Medical catheter

Abstract

The medical catheter comprises an inner cannula and an outer cannula, the inner cannula comprises a non-reducing section, a first transition section and a reducing section which are sequentially connected, the outer diameter of the reducing section is smaller than that of the non-reducing section, and the first transition section is in transition connection with the reducing section and the non-reducing section; the outer sleeve comprises a non-flaring section, a second transition section and a flaring section which are connected in sequence, the inner diameter of the flaring section is increased relative to the inner diameter of the non-flaring section, the second transition section is in transition connection with the flaring section and the non-flaring section, the flaring section is sleeved outside the reducing section, and the outer diameter of the outer sleeve is equal to the outer diameter of the non-reducing section. Effective transition of a butt-joint area can be smoothly achieved, the butt-joint position of the inner cannula and the outer cannula is free of protrusions, smoothness of the butt-joint area in the pushing and using process is improved, conduction of movement and impedance force is reduced, the medical catheter can smoothly pass through a corner and a lesion position, and the medical catheter is prevented from being folded.

Description

Technical Field

[0001] The utility model relates to the technical field of medical equipment, in particular to a medical catheter. Background Art

[0002] During intravascular interventional surgery, the medical catheter needs to be pushed to the lesion site, and there are strict requirements on the outer diameter of the medical catheter. Medical catheters are usually spliced ​​together from multiple sections of medical catheters made of polymer materials. There are two ways to dock two sections of medical catheters, but the end-to-end docking has defects such as poor docking effect and easy breakage, and the connection reliability is not enough. Therefore, the stacking docking method is more commonly used. The so-called stacking docking is to directly connect two sections of sub-medical catheters of different diameters. However, the stacking docking has the defect of bulging at the docking point. When pushing, the bulge on the medical catheter is prone to excessive force at the bend and the lesion, resulting in failure to pass smoothly or causing the catheter to bend.

[0003] In view of the above-mentioned shortcomings, it is necessary to design a new medical catheter to overcome the above-mentioned defects. Utility Model Content

[0004] Therefore, the technical problem to be solved by the utility model is that when the existing medical catheter adopts a stacked docking method, there is a defect of bulging at the docking point, so as to provide a medical catheter.

[0005] In order to solve the above technical problems, the technical solution of the utility model is as follows:

[0006] A medical catheter, comprising:

[0007] The inner tube comprises a non-reduced diameter section, a first transition section and a reduced diameter section connected in sequence, wherein the outer diameter of the reduced diameter section is smaller than the outer diameter of the non-reduced diameter section, and the first transition section transitionally connects the reduced diameter section and the non-reduced diameter section;

[0008] The outer sleeve includes a non-expanding section, a second transition section and a expanding section which are connected in sequence. The inner diameter of the expanding section is larger than the inner diameter of the non-expanding section. The second transition section transitionally connects the expanding section and the non-expanding section. The expanding section is sleeved outside the reducing section. The outer diameter of the outer sleeve is equal to the outer diameter of the non-reducing section.

[0009] Furthermore, the outer diameters of various locations on the reduced diameter section are equal, the inner diameters of various locations on the expanded opening section are equal, and the outer diameter of the reduced diameter section is equivalent to the inner diameter of the expanded opening section.

[0010] Furthermore, the inner diameters of the reduced diameter section, the first transition section and the non-reduced diameter section are equal.

[0011] Furthermore, the inner diameter of the reduced diameter section is equal to the inner diameter of the non-expanded section.

[0012] Further, the line corresponding to the first transition section is an oblique line, and / or, in the longitudinal section of the outer sleeve, the line corresponding to the second transition section is an oblique line.

[0013] Furthermore, the length L1 of the first transition section along the length direction of the inner tube is greater than the length L2 of the second transition section along the length direction of the outer tube; the first angle α between the first transition section and the reduced diameter section is less than or equal to the second angle β between the second transition section and the expanded section.

[0014] Furthermore, the length of the first transition section is 0.7 mm to 1 mm, and the length of the second transition section is 0.3 mm to 0.5 mm.

[0015] Furthermore, the first angle α is 150 degrees to 165 degrees, and the second angle β is 160 degrees to 177 degrees.

[0016] Furthermore, before welding, an accommodation space is formed between the end surface of the expansion section and the outer wall of the first transition section, and / or the end of the reduced diameter section abuts against the second transition section.

[0017] Furthermore, the inner insert tube and the outer sleeve are welded together by hot melting or hot air welding, so that the inner insert tube and the outer sleeve are smoothly connected together.

[0018] The technical solution of this utility model has the following advantages:

[0019] 1. The medical catheter provided by the utility model comprises an inner tube and an outer tube, wherein the inner tube comprises a non-reduced diameter section, a first transition section and a reduced diameter section which are connected in sequence, wherein the outer diameter of the reduced diameter section is smaller than the outer diameter of the non-reduced diameter section, and the first transition section is transitionally connected to the reduced diameter section and the non-reduced diameter section; the outer tube comprises a non-expanded section, a second transition section and a expanded section which are connected in sequence, wherein the inner diameter of the expanded section is larger than the inner diameter of the non-expanded section, and the second transition section is transitionally connected to the expanded section and the non-expanded section, and the expanded section is sleeved outside the reduced diameter section, and the outer diameter of the outer tube is equal to the outer diameter of the non-reduced diameter section, so that an effective transition of the docking area can be smoothly achieved, and the docking point between the inner tube and the outer tube can be free of bulges, thereby improving the smoothness of the docking area during pushing and use, reducing the conduction of movement and impedance, facilitating the smooth passage of the medical catheter through corners and lesions, and avoiding the medical catheter from being folded.

[0020] 2. The medical catheter provided by the utility model has equal outer diameters at various locations on the reduced diameter section, equal inner diameters at various locations on the expanded mouth section, and the outer diameter of the reduced diameter section is equivalent to the inner diameter of the expanded mouth section, which is conducive to the fitting of the reduced diameter section and the expanded mouth section.

[0021] 3. The medical catheter provided by the utility model has the same inner diameters of the reduced diameter section, the first transition section and the non-reduced diameter section, and the inner diameter of the reduced diameter section is equal to the inner diameter of the non-expanded section, thereby improving the smoothness of the inner wall of the entire medical catheter.

[0022] 4. In the medical catheter provided by the utility model, the length L1 of the first transition section along the length direction of the inner tube is greater than the length L2 of the second transition section along the length direction of the outer tube; the first angle α between the first transition section and the reduced diameter section is less than or equal to the second angle β between the second transition section and the expanded section, which is conducive to the smooth connection of the inner tube and the outer tube after welding.

[0023] 5. The medical catheter provided by the utility model, before welding, forms a receiving space between the end face of the flared section and the outer wall of the first transition section, and the inner tube and the outer tube are welded together by hot melt or hot air welding. In this way, during the welding process, the melted and bulged material can fill the receiving space between the end face of the flared section and the outer wall of the first transition section, ensuring the smoothness of the outer wall of the medical catheter, and / or, the end of the reduced diameter section abuts against the second transition section, and the inner tube and the outer tube are welded together by hot melt or hot air welding, and the melted material will flow to and fill the receiving space between the end face of the reduced diameter section and the second transition section, ensuring the smoothness of the inner wall of the medical catheter, and finally the inner tube and the outer tube are smoothly connected together. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0025] Figure 1 It is a schematic diagram of the insertion of the medical catheter in the embodiment of the utility model when it is not inserted in place;

[0026] Figure 2 It is a cross-sectional schematic diagram of an inner cannula of a medical catheter in an embodiment of the utility model;

[0027] Figure 3 It is a cross-sectional schematic diagram of the outer sleeve of the medical catheter in the embodiment of the utility model.

[0028] Description of reference numerals:

[0029] 1. Inner insert; 11. Reduced diameter section; 12. First transition section; 13. Non-reduced diameter section; 2. Outer sleeve; 21. Expanded section; 22. Second transition section; 23. Non-expanded section. DETAILED DESCRIPTION

[0030] The technical solution of the utility model will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0031] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0032] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0033] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0034] Before introducing the medical catheter provided by the present invention, the design background of the medical catheter in the present invention is introduced again:

[0035] During intravascular interventional surgery, the medical catheter needs to be pushed to the lesion site. Medical catheters are usually made of two sections of catheters connected together in a stacked butt-jointed manner, and there is a defect of bulging at the butt joint area. When pushing, the bulge on the medical catheter is prone to excessive force at the bend and the lesion site, resulting in the inability to pass smoothly or causing the catheter to bend. Therefore, it is necessary to overcome the above defects.

[0036] like Figures 1 to 3As shown, this embodiment provides a medical catheter, including an inner tube 1 and an outer tube 2. The outer diameter of the inner tube 1 is equivalent to the inner diameter of the outer tube 2, and the two can form a relatively stable plug connection. In order to improve the connection reliability of the inner tube 1 and the outer tube 2, in this embodiment, the inner tube 1 and the outer tube 2 are welded together by hot melt welding or hot air welding. In this way, the connection reliability of the inner tube 1 and the outer tube 2 can be further improved on the basis of the plug connection between the inner tube 1 and the outer tube 2. In this embodiment, the material of the inner tube 1 is PEEK, PE material, and the material of the outer tube 2 is PEBAX, PA11, HTDP, TPU material. Of course, the inner tube 1 and the outer tube 2 can also be made of other materials, which are not specifically limited here, and the material can be selected according to actual needs.

[0037] The inner tube 1 comprises a non-reduced diameter section 13, a first transition section 12 and a reduced diameter section 11 which are connected in sequence.

[0038] The first transition section 12 transitionally connects the reduced diameter section 11 and the non-reduced diameter section 13. The outer diameter of the first transition section 12 gradually decreases from the non-reduced diameter section 13 to the reduced diameter section 11, so that the line corresponding to the first transition section 12 on the longitudinal section of the inner tube 1 is an oblique line.

[0039] The outer diameter of the reduced diameter section 11 is smaller than the outer diameter of the non-reduced diameter section 13, and the outer diameters of the reduced diameter section 11 are equal at all locations. At the same time, the inner diameters of the reduced diameter section 11, the first transition section 12, and the non-reduced diameter section 13 are equal, so that the inner wall of the inner tube 1 is smooth without steps. In addition, the outer diameters of the non-reduced diameter section 13 are equal at all locations.

[0040] The outer sleeve 2 comprises a non-expanded section 23, a second transition section 22 and a expanded section 21 which are connected in sequence.

[0041] The second transition section 22 transitionally connects the flared section 21 and the non-flared section 23. In the direction from the non-flared section 23 to the flared section 21, the inner diameter of the second transition section 22 gradually increases, so that on the longitudinal section of the outer sleeve 2, the line corresponding to the second transition section 22 is an oblique line.

[0042] The inner diameter of the expanded section 21 is larger than the inner diameter of the non-expanded section 23, and the inner diameters of the expanded section 21 are equal at all locations. Since the inner diameters of the expanded section 21 are equal at all locations, and the outer diameters of the reduced diameter section 11 are equal at all locations, and the outer diameter of the reduced diameter section 11 is equal to the inner diameter of the expanded section 21, it is convenient for the expanded section 21 to fit with the reduced diameter section 11. The outer diameters of the non-expanded section 23, the second transition section 22, and the expanded section 21 are equal, so that the outer wall of the outer sleeve 2 is smooth without steps, and the outer diameter of the outer sleeve 2 is equal to the outer diameter of the non-reduced diameter section 13.

[0043] It should be emphasized that: the length L1 of the first transition section 12 along the length direction of the inner tube 1 is greater than the length L2 of the second transition section 22 along the length direction of the outer tube 2, and the first angle α between the first transition section 12 and the reduced diameter section 11 is less than or equal to the second angle β between the second transition section 22 and the expanded section 21, which is conducive to the smooth connection between the inner tube 1 and the outer tube 2. Specifically, the length L1 of the first transition section 12 is 0.7mm to 1mm, the length L2 of the second transition section 22 is 0.3mm to 0.5mm, the first angle α is 150 degrees to 165 degrees, preferably, the first angle α is 160 degrees, the second angle β is 160 degrees to 177 degrees, preferably, the second angle β is 172 degrees.

[0044] The following describes the connection process of the medical catheter in this embodiment:

[0045] Align the reduced diameter section 11 of the inner tube 1 with the expanded opening section 21 and insert it;

[0046] Continue to insert the inner tube 1 into the outer tube 2, so that the reduced diameter section 11 of the inner tube 1 is sleeved in the expanded section 21 of the outer tube 2, and a receiving space is formed between the end surface of the expanded section 21 of the outer tube 2 and the outer wall of the first transition section 12, the inner tube 1 and the outer tube 2 are coaxially plugged, and the end of the reduced diameter section 11 abuts against the second transition section 22;

[0047] The inner tube 1 and the outer tube 2 are welded together in the form of hot melt welding or hot air welding. During the welding process, the melted raised material fills the end face of the flared section 21 and the outer wall of the first transition section 12 to form a receiving space, thereby ensuring a smooth connection between the outer walls of the inner tube 1 and the outer tube 2, and the molten material will flow to and fill the receiving space between the end face of the reduced diameter section 11 and the second transition section 22, thereby improving the smoothness of the inner wall of the medical catheter, and finally the inner tube 1 and the outer tube 2 are smoothly connected together.

[0048] The medical catheter in this embodiment includes an inner tube 1 and an outer tube 2. The inner tube 1 includes a non-reduced diameter section 13, a first transition section 12 and a reduced diameter section 11 connected in sequence. The outer diameter of the reduced diameter section 11 is smaller than the outer diameter of the non-reduced diameter section 13. The first transition section 12 transitionally connects the reduced diameter section 11 and the non-reduced diameter section 13. The outer tube 2 includes a non-expanding section 23, a second transition section 22 and a flared section 21 connected in sequence. The inner diameter of the flared section 21 is larger than the inner diameter of the non-expanding section 23. The second transition section 22 transitionally connects the flared section 21 and the non-expanding section 23. The flared section 21 is sleeved outside the reduced diameter section 11. The outer diameter of the outer tube 2 is equal to the outer diameter of the non-reduced diameter section 13. In this way, an effective transition of the docking area can be smoothly achieved, and there can be no bulge at the docking point between the inner tube 1 and the outer tube 2, thereby improving the smoothness of the area during pushing and use, reducing the conduction of movement and impedance, and facilitating the medical catheter to pass through corners and lesions smoothly, thereby avoiding the medical catheter from being folded.

[0049] Obviously, the above embodiments are merely examples for the purpose of clear explanation, and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived therefrom are still within the scope of protection of the invention of the utility model.

Claims

1. A medical catheter, characterized in that: include: An inner tube (1) comprises a non-reduced diameter section (13), a first transition section (12) and a reduced diameter section (11) connected in sequence, wherein the outer diameter of the reduced diameter section (11) is smaller than the outer diameter of the non-reduced diameter section (13), and the first transition section (12) transitionally connects the reduced diameter section (11) and the non-reduced diameter section (13); The outer sleeve (2) comprises a non-expanding section (23), a second transition section (22) and an expanding section (21) connected in sequence, wherein the inner diameter of the expanding section (21) is larger than the inner diameter of the non-expanding section (23), and the second transition section (22) transitionally connects the expanding section (21) and the non-expanding section (23), wherein: The expanded section (21) is sleeved on the outside of the reduced diameter section (11), and the outer diameter of the outer sleeve (2) is equal to the outer diameter of the non-reduced diameter section (13).

2. The medical catheter according to claim 1, characterized in that: The outer diameters of the reduced diameter section (11) are equal at all locations, the inner diameters of the expanded section (21) are equal at all locations, and the inner diameter of the expanded section (21) is equivalent to the outer diameter of the reduced diameter section (11).

3. The medical catheter according to claim 1 or 2, characterized in that: The inner diameters of the reduced diameter section (11), the first transition section (12) and the non-reduced diameter section (13) are equal.

4. The medical catheter according to claim 3, characterized in that: The inner diameter of the reduced diameter section (11) is equal to the inner diameter of the non-expanded section (23).

5. The medical catheter according to claim 1, characterized in that: On the longitudinal section of the inner tube (1), the line corresponding to the first transition section (12) is an oblique line, and / or, on the longitudinal section of the outer tube (2), the line corresponding to the second transition section (22) is an oblique line.

6. The medical catheter according to claim 1, characterized in that: A length L1 of the first transition section (12) along the length direction of the inner tube (1) is greater than a length L2 of the second transition section (22) along the length direction of the outer tube (2); a first angle α between the first transition section (12) and the reduced diameter section (11) is less than or equal to a second angle β between the second transition section (22) and the expanded section (21).

7. The medical catheter according to claim 6, characterized in that The length of the first transition section (12) is 0.7 mm to 1 mm, and the length of the second transition section (22) is 0.3 mm to 0.5 mm.

8. The medical catheter according to claim 6, characterized in that The first angle α is 150 degrees to 165 degrees, and the second angle β is 160 degrees to 177 degrees.

9. The medical catheter according to claim 1, characterized in that: Before welding, an accommodation space is formed between the end surface of the expansion section (21) and the outer wall of the first transition section (12), and / or the end of the reduced diameter section (11) abuts against the second transition section (22).

10. The medical catheter according to claim 9, characterized in that The inner insert tube (1) and the outer sleeve (2) are welded together by hot-melt welding or hot-air welding, so that the inner insert tube (1) and the outer sleeve (2) are smoothly connected together.

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