Conduit connecting structure

Abstract

The utility model relates to the technical field of medical instruments, in particular to a catheter connecting structure. The catheter connecting structure is used for achieving connection between catheters and comprises connecting pieces and displacement locking mechanisms, the displacement locking mechanisms are located between the adjacent connecting pieces and comprise rotating shafts, elastic bodies and main body parts, and first through holes are formed in the main body parts; the rotating shaft can be accommodated in the first through hole and is movably connected with the connecting piece at the near end through the first through hole; a first blind hole is formed in the main body part, the elastic body can be contained in the first blind hole, one end of the elastic body in the axial direction abuts against the closed end of the first blind hole, and the other end of the elastic body can stretch out of the first blind hole to abut against the inner wall of the connecting piece close to the near end. The displacement locking mechanism is movably connected with the connecting piece close to the near end through a rotating shaft and connected with the connecting piece close to the far end in a clamped mode. The locking device has the advantages of being simple in structure and flexible in locking.

Description

Technical Field

[0001] This application relates to the technical field of medical devices, and particularly to a catheter connection structure. Background Art

[0002] Catheters are common medical devices in the medical field. Common catheter components include outer tubes, inner tubes, catheter sheaths, dilators, etc. During human interventional surgeries, it is often necessary to first establish a medical channel for the surgery through the cooperation of different catheters.

[0003] Currently, the connection structures between different catheters are often connected in a spiral manner. Since this connection method can only achieve stable locking when reaching the root of the thread, there are problems such as fixed locking positions and inability to flexibly adjust.

[0004] Therefore, there is an urgent need for a catheter connection structure that can achieve flexible locking. Utility Model Content

[0005] The purpose of this application is to provide a catheter connection structure that can achieve flexible locking.

[0006] The embodiments of this application can be implemented through the following technical solutions:

[0007] A catheter connection structure for realizing internal connection of catheter components. The catheter components include N catheters and the catheter connection structure, where N≥2. The catheter connection structure includes connectors corresponding to the catheters one by one. The N catheters are coaxially sleeved in sequence, and the proximal ends are connected to their corresponding connectors. The catheters can achieve relative axial displacement between the catheters through the connectors;

[0008] It further includes at least one displacement locking mechanism located between adjacent connectors;

[0009] The displacement locking mechanism includes a rotating shaft, an elastic body, and a main body part. The main body part is provided with a first through hole. The rotating shaft can be accommodated in the first through hole and is movably connected to the connector near the proximal end through the first through hole; the main body part is provided with a first blind hole. The elastic body can be accommodated in the first blind hole. One end of the elastic body in its axial direction abuts against the closed end of the first blind hole, and the other end can extend out of the first blind hole and abut against the inner wall of the connector near the proximal end. The displacement locking mechanism is movably connected to the connector near the proximal end through the rotating shaft and is snap-connected to the connector near the distal end.

[0010] Optionally, the connecting member includes a first connecting member and a second connecting member, the first connecting member is located at the distal end, the second connecting member is located at the proximal end, the second connecting member is provided with a second through hole cooperating with the rotating shaft, and the second through hole and the first through hole can be coaxially arranged to form a space for the rotating shaft to rotate.

[0011] Optionally, the connecting member comprises a first connecting member, a second connecting member and at least one third connecting member, the first connecting member is located at the distal end, the second connecting member is located at the proximal end, and the third connecting member is located between the first connecting member and the second connecting member;

[0012] The second connecting member and the third connecting member are provided with a second through hole matched with the rotating shaft, and the second through hole and the first through hole can be coaxially arranged to form a space for the rotating shaft to rotate.

[0013] Further, the first connecting member includes a first matching portion, the first matching portion is arranged toward the second connecting member, the first matching portion is arranged away from the opening end of the first blind hole, the first matching portion is arranged along the axial direction of the catheter assembly, and the main body can form a locking state with the first matching portion during the displacement process.

[0014] Furthermore, the first connecting member and the third connecting member include a first matching portion, the first matching portion is arranged toward the proximal end, the first matching portion is arranged away from the opening end of the first blind hole, the first matching portion is arranged along the axial direction of the catheter assembly, and the main body can form a locking state with the first matching portion during the displacement process.

[0015] Furthermore, the first matching portion is a plate-shaped structure, and a zigzag track matching with the main body is provided on the end surface thereof facing the main body.

[0016] Furthermore, the first connecting member and the third connecting member also include a first connecting portion and a second matching portion, the first connecting portion is a tubular structure, the catheter can be sleeved in the first connecting portion and connected to the first connecting portion; the second matching portion is connected to the outer periphery of the first connecting portion, and the first matching portion is connected to the side of the second matching portion facing the proximal end.

[0017] Furthermore, the second connecting member and the third connecting member include a second connecting portion and a third matching portion, the second connecting portion is a tubular structure, the catheter can be sleeved in the second connecting portion and connected to the second connecting portion; the third matching portion is connected to the outer periphery of the second connecting portion, the third matching portion is provided with a second through hole and a third through hole, and the main body can extend out of the third through hole to form a locking state with the first matching portion.

[0018] Further, the second connecting member and the third connecting member further include a recessed portion located on the outer periphery of the third mating portion. The first mating portion can be received within the recessed portion, and one side of the recessed portion can limit the circumferential rotation of the first mating portion.

[0019] The catheter connection structure provided by the embodiment of the present application has at least the following beneficial effects:

[0020] (1) The displacement locking mechanism in the present application realizes the connection of the connecting members through the rotating shaft, the elastic body, and the main body portion. When the main body portion is displaced in the axial direction of the first catheter, the main body portion can rotate around the rotating shaft, and at the same time, the elastic body can squeeze the main body portion under its own elastic action to realize the movement and restoration of the position of the main body portion in the axial direction of the elastic body, so as to realize flexible locking.

[0021] (2) The first mating portion is provided on the first connecting member and the third connecting member in the present application, and a serrated track for mating with the main body portion is provided on the end surface of the first mating portion. While the main body portion rotates around the rotating shaft, it can be displaced in the axial direction of the catheter on the serrated track. At the same time, the elastic body can squeeze the main body portion under the elastic action to lock it at different positions on the serrated track, so as to realize the hierarchical locking between the connecting members.

[0022] (3) The second connecting member and the third connecting member in the present application are provided with a recessed portion through which the first mating portion can be received within the recessed portion, and one side of the recessed portion can limit the circumferential rotation of the first mating portion. The displacement locking mechanism can be disengaged from the serrated track of the first mating portion by rotating the second connecting member or the third connecting member in a direction away from the recessed portion, thereby realizing the release of the locked state between the connecting members. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is an overall structure diagram of the catheter connection structure for two catheters;

[0024] Figure 2 It is an exploded view of the catheter connection structure for two catheters;

[0025] Figure 3 It is an overall structure diagram of the first connecting member in the present application;

[0026] Figure 4 It is an overall structure diagram of the second connecting member in the present application;

[0027] Figure 5 It is an overall structure diagram of the second connecting member from another angle in the present application;

[0028] Figure 6 It is an overall structure diagram of the main body portion in the present application;

[0029] Figure 7It is the overall structure diagram of another angle of the main body part in this application;

[0030] Figure 8 It is the exploded view of the catheter connection structure of three catheters;

[0031] Figure 9 It is the overall structure diagram of the third connecting piece;

[0032] Figure 10 It is the exploded view of the catheter connection structure of four catheters.

[0033] Reference numerals: 1, the first connecting piece; 11, the first mating part; 12, the first connecting part; 13, the second mating part; 14, the first holding part; 2, the second connecting piece; 21, the second through hole; 22, the second connecting part; 23, the third mating part; 24, the third through hole; 25, the second holding part; 3, the displacement locking mechanism; 31, the rotating shaft; 32, the elastic body; 33, the main body part; 331, the first through hole; 332, the first blind hole; 4, the third connecting piece. Detailed implementation manners

[0034] Hereinafter, this application will be further described based on the preferred implementation manners with reference to the drawings.

[0035] The terms used in this specification are for the purpose of describing the embodiments of this application, but are not intended to limit this application. Unless otherwise clearly defined and limited, if the terms "arranged", "connected", "connected to" are used, they should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, a direct connection, or an indirect connection through an intermediate medium, and it can be the communication inside two components. For those skilled in the art, the specific meanings of the above terms in this application can be specifically understood.

[0036] In addition, in the description of the embodiments of this application, for the convenience of understanding, various components in the drawings are enlarged or reduced, but this approach is not intended to limit the protection scope of this application.

[0037] To make the technical problems solved by this application, the technical solutions adopted, and the achieved technical effects clearer, the technical solutions of this application will be further described below with reference to the drawings and through specific implementation manners. For the convenience of description, the terms "proximal end" and "distal end" are used below, where the "proximal end" refers to the end close to the operator, and the "distal end" refers to the end far from the operator and deep into the body.

[0038] The present application provides a catheter connection structure for realizing the internal connection of a catheter assembly. The catheter assembly includes N catheters and a catheter connection structure, where N≥2. The catheter connection mechanism includes connectors corresponding to the catheters one by one. The N catheters are coaxially sleeved in sequence, and the proximal end is connected to its corresponding connector. The catheters can achieve relative axial displacement between the catheters through the connectors to realize the adjustment of the relative positions between the catheters.

[0039] To achieve flexible adjustment of the relative positions between the catheters, the catheter connection structure in the present application further includes at least one displacement locking mechanism 3, as Figure 2 、 Figure 6 and Figure 7 shown. The displacement locking mechanism 3 includes a rotating shaft 31, an elastic body 32 and a main body 33. The main body 33 is provided with a first through hole 331. The rotating shaft 31 is accommodated in the first through hole 331 and is movably connected to the connector near the proximal end through the first through hole 331. The main body 33 is provided with a first blind hole 332. The elastic body 32 can be accommodated in the first blind hole 332, and one end of the elastic body 32 in its axial direction abuts against the closed end of the first blind hole 332, and the other end can extend out of the first blind hole 332 to abut against the inner wall of the connector near the proximal end. The main body 33 can be rotationally engaged with the connector near the distal end while rotating around the rotating shaft 31 to achieve automatic locking between the catheters. When the main body 33 displaces along the axial direction of the first catheter, the main body 33 can rotate around the rotating shaft 31, and at the same time, the elastic body 32 can squeeze the main body 33 under its own elastic action to achieve the movement and recovery of the position of the main body 33 along the axial direction of the elastic body 32.

[0040] Embodiment 1

[0041] This embodiment provides a specific implementation method for connecting two catheters. Figure 1 and Figure 2 respectively show the overall structure diagram and the exploded view of the catheter connection structure of the two catheters, as Figure 1 and Figure 2 shown. The catheter assembly includes a first catheter, a second catheter and a catheter connection structure. The catheter connection structure includes a first connector 1, a second connector 2 and a displacement locking mechanism 3. The displacement locking mechanism 3 is located between the first connector 1 and the second connector 2, and the second connector 2 is located at the proximal end of the first connector 1.

[0042] Furthermore, the first connector 1 is connected to the proximal end of the first catheter, and the second connector 2 is connected to the proximal end of the second catheter. The synchronous displacement of the first catheter and the second catheter can be achieved through the movement of the first connector 1 and the second connector 2, so as to realize the adjustment of the relative positions of the first catheter and the second catheter.

[0043] Furthermore, as Figure 2 、 Figure 6and Figure 7 As shown, the rotating shaft 31 of the displacement locking mechanism 3 is received in the first through hole 331 and is movably connected to the second connecting member 2 through the first through hole 331; one end of the elastic body 32 in its axial direction abuts against the closed end of the first blind hole 332, and the other end can extend out of the first blind hole 332 and abut against the inner wall of the second connecting member 2. The main body portion 33 can rotate around the rotating shaft 31 while being engaged with the first connecting member 1 to achieve automatic locking of the first connecting member 1 and the second connecting member 2. When the main body portion 33 is displaced in the axial direction of the first conduit, the main body portion 33 can rotate around the rotating shaft 31, and at the same time, the elastic body 32 can squeeze the main body portion 33 under its own elastic action to achieve the movement and restoration of the position of the main body portion 33 in the axial direction of the elastic body 32.

[0044] Further, as Figure 1 , Figure 2 and Figure 4 shown, the second connecting member 2 is provided with a second through hole 21 that cooperates with the rotating shaft 31. The second through hole 21 and the first through hole 331 can be coaxially arranged to form a space for the rotation of the rotating shaft 31. On the one hand, the preliminary fixation of the position of the displacement locking mechanism 3 is achieved, and on the other hand, the main body portion 33 can rotate relative to the second connecting member 2.

[0045] Further, the first connecting member 1 includes a first mating portion 11. The first mating portion 11 faces the second connecting member 2, is arranged facing away from the open end of the first blind hole 332, and is arranged in the axial direction of the first conduit. The main body portion 33 can cooperate with the first mating portion 11 to form a locked state during displacement to achieve locking of the relative positions of the first conduit and the second conduit.

[0046] Further, as Figure 2 and Figure 3 shown, the first mating portion 11 is of a plate-like structure, and its end face facing the main body portion 33 is provided with a serrated track that cooperates with the main body portion 33. While the main body portion 33 rotates around the rotating shaft 31, it can move in the axial direction of the first conduit on the serrated track, and at the same time, the elastic body 32 can squeeze the main body portion 33 under its own elastic action to lock it at different positions on the serrated track to achieve hierarchical locking of the first connecting member 1 and the second connecting member 2.

[0047] Further, the slope surface of the serrated track faces the second connecting member 2, so that when the second connecting member 2 moves in the direction close to the first connecting member 1, automatic locking of the first connecting member 1 and the second connecting member 2 can be achieved.

[0048] In some specific embodiments of the present application, as Figure 3As shown, the first connecting member 1 further includes a first connecting portion 12. The first connecting portion 12 is a tubular structure, and the first conduit can be sleeved within the first connecting portion 12 and connected to the first connecting portion 12 to achieve a stable connection between the first connecting member 1 and the first conduit.

[0049] In some specific embodiments of the present application, the first connecting portion 12 can be connected to the first conduit by means such as gluing, welding, fixed connection, integral molding, etc. It can be imagined that no matter which connection method is adopted, as long as a stable connection between the first conduit and the first connecting portion 12 can be achieved.

[0050] Furthermore, as Figure 3 shown, the first connecting member 1 further includes a second fitting portion 13. The second fitting portion 13 is connected to the outer periphery of the first connecting portion 12, and the first fitting portion 11 is connected to the side of the second fitting portion 13 facing the second connecting member 2 to provide an activity space and an avoidance space for the displacement locking mechanism 3.

[0051] In some preferred embodiments of the present application, for the convenience of the operator's operation, the first connecting member 1 further includes a first hand-held portion 14. The first hand-held portion 14 is a plate-shaped protrusion connected to the outer peripheries of the first connecting portion 12 and the second fitting portion 13.

[0052] In some specific embodiments of the present application, as Figure 4 shown, the second connecting member 2 includes a second connecting portion 22. The second connecting portion 22 is a tubular structure, and the second conduit can be sleeved within the second connecting portion 22 and connected to the second connecting portion 22 to achieve a stable connection between the second connecting member 2 and the second conduit.

[0053] In some specific embodiments of the present application, the second connecting portion 22 can be connected to the second conduit by means such as gluing, welding, fixed connection, integral molding, etc. It can be imagined that no matter which connection method is adopted, as long as a stable connection between the second conduit and the second connecting portion 22 can be achieved.

[0054] Furthermore, as Figure 4 shown, the second connecting member 2 further includes a third fitting portion 23. The third fitting portion 23 is connected to the outer periphery of the second connecting portion 22. The third fitting portion 23 is provided with a second through hole 21 and a third through hole 24. The rotating shaft 31 can pass through the second through hole 21 and be movably connected to the second through hole 21. The main body portion 33 can extend out of the third through hole 24 to form a locked state with the serrated track of the first fitting portion 11 to provide an activity space and an avoidance space for the displacement locking mechanism 3.

[0055] In some preferred embodiments of the present application, for the convenience of the operator's operation, the second connecting member 2 further includes a second hand-held portion 25. The second hand-held portion 25 is a plate-shaped protrusion connected to the outer peripheries of the second connecting portion 22 and the third fitting portion 23.

[0056] In some preferred embodiments of the present application, as Figure 5 shown, the second connecting member 2 further includes a recessed portion 26. The recessed portion 26 is located on the outer periphery of the third engaging portion 23. The first engaging portion 11 can be received within the recessed portion 26, and one side of the recessed portion 26 can limit the circumferential rotation of the first engaging portion 11. On the one hand, the circumferential rotation of the first connecting member 1 and the second connecting member 2 can be limited; on the other hand, the displacement locking mechanism 3 can be disengaged from the serrated track of the first engaging portion 11 by rotating the second connecting member in a direction away from the recessed portion 26, thereby realizing the unlocking of the first connecting member 1 and the second connecting member 2.

[0057] Embodiment Two

[0058] As Figure 8 shown, the difference between Embodiment Two and Embodiment One is that in this embodiment, the connection of three catheters is realized. The connecting members include a first connecting member 1, a second connecting member 2, and a third connecting member 4. The first connecting member 1 is located at the distal end, the second connecting member 2 is located at the proximal end, and the third connecting member 4 is located between the first connecting member 1 and the second connecting member 2. The second connecting member 2 and the third connecting member 4 are provided with second through holes 21 that cooperate with the rotating shaft 31. The second through holes 21 and the first through hole 331 can be coaxially arranged to form a space for the rotation of the rotating shaft 31. On the one hand, the preliminary fixation of the position of the displacement locking mechanism 3 is realized; on the other hand, the main body portion 33 can rotate relative to the second connecting member 2 and the third connecting member 4.

[0059] Furthermore, as Figure 9 shown, the third connecting member 4 includes a first engaging portion 11. The first engaging portion 11 is arranged towards the proximal end, the first engaging portion 11 is arranged at the opening end facing away from the first blind hole 332, and the first engaging portion 11 is arranged along the axial direction of the catheter assembly. The main body portion 33 can cooperate with the first engaging portion 11 to form a locked state during the displacement process to realize the locking of the relative positions between the catheters.

[0060] Furthermore, the first engaging portion 11 is of a plate-like structure, and its end face facing the main body portion 33 is provided with a serrated track that cooperates with the main body portion 33. While the main body portion 33 rotates around the rotating shaft 31, it can move along the axial direction of the first catheter on the serrated track. At the same time, the elastic body 32 can squeeze the main body portion 33 under its own elastic action to lock it at different positions on the serrated track, so as to realize the hierarchical locking of the third connecting member 41 with the second connecting member 2 and the first connecting member 1.

[0061] Furthermore, the slope surface of the serrated track is arranged towards the proximal end, so that when the second connecting member 2 and the third connecting member 4 move in a direction close to the first connecting member 1, the automatic locking of the third connecting member 4 with the second connecting member 2 and the first connecting member 1 can be realized.

[0062] Further, the third connecting member 4 further includes a first connecting portion 12. The first connecting portion 12 is a tubular structure, and the catheter can be sleeved in the first connecting portion 12 and connected to the first connecting portion 12 to achieve a stable connection between the third connecting member 4 and its corresponding catheter.

[0063] In some specific embodiments of the present application, the first connecting portion 12 can be connected to the first catheter by means of gluing, welding, fixed connection, integral molding, etc. It can be imagined that no matter which connection method is adopted, as long as a stable connection between the catheter and the first connecting portion 12 can be achieved.

[0064] Further, the third connecting member 4 further includes a second mating portion 13. The second mating portion 13 is connected to the outer periphery of the first connecting portion 12, and the first mating portion 11 is connected to the proximal side of the second mating portion 13 to provide an activity space and an avoidance space for the displacement locking mechanism 3.

[0065] In some preferred embodiments of the present application, for the convenience of the operator's operation, the third connecting member 4 further includes a first hand-held portion 14. The first hand-held portion 14 is a plate-shaped protrusion connected to the outer peripheries of the first connecting portion 12 and the second mating portion 13.

[0066] In some specific embodiments of the present application, the third connecting member 4 further includes a second connecting portion 22. The second connecting portion 22 is a tubular structure. The second connecting portion 22 and the first connecting portion 12 are communicated to form a channel for catheter connection. The catheter can be sleeved in the first connecting portion 12 and the second connecting portion 22 and connected to the first connecting portion 12 and the second connecting portion 22 to achieve a stable connection between the third connecting member 4 and the catheter.

[0067] In some specific embodiments of the present application, the second connecting portion 22 can be connected to the second catheter by means of gluing, welding, fixed connection, integral molding, etc. It can be imagined that no matter which connection method is adopted, as long as a stable connection between the catheter and the second connecting portion 22 can be achieved.

[0068] Further, the third connecting member 4 further includes a third mating portion 23. The third mating portion 23 is connected to the outer periphery of the second connecting portion 22. The third mating portion 23 is provided with a second through hole 21 and a third through hole 24. The rotating shaft 31 can pass through the second through hole 21 and be movably connected to the second through hole 21. The main body portion 33 can extend out of the third through hole 24 to form a locked state with the serrated track of the first mating portion 11 to provide an activity space and an avoidance space for the displacement locking mechanism 3.

[0069] In some preferred embodiments of the present application, the third connecting member 4 further includes a recess 26 located on the outer periphery of the third engaging portion 23. The first engaging portion 11 can be received within the recess 26, and one side of the recess 26 can limit the circumferential rotation of the first engaging portion 11. On the one hand, it can limit the circumferential rotation of the third connecting member 4 with the first connecting member 1 and the second connecting member 2. On the other hand, the displacement locking mechanism 3 can be disengaged from the serrated track of the first engaging portion 11 by rotating the second connecting member 2 and the third connecting member 4 in a direction away from the recess 26, thereby realizing the unlocking between the connecting members.

[0070] Embodiment III

[0071] As Figure 10 shown, the difference between Embodiment III and Embodiment II is that in this embodiment, the connection of four conduits is realized, and the connecting members include a first connecting member 1, a second connecting member 2, and two third connecting members 4.

[0072] It can be imagined that when it is necessary to connect more conduits, only the number of the third connecting members 4 needs to be increased.

[0073] The specific embodiments of the present application have been described in detail above. For those skilled in the art of the present technology, without departing from the principle of the present application, several improvements and modifications can still be made to the present application, and these improvements and modifications also fall within the protection scope of the claims of the present application.

Claims

1. A catheter connection structure for realizing internal connection of a catheter assembly, wherein the catheter assembly comprises N catheters and the catheter connection structure, N ≥ 2, wherein the catheter connection structure comprises connectors corresponding to the catheters one by one, wherein the N catheters are coaxially sleeved in sequence, and the proximal ends are connected to the corresponding connectors, and the catheters can realize relative axial displacement between the catheters through the connectors, characterized in that: It also includes at least one displacement locking mechanism, wherein the displacement locking mechanism is located between adjacent connecting members; The displacement locking mechanism includes a rotating shaft, an elastic body and a main body. The main body is provided with a first through hole, and the rotating shaft can be accommodated in the first through hole and movably connected with the connecting piece near the proximal end through the first through hole; the main body is provided with a first blind hole, and the elastic body can be accommodated in the first blind hole. One end of the elastic body along the axial direction thereof abuts against the closed end of the first blind hole, and the other end can extend out of the first blind hole and abut against the inner wall of the connecting piece near the proximal end. The displacement locking mechanism is movably connected with the connecting piece near the proximal end through the rotating shaft and is engaged with the connecting piece near the distal end.

2. A catheter connection structure according to claim 1, characterized in that: The connecting member includes a first connecting member and a second connecting member, the first connecting member is located at the distal end, the second connecting member is located at the proximal end, the second connecting member is provided with a second through hole that cooperates with the rotating shaft, and the second through hole and the first through hole can be coaxially arranged to form a space for the rotating shaft to rotate.

3. A catheter connection structure according to claim 1, characterized in that: The connecting member comprises a first connecting member, a second connecting member and at least one third connecting member, the first connecting member is located at the distal end, the second connecting member is located at the proximal end, and the third connecting member is located between the first connecting member and the second connecting member; The second connecting member and the third connecting member are provided with a second through hole matched with the rotating shaft, and the second through hole and the first through hole can be coaxially arranged to form a space for the rotating shaft to rotate.

4. A catheter connection structure according to claim 2, characterized in that: The first connecting member includes a first matching portion, the first matching portion is arranged toward the second connecting member, the first matching portion is arranged away from the opening end of the first blind hole, the first matching portion is arranged along the axial direction of the catheter assembly, and the main body can form a locking state with the first matching portion during the displacement process.

5. A catheter connection structure according to claim 3, characterized in that: The first connecting member and the third connecting member include a first matching portion, the first matching portion is arranged toward the proximal end, the first matching portion is arranged away from the opening end of the first blind hole, the first matching portion is arranged along the axial direction of the catheter assembly, and the main body can form a locking state with the first matching portion during the displacement process.

6. A catheter connection structure according to claim 4 or 5, characterized in that: The first matching portion is a plate-shaped structure, and a sawtooth track matching with the main body is arranged on the end surface thereof facing the main body.

7. A catheter connection structure according to claim 5, characterized in that: The first connecting member and the third connecting member also include a first connecting portion and a second matching portion. The first connecting portion is a tubular structure, and the catheter can be sleeved in the first connecting portion and connected to the first connecting portion; the second matching portion is connected to the outer periphery of the first connecting portion, and the first matching portion is connected to the side of the second matching portion facing the proximal end.

8. The catheter connection structure according to claim 5, characterized in that: The second connecting member and the third connecting member include a second connecting portion and a third matching portion. The second connecting portion is a tubular structure. The catheter can be sleeved in the second connecting portion and connected to the second connecting portion. The third matching portion is connected to the outer periphery of the second connecting portion. The third matching portion is provided with a second through hole and a third through hole. The main body can extend out of the third through hole to form a locking state with the first matching portion.

9. A catheter connection structure according to claim 8, characterized in that: The second connecting member and the third connecting member further include a recessed portion, the recessed portion is located at the outer periphery of the third matching portion, the first matching portion can be accommodated in the recessed portion, and one side of the recessed portion can limit the circumferential rotation of the first matching portion.

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