Central venous catheter

Abstract

The invention discloses a central venous catheter which comprises a central catheter and an auxiliary part, and the central catheter is hollow; the auxiliary part is connected with the far end of the central catheter, the auxiliary part is of an annular structure and is provided with a notch, and the far end of the central catheter extends into the auxiliary part from the notch. The auxiliary part of the annular structure can make contact with the blood vessel wall preferentially, the pressure of the blood vessel wall on the far end of the center catheter is dispersed, meanwhile, the port of the far end of the center catheter can be away from the blood vessel wall, and therefore the risk that the center catheter is blocked by the blood vessel wall is reduced, and meanwhile the auxiliary part can provide supporting and stability for the center catheter; and the stability of the central catheter during movement in the blood vessel wall is improved.

Description

Technical Field

[0001] The invention relates to the technical field of pipes, in particular to a central venous catheter. Background Art

[0002] In the prior art, during long-term and repeated use, the distal end of the central venous catheter directly contacts the blood vessel wall, making the central venous catheter prone to the risk of blockage, thereby requiring the catheter to be replaced or re-inserted. Summary of the invention

[0003] The main technical problem solved by the present application is to provide a central venous catheter to solve the problem that the catheter is prone to blockage.

[0004] In order to solve the above technical problems, the present application adopts a technical solution: providing a central venous catheter, including a central catheter and an auxiliary component, wherein the central catheter is hollow; the auxiliary component is connected to the distal end of the central catheter, the auxiliary component is annular in structure and is provided with a notch, and the distal end of the central catheter extends into the auxiliary component from the notch.

[0005] In some embodiments, the auxiliary component is in a circular ring structure or an elliptical ring structure.

[0006] In some embodiments, the distal end of the central catheter is directed toward the center of the annular structure.

[0007] In some embodiments, the length of the central conduit extending into the auxiliary component is less than or equal to the distance between the center of the auxiliary component and the notch.

[0008] In some embodiments, the auxiliary part is made of metal, and a silicon coating is formed on an outer surface of the auxiliary part.

[0009] In some embodiments, the material of the central catheter includes silicone.

[0010] In some embodiments, the distal end surface of the central catheter is planar.

[0011] In some embodiments, the auxiliary part is in a circular ring structure, and the diameter of the auxiliary part ranges from 4.6 to 5.6 mm.

[0012] In some embodiments, the outer diameter of the central catheter ranges from 2.2-4.2 mm.

[0013] In some embodiments, the central catheter and the auxiliary component are integrally formed.

[0014] Beneficial effects: The auxiliary parts of the present application are provided with an annular structure so that they can contact the blood vessel wall preferentially, disperse the pressure of the blood vessel wall on the distal end of the central catheter, and at the same time allow the port at the distal end of the central catheter to be away from the blood vessel wall, thereby reducing the risk of the central catheter being blocked by the blood vessel wall. At the same time, the auxiliary parts can also provide support and stability for the central catheter, improving the stability of the central catheter when moving in the blood vessel wall. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments. 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 creative work. Among them:

[0016] Figure 1 A structural diagram of a central venous catheter provided in one embodiment of the present application;

[0017] Figure 2 A structural diagram of a central venous catheter provided in another embodiment of the present application;

[0018] Figure 3 A structural diagram of a central venous catheter provided in another embodiment of the present application;

[0019] Figure 4 This is a statistical graph of the standard deviation of a central venous catheter provided in one embodiment of the present application. DETAILED DESCRIPTION

[0020] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0021] The terms "first", "second", "third" in this application are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features. Thus, the features defined as "first", "second", "third" can expressly or implicitly include at least one of the features. In the description of this application, the meaning of "multiple" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined. In the embodiments of this application, all directional indications (such as up, down, left, right, front, back...) are only used to explain the relative position relationship, movement, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication also changes accordingly. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device comprising a series of steps or units is not limited to the steps or units listed, but optionally also includes steps or units that are not listed, or optionally also includes other steps or units inherent to these processes, methods, products or devices.

[0022] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0023] See also Figure 1 In one embodiment of the present application, a central venous catheter 100 is provided, comprising a central catheter 10 and an auxiliary component 20, wherein the central catheter 10 is hollow. The auxiliary component 20 is connected to the distal end 11 of the central catheter 10, and the auxiliary component 20 is annular and provided with a notch 21, and the distal end 11 of the central catheter 10 extends into the auxiliary component 20 from the notch 21.

[0024] Specifically, the central catheter 10 is used as the main infusion channel and adopts a hollow design to ensure that liquids or drugs can pass smoothly. The annular auxiliary member 20 provides support for the central catheter 10. The presence of the notch 21 on the auxiliary member 20 allows the distal end 11 of the central catheter 10 to be inserted into the auxiliary member 20, which not only improves the flexibility of the central catheter 10 in curved blood vessels, but also enables the central catheter 10 to stay stably at a specific position, facilitating precise medical operations.

[0025] In actual use, the central venous catheter 100 is inserted into the blood vessel, and the auxiliary component 20 enters the blood vessel first. The annular auxiliary component 20 forms two contact points in the blood vessel wall, so that the central catheter 10 remains stable in the vena cava and the port is placed away from the blood vessel wall. The auxiliary component 20 enhances the passability of the central catheter 10 in curved blood vessels, allowing the central catheter 10 to move along the blood vessel path more easily, reducing the damage of the central venous catheter 100 to the blood vessel wall. At the same time, the part of the auxiliary component 20 that extends into the blood vessel can be used as an anchor point to help the central catheter 10 stay stably at a specific position in the blood vessel, making it easier for the operator to perform precise medical operations.

[0026] In the above-mentioned central venous catheter 100, the auxiliary component 20 with a ring structure can preferentially contact the blood vessel wall, disperse the pressure of the blood vessel wall on the distal end 11 of the central catheter 10, and at the same time, the port of the distal end 11 of the central catheter 10 can be away from the blood vessel wall, avoiding the central catheter 10 from being completely covered, thereby reducing the risk of the central catheter 10 being blocked by the blood vessel wall. At the same time, the auxiliary component 20 can also provide support and stability for the central catheter 10, thereby improving the stability of the central catheter 10 when moving in the blood vessel wall.

[0027] In one embodiment, the auxiliary component 20 may be coated with a radiopaque material marker to facilitate the operator to clearly identify the position of the central catheter 10 under X-ray fluoroscopy, thereby providing an intuitive visual guide for the central catheter 10 .

[0028] In one embodiment, the material of the auxiliary component 20 includes metal, and a silicon coating is formed on the outer surface of the auxiliary component 20. The silicon coating can reduce the pressure and friction of the auxiliary component 20 on the surrounding tissues and improve the comfort during use.

[0029] Specifically, since metal has high strength, corrosion resistance and good mechanical properties, metal is selected as the material of the auxiliary component 20 because it not only has sufficient rigidity to provide support but also has good biocompatibility and can meet the requirements for the central venous catheter 100 to be implanted in the body.

[0030] The silicon coating on the outer surface of the auxiliary component 20 can be achieved by chemical vapor deposition (CVD), physical vapor deposition (PVD) or dip coating. The silicon coating not only provides an additional protective layer for the auxiliary component 20, but also gives the auxiliary component 20 biological and physical properties suitable for implantation in the body.

[0031] In one embodiment, the material of the central catheter 10 includes silicone. It is understandable that silicone has good flexibility and elasticity, and can adapt to the natural curvature and movement of blood vessels, thereby reducing the pressure on the blood vessel wall and reducing the risk of damage to the blood vessel by the central venous catheter 100.

[0032] Please continue reading Figure 1In one embodiment, the central catheter 10 and the auxiliary component 20 are integrally formed. The integrally formed central catheter 10 and the auxiliary component 20 can improve the structural strength of the entire central venous catheter 100.

[0033] In one embodiment, ultrasonic or laser welding methods may be used to fuse the contact surfaces of the central catheter 10 and the auxiliary component 20 into an integrated structure at a specific temperature.

[0034] In other embodiments, the central catheter 10 and the auxiliary component 20 may be separate structures, which is not limited here.

[0035] In one embodiment, the auxiliary component 20 and the central catheter 10 may be connected mechanically. For example, a threaded interface may be used between the distal end 11 of the central catheter 10 and the auxiliary component 20 so that the two are connected by rotating and tightening.

[0036] In one embodiment, the auxiliary component 20 and the central catheter 10 may also be connected by an adhesive, for example, a medical-grade adhesive with good biocompatibility is used to adhere the auxiliary component 20 and the central catheter 10 to ensure a firm connection between the central catheter 10 and the auxiliary component 20 .

[0037] Please also read Figure 1 and Figure 2 In one embodiment, the auxiliary member 20 is in a circular ring structure or an elliptical ring structure. Through the above configuration, the auxiliary member 20 with a circular structure can provide uniform pressure distribution for the central catheter 10, and the auxiliary member 20 with an elliptical structure can be adjusted according to the specific morphology of the blood vessel to better adapt to the blood vessel shape of different patients, thereby improving the fit and stability of the central venous catheter 100.

[0038] In one embodiment, when the auxiliary member 20 is in a circular ring structure, the diameter of the auxiliary member 20 ranges from 4.6 to 5.6 mm. Specifically, the diameter of the auxiliary member 20 can be 4.6 mm, 5 mm, or 5.6 mm.

[0039] Please refer again Figure 1 In one embodiment, the distal end 11 of the central catheter 10 points to the center of the annular structure. Pointing the distal end 11 of the central catheter 10 to the center of the auxiliary component 20 can ensure that the distal end 11 of the central catheter 10 can be accurately positioned at an ideal position in the blood vessel, so that the pressure on the distal end 11 of the central catheter 10 is more balanced, reducing the risk of the central venous catheter 100 locally compressing the blood vessel wall and protecting the endothelial cells of the blood vessel.

[0040] Specifically, when the distal end 11 of the central catheter 10 remains concentric with the annular structure, it can naturally find a most stable position after entering the blood vessel, thereby reducing the possibility of the central venous catheter 100 being deflected or rotated, so that the distal end 11 of the central catheter 10 is always in the best working state.

[0041] Please also read Figure 1 and Figure 3 In one embodiment, the length of the central catheter 10 extending into the auxiliary member 20 is less than or equal to the distance between the center of the auxiliary member 20 and the notch 21. By limiting the length of the central catheter 10 extending into the auxiliary member 20, the risk of the distal end 11 of the central catheter 10 exceeding the boundary of the auxiliary member 20 can be reduced, so that the distal end 11 of the central catheter 10 can be stably located inside the annular auxiliary member 20, reducing the risk of the central catheter 10 affecting the overall shape and function of the auxiliary member 20, thereby providing a more reliable fixation effect for the central catheter 10.

[0042] Please refer again Figure 1 In one embodiment, the distal end 11 of the central catheter 10 is a flat surface. It is understood that, compared with a sharp or irregular end surface, a flat distal end 11 can reduce the risk of accidental scratches or perforations on the blood vessel wall, thereby improving the safety of the central venous catheter 100 during use.

[0043] In one embodiment, the outer diameter of the central catheter 10 is in the range of 2.2-4.2 mm. Specifically, the outer diameter of the central catheter 10 is 2.2 mm, 3.2 mm or 4.2 mm.

[0044] In one embodiment, to verify the performance of the central venous catheter 100 of the present application, a clinical trial is conducted to evaluate the hydraulic characteristics and flow rate sustainability of the central venous catheter 100 and compare the results with those of a standard dialysis catheter.

[0045] Specifically, see Figure 4 , the present application selected 120 common standard dialysis catheters as a control group and tested the new central venous catheter 100. All central catheters 10 were measured under the same conditions to ensure the comparability of the results.

[0046] The blood pump was set to generate a negative pressure of -200 mmHg on the arterial line under test conditions, simulating the working environment during actual dialysis. The entire trial lasted for 7 weeks, during which various data were regularly monitored and recorded to evaluate changes in catheter performance over time.

[0047] By analyzing the data, it can be seen that the initial flow rate of the new central venous catheter 100 when inserted is 390 ml / min, which is slightly lower than the standard catheter (the average Qb_200 flow rate is 348 ml / min). This indicates that the new central venous catheter 100 may need a certain amount of time to adapt to the body environment or reach the best working state in the early stage.

[0048] The average Qb_200 flow rate of the new central venous catheter 100 reached 401 ml / min after 7 weeks, which is significantly higher than the 348 ml / min of the standard catheter. This shows that the average flow rate of the self-central venous catheter 10 during the 7-week use period is 53 ml / min higher than that of the standard catheter, which means that the new central venous catheter 100 can not only maintain a stable flow rate, but also improve its performance over time. At the same time, the flow rate of the new central venous catheter 100 increased within 7 weeks, while the flow rate of the standard catheter remained relatively stable.

[0049] In addition, the standard deviation of the new central venous catheter 100 is 80 ml / min, which is slightly larger than the 64 ml / min of the standard catheter, and is better than the standard catheter overall. The difference in flow rate between the new central venous catheter 100 and the standard catheter can be confirmed to be statistically significant by t-test or other appropriate statistical methods. Specifically, after 7 weeks of use, the average flow rate of the new central venous catheter 100 is significantly higher than that of the standard catheter, with a p value of less than 0.05, where the p value is the threshold for statistical significance.

[0050] In summary, the results show that the new central venous catheter 100 can still provide a stable blood flow of up to 401 ml / min after 7 weeks of use, which is significantly higher than the standard dialysis catheter. The new central venous catheter 100 shows higher flow and better stability in long-term use. Higher blood flow means more efficient treatment effects, reducing the time required for each dialysis and improving the quality of life of patients.

[0051] The results show that by providing the annular auxiliary member 20 at the distal end 11 of the central catheter 10, two contact points on the annular auxiliary member 20 are supported on the blood vessel wall, thereby reducing the formation of sheath and fibrosis and providing more stable blood flow.

[0052] The above are only implementation methods of the present application, and are not intended to limit the patent scope of the present application. Any equivalent structure or equivalent process transformation made using the contents of the present application specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present application.

Claims

1. A central venous catheter, characterized in that: The central venous catheter comprises: The central catheter is hollow; The auxiliary piece is connected to the distal end of the central catheter. The auxiliary piece is annular in structure and is provided with a notch. The distal end of the central catheter extends into the auxiliary piece from the notch.

2. The central venous catheter according to claim 1, characterized in that: The auxiliary component is in a circular ring structure or an elliptical ring structure.

3. The central venous catheter according to claim 1, characterized in that: The distal end of the central catheter points to the center of the annular structure.

4. The central venous catheter according to claim 3, characterized in that: The length of the central conduit extending into the auxiliary component is less than or equal to the distance between the center of the auxiliary component and the notch.

5. The central venous catheter according to claim 1, characterized in that: The auxiliary member is made of metal, and a silicon coating is formed on an outer surface of the auxiliary member.

6. The central venous catheter according to claim 1, characterized in that: The material of the central catheter includes silicone.

7. The central venous catheter according to claim 1, characterized in that: The distal end surface of the central catheter is a plane.

8. The central venous catheter according to claim 1, characterized in that: The auxiliary part is in a circular ring structure, and the diameter of the auxiliary part ranges from 4.6 to 5.6 mm.

9. The central venous catheter according to claim 1, characterized in that: The outer diameter of the central catheter ranges from 2.2 to 4.2 mm.

10. The central venous catheter according to claim 1, characterized in that: The central conduit and the auxiliary component are integrally formed.

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