Disposable central venous catheter and catheter positioning device thereof

Abstract

The invention relates to the technical field of medical equipment, and discloses a disposable central venous catheter and a catheter positioning device thereof.The disposable central venous catheter comprises a supporting frame, the inner wall of the supporting frame is fixedly connected with a placement plate, the outer wall of the placement plate is rotatably connected with a screwing column, and the outer wall of the screwing column is fixedly connected with a forward and reverse screw rod; the outer wall of the positive and negative screw rod is rotatably connected to the interior of the placing plate, the outer wall of the positive and negative screw rod is in threaded connection with a moving block, linkage plates are rotatably connected to the two sides of the upper surface of the moving block, sliding plates are rotatably connected to the lower surfaces of the linkage plates, and sliding rails are fixedly connected to the inner wall of the supporting frame. By rotating a screwing column, a positive and negative screw rod is driven to rotate, moving blocks on the two sides of the outer wall of the screw rod are promoted to move in a centering mode, then a sliding plate is driven to move in a centering mode, a frame plate is driven to move in a centering mode on the inner wall of a placing plate till the frame plate drives a sponge support to clamp limbs, and therefore the effects of avoiding limb shaking and effectively improving the treatment effect and nursing quality are achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of medical devices, and particularly to a disposable central venous catheter and its catheter positioning device. Background Art

[0002] In the modern medical field, central venous catheterization is a very common and crucial operation, which is widely used in multiple aspects such as intensive care, intravenous nutritional support, chemotherapy, and hemodynamic monitoring. The use of disposable central venous catheters can effectively reduce the risk of cross-infection and ensure the safety of patients. However, during catheterization, limb tremors of patients can easily cause deviation of the catheter position, affecting the treatment effect and even leading to serious complications.

[0003] The existing fixation methods mostly restrain the patient's limbs with bandages, which are difficult to effectively fix the patient and easily cause the catheter to shift or fall out during the treatment process. This not only interferes with the treatment process but also may require re-catheterization, increasing the patient's pain and medical costs. Summary of the Invention

[0004] Aiming at the deficiencies of the prior art, the present invention provides a disposable central venous catheter and its catheter positioning device, which solves the problems of difficulty in effectively fixing the patient, increasing the patient's pain and medical costs.

[0005] To achieve the above objectives, the present invention is realized through the following technical solutions: A catheter positioning device, including a support frame, an inner wall of the support frame is fixedly connected with a placement plate, an outer wall of the placement plate is rotatably connected with a screwing column, an outer wall of the screwing column is fixedly connected with a positive and negative lead screw, an outer wall of the positive and negative lead screw is rotatably connected inside the placement plate, an outer wall of the positive and negative lead screw is threadedly connected with a moving block, both sides of an upper surface of the moving block are rotatably connected with linkage plates, a lower surface of the linkage plate is rotatably connected with a sliding plate, an inner wall of the support frame is fixedly connected with a slide rail, an inside of the sliding plate is slidably connected to an outer wall of the slide rail, an upper surface of the sliding plate is fixedly connected with a frame plate, an outer wall of the frame plate is fixedly connected with a sponge holder, and a guiding component is arranged on an upper surface of the support frame.

[0006] Preferably, the guiding component includes a guide rail, a lower surface of the guide rail is fixedly connected to an upper surface of the support frame, an outer wall of the guide rail is slidably connected with a movable frame, an outer wall of the movable frame is fixedly connected with a cross plate, a catheter positioning mechanism is arranged on a lower surface of the cross plate, and a limiting plate is fixedly connected to an outer wall of the movable frame.

[0007] Preferably, the guiding assembly further includes a first handwheel, the outer wall of the first handwheel is rotatably connected to the outer wall of the movable frame, the outer wall of the first handwheel is fixedly connected to a transmission rod, the outer wall of the transmission rod is rotatably connected to the inside of the movable frame, both outer walls of the transmission rod are fixedly connected to a first bevel gear, the outer wall of the first bevel gear is meshed with a second bevel gear, the lower surface of the second bevel gear is rotatably connected to the upper surface of the limiting plate, the inside of the second bevel gear is fixedly connected to a connecting column, the lower outer wall of the connecting column is fixedly connected to a moving gear, and the outer wall of the moving gear is meshed with a rack, and the outer wall of the rack is fixedly connected to the inner wall of the support frame.

[0008] Preferably, the catheter positioning mechanism includes a positioning semi-circle, and the outer wall of the positioning semi-circle is slidably connected to the outer wall of the transmission rod.

[0009] Preferably, the catheter positioning mechanism further includes a second handwheel, the outer wall of the second handwheel is rotatably connected to the outer wall of the movable frame, the outer wall of the second handwheel is fixedly connected to a threaded rod, both outer walls of the threaded rod are rotatably connected to the inside of the movable frame, and the outer wall of the threaded rod is threadedly connected to the inside of the positioning semi-circle.

[0010] Preferably, semi-arc frames are fixedly connected to both outer walls of the positioning semi-circle, an inclined frame is slidably connected to the outer wall of the semi-arc frame, a limiting column is fixedly connected to the inner wall of the middle side of the arc surface of the inclined frame, and the outer wall of the limiting column is slidably connected to the inner wall of the semi-arc frame.

[0011] Preferably, a third handwheel is rotatably connected to the outer wall of the inclined frame, a worm is fixedly connected to the outer wall of the third handwheel, the outer wall of the worm is rotatably connected to the inner wall of the inclined frame, the outer wall of the worm is meshed with a semi-worm gear, and the inside of the semi-worm gear is fixedly connected to the outer wall of the positioning semi-circle.

[0012] Preferably, a sliding column is fixedly connected to the inner wall of the inclined frame, a first snap ring is fixedly connected to one outer wall of the sliding column, a second snap ring is slidably connected to the other side of the sliding column, a spring is arranged between the second snap ring and the first snap ring, and the inner wall of the spring is slidably connected to the outer wall of the sliding column.

[0013] A disposable central venous catheter includes a catheter body, the catheter body is made of medical-grade TPU material, a guiding needle is arranged at one end of the catheter body, the guiding needle is made of stainless steel and is used for penetrating the skin and tissue, and a handle is fixedly connected to the tail end of the guiding needle, and the handle is used for holding and pushing the guiding needle.

[0014] Preferably, an infusion cavity and a pressure monitoring cavity are arranged on the other side of the catheter body, the infusion cavity is used for infusion, and the pressure monitoring cavity is used for monitoring pressure.

[0015] Working principle: When the device is needed, first insert the catheter into the second snap ring and pass it through the first snap ring, then place the patient's venous limb on the sponge support. Rotate the screwing column, which can drive the positive and negative lead screw to rotate, thereby driving the moving blocks on both sides of its outer wall to move towards the center. The moving blocks can pull the sliding plates on both sides of the slide rail to move towards the center through the linkage plate, thereby driving the support plate to move towards the center inside the placement plate until the support plate drives the sponge support to clamp the limb. Moreover, the sponge support can improve comfort, thus enhancing the patient's usage experience, avoiding limb tremors, and improving the overall treatment effect and nursing quality.

[0016] After fixing the patient's limb, turn the first handwheel, which can drive the transmission rod to rotate. Through the transmission rod, the first bevel gears at both ends are driven to rotate synchronously. Thus, the reverse force generated by the meshing connection between the first bevel gear and the second bevel gear drives the moving gear to rotate through the connecting column. Then, the moving gear drives the movable frame to slide on the outer wall of the guide rail through the rack to longitudinally move the catheter fixed by the first snap ring and the second snap ring. At the same time, turn the second handwheel, which can drive the lead screw to rotate, to drive the positioning semi-circle to slide on the outer wall of the transmission rod, realizing the lateral movement of the catheter, so as to achieve the effect of multi-axis positioning, optimize the position of the guiding needle, and improve the flexibility and accuracy of catheter placement.

[0017] At the same time, turn the third handwheel, which can drive the worm to rotate. The rotation of the worm drives the inclined frame to slide arcuately on the outer wall of the semi-circular frame through the reverse force with the semi-worm wheel, and drives the limit post to slide on the inner wall of the semi-circular frame to ensure the stability of the inclined frame. Thus, the arcuate sliding of the inclined frame can adjust the inclination angle of the first snap ring and the second snap ring to better adapt to the blood vessel direction and effectively improve the accuracy of puncture.

[0018] After puncture, the catheter is fixed by the first snap ring and the second snap ring, which can ensure the stability of the catheter. At the same time, when the catheter is bent, the second snap ring slides on the outer wall of the sliding column through the spring to buffer the bending force, prevent the catheter from shifting, and reduce the risk of catheter displacement and dislodgment.

[0019] The present invention provides a disposable central venous catheter and its catheter positioning device. It has the following beneficial effects: 1. By rotating the screwing column of the present invention, the positive and negative lead screw is driven to rotate, prompting the moving blocks on both sides of its outer wall to move towards the center, and then driving the sliding plates to move towards the center, driving the support plate to move towards the center inside the placement plate until the support plate drives the sponge support to clamp the limb, so as to avoid limb tremors and effectively improve the treatment effect and nursing quality.

[0020] 2. The present invention rotates the first hand wheel to drive the first bevel gears at both ends to rotate synchronously through the transmission rod, drives the moving gear to rotate through the second bevel gear, and the moving gear drives the movable frame to slide on the outer wall of the guide rail through the rack to achieve longitudinal movement of the catheter. At the same time, the second hand wheel is rotated to drive the screw column to rotate, so that the positioning semicircle slides on the outer wall of the transmission rod to achieve lateral movement of the catheter, thereby achieving multi-axis positioning of the catheter, optimizing the position of the guide needle, and improving the flexibility and accuracy of catheter placement.

[0021] 3. The present invention drives the worm to rotate by turning the third hand wheel. The reverse force between the worm and the semi-worm wheel causes the tilting frame to slide in an arc shape on the outer wall of the semi-arc frame. At the same time, the limit column slides on the inner wall of the semi-arc frame to ensure the stability of the tilting frame. The arc-shaped sliding of the tilting frame can adjust the inclination angle of the two clamping rings to make it better conform to the direction of the blood vessel, effectively improve the puncture accuracy, and help the medical operation to proceed smoothly.

[0022] 4. The present invention utilizes two clamping rings to fix the catheter, which can ensure its stability. When the catheter is bent, the rear clamping ring will slide on the outer wall of the sliding column with the help of a spring to buffer the bending force, effectively dispersing the stress caused by the bending of the catheter, avoiding displacement of the catheter due to uneven force, reducing the risk of displacement and dislocation of the catheter, and ensuring the reliability of the catheter during use. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 is a three-dimensional diagram of the catheter positioning device of the present invention; Figure 2 It is a schematic diagram of the local structure of the moving block of the catheter positioning device of the present invention; Figure 3 It is a schematic diagram of the partial structure of the frame plate of the catheter positioning device of the present invention; Figure 4 It is a schematic diagram of the local structure of the movable frame of the catheter positioning device of the present invention; Figure 5 It is a schematic diagram of the partial structure of the rack of the catheter positioning device of the present invention; Figure 6 It is a partial structural schematic diagram of the tilt frame of the catheter positioning device of the present invention; Figure 7 It is a schematic diagram of the local structure of the sliding column of the catheter positioning device of the present invention; Figure 8 It is a stereoscopic view of a disposable central venous catheter of the present invention.

[0024] Among them, 1. support frame; 2. placement plate; 3. screwing column; 4. positive and negative lead screw; 5. moving block; 6. linkage plate; 7. sliding plate; 8. slide rail; 9. frame plate; 10. sponge support; 11. guide rail; 12. movable frame; 13. cross plate; 14. first handwheel; 15. transmission rod; 16. first bevel gear; 17. limiting plate; 18. connecting column; 19. second bevel gear; 20. moving gear; 21. rack; 22. second handwheel; 23. screw column; 24. positioning semi-circle; 25. semi-arc frame; 26. inclined frame; 27. limiting column; 28. third handwheel; 29. worm; 30. semi-worm gear; 31. sliding column; 32. first snap ring; 33. second snap ring; 34. spring; 35. catheter body; 36. guiding needle; 37. handle; 38. infusion cavity; 39. pressure monitoring cavity. Detailed implementation manners

[0025] The technical solutions of the present invention will be clearly and completely described below in conjunction with the drawings of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0026] Please refer to the attached Figure 1 - attached Figure 4, an embodiment of the present invention provides a catheter positioning device, which includes a support frame 1. The inner wall of the support frame 1 is fixedly connected with a placement plate 2. The outer wall of the placement plate 2 is rotatably connected with a screwing column 3. The outer wall of the screwing column 3 is fixedly connected with a positive and negative lead screw 4. The outer wall of the positive and negative lead screw 4 is rotatably connected inside the placement plate 2. The outer wall of the positive and negative lead screw 4 is threadedly connected with a moving block 5. Both sides of the upper surface of the moving block 5 are rotatably connected with linkage plates 6. The lower surface of the linkage plate 6 is rotatably connected with a sliding plate 7. The inner wall of the support frame 1 is fixedly connected with a slide rail 8. The inside of the sliding plate 7 is slidably connected to the outer wall of the slide rail 8. The upper surface of the sliding plate 7 is fixedly connected with a frame plate 9. The outer wall of the frame plate 9 is fixedly connected with a sponge holder 10. A guiding component is arranged on the upper surface of the support frame 1; the guiding component includes a guide rail 11. The lower surface of the guide rail 11 is fixedly connected to the upper surface of the support frame 1. The outer wall of the guide rail 11 is slidably connected with a movable frame 12. The outer wall of the movable frame 12 is fixedly connected with a cross plate 13. A catheter positioning mechanism is arranged on the lower surface of the cross plate 13. The outer wall of the movable frame 12 is fixedly connected with a limiting plate 17; the guiding component further includes a first handwheel 14. The outer wall of the first handwheel 14 is rotatably connected to the outer wall of the movable frame 12. The outer wall of the first handwheel 14 is fixedly connected with a transmission rod 15. The outer wall of the transmission rod 15 is rotatably connected inside the movable frame 12. Both sides of the outer wall of the transmission rod 15 are fixedly connected with a first bevel gear 16. The outer wall of the first bevel gear 16 is meshed with a second bevel gear 19. The lower surface of the second bevel gear 19 is rotatably connected to the upper surface of the limiting plate 17. The inside of the second bevel gear 19 is fixedly connected with a connecting column 18. The lower side outer wall of the connecting column 18 is fixedly connected with a moving gear 20. The outer wall of the moving gear 20 is meshed with a rack 21. The outer wall of the rack 21 is fixedly connected to the inner wall of the support frame 1.

[0027] Specifically, the support frame 1 plays a role of fixedly supporting the placement plate 2. The placement plate 2 can support the position of the limb. At the same time, when the screwing column 3 rotates, it can drive the positive and negative lead screw 4 to rotate. The positive and negative lead screw 4 can drive the moving blocks 5 on both sides of it to move synchronously and relatively inside the inner wall of the support frame 1 through threaded connection. Thus, the moving block 5 can drive the sliding plates 7 on both sides of the slide rail 8 to slide relatively through the linkage plates 6, and the positioning of the patient's limb is realized through the frame plate 9, ensuring that the limb is located at the central position of the inner wall of the support frame 1. At the same time, the sponge holder 10 can improve the comfort of the patient, protect the skin and reduce the pressure. At the same time, the guiding component can position the longitudinal position of the catheter to the puncture position of the patient's limb; Turn the first handwheel 14, and the first handwheel 14 can drive the transmission rod 15 to rotate. Thus, the transmission rod 15 can drive the first bevel gears 16 on both sides to rotate synchronously and in the same direction. After that, the first bevel gears 16 can drive the second bevel gear 19 to rotate on the upper surface of the limit plate 17 through meshing connection. The movable frame 12 plays a role in fixedly supporting the limit plate 17. The rotation of the second bevel gear 19 drives the movable gear 20 to rotate. Thus, the movable gear 20 drives the movable frame 12 to slide on the outer wall of the guide rail 11 through the reaction force with the rack 21, and then drives the catheter positioning mechanism to a suitable vein puncture position through the cross plate 13, achieving the effect of improving the flexibility of the catheter positioning position.

[0028] Refer to the appendix Figure 4 - appendix Figure 6 The catheter positioning mechanism includes a positioning semi-circle 24, and the outer wall of the positioning semi-circle 24 is slidably connected to the outer wall of the transmission rod 15; the catheter positioning mechanism further includes a second handwheel 22, the outer wall of the second handwheel 22 is rotatably connected to the outer wall of the movable frame 12, a screw column 23 is fixedly connected to the outer wall of the second handwheel 22, both ends of the outer wall of the screw column 23 are rotatably connected to the inside of the movable frame 12, and the outer wall of the screw column 23 is threadedly connected to the inside of the positioning semi-circle 24.

[0029] Specifically, the transmission rod 15 can support the sliding position of the positioning semi-circle 24 to ensure the stability of the positioning semi-circle 24 during movement. The movable frame 12 can support the rotation position of the second handwheel 22. When the second handwheel 22 is rotated, the second handwheel 22 can drive the screw column 23 to rotate, and the movable frame 12 can support the rotation position of the screw column 23. Thus, the positioning semi-circle 24 slides on the outer wall of the transmission rod 15 through the reaction force generated by the thread between the positioning semi-circle 24 and the screw column 23, realizing the lateral positioning of the catheter.

[0030] Refer to the appendix Figure 6 On both outer walls of the positioning semi-circle 24, a semi-arc frame 25 is fixedly connected. An inclined frame 26 is slidably connected to the outer wall of the semi-arc frame 25. A limit column 27 is fixedly connected to the inner wall of the middle side of the arc surface of the inclined frame 26, and the outer wall of the limit column 27 is slidably connected to the inner wall of the semi-arc frame 25; a third handwheel 28 is rotatably connected to the outer wall of the inclined frame 26, a worm 29 is fixedly connected to the outer wall of the third handwheel 28, the outer wall of the worm 29 is rotatably connected to the inner wall of the inclined frame 26, and the outer wall of the worm 29 is meshed with a semi-worm gear 30, and the inside of the semi-worm gear 30 is fixedly connected to the outer wall of the positioning semi-circle 24.

[0031] Specifically, the positioning semi-circle 24 has a fixed supporting effect on the semi-arc frame 25, and when the positioning semi-circle 24 moves, it can synchronously drive the semi-arc frame 25 to move. The inclined frame 26 has a fixed supporting effect on the limiting column 27, so as to limit the sliding position of the inclined frame 26 on the inner wall of the semi-arc frame 25 through the limiting column 27. The inclined frame 26 can support the rotating position of the third handwheel 28, and turning the third handwheel 28 can drive the worm 29 to rotate. Thus, the worm 29 drives the inclined frame 26 to perform an arc-shaped sliding through the reverse force between the worm 29 and the semi-worm wheel 30 to adjust the inclination angle of the catheter.

[0032] Refer to the appendix Figure 6 and the appendix Figure 7 As shown in the figure, a sliding column 31 is fixedly connected to the inner wall of the inclined frame 26. A first snap ring 32 is fixedly connected to the outer wall of one side of the sliding column 31. A second snap ring 33 is slidably connected to the other side of the sliding column 31. A spring 34 is arranged between the second snap ring 33 and the first snap ring 32, and the inner wall of the spring 34 is slidably connected to the outer wall of the sliding column 31.

[0033] Specifically, the inclined frame 26 can support the position of the sliding column 31, and the sliding column 31 has a fixed supporting effect on the first snap ring 32. The first snap ring 32 can position the front end position of the catheter, and the sliding column 31 can support the sliding position of the second snap ring 33. At the same time, the second snap ring 33 can fix the rear end position of the catheter, and a spring 34 is arranged between the first snap ring 32 and the second snap ring 33, which can buffer when the catheter is bent and deformed, thus reducing the risk of catheter displacement and extrusion.

[0034] Refer to the appendix Figure 8 As shown in the figure, a disposable central venous catheter includes a catheter body 35. The catheter body 35 is made of medical-grade TPU material. A guiding needle 36 is arranged at one end of the catheter body 35. The guiding needle 36 is made of stainless steel and is used to penetrate the skin and tissue. A handle 37 is fixedly connected to the tail end of the guiding needle 36, and the handle 37 is used for holding and pushing the guiding needle 36.

[0035] Specifically, the catheter body 35 made of medical-grade TPU material has good biocompatibility and flexibility, which can reduce the irritation and damage to human tissues. The guiding needle 36 made of stainless steel arranged at one end, with its high strength and sharpness, can effectively penetrate the skin and tissue to open a channel for the catheter body 35 to enter the human body. The handle 37 fixedly connected to the tail end of the guiding needle 36 is convenient for medical staff to hold, accurately control the pushing force and direction, so that the guiding needle 36 can successfully complete the puncture operation, thus helping the catheter body 35 to accurately reach the predetermined position and laying a foundation for subsequent medical operations such as infusion and monitoring.

[0036] On the other side of the catheter body 35, there are an infusion cavity 38 and a pressure monitoring cavity 39. The infusion cavity 38 is used for infusion, and the pressure monitoring cavity 39 is used for pressure monitoring.

[0037] Specifically, the infusion cavity 38 shoulders the important task of delivering the liquid medicine, and can accurately input various drugs into the human body according to the treatment needs to meet the treatment needs of patients. The pressure monitoring cavity 39, on the other hand, monitors the pressure changes at the position of the catheter in real time, providing important physiological data for medical staff to timely understand the patient's physical condition and improve the safety and effectiveness of medical operations.

[0038] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principle and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A catheter positioning device, comprising a support frame (1), characterized in that: The inner wall of the support frame (1) is fixedly connected to a placement plate (2), the outer wall of the placement plate (2) is rotatably connected to a twisting column (3), the outer wall of the twisting column (3) is fixedly connected to a positive and negative screw rod (4), the outer wall of the positive and negative screw rod (4) is rotatably connected to the inside of the placement plate (2), the outer wall of the positive and negative screw rod (4) is threadedly connected to a moving block (5), both sides of the upper surface of the moving block (5) are rotatably connected to linkage plates (6), the lower surface of the linkage plate (6) is rotatably connected to a slide plate (7), the inner wall of the support frame (1) is fixedly connected to a slide rail (8), the inside of the slide plate (7) is slidably connected to the outer wall of the slide rail (8), the upper surface of the slide plate (7) is fixedly connected to a frame plate (9), the outer wall of the frame plate (9) is fixedly connected to a sponge holder (10), and the upper surface of the support frame (1) is provided with a guide assembly.

2. The catheter positioning device according to claim 1, characterized in that: The guide assembly comprises a guide rail (11), the lower surface of the guide rail (11) is fixedly connected to the upper surface of the support frame (1), the outer wall of the guide rail (11) is slidably connected to a movable frame (12), the outer wall of the movable frame (12) is fixedly connected to a transverse plate (13), the lower surface of the transverse plate (13) is provided with a catheter positioning mechanism, and the outer wall of the movable frame (12) is fixedly connected to a limiting plate (17).

3. The catheter positioning device according to claim 2, characterized in that: The guide assembly further comprises a first hand wheel (14), the outer wall of the first hand wheel (14) being rotatably connected to the outer wall of the movable frame (12), the outer wall of the first hand wheel (14) being fixedly connected to a transmission rod (15), the outer wall of the transmission rod (15) being rotatably connected to the inside of the movable frame (12), both side outer walls of the transmission rod (15) being fixedly connected to first bevel gears (16), the outer wall of the first bevel gear (16) being meshingly connected to a second bevel gear (19), the lower surface of the second bevel gear (19) being rotatably connected to the upper surface of the limit plate (17), the inside of the second bevel gear (19) being fixedly connected to a connecting column (18), the lower outer wall of the connecting column (18) being fixedly connected to a moving gear (20), the outer wall of the moving gear (20) being meshingly connected to a rack (21), the outer wall of the rack (21) being fixedly connected to the inner wall of the support frame (1).

4. The catheter positioning device according to claim 2, characterized in that: The catheter positioning mechanism comprises a positioning semicircle (24), the outer wall of the positioning semicircle (24) being slidably connected to the outer wall of the transmission rod (15).

5. The catheter positioning device according to claim 4, characterized in that: The catheter positioning mechanism further comprises a second hand wheel (22), the outer wall of the second hand wheel (22) being rotatably connected to the outer wall of the movable frame (12), the outer wall of the second hand wheel (22) being fixedly connected to a threaded post (23), the outer walls at both ends of the threaded post (23) being rotatably connected to the inside of the movable frame (12), and the outer wall of the threaded post (23) being threadedly connected to the inside of the positioning semicircle (24).

6. The catheter positioning device according to claim 5, characterized in that: The outer walls on both sides of the positioning semicircle (24) are fixedly connected to a semi-arc frame (25), the outer wall of the semi-arc frame (25) is slidably connected to a tilting frame (26), the inner wall of the middle side of the arc surface of the tilting frame (26) is fixedly connected to a limiting column (27), and the outer wall of the limiting column (27) is slidably connected to the inner wall of the semi-arc frame (25).

7. The catheter positioning device according to claim 6, characterized in that: The outer wall of the tilting frame (26) is rotatably connected to a third hand wheel (28), the outer wall of the third hand wheel (28) is fixedly connected to a worm (29), the outer wall of the worm (29) is rotatably connected to the inner wall of the tilting frame (26), the outer wall of the worm (29) is meshingly connected to a half worm wheel (30), and the interior of the half worm wheel (30) is fixedly connected to the outer wall of the positioning semicircle (24).

8. The catheter positioning device according to claim 7, characterized in that: A sliding column (31) is fixedly connected to the inner wall of the tilting frame (26), a first clamping ring (32) is fixedly connected to the outer wall of one side of the sliding column (31), a second clamping ring (33) is slidably connected to the other side of the sliding column (31), a spring (34) is provided between the second clamping ring (33) and the first clamping ring (32), and the inner wall of the spring (34) is slidably connected to the outer wall of the sliding column (31).

9. A disposable central venous catheter, characterized in that: A catheter positioning device for use in any one of claims 1 to 8, comprising a catheter body (35), the catheter body (35) being made of medical-grade TPU material, a guide needle (36) being provided at one end of the catheter body (35), the guide needle (36) being made of stainless steel and being used for penetrating skin and tissue, a handle (37) being fixedly connected to the rear end of the guide needle (36), the handle (37) being used for holding and advancing the guide needle (36).

10. The disposable central venous catheter according to claim 9, characterized in that: An infusion cavity (38) and a pressure monitoring cavity (39) are provided on the other side of the catheter body (35); the infusion cavity (38) is used for infusion, and the pressure monitoring cavity (39) is used for monitoring pressure.

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