An adjustable internal diameter central venous catheter

Abstract

The application discloses a central venous catheter with adjustable inner diameter, which comprises a catheter body, an adjusting assembly and a limiting assembly; the catheter body comprises a plurality of arc-shaped plates and a plurality of corrugated plates, and the arc-shaped plates and the corrugated plates are sequentially and spacedly arranged, and the radial direction of the arc-shaped plates and the radial direction of the corrugated plates are both provided with mutually-communicating mounting grooves; the adjusting assembly is arranged in the mounting grooves, a plurality of the 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 respectively connected to the top and the 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, and the second end of the arc-shaped block is connected to the first folding plate and the second folding plate of another adjusting assembly; and the limiting assembly is arranged on the adjusting part. The application adjusts the inner diameter of the catheter body, can match blood vessels with different inner diameters of patients, improves practicability, convenience and protection of the patients, and reduces the probability of thrombosis and nursing difficulty.

Description

Technical Field

[0001] This invention relates to the field of medical device technology, and more specifically, to a central venous catheter with an adjustable inner diameter. Background Technology

[0002] A central venous catheter (CVC) is a type of intravascular catheter placed in a large vein. It measures central venous pressure to assess circulatory physiological parameters and estimate fluid levels. It can also be used for large-volume, rapid intravenous infusions, long-term parenteral nutrition, antibiotic administration, and to establish a reliable infusion route for patients requiring repeated infusions, avoiding the pain of repeated punctures. The position of the CVC tip is crucial for treatment efficacy and patient safety; the tip should be located within the superior vena cava, near the junction with the right atrium.

[0003] However, the current central venous catheter (CVC) diameter is not adjustable. When the CVC diameter does not match the blood vessel, an overly thick catheter can easily damage the vascular endothelium, while an overly thin catheter can lead to blood stasis, both significantly increasing the probability of thrombosis. Furthermore, long-term use of overly thick catheters (such as those exceeding 1 / 3 of the blood vessel diameter) may cause venous fibrosis or stenosis, which is especially harmful to children and patients with poor vascular conditions, and also increases the difficulty of nursing care. In addition, critically ill patients may require different treatment methods at different stages of the disease as the condition progresses, resulting in significant changes in the required CVC diameter.

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

[0005] One 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, an adjustable-diameter central venous catheter is provided, comprising: a catheter body, an adjustment assembly, and a limiting assembly;

[0007] The catheter body includes multiple arc-shaped plates and multiple pleated plates, and the arc-shaped plates and the pleated plates are arranged alternately in sequence. The radial directions of the arc-shaped plates and the radial directions of the pleated plates are provided with interconnected mounting grooves.

[0008] The adjustment assembly is disposed in the mounting groove, and multiple adjustment assemblies are connected in sequence to form a ring 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. 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 that the first folding plate and the second folding plate unfold or fold.

[0009] In the working state, the distance between the arc-shaped block and the first folding plate and the second folding plate of the other adjustment component is adjusted by the adjustment part, so that the multiple folding plates are unfolded or folded to change the inner diameter of the catheter body;

[0010] The limiting component is disposed on the adjusting part and is used to limit the movement of the adjusting part.

[0011] Optionally, the adjustable inner diameter central venous catheter further includes an outer sleeve, which is sleeved on the outside of the catheter body. The outer sleeve is made of medical polyurethane and is elastic. The inner diameter of the outer sleeve is equal to the minimum inner diameter of the catheter body.

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

[0013] Optionally, the annular membrane is made of silicone and has a thickness of 50 μm.

[0014] Optionally, the pleated plate, the first folded plate, and the second folded plate are all wavy structures.

[0015] Optionally, the mounting groove has multiple slots, which are spaced apart along the axial direction of the conduit body. The annular structure formed by the multiple adjustment components is respectively disposed in the multiple mounting grooves, and the length of the mounting groove is equal to the maximum height of the adjustment component.

[0016] Optionally, a groove is provided on the inner wall of the arc-shaped block, and a slider is provided on the inner wall of the mounting groove, the slider being slidably disposed within the groove.

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

[0018] The transmission gear meshes with the rack, the connecting rod is connected to the transmission gear, the connecting rod passes through the conduit body in the axial direction and is connected to the knob, and the knob is located at the top of the conduit body.

[0019] Optionally, the limiting component includes a groove and a ball bearing. The groove is disposed on the top of the movable plate and is evenly spaced along the length direction of the movable plate. The ball bearing is disposed within the groove.

[0020] Optionally, the adjustable-diameter central venous catheter further includes a sensor, a controller, and a display. The sensor is disposed in the mounting slot, and the controller is electrically connected to both the sensor and the display. The display is used to display the inner diameter of the catheter body.

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

[0022] This invention arranges arc-shaped plates and pleated plates alternately in sequence, and provides interconnected mounting grooves in the radial directions of both the arc-shaped plates and the pleated plates. Adjustment components are placed in the mounting grooves, and multiple adjustment components are connected in sequence to form a ring structure. The first end of the first folded plate and the first end of the second folded 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 folded plate and the second folded plate of another adjustment component. The adjustment part is used to drive the first end of the first folded plate and the first end of the second folded plate to move, so that the first folded plate and the second folded plate can be unfolded or folded. A limiting component is provided on the adjustment part. In use, medical staff can adjust the adjustment mechanism according to the actual situation, causing the first and second folding plates to move, thus unfolding or folding them. This increases or decreases the inner diameter of the annular structure. The adjustment also affects the catheter body, causing multiple folded plates to unfold or fold, thereby changing the inner diameter of the catheter body. This invention adjusts the inner diameter of the catheter body to match blood vessels of different diameters, improving practicality, convenience, and patient protection, reducing the probability of thrombosis and the difficulty of care, and meeting usage requirements.

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

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

[0025] Figure 1 This is a structural diagram of the adjustable inner diameter central venous catheter of the present invention;

[0026] Figure 2 This is a structural diagram of the catheter body of the present invention;

[0027] Figure 3 for Figure 2 Enlarged view of point A in the middle;

[0028] Figure 4 This is a structural diagram of the adjustment component of the present invention;

[0029] Figure 5 This is a structural diagram of the adjustment component of the present invention at another angle;

[0030] Figure 6 for Figure 5 Enlarged view of point B in the middle.

[0031] The following are marked in the diagram: 1. Conduit body; 11. Arc plate; 12. Pleated plate; 2. Adjustment assembly; 21. First fold plate; 22. Second fold plate; 23. Arc block; 24. Moving plate; 25. Connecting sleeve; 26. Rack; 27. Transmission gear; 28. Connecting rod; 29. ​​Knob; 3. Limiting assembly; 31. Groove; 32. Ball bearing; 4. Outer sleeve. Detailed Implementation

[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 arrangement, numerical expressions, and values ​​of the components and steps set forth in these embodiments do not limit the scope of the invention.

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

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

[0035] In all the examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values.

[0036] like Figures 1 to 6 As shown, an embodiment of the present invention provides an adjustable central venous catheter, comprising: a catheter body 1, an adjustment component, and a limiting component 3.

[0037] The conduit body 1 includes multiple arc-shaped plates 11 and multiple pleated plates 12, and the arc-shaped plates 11 and pleated plates 12 are arranged alternately. The radial directions of the arc-shaped plates 11 and the radial directions of the pleated plates 12 are provided with interconnected mounting grooves.

[0038] Specifically, the number of pleated plates 12 is 6-10, and in this invention, the number of pleated plates 12 and arc-shaped plates 11 is 7 each. The angle between the pleated plates 12 and the arc-shaped plates 11 is 60 degrees to enhance radial deformation capability.

[0039] An adjustment component is installed in the mounting slot, and multiple adjustment components are connected in sequence to form a ring structure. The adjustment component 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. 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. 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 that the first folding plate 21 and the second folding plate 22 can be unfolded or folded.

[0040] In operation, the distance between the arc block 23 and the first folding plate 21 and the second folding plate 22 of another adjustment component is adjusted by the adjustment part, so that the multiple folding plates 12 can be unfolded or folded 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, causing the adjustment part to move the first end of the first folding plate 21 and the first end of the second folding plate 22, so that the first folding plate 21 and the second folding plate 22 are unfolded, that is, the inner diameter of the ring structure is increased; the increase in the inner diameter of the ring structure will squeeze the catheter body 1 outward, thereby causing multiple pleated plates 12 to be unfolded, thereby increasing the inner diameter of the catheter body 1.

[0042] When it is necessary to reduce the inner diameter of the catheter body 1, the medical staff first act on the adjustment part, so that the adjustment part drives 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 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, thereby causing multiple pleated plates 12 to be folded, thereby increasing the inner diameter of the catheter body 1.

[0043] The limiting component 3 is provided on the adjusting part to limit the movement of the adjusting part.

[0044] This invention arranges arc-shaped plates 11 and pleated plates 12 alternately in sequence, and provides interconnected mounting grooves in the radial directions of both arc-shaped plates 11 and pleated plates 12. Adjustment components are placed in the mounting grooves, and multiple adjustment components are connected in sequence to form a ring structure. The first end of the first folded plate 21 and the first end of the second folded 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. The second end of the arc-shaped block 23 is connected to the first folded plate 21 and the second folded plate 22 of another adjustment component. The adjustment part is used to drive the first end of the first folded plate 21 and the first end of the second folded plate 22 to move, so that the first folded plate 21 and the second folded plate 22 unfold or fold. The limiting component 3 is provided on the adjustment part. In use, medical staff can adjust the adjustment mechanism according to the actual situation, causing 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 can be unfolded or folded, thereby increasing or decreasing the inner diameter of the annular structure. This also acts on the catheter body 1, causing the multiple pleated plates 12 to unfold or fold, thereby changing the inner diameter of the catheter body 1. This invention adjusts the inner diameter of the catheter body 1 to match blood vessels of different inner diameters in patients, improving practicality, convenience and protection for patients, and reducing the probability of thrombosis and the difficulty of nursing care.

[0045] Furthermore, this invention can adjust the inner diameter of the catheter body 1 according to treatment needs (such as rapid fluid resuscitation or high-concentration drug infusion), thereby adjusting the blood flow velocity and flow rate within the catheter body 1, optimizing drug dilution effects, and reducing vascular irritation and the risk of phlebitis. It can also meet diverse clinical needs, such as high-flow-rate rapid fluid resuscitation / blood transfusion during emergency treatment, tumor chemotherapy (avoiding extravasation), hemodialysis, and long-term parenteral nutrition support.

[0046] In one embodiment of the adjustable inner diameter central venous catheter of the present invention, such as Figure 1 As shown, the adjustable inner diameter central venous catheter also includes an outer sleeve 4, which is sleeved on the outside of the catheter body 1. The outer sleeve 4 is made of medical polyurethane and is elastic. The inner diameter of the outer sleeve 4 is equal to the minimum inner diameter of the catheter body 1.

[0047] Specifically, the outer sleeve 4 has a hardness of 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 elasticity, 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 shrink with the decrease of the inner diameter of the catheter body 1. Thus, the outer sleeve 4 is always attached to the outer wall of the catheter body 1, providing protection for the catheter body 1.

[0048] In one 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 disposed 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, giving it good conductivity for liquids.

[0050] Furthermore, the annular membrane is made of silicone and has a thickness of 50μm. This design improves the membrane's flexibility and biocompatibility, reducing the risk of damage to the vascular endothelium and kinking.

[0051] In one embodiment of the adjustable inner diameter central venous catheter of the present invention, such as Figures 1 to 6 As shown, the pleated plate 12, the first folded plate 21, and the second folded plate 22 are all wavy structures.

[0052] It should be noted that the pleated plate 12, the first folded plate 21 and the second folded plate 22 can also be rectangular, trapezoidal or other structures, and there are no restrictions here.

[0053] In one embodiment of the adjustable inner diameter central venous catheter of the present invention, there are multiple mounting slots, which are spaced apart along the axial direction of the catheter body 1. A ring structure formed by multiple adjustment components is respectively disposed in the multiple mounting slots, and the length of the mounting slot is equal to the maximum height of the adjustment component.

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

[0055] By arranging multiple mounting slots at intervals along the axial direction of the catheter body 1 and setting multiple adjusting components into annular structures within the mounting slots, the present invention enables multiple annular structures to adjust the inner diameter of the catheter body 1, thereby ensuring the stability of the adjustable inner diameter central venous catheter of the present invention during the adjustment process.

[0056] In one embodiment of the adjustable inner diameter central venous catheter of the present invention, a groove is provided on the inner wall of the arc-shaped block 23, and a slider is provided on the inner wall of the mounting groove, the slider being slidably disposed in the groove.

[0057] Specifically, the arc-shaped block 23 is located at the center of the mounting groove, allowing the slider to slide within the groove, thereby enabling the arc-shaped block 23 and the adjustment part to be stably placed on the conduit body 1.

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

[0059] The transmission gear 27 meshes with the rack 26, and the connecting rod 28 is connected to the transmission gear 27. The connecting rod 28 passes through the conduit body 1 in the axial direction and is connected to the knob 29. The knob 29 is located at the top of the conduit body 1.

[0060] Specifically, notches are 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 end of the first folding plate 21 and the second end of the second folding plate 22 to move within the notches, so that the second end of the first folding plate 21 and the second end of the second folding plate 22 will not get stuck with the connecting sleeve 25.

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

[0062] The catheter body 1 is provided with a rotating hole, which is set along the axial direction of the catheter body 1 and is connected to the mounting groove. The connecting rod 28 is rotatably set in the rotating hole.

[0063] When it is necessary to increase the inner diameter of the catheter body 1, the medical staff first applies the knob 29, causing the knob 29 to rotate and drive the connecting rod 28 to rotate. The rotation of the connecting rod 28 drives the transmission gear 27 to rotate, and the rotation of the transmission gear 27 moves the rack 26 that meshes with it, which in turn drives the moving plate 24 to move. The movement of the moving plate 24 drives the second end of the first folding plate 21 and the second end of 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 will squeeze the catheter body 1 outward, thereby causing multiple pleated plates 12 to unfold, thus increasing the inner diameter of the catheter body 1.

[0064] When it is necessary to reduce the inner diameter of the catheter body 1, the medical staff first acts on the adjustment part, causing the knob 29 to rotate, which drives the connecting rod 28 to rotate. The rotation of the connecting rod 28 drives the transmission gear 27 to rotate, and the rotation of the transmission gear 27 moves the rack 26 that meshes with it, which in turn drives the moving plate 24 to move. The movement of the moving plate 24 drives the second end of the first folding plate 21 and the second end of 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, which will cause multiple pleated plates 12 to be folded, thereby increasing the inner diameter of the catheter body 1.

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

[0066] This invention provides a solution by placing grooves 31 on the top of a movable plate 24, with the grooves 31 evenly spaced along the length of the movable plate 24, and placing ball bearings 32 within the grooves 31. When the movable plate 24 moves to the point where the ball bearings 32 abut against the arc-shaped block 23 or the connecting sleeve 25, a greater force is required to move the ball bearings 32 into the arc-shaped block 23 or the connecting sleeve 25, thereby allowing the movable plate 24 to continue moving. This causes the first folding plate 21 and the second folding plate 22 to be unfolded or folded, preventing the inner diameter of the annular structure from rapidly increasing or decreasing, thus providing protection for the patient's blood vessels.

[0067] In one 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 disposed in the mounting groove, the controller is electrically connected to the sensor and the display respectively, and the display is used to display the inner diameter of the catheter body 1.

[0068] Specifically, the display can be installed on the top or side wall of the catheter body 1, or it can be electrically connected to the outside of the catheter body 1.

[0069] This invention places the sensor in the mounting slot, and the controller is electrically connected to the sensor and the display respectively. The inner diameter of the catheter body 1 is directly displayed on the display, which facilitates observation by medical staff and provides convenience of use.

[0070] While specific embodiments of the invention have been described in detail by way of examples, those skilled in the art should understand that the examples are for illustrative purposes only and not intended to limit the scope of the invention. Those skilled in the art should understand that modifications can be made to the above embodiments without departing from the scope and spirit of the invention. The scope of the invention is defined by the appended claims.

Claims

1. A central venous catheter with an adjustable inner diameter, characterized in that, include: Catheter body, adjustment assembly, and limiting assembly; The catheter body includes multiple arc-shaped plates and multiple pleated plates, and the arc-shaped plates and the pleated plates are arranged alternately in sequence. The radial directions of the arc-shaped plates and the radial directions of the pleated plates are provided with interconnected mounting grooves. The adjustment assembly is disposed in the mounting groove, and multiple adjustment assemblies are connected in sequence to form a ring 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. 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 that the first folding plate and the second folding plate unfold or fold. The limiting component is disposed on the adjusting part and is used to limit the movement of the adjusting part. The adjustment unit includes a movable plate, a connecting sleeve, a rack, a transmission gear, a connecting rod, and a knob. The arc-shaped block has a connecting hole inside. The first end of the movable plate is movably disposed in the connecting hole. The rack is disposed on the outer peripheral wall of the movable plate. The second end of the movable plate is inserted into the connecting sleeve. The second ends of the first folding plate and the second folding plate are connected to the top and bottom of the movable plate, respectively. The transmission gear meshes with the rack, the connecting rod is connected to the transmission gear, the connecting rod passes through the conduit body in the axial direction and is connected to the knob, and the knob is located at the top of the conduit body.

2. The adjustable-diameter central venous catheter according to claim 1, characterized in that, The adjustable inner diameter central venous catheter also includes an outer sleeve, which is fitted over the outside of the catheter body. The outer sleeve is made of medical-grade polyurethane and is elastic. 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, characterized in that, The adjustable-diameter central venous catheter also includes an annular membrane disposed 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 annular membrane is made of silicone and has a thickness of 50 μm.

5. The adjustable inner diameter central venous catheter according to claim 1, characterized in that, The pleated plate, the first folded plate, and the second folded plate are all wavy in shape.

6. The adjustable inner diameter central venous catheter according to claim 1, characterized in that, The mounting groove is provided in multiple ways, and the multiple mounting grooves are spaced apart along the axial direction of the conduit body. The annular structure formed by the multiple adjustment components is respectively disposed in the multiple mounting grooves, and the length of the mounting groove is equal to the maximum height of the adjustment component.

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

8. The adjustable-diameter central venous catheter according to claim 1, characterized in that, The limiting component includes a groove and a ball bearing. The groove is disposed on the top of the movable plate and is evenly spaced along the length of the movable plate. The ball bearing is disposed within the groove.

9. The adjustable inner diameter central venous catheter according to claim 1, characterized in that, The adjustable-diameter central venous catheter also includes a sensor, a controller, and a display. The sensor is disposed in the mounting slot, and the controller is electrically connected to both the sensor and the display. The display is used to show the inner diameter of the catheter body.

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