Guiding tube, guiding assembly and drainage assembly for subcutaneous sneaking in drainage operation

Abstract

The utility model relates to a guiding tube, a guiding assembly and a drainage assembly for subcutaneous steeping in a drainage operation, and relates to the technical field of medical instruments. The guiding tube comprises a tube body, a through hole penetrating through the two ends of the tube body in the axial direction of the tube body is formed in the tube body, the tube body comprises a standard section and a necking section, the diameter of the necking section is smaller than that of the standard section, and the through hole in the necking section is used for being connected with a subcutaneous traction needle; the diameter of the through hole in the standard section is larger than the outer diameter of the drainage tube, and the drainage tube penetrates through the through hole; or a connecting structure is arranged at one end, far away from the necking section, of the standard section and used for connecting the drainage end of the drainage tube. The utility model further discloses a guiding assembly comprising the guiding tube and a drainage assembly. The guide tube can be matched with a small-size subcutaneous traction needle to construct a subcutaneous tunnel through the necking section, the situation that when a thick drainage tube and a thick guide tube are placed, a thick subcutaneous traction needle needs to be used for traction of the guide tube, and consequently large scalp injury is caused is avoided, and meanwhile the small-size subcutaneous traction needle facilitates operation and use of a doctor.

Description

Technical Field

[0001] The present application relates to the technical field of medical devices, and in particular to a guide tube, a guide assembly, and a drainage assembly for subcutaneous drainage in drainage surgery. Background Art

[0002] Drainage is a common treatment in modern medicine. It involves placing a drainage tube during various cavity surgeries to drain pus and tissue exudate from the cavity, alleviating local symptoms and accelerating recovery. For example, external cranial drainage has become one of the most important and common procedures in neurosurgery, used to treat conditions such as craniocerebral trauma, cerebral hemorrhage, intracranial infection, and hydrocephalus.

[0003] Clinically, the risk of drainage infection increases with prolonged drainage. Subcutaneous drainage tube placement is a medical technique used to reduce the risk of postoperative infection. This technique involves inserting a drainage tube subcutaneously and securing it away from the wound, thereby reducing the risk of infection. This technique is particularly effective in reducing the risk of tube blockage and intracranial infection during cranial drainage surgery.

[0004] There are two types of drainage tubes currently used in drainage surgery: single-lumen drainage tubes and multi-lumen drainage tubes. Figure 1 and Figure 2 As shown, the drainage end 31 of the single-lumen drainage tube 100 is a blind end, and the non-drainage end 32 is an open end, and the non-drainage end 32 of the single-lumen drainage tube 100 has no branches. During the subcutaneous sneaking process of the single-lumen drainage tube 100, the opening of the non-drainage end 32 of the single-lumen drainage tube 100 is connected to the tail of the subcutaneous traction needle 20. After the drainage end 31 of the single-lumen drainage tube 100 is successfully placed through the skull hole 301 of the patient's skull 300, the non-drainage end 32 of the single-lumen drainage tube 100 is moved away from the wound through the subcutaneous sneaking operation, and the single-lumen drainage tube 100 is led out through the subcutaneous tunnel outlet 302 and fixed. Figure 3 and Figure 4As shown, the drainage end 31 of the multi-lumen drainage tube 200 is also a blind end, but the non-drainage end 32 of the multi-lumen drainage tube 200 has a branch, and it is impossible to connect the subcutaneous traction needle 20 through its non-drainage end 32 to form a subcutaneous tunnel. Therefore, it is impossible to use the method of the single-lumen drainage tube 100 for tube implantation. During the subcutaneous sneaking of the multi-lumen drainage tube 200, it is necessary to first insert the drainage end 31 of the multi-lumen drainage tube 200 through the subcutaneous tunnel exit 302, perform a subcutaneous sneaking operation to reach the skull hole 301 of the patient's skull 300, and then bend the multi-lumen drainage tube 200 to place its drainage end 31 through the skull hole 301 into the target area to achieve the same effect. Since the drainage end 31 of the multi-lumen drainage tube 200 is a blind end, it is not convenient to connect to the subcutaneous traction needle 20. Therefore, when implanting the multi-lumen drainage tube 200, there is a great deal of operational difficulty. At present, the subcutaneous sneaking of the multi-lumen drainage tube 200 mostly uses a subcutaneous traction needle 20 to pull the guide tube 10 into the subcutaneous tunnel in advance. The guide tube 10 is temporarily maintained in the subcutaneous tunnel, and then the drainage end 12 of the multi-lumen drainage tube 200 is passed through the guide tube 10 and led out from above the skull hole 301 to realize the subcutaneous passage of the multi-lumen drainage tube 200. Then the guide tube 10 is pulled out, and then the drainage end 12 of the multi-lumen drainage tube 200 is bent so that the drainage end 12 is placed into the target area through the skull hole 301.

[0005] However, during the aforementioned multi-lumen drainage tube placement process, the diameter of the guide tube used must be larger than the diameter of the multi-lumen drainage tube to facilitate its insertion. Consequently, the subcutaneous guide needle used with the guide tube is also relatively thick. This rigid, large subcutaneous traction needle can cause greater trauma and bleeding when inserted into the scalp. Furthermore, this large subcutaneous traction needle is heavy and inconvenient for doctors to use. Utility Model Content

[0006] In order to reduce damage to patients during drainage surgery, the present application provides a guide tube, a guide assembly, and a drainage assembly for subcutaneous movement during drainage surgery.

[0007] In the first aspect, the guide tube provided by this application adopts the following technical solutions:

[0008] A guide tube used for subcutaneous movement during drainage surgery comprises a tube body having through holes extending axially through both ends of the tube body, the tube body comprising a standard section and a tapered section, the diameter of the tapered section being smaller than the diameter of the standard section; the through hole in the tapered section being used to connect a subcutaneous traction needle, the diameter of the through hole in the standard section being larger than the outer diameter of the drainage tube and being used for the drainage tube to pass through; or a connecting structure is provided at one end of the standard section away from the tapered section for connecting to the drainage end of the drainage tube.

[0009] During the entire drainage tube placement process, the above-mentioned guide tube in this application needs to be used. When using it, first you need to confirm the starting position, use a subcutaneous traction needle to connect to the tapered section of the tube body, and use the subcutaneous traction needle to pull the guide tube from the subcutaneous tunnel exit of the drainage tube and lead it out from the preset implantation point. Then cut off the tapered section connected to the subcutaneous traction needle from the standard section, thereby pre-establishing a subcutaneous tunnel; then pass the drainage tube through the standard section of the guide tube and sneak along the preset subcutaneous tunnel. After that, the guide tube can be removed, or the end of the standard section away from the tapered section can be detachably connected to the drainage end of the drainage tube through a connecting structure. While removing the guide tube, the drainage tube can be pulled to sneak in the subcutaneous tunnel; finally, place the drainage end of the drainage tube into the target position for drainage.

[0010] By adopting the above-mentioned technical solution, the tapered section of the guide tube in the present application can be adapted to the subcutaneous traction needle of the existing single-lumen drainage tube. Therefore, the same model of subcutaneous traction needle can not only guide the placement of the single-lumen drainage tube, but also cooperate with the guide tube of the present application to assist in the placement of the multi-lumen drainage tube, thereby reducing the types of subcutaneous traction needles, saving management costs, and improving ease of use.

[0011] The guide tube in this application utilizes a tapered section to match a small-sized subcutaneous traction needle to construct a subcutaneous tunnel. This avoids the need to use a thicker subcutaneous traction needle to pull the guide tube when inserting a thicker drainage tube and guide tube, which would cause significant scalp damage, thereby greatly reducing trauma to the patient. At the same time, the small-sized subcutaneous traction needle is also convenient for doctors to operate and use.

[0012] Optionally, the length of the necked section is 1 / 4 to 1 / 20 of the length of the standard section.

[0013] By adopting the above technical solution, the necked section is mainly used to connect the subcutaneous traction needle, and will be cut off after the guide tube is placed. Therefore, it does not need to be too long. The above size ratio can ensure the smooth placement of the guide tube and the drainage tube, and avoid interference with the guide tube placement and material waste caused by the tube body being too long, and has better cost performance.

[0014] Optionally, the necking section has a tapered surface for smooth transition.

[0015] By adopting the above technical solution, the sudden change in the diameter of the guide tube can be avoided to prevent the guide tube from being blocked in the subcutaneous tunnel, thereby facilitating the placement and removal of the guide tube, and also reducing the secondary damage caused to the patient by the guide tube.

[0016] Optionally, the tube body is made of thermoplastic material.

[0017] The tube body in this application can be made of a heat-shrinkable tube made of materials such as PTFE, PVDF, and PE, or can be formed by heat-molding using heat-resistant plastic materials such as TPU and PVC. By adopting the above technical solution, one end of the guide tube can be easily and reliably formed into a tapered structure through a heat processing process, that is, an integrated tube body structure including a tapered section and a standard section is formed, which is simple in process and low in cost. The tapered section of the guide tube can be matched with a subcutaneous traction needle with a smaller diameter, thereby reducing damage to the human body and facilitating operation.

[0018] In the second aspect, the guidance component provided by this application adopts the following technical solutions:

[0019] A guide assembly used for subcutaneous sneaking during drainage surgery includes a subcutaneous traction needle and the above-mentioned guide tube, one end of the subcutaneous traction needle is a needle tip puncture end, and the other end is a connecting end; the connecting end of the subcutaneous traction needle can be inserted into the necked section of the guide tube and the connecting end of the subcutaneous traction needle is tightly fitted with the wall of the through hole in the necked section.

[0020] By adopting the above technical solution, a universal model of subcutaneous traction needle can be used, which can be suitable for the placement of single-lumen drainage tubes and directly connected to the non-drainage end of the single-lumen drainage tube, and can also be suitable for the placement of multi-lumen drainage tubes and connected to the tapered section of the guide tube in this application, thereby reducing the types of subcutaneous traction needles, saving management costs and improving ease of use.

[0021] Optionally, the connecting end of the subcutaneous traction needle has a plug rod and the plug rod can be inserted into the through hole of the necked section, and a snap-fit ​​protrusion is provided on the wall of the through hole of the necked section.

[0022] By adopting the above technical solution, the plug rod on the subcutaneous traction needle can be plugged into the through hole of the necking section, and the two are tightly matched to achieve a detachable connection, which is simple to disassemble and easy to use. Furthermore, the provision of a snap-fit ​​protrusion can improve the stability of the connection between the two.

[0023] Optionally, the outer diameter of the connecting rod is smaller than the outer diameter of the subcutaneous traction needle body, and the outer end surface of the connecting rod is an arc-shaped guide surface.

[0024] By adopting the above technical solution, the arc-shaped guide surface can play a guiding role, thereby facilitating the rapid and accurate insertion of the plug-in rod into the through hole of the necked section.

[0025] Optionally, the outer peripheral surface of the plug rod has a pagoda male plug structure or is provided with a clamping groove matching the clamping protrusion.

[0026] By adopting the above technical solution, a stable and reliable connection between the plug rod and the necked section of the tube body can be achieved, thereby preventing the subcutaneous traction needle from falling off during the process of traction of the guide tube.

[0027] In a third aspect, the drainage assembly provided by this application adopts the following technical solutions:

[0028] A drainage assembly for subcutaneous drainage in drainage surgery comprises a drainage tube and the above-mentioned guide assembly, wherein the outer diameter of the drainage tube is smaller than the inner diameter of the standard section of the tube body.

[0029] The procedure for use is as follows: The connecting end of the subcutaneous traction needle is connected to the tapered end of the guide tube, and the subcutaneous entry point is determined (usually at the exit of the subcutaneous tunnel of a traditional single-lumen drainage tube). The subcutaneous traction needle is then used to guide the guide tube through the subcutaneous process. After the tapered end of the guide tube reaches the skull hole, the tapered end connected to the subcutaneous traction needle is cut and removed from the standard section, forming a subcutaneous tunnel. The drainage tube is then advanced through the pre-set subcutaneous tunnel. Finally, the standard section of the guide tube is removed, and the drainage end of the drainage tube is placed in the pre-set position for drainage, and the non-drainage end of the drainage tube is secured. The entire operation is simple and efficient, and can be performed with a small-sized subcutaneous traction needle, reducing trauma to the patient and facilitating operation by the doctor.

[0030] Optionally, the drainage tube is a multi-lumen drainage tube or a single-lumen drainage tube, and a guide wire is further provided on the drainage tube.

[0031] By adopting the above technical solution, the application scope of the drainage assembly in this application is improved. The provision of a guide wire facilitates the accurate and smooth subcutaneous insertion of the drainage tube.

[0032] In summary, this application includes at least one of the following beneficial technical effects:

[0033] 1. The guide tube provided in this application facilitates the placement of the drainage tube, enables the drainage tube to sneak subcutaneously, reduces infection during the drainage process, and reduces the difficulty of placement.

[0034] 2. The guide tube in this application utilizes a tapered section that can match a small-sized subcutaneous traction needle to construct a subcutaneous tunnel, thereby avoiding the need to use a thicker subcutaneous traction needle to pull the guide tube when inserting a thicker drainage tube and guide tube, which would cause greater scalp damage, thereby greatly reducing trauma to the patient. At the same time, the small-sized subcutaneous traction needle also facilitates the doctor's operation.

[0035] 3. The tapered section of the guide tube in this application can be compatible with the subcutaneous traction needle of the existing single-lumen drainage tube. Therefore, the same model of subcutaneous traction needle can not only guide the placement of the single-lumen drainage tube, but also cooperate with the guide tube of this application to assist in the placement of the multi-lumen drainage tube, reducing the types of subcutaneous traction needles, saving management costs, and improving ease of use. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 It is a schematic diagram of an existing single-lumen drainage tube implant assembly in the background technology.

[0037] Figure 2 It is a schematic diagram of the implantation process of the existing single-lumen drainage tube in the background technology.

[0038] Figure 3 It is a schematic diagram of an existing multi-lumen drainage tube implant assembly in the background technology.

[0039] Figure 4 It is a schematic diagram of the implantation process of the existing multi-lumen drainage tube in the background technology.

[0040] Figure 5 It is a structural diagram of the drainage component in this application.

[0041] Figure 6 It is a structural diagram of the guide component in this application.

[0042] Figure 7 This is a structural diagram of the drainage component in use in this application.

[0043] In the picture:

[0044] 100, single-lumen drainage tube; 200, multi-lumen drainage tube; 300, skull; 301, skull hole; 302, subcutaneous tunnel exit;

[0045] 10. Guide tube; 11. Tube body; 111. Through hole; 112. Standard section; 113. Narrowing section; 114. Tapered surface; 115. Snap-fit ​​protrusion;

[0046] 20. Subcutaneous traction needle; 21. Needle tip puncture end; 22. Connecting end; 23. Connecting rod; 231. Pagoda male plug structure; 24. Curved guide surface;

[0047] 30. Drainage tube; 31. Drainage end; 32. Non-drainage end; 33. Drainage hole. DETAILED DESCRIPTION

[0048] The following is combined with Figure 5 -Attached Figure 7 , further details of this application are given.

[0049] The present embodiment discloses a guide tube for subcutaneous insertion during drainage surgery, a guide assembly including the guide tube, and a drainage assembly including the guide assembly; the guide tube is applied to the field of extracorporeal drainage and can be suitable for use with single-lumen drainage tubes or multi-lumen drainage tubes. In particular, it effectively improves the problem that thicker multi-lumen drainage tubes are difficult to insert subcutaneously, and can be matched with a small-sized subcutaneous traction needle to construct a subcutaneous tunnel, avoiding greater scalp damage caused by using a thicker subcutaneous traction needle to pull the guide tube when inserting a thicker drainage tube.

[0050] Example 1

[0051] Reference Figure 5 and Figure 6 As shown, the drainage assembly used for subcutaneous drainage in the drainage technique in the present application includes a drainage tube 30 and a guide assembly, one end of the drainage tube 30 is a drainage end 31, the drainage end 31 of the drainage tube 30 is a blind end, and a plurality of drainage holes 33 connected to the interior of the drainage tube 30 are opened on the outer peripheral surface of the drainage end 31 of the drainage tube 30; the other end of the drainage tube 30 is a non-drainage end 32, the non-drainage end 32 of the drainage tube 30 can be a single-cavity drainage tube without a branch structure, or can be a multi-cavity drainage tube with a branch structure.

[0052] Reference Figure 6 As shown, the guide assembly in the present application includes a guide tube 10 and a subcutaneous traction needle 20; one end of the subcutaneous traction needle 20 is a needle tip puncture end 21, and the other end is a connecting end 22; the connecting end 22 of the subcutaneous traction needle 20 has a connecting rod 23, the outer diameter of the connecting rod 23 is smaller than the outer diameter of the subcutaneous traction needle 20 body, and the outer end surface of the connecting rod 23 is an arc-shaped guide surface 24; the outer peripheral surface of the connecting rod 23 has a pagoda male plug structure 231 or is provided with a snap-in groove.

[0053] Reference Figure 6 As shown, the guide tube 10 includes a tube body 11, and the tube body 11 has a through hole 111 that runs through both ends of the tube body 11 along its axial direction. The tube body 11 includes a standard section 112 and a tapered section 113. The length of the tapered section 113 is 1 / 4 to 1 / 20 of the length of the standard section 112; the tapered section 113 is mainly used to connect the subcutaneous traction needle 20. The guide tube 10 will be cut off after the catheterization is completed, so it does not need to be too long. For example, the length of the tapered section 113 can be 1 / 5, 1 / 16 or 1 / 18 of the length of the standard section 112; the diameter of the tapered section 113 is smaller than the diameter of the standard section 112, and the inner diameter of the standard section 112 is larger than the outer diameter of the drainage tube 30. Preferably, the standard section 112 and the tapered section 113 are connected to each other. 3 is integrally formed; the tapered surface 114 of the tapered section 113 is provided with a smooth transition to prevent the guide tube 10 from being blocked in the subcutaneous tunnel due to a sudden change in the diameter of the guide tube 10, thereby facilitating the insertion and withdrawal of the guide tube 10 and reducing secondary damage to the patient caused by the guide tube 10. The tapered surface of the tapered section 113 can cover part or the entire length of the tapered section 113; the through hole 111 in the tapered section 113 is used to connect the subcutaneous traction needle 20, and the tapered section 113 can match the subcutaneous traction needle 20 with a smaller diameter. The inner diameter of the through hole 111 in the standard section 112 is larger than the outer diameter of the drainage tube 30, and the through hole 111 in the standard section 112 is used for the drainage tube 30 to pass through.

[0054] The tube body 11 in the present application is made of thermoplastic material. Specifically, the tube body 11 in the present application can be made of heat shrink tubing made of materials such as PTFE, PVDF, PE, etc., or can be formed by heat-molding using heat-resistant plastic materials such as TPU and PVC. One end of the guide tube 10 can be easily and reliably formed into a tapered structure through a heat processing process, that is, an integrated tube body structure including a necking section 113 and a standard section 112 is formed. The process is simple and the cost is low. Of course, the standard section 112 and the necking section 113 can also be made separately, and then the two sections are heated and welded.

[0055] Reference Figure 6 and Figure 7 As shown, the plug rod 23 of the subcutaneous traction needle 20 can be inserted into the through hole 111 of the tapered section 113. The through hole 111 of the tapered section 113 is provided with a snap-fitting protrusion 115 that matches the pagoda male plug structure 231 or snap-fitting groove on the outer circumference of the plug rod 23. The plug rod 23 on the subcutaneous traction needle 20 tightly fits the through hole 111 of the tapered section 113, achieving a detachable connection that is easy to assemble and disassemble and convenient to use. The snap-fitting protrusion 115 enhances the stability of the connection. The arcuate guide surface 24 at the end of the plug rod 23 of the subcutaneous traction needle 20 serves as a guide, thereby facilitating the quick and accurate insertion of the plug rod 23 into the through hole 111 of the tapered section 113.

[0056] In the present application, a guide wire is also provided on the drainage tube 30 to facilitate the accurate and smooth subcutaneous movement of the drainage tube 30 and its implantation into the target area.

[0057] The implementation principle is as follows: Figure 7 As shown, during the entire process of placing the drainage tube 30, the operating steps are as follows: the connecting end 22 of the subcutaneous traction needle 20 is connected to the narrowed section 113 of the guide tube 10 to determine the subcutaneous entry point (usually located at the subcutaneous tunnel exit 302 of the traditional single-lumen drainage tube), and then the subcutaneous traction needle 20 is used to drive the guide tube 10 to perform the subcutaneous sneaking process. After the narrowed section 113 of the guide tube 10 sneaks to the position of the skull hole 301, the narrowed section 113 connected to the subcutaneous traction needle 20 is cut off and removed from the standard section 112, and the standard section 112 of the guide tube 10 forms a subcutaneous tunnel; then the drainage tube 30 is sneaked along the subcutaneous tunnel provided by the standard section 112; finally, the standard section 112 of the guide tube 10 is removed, the drainage end 31 of the drainage tube 30 is placed at the preset position for drainage, and the non-drainage end 32 of the drainage tube 30 is fixed.

[0058] The tapered section 113 of the guide tube 10 in the present application can be adapted to the subcutaneous traction needle 20 of the existing single-lumen drainage tube. Therefore, the same model of subcutaneous traction needle 20 can not only guide the placement of a single-lumen drainage tube, but also cooperate with the guide tube 10 of the present application to assist in the placement of a multi-lumen drainage tube, thereby reducing the types of subcutaneous traction needles 20, saving management costs, and improving ease of use.

[0059] In this application, the guide tube 10 utilizes the tapered section 113 to accommodate a small-sized subcutaneous traction needle 20 for constructing a subcutaneous tunnel. This avoids the need to use a thicker subcutaneous traction needle 20 to pull the guide tube 10 when inserting a thicker drainage tube 30 and the guide tube 10, which could cause significant scalp damage. This significantly reduces trauma to the patient, while the small-sized subcutaneous traction needle 20 also facilitates operation by the doctor.

[0060] Example 2

[0061] This embodiment is substantially the same as embodiment 1, except that, in this embodiment, a connection structure is provided at the end of the standard section 112 of the tube body 11 away from the tapered section 113 for connection to the drainage end 31 of the drainage tube 30. During the entire process of placing the drainage tube 30, a subcutaneous traction needle 20 is connected to the tapered section 113 of the tube body 11. The subcutaneous traction needle 20 is used to pull the guide tube 10 through the subcutaneous tunnel exit 302 and out from the preset implantation point. The end of the standard section 112 away from the tapered section 113 is detachably connected to the drainage end 31 of the drainage tube 30 via the connection structure, allowing the drainage tube 30 to be pulled through the subcutaneous tunnel while simultaneously being pulled. Finally, the drainage end 31 of the drainage tube 30 is placed at the target location for drainage.

[0062] In this embodiment, the connecting structure can be an annular protrusion arranged on the outer wall of the drainage tube 30 and an annular groove arranged on the inner wall of the guide tube 10. The annular protrusion is located at the drainage end 31 of the drainage tube 30, and the annular groove is located at the end of the standard section 112 away from the necking section 113. The annular protrusion matches the annular groove, and the drainage end 31 of the drainage tube 30 is inserted into the port of the standard section 112. A detachable snap-fit ​​structure is realized by the annular protrusion and the annular groove; the connecting structure can also be a snap-fit ​​protrusion arranged on the inner wall of the guide tube 10, and the end of the standard section 112 away from the necking section 113 is a semicircular tube. The snap-fit ​​protrusion is located on the inner wall of the semicircular tube, and the snap-fit ​​protrusion cooperates with the drainage hole 33 of the drainage tube 30. The snap-fit ​​protrusion is embedded in the drainage hole 33 of the drainage tube 30 to form a detachable connection.

[0063] The examples of this specific embodiment are all preferred embodiments of this application and are not intended to limit the scope of protection of this application. Identical components are represented by the same reference numerals. Therefore, any equivalent changes made based on the structure, shape, and principle of this application should be included in the scope of protection of this application.

Claims

1. A guide tube for subcutaneous drainage, comprising a tube body (11), wherein the tube body (11) has a through hole (111) extending axially through both ends of the tube body (11), characterized in that: The tube body (11) comprises a standard section (112) and a narrowed section (113), wherein the diameter of the narrowed section (113) is smaller than the diameter of the standard section (112); the through hole (111) in the narrowed section (113) is used for connecting a subcutaneous traction needle (20); The through hole (111) in the standard section (112) has a diameter greater than the outer diameter of the drainage tube (30) for allowing the drainage tube (30) to pass through; or a connection structure is provided at one end of the standard section (112) away from the necked section (113) for connecting to the drainage end of the drainage tube (30).

2. The guide tube for subcutaneous drainage according to claim 1, characterized in that: The length of the necked section (113) is 1 / 4 to 1 / 20 of the length of the standard section (112).

3. The guide tube for subcutaneous drainage according to claim 1 or 2, characterized in that: The necking section (113) is provided with a tapered surface (114) for smooth transition.

4. The guide tube for subcutaneous drainage according to claim 1 or 2, characterized in that: The tube body (11) is made of thermoplastic material.

5. A guide assembly for subcutaneous drainage, characterized in that: It comprises a subcutaneous traction needle (20) and a guide tube (10) as described in any one of claims 1 to 4 above, one end of the subcutaneous traction needle (20) is a needle tip puncture end (21), and the other end is a connecting end (22); the connecting end (22) of the subcutaneous traction needle (20) can be inserted into the necking section (113) of the guide tube (10) and the connecting end (22) of the subcutaneous traction needle (20) is tightly fitted with the wall of the through hole (111) in the necking section (113).

6. The guide assembly for subcutaneous drainage according to claim 5, characterized in that: The connecting end (22) of the subcutaneous traction needle (20) has a plug-in rod (23) and the plug-in rod (23) can be inserted into the through hole (111) of the necking section (113). A snap-fit ​​protrusion (115) is provided on the hole wall of the through hole (111) of the necking section (113).

7. The guide assembly for subcutaneous drainage according to claim 6, characterized in that: The outer diameter of the connecting rod (23) is smaller than the outer diameter of the subcutaneous traction needle (20) body, and the outer end surface of the connecting rod (23) is an arc-shaped guide surface (24).

8. The guide assembly for subcutaneous drainage according to claim 6, characterized in that: The outer peripheral surface of the plug rod (23) has a pagoda male plug structure (231) or is provided with a clamping groove matching the clamping protrusion (115).

9. A drainage assembly for subcutaneous drainage during drainage surgery, characterized in that: The invention comprises a drainage tube (30) and a guide assembly according to any one of claims 5 to 8, wherein the outer diameter of the drainage tube (30) is smaller than the inner diameter of the standard section (112) of the tube body (11).

10. The drainage assembly for subcutaneous drainage according to claim 9, characterized in that: The drainage tube (30) is a multi-lumen drainage tube or a single-lumen drainage tube, and a guide wire is further provided on the drainage tube (30).

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