Mini midline catheter fixator

Abstract

The invention belongs to the technical field of midline catheters, and discloses a mini midline catheter fixator which comprises a cylindrical shell and further comprises a massage fixing assembly arranged on the cylindrical shell and a catheter fixing assembly arranged on one side of the massage fixing assembly. A single air pump and an air circulation pipeline are integrated, semi-automatic operation of the device is achieved, the air pump system can adapt to the thickness of the arm of a patient by driving the air bags to expand alternately, the device is easily fixed, meanwhile, blood circulation disorder caused by long-time compression is avoided, in addition, the design can also provide a massage effect on the arm, and the patient can feel comfortable. The problems that in the prior art, manual adjusting and fixing are conducted, and the skin is pressed for a long time are effectively solved, the effect of the air pump is reflected in that the medical cotton cushion can be pushed to cover a puncture point so as to protect a wound from being polluted by the outside, the fixator can be repeatedly used by replacing the medical cotton cushion, and the fixing effect is good. The problem of resource waste caused by disposable use of a fixator in the prior art is solved.

Description

Technical Field

[0001] The invention belongs to the technical field of midline catheters, and in particular relates to a mini midline catheter fixer. Background Art

[0002] Mini midline catheter is a peripheral intravenous infusion device between short cannula and medium-long catheter. It is usually placed in the superficial vein of the forearm using conventional puncture technology, or in the deep vein of the middle upper arm using ultrasound guidance technology. Its tip does not exceed the axilla. When the mini midline wire is in use, it is generally necessary to use a fixator to safely protect the midline wire to ensure the use effect. The existing mini midline catheter fixator has some problems during use: 1. It cannot be reused, resulting in great waste; 2. The fixator needs to be manually adjusted according to the thickness of the patient's arm; 3. Pressuring the same skin area for a long time will cause poor blood circulation.

[0003] Therefore, a mini midline catheter fixator that can be reused, can automatically adapt to arms of different thicknesses, and will not cause poor blood circulation is needed to solve these problems. Summary of the invention

[0004] In view of the above situation, in order to overcome the defects of the prior art, this solution cleverly integrates a single air pump and a gas circulation pipeline to realize semi-automatic operation of the device. The air pump system can adapt to the thickness of the patient's arm by driving the airbag to expand alternately, thereby easily fixing the device and avoiding blood circulation disorders caused by long-term compression. In addition, the design can also provide a massage effect on the arm, effectively solving the problems of manual adjustment and fixation and long-term skin pressure in the prior art. The function of the air pump is also reflected in the ability to push the medical cotton pad to cover the puncture point to protect the wound from external contamination. By replacing the medical cotton pad, the fixator achieves reusability, overcoming the problem of resource waste caused by the one-time use of the fixator in the prior art.

[0005] The technical solution adopted by the present invention is as follows: a mini midline catheter holder, comprising a cylindrical shell, which serves as a frame of the entire holder and provides structural stability, and further comprising a massage fixing assembly arranged on the cylindrical shell, a catheter fixing assembly arranged on one side of the massage fixing assembly, and a storage assembly arranged on one side of the catheter fixing assembly, wherein the massage fixing assembly is connected to a pipeline of the storage assembly; The massage fixing assembly includes an inflatable fixing unit arranged on the surface of a cylindrical shell and an air outlet reversing unit arranged inside the inflatable fixing unit. The inflatable fixing unit and the air outlet reversing unit are in transmission connection. The inflatable fixing unit includes an air pump fixedly arranged on the surface of the cylindrical shell, an air outlet pipe 1 fixedly arranged at the air outlet end of the air pump, and an air inlet pipe 1 fixedly arranged at the air inlet end of the air pump. The air pump is a power source, and drives the airbag to expand through compressed air to achieve the fixing and massage functions. The catheter fixing assembly includes a needle protection unit rotatably arranged on the surface of a cylindrical shell and a fixed catheter unit arranged on the surface of the cylindrical shell, the needle protection unit is connected to a pipeline of an air outlet pipe, and the fixed catheter unit is connected to a pipeline of an air outlet pipe.

[0006] As a preferred technical solution of the present scheme, an air filling tube 1 is fixedly provided on the surface of the air outlet pipe 1, an air bag 1 is fixedly provided on the inner wall of the cylindrical shell, the air filling tube 1 is connected to the interior of the air bag 1, an air filling tube 2 is fixedly provided on the air outlet pipe 1, an air bag 2 is fixedly provided on the inner wall of the cylindrical shell, the air filling tube 2 is connected to the interior of the air bag 2, the air bag 1 and the air bag 2 are arranged alternately, an air inlet pipe 2 is fixedly provided on the surface of the air inlet pipe 1, and an air outlet pipe 2 is fixedly provided on the surface of the air outlet pipe 1.

[0007] As a preferred technical solution of the present scheme, the air outlet reversing unit includes a wheel cover fixedly arranged on an inner wall of an air outlet pipe, an impeller rotatably arranged inside the wheel cover, a ventilation disk coaxially fixedly arranged on the side wall of the impeller, and a partition fixedly arranged on an inner wall of the air outlet pipe. The ventilation disk rotates coaxially with the impeller and has holes for directional airflow to realize alternating flow direction of the gas. The partition cooperates with the ventilation disk to ensure that the gas flows along a predetermined path.

[0008] As a preferred technical solution of the present scheme, an air inlet short pipe is fixedly provided on the outer wall of the wheel cover, and an air outlet pipe three is fixedly provided on the outer wall of the wheel cover, one end of the air outlet pipe three is connected to the interior of the wheel cover, and the other end of the air outlet pipe three passes through the air outlet pipe one.

[0009] As a preferred technical solution of the present scheme, the needle protection unit includes a needle cover rotatably set on the surface of the cylindrical shell, an airbag three fixedly set on the bottom wall of the needle cover, an airbag four fixedly set on the bottom wall of the needle cover and a medical cotton pad detachably set on the surface of the airbag three. The needle cover covers the puncture point to protect the puncture site from contamination and collision. An air hole one is through-opened inside the needle cover, the other end of the inflation tube one penetrates the cylindrical shell and corresponds to the air hole one, and the air hole one is connected with the inside of the airbag three. An air hole two is through-opened inside the needle cover, the other end of the inflation tube two penetrates the cylindrical shell and corresponds to the air hole two, and the air hole two is connected with the inside of the airbag four. The airbags three and four are inflated alternately to push the medical cotton pad to cover the puncture point to provide additional protection.

[0010] As a preferred technical solution of the present invention, the fixed catheter unit includes a catheter bracket rotatably arranged on the surface of a cylindrical shell, a slide groove 1 fixedly arranged on one side of the catheter bracket, a telescopic rod 1 fixedly arranged on the cylindrical shell and a slider 2 slidably arranged on the surface of the cylindrical shell. The catheter bracket is used to fix the catheter to ensure the stability and correct position of the catheter. The slider 2 controls the lifting and lowering of the catheter bracket to facilitate operations such as disinfection of the catheter and connection of an infusion pump. The telescopic end of the telescopic rod 1 is slidably and rotatably arranged in the slide groove 1. The interior of the telescopic rod 1 is connected with the interiors of the outlet pipe 2 and the inlet pipe 2. The slider 2 corresponds to the outlet pipe 2 and the inlet pipe 2.

[0011] As a preferred technical solution of the present scheme, the storage component includes a storage cover rotatably arranged on the surface of the cylindrical shell, a slide groove 2 fixedly arranged on one side of the storage cover, a telescopic rod 2 fixedly arranged on the cylindrical shell and a slider 3 slidably arranged on the surface of the cylindrical shell. A storage space is provided under the storage cover for storing medical cotton pads or other small medical supplies. The slider 3 is used to control the in and out of air flow and control the opening and closing of the storage cover. The telescopic end of the telescopic rod 2 is slidably and rotatably arranged in the slide groove 2. The interior of the telescopic rod 2 is connected with the interiors of the air outlet pipe 2 and the air inlet pipe 2. The slider 3 corresponds to the air outlet pipe 2 and the air inlet pipe 2.

[0012] As a preferred technical solution of the present invention, a slider 1 is provided on the needle cover for sliding in opposite directions, and a spring is fixed between the two sliders 1.

[0013] After adopting the above structure, the beneficial effects of the present invention are as follows: 1. The massage fixation component not only fixes the catheter, but also improves the patient's comfort, which is especially important for patients who need long-term catheter treatment. The design of the massage fixation component also helps to promote local blood circulation and has a certain positive effect on preventing thrombosis. The alternating expansion design reduces skin damage such as blisters and ulcers that may be caused by long-term compression; 2. The medical cotton pad covers the puncture site, providing additional protection and preventing external contamination and collision. By designing a replaceable medical cotton pad, the fixator can be reused, reducing medical waste and reducing long-term use costs; 3. Using the air pump and air bag system, the fixator can automatically adapt to arms of different thicknesses without manual adjustment, which improves the convenience of use; 4. Use the air pump to drive the catheter bracket to rise and fall, which is convenient for medical staff to disinfect the catheter and connect the infusion set; 5. The design of the storage components facilitates the storage of medical supplies and meets the diverse needs of patients and medical staff. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] The accompanying drawings are used to provide a further understanding of the present solution and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention.

[0015] Figure 1 It is a schematic diagram of the overall structure of a mini midline catheter fixer of the present invention; Figure 2 It is a schematic diagram of the connection structure between the air pump and the air outlet pipe 1 in the present invention; Figure 3 It is a schematic diagram of the connection structure between the needle cover and the slider 1 in the present invention; Figure 4 for Figure 3 A magnified view of the local structure at point A in the middle; Figure 5 It is a schematic diagram of the connection structure between the airbag 1 and the inflation tube 1 in the present invention; Figure 6 It is a schematic diagram of the connection structure between the second airbag and the second inflation tube in the present invention; Figure 7 It is a schematic diagram of the connection structure between the spring and the slider 1 in the present invention; Figure 8 It is a schematic diagram of the connection structure between the telescopic rod 1 and the slide slot 1 in the present invention; Fig. 9 It is a schematic diagram of the connection structure between the telescopic rod 2 and the slide slot 2 in the present invention.

[0016] In the accompanying drawings: 1. cylindrical shell; 2. Massage fixing assembly, 21. Air pump, 22. Air outlet pipe 1, 23. Air filling pipe 1, 24. Air filling pipe 2, 25. Air inlet short pipe, 26. Air outlet pipe 2, 27. Air inlet pipe 1, 28. Air inlet pipe 2, 29. Wheel cover, 210. Impeller, 211. Air exchange disc, 212. Baffle, 213. Air bag 1, 214. Air bag 2, 215. Air outlet pipe 3; 3. catheter fixing assembly, 31. catheter bracket, 32. needle cover, 33. airbag three, 34. medical cotton pad, 35. airbag four, 36. air hole one, 37. air hole two, 38. slider one, 39. spring, 310. slide slot one, 311. telescopic rod one, 312. slider two; 4. Storage component, 41. Storage cover, 42. Slide slot 2, 43. Telescopic rod 2, 44. Slider 3. DETAILED DESCRIPTION

[0017] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments; based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0018] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0019] like Figure 1-Figure 9 As shown, a mini midline catheter holder comprises a cylindrical shell 1, a massage fixing assembly 2 arranged on the cylindrical shell 1, a catheter fixing assembly 3 arranged on one side of the massage fixing assembly 2, and a storage assembly 4 arranged on one side of the catheter fixing assembly 3, wherein the massage fixing assembly 2 is connected to the storage assembly 4 through a pipeline; The massage fixing assembly 2 includes an inflatable fixing unit arranged on the surface of the cylindrical shell 1 and an air outlet reversing unit arranged inside the inflatable fixing unit. The inflatable fixing unit and the air outlet reversing unit are transmission-connected. The inflatable fixing unit includes an air pump 21 fixedly arranged on the surface of the cylindrical shell 1, an air outlet pipe 22 fixedly arranged at the air outlet end of the air pump 21, and an air inlet pipe 27 fixedly arranged at the air inlet end of the air pump 21. The catheter fixing assembly 3 includes a needle protection unit rotatably arranged on the surface of the cylindrical shell 1 and a fixed catheter unit arranged on the surface of the cylindrical shell 1, the needle protection unit is connected to the air outlet pipe 22, and the fixed catheter unit is connected to the air outlet pipe 22.

[0020] Among them, an air filling tube 23 is fixedly provided on the surface of the air outlet pipe 22, an air bag 213 is fixedly provided on the inner wall of the cylindrical shell 1, and the air filling tube 23 is connected with the interior of the air bag 213; an air filling tube 24 is fixedly provided on the air outlet pipe 22, an air bag 214 is fixedly provided on the inner wall of the cylindrical shell 1, and the air filling tube 24 is connected with the interior of the air bag 214; the air bags 1 213 and the air bags 2 214 are arranged alternately; an air inlet pipe 28 is fixedly provided on the surface of the air inlet pipe 27, and an air outlet pipe 26 is fixedly provided on the surface of the air outlet pipe 22.

[0021] Among them, the air outlet reversing unit includes a wheel cover 29 fixedly arranged on the inner wall of the air outlet pipe 22, an impeller 210 rotatably arranged inside the wheel cover 29, a ventilation disk 211 coaxially fixedly arranged on the side wall of the impeller 210, and a partition 212 fixedly arranged on the inner wall of the air outlet pipe 22.

[0022] Among them, an air intake short pipe 25 is fixedly provided on the outer wall of the wheel cover 29, and an air outlet pipe 3 215 is fixedly provided on the outer wall of the wheel cover 29. One end of the air outlet pipe 3 215 is connected to the interior of the wheel cover 29, and the other end of the air outlet pipe 3 215 passes through the air outlet pipe 1 22.

[0023] Working process: start the air pump 21, the gas blown by the air pump 21 can flow into the wheel cover 29 through the air inlet short pipe 25, and then drive the impeller 210 to rotate. The rotation of the impeller 210 drives the ventilation disk 211 to rotate. The air flow can pass through the air opening on the ventilation disk 211, and cooperate with the partition 212 to realize the alternating flow of gas to the inflation tube 1 23 and the inflation tube 2 24 into the airbag 1 213 and the airbag 2 214, so as to realize the alternating expansion of the airbag 1 213 and the airbag 2 214. The cylindrical shell 1 can be fixed on the arm with the anti-slip particles on its surface.

[0024] Among them, the needle protection unit includes a needle cover 32 rotatably set on the surface of the cylindrical shell 1, an air bag three 33 fixedly set on the bottom wall of the needle cover 32, an air bag four 35 fixedly set on the bottom wall of the needle cover 32 and a medical cotton pad 34 detachably set on the surface of the air bag three 33, an air hole 1 36 is opened through the inside of the needle cover 32, the other end of the inflation tube 1 23 penetrates the cylindrical shell 1 and corresponds to the air hole 1 36, and the air hole 1 36 is connected with the inside of the air bag three 33, an air hole 2 37 is opened through the inside of the needle cover 32, the other end of the inflation tube 24 penetrates the cylindrical shell 1 and corresponds to the air hole 2 37, and the air hole 2 37 is connected with the inside of the air bag four 35.

[0025] Working process: air flows from inflation tube 1 23 through air hole 1 36 into air bag 3 33, and flows from inflation tube 2 24 through air hole 2 37 into air bag 4 35, so that air bag 3 33 and air bag 4 35 are alternately expanded. The expansion of air bag 3 33 and air bag 4 35 drives the medical cotton pad 34 to move so that the medical cotton pad 34 covers the position of the needle to protect the puncture site.

[0026] Among them, the fixed catheter unit includes a catheter bracket 31 rotatably arranged on the surface of the cylindrical shell 1, a slide groove 310 fixedly arranged on one side of the catheter bracket 31, a telescopic rod 311 fixedly arranged on the cylindrical shell 1 and a slider 312 slidably arranged on the surface of the cylindrical shell 1, the telescopic end of the telescopic rod 311 is slidably and rotatably arranged in the slide groove 310, the interior of the telescopic rod 311 is connected with the interior of the air outlet pipe 26 and the air inlet pipe 28, and the slider 312 corresponds to the air outlet pipe 26 and the air inlet pipe 28.

[0027] Among them, the storage component 4 includes a storage cover 41 rotatably arranged on the surface of the cylindrical shell 1, a slide groove 42 fixedly arranged on one side of the storage cover 41, a telescopic rod 43 fixedly arranged on the cylindrical shell 1 and a slider 44 slidably arranged on the surface of the cylindrical shell 1, the telescopic end of the telescopic rod 43 slides and rotates in the slide groove 42, the interior of the telescopic rod 43 is connected with the interior of the air outlet pipe 26 and the air inlet pipe 28, and the slider 44 corresponds to the air outlet pipe 26 and the air inlet pipe 28.

[0028] Among them, a slider 38 is provided on the needle cover 32 for sliding toward each other, and a spring 39 is fixed between the two sliders 38 .

[0029] During specific use: put the cylindrical shell 1 on the arm where the midline catheter needs to be inserted, place the needle cover 32 at the position where the needle is needed, move the slider 38 to make the two sliders 38 close to each other so that the needle cover 32 can rotate relative to the cylindrical shell 1, rotate the needle cover 32 to expose the skin under the needle cover 32, start the air pump 21, and the gas blown out by the air pump 21 can flow into the wheel cover 29 through the air inlet short pipe 25, thereby driving the impeller 210 to rotate, and the rotation of the impeller 210 drives the ventilation disk 211 to rotate, and the air flow can pass through the air opening on the ventilation disk 211, and the partition 212 can be used to realize the alternating flow of gas to the inflation tube 1 23 and the inflation tube 2 24 into the air bag 1 213 and the air bag 2 214 to realize the alternating expansion of the air bag 1 213 and the air bag 2 214, and the anti-skid particles on its surface can fix the cylindrical shell 1 on the arm, and The alternating expansion can avoid blood blockage caused by long-term compression of the same part of the arm, and can also play a massage role on the arm, reducing skin damage such as blisters and ulcers that may be caused by long-term compression. After the cylindrical shell 1 is fixed, the skin corresponding to the needle cover 32 is punctured. After the puncture is completed, the catheter is clamped to the catheter bracket 31, and then the needle cover 32 is rotated to re-clamp the needle cover 32 to the cylindrical shell 1. The air flows from the inflation tube 1 23 through the air hole 1 36 into the air bag 3 33, and flows from the inflation tube 2 24 through the air hole 2 37 into the air bag 4 35, so that the air bag 3 33 and the air bag 4 35 are alternately expanded. The expansion of the air bag 3 33 and the air bag 4 35 drives the medical cotton pad 34 to move so that the medical cotton pad 34 covers the position where the needle is located. The medical cotton pad 34 covers the puncture position, providing additional protection and preventing external pollution and collision. When infusion is needed, the slider 2 312 is moved so that the slider 2 312 blocks the air inlet pipe 28 but does not block the air outlet pipe 26. Air flows through the air pump 21 through the air outlet pipe 26 and enters the telescopic rod 1 311. The telescopic end of the telescopic rod 1 311 extends, driving the slide 1 310 to rotate and then driving the catheter bracket 31 to rotate, so that the catheter bracket 31 pops out, which is convenient for medical personnel to operate the catheter. When the catheter does not need to be operated, the slider 2 312 can be moved again so that the slider 2 312 blocks the air outlet pipe 26 but does not block the air inlet pipe 28, thereby generating negative pressure inside the telescopic rod 1 311, and the telescopic end of the telescopic rod 1 311 retracts, driving the catheter bracket 31 to rotate, reset and fix. When the storage space below the storage cover 41 needs to be used, the slider three 44 is moved so that the slider three 44 blocks the air outlet pipe two 26 but does not block the air inlet pipe two 28, so that negative pressure is generated in the telescopic rod two 43, and the telescopic end of the telescopic rod two 43 contracts to drive the slide groove two 42 to rotate and then drive the storage cover 41 to rotate, so that the spare medical cotton pad 34 or the medicine to be taken can be put into the storage space, and the slider three 44 is moved again so that the slider three 44 blocks the air inlet pipe two 28 but does not block the air outlet pipe two 26, and the air flows into the telescopic rod two 43 from the air outlet pipe two 26, and the telescopic end of the telescopic rod two 43 extends to drive the slide groove two 42 to rotate and then drive the storage cover 41 to be reset and fixed.

[0030] In short, if ordinary technicians in this field are inspired by it and design structural methods and embodiments similar to the technical solution without creatively designing without departing from the purpose of the invention, they should all fall within the scope of protection of the invention.

Claims

1. A mini midline catheter holder, comprising a cylindrical housing (1), characterized in that: It also comprises a massage fixing component (2) arranged on the cylindrical housing (1), a catheter fixing component (3) arranged on one side of the massage fixing component (2), and a storage component (4) arranged on one side of the catheter fixing component (3), wherein the massage fixing component (2) and the storage component (4) are connected by a pipeline; The massage fixing assembly (2) comprises an inflatable fixing unit arranged on the surface of the cylindrical shell (1) and an air outlet reversing unit arranged inside the inflatable fixing unit, the inflatable fixing unit and the air outlet reversing unit being in transmission connection, the inflatable fixing unit comprising an air pump (21) fixedly arranged on the surface of the cylindrical shell (1), an air outlet pipe (22) fixedly arranged at the air outlet end of the air pump (21), and an air inlet pipe (27) fixedly arranged at the air inlet end of the air pump (21); The catheter fixing assembly (3) comprises a needle protection unit rotatably arranged on the surface of the cylindrical shell (1) and a fixed catheter unit arranged on the surface of the cylindrical shell (1), the needle protection unit being connected to the air outlet pipe 1 (22) and the fixed catheter unit being connected to the air outlet pipe 1 (22).

2. A mini midline catheter fixator according to claim 1, characterized in that: The surface of the air outlet pipe (22) is fixedly provided with an air inflating pipe (23) through-through, the inner wall of the cylindrical shell (1) is fixedly provided with an air bag (213), the air inflating pipe (23) is connected to the interior of the air bag (213), the air outlet pipe (22) is fixedly provided with an air inflating pipe (24) through-through, the inner wall of the cylindrical shell (1) is fixedly provided with an air bag (214), the air inflating pipe (24) is connected to the interior of the air bag (214), the air bags (213) and the air bags (214) are arranged alternately, the surface of the air inlet pipe (27) is fixedly provided with an air inlet pipe (28), and the surface of the air outlet pipe (22) is fixedly provided with an air outlet pipe (26).

3. A mini midline catheter fixator according to claim 2, characterized in that: The air outlet reversing unit comprises a wheel cover (29) fixedly arranged on the inner wall of the air outlet pipe (22), an impeller (210) rotatably arranged inside the wheel cover (29), a ventilation disk (211) coaxially fixedly arranged on the side wall of the impeller (210), and a partition plate (212) fixedly arranged on the inner wall of the air outlet pipe (22).

4. A mini midline catheter fixator according to claim 3, characterized in that: An air intake short pipe (25) is fixedly provided on the outer wall of the wheel cover (29), and an air outlet pipe three (215) is fixedly provided on the outer wall of the wheel cover (29). One end of the air outlet pipe three (215) is connected to the interior of the wheel cover (29), and the other end of the air outlet pipe three (215) passes through the air outlet pipe one (22).

5. A mini midline catheter holder according to claim 4, wherein the needle protection unit comprises a needle cover (32) rotatably arranged on the surface of a cylindrical shell (1), an air bag three (33) fixedly arranged on the bottom wall of the needle cover (32), an air bag four (35) fixedly arranged on the bottom wall of the needle cover (32) and a medical cotton pad (34) detachably arranged on the surface of the air bag three (33), an air hole one (36) is penetrated inside the needle cover (32), the other end of the inflation tube one (23) penetrates the cylindrical shell (1) and corresponds to the air hole one (36), the air hole one (36) is connected with the inside of the air bag three (33), an air hole two (37) is penetrated inside the needle cover (32), the other end of the inflation tube two (24) penetrates the cylindrical shell (1) and corresponds to the air hole two (37), the air hole two (37) is connected with the inside of the air bag four (35).

6. A mini midline catheter fixator according to claim 5, characterized in that: The fixed conduit unit comprises a conduit support (31) rotatably mounted on the surface of a cylindrical shell (1), a slide groove (310) fixedly mounted on one side of the conduit support (31), a telescopic rod (311) fixedly mounted on the cylindrical shell (1), and a slider (312) slidably mounted on the surface of the cylindrical shell (1), wherein the telescopic end of the telescopic rod (311) is slidably and rotatably mounted in the slide groove (310), the interior of the telescopic rod (311) is connected to the interiors of the second air outlet pipe (26) and the second air inlet pipe (28), and the slider (312) corresponds to the second air outlet pipe (26) and the second air inlet pipe (28).

7. A mini midline catheter fixator according to claim 6, characterized in that: The storage assembly (4) comprises a storage cover (41) rotatably mounted on the surface of the cylindrical shell (1), a second slide groove (42) fixedly mounted on one side of the storage cover (41), a second telescopic rod (43) fixedly mounted on the cylindrical shell (1), and a third slider (44) slidably mounted on the surface of the cylindrical shell (1), wherein the telescopic end of the second telescopic rod (43) is slidably and rotatably mounted in the second slide groove (42), the interior of the second telescopic rod (43) is connected to the interior of the second air outlet pipe (26) and the second air inlet pipe (28), and the third slider (44) corresponds to the second air outlet pipe (26) and the second air inlet pipe (28).

8. The mini midline catheter fixator according to claim 7, characterized in that: The needle cover (32) is provided with sliders (38) which slide in opposite directions, and a spring (39) is fixed between the two sliders (38).

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