the smallest.

2. The drainage catheter (10) according to claim 1, characterized in that: Among the plurality of hole groups (200), the sum of the hole areas of all the side holes (201) of the hole group (200) closest to the distal end (11) is 100% to 107% of the cross-sectional area of ​​the drainage channel (100) in the drainage catheter (10), and the sum of the hole areas of all the side holes (201) of the hole group (200) closest to the proximal end (12) is 60% to 79% of the cross-sectional area of ​​the drainage channel (100) in the drainage catheter (10).

3. The drainage catheter (10) according to claim 2, characterized in that: The plurality of hole groups (200) include a first hole group (210), a second hole group (220) and a third hole group (230) which are arranged in sequence from the distal end (11) to the proximal end (12); the sum of the hole areas of all the side holes (201) of the first hole group (210) is 100% to 107% of the drainage channel (100) in the drainage catheter (10); the sum of the hole areas of all the side holes (201) of the second hole group (220) is 77% to 93% of the drainage channel (100) in the drainage catheter (10); and the sum of the hole areas of all the side holes (201) of the third hole group (230) is 70% to 79% of the drainage channel (100) in the drainage catheter (10).

4. The drainage catheter (10) according to claim 3, characterized in that: The plurality of hole groups (200) further include a fourth hole group (240), wherein the fourth hole group (240) is located on a side of the third hole group (230) close to the proximal end (12), and an opening area of ​​all the side holes (201) of the fourth hole group (240) is 60% to 67% of the drainage channel (100) in the drainage catheter (10).

5. The drainage catheter (10) according to claim 1, characterized in that: At least two of the side holes (201) of the same hole group (200) are evenly spaced and arranged in the circumferential direction of the drainage catheter (10).

6. The drainage catheter (10) according to claim 5, characterized in that: Each hole group (200) comprises two side holes (201), and the two side holes (201) of the same hole group (200) are respectively located at two ends of the drainage catheter (10) in a radial direction.

7. The drainage catheter (10) according to claim 6, characterized in that: The radial directions defined by different hole groups (200) may be the same, or the radial directions defined by at least two hole groups (200) may be different.

8. The drainage catheter (10) according to claim 1, characterized in that: The nominal outer diameter of the drainage catheter (10) is less than 2 mm, and the shortest distance between the geometric centers of any two side holes (201) on the drainage catheter (10) on the outer wall of the drainage catheter (10) is greater than or equal to 1 mm; Alternatively, the nominal outer diameter of the drainage catheter (10) is greater than or equal to 2 mm and less than or equal to 4 mm, and the shortest distance between the geometric centers of any two of the side holes (201) on the drainage catheter (10) on the outer wall of the drainage catheter (10) is greater than or equal to 1.8 mm; Alternatively, the nominal outer diameter of the drainage catheter (10) is greater than 4 mm, and the shortest distance between the geometric centers of any two side holes (201) on the drainage catheter (10) on the outer wall of the drainage catheter (10) is greater than or equal to 2.5 mm.

9. The drainage catheter (10) according to claim 1, characterized in that: The distance from the geometric center of the side hole (201) on the drainage catheter (10) closest to the proximal end (12) to the distal end (11) is 10 mm-30 mm.

10. The drainage catheter (10) according to any one of claims 1 to 9, characterized in that: The outer wall of the drainage catheter (10) further includes at least one hole marker (300), and the hole marker (300) is used to indicate the position and size of the hole.

11. The drainage catheter (10) according to claim 10, characterized in that: The hole marker (300) includes a color marker; and / or the hole marker (300) includes a protrusion or a depression relative to the outer wall of the drainage catheter (10).

12. A drainage system, characterized in that: The drainage system comprises a collecting container (30), a drainage tube (20), and the drainage catheter (10) according to any one of claims 1 to 11, wherein the proximal end (12) of the drainage catheter (10) is connected to one end of the drainage tube (20), and the collecting container (30) is connected to the other end of the drainage tube (20).

Images