Central venous catheter with adjustable inner diameter

Abstract

The invention discloses a central venous catheter with the adjustable inner diameter. The central venous catheter comprises a catheter body, an adjusting assembly and a limiting assembly. The guide pipe body comprises a plurality of arc-shaped plates and a plurality of corrugated plates, the arc-shaped plates and the corrugated plates are sequentially arranged at intervals, and mounting grooves which communicate with one another are formed in the radial directions of the arc-shaped plates and the radial directions of the corrugated plates; the adjusting assemblies are arranged in the mounting grooves, the multiple adjusting assemblies are sequentially connected to form a circular ring structure, the first end of the first folding plate and the first end of the second folding plate are connected with the top and the bottom of the first end of the adjusting part correspondingly, and the second end of the adjusting part is connected with the first end of the arc-shaped block; the second end of the arc-shaped block is connected with the first folding plate and the second folding plate of the other adjusting assembly; the limiting assembly is arranged on the adjusting part. The inner diameter of the catheter body is adjusted, blood vessels of different inner diameters of a patient can be matched, practicability, convenience and protection to the patient are improved, and the thrombus forming probability and nursing difficulty are reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of medical devices, and more specifically, to a central venous catheter with an adjustable inner diameter. Background Art

[0002] A central venous catheter belongs to a type of intravascular catheter and is placed in a large vein. It can measure the central venous pressure to evaluate circulatory physiological parameters and estimate the amount of body fluid, etc. It can also be used for a large amount of rapid intravenous infusion, or long-term parenteral nutrition and antibiotic injection, and to establish a good infusion channel for patients with repeated infusions, avoiding the pain of repeated punctures, etc. The position of the tip of the central venous catheter is crucial for the treatment effect and patient safety. The tip of the central venous catheter should be located in the superior vena cava near the junction of the right atrium.

[0003] However, the inner diameter of the current central venous catheter cannot be adjusted. When the inner diameter of the central venous catheter does not match the blood vessel, a too thick catheter is likely to damage the vascular endothelium, while a too thin one will cause blood stasis, both significantly increasing the probability of thrombosis. Moreover, long-term use of a too thick catheter (such as exceeding 1 / 3 of the blood vessel diameter) may cause venous fibrosis or stenosis, which is particularly harmful to children and patients with poor vascular conditions, and also increases the nursing difficulty. In addition, as the condition of critically ill patients progresses, different treatment methods may be required at different stages of the disease, and the requirements for the inner diameter of the central venous catheter pipeline vary greatly.

[0004] Therefore, how to provide a central venous catheter with an adjustable inner diameter has become a technical problem urgently to be solved in this field. Summary of the Invention

[0005] An object of the present invention is to provide a new technical solution for a central venous catheter with an adjustable inner diameter.

[0006] According to a first aspect of the present invention, there is provided a central venous catheter with an adjustable inner diameter, comprising: a catheter body, an adjustment assembly, and a limit assembly;

[0007] The catheter body includes a plurality of arc-shaped plates and a plurality of corrugated plates, and the arc-shaped plates and the corrugated plates are arranged at intervals in sequence. Installation grooves communicating with each other are provided in both the radial direction of the arc-shaped plates and the radial direction of the corrugated plates;

[0008] The adjusting assembly is arranged in the installation groove, and a plurality of the adjusting assemblies are sequentially connected to form an annular structure; the adjusting assembly includes a first folding plate, a second folding plate, an arc-shaped block and an adjusting part. The first end of the first folding plate and the first end of the second folding plate are respectively connected to the top and bottom of the first end of the adjusting part. The second end of the adjusting part is connected to the first end of the arc-shaped block. The second end of the arc-shaped block is connected to the first folding plate and the second folding plate of another adjusting assembly. The adjusting part is used to drive the first end of the first folding plate and the first end of the second folding plate to move, so that the first folding plate and the second folding plate are unfolded or folded;

[0009] In the working state, the distance between the arc-shaped block and the first folding plate and the second folding plate of another adjusting assembly is adjusted through the adjusting part, so that a plurality of the corrugated plates are unfolded or folded, so as to change the inner diameter of the catheter body;

[0010] The limiting assembly is arranged on the adjusting part and is used to provide a limiting effect on the movement of the adjusting part.

[0011] Optionally, the adjustable-inner-diameter central venous catheter further includes an outer sleeve, the outer sleeve is sleeved outside the catheter body, the material of the outer sleeve is medical polyurethane and has elasticity, and the inner diameter of the outer sleeve is equal to the minimum inner diameter of the catheter body.

[0012] Optionally, the adjustable-inner-diameter central venous catheter further includes an annular membrane, the annular membrane is arranged inside the catheter body, and the structure of the annular membrane matches the structure of the catheter body.

[0013] Optionally, the material of the annular membrane is silica gel, and the thickness of the annular membrane is 50μm.

[0014] Optionally, the shapes of the corrugated plate, the first folding plate and the second folding plate are all wavy structures.

[0015] Optionally, there are a plurality of the installation grooves, and the plurality of installation grooves are arranged at intervals along the axial direction of the catheter body. The annular structures formed by the plurality of adjusting assemblies are respectively arranged in the plurality of installation grooves, and the length of the installation groove is equal to the maximum height of the adjusting assembly.

[0016] Optionally, a sliding groove is arranged on the inner wall of the arc-shaped block, and a sliding block is arranged on the inner wall of the installation groove. The sliding block is slidably arranged in the sliding groove.

[0017] Optionally, the adjusting part includes a moving plate, a connecting sleeve, a rack, a transmission gear, a connecting rod and a knob. A connecting hole is arranged inside the arc-shaped block. The first end of the moving plate is movably arranged in the connecting hole. The rack is arranged on the outer peripheral wall of the moving plate. The second end of the moving plate is inserted into the connecting sleeve, and the second ends of the first folding plate and the second folding plate are connected to the top and bottom of the moving plate.

[0018] The transmission gear meshes with the rack. The connecting rod is connected to the transmission gear. The connecting rod axially penetrates through the catheter body and is connected to the knob. The knob is located at the top of the catheter body.

[0019] Optionally, the limiting component includes a groove and a ball. The groove is arranged on the top of the moving plate and is evenly spaced along the length direction of the moving plate. The ball is arranged in the groove.

[0020] Optionally, the central venous catheter with adjustable inner diameter further includes a sensor, a controller and a display. The sensor is arranged in the installation groove. The controller is electrically connected to the sensor and the display respectively. The display is used to display the inner diameter of the catheter body.

[0021] The beneficial effects of the present invention are as follows:

[0022] In the present invention, the arc-shaped plates and the corrugated plates are arranged at intervals in sequence, and installation grooves communicating with each other are arranged in the radial direction of the arc-shaped plates and the radial direction of the corrugated plates. The adjusting components are arranged in the installation grooves. Multiple adjusting components are connected in sequence to form a ring structure. The first ends of the first folding plate and the second folding plate are respectively connected to the top and bottom of the first end of the adjusting part. The second end of the adjusting part is connected to the first end of the arc-shaped block. The second end of the arc-shaped block is connected to the first folding plate and the second folding plate of another adjusting component. The adjusting part is used to drive the first ends of the first folding plate and the second folding plate to move, so as to expand or fold the first folding plate and the second folding plate. The limiting component is arranged on the adjusting part. During use, medical staff, according to the actual situation, act on the adjusting part to drive the first folding plate and the second folding plate to move, so as to expand or fold the first folding plate and the second folding plate, and further increase or decrease the inner diameter of the ring structure and act on the catheter body to expand or fold multiple corrugated plates, thereby being able to change the inner diameter of the catheter body. The present invention adjusts the inner diameter of the catheter body, can match blood vessels with different inner diameters of patients, improves practicability, convenience and protection for patients, reduces the probability of thrombus formation and the nursing difficulty, and meets the use requirements.

[0023] Other features and advantages of the present invention will become apparent from the following detailed description of exemplary embodiments of the invention with reference to the accompanying drawings. Description of the Drawings

[0024] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and, together with the description, serve to explain the principles of the invention.

[0025] Figure 1 Structural diagram of the central venous catheter with adjustable inner diameter of the present invention;

[0026] Figure 2 Structural diagram of the catheter body of the present invention;

[0027] Figure 3 is Figure 2 Enlarged view at A in

[0028] Figure 4 Structural diagram of the adjustment assembly of the present invention;

[0029] Figure 5 Structural diagram of the adjustment assembly from another angle of the present invention;

[0030] Figure 6 is Figure 5 Enlarged view at B in

[0031] The labels in the figures are as follows: 1. Catheter body; 11. Arc plate; 12. Pleated plate; 2. Adjustment assembly; 21. First folding plate; 22. Second folding plate; 23. Arc block; 24. Moving plate; 25. Connecting sleeve; 26. Rack; 27. Driving gear; 28. Connecting rod; 29. Knob; 3. Limiting assembly; 31. Groove; 32. Ball; 4. Outer sleeve. Detailed Description of the Preferred Embodiments

[0032] Various exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. It should be noted that: unless otherwise specifically stated, the relative arrangements of components and steps, numerical expressions, and numerical values set forth in these embodiments do not limit the scope of the present invention.

[0033] The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the present invention, its application, or its use.

[0034] Techniques, methods, and devices known to those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered as part of the specification.

[0035] In all the examples shown and discussed here, any specific value should be construed as merely exemplary and not as a limitation. Thus, other examples of the exemplary embodiments may have different values.

[0036] As Figures 1 to 6 shown, an embodiment of the present invention provides a central venous catheter with an adjustable inner diameter, including: a catheter body 1, an adjustment assembly 2, and a limit assembly 3.

[0037] The catheter body 1 includes a plurality of arc-shaped plates 11 and a plurality of corrugated plates 12, and the arc-shaped plates 11 and the corrugated plates 12 are arranged at intervals in sequence. Installation grooves communicating with each other are provided in both the radial directions of the arc-shaped plates 11 and the corrugated plates 12.

[0038] Specifically, the number of the corrugated plates 12 is 6 - 10, and in the present invention, the number of both the corrugated plates 12 and the arc-shaped plates 11 is 7. The angle between the corrugated plates 12 and the arc-shaped plates 11 is 60 degrees, enhancing the radial deformation ability.

[0039] The adjustment assembly 2 is arranged in the installation groove, and a plurality of adjustment assemblies 2 are connected in sequence to form a ring structure; the adjustment assembly 2 includes a first folding plate 21, a second folding plate 22, an arc-shaped block 23, and an adjustment part. The first end of the first folding plate 21 and the first end of the second folding plate 22 are respectively connected to the top and bottom of the first end of the adjustment part, the second end of the adjustment part is connected to the first end of the arc-shaped block 23, and the second end of the arc-shaped block 23 is connected to the first folding plate 21 and the second folding plate 22 of another adjustment assembly 2. The adjustment part is used to drive the first end of the first folding plate 21 and the first end of the second folding plate 22 to move, so as to expand or fold the first folding plate 21 and the second folding plate 22.

[0040] In the working state, by adjusting the distance between the arc-shaped block 23 and the first folding plate 21 and the second folding plate 22 of another adjustment assembly 2 through the adjustment part, a plurality of corrugated plates 12 are expanded or folded, so as to change the inner diameter of the catheter body 1.

[0041] Specifically, when it is necessary to increase the inner diameter of the catheter body 1, medical staff first act on the adjustment part to drive the first end of the first folding plate 21 and the first end of the second folding plate 22 to move, so that the first folding plate 21 and the second folding plate 22 are expanded, that is, the inner diameter of the ring structure increases; the increase in the inner diameter of the ring structure will extrude the catheter body 1 outward, and then a plurality of corrugated plates 12 are expanded, so that the inner diameter of the catheter body 1 increases.

[0042] When it is necessary to reduce the inner diameter of the catheter body 1, medical staff first act on the adjustment part, so that the adjustment part drives the first ends of the first folding plate 21 and the second folding plate 22 to move, so that the first folding plate 21 and the second folding plate 22 are folded, that is, the inner diameter of the ring structure is reduced; the reduction of the inner diameter of the ring structure will squeeze the catheter body 1 inward, and then cause multiple corrugated plates 12 to be folded, so that the inner diameter of the catheter body 1 is increased.

[0043] The limiting component 3 is arranged on the adjustment part and is used to provide a limiting effect on the movement of the adjustment part.

[0044] In the present invention, the arc-shaped plates 11 and the corrugated plates 12 are arranged at intervals in sequence, and installation grooves communicating with each other are arranged in both the radial direction of the arc-shaped plates 11 and the radial direction of the corrugated plates 12. The adjustment components 2 are arranged in the installation grooves, and multiple adjustment components 2 are connected in sequence to form a ring structure. The first ends of the first folding plate 21 and the second folding plate 22 are respectively connected to the top and bottom of the first end of the adjustment part, the second end of the adjustment part is connected to the first end of the arc-shaped block 23, and the second end of the arc-shaped block 23 is connected to the first folding plate 21 and the second folding plate 22 of another adjustment component 2. The adjustment part is used to drive the first ends of the first folding plate 21 and the second folding plate 22 to move, so that the first folding plate 21 and the second folding plate 22 are unfolded or folded, and the limiting component 3 is arranged on the adjustment part. When in use, medical staff, according to the actual situation, act on the adjustment part to drive the first folding plate 21 and the second folding plate 22 to move, so that the first folding plate 21 and the second folding plate 22 are unfolded or folded, and then the inner diameter of the ring structure is increased or decreased, and act on the catheter body 1 to make multiple corrugated plates 12 unfold or fold, so that the inner diameter of the catheter body 1 can be changed. The present invention adjusts the inner diameter of the catheter body 1, can match blood vessels with different inner diameters of patients, improves practicability, convenience and protection for patients, and reduces the probability of thrombus formation and nursing difficulty.

[0045] Moreover, the present invention can also adjust the inner diameter of the catheter body 1 according to treatment requirements (such as rapid fluid replacement, high-concentration drug infusion), and then adjust the blood flow speed and flow rate in the catheter body 1, optimize the drug dilution effect, and reduce the risks of vascular irritation and phlebitis. It can also meet diverse clinical needs, such as large-flow rapid fluid replacement / blood transfusion during first aid, tumor chemotherapy (to avoid extravasation), hemodialysis, long-term parenteral nutrition support, etc.

[0046] In an embodiment of the adjustable inner diameter central venous catheter of the present invention, as Figure 1 shown, the adjustable inner diameter central venous catheter further includes an outer sleeve 4. The outer sleeve 4 is sleeved outside the catheter body 1. The material of the outer sleeve 4 is medical polyurethane and has elasticity. The inner diameter of the outer sleeve 4 is equal to the minimum inner diameter of the catheter body 1.

[0047] Specifically, the hardness of the outer sleeve 4 is 80A - 85A. By setting the inner diameter of the outer sleeve 4 to be equal to the minimum inner diameter of the catheter body 1 and making the outer sleeve 4 elastic, when the inner diameter of the catheter body 1 increases, due to the elastic property, the inner diameter of the outer sleeve 4 can increase with the increase of the inner diameter of the catheter body 1. When the inner diameter of the catheter body 1 decreases, the inner diameter of the outer sleeve 4 can contract with the decrease of the inner diameter of the catheter body 1, so that the outer sleeve 4 always adheres to the outer wall of the catheter body 1, providing a protective effect on the catheter body 1.

[0048] In an embodiment of the adjustable inner diameter central venous catheter of the present invention, the adjustable inner diameter central venous catheter further includes an annular membrane, and the annular membrane is arranged inside the catheter body 1, and the structure of the annular membrane matches the structure of the catheter body 1.

[0049] Specifically, the inner wall of the annular membrane is smooth, having good fluid conductivity for the liquid.

[0050] Furthermore, the material of the annular membrane is silicone, and the thickness of the annular membrane is 50μm. With such a setting, the annular membrane has good flexibility and better biocompatibility, reducing the risk of vascular intima damage and folding.

[0051] In an embodiment of the adjustable inner diameter central venous catheter of the present invention, as Figures 1 to 6 shown, the shapes of the corrugated plate 12, the first folding plate 21 and the second folding plate 22 are all wavy structures.

[0052] It should be noted that the corrugated plate 12, the first folding plate 21 and the second folding plate 22 can also be rectangular, trapezoidal or other structures, which are not limited herein.

[0053] In an embodiment of the adjustable inner diameter central venous catheter of the present invention, there are multiple installation grooves, and the multiple installation grooves are arranged at intervals along the axial direction of the catheter body 1. The annular structures formed by the multiple adjustment components 2 are respectively arranged in the multiple installation grooves, and the length of the installation groove is equal to the maximum height of the adjustment component 2.

[0054] Specifically, the width of the installation groove is greater than the width of the arc-shaped block 23.

[0055] In the present invention, by arranging the multiple installation grooves at intervals along the axial direction of the catheter body 1 and making the annular structures formed by the multiple adjustment components 2 be respectively arranged in the multiple installation grooves, the multiple annular structures can adjust the inner diameter of the catheter body 1, and the stability of the adjustable inner diameter central venous catheter of the present invention during the adjustment process can be ensured.

[0056] In an embodiment of the central venous catheter with adjustable inner diameter of the present invention, a sliding groove is provided on the inner wall of the arc-shaped block 23, and a sliding block is provided on the inner wall of the installation groove. The sliding block is slidably arranged in the sliding groove.

[0057] Specifically, the arc-shaped block 23 is located at the central position of the installation groove, so that the sliding block is slidably arranged in the sliding groove, and thus the arc-shaped block 23 and the adjusting part can be stably placed on the catheter body 1.

[0058] In an embodiment of the central venous catheter with adjustable inner diameter of the present invention, as Figures 3 to 6 shown, the adjusting part includes a moving plate 24, a connecting sleeve 25, a rack 26, a transmission gear 27, a connecting rod 28 and a knob 29. A connecting hole is provided inside the arc-shaped block 23. The first end of the moving plate 24 is movably arranged in the connecting hole. The rack 26 is arranged on the outer peripheral wall of the moving plate 24. The second end of the moving plate 24 is inserted into the connecting sleeve 25, and the second ends of the first folding plate 21 and the second folding plate 22 are connected to the top and bottom of the moving plate 24.

[0059] The transmission gear 27 meshes with the rack 26. The connecting rod 28 is connected to the transmission gear 27. The connecting rod 28 axially penetrates through the catheter body 1 and is connected to the knob 29. The knob 29 is located at the top of the catheter body 1.

[0060] Specifically, notches are respectively provided at the top and bottom of the end of the connecting sleeve 25, so that the second end of the moving plate 24 drives the second ends of the first folding plate 21 and the second folding plate 22 to move in the notches, and the second ends of the first folding plate 21 and the second folding plate 22 will not be stuck with the connecting sleeve 25.

[0061] In the axial direction, the connecting rod 28 is connected to the transmission gears 27 of a plurality of adjusting assemblies 2, so that when the connecting rod 28 rotates, it can drive the transmission gears 27 of a plurality of adjusting assemblies 2 to rotate simultaneously, thereby adjusting the inner diameter of the entire catheter body 1 at the same time.

[0062] A rotating hole is provided on the catheter body 1. The rotating hole is arranged along the axial direction of the catheter body 1 and is communicated with the installation groove. The connecting rod 28 is rotatably arranged in the rotating hole.

[0063] When it is necessary to increase the inner diameter of the catheter body 1, medical staff first act on the knob 29 to rotate the knob 29, which drives the connecting rod 28 to rotate. The rotation of the connecting rod 28 drives the transmission gear 27 to rotate. The rotation of the transmission gear 27 causes the rack 26 engaged with it to move, thereby driving the moving plate 24 to move. The movement of the moving plate 24 drives the second ends of the first folding plate 21 and the second folding plate 22 to move, so that the first folding plate 21 and the second folding plate 22 are unfolded, that is, the inner diameter of the ring structure increases. The increase in the inner diameter of the ring structure presses the catheter body 1 outward, and then the plurality of corrugated plates 12 are unfolded, so that the inner diameter of the catheter body 1 increases.

[0064] When it is necessary to decrease the inner diameter of the catheter body 1, medical staff first act on the adjusting part to rotate the knob 29, which drives the connecting rod 28 to rotate. The rotation of the connecting rod 28 drives the transmission gear 27 to rotate. The rotation of the transmission gear 27 causes the rack 26 engaged with it to move, thereby driving the moving plate 24 to move. The movement of the moving plate 24 drives the second ends of the first folding plate 21 and the second folding plate 22 to move, so that the first folding plate 21 and the second folding plate 22 are folded, that is, the inner diameter of the ring structure decreases. The decrease in the inner diameter of the ring structure presses the catheter body 1 inward, and then the plurality of corrugated plates 12 are folded, so that the inner diameter of the catheter body 1 increases.

[0065] In an embodiment of the adjustable inner diameter central venous catheter of the present invention, as Figure 6 shown, the limiting component 3 includes a groove 31 and a ball 32. The groove 31 is arranged on the top of the moving plate 24 and is evenly spaced along the length direction of the moving plate 24. The ball 32 is arranged in the groove 31.

[0066] In the present invention, by arranging the groove 31 on the top of the moving plate 24, the groove 31 is evenly spaced along the length direction of the moving plate 24, and the ball 32 is arranged in the groove 31. When the moving plate 24 moves until the ball 32 abuts against the arc-shaped block 23 or the connecting sleeve 25, a greater force needs to be applied to move the ball 32 into the arc-shaped block 23 or the connecting sleeve 25, and then the moving plate 24 can continue to move, so that the first folding plate 21 and the second folding plate 22 are unfolded or folded, avoiding the rapid increase or decrease of the inner diameter of the ring structure, and providing a protective effect for the patient's blood vessels.

[0067] In an embodiment of the adjustable inner diameter central venous catheter of the present invention, the adjustable inner diameter central venous catheter further includes a sensor, a controller and a display. The sensor is arranged in the installation groove, and the controller is electrically connected to the sensor and the display respectively. The display is used to display the inner diameter of the catheter body 1.

[0068] Specifically, the display can be provided on the top or side wall of the catheter body 1, or can be externally connected to the catheter body 1 through electrical connection.

[0069] In the present invention, by arranging the sensor in the installation groove, the controller is electrically connected to the sensor and the display respectively, and the inner diameter of the catheter body 1 is directly displayed through the display, thereby facilitating the observation of medical staff and providing convenience in use.

[0070] Although some specific embodiments of the present invention have been described in detail by way of examples, those skilled in the art should understand that the above examples are only for illustration purposes and not for limiting the scope of the present invention. Those skilled in the art should understand that the above embodiments can be modified without departing from the scope and spirit of the present invention. The scope of the present invention is defined by the appended claims.

Claims

1. An adjustable inner diameter central venous catheter, characterized in that, Comprising: A catheter body, an adjustment assembly, and a limiting assembly; The catheter body includes a plurality of arc-shaped plates and a plurality of corrugated plates, and the arc-shaped plates and the corrugated plates are arranged at intervals in sequence. Installation grooves communicating with each other are provided in both the radial direction of the arc-shaped plates and the radial direction of the corrugated plates; The adjustment assembly is arranged in the installation groove, and a plurality of the adjustment assemblies are connected in sequence to form an annular structure; the adjustment assembly includes a first folding plate, a second folding plate, an arc-shaped block, and an adjustment part. The first end of the first folding plate and the first end of the second folding plate are respectively connected to the top and bottom of the first end of the adjustment part. The second end of the adjustment part is connected to the first end of the arc-shaped block, and the second end of the arc-shaped block is connected to the first folding plate and the second folding plate of another adjustment assembly. The adjustment part is used to drive the first end of the first folding plate and the first end of the second folding plate to move, so as to unfold or fold the first folding plate and the second folding plate; The limiting assembly is arranged on the adjustment part and is used to provide a limiting effect on the movement of the adjustment part.

2. The adjustable inner diameter central venous catheter according to claim 1, wherein The central venous catheter with adjustable inner diameter further includes an outer sleeve, the outer sleeve is sleeved outside the catheter body, the material of the outer sleeve is medical polyurethane and has elasticity, and the inner diameter of the outer sleeve is equal to the minimum inner diameter of the catheter body.

3. The adjustable inner diameter central venous catheter according to claim 1, wherein The central venous catheter with adjustable inner diameter further includes an annular membrane, the annular membrane is arranged inside the catheter body, and the structure of the annular membrane matches the structure of the catheter body.

4. The adjustable inner diameter central venous catheter according to claim 3, characterized in that, The material of the annular membrane is silicone, and the thickness of the annular membrane is 50μm.

5. The adjustable inner diameter central venous catheter according to claim 1, wherein The shapes of the corrugated plate, the first folding plate, and the second folding plate are all wavy structures.

6. The adjustable inner diameter central venous catheter according to claim 1, wherein There are a plurality of the installation grooves, and the plurality of installation grooves are arranged at intervals along the axial direction of the catheter body. The annular structures formed by the plurality of adjustment assemblies are respectively arranged in the plurality of installation grooves, and the length of the installation groove is equal to the maximum height of the adjustment assembly.

7. The adjustable inner diameter central venous catheter according to claim 1, characterized in that, A sliding groove is provided on the inner wall of the arc-shaped block, and a sliding block is provided on the inner wall of the installation groove. The sliding block is slidably arranged in the sliding groove.

8. The adjustable inner diameter central venous catheter according to claim 1, characterized in that, The adjustment part includes a moving plate, a connecting sleeve, a rack, a transmission gear, a connecting rod, and a knob. A connecting hole is provided inside the arc-shaped block, the first end of the moving plate is movably arranged in the connecting hole, the rack is arranged on the outer peripheral wall of the moving plate, the second end of the moving plate is inserted into the connecting sleeve, and the second ends of the first folding plate and the second folding plate are connected to the top and bottom of the moving plate; The transmission gear meshes with the rack, the connecting rod is connected to the transmission gear, the connecting rod penetrates through the catheter body in the axial direction and is connected to the knob, and the knob is located at the top of the catheter body.

9. The adjustable inner diameter central venous catheter according to claim 8, characterized in that, The limiting assembly includes a groove and a ball. The groove is provided on the top of the moving plate and is evenly spaced along the length direction of the moving plate. The ball is arranged in the groove.

10. The adjustable-inner-diameter central venous catheter according to claim 1, characterized in that, The central venous catheter with adjustable inner diameter further includes a sensor, a controller, and a display. The sensor is disposed in the mounting groove. The controller is electrically connected to the sensor and the display respectively. The display is used to display the inner diameter of the catheter body.

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