A peripheral inserted central catheter

Abstract

The utility model discloses a kind of peripheral implantation central venous catheter, comprising: connecting component, with external infusion instrument connection;Catheter body, with the connecting component is connected, and along the length direction of the catheter body, the outer diameter of the catheter body is gradually reduced from the tail portion of the catheter body to the head portion of the catheter body, the inner diameter of the catheter body remains constant;Fixed sleeve, fixedly sleeved on the catheter body, and the fixed sleeve is porous fiber structure.The peripheral implantation central venous catheter provided by the utility model has high structural strength, good fatigue resistance, stable injection flow rate, and is not prone to turbulent flow and flow rate mutation.

Description

Technical Field

[0001] This utility model relates to the field of medical device technology, and in particular to a peripherally inserted central venous catheter. Background Technology

[0002] With the continuous development of intravenous infusion technology, venous catheter technology has been widely used in clinical practice due to its advantages such as simple operation, safety, high puncture success rate, minimal trauma to patients, few complications, no impact on normal patient activities, ability to remain in the body for a relatively long time, and easy patient acceptance. Among them, the peripherally inserted central venous catheter (PICC) is a commonly used venous catheter in clinical practice, which includes a portion of the catheter body that remains in the body. To adapt to the human peripheral venous insertion pathway and reduce catheter advancement resistance, the catheter body is generally designed with a structure in which the outer diameter gradually narrows from the tail to the head, and then maintains a constant outer diameter after narrowing for a certain distance.

[0003] However, most existing catheters employ a design where the inner and outer diameters decrease simultaneously: the outer and inner diameters decrease gradually in stages, and after a certain range of diameter changes, both the inner and outer diameters remain constant until the catheter tip. During infusion, changes in the inner diameter can easily induce turbulence and sudden changes in flow velocity, while the narrowing of the inner diameter causes a gradual increase in internal pressure. With this structure, the catheter wall thickness remains essentially constant, and the resulting pressure fluctuations lead to insufficient fatigue resistance under high-pressure infusion, repeated bending, and long-term placement conditions, making the catheter prone to fatigue failure and drug leakage. Utility Model Content

[0004] To address the shortcomings of existing technologies, this invention provides a peripherally inserted central venous catheter with high structural strength, good fatigue resistance, stable injection flow rate, and low turbulence and sudden flow rate changes.

[0005] This utility model is achieved through the following technical solution:

[0006] A peripherally inserted central venous catheter, comprising:

[0007] Connecting components for connection to external infusion devices;

[0008] The catheter body is connected to the connecting assembly, and along the length direction of the catheter body, the outer diameter of the catheter body gradually decreases from the tail end to the head end, while the inner diameter of the catheter body remains constant.

[0009] A fixing sleeve is fixedly sleeved on the catheter body, and the fixing sleeve is a porous fiber structure.

[0010] Furthermore, the catheter body includes a first tube segment and a second tube segment, the connecting assembly, the first tube segment and the second tube segment are connected in sequence, and the first wall thickness of the first tube segment gradually decreases along the length direction of the catheter body.

[0011] Furthermore, along the length of the catheter body, the second wall thickness of the second segment remains constant.

[0012] Furthermore, the minimum value of the first wall thickness of the first pipe segment is equal to the second wall thickness of the second pipe segment.

[0013] Furthermore, the first pipe segment and the second pipe segment are integrally formed.

[0014] Furthermore, the fixing sleeve is made of medical-grade polyester material.

[0015] Furthermore, the fixing sleeve is fitted and fixed onto the first pipe section.

[0016] Furthermore, the third wall thickness of the fixed sleeve is 1-2 mm.

[0017] Furthermore, the fixing sleeve is heat-fused to the first pipe section.

[0018] Furthermore, the connecting assembly includes a Luer connector, a connecting tube, and a butterfly connector. The Luer connector is connected to the external infusion device, the butterfly connector is connected to the first tubing segment, and one end of the connecting tube is connected to the Luer connector and the other end is connected to the butterfly connector.

[0019] Compared with existing technologies, the advantages of this utility model are:

[0020] 1. By setting the catheter body to have a constant inner diameter and an outer diameter that gradually decreases along the length, the first wall thickness of the first segment is increased, which can effectively improve the overall structural strength of the catheter body, significantly improve its resistance to bending, tension and compression, and withstand higher infusion / injection pressures to meet the needs of high-pressure angiography; at the same time, it can reduce drug turbulence and drug residue, reduce the risk of tubing blockage and venous thrombosis, and improve the stability of the infusion process.

[0021] 2. In addition, this embodiment also includes a fixing sleeve, which is made of medical polyester and has a loose porous fiber structure. It works in conjunction with the butterfly connector to reliably fix the catheter throughout the entire insertion process, effectively reducing the possibility of catheter displacement or dislodgement, reducing the risk of subcutaneous infection, and improving the safety of catheter insertion and patient comfort. Attached Figure Description

[0022] Figure 1This is a schematic diagram of the structure of a peripherally inserted central venous catheter according to an embodiment of the present invention;

[0023] Figure 2 This is a cross-sectional view of a peripherally inserted central venous catheter according to an embodiment of the present invention;

[0024] Figure 3 This is a partial cross-sectional view of a peripherally inserted central venous catheter according to an embodiment of the present invention;

[0025] Figure 4 This is a cross-sectional view of the connection between the first segment and the second segment of a peripherally inserted central venous catheter according to an embodiment of the present invention.

[0026] Figure 5 This is a schematic diagram illustrating the use of a peripherally inserted central venous catheter according to an embodiment of the present invention.

[0027] Explanation of reference numerals in the attached drawings: 100, connecting assembly; 200, conduit body; 300, fixing sleeve; 200a, tail; 200b, head; 201, first tube segment; 202, second tube segment; 101, Luer connector; 102, connecting tube; 103, butterfly connector; L, length; H3, third wall thickness; D1, inner diameter; D2, outer diameter; H2, second wall thickness; H1, first wall thickness. Detailed Implementation

[0028] The following detailed, non-limiting description of the utility model's technical solution, in conjunction with preferred embodiments and accompanying drawings, is provided. In the description of this utility model, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this utility model, and should not be construed as limiting this utility model.

[0029] like Figures 1 to 5As shown, one embodiment of this utility model provides a peripherally inserted central venous catheter (PICC). The PICC includes a connecting assembly 100 and a catheter body 200 that are interconnected. The connecting assembly 100 is used to connect to external infusion devices, enabling the connection of input pathways for media such as medications and nutritional solutions. The catheter body 200 is used to insert into a human vein to perform clinical operations such as intravenous infusion, drug administration, and angiography. Notably, this embodiment innovatively adopts a constant inner diameter design for the catheter body 200. Compared to existing catheter structures where the inner diameter changes synchronously with the outer diameter, the PICC provided in this embodiment has higher strength and can withstand higher infusion and injection pressures. It is fully adaptable to high-pressure clinical operation scenarios such as high-pressure angiography, broadening the product's applicability. Simultaneously, it reduces turbulence and flow velocity fluctuations during injection, lowering the risks of catheter blockage, thrombosis, and drug residue.

[0030] Specifically, refer to Figure 2 and Figure 4 As shown, along the length of the catheter body 200, the outer diameter D2 of the catheter body 200 gradually decreases from the tail 200a to the head 200b. Simultaneously, the inner diameter D1 of the catheter body 200 remains constant. This structural design, with a gradually decreasing outer diameter D2 and a constant inner diameter D1, ensures that the catheter body 200 adapts to peripheral venous insertion pathways, reduces frictional resistance during insertion, significantly improves the smoothness of the puncture and insertion process, and reduces the risk of endothelial damage. It also reduces issues such as turbulent drug flow and sudden changes in flow rate, effectively reducing the probability of drug residue, tubing blockage, and venous thrombosis, thus improving infusion stability.

[0031] Furthermore, continue to refer to Figure 2 and Figure 4As shown, in this embodiment, the catheter body 200 is integrally extruded and includes a first tube segment 201 and a second tube segment 202. One end of the first tube segment 201 is connected to the connecting component 100, and the other end is connected to the second tube segment 202. Along the length of the catheter body 200, the second wall thickness H2 of the second tube segment 202 remains constant, while the first wall thickness H1 of the first tube segment 201 smoothly decreases from the end of the connecting component 100 to the end of the second tube segment 202 until the minimum value of the first wall thickness H1 is equal to the second wall thickness H2 of the second tube segment 202, achieving a smooth transition between the two tube segments. This gradually changing wall thickness and smooth transition design can balance the connection strength at the tail 200a of the catheter body 200 and the insertion performance at the head 200b of the catheter body 200. Compared to existing technologies, the wall thickness at the tail 200a connection position of the catheter body 200 in this embodiment is significantly increased, thereby effectively improving its resistance to pressure, bending, and tension. Meanwhile, the thick-walled design of the first tubing section 201 can withstand higher infusion / injection pressures, meeting the safety requirements for high-pressure angiography.

[0032] Further integration Figures 1 to 3 The peripherally inserted central venous catheter provided in this embodiment also includes a fixing sleeve 300, which is fixedly sleeved on the catheter body 200. When in use, it is implanted under the skin of the human body, which can fix the catheter body 200, inhibit the probability of problems such as displacement or dislodgement of the catheter body 200, reduce the probability of subcutaneous infection, and effectively reduce the patient's foreign body discomfort after catheterization, thereby improving the safety of catheterization and patient comfort.

[0033] Specifically, the fixing sleeve 300 is made of medical-grade polyester material and has a loose, porous fiber structure at the microscopic level. (See reference...) Figure 5 After the fixation sleeve 300 is embedded in the subcutaneous tissue, the subcutaneous tissue can penetrate into the porous fiber gaps of the fixation sleeve 300 within 1-2 weeks, achieving a tight fit and fixation between the fixation sleeve 300 and the soft tissue, reducing catheter movement and displacement. At the same time, a stable tissue adhesion interface is formed on the surface of the fixation sleeve 300, effectively blocking the invasion of external bacteria, reducing bacterial colonization and migration and growth into deeper tissues, significantly reducing the probability of subcutaneous inflammation and infection, and further ensuring the stability and safety of long-term catheter placement.

[0034] As a preferred embodiment, the length L of the fixing sleeve 300 is 8-12mm. In this embodiment, the length L of the fixing sleeve 300 is 10mm. This size parameter can ensure the fixing effect of the fixing sleeve 300 while avoiding problems such as strong foreign body sensation caused by an excessively large fixing sleeve 300, thus balancing fixing performance and patient comfort.

[0035] Preferably, the third wall thickness H3 of the fixing sleeve 300 is 1-2 mm. In this embodiment, the third wall thickness H3 is 1.5 mm. This thickness parameter can ensure the structural strength of the fixing sleeve 300 itself, avoid deformation and damage of the fixing sleeve 300 under pressure, and at the same time, it will not excessively increase the overall outer diameter of the fixing sleeve 300, thereby reducing the difficulty of catheter insertion and the risk of subcutaneous tissue trauma.

[0036] Optionally, after the fixation sleeve 300 is inserted into the human body, it is located under the skin, embedded in the subcutaneous tissue and 2-3 cm away from the skin outlet, so as to avoid displacement of the fixation sleeve 300 caused by daily limb activities and skin traction, which would lead to displacement of the catheter body 200.

[0037] Optionally, the fixing sleeve 300 and the first pipe section 201 are connected by a heat fusion fixing process. This fixing method can achieve a seamless fit and firm connection between the sleeve and the conduit body 200, without gaps or loosening, avoiding slippage or detachment of the fixing sleeve 300 during use. At the same time, the process is simple, the connection is stable, and the overall structural reliability of the product is guaranteed.

[0038] In addition, combined Figure 1 and Figure 2 The connecting assembly 100 includes a Luer connector 101, a connecting tube 102, and a butterfly connector 103 connected in sequence. The Luer connector 101 is used to connect to external infusion devices to achieve leak-free drug delivery. The butterfly connector 103 is fused and fixedly connected to the first segment 201 of the catheter body 200. This modular assembly design has a neat layout and is easy to assemble and disassemble. In addition, after catheter insertion, the butterfly connector 103 can be fixed to the skin with medical tape to achieve initial fixation of the catheter body 200 and prevent displacement of the catheter body 200 when the fixing sleeve 300 is not in use.

[0039] The peripherally inserted central venous catheter provided in this embodiment features a catheter body 200 with a constant inner diameter D1 and an outer diameter D2 that gradually decreases along its length. This increases the first wall thickness H1 of the first segment 201, effectively improving the overall structural strength of the catheter body 200. This significantly improves its resistance to bending, tension, and compression, allowing it to withstand higher infusion / injection pressures and meeting the requirements for high-pressure angiography. Simultaneously, it reduces drug turbulence and residue, decreasing the risk of tubing blockage and venous thrombosis, and improving the stability of the infusion process. Furthermore, this embodiment includes a fixing sleeve 300 made of medical-grade polyester with a loose, porous fiber structure. This sleeve works in conjunction with the butterfly connector 103 to reliably fix the catheter throughout the insertion process, effectively reducing the possibility of catheter displacement or dislodgement, minimizing the risk of subcutaneous infection, and improving catheter placement safety and patient comfort.

[0040] The above embodiments only illustrate several implementation methods of this utility model, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of this utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. A peripherally inserted central venous catheter, characterized in that, include: Connection component (100) for connection to external infusion devices; The catheter body (200) is connected to the connecting assembly (100), and along the length direction of the catheter body (200), the outer diameter (D2) of the catheter body (200) gradually decreases from the tail (200a) to the head (200b) of the catheter body (200), while the inner diameter (D1) of the catheter body (200) remains constant. A fixing sleeve (300) is fixedly sleeved on the catheter body (200), and the fixing sleeve (300) is a porous fiber structure.

2. The peripherally inserted central venous catheter according to claim 1, characterized in that, The catheter body (200) includes a first tube segment (201) and a second tube segment (202). The connecting assembly (100), the first tube segment (201) and the second tube segment (202) are connected in sequence, and the first wall thickness (H1) of the first tube segment (201) gradually decreases along the length direction of the catheter body (200).

3. The peripherally inserted central venous catheter according to claim 2, characterized in that, Along the length of the catheter body (200), the second wall thickness (H2) of the second tube segment (202) remains constant.

4. The peripherally inserted central venous catheter according to claim 3, characterized in that, The minimum value of the first wall thickness (H1) of the first pipe section (201) is equal to the second wall thickness (H2) of the second pipe section (202).

5. The peripherally inserted central venous catheter according to claim 2, characterized in that, The first pipe section (201) and the second pipe section (202) are integrally formed.

6. The peripherally inserted central venous catheter according to claim 1, characterized in that, The fixing sleeve (300) is made of medical-grade polyester material.

7. The peripherally inserted central venous catheter according to claim 2, characterized in that, The fixing sleeve (300) is fitted and fixed on the first pipe section (201).

8. The peripherally inserted central venous catheter according to claim 1, characterized in that, The third wall thickness (H3) of the fixed sleeve (300) is 1-2 mm.

9. The peripherally inserted central venous catheter according to claim 7, characterized in that, The fixing sleeve (300) is heat-fused to the first pipe section (201).

10. The peripherally inserted central venous catheter according to claim 2, characterized in that, The connection assembly (100) includes a Luer connector (101), a connecting tube (102), and a butterfly connector (103). The Luer connector (101) is connected to the external infusion device, the butterfly connector (103) is connected to the first tube segment (201), and one end of the connecting tube (102) is connected to the Luer connector (101) and the other end is connected to the butterfly connector (103).

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