A midline catheter placement device

Abstract

The application relates to the technical field of medical devices, in particular to a midline catheter placing device, which comprises a needle tube assembly, the needle tube assembly comprises a supporting tube, a puncture needle is rotationally connected in the inside of the supporting tube, a puncture seat is screw-coupled to one end of the supporting tube, the puncture seat comprises two semicylinder blocks capable of being combined into a cylinder block, a clamping block is slidably connected in the inside of the semicylinder block, a midline catheter is sleeved outside the puncture needle, the midline catheter comprises a joint pipe slidably connected with the supporting tube, and a catheter body is fixedly connected in communication on the joint pipe. In the application, the traction assembly is installed and fixed on an ultrasonic probe, the hand holding the ultrasonic probe can use the thumb to drive the winding wheel on the traction assembly to rotate and wind the traction rope II while operating the ultrasonic probe, so that the traction rope I pulls the midline catheter, the convenience of the midline catheter placing is improved, and the efficiency of the midline catheter placing is also improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of medical devices, in particular to a midline catheter placement device. BACKGROUND

[0002] The midline catheter is a medium-length catheter placed through the peripheral vein, and the commonly used one is the mini midline catheter, which is mainly suitable for patients with a predicted intravenous infusion treatment cycle of 1-4 weeks, and is an infusion tool between the peripheral indwelling needle and the PICC. During the placement of the mini midline catheter, the medical staff usually holds the midline catheter placement device with the right hand and holds the ultrasonic probe with the left hand, screens the thickest, straightest and safest vein segment by using the ultrasonic probe, and then places the mini midline catheter into the vein by using the midline catheter placement device.

[0003] The existing mini midline catheter placement device mainly comprises a puncture needle, the puncture needle is integrated with a midline catheter on the outside, a tearable seat is installed on the puncture end of the puncture needle, a pusher is installed on one end of the catheter, the puncture needle and the catheter are clamped by the tearable seat to perform puncture, the catheter is pushed into the vein along the puncture needle by the pusher, and finally the puncture needle, the tearable seat and other structures are disassembled and removed to leave the catheter alone on the peripheral vein of the patient.

[0004] During the specific placement of the midline catheter, the left hand needs to hold the ultrasonic probe to screen the vein, then the right hand uses the tearable seat to insert the puncture needle with the catheter into the screened vein, and then one hand holds the tearable seat and the other hand pushes the pusher to push the catheter, at this time the user cannot free the hand to use the ultrasonic probe to track the catheter advancement, and if the catheter is blindly pushed, it is easy to top the vein bifurcation or the valve and then fold back, and the puncture needle, the tearable seat and other accessories on the conventional catheter placement device need to be disassembled from the catheter in sequence, which cannot quickly disassemble multiple accessories after the operation is completed, thereby affecting the placement efficiency of the midline catheter. SUMMARY

[0005] The purpose of the present application is to provide a midline catheter placement device to solve the problems raised in the background.

[0006] To achieve the above purpose, the present application provides the following technical scheme.

[0007] A midline catheter placement device comprises:

[0008] A needle tube assembly comprises a support tube, and a puncture needle is rotatably installed inside the support tube.

[0009] A puncture seat comprises two semicylindrical blocks that are screw-mounted with the support tube, a circular hole one is formed in the middle of the two semicylindrical blocks for the puncture needle to pass through, a clamping block is slidably connected inside the semicylindrical block, and a plurality of traction springs are fixed between the two sides of the clamping block and the semicylindrical block.

[0010] The utility model provides a middle line catheter, including the joint pipe of sliding connection with the support pipe, the joint pipe is fixed with the catheter body on the intercommunication, the joint pipe is fixed with the traction rope one, a plurality of rubber ball that can push the clamping block moves is fixed on the traction rope one,

[0011] The utility model discloses an ultrasonic probe can screen the venous catheterization,

[0012] The utility model discloses a traction assembly, including the shell of fixed with the ultrasonic probe, the inside rotation is connected with the winding wheel of shell, the winding wheel is fixed with the traction rope two of can draw the traction rope one on winding.

[0013] Further in, the outside of joint pipe is fixed with two sliding block no.

[0014] Further in, the catheter body is integratedly installed on the outside of puncture needle, and the puncture needle passes through the round hole no.

[0015] Further in, one end of puncture needle is fixed with the rotation post, and one end of support pipe is fixed with the mounting ring of rotation connection with rotation post.

[0016] Further in, the middle part of winding wheel is inserted and fixed with the connecting shaft of rotation connection with shell, and the both ends of connecting shaft are fixed with the dial wheel and ratchet respectively.

[0017] Further in, the bottom of pin shaft is fixed with the clamping block of active joint with ratchet, and one end of traction rope two is fixed with the spiral ring of detachable installation with traction rope one.

[0018] Further in, the inside of semicylindrical block is provided with the rectangular cavity of can accommodate clamping block, and the inside of semicylindrical block is provided with the sliding slot near the both sides of rectangular cavity, and traction spring is arranged in the sliding slot.

[0019] Further in, the both sides of clamping block are fixed with the sliding block no.

[0020] Further in, the bottom of clamping block is provided arc, and the both ends of clamping block are provided inclined plane, and the inside of semicylindrical block is provided with the round hole no.

[0021] Further in, one end of semicylindrical block is fixed with semicircular pipe, and the protective cap is installed between two semicircular pipes, and the outside of semicylindrical block is fixed with handheld part.

[0022] Compared with the prior art, the utility model has the beneficial effects that:

[0023] 1. The utility model discloses a middle line catheter placing device, which comprises a joint pipe of a middle line catheter, a traction rope I fixed on the joint pipe, a plurality of rubber balls fixed on one end of the traction rope I, a traction assembly fixed on an ultrasonic probe, a traction rope II on the traction assembly connected with the traction rope I, and a puncture seat arranged between the joint pipe and the traction assembly.

[0024] The plurality of rubber balls can abut against the puncture seat arranged between the semi-cylindrical block and the clamping block in the initial state, so that the two clamping blocks can maximally clamp the middle line catheter body and the puncture needle, and the puncture needle and the middle line catheter are fixed as a whole.

[0025] The user can hold the ultrasonic probe with one hand and stabilize the position of the puncture seat with the other hand, then rotate the winding wheel with the thumb of the hand holding the ultrasonic probe to wind the traction rope II, and the wound traction rope II pulls the traction rope I outward to make the plurality of rubber balls move out of the puncture seat, so that the clamping block releases the middle line catheter body, and the middle line catheter is conveniently pushed along the puncture needle.

[0026] The traction rope I continuously moves outward to pull the joint pipe outward, so that the joint pipe slides along the support pipe to push the middle line catheter body along the puncture needle into the vein, thereby realizing that one hand can operate the traction assembly to remotely place the catheter and use the ultrasonic probe to track the pushing process of the catheter, effectively solving the problem that two hands cannot simultaneously operate the ultrasonic probe, push the catheter and stabilize the puncture seat (tear seat), and improving the convenience and efficiency of the middle line catheter placing operation.

[0027] 3. By designing the traditional tearable seat in the form of two half-cylinder blocks, the two half-cylinder blocks can be combined into a cylindrical block-shaped puncture seat, and then are screwed with one end of the support pipe, so as to realize the combined installation of the puncture needle and the catheter body by combining and fixing the support pipe and the puncture seat, and after the operation, the support pipe can be detached from the catheter body with the puncture needle during the process of unscrewing and detaching the support pipe from the puncture seat, and the puncture seat losing the restraint of the support pipe can be separated into two half-cylinder blocks and directly detached from the catheter body, which facilitates the quick disassembly of the puncture seat, the support pipe, the puncture needle and related auxiliary parts. BRIEF DESCRIPTION OF DRAWINGS

[0028] Figure 1 is a schematic diagram of the overall structure of the present application;

[0029] Figure 2 is a schematic diagram of the state structure of the push catheter body in the present application;

[0030] Figure 3 is a schematic diagram of the overall structure of the support pipe, the cap and the traction assembly in the present application;

[0031] Figure 4 is a schematic diagram of the traction assembly structure in the present application;

[0032] Figure 5 is a schematic diagram of the internal structure of the support pipe in the present application;

[0033] Figure 6 is a schematic diagram of the overall structure of the midline catheter in the present application;

[0034] Figure 7 is a schematic diagram of the puncture seat structure in the present application;

[0035] Figure 8 is a schematic diagram of the internal structure of the local half-cylinder block in the present application;

[0036] Figure 9 is a schematic diagram of the local half-cylinder block and the clamping block in the split state structure in the present application.

[0037] In the figure: 100, needle tube assembly; 110, support tube; 111, mounting ring; 120, puncture needle; 200, puncture seat; 210, semi-cylindrical block; 211, round hole one; 212, rectangular cavity; 213, round hole two; 214, sliding slot; 220, clamping block; 221, inclined surface; 222, sliding block one; 223, baffle; 230, traction spring; 240, semi-circular tube; 241, cap; 250, hand-held part; 300, midline catheter; 310, joint tube; 311, sliding block two; 320, catheter body; 330, traction rope one; 331, rubber ball; 400, ultrasonic probe; 500, traction assembly; 510, housing; 520, connecting shaft; 530, winding wheel; 531, push wheel; 532, ratchet wheel; 540, traction rope two; 541, spiral ring; 550, pin shaft; 551, clamping block. DETAILED DESCRIPTION

[0038] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all the other embodiments obtained by those of ordinary skill in the art without creative work fall within the protection scope of the present application.

[0039] Embodiment one, please refer to Figure 1 - Figure 9The embodiment of the application discloses a midline catheter placing device which comprises a needle tube assembly 100, the needle tube assembly 100 comprises a supporting tube 110, a puncture needle 120 is rotatably connected to the inside of the supporting tube 110, a puncture seat 200 is screw-coupled to one end of the supporting tube 110, the puncture seat 200 comprises two half-cylinder blocks 210 which can be combined into a cylinder block, a circular hole 211 for the puncture needle 120 to pass through is formed in the middle of the two half-cylinder blocks 210, a clamping block 220 is slidably connected to the inside of the half-cylinder block 210, a plurality of traction springs 230 are fixed between the two sides of the clamping block 220 and the half-cylinder block 210, a midline catheter 300 is sleeved outside the puncture needle 120, the midline catheter 300 comprises a joint tube 310 which is slidably connected to the supporting tube 110, a catheter body 320 is fixedly connected to the joint tube 310, a traction rope 330 is fixed to the joint tube 310, a plurality of rubber balls 331 which can push the clamping block 220 to move are fixed to the traction rope 330, and the clamping block 220 can clamp and fix the catheter body 320 outside the puncture needle 120, wherein the placing device further comprises an ultrasonic probe 400 which can screen a catheter vein, a traction assembly 500 which can drive the catheter body 320 to move is arranged outside the ultrasonic probe 400, the traction assembly 500 comprises a shell 510 which is fixed to the ultrasonic probe 400, a winding wheel 530 is rotatably connected to the inside of the shell 510, and a traction rope 540 which can pull the traction rope 330 is fixedly wound on the winding wheel 530.

[0040] Specifically, by designing the traditional hand tearing seat into a puncture seat 200 style combined with two half-cylinder blocks 210, the half-cylinder block 210 is slidably connected with a clamping block 220 inside, the joint pipe 310 of the midline catheter 300 is connected with a traction rope I 330 through the puncture seat 200, in the early stage, the rubber ball 331 on the traction rope I 330 can clamp and fix the catheter body 320 and the puncture needle 120 through the clamping block 220, which facilitates the puncture needle 120 to stab into the vein with the catheter body 320, in the middle stage, pulling the traction rope I 330 outward makes the rubber ball 331 disengage from the clamping block 220, so that the clamping block 220 releases the catheter body 320, which facilitates the catheter body 320 to slide along the puncture needle 120 and be placed into the vein, in the later stage, the traction assembly 500 continues to pull the midline catheter 300 outward by traction of the traction rope I 330, which facilitates the midline catheter 300 to remotely enter the vein, and the traction assembly 500 is installed and fixed on the ultrasonic probe 400, so that the hand holding the ultrasonic probe 400 can use the thumb to operate the winding wheel 530 on the traction assembly 500 to rotate and wind the traction rope II 540, so that the traction rope I 330 pulls the midline catheter 300, so that the ultrasonic probe 400 tracks the midline catheter 300 during the placement of the midline catheter 300, the midline catheter 300 automatically enters the vein, and the multi-directional catheter placement action of holding the puncture seat 200 firmly is simultaneously performed, which not only improves the convenience of placing the midline catheter 300 but also improves the efficiency of placing the midline catheter 300.

[0041] As shown in Figure 5 In this embodiment, one end of the puncture needle 120 is fixed with a rotating column, one end of the support pipe 110 is fixed with a mounting ring 111 rotationally connected with the rotating column, and one end of the puncture seat 200 is provided with a thread for screwing connection with the support pipe 110. When the support pipe 110 is unscrewed and removed from the puncture seat 200 after the operation is completed, since the end of the puncture needle 120 is rotationally connected with the support pipe 110, the puncture needle 120 does not rotate synchronously with the support pipe 110 during the rotation of the support pipe 110, thereby preventing the patient from being uncomfortable due to the rotation of the puncture needle 120 in the vein along with the support pipe 110.

[0042] As shown in Figure 8 and Figure 9 In this embodiment, the half-cylinder block 210 is internally provided with a rectangular cavity 212, and the half-cylinder block 210 is internally provided with a sliding groove 214 near both sides of the rectangular cavity 212. The clamping block 220 slides up and down inside the rectangular cavity 212, both sides of the clamping block 220 are fixed with a sliding block I 222 slidably connected with the sliding groove 214, the bottom end of the traction spring 230 is fixedly connected with the sliding block I 222, the top end of the traction spring 230 is fixedly connected with the inner top of the rectangular cavity 212, and the top of the sliding block 221 is fixed with a baffle 223.

[0043] In the embodiment, when the traction rope one 330 takes the rubber ball 331 away from the puncture seat 200, the slider one 222 takes the clamping block 220 to the maximum under the traction of the traction spring 230, that is, the top of the baffle 223 abuts against the inner top of the rectangular cavity 212, at this time, the bottom of the clamping block 220 is separated from the round hole one 211, at this time, the two opposite clamping blocks 220 do not clamp the catheter body 320.

[0044] As shown in Figure 8 and Figure 9 In the embodiment, the arc surface of the bottom of the clamping block 220 is sleeved with a rubber sleeve, so that the bottom surface of the clamping block 220 can firmly clamp the catheter body 320 and the outer curved surface of the puncture needle 120, the inner part of the semi-cylindrical block 210 is provided with a round hole two 213 for the movement of the traction rope one 330 with the rubber ball 331, the two ends of the clamping block 220 are provided with inclined surfaces 221, which facilitate the smooth movement of the traction rope one 330 with the rubber ball 331 to the position between the clamping block 220 and the rectangular cavity 212, the baffle 223 can block the outside of the sliding groove 214 to prevent the rubber ball 331 from entering the sliding groove 214, which helps the rubber ball 331 to slide only in the position on the top of the clamping block 220 inside the rectangular cavity 212.

[0045] In the embodiment, when the clamping block 220 clamps and fixes the catheter body 320 outside the puncture needle 120 during the preparation of the puncture seat 200, the rubber ball 331 on the traction rope one 330 is pulled to the inside of the round hole two 213, the rubber ball 331 can enter the space position above the clamping block 220 inside the rectangular cavity 212 along the inclined surface at the end of the clamping block 220, the inclined surface 221 on the clamping block 220 facilitates the smooth entry of the rubber ball 331 into the position inside the puncture seat 200 for limiting the catheter body 320, wherein the part of the traction rope one 330 exposed from the puncture seat 200 and the part arranged inside the support pipe 110 are in a relaxed state in the initial state, the traction rope one 330 in the relaxed state facilitates the user to manually pull the traction rope one 330 to make the rubber ball 331 enter and exit the puncture seat 200, the rubber ball 331 enters the puncture seat 200 to realize the combined fixing of the catheter body 320 and the puncture needle 120, the rubber ball 331 moves out of the puncture seat 200 to make the catheter body 320 not in extrusion contact with the puncture needle 120, and the position of the catheter body 320 on the puncture needle 120 can be artificially adjusted in advance.

[0046] In the embodiment, refer to Figure 5, the relaxed part of the area inside the supporting tube 110 can meet the requirement that the plurality of rubber balls 331 on the traction rope one 330 cannot be pulled by the traction rope one 330 to move the catheter body 320 during the process of leaving the puncture seat 200, only after the plurality of rubber balls 331 all leave the puncture seat 200, the relaxed traction rope one 330 in the area is straightened, and then the traction rope one 330 is continuously pulled to make the catheter body 320 slide along the puncture needle 120, so that the catheter body 320 is first separated from the puncture needle 120, and then the catheter body 320 is individually pulled to move the catheterization.

[0047] As shown in Figure 3 and Figure 7 , in this embodiment, one end of the semi-cylindrical block 210 is fixed with a semi-circular pipe 240, and the two semi-circular pipes 240 are combined into a circular pipe after the two semi-cylindrical blocks 210 are combined, the circular pipe plays a role of guiding and conveying the catheter body 320, a cap 241 is installed between the two semi-circular pipes 240, in the initial state, the cap 241 is sleeved on the outside of the puncture needle 120 and the catheter body 320, which realizes the protection of the catheter body 320 and the puncture needle 120, the outside of the semi-cylindrical block 210 is fixed with a hand-held part 250, which facilitates the user to hold the puncture seat 200 to position the puncture needle 120 to be inserted into the vein.

[0048] As shown in Figure 3 and Figure 5 , in this embodiment, the outside of the joint pipe 310 is fixed with two sliding blocks two 311 which are in sliding connection with the supporting tube 110, and the supporting tube 110 is provided with a hole slot on both sides for the sliding block two 311 to slide, so that the joint pipe 310 of the midline catheter 300 can stably slide along the supporting tube 110, and the movement of the catheter body 320 is not limited to being pulled by the traction rope one 330, but also can realize the traditional catheterization operation, specifically, the user pushes the sliding block two 311 to make the joint pipe 310 with the catheter body 320 slide on the puncture needle 120 for catheterization, and the specific catheterization method can be flexibly selected.

[0049] As shown in Figure 5 , in this embodiment, the catheter body 320 is integrated and installed on the outside of the puncture needle 120, and the puncture needle 120 passes through the circular hole one 211 with the catheter body 320, so that the puncture needle 120 can enter the vein with the catheter body 320, and the specific position relationship between the catheter body 320 and the puncture needle 120 is the same as that of the existing catheter body 320 sleeved on the outside of the puncture needle 120, which facilitates the relative sliding of the puncture needle 120 and the catheter body 320.

[0050] As shown in Figure 4As shown, in this embodiment, a connecting shaft 520 that is rotatably connected to the housing 510 is inserted and fixed in the middle of the winding wheel 530. A push wheel 531 and a ratchet 532 are fixed at both ends of the connecting shaft 520, respectively. A pin 550 is slidably connected to the housing 510. A locking block 551 that is movably engaged with the ratchet 532 is fixed at the bottom of the pin 550. A compression spring is fixed between the locking block 551 and the housing 510. A spiral ring 541 that is detachably installed with the first traction rope 330 is fixed at one end of the second traction rope 540.

[0051] In this embodiment, the user uses their thumb to turn the actuation wheel 531 counterclockwise while holding the ultrasonic probe 400. The actuation wheel 531 rotates the winding wheel 530 to wind up the second traction rope 540. At this time, the ratchet 532 on the winding wheel 530 abuts against the locking block 551 to prevent the winding wheel 530 from automatically rotating in the opposite direction to release the second traction rope 540. As the second traction rope 540 is continuously wound up, the first traction rope 330 gradually pulls the midline catheter 300 outward, allowing the midline catheter 300 to enter the vein along the puncture needle 120. The spiral ring 541 is similar to a key ring in the prior art, which allows the first traction rope 330 to be easily detachably sleeved and installed on the spiral ring 541. Then, the second traction rope 540 pulls the first traction rope 330 with the help of the spiral ring 541.

[0052] like Figure 1 As shown, in this embodiment, in the initial state, the locking block 551 can be disengaged from the ratchet 532 by pulling the pin 550 upward with the collar, and then the winding wheel 530 can be rotated in the opposite direction, thereby releasing the second traction rope 540 from the winding wheel 530 to a sufficient length so that the second traction rope 540 is in a slack state. This allows the length of the second traction rope 540 to meet the requirements of the ultrasound probe 400 for multiple positional vein screening. Once a suitable vein is found, the ultrasound probe 400 can be slightly tilted, and then the puncture needle 120 can be inserted into the vein at an angle of 15-20 degrees. After the puncture needle 120, along with the end of the catheter body 320, enters the vein, the puncture needle 120 is gradually lowered until... Figure 2 This condition facilitates the subsequent insertion of the catheter body 320 into the vein. Figure 2 In the remote catheter placement state, traction rope 2 540 is tensioned to a taut state, and then the winding wheel 530 continues to rotate to wind traction rope 2 540, so that traction rope 1 330 pulls the midline catheter 300 into the vein.

[0053] In the present application, when the catheter body 320 is placed in the vein, the support tube 110 can be unscrewed from the puncture seat 200, and the support tube 110 pulls out the catheter body 320 with the puncture needle 120, separates the two half-cylinder blocks 210, exposes the joint tube 310 outside the skin, and then uses surgical forceps to cut the traction rope I 330, which can be tied to the arm to achieve the initial stability of the joint tube 310. Finally, the external fixation sticker is removed to fix the joint tube 310, and the infusion tube is connected to the joint tube 310. Among them, the ultrasonic probe 400 and the entire traction assembly 500 can be repeatedly used, and next time, only the spiral ring 541 on the traction rope II 540 is installed on the traction rope I 330 of the new midline catheter 300 in advance, and then the midline catheter 300 is pulled out for placement.

[0054] It will be obvious to a person skilled in the art that, without departing from the spirit or essential characteristics of the application, the present application can be implemented in other specific forms. The present examples are therefore to be considered in all respects as illustrative and not restrictive, the scope of the application being indicated by the appended claims rather than by the description given above, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference signs in the claims should not be construed as limiting the scope of the claims.

[0055] In addition, it should be understood that although the present specification is described in terms of embodiments, not every embodiment contains only one independent technical solution, and the description of the specification is only for the sake of clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that those skilled in the art can understand.

Claims

1. A device for placing a midline conduit, characterized in that, include: The needle assembly (100) includes a support tube (110) and a puncture needle (120) is rotatably mounted inside the support tube (110). The puncture seat (200) includes two semi-cylindrical blocks (210) that are screwed onto the support tube (110). A circular hole (211) for the puncture needle (120) to pass through is opened in the middle of the two semi-cylindrical blocks (210). A clamping block (220) is slidably connected inside the semi-cylindrical block (210). Multiple traction springs (230) are fixed between the clamping block (220) and the semi-cylindrical block (210) on both sides. The midline conduit (300) includes a connector tube (310) that is slidably connected to the support tube (110). The connector tube (310) is connected to and fixedly connected to the conduit body (320). A traction rope (330) is fixedly connected to the connector tube (310). A plurality of rubber balls (331) that can push the clamping block (220) to move are fixedly connected to the traction rope (330). An ultrasound probe (400) can screen for catheterized veins; The traction assembly (500) includes a housing (510) fixed to an ultrasonic probe (400), and a winding wheel (530) is rotatably connected inside the housing (510). A second traction rope (540) capable of traction rope one (330) is wound and fixed on the winding wheel (530). The semi-cylindrical block (210) has a rectangular cavity (212) inside that can accommodate the clamping block (220). The semi-cylindrical block (210) has a sliding groove (214) on both sides near the rectangular cavity (212). The traction spring (230) is arranged inside the sliding groove (214). Both sides of the clamping block (220) are fixed with sliders (222) that are slidably connected to the slide groove (214). The traction spring (230) is fixed between slider (222) and slide groove (214). A baffle (223) is fixed on the top of slider (221). The bottom of the clamping block (220) is set in an arc shape, and the two ends of the clamping block (220) are set in an inclined surface. The interior of the semi-cylindrical block (210) is provided with a circular hole (213) for the traction rope (540) to move with the rubber ball (331).

2. The midline conduit placement device according to claim 1, characterized in that, Two sliders (311) are fixed on the outside of the connector tube (310), both of which are slidably connected to the support tube (110). The traction rope (330) inside the support tube (110) is in a slack state.

3. The midline conduit placement device according to claim 1, characterized in that, The catheter body (320) is integrated and installed on the outside of the puncture needle (120), and the puncture needle (120) carries the catheter body (320) through the round hole (211).

4. The midline conduit placement device according to claim 1, characterized in that, One end of the puncture needle (120) is fixed with a rotating column, and one end of the support tube (110) is fixed with an installation ring (111) that is rotatably connected to the rotating column.

5. The midline conduit placement device according to claim 1, characterized in that, The winding wheel (530) is fixedly inserted in the middle with a connecting shaft (520) that is rotatably connected to the housing (510). The two ends of the connecting shaft (520) are respectively fixed with a push wheel (531) and a ratchet (532).

6. The midline conduit placement device according to claim 5, characterized in that, A pin (550) is slidably connected to the housing (510). A locking block (551) is fixed at the bottom of the pin (550) and is movably engaged with the ratchet (532). One end of the second traction rope (540) is fixed with a spiral ring (541) that is detachably installed with the first traction rope (330).

7. The midline conduit placement device according to claim 6, characterized in that, One end of the semi-cylindrical block (210) is fixed with a semi-circular tube (240), a protective cap (241) is installed between the two semi-circular tubes (240), and a hand-held part (250) is fixed on the outside of the semi-cylindrical block (210).

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