Interventional catheter limiting conveying auxiliary equipment

Abstract

The invention relates to the technical field of interventional catheters, in particular to interventional catheter limiting and conveying auxiliary equipment which comprises a catheter body and an operation portion and further comprises an outer tube, the outer tube is arranged at the end, away from the operation portion, of the outer side of the catheter body in a sleeving mode, and a rotating portion used for rotating and reversing is reserved at the front end of the catheter body; the multiple conveying auxiliary components are evenly arranged between the catheter body and the outer tube, each conveying auxiliary component comprises a magnetic block arranged on the outer wall of the catheter body, magnetic fluid matched with the magnetic blocks for use is arranged on the inner wall of the outer tube, and a rotating unit is arranged in the outer tube; according to the interventional catheter limiting conveying auxiliary equipment, when a doctor performs an operation, the rotating part of the catheter body is controlled by the conveying auxiliary component to turn in multiple directions, it is guaranteed that the rotating part of the catheter body smoothly enters a target blood vessel, and the situation that the rotating direction needs to be adjusted by rotating the catheter body is avoided.

Description

Technical Field

[0001] The present invention relates to the technical field of interventional catheters, and particularly to an interventional catheter limit conveying auxiliary device. Background Art

[0002] In the medical field, as an important medical device, interventional catheters are widely used in the diagnosis and treatment of cardiovascular, cerebrovascular, peripheral vascular and other diseases.

[0003] Most traditional interventional catheter designs can only rotate in two opposite directions in the same plane. This limitation is particularly inconvenient in the operation of complex vascular structures. During the operation, if the doctor needs to rotate the catheter in other directions, usually the interventional catheter itself needs to be directly rotated manually. This not only increases the operation difficulty, but also may lead to the instability of the catheter position, affecting the accuracy and safety of the operation. More critically, due to the limitation of the rotation direction of traditional interventional catheters, it is easy for the doctor to forget the direction of rotation after rotating the catheter. In this way, the catheter cannot reach the target blood vessel accurately at one time after the next rotation, thus affecting the operation duration. For this reason, we propose an interventional catheter limit conveying auxiliary device. Summary of the Invention

[0004] One technical problem to be solved by this application is: how to design an interventional catheter limit conveying auxiliary device that can rotate in multiple directions.

[0005] To solve the above technical problem, the embodiment of this application provides an interventional catheter limit conveying auxiliary device, including a catheter body and an operation part, and further including:

[0006] An outer tube, the outer tube is sleeved on the outer side of the catheter body away from the operation part, and a rotating part for rotating and changing direction is left at the front end of the catheter body;

[0007] A plurality of conveying auxiliary components, the plurality of conveying auxiliary components are evenly arranged between the catheter body and the outer tube, and are used to enable the doctor to control the rotating part of the catheter body to turn in multiple directions through the adjustment of the operation part, so as to ensure that the rotating part of the catheter body smoothly enters the target blood vessel;

[0008] The conveying auxiliary component includes a magnetic block arranged on the outer wall of the catheter body, a magnetic fluid matched with the magnetic block is arranged on the inner wall of the outer tube, a rotating unit is arranged in the outer tube, and is used to control the on-off of the adsorption force between the magnetic fluid and the magnetic block, so as to realize the turning of the rotating part of the catheter body in multiple directions. A synchronous limit unit matched with the rotating unit is arranged in the outer tube, and is used to limit the rotation angle of the rotating part.

[0009] In some embodiments, a medical bag is disposed inside the outer tube for storing magnetic fluid. The rotation unit includes a magnetic isolation member disposed inside the outer tube to block the magnetic fluid, such that normal adsorption between the magnetic fluid and the magnetic block cannot occur. A displacement member is disposed inside the outer tube. When a doctor adjusts the operation part, the magnetic isolation of the magnetic fluid by the magnetic isolation member can be cancelled to meet the turning requirement of the rotating part of the catheter body. A lifting member cooperating with the medical bag is disposed inside the outer tube to gradually fit and squeeze the medical bag when the displacement member works, thereby adjusting the rotation angle of the rotating part of the catheter body.

[0010] In some embodiments, the magnetic isolation member includes a magnetic isolation cover disposed inside the outer tube. A chute is formed on one side of the magnetic isolation cover close to the magnetic block, and a movable magnetic isolation plate is disposed inside the chute.

[0011] In some embodiments, the displacement member includes a lifting guide wire disposed on the operation part. The lifting guide wire is located inside the catheter body and is connected to the movable magnetic isolation plate. A displacement plate is slidably disposed inside the magnetic isolation cover. The medical bag is disposed on the displacement plate. A first elastic sheet is disposed inside the magnetic isolation cover, and two ends of the first elastic sheet are respectively connected to the magnetic isolation cover and the displacement plate.

[0012] In some embodiments, the lifting member includes wire ropes disposed on both sides of the displacement plate. Through grooves are respectively formed on both sides inside the magnetic isolation cover. A storage wire groove is formed on the movable magnetic isolation plate. The wire ropes sequentially pass through the adjacent through grooves and the storage wire groove and are connected to the movable magnetic isolation plate.

[0013] In some embodiments, the synchronous limiting unit includes a support frame disposed on the outer tube. An extrusion member cooperating with the movable magnetic isolation plate is disposed on the support frame to drive the extrusion member to work when the movable magnetic isolation plate is displaced. A limiting plate is disposed on the outer tube. An elastic pad is disposed between the limiting plate and the outer tube. A jacking member is disposed on the support frame to drive the jacking member to jack out the limiting plate when the extrusion member works. A connecting member is disposed on the support frame to cooperate with the extrusion member and the movable magnetic isolation plate to work.

[0014] In some embodiments, the extrusion member includes a fixed airbag disposed on the support frame, and a second elastic sheet is disposed inside the fixed airbag.

[0015] In some embodiments, the jacking member includes a jacking airbag disposed on the support frame, and the jacking airbag is connected to the fixed airbag through a hose.

[0016] In some embodiments, the connecting member includes a bent plate slidably disposed on the support frame. The top of the bent plate is in contact with the fixed airbag. A connecting plate is disposed on the movable magnetic isolation plate, and a third elastic sheet is disposed between the bent plate and the connecting plate.

[0017] In some embodiments, the cord is composed of a pulling section and an extending section. The pulling section is connected to the displacement plate, and the extending section is connected to the movable magnetic shielding plate. The diameter of the extending section is larger than that of the pulling section, and the extending section cannot be pulled out from the wire groove.

[0018] The present invention has at least the following beneficial effects:

[0019] 1. Multi-directional turning ability: By providing a plurality of conveying auxiliary components between the outer tube and the catheter body, doctors can easily adjust the rotating part of the catheter body using the operating part and turn in multiple directions. This greatly enhances the navigation ability of the catheter in complex vascular structures and improves the accuracy and success rate of the operation;

[0020] 2. Flexibility and controllability: The design of the magnetic shielding member and the displacement member in the rotating unit enables the adsorption force between the magnetic fluid and the magnetic block to be controlled to be turned on and off. Doctors can adjust the rotating state of the catheter at any time according to the surgical needs to achieve flexible and controllable catheter operation;

[0021] 3. Rotation angle limitation: The design of the synchronous limit unit ensures that the rotation angle of the rotating part of the catheter is accurately controlled. By cooperating with the rotating unit, doctors can preset and limit the rotation angle of the catheter to avoid the risks that may be brought by excessive rotation and ensure the safety and stability of the surgical process. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 is a schematic diagram of the overall structure of the present invention;

[0023] Figure 2 is of the present invention Figure 1 is a schematic diagram of the sectional structure;

[0024] Figure 3 is a schematic diagram of the rotating part of the catheter body and the outer tube structure of the present invention;

[0025] Figure 4 is of the present invention Figure 3 is a schematic diagram of the structure in another orientation;

[0026] Figure 5 is of the present invention Figure 3 is a schematic diagram of the sectional structure;

[0027] Figure 6 is of the present invention Figure 5 is an enlarged schematic diagram of area A in the present invention;

[0028] Figure 7 is of the present invention Figure 4 is a schematic diagram of the sectional structure;

[0029] Figure 8 is of the present invention Figure 7 is an enlarged schematic diagram of area B in the present invention;

[0030] Figure 9 Schematic diagram of the partial cross-section structure of the conveying auxiliary component of the present invention;

[0031] Figure 10 Schematic diagram of the structure of the synchronous limiting unit of the present invention;

[0032] Figure 11 Schematic diagram of the partial cross-section structure of the rotating unit of the present invention;

[0033] Figure 12 For the present invention Figure 11 Schematic diagram of the structure with the medical bag removed by sectioning;

[0034] Figure 13 Schematic diagram of the magnetic shielding cover structure in Embodiment 2 of the present invention;

[0035] Figure 14 For the present invention Figure 13 Schematic diagram of the partial cross-section structure.

[0036] In the figure: 1, catheter body; 2, operation part; 3, conveying auxiliary component; 31, magnetic block; 32, magnetic fluid; 4, rotating unit; 41, medical bag; 5, magnetic shielding part; 51, magnetic shielding cover; 52, sliding groove; 53, movable magnetic shielding plate; 6, shifting part; 61, lifting guide wire; 62, shifting plate; 63, first elastic piece; 7, lifting part; 71, wire rope; 72, wire passing groove; 73, wire storage groove; 8, synchronous limiting unit; 81, support frame; 82, limiting plate; 9, pressing part; 91, fixed airbag; 92, second elastic piece; 10, ejecting part; 101, ejecting airbag; 11, connecting part; 111, bent plate; 112, connecting plate; 113, third elastic piece; 12, outer tube; 13, pulling section; 14, extending section. Detailed implementation manners

[0037] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present invention.

[0038] Embodiment 1

[0039] Please refer to Figures 1 - 12 , the present invention provides a technical solution:

[0040] An interventional catheter limiting delivery auxiliary device, including a catheter body 1 and an operating part 2. The catheter body 1 and the operating part 2 are common existing structures. The rotating part at the front end of the catheter body 1 contains a memory material, which can automatically return to its original position after the adsorption between the magnetic block 31 and the magnetic fluid 32 is cancelled. The position of the catheter body 1 can be adjusted through the operating part 2, that is, the catheter body 1 can be inserted into the body or taken out of the body. It also includes:

[0041] An outer tube 12, which is sleeved on the outer side of the catheter body 1 away from the operating part 2, and a rotating part for rotating and changing directions is left at the front end of the catheter body 1. The size of the outer tube 12 is slightly larger than that of the catheter body 1, and it will not affect the insertion and extraction of the catheter body 1 from the body;

[0042] A plurality of delivery auxiliary components 3, which are evenly arranged between the catheter body 1 and the outer tube 12, are used to enable the doctor to control the rotation of the rotating part of the catheter body 1 in multiple directions through the adjustment of the operating part 2, and ensure that the rotating part of the catheter body 1 smoothly enters the target blood vessel. In this solution, the number of the delivery auxiliary components 3 is 8, but it is not limited and can be set according to the actual situation. Therefore, if the doctor needs to rotate in a certain direction, he can directly pull the lifting guide wire 61 in that direction, and the rotation angle is determined by the pulling distance of the lifting guide wire 61;

[0043] The delivery auxiliary component 3 includes a magnetic block 31 arranged on the outer wall of the catheter body 1, a magnetic fluid 32 matched with the magnetic block 31 is arranged on the inner wall of the outer tube 12, and a rotating unit 4 is arranged in the outer tube 12, which is used to control the on-off of the adsorption force between the magnetic fluid 32 and the magnetic block 31, so as to realize the turning of the rotating part of the catheter body 1 in multiple directions. A synchronous limiting unit 8 matched with the rotating unit 4 is arranged in the outer tube 12, which is used to limit the rotation angle of the rotating part;

[0044] A medical bag 41 is arranged in the outer tube 12 for storing the magnetic fluid 32. The rotating unit 4 includes a magnetic isolation part 5 arranged in the outer tube 12, which blocks the magnetic fluid 32, so that the magnetic fluid 32 and the magnetic block 31 cannot be normally adsorbed. A displacement part 6 is arranged in the outer tube 12, which can cancel the block of the magnetic isolation part 5 on the magnetic fluid 32 when the doctor adjusts the operating part 2, so as to realize the turning requirement of the rotating part of the catheter body 1. A lifting part 7 matched with the medical bag 41 is arranged in the outer tube 12, which is used to gradually fit and squeeze the medical bag 41 when the displacement part 6 works, so as to adjust the rotation angle of the rotating part of the catheter body 1. The medical bag 41 is made of PE material, which does not affect magnetism and can be normally squeezed by the displacement plate 62;

[0045] The magnetic isolation member 5 includes a magnetic isolation cover 51 disposed inside the outer tube 12. A chute 52 is formed on the side of the magnetic isolation cover 51 close to the magnetic block 31, and a movable magnetic isolation plate 53 is disposed in the chute 52.

[0046] The displacement member 6 includes a lifting guide wire 61 disposed on the operating portion 2. The lifting guide wire 61 is located inside the catheter body 1 and is connected to the movable magnetic isolation plate 53. A displacement plate 62 is slidably disposed inside the magnetic isolation cover 51. The medical bag 41 is disposed on the displacement plate 62. A first elastic piece 63 is disposed inside the magnetic isolation cover 51. Two ends of the first elastic piece 63 are respectively connected to the magnetic isolation cover 51 and the displacement plate 62. The setting of the lifting guide wire 61 is a common structure in the field of interventional catheters, and it is also a common treatment method to provide the lifting guide wire 61 to adjust the movement of the front end of the catheter body 1, so no more details will be described here.

[0047] The lifting member 7 includes wire ropes 71 disposed on both sides of the displacement plate 62. Through grooves 72 are respectively formed on both sides inside the magnetic isolation cover 51. A storage wire groove 73 is formed on the movable magnetic isolation plate 53. The wire ropes 71 sequentially pass through the adjacent through grooves 72 and the storage wire groove 73 and are connected to the movable magnetic isolation plate 53.

[0048] The synchronous limiting unit 8 includes a support frame 81 disposed on the outer tube 12. An extrusion member 9 that cooperates with the movable magnetic isolation plate 53 is disposed on the support frame 81, and is used to drive the extrusion member 9 to work when the movable magnetic isolation plate 53 is displaced. A limiting plate 82 is disposed on the outer tube 12. An elastic pad is disposed between the limiting plate 82 and the outer tube 12. A ejecting member 10 is disposed on the support frame 81, and is used to drive the ejecting member 10 to eject the limiting plate 82 when the extrusion member 9 works. A connecting member 11 is disposed on the support frame 81, and is used to cooperate with the extrusion member 9 and the movable magnetic isolation plate 53 to work.

[0049] The extrusion member 9 includes a fixed airbag 91 disposed on the support frame 81. A second elastic piece 92 is disposed inside the fixed airbag 91.

[0050] The ejecting member 10 includes an ejecting airbag 101 disposed on the support frame 81. The ejecting airbag 101 is connected to the fixed airbag 91 through a hose, and the ejecting airbag 101 is in contact with the limiting plate 82.

[0051] The connecting member 11 includes a bent plate 111 slidably disposed on the support frame 81. The top of the bent plate 111 is in contact with the fixed airbag 91. A connecting plate 112 is disposed on the movable magnetic isolation plate 53. A third elastic piece 113 is disposed between the bent plate 111 and the connecting plate 112. When the movable magnetic isolation plate 53 is displaced, it can directly drive the bent plate 111 to be displaced. The bent plate 111 squeezes the fixed airbag 91, so that the internal gas enters the ejecting airbag 101 through the hose, and then the limiting plate 82 is ejected.

[0052] In use, in the initial state, the catheter body 1 is sleeved by the outer tube 12, the magnetic block 31 and the magnetic fluid 32 are separated by the movable magnetic isolation plate 53 in the magnetic isolation cover 51, the magnetic fluid 32 in the medical bag 41 is in an uncompressed state, and the limiting plate 82 of the synchronous limiting unit 8 is not ejected; when the doctor adjusts the position of the catheter body 1 through the operating part 2 and needs to turn, the lifting guide wire 61 is pulled to drive the movable magnetic isolation plate 53 to move, canceling the barrier to the magnetic fluid 32. An adsorption force is generated between the magnetic fluid 32 and the magnetic block 31, and the doctor controls the turning of the rotating part of the catheter body 1 by adjusting the magnetic force direction through the operating part 2;

[0053] At the same time, after the movable magnetic isolation plate 53 moves a certain displacement, the displacement plate 62 is driven by the wire rope 71 to squeeze the medical bag 41, adjusting the distribution of the magnetic fluid 32 and affecting the rotation angle of the catheter body 1. The movement of the movable magnetic isolation plate 53 also drives the connecting plate 112 and the bending plate 111 to squeeze the fixed airbag 91, and the gas enters the ejecting airbag 101 through the hose, and the ejecting limiting plate 82 limits the rotation angle of the catheter body 1;

[0054] After the turning is completed, the lifting guide wire 61 is released, and components such as the movable magnetic isolation plate 53, the medical bag 41, and the bending plate 111 return to their original states under the action of elastic members (the first elastic piece 63, the second elastic piece 92, and the third elastic piece 113), and the rotating part of the catheter body 1 also automatically returns to its original position. The whole process realizes the precise control and angle limitation of the rotating part of the catheter body 1, improving the accuracy and safety of the operation.

[0055] Embodiment 2

[0056] Please refer to Figures 13 - 14 , the present invention provides a technical solution:

[0057] Different from Embodiment 1, the wire rope 71 is composed of a pulling section 13 and an extending section 14. The pulling section 13 is connected to the displacement plate 62, and the extending section 14 is connected to the movable magnetic isolation plate 53. The diameter of the extending section 14 is larger than that of the pulling section 13, and the extending section 14 cannot be pulled out from the wire groove 72. Designing the wire rope 71 to have a structure with one thick section (extending section 14) and one thin section (pulling section 13) can ensure that when the movable magnetic isolation plate 53 initially moves, the displacement plate 62 will not be pulled up, and thus the displacement plate 62 will not squeeze the medical bag 41. At this time, the adsorption force between the magnetic block 31 and the magnetic fluid 32 is small, and the rotation angle of the rotating part of the catheter body 1 is also small. After squeezing and pulling the movable magnetic isolation plate 53, the pulling section 13 enters the storage wire groove 73, the displacement plate 62 moves up, and starts to squeeze the medical bag 41. At this time, the adsorption force between the magnetic block 31 and the magnetic fluid 32 is large, and the rotation angle of the rotating part of the catheter body 1 is also large;

[0058] In use, in the initial state, the catheter body 1 is sleeved by the outer tube 12, the magnetic block 31 and the magnetic fluid 32 are separated by the movable magnetic separation plate 53 in the magnetic separation cover 51, the magnetic fluid 32 in the medical bag 41 is in an uncompressed state, and the limiting plate 82 of the synchronous limiting unit 8 is not ejected; when the doctor adjusts the position of the catheter body 1 through the operating part 2 and needs to turn, the lifting guide wire 61 is pulled to drive the movable magnetic separation plate 53 to move, canceling the blockage of the magnetic fluid 32. An adsorption force is generated between the magnetic fluid 32 and the magnetic block 31, and the doctor controls the turning of the rotating part of the catheter body 1 by adjusting the magnetic force direction through the operating part 2;

[0059] At the same time, after the movable magnetic separation plate 53 moves a certain displacement, the extended section 14 of the wire rope 71 is straightened, and the pulling section 13 enters the storage groove 73. The displacement plate 62 is driven by the wire rope 71 to squeeze the medical bag 41, adjusting the distribution of the magnetic fluid 32 and affecting the rotation angle of the catheter body 1. The movement of the movable magnetic separation plate 53 also drives the connecting plate 112 and the bending plate 111 to squeeze the fixed airbag 91, and the gas enters the ejecting airbag 101 through the hose, and the ejecting limiting plate 82 limits the rotation angle of the catheter body 1;

[0060] After the turning is completed, the lifting guide wire 61 is released, and components such as the movable magnetic separation plate 53, the medical bag 41, and the bending plate 111 return to their original states under the action of the elastic members (the first elastic piece 63, the second elastic piece 92, and the third elastic piece 113). The rotating part of the catheter body 1 also automatically returns to its original position. However, because the extended section 14 is relatively thick and cannot be pulled out of the wire groove 72, the extended section 14 still remains in the storage groove 73 for the next use. The whole process realizes the precise control and angle limitation of the rotating part of the catheter body 1, improving the accuracy and safety of the operation.

[0061] It should be noted that in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not expressly listed, or also includes elements inherent to such process, method, article or device.

[0062] Although the embodiments of the present invention have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principle and spirit of the present invention.

Claims

1. An interventional catheter position limiting delivery auxiliary device, comprising a catheter body (1) and an operating part (2), characterized in that: Also included are: An outer tube (12), the outer tube (12) being sleeved on an end of the outer side of the catheter body (1) away from the operating part (2), and a rotating part for rotating and reversing is reserved at the front end of the catheter body (1); A plurality of delivery auxiliary components (3), wherein the plurality of delivery auxiliary components (3) are evenly arranged between the catheter body (1) and the outer tube (12), and are used to enable a doctor to control the rotating part of the catheter body (1) to turn in multiple directions through adjustment of the operating part (2), thereby ensuring that the rotating part of the catheter body (1) smoothly enters the target blood vessel; The transport auxiliary component (3) comprises a magnetic block (31) arranged on the outer wall of the catheter body (1); a magnetic fluid (32) used in conjunction with the magnetic block (31) is arranged on the inner wall of the outer tube (12); a rotating unit (4) is arranged in the outer tube (12) for controlling the on and off of the adsorption force between the magnetic fluid (32) and the magnetic block (31), thereby realizing the turning of the rotating part of the catheter body (1) in multiple directions; and a synchronous limiting unit (8) used in conjunction with the rotating unit (4) is arranged in the outer tube (12) for limiting the rotation angle of the rotating part.

2. The interventional catheter position limiting delivery auxiliary device according to claim 1, characterized in that: A medical bag (41) is arranged inside the outer tube (12) for storing the magnetic fluid (32). The rotating unit (4) includes a magnetic isolation member (5) arranged inside the outer tube (12) for isolating the magnetic fluid (32) so that the magnetic fluid (32) and the magnetic block (31) cannot be normally adsorbed. A displacement member (6) is arranged inside the outer tube (12). When the doctor adjusts the operating part (2), the magnetic isolation member (5) can eliminate the barrier of the magnetic fluid (32) and realize the turning requirement of the rotating part of the catheter body (1). A lifting member (7) matched with the medical bag (41) is arranged inside the outer tube (12) for gradually fitting and squeezing the medical bag (41) when the displacement member (6) is working, thereby adjusting the rotation angle of the rotating part of the catheter body (1).

3. The interventional catheter position limiting delivery auxiliary device according to claim 2, characterized in that: The magnetic shielding member (5) comprises a magnetic shielding cover (51) arranged in the outer tube (12); a slide groove (52) is provided on the side of the magnetic shielding cover (51) close to the magnetic block (31); and a movable magnetic shielding plate (53) is provided in the slide groove (52).

4. The interventional catheter position limiting delivery auxiliary device according to claim 3, characterized in that: The displacement member (6) includes a lifting guide wire (61) arranged on the operating part (2), the lifting guide wire (61) is located inside the catheter body (1) and connected to the movable magnetic shielding plate (53), a displacement plate (62) is slidably arranged inside the magnetic shielding cover (51), the medical bag (41) is arranged on the displacement plate (62), and a spring piece (63) is arranged inside the magnetic shielding cover (51), and the two ends of the spring piece (63) are respectively connected to the magnetic shielding cover (51) and the displacement plate (62).

5. The interventional catheter position limiting delivery auxiliary device according to claim 4, characterized in that: The lifting member (7) comprises a wire rope (71) arranged on both sides of the shift plate (62), wire passing grooves (72) are respectively provided on both sides of the interior of the magnetic isolation cover (51), and a wire storage groove (73) is provided on the movable magnetic isolation plate (53), and the wire rope (71) passes through adjacent wire passing grooves (72) and wire storage grooves (73) in sequence and is connected to the movable magnetic isolation plate (53).

6. The interventional catheter position limiting delivery auxiliary device according to claim 5, characterized in that: The synchronous limiting unit (8) comprises a support frame (81) arranged on the outer tube (12); an extrusion piece (9) matched with the movable magnetic isolation plate (53) is arranged on the support frame (81) for driving the extrusion piece (9) to work when the movable magnetic isolation plate (53) is displaced; a limiting plate (82) is arranged on the outer tube (12); an elastic pad is arranged between the limiting plate (82) and the outer tube (12); an ejection piece (10) is arranged on the support frame (81) for driving the ejection piece (10) to eject the limiting plate (82) when the extrusion piece (9) is working; and a connecting piece (11) is arranged on the support frame (81) for cooperating with the extrusion piece (9) and the movable magnetic isolation plate (53) to work.

7. The interventional catheter position limiting delivery auxiliary device according to claim 6, characterized in that: The extrusion member (9) comprises a fixed airbag (91) arranged on a support frame (81), and a second spring piece (92) is arranged in the fixed airbag (91).

8. The interventional catheter position limiting delivery auxiliary device according to claim 7, characterized in that: The ejector (10) comprises an ejector airbag (101) arranged on a support frame (81), and the ejector airbag (101) and a fixed airbag (91) are connected via a hose.

9. The interventional catheter position limiting delivery auxiliary device according to claim 8, characterized in that: The connecting member (11) comprises a bent plate (111) slidably arranged on a support frame (81), the top of the bent plate (111) being in contact with a fixed airbag (91), a connecting plate (112) being arranged on the movable magnetic isolation plate (53), and a spring sheet (113) being arranged between the bent plate (111) and the connecting plate (112).

10. The interventional catheter position limiting delivery auxiliary device according to claim 5, characterized in that: The wire rope (71) is composed of a pulling section (13) and a delay section (14); the pulling section (13) is connected to the shift plate (62); the delay section (14) is connected to the movable magnetic isolation plate (53); the diameter of the delay section (14) is larger than the diameter of the pulling section (13), and the delay section (14) cannot be pulled out of the wire groove (72).

Images