Tail integrated structure and medical catheter

Abstract

According to the tail integrated structure and the medical catheter, the tail integrated structure integrates two saline water paths and a cable path, meanwhile, the moving function of one saline water path is not affected, in addition, a lengthened flexible tail pipe of the tail integrated structure can also reduce transmission of the torsion effect, the problem that a tail line rotates and is wound is solved, and the service life of the tail line is prolonged. Meanwhile, the operation experience of an operator can be improved.

Description

Technical Field

[0001] The utility model relates to the technical field of medical equipment, in particular to a tail integrated structure and a medical catheter. Background Art

[0002] With the diversification of functions and the improvement of integration of modern cardiac surgical ablation catheters, there are more and more functional cables and pipelines at the tail end of the catheter, such as multiple independent cables plus saline pipelines, or multiple independent saline pipelines plus cables and motion control pipelines, etc. They share different functions, such as infusing physiological saline, transmitting electrical signals, and controlling catheter movements. During use, the cables at the tail end of the catheter need to be connected to other pipelines and equipment cables, and depending on the surgical method and the operator's operating habits, the catheter may be flipped multiple times, which brings the risk of the pipelines getting entangled and bent, resulting in saline infusion obstruction or wire breaking. When these situations occur, the catheter can only be replaced, which will affect the progress of the operation, prolong the operation time, and in severe cases endanger the patient's life. Therefore, a reasonable plan for the tail line layout and a solution that achieves a high degree of tail line integration without affecting the function is a necessary condition for a qualified catheter product.

[0003] The existing retractable needle ablation catheter tail line adopts a "2+1" solution, that is, two saline tubes plus one guide wire line. One saline tube and the guide wire line are fixed together and will move with the catheter operation, and the other saline tube is an independent structure. The saline tubes are all made of harder braided tubing, and the guide wire tubes are made of flexible tubing. This structure is well adapted to the structure and function of the catheter, distinguishing and merging the pipelines that will move. However, this structure still has the risk of the guide wire line being entangled in the saline tube after the catheter is flipped multiple times, and the overall length of the tail line under this structure is shorter, which may affect the operator's operating experience. Utility Model Content

[0004] The purpose of the utility model is to provide a tail integrated structure and a medical catheter to solve one or more problems existing in the prior art.

[0005] In order to solve the above problems, the utility model provides a tail integrated structure, including: a driving member, a screw, a connecting piece, a flexible tail pipe, an integrated end shell and an internal component;

[0006] The screw, the connector, the flexible tail pipe and the integrated end shell are connected in sequence from the distal end to the proximal end; the driving member is threadedly connected to the screw and is rotatably arranged around an axis, and the driving member is used to drive the screw to move along the axis by rotation;

[0007] The internal components include a fixed saline tube, a movable saline tube, a line tube, a first hard tube, a second hard tube and a third hard tube, wherein the first hard tube, the second hard tube and the third hard tube are respectively passed through the screw rod, and the proximal ends extend into the connecting piece respectively, wherein the first hard tube and the second hard tube are respectively fixedly connected to the screw rod, and the proximal ends are respectively connected to the line tube and the fixed saline tube, and the third hard tube is movably arranged relative to the screw rod, and the proximal end is connected to the movable saline tube; the fixed saline tube and the movable saline tube respectively extend from the inside of the connecting piece to pass through the proximal end of the integrated end shell, and the line tube extends from the inside of the connecting piece to the inside of the proximal end of the integrated end shell.

[0008] Optionally, in the tail integrated structure, the internal components also include a plurality of low-friction short tubes, which are arranged in sequence along the extension direction of the connector, the flexible tail tube and the integrated end shell to allow the movable brine pipe to pass through.

[0009] Optionally, in the tail integrated structure, the integrated end shell has a first guide structure, a second guide structure and a fixed limiting structure, the first guide structure and the second guide structure are respectively used to guide the movable saline tube and the fixed saline tube to pass through different positions at the proximal end of the integrated end shell, and the fixed limiting structure is used to fix the cable socket, wherein the first guide structure and the second guide structure are distributed on both sides of the fixed limiting structure.

[0010] Optionally, in the tail integrated structure, the first guide structure and the second guide structure respectively include a plurality of guide portions sequentially spaced apart along the length direction of the integrated end shell, and each of the guide portions has a guide hole.

[0011] Optionally, in the tail integrated structure, the integrated end shell includes a first shell and a second shell, the first shell and the second shell are transversely spliced ​​to form the integrated end shell, and the first guide structure, the second guide structure and the fixed limiting structure are formed by transversely splicing the first shell and the second shell.

[0012] Optionally, in the tail integrated structure, one of the first shell and the second shell has a boss on its inner wall, and the other has a groove on its inner wall, and the boss is correspondingly inserted into the groove to achieve splicing between the first shell and the second shell.

[0013] Optionally, in the tail integrated structure, the tail integrated structure also includes a cable anti-folding sleeve, and the integrated end shell is connected to the proximal end of the flexible tail tube through the cable anti-folding sleeve, and the cable anti-folding sleeve is used to reduce the bending angle of the movable brine tube, the fixed brine tube and the line tube relative to the integrated end shell when in use.

[0014] Optionally, in the tail integrated structure, the driving component includes a knob and a rotating sleeve, the knob is sleeved on the rotating sleeve, and the proximal end of the knob extends to extend out of the proximal end of the rotating sleeve; the rotating sleeve is threadedly connected to the screw, and the knob drives the rotating sleeve to rotate by rotating to drive the screw to move along the axis.

[0015] Optionally, in the tail integrated structure, the connecting member and the flexible tail tube are connected by a connecting tube, and the outer wall of the connecting member is circumferentially provided with a stabilizing ring, which contacts the inner surface of the portion of the knob extending outside the proximal end of the rotating sleeve to provide supporting force for the knob and low friction resistance for the movement of the knob.

[0016] Optionally, in the tail integrated structure, the connecting piece has three cavities which are axially penetrated and isolated from each other, the proximal ends of the first hard tube, the second hard tube and the third hard tube extend into the connecting piece from different cavities, and the axis of the connecting piece is located in the cavity into which the second hard tube extends.

[0017] The utility model also provides a medical catheter, comprising: a catheter body, a handle, a needle assembly and a tail integrated structure as described in any of the preceding items, wherein the driving member can be rotatably arranged at the proximal end of the handle, the needle assembly can be movably arranged to pass through the handle and the catheter body in sequence, and the proximal end of the needle assembly is fixedly connected to the distal end of the second hard tube, and the second hard tube moves with the movement of the screw to drive the needle assembly to move, so that the distal end of the needle assembly can extend out of the distal end of the catheter body.

[0018] In summary, the tail integrated structure and medical catheter provided by the utility model integrate two saline lines and cable lines together without affecting the activity function of one of the saline lines. In addition, the tail integrated structure increases the axial extension length of the catheter tail, which can reduce the transmission of the torsional effect, not only solving the problem of tail line rotation and entanglement, but also improving the operator's operating experience. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Those skilled in the art will appreciate that the accompanying drawings are provided for a better understanding of the present invention and do not constitute any limitation on the scope of the present invention, wherein:

[0020] Figure 1 A schematic diagram of the overall structure of a medical catheter provided by an embodiment of the utility model;

[0021] Figure 2 for Figure 1 Schematic diagram of the internal structure of region I shown in;

[0022] Figure 3 for Figure 1 The internal structure diagram of the II region is shown in FIG.

[0023] Figure 4 for Figure 1 Schematic diagram of the internal structure of region III shown in;

[0024] Figure 5 This is a schematic diagram of the structure of the connecting member in the embodiment of the utility model;

[0025] Figure 6 This is a schematic diagram of the structure after the integrated end shell is assembled in the embodiment of the utility model;

[0026] Figure 7 This is a schematic diagram of the structure of the integrated end shell before assembly in the embodiment of the utility model;

[0027] The descriptions of the reference numerals are as follows:

[0028] 1-catheter body; 2-handle; 3-driving member; 4-connecting tube; 5-flexible tail tube; 6-cable anti-folding sleeve; 7-integrated end shell; 8-fixed saline tube; 9-movable saline tube; 10-needle assembly; 11-screw; 12-second hard tube; 13-third hard tube; 14-connector; 15-stabilizing ring; 16-line tube; 17-low friction short tube; 18-cable socket;

[0029] 31-knob; 32-rotating sleeve;

[0030] 100-first cavity; 200-second cavity; 300-third cavity;

[0031] 71-first shell; 72-second shell;

[0032] 701 - first guide structure; 702 - fixed limiting structure; 703 - second guide structure. DETAILED DESCRIPTION

[0033] The utility model is further described in detail below in conjunction with the accompanying drawings and specific embodiments. According to the following description, the advantages and features of the utility model will be clearer. It should be noted that the drawings are all in a very simplified form and use non-precise proportions, which are only used to conveniently and clearly assist in explaining the purpose of the embodiments of the utility model. In addition, the structure shown in the drawings is often a part of the actual structure. In particular, the emphasis of each drawing to be shown is different, and sometimes different proportions are used. It should also be understood that, unless otherwise specified or pointed out, the terms "first", "second", "third" and the like in the specification are only used to distinguish the various components, elements, steps, etc. in the specification, rather than to represent the logical relationship or sequential relationship between the various components, elements, steps, etc., and thus, the features defined as "first", "second", and "third" can explicitly or implicitly include one or at least two of the features.

[0034] In this application document, "proximal" and "distal" refer to the relative orientation, relative position, and direction of components or actions relative to each other from the perspective of a doctor using the medical device. Although "proximal" and "distal" are not restrictive, "proximal" generally refers to the end of the medical device that is close to the doctor during normal operation, and "distal" generally refers to the end that first enters the patient's body.

[0035] See also Figure 1 The present utility model provides a medical catheter, which includes: a catheter body 1, a handle 2, a needle assembly 10 and a tail integrated structure. The catheter body 1 generally includes a main section and a bendable section. The main section is a slender tube body containing braided wires, and its distal end and proximal end are respectively used to connect the bendable section and the handle 2. The braided wire has the functions of supporting the tube body, preventing deformation, and transmitting the catheter torque in proportion. The handle 2 controls the bending shape of the bendable section by pulling the wire. The tail integrated structure enables the saline tube and the catheter tail line to be integrated into one body, and can drive the needle assembly 10 to move axially.

[0036] For more details, please see Figure 1 Combined with Figure 2-Figure 3The tail integrated structure includes: a driving member 3, a screw 11, a connector 14, a flexible tail tube 5, an integrated end shell 7 and an internal component; the screw 11, the connector 14, the flexible tail tube 5 and the integrated end shell 7 are connected in sequence from the distal end to the proximal end; the driving member 3 is threadedly connected to the screw 11 and is rotatably arranged around an axis, and the driving member 3 is used to drive the screw 11 to move along the axis by rotation. The catheter body 1, the handle 2, the screw 11, the connector 14, and the flexible tail tube 5 are coaxially arranged, so the axis can be understood as the axis of any one of the catheter body 1, the handle 2, the screw 11, the connector 14, and the flexible tail tube 5.

[0037] The internal components include a fixed saline tube 8, a movable saline tube 9, a line tube 16, a first hard tube (not shown in the figure), a second hard tube 12 and a third hard tube 13, wherein the first hard tube, the second hard tube 12 and the third hard tube 13 are respectively passed through the screw 11, and the proximal ends are respectively extended into the connecting piece 14, wherein the first hard tube and the second hard tube 12 are fixedly connected to the screw 11, and the proximal ends are respectively connected to the line tube 16 and the fixed saline tube 8, and the third hard tube 13 is movably arranged relative to the screw 11, and the proximal end is connected to the movable saline tube 9; the fixed saline tube 8 and the movable saline tube 9 extend from the inside of the connecting piece 14 to pass through the proximal end of the integrated end shell 7, respectively, and the line tube 16 extends from the inside of the connecting piece to the inside of the integrated end shell 7. It should be noted here that Figure 2 and Figure 3 In the internal structure diagram shown, the first hard tube and the line tube 16 are not marked, but it should be understood that, from the perspective of the diagram, the first hard tube and the line tube 16 are respectively located at positions blocked by the second hard tube 12 and the fixed brine tube 8.

[0038] After the tail integrated structure is assembled with the rest of the catheter components, the driving member 3 can be rotatably disposed at the proximal end of the handle 2, the needle assembly 10 can be movably disposed through the handle 2 and the catheter body 1 in sequence, and the proximal end of the needle assembly 10 is fixedly connected to the distal end of the second hard tube 12. The second hard tube 12 moves with the movement of the screw 11 to drive the needle assembly 10 to move, so that the distal end of the needle assembly 10 can extend out of the distal end of the catheter body 1, the first hard tube and the second hard tube 12 pass through the handle 2, and the distal end of the second hard tube 12 extends to extend into the catheter body 1, for example, can extend into the proximal end of the catheter body 1 or close to the proximal end of the catheter body 1.

[0039] The inner cavity of the third hard tube 13 is connected with the inner cavity of the movable saline tube 9 to form an external saline passage, and the saline in the external saline passage flows out from the gap between the needle assembly 10 and the distal end of the catheter body 1; the inner cavity of the needle assembly 10 and the inner cavity of the second hard tube 12 are connected with the inner cavity of the fixed saline tube 8 to form an internal saline passage, and the saline in the internal saline passage flows out from the distal end of the inner cavity of the needle assembly 10; the first hard tube 12 is connected with the inner cavity of the line tube 16 to form a cable passage, and the electrode wire passes through the proximal end of the cable passage and is electrically connected to the cable socket 18 provided at the proximal end of the integrated end shell 7.

[0040] It can be understood that the tail integrated structure provided in this embodiment, the line tube 16, the fixed saline tube 8 and the movable saline tube 9 are all made of flexible material, and are respectively connected to the screw 11 through the rigid first hard tube, the second hard tube 12 and the third hard tube 13, so that the two saline lines and the cable line are integrated together without affecting the movable function of one of the saline lines. In addition, the flexible tail tube 5 extended by the tail integrated structure increases the axial extension length of the tail of the catheter, which can reduce the transmission of the torsional effect, which not only solves the problem of rotation and entanglement of the tail line, but also improves the operator's operating experience.

[0041] The tail integrated structure provided in the embodiment of the utility model is described in further detail below.

[0042] The materials of the connector 14 and the integrated end shell 7 can be made of various hard polymer materials such as PE (polyethylene), PP (polypropylene), POM, hard PVC (polyvinyl chloride), PC (polycarbonate), ABS (acrylonitrile-butadiene-styrene plastic), PET (polyethylene terephthalate), PBT (polybutylene terephthalate), PMMA (polymethyl methacrylate), etc. The materials of the flexible tail pipe 5 can be made of various soft polymer materials such as rubber, silicone rubber, PU (polyurethane), TPU (thermoplastic polyurethane rubber) and soft PVC (polyvinyl chloride). The hard connector 14 and the flexible tail pipe 5 can be connected through a connecting pipe 17, and the material of the connecting pipe 17 can also be made of various soft polymer materials such as rubber, silicone rubber, PU (polyurethane), TPU (thermoplastic polyurethane rubber) and soft PVC (polyvinyl chloride).

[0043] The two ends of the connecting tube 4 are respectively sleeved on the connecting piece 14 and the flexible tail pipe 5, and the fixing method between the connecting piece 14 and the flexible tail pipe 5 can be bonding, mechanical fixing, etc., or a combination of several fixing methods. Optionally, an inclined tip can be provided on the surface of the connecting piece 14, and a corresponding pointed groove can be provided on the inner side wall of the connecting tube 4. The matching design of the inclined tip and the pointed groove, the use of the mechanical fixing method, and the combination of bonding and other methods can improve the connection strength between the connecting tube 4 and the connecting piece 14.

[0044] like Figure 2 As shown, the driving member 3 may specifically include a knob 31 and a rotating sleeve 32, wherein the knob 31 is sleeved on the rotating sleeve 32, and the proximal end of the knob 31 extends to the proximal end of the rotating sleeve 32, and the rotating sleeve 32 is threadedly connected with the screw 11, and the knob 31 drives the rotating sleeve 32 to rotate by rotating to drive the screw 11 to move along the axis. That is, in this embodiment, the driving member 3 adopts an inner and outer assembly structure, the outer knob 31 is used for applying force, and has a relatively large axial length, which can increase the convenience of operation, and the inner rotating sleeve 32 is used to drive the screw 11 to move and then drive the needle assembly 10 to move, and has a relatively small axial length, and the number of threads arranged on its surface can control the needle length of the needle assembly 10.

[0045] Further Figure 2 As shown, preferably, the outer wall of the connector 14 is provided with a stabilizing ring 15 along the circumferential direction, and the stabilizing ring 15 contacts the inner surface of the portion of the knob 31 extending out of the proximal end of the rotating sleeve 32, so as to provide support force for the knob 31 and provide low friction resistance for the movement of the knob 31. The provision of the stabilizing ring 15 plays a role in lubrication and support, enhancing the stability of the connector 14 structure and the overall operating experience of the catheter. The stabilizing ring 15 can be made of a variety of elastic or low friction materials such as polytetrafluoroethylene (PTFE), fluorinated ethylene propylene (FEP), rubber, silicone rubber, etc.

[0046] like Figures 2 to 4As shown, preferably, the internal component also includes a plurality of sections of low-friction short tubes 17, and the plurality of sections of the low-friction short tubes 17 are sequentially arranged along the extension direction of the connector 14, the flexible tail tube 5 and the integrated end shell 7, so as to allow the movable brine tube 9 to pass through. The low-friction short tube 17 can be made of a variety of low-friction or self-lubricating polymer materials such as polytetrafluoroethylene (PTFE) and fluorinated ethylene propylene (FEP). The use of a multi-section low-friction short tube 17 for the movable brine tube 9 to pass through can, on the one hand, reduce the friction resistance encountered by the movable brine tube 9 when it moves, and on the other hand, the multi-section separated structure can reduce the bending effect of the tube caused by the creep of the polymer material during long-term packaging and bending, so that the tail line structure of the catheter can quickly return to a straight state after the package is taken out.

[0047] Preferably, the connecting member 14 has three cavities that penetrate the connecting member 14 in the axial direction and are isolated from each other, and the proximal ends of the first hard tube, the second hard tube 12 and the third hard tube 13 extend into the connecting member 14 from different cavities. Figure 5 As shown, the three cavities are respectively a first cavity 100, a second cavity 200 and a third cavity 300, the line tube 16 is connected to the first hard tube in the first cavity 100, the fixed saline tube 8 is connected to the second hard tube 12 in the second cavity 200, and the movable saline tube is connected to the third hard tube 13 in the third cavity 300, wherein the axis of the connecting member 14 is located in the second cavity 200, so that the fixed saline tube 8 can drive the needle assembly 10 to move along the axis driven by the screw 11, and relative to the eccentric setting, when the needle assembly 10 moves along the axis, i.e., the center position, the needle assembly is not easy to bend.

[0048] Better, such as Figure 7As shown, the integrated end shell 7 has a first guide structure 701, a fixed limiting structure 702 and a second guide structure 703, wherein the first guide structure 701 and the second guide structure 703 are respectively used to guide the movable saline tube 9 and the fixed saline tube 8 to pass through different positions of the proximal end of the integrated end shell 7, and the fixed limiting structure 702 is used to fix the cable socket 18 so that the cable can be electrically connected to the cable socket 18 after passing through the proximal end of the line tube 16, wherein the first guide structure 701 and the second guide structure 703 are distributed on both sides of the fixed limiting structure 702. The low-friction short tube 17 in the integrated end shell 7 is arranged in the guide channel defined by the first guide structure 701, so that when the movable saline tube 9 passes through the low-friction short tube 17, its movement path is consistent with the guide path of the first guide structure 701.

[0049] Further preferably, the first guide structure 701 and the second guide structure 703 respectively include a plurality of guide portions arranged in sequence and at intervals along the length direction of the integrated end shell 7, and each of the guide portions has a guide hole. This design can improve the convenience of arranging the low-friction short tube 17 and the fixed brine tube 8 in the integrated end shell 7, and reduce the overall weight of the tail integrated structure, thereby further improving the operating experience.

[0050] In addition, better Figure 6 As shown, the integrated end shell 7 includes a first shell 71 and a second shell 72, the first shell 71 and the second shell 72 are transversely spliced ​​to form the integrated end shell 7, and the first guide structure 701, the fixed limit structure 702 and the second guide structure 703 are formed by transversely splicing the first shell 71 and the second shell 72. The integrated end shell 7 adopts a splicing structure, and the movable brine tube 9, the cable socket 18 and the fixed brine tube 8 can be positioned to the corresponding positions respectively, and then the first shell 71 and the second shell 72 are assembled together, so that the convenience of arranging the line tube 16, the fixed brine tube 8 and the movable brine tube 9 in the integrated end shell 7 can be improved.

[0051] The first shell 71 and the second shell 72 can be fixed by one or more of the structures themselves, medical grade adhesives or high frequency welding. For example, one of the first shells 71 can have a convex column and the other can have a groove, and the convex column is correspondingly inserted into the groove to achieve the splicing between the first shell 71 and the second shell 72. The matching arrangement of the convex column and the groove can reduce the difficulty of assembling the first shell 71 and the second shell 72, and increase the accuracy of assembling the first shell 71 and the second shell 72.

[0052] Better, such as Figure 1 As shown, the tail integrated structure further includes a cable anti-folding sleeve 6, and the integrated end shell 7 is connected to the proximal end of the connector 14 through the cable anti-folding sleeve 6. The cable anti-folding sleeve 6 is used to reduce the bending angle of the movable saline tube 9, the fixed saline tube 8 and the line tube 16 relative to the integrated end shell 7 when in use. The cable anti-folding sleeve 6 can be made of a variety of elastic materials such as rubber, silicone rubber and soft PVC.

[0053] In the tail integrated structure provided by the embodiment of the utility model, the various components can be connected in the following manner: the connector 14 is fixed to the screw 11 by a medical-grade adhesive, a certain amount of medical adhesive is coated on the outer surfaces of the second hard tube 12 and the first hard tube to be bonded and fixed to the fixed saline tube 8 and the line tube 16 respectively, and at the same time, a certain amount of medical adhesive is injected into the first cavity 100 and the second cavity 200 to assist in bonding. At this time, the line tube 16 and the fixed saline tube 8 etc. act as reinforcing ribs in the bonding structure of the connector 14 and the screw 11, further enhancing the structural strength. The screw 11 and the first hard tube, the second hard tube 12 and the connector 14, the first hard tube and the line tube 16, the second hard tube 12 and the fixed saline tube 8, the connector 14 and the connecting tube 4, the connecting tube 4 and the flexible tail tube 5, the flexible tail tube 5 and the cable anti-folding sleeve 6, the cable anti-folding sleeve 6 and the integrated end shell 7, and the fixed saline tube 8 and the integrated end shell 7 are all fixed by medical-grade adhesive. There is no fixing method between the third hard tube 13 and the screw 11, and the two can be relatively displaced. The cable socket 18 and the integrated end shell 7 are fixed by mechanical structure and medical-grade adhesive.

[0054] The medical catheter provided by the embodiment of the utility model has the following working principle: the knob 31 is rotated, and the knob 31 drives the rotating sleeve 32 to rotate, so as to drive the screw 11 to move along the axis toward or away from the handle 2, thereby driving all other components of the entire tail integrated structure except the active saline tube 9 to move relative to the handle 2. The active saline tube 9 does not undergo any relative displacement relative to the handle 2, so it can be understood that the "active" saline tube described in this application refers to a saline tube that is not fixed together with other components of the tail integrated structure. When other components move, the active saline tube 9 does not move therewith and remains relatively fixed with the handle 2.

[0055] In summary, the tail integrated structure and medical catheter provided by the embodiments of the utility model utilize the tail integrated structure to integrate two saline lines and a cable line together without affecting the activity function of one of the saline lines. In addition, the tail integrated structure increases the axial extension length of the catheter tail, which can reduce the transmission of the torsional effect, and not only solves the problem of rotation and entanglement of the tail line, but also improves the operator's operating experience.

[0056] The above description is only a description of the preferred embodiment of the utility model, and is not any limitation on the scope of the utility model. Any changes and modifications made by ordinary technicians in the field of the utility model based on the above disclosure shall fall within the scope of protection of the claims.

Claims

1. A tail integrated structure, It is characterized in that include: Drive components, screws, connectors, flexible tailpieces, integrated end shells and internal components; The screw, the connector, the flexible tail pipe and the integrated end shell are connected in sequence from the distal end to the proximal end; the driving member is threadedly connected to the screw and is rotatably arranged around an axis, and the driving member is used to drive the screw to move along the axis by rotation; The internal components include a fixed saline tube, a movable saline tube, a line tube, a first hard tube, a second hard tube and a third hard tube, wherein the first hard tube, the second hard tube and the third hard tube are respectively passed through the screw rod, and the proximal ends extend into the connecting piece respectively, wherein the first hard tube and the second hard tube are respectively fixedly connected to the screw rod, and the proximal ends are respectively connected to the fixed saline tube and the line tube, and the third hard tube is movably arranged relative to the screw rod, and the proximal end is connected to the movable saline tube; the fixed saline tube and the movable saline tube respectively extend from the connecting piece to pass through the proximal end of the integrated end shell, and the line tube extends from the connecting piece to the integrated end shell.

2. The tail integrated structure according to claim 1, It is characterized in that The internal component also includes a plurality of low-friction short tubes, which are sequentially arranged along the extension direction of the connector, the flexible tail pipe and the integrated end shell to allow the movable brine pipe to pass through.

3. The tail integrated structure according to claim 1, It is characterized in that The integrated end shell has a first guide structure, a second guide structure and a fixed limiting structure, the first guide structure and the second guide structure are respectively used to guide the movable saline tube and the fixed saline tube to pass through different positions at the proximal end of the integrated end shell, and the fixed limiting structure is used to fix the cable socket, wherein the first guide structure and the second guide structure are distributed on both sides of the fixed limiting structure.

4. The tail integrated structure as claimed in claim 3, It is characterized in that The first guide structure and the second guide structure respectively include a plurality of guide portions which are sequentially arranged at intervals along the length direction of the integrated end shell, and each of the guide portions has a guide hole.

5. The tail integrated structure as claimed in claim 3, It is characterized in that The integrated end shell includes a first shell and a second shell, the first shell and the second shell are transversely spliced ​​to form the integrated end shell, and the first guide structure, the second guide structure and the fixed limiting structure are formed by transversely splicing the first shell and the second shell.

6. The tail integrated structure as claimed in claim 5, It is characterized in that One of the first shell and the second shell has a convex column on its inner wall, and the other has a groove on its inner wall. The convex column is correspondingly inserted into the groove to achieve the splicing between the first shell and the second shell.

7. The tail integrated structure according to claim 1, It is characterized in that The tail integrated structure also includes a cable anti-folding sleeve, and the integrated end shell is connected to the proximal end of the flexible tail tube through the cable anti-folding sleeve. The cable anti-folding sleeve is used to reduce the bending angle of the movable brine tube, the fixed brine tube and the line tube relative to the integrated end shell when in use.

8. The tail integrated structure according to claim 1, It is characterized in that The driving component includes a knob and a rotating sleeve, the knob is sleeved on the rotating sleeve, and the proximal end of the knob extends to extend out of the proximal end of the rotating sleeve; the rotating sleeve is threadedly connected to the screw, and the knob drives the rotating sleeve to rotate by rotating to drive the screw to move along the axis.

9. The tail integrated structure according to claim 8, It is characterized in that The connecting piece and the flexible tail tube are connected by a connecting tube. The outer side wall of the connecting piece is provided with a stabilizing ring along the circumferential direction. The stabilizing ring contacts the inner surface of the portion of the knob extending out of the proximal end of the rotating sleeve to provide supporting force for the knob and low friction resistance for the movement of the knob.

10. The tail integrated structure according to claim 1, It is characterized in that The connecting member has three cavities which are axially penetrated and isolated from each other. The proximal ends of the first hard tube, the second hard tube and the third hard tube extend into the connecting member from different cavities, and the axis of the connecting member is located in the cavity into which the second hard tube extends.

11. A medical catheter, It is characterized in that include: A catheter body, a handle, a needle assembly and a tail integrated structure as described in any one of claims 1 to 10, wherein the drive member can be rotatably arranged at the proximal end of the handle, the needle assembly can be movably inserted through the handle and the catheter body in sequence, and the proximal end of the needle assembly is fixedly connected to the distal end of the second hard tube, and the second hard tube moves with the movement of the screw to drive the needle assembly to move, so that the distal end of the needle assembly can extend out of the distal end of the catheter body.

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