Subcutaneous tunnel establishing device in tunnel type PICC (Peripherally Inserted Central Catheter) cathetering

Abstract

The invention discloses a subcutaneous tunnel establishing device in tunnel type PICC catheterization, and particularly relates to the technical field of subcutaneous tunnel establishing instruments.The subcutaneous tunnel establishing device comprises a puncture needle used for puncturing subcutaneous tissue, a drawing needle is inserted into the puncture needle, and a puncture needle driving part is detachably connected into the drawing needle; a PICC catheter fixing assembly is detachably connected into the drawing needle, when the PICC catheter is drawn, the tail end of the PICC catheter is inserted into the drawing needle and arranged at the tail end of the PICC catheter fixing assembly in a sleeving mode, then air is inflated into the PICC catheter fixing assembly to extrude the tail end of the PICC catheter between the tail end of the PICC catheter fixing assembly and the inner wall of the drawing needle, and fixing of the tail end of the PICC catheter is achieved. According to the drawing needle, the tail end of the PICC can be extruded and fixed in the drawing needle by utilizing the inflated and expanded air bag in the process of drawing the PICC to penetrate through subcutaneous tissue, so that the problem that the PICC falls off from the interior of the drawing needle in the moving process can be solved, and smooth establishment of a subcutaneous tunnel during PICC catheterization is ensured.

Description

Technical Field

[0001] The present invention relates to the technical field of subcutaneous tunnel establishment instruments, and more particularly to a subcutaneous tunnel establishment device during tunnel-type PICC catheterization. Background Art

[0002] PICC is a medium- to long-term venous access technique that involves inserting a catheter through a peripheral vein in the upper limb (such as the basilic, cephalic, or brachial vein) with its tip reaching the junction of the superior vena cava (SVC) and the right atrium (CAJ). It is suitable for patients requiring continuous intravenous therapy (greater than 7 days), such as chemotherapy, parenteral nutrition, and long-term antibiotic therapy. PICC is a safe and effective medium- to long-term venous access technique. Ultrasound guidance can improve the success rate of catheterization, and standardized maintenance can reduce complications.

[0003] Tunneled PICCs are a new technology for inserting a peripherally inserted central venous catheter (PICC). Unlike conventional PICCs, tunneled PICCs create a subcutaneous tunnel, allowing for a certain distance between the vascular puncture site and the catheter outlet. This allows the catheter outlet to be positioned in a more suitable and advantageous location, avoiding areas prone to moisture, sweating, activity restrictions, and inconvenient catheter use and maintenance, as well as areas with damaged or scarred skin. This technology significantly reduces the risk of catheter infection and thrombosis, decreases the probability of catheter dislodgement, avoids discomfort during patient activity, and improves patient comfort.

[0004] Currently, two puncture methods are used clinically: the two-needle subcutaneous tunnel method (puncture needle + tunnel needle) and the one-needle subcutaneous tunnel method. The two-needle subcutaneous tunnel method requires two punctures, as shown in prior art publication number CN110960298B: First, the puncture needle is used to puncture the blood vessel, one end of the guide wire is inserted into the blood vessel, and then the tunnel needle is used to puncture and establish a subcutaneous tunnel. Finally, the guide wire is removed, a dilator is inserted, and the PICC catheter is inserted.

[0005] In order to prevent the PICC catheter from scratching the subcutaneous tissue during the process of passing through the subcutaneous tunnel, a hollow tunnel needle is used clinically to insert one end of the PICC catheter into the tunnel needle. However, due to the lack of fixation between the PICC catheter and the inside of the tunnel needle, the PICC catheter and the inner wall of the tunnel needle can slide relative to each other, which causes the end of the PICC catheter to easily detach from the tunnel needle during the process of passing through the subcutaneous tissue, thereby affecting the normal establishment of the subcutaneous tunnel. Summary of the Invention

[0006] In order to overcome the above-mentioned defects of the prior art, the present invention provides a subcutaneous tunnel establishment device during tunnel-type PICC catheterization surgery, which can use the inflated air bag to squeeze and fix the end of the PICC catheter inside the withdrawal needle during the process of pulling the PICC catheter through the subcutaneous tissue, thereby preventing the PICC catheter from falling off from the withdrawal needle during movement, ensuring the smooth establishment of the subcutaneous tunnel during PICC catheterization, and solving the problems arising from the above-mentioned background technology.

[0007] To achieve the above objectives, the present invention provides the following technical solutions: a subcutaneous tunnel establishment device during tunnel-type PICC catheterization, comprising a puncture needle for puncturing subcutaneous tissue, a withdrawal needle inserted into the interior of the puncture needle, and a puncture needle driving member detachably connected to the interior of the withdrawal needle. During puncture, air is uniformly supplied to the interior of the puncture needle driving member to propel the puncture needle to move uniformly along the outer wall of the withdrawal needle until one end of the puncture needle penetrates the subcutaneous tissue;

[0008] The PICC catheter fixing component is detachably connected to the inside of the withdrawal needle. When the PICC catheter is pulled out, the end of the PICC catheter is inserted into the withdrawal needle and sleeved on the end of the PICC catheter fixing component. Then, air is inflated into the PICC catheter fixing component to squeeze the end of the PICC catheter between the end of the PICC catheter fixing component and the inner wall of the withdrawal needle, thereby fixing the end of the PICC catheter.

[0009] In a preferred embodiment, the PICC catheter fixing assembly includes an inflation connector, one end of which is fixedly connected to a hollow fixing rod, and the end of the fixing rod is fixedly connected to an airbag. After the airbag is inflated, the end of the PICC catheter, which is sleeved on the outer end of the airbag, is squeezed into the inner wall of the withdrawal needle to fix the end of the PICC catheter.

[0010] In a preferred embodiment, the puncture needle drive component includes a hose inserted into the pulling needle, one end of the hose is connected to a pneumatic push head, the other end of the hose is connected to a threaded tube, the end of the threaded tube away from the hose is connected to an trachea connector, a sealing plug is provided on the side of the trachea connector close to the threaded tube, the end of the threaded tube away from the hose passes through the sealing plug and is fixed to the sealing plug, the trachea connector is connected to an inflation device for inflating the threaded tube and the inside of the hose, and the gas pushes the puncture needle to move subcutaneously through the pneumatic push head.

[0011] In a preferred embodiment, the pneumatic pushing head includes a hollow connecting shell, one end of the connecting shell is fixed to the hose, the interior of the connecting shell is connected to the interior of the hose, a plurality of through holes are provided on the outer wall of the pneumatic pushing head, a piston is fixed on the side of the connecting shell away from the hose, a spring is fixed on one side of the piston, and a push plate is fixed on the end of the spring away from the connecting shell. The gas inside the hose enters the interior of the connecting shell at a uniform speed, overflows through the through hole and pushes the piston to compress the spring, causing the spring to squeeze the push plate to push the puncture needle to move at a uniform speed under the skin.

[0012] In a preferred embodiment, the pulling needle includes a pulling needle rod, one end of the pulling needle rod is fixedly connected to the needle seat, and needle handles are fixed on both sides of the needle seat;

[0013] The inner wall of the opening at one end of the pulling needle rod away from the needle seat is processed with a tapered surface that matches the inclined surface of the outer wall of the piston, which is used to confine the piston inside the pulling needle rod;

[0014] The diameter of one end of the piston is consistent with the inner diameter of the drawing needle rod, and is used to seal the gas overflowing through the through hole on one side of the piston.

[0015] In a preferred embodiment, the sealing plug is threadedly connected to an opening at one end of the needle seat away from the withdrawal needle rod, and is used to block the gas overflowing from the through hole into the interior of the withdrawal needle rod.

[0016] In a preferred embodiment, the inflation joint is threadedly connected to the inside of the withdrawal needle rod, and is used to fix the fixing rod inside the withdrawal needle rod.

[0017] In a preferred embodiment, the puncture needle includes a puncture needle rod that is sleeved on the outside of the pulling needle rod, and a puncture needle head is fixed to one end of the puncture needle rod. When the puncture needle drive member is inserted into the pulling needle, the push plate contacts the inner wall of the puncture needle rod to push the puncture needle rod to move subcutaneously to achieve puncture.

[0018] Technical effects and advantages of the present invention:

[0019] 1. In view of the risk of the PICC catheter falling out of the tunnel needle during the process of passing through the subcutaneous tissue, the present invention specially provides a PICC catheter fixing assembly for use with the withdrawal needle, so that the inflated air bag can be used to squeeze and fix the end of the PICC catheter inside the withdrawal needle during the process of pulling the PICC catheter through the subcutaneous tissue, thereby preventing the PICC catheter from falling out of the withdrawal needle during movement, and further ensuring the smooth establishment of the subcutaneous tunnel during PICC placement.

[0020] 2. When establishing a subcutaneous tunnel, the present invention uses a combination of a pulling needle and a puncture needle to replace the traditional tunnel needle. By uniformly ventilating the inside of the puncture needle driving part to drive the puncture needle to move at a uniform speed under the skin, it avoids sudden force during the puncture process that may cause tissue tearing or damage to blood vessels and nerves, further ensuring the safe establishment of the subcutaneous tunnel. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a schematic diagram of the use of the withdrawal needle, puncture needle, and needle sheath drive assembly of the present invention;

[0022] Figure 2 It is a cross-sectional view of the withdrawal needle and the puncture needle of the present invention;

[0023] Figure 3 It is a structural schematic diagram of the pulling needle of the present invention;

[0024] Figure 4 It is a structural schematic diagram of the needle sheath drive assembly of the present invention;

[0025] Figure 5 This is a schematic structural diagram of the connection shell and the piston of the present invention;

[0026] Figure 6 It is a structural schematic diagram of the puncture needle of the present invention;

[0027] Figure 7 This is a schematic diagram of the withdrawal needle of the present invention used in conjunction with the PICC catheter fixing assembly;

[0028] Figure 8 A schematic diagram of the PICC catheter fixing assembly of the present invention inside the withdrawal needle;

[0029] Figure 9 A cross-sectional view of the withdrawal needle and PICC catheter fixing assembly of the present invention;

[0030] Figure 10 This is a schematic diagram of the PICC catheter fixing assembly of the present invention fixing the PICC catheter.

[0031] The accompanying drawings are:

[0032] 1. Withdrawal needle; 2. Puncture needle; 3. Puncture needle drive; 4. PICC catheter fixing assembly; 5. PICC catheter;

[0033] 11. Pull out the needle rod; 111. Tapered surface; 12. Needle seat; 13. Needle handle;

[0034] 21. Puncture needle shaft; 22. Puncture needle tip;

[0035] 31. Hose; 32. Pneumatic push head; 321. Connecting shell; 322. Through hole; 323. Piston; 324. Spring; 325. Push plate; 33. Threaded pipe; 34. Sealing plug; 35. Air pipe connector;

[0036] 41. Inflatable connector; 42. Fixing rod; 43. Airbag. DETAILED DESCRIPTION

[0037] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0038] Refer to the instruction manual Figure 1 、 Figure 3 and Figure 7 The present invention provides a subcutaneous tunnel establishment device for tunnel-type PICC catheterization, comprising a pulling needle 1 including a pulling needle rod 11, one end of the pulling needle rod 11 is fixedly connected to a needle seat 12, and needle handles 13 are fixed on both sides of the needle seat 12. The provided needle handles 13 can facilitate medical personnel to operate the pulling needle rod 11;

[0039] The present invention is carried out in two parts when used:

[0040] Part I: Puncture of the subcutaneous tissue

[0041] like Figure 1 As shown: A puncture needle 2 for puncturing subcutaneous tissue is installed outside the pulling needle 1, as shown in FIG. Figure 6 As shown, the puncture needle 2 includes a hollow puncture needle rod 21, one end of which is fixed with a puncture needle head 22. The end of the puncture needle head 22 away from the puncture needle rod 21 is processed into a pointed shape to facilitate puncturing subcutaneous tissue.

[0042] When establishing a subcutaneous tunnel, the puncture needle 22 must first be inserted into the subcutaneous tissue from the vascular puncture point, and then be removed from the tunnel needle puncture point. The subcutaneous area from the tunnel needle puncture point to the vascular puncture point is the "subcutaneous tunnel";

[0043] During the actual operation, the puncture needle rod 21 is first put on the outside of the pulling needle rod 11, and the end of the pulling needle rod 11 is ensured to be in contact with the inner wall of the puncture needle 22. Then, in order to ensure the uniform speed of the subcutaneous puncture process, a puncture needle drive member 3 is detachably connected to the inside of the pulling needle 1. Figure 2 、 Figure 4 and Figure 5As shown, the puncture needle drive member 3 includes a hose 31 inserted into the withdrawal needle 1, one end of the hose 31 is connected to a pneumatic driving head 32, the other end of the hose 31 is connected to a threaded tube 33, the end of the threaded tube 33 away from the hose 31 is connected to an trachea connector 35, the trachea connector 35 is provided with a sealing plug 34 on the side close to the threaded tube 33, the end of the threaded tube 33 away from the hose 31 passes through the sealing plug 34 and is fixed to the sealing plug 34, the trachea connector 35 is connected to the inflation device for uniformly inflating the threaded tube 33 and the hose 31. After inflation, the pneumatic driving head 32 moves with the hose 31 on the inner wall of the withdrawal needle rod 11, and the provided threaded tube 33 can be stretched by the hose 31;

[0044] In this embodiment, the pneumatic push head 32 includes a hollow connecting shell 321, one end of which is fixed to the hose 31, and the interior of the connecting shell 321 is connected to the interior of the hose 31. The outer wall of the pneumatic push head 32 is provided with a plurality of through holes 322, and the gas entering the interior of the connecting shell 321 can move to the interior of the drawing needle rod 11 through the through holes 322;

[0045] A piston 323 is also fixed to the side of the connecting shell 321 away from the hose 31. The connecting shell 321 is made of a lightweight, hard material and can be used to support the piston 323 so that the piston 323 can stand inside the withdrawal needle rod 11. The diameter of one end of the piston 323 is consistent with the inner diameter of the withdrawal needle rod 11, and is used to block the gas overflowing through the through hole 322 on one side of the piston 323. At the same time, a sealing plug 34 is threadedly connected to the opening of the end of the needle seat 12 away from the withdrawal needle rod 11, which can block the opening of the needle seat 12 to prevent the gas from leaking out.

[0046] A spring 324 is fixed to one side of the piston 323. A push plate 325 is fixed to the end of the spring 324 away from the connecting shell 321. The push plate 325 contacts the inner wall of the puncture needle rod 21 to push the puncture needle rod 21 to move subcutaneously to achieve puncture. The inner wall of the opening at the end of the withdrawal needle rod 11 away from the needle seat 12 is processed with a tapered surface 111 that matches the inclined surface of the outer wall of the piston 323, which is used to confine the piston 323 inside the withdrawal needle rod 11.

[0047] By connecting the air outlet pipe of the inflation device to the trachea connector 35, and then sending air to the inside of the threaded tube 33 and the hose 31 at a uniform speed, the gas then moves to the inside of the withdrawal needle rod 11 through the through hole 322. As the gas inside the withdrawal needle rod 11 continues to increase, the gas will push the through hole 322 to compress the spring 324. When the thrust applied by the spring 324 to the push plate 325 is greater than the resistance applied by the subcutaneous tissue to the puncture needle 22, the compressed spring 324 can push the puncture needle 22 to move, thereby puncturing the subcutaneous tissue. Moreover, since the gas entering the withdrawal needle rod 11 is at a uniform speed, the puncture of the puncture needle 22 can also be controlled to be performed at a uniform speed. Medical personnel can also accurately control the puncture speed by controlling the flow rate of the gas, thereby improving the accuracy of subcutaneous puncture.

[0048] Among them, the length of the spring 324 is much larger than the length of the subcutaneous tunnel. This setting can ensure that the distance driven by the gas pushing the piston 323 and squeezing the spring 324 is greater than the length of the subcutaneous tunnel, thereby ensuring that the puncture needle 22 can pass through the blood vessel puncture point.

[0049] The present invention can accurately and uniformly control the subcutaneous tunnel puncture speed, can avoid damage to subcutaneous tissue, blood vessels, and nerves, and has high safety.

[0050] It is worth noting that the length of the puncture needle shaft 21 and the length of the withdrawal needle shaft 11 in the present invention are both much longer than the length of the subcutaneous tunnel. This design is intended, on the one hand, to increase the contact area between the puncture needle shaft 21 and the medical staff, making it easier for them to operate, and on the other hand, to ensure that the puncture needle shaft 21 can penetrate the subcutaneous tunnel.

[0051] After the puncture needle 22 passes through the tunnel needle puncture point, the gas inside the pulling needle rod 11 can be discharged through the tracheal connector 35, so that the push plate 325 moves back into the pulling needle rod 11. Then the medical staff can synchronously move the pulling needle rod 11 and the puncture needle rod 21 until both the puncture needle rod 21 and the pulling needle rod 11 penetrate the skin tissue in the area where the subcutaneous tunnel is located. Then the puncture needle rod 21 can be pulled out from the outer wall of the pulling needle rod 11, and then the next part of the operation can be carried out.

[0052] Part 2: Pulling PICC catheter 5 through the subcutaneous tunnel

[0053] like Figure 7 As shown, a PICC catheter fixing assembly 4 is detachably connected to the interior of the withdrawal needle 1. Specifically, as shown in FIG. Figure 8 and Figure 9As shown: the PICC catheter fixing assembly 4 includes an inflation connector 41, one end of which is fixedly connected to a hollow fixing rod 42, and the end of the fixing rod 42 is fixedly connected to an air bag 43. When in use, it is necessary to first remove the puncture needle drive member 3 from the inside of the withdrawal needle 1, and then insert the fixing rod 42 into the withdrawal needle 1. Then, rotate the inflation connector 41 so that the inflation connector 41 is threadedly connected to the inside of the withdrawal needle rod 11, completing the installation of the PICC catheter fixing assembly 4 and the withdrawal needle 1;

[0054] Then, the end of the PICC catheter 5 is inserted into the withdrawal needle 1 so that it can be sheathed outside the airbag 43. Then, the inflation device is connected to the inflation connector 41, so that the inflation device can send air to the inflation connector 41 and the fixing rod 42. Then, the gas will enter the airbag 43. After the air is inflated, the airbag 43 will expand. The expanded airbag 43 will squeeze the PICC catheter 5 from the inside until the PICC catheter 5 is tightly squeezed between the inside of the withdrawal needle rod 11 and the airbag 43. Figure 10 As shown in , at this time, the end of the PICC catheter 5 can be fixed in the inner wall of the withdrawal needle 1 due to being squeezed, thereby achieving fixation between the PICC catheter 5 and the withdrawal needle rod 11;

[0055] Next, the inflation device is turned off, and the medical staff pinches the needle handle 13 to pull back the pulling needle rod 11. The pulling needle rod 11 moves while driving the PICC catheter 5 through the subcutaneous tissue until the end of the PICC catheter 5 passes through the blood vessel puncture point. During this process, the end of the PICC catheter 5 is hidden inside the pulling needle rod 11, so there will be no problem of the edge of the PICC catheter 5 damaging the subcutaneous tissue, blood vessels or nerves. At the same time, under the squeezing and fixation of the airbag 43, the connection between the end of the PICC catheter 5 and the pulling needle rod 11 can be reinforced, and the PICC catheter 5 will not be detached from the inside of the pulling needle rod 11, thereby ensuring the smooth establishment of the subcutaneous tunnel.

[0056] Finally, the guide wire inserted into the blood vessel is pulled out, and the end of the PICC catheter 5 is placed into the blood vessel using an expansion tube with a tear-off pin to complete the insertion of the PICC catheter. At this time, the connector of the PICC catheter 5 is exactly located at the tunnel puncture point, so that it is at a certain distance from the blood vessel puncture point.

[0057] The present invention provides four independent parts: the withdrawal needle 1, the puncture needle 2, the puncture needle drive 3, and the PICC catheter fixing assembly 4. Through their clever coordination, the problem of the PICC catheter 5 falling off during the subcutaneous tunnel establishment process is solved, and the puncture speed of the subcutaneous tunnel is accurately controlled, thereby enhancing the safety of the subcutaneous tunnel establishment.

[0058] The independent design also allows for easy cleaning and disinfection after each use, making it easy to reuse and highly economical. It also allows for easy replacement of damaged parts, reducing treatment costs.

[0059] In addition, the inflation device used in the present invention can be an instrument that can control the gas flow rate, such as an air pump, which will not be further described here.

[0060] Finally: The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A subcutaneous tunneling device for tunnel-type PICC catheterization, characterized by: The invention comprises a puncture needle (2) for puncturing subcutaneous tissue, wherein a pull-out needle (1) is inserted into the interior of the puncture needle (2), and a puncture needle driving member (3) is detachably connected to the interior of the pull-out needle (1). During puncture, air is uniformly supplied to the interior of the puncture needle driving member (3) to push the puncture needle (2) to move uniformly along the outer wall of the pull-out needle (1) until one end of the puncture needle (2) is inserted out from under the skin; The withdrawal needle (1) is detachably connected to a PICC catheter fixing assembly (4). When the PICC catheter (5) is withdrawn, the end of the PICC catheter (5) is inserted into the withdrawal needle (1) and sleeved on the end of the PICC catheter fixing assembly (4). Then, air is inflated into the PICC catheter fixing assembly (4) to squeeze the end of the PICC catheter (5) between the end of the PICC catheter fixing assembly (4) and the inner wall of the withdrawal needle (1), thereby fixing the end of the PICC catheter (5).

2. The subcutaneous tunnel establishment device for tunnel-type PICC catheterization according to claim 1, characterized in that: The PICC catheter fixing assembly (4) includes an inflation connector (41), one end of which is fixedly connected to a hollow fixing rod (42), and the end of the fixing rod (42) is fixedly connected to an air bag (43). After the air bag (43) is inflated, the end of the PICC catheter (5) sleeved on the outer end of the air bag (43) is squeezed into the inner wall of the withdrawal needle (1), thereby fixing the end of the PICC catheter (5).

3. The subcutaneous tunnel establishment device for tunnel-type PICC catheterization according to claim 2, characterized in that: The puncture needle drive member (3) includes a hose (31) inserted into the pulling needle (1), one end of the hose (31) is connected to a pneumatic driving head (32), the other end of the hose (31) is connected to a threaded tube (33), the end of the threaded tube (33) away from the hose (31) is connected to an air pipe joint (35), the side of the air pipe joint (35) close to the threaded tube (33) is provided with a sealing plug (34), the end of the threaded tube (33) away from the hose (31) passes through the sealing plug (34) and is fixed to the sealing plug (34), the air pipe joint (35) is connected to an inflation device for inflating the threaded tube (33) and the hose (31), and the gas pushes the puncture needle (2) to move subcutaneously through the pneumatic driving head (32).

4. The subcutaneous tunnel establishment device for tunnel-type PICC catheterization according to claim 3, characterized in that: The pneumatic push head (32) includes a hollow connecting shell (321), one end of the connecting shell (321) is fixed to the hose (31), the interior of the connecting shell (321) is communicated with the interior of the hose (31), a plurality of through holes (322) are provided on the outer wall of the pneumatic push head (32), a piston (323) is fixed on the side of the connecting shell (321) away from the hose (31), a spring (324) is fixed on one side of the piston (323), and a push plate (325) is fixed on the end of the spring (324) away from the connecting shell (321), the gas inside the hose (31) enters the connecting shell (321) at a uniform speed, overflows through the through hole (322) and pushes the piston (323) to compress the spring (324), so that the spring (324) squeezes the push plate (325) to push the puncture needle (2) to move uniformly under the skin.

5. The subcutaneous tunnel establishment device for tunnel-type PICC catheterization according to claim 4, characterized in that: The pulling needle (1) comprises a pulling needle rod (11), one end of the pulling needle rod (11) is fixedly connected to a needle seat (12), and needle handles (13) are fixed on both sides of the needle seat (12); The inner wall of the opening of the end of the pulling needle rod (11) away from the needle seat (12) is processed with a conical surface (111) that matches the inclined surface of the outer wall of the piston (323) and is used to restrict the piston (323) inside the pulling needle rod (11); The diameter of one end of the piston (323) is consistent with the inner diameter of the drawing needle rod (11), and is used to seal the gas overflowing through the through hole (322) on one side of the piston (323).

6. The subcutaneous tunnel establishment device for tunnel-type PICC catheterization according to claim 5, characterized in that: The sealing plug (34) is threadedly connected to an opening at one end of the needle seat (12) away from the withdrawal needle rod (11) and is used to seal the gas overflowing from the through hole (322) into the interior of the withdrawal needle rod (11).

7. The subcutaneous tunnel establishment device for tunnel-type PICC catheterization according to claim 5, characterized in that: The inflation joint (41) is threadedly connected to the inside of the drawing needle rod (11) and is used to fix the fixing rod (42) inside the drawing needle rod (11).

8. The subcutaneous tunnel establishment device for tunnel-type PICC catheterization according to claim 5, characterized in that: The puncture needle (2) includes a puncture needle rod (21) sleeved on the outside of the withdrawal needle rod (11), and a puncture needle head (22) is fixed to one end of the puncture needle rod (21). When the puncture needle driving member (3) is inserted into the withdrawal needle (1), the push plate (325) contacts the inner wall of the puncture needle rod (21).

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