CN113057772A

CN113057772A - Stent system

Info

Publication number: CN113057772A
Application number: CN202110491263.7A
Authority: CN
Inventors: 于波; 赵铁力; 候静波; 贾海波; 赵晨
Original assignee: Hengyi Beijing Medical Technology Co ltd; Harbin Medical University
Current assignee: Hengyi Beijing Medical Technology Co ltd; Harbin Medical University
Priority date: 2021-05-06
Filing date: 2021-05-06
Publication date: 2021-07-02
Anticipated expiration: 2041-05-06
Also published as: CN113057772B

Abstract

A stent system includes a stent body switchable between a contracted state and an expanded state; and the actuating mechanism comprises a catheter and two driving pieces, the catheter is used for penetrating through the stent main body, the two driving pieces are connected with the catheter, at least one of the two driving pieces can slide relative to the catheter along the extension direction of the catheter, so that the stent main body in an unfolded state is driven to move when the two driving pieces are relatively far away from the catheter, the near end and the far end of the stent main body are far away from each other, and the diameter of the stent main body is reduced. Can take out the support main part from the blood vessel, reduce the influence of support main part to the patient, improve the operation success rate.

Description

Stent system

Technical Field

The invention relates to the field of medical equipment, in particular to a bracket system.

Background

At present, the drug stent is an important tool for resisting coronary thrombosis. The stent is implanted into a thrombus site in the body of a patient, and the thrombus is eliminated and the regeneration is controlled by the slow release of the drug. However, there is a certain risk in this procedure, and the stent remains in the human body for a long time and is completely endothelialized after 3-6 months. Blood contacts the stent before the complete endothelialization of the stent, and complications are easily caused, so that certain risks exist, and the recovery of patients is not facilitated.

The inventor researches and discovers that the existing drug stent has the following defects:

stay in the body of the patient for a long time, and are not beneficial to the recovery of the patient.

Disclosure of Invention

The invention aims to provide a bracket system which can take out a bracket so as to improve the problem that the bracket stays in a patient body for a long time to influence the rehabilitation of the patient.

The embodiment of the invention is realized by the following steps:

the present invention provides a stent system comprising:

a stent main body switchable between a contracted state and an expanded state;

and the actuating mechanism comprises a catheter and two driving pieces, the catheter is used for penetrating through the stent main body, the two driving pieces are connected with the catheter, at least one of the two driving pieces can slide relative to the catheter along the extension direction of the catheter, so that the stent main body in an unfolded state is driven to move when the two driving pieces are relatively far away from the catheter, the near end and the far end of the stent main body are far away from each other, and the diameter of the stent main body is reduced.

In an optional embodiment, the stent main body comprises a first annular abutting part, an annular supporting part and a second annular abutting part which are sequentially connected and are all of a grid-shaped structure, and when the stent main body is in an unfolded state, the inner diameter of the first annular abutting part is gradually increased in the direction from the first annular abutting part to the second annular abutting part; the inner diameter of the second annular abutting part is gradually reduced in the direction from the first annular abutting part to the second annular abutting part;

the two driving pieces can be respectively abutted against the inner walls of the first annular abutting part and the second annular abutting part to drive the near end and the far end of the stent main body in the unfolding state to be away from each other so as to reduce the diameter of the stent main body.

In an optional embodiment, the driving member includes a first side surface and a second side surface which are sequentially connected in the extending direction of the guide tube, the two first side surfaces of the two driving members are located between the two second side surfaces, the second side surfaces are arranged to be concave surfaces, the intersecting line of the first side surface and the second side surface is an annular abutting portion, and the two annular abutting portions are used for abutting against the first annular abutting portion and the second annular abutting portion respectively.

In an optional embodiment, the actuator further includes two limiting members, the two limiting members are respectively connected to the two driving members, the two limiting members are both located between the two driving members, and the two limiting members are configured to abut against the two driving members when the two driving members are away from each other, so as to limit a maximum distance between the two driving members.

In an optional embodiment, the two driving members and the two limiting members are both slidably connected to the conduit, a first limiting member of the two limiting members is connected to a first driving member of the two driving members through a first connecting rod, a second limiting member of the two limiting members is connected to a second driving member of the two driving members through a second connecting rod, and the first driving member, the second limiting member, the first limiting member, and the second driving member are sequentially arranged in the extending direction of the conduit.

In an optional embodiment, the driving member and the limiting member are both sleeved outside the conduit.

In an alternative embodiment, the drive member is provided as an inflatable body.

In an alternative embodiment, the actuator further comprises a pair of electromagnets, and the pair of electromagnets are respectively connected with the two driving members and used for generating repulsive force when being electrified so as to drive the two driving members to move away from each other.

In an alternative embodiment, the actuator further comprises a transmission tube in sliding fit with the guide tube, the transmission tube being connected to one of the two driving members for driving the corresponding driving member closer to or farther from the other driving member.

In an alternative embodiment, the catheter is provided with a visualization member for determining the position of the catheter.

The embodiment of the invention has the beneficial effects that:

in summary, the present embodiment provides a stent system, after the stent main body is implanted into the thrombus position to be treated in the patient, the stent main body is in an expanded state, and the stent main body is supported on the blood vessel wall. After the drug on the stent main body is released, the actuating mechanism is conveyed into the body of a patient, so that the two driving pieces are both positioned in the stent main body, at the moment, operating the actuating mechanism to move at least one of the two driving members, wherein the two driving members are far away from each other and are both abutted against the bracket main body, thereby driving the near end and the far end of the stent main body to be far away from each other, namely the stent main body is stretched, therefore, the stent main body is contracted inwards along the radial direction, the diameter of the stent main body is reduced, the stent main body is separated from the vessel wall, the diameter of the stent main body is smaller than that of the vessel, the stent main body is not contacted with the vessel wall, thereby can draw when leaving the blood vessel through the pipe and drive the motion of support main part in order to take out the support main part from the blood vessel, avoid the support main part to stop in the internal recovery that influences the patient of patient for a long time, do benefit to patient's recovery, improve the success rate of operation.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.

FIG. 1 is a schematic structural view (expanded state) of a stent body according to an embodiment of the present invention;

FIG. 2 is a schematic structural diagram of an actuator according to an embodiment of the present invention;

FIG. 3 is a schematic view of a structure of an actuator cooperating with a holder body according to an embodiment of the present invention;

fig. 4 is a partial structural diagram of an execution structure according to an embodiment of the present invention.

Icon:

100-a stent body; 110-a first annular abutment; 120-an annular support; 130-a second annular abutment; 140-mesh; 200-an actuator; 210-a catheter; 220-a first drive member; 221-a first side; 222-a second side; 223-an annular abutment; 230-a second driver; 240-an electromagnetic drive unit; 241-a first electromagnet; 242-a second electromagnet; 250-a first stop; 251-a first connecting rod; 260-a second stop; 261-a second connecting rod; 270-a gas-filled tube; 300-a developing member; 400-handle.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings or the orientations or positional relationships that the products of the present invention are conventionally placed in use, and are only used for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," "third," and the like are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance.

Furthermore, the terms "horizontal", "vertical" and the like do not imply that the components are required to be absolutely horizontal or pendant, but rather may be slightly inclined. For example, "horizontal" merely means that the direction is more horizontal than "vertical" and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.

In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

Referring to fig. 1 to 4, the present embodiment provides a stent system, which can take out a stent from a blood vessel after a drug on the stent is absorbed by a tissue, so that the stent does not stay in a patient for a long time, thereby improving the influence of the long-term retention of the stent on the patient, facilitating the recovery of the patient, and increasing the success rate of the operation.

In this embodiment, the rack system includes:

a stent main body 100 capable of switching between a contracted state and an expanded state;

and the actuating mechanism 200, the actuating mechanism 200 includes a catheter 210 and two driving members, the catheter 210 is used for being inserted into the stent main body 100, the two driving members are both connected with the catheter 210, at least one of the two driving members can slide along the extending direction of the catheter 210 relative to the catheter 210, so as to drive the stent main body 100 in the unfolding state to move when the two driving members are relatively far away, so that the near end and the far end of the stent main body 100 are far away from each other, and the diameter of the stent main body 100 is reduced.

For convenience of description, the two driving members may be a first driving member 220 and a second driving member 230, respectively.

In the stent system provided in the present embodiment, after the stent main body 100 is implanted into a thrombus site to be treated in a patient, the stent main body 100 is in an expanded state, and the stent main body 100 is supported on a blood vessel wall. After the drug on the stent main body 100 is released, the actuator 200 is conveyed into the patient, so that the two driving members are both located inside the stent main body 100, at this time, the actuator 200 is operated to move at least one of the two driving members, the two driving members are away from each other, and both the two driving members are abutted against the stent main body 100, so as to drive the proximal end and the distal end of the stent main body 100 to be away from each other, that is, the stent main body 100 is stretched, so that the stent main body 100 is contracted inwards in the radial direction, the diameter of the stent main body 100 is reduced, the stent main body 100 is separated from the vessel wall, the diameter of the stent main body 100 is smaller than the diameter of the vessel, the stent main body 100 is not contacted with the vessel wall, so that the stent main body 100 is driven to move to be taken out of the vessel when the catheter 210 is withdrawn from the vessel, the complication is not easy to occur, the rehabilitation of the patient is facilitated, and the success rate of the operation is improved.

In this embodiment, optionally, the stent main body 100 includes a first annular abutting portion 110, an annular supporting portion 120, and a second annular abutting portion 130, which are connected in sequence and are all in a grid structure, and when the stent main body 100 is in the expanded state, the inner diameter of the first annular abutting portion 110 gradually increases in a direction from the first annular abutting portion 110 to the second annular abutting portion 130; the inner diameter of the second annular abutting portion 130 gradually decreases in a direction from the first annular abutting portion 110 toward the second annular abutting portion 130. That is, when the stent body 100 is in the unfolded state, the first annular abutting portion 110 and the second annular abutting portion 130 are both truncated cone-shaped, and the annular supporting portion 120 is cylindrical.

Further, the mesh holes 140 of the stent main body 100 are arranged as diamond-shaped holes, which are easily deformed, thereby facilitating the switching of the stent main body 100 between the contracted state and the expanded state. Obviously, in other embodiments, the mesh 140 on the stent body 100 may also be other shapes.

It should be understood that the stent main body 100 is formed by weaving an alloy, and the stent main body 100 has an integrated structure, is convenient to process and manufacture, has high structural strength and long service life, and has good deformability.

Further, the first annular abutting portion 110 and the second annular abutting portion 130 of the stent main body 100 are respectively used for abutting against two driving members, and therefore, the density of the meshes 140 on the first annular abutting portion 110 and the second annular abutting portion 130 is smaller than that of the meshes 140 on the annular supporting portion 120, that is, the ratio of the area of the openings on the first annular abutting portion 110 to the total surface area of the first annular abutting portion 110 is smaller than the ratio of the area of the openings on the annular supporting portion 120 to the total surface area of the annular supporting portion 120; the ratio of the opening area of the second annular abutting portion 130 to the total surface area of the second annular abutting portion 130 is smaller than the ratio of the opening area of the annular supporting portion 120 to the total surface area of the annular supporting portion 120, the structural strength of the first annular abutting portion 110 and the second annular abutting portion 130 is higher, and the stent is not easy to evert when abutted against a driving member, so that the accident rate is reduced, and the success rate of the stent taking-out operation is improved.

It should be understood that the stent body 100 may be of a self-expandable structure, i.e., the stent body 100 is in a contracted state, is located in a tube, and is released from the tube when it is desired to be implanted in a blood vessel of a patient, and the stent body 100 automatically expands to be supported on the blood vessel wall after losing a binding force; alternatively, in other embodiments, the stent body 100 is passively deployed using a balloon, i.e., the balloon is located inside the stent body 100 and, when the stent body 100 is delivered to the site to be released, the balloon is inflated and the balloon is inflated to deploy the stent body 100. Specifically, when utilizing the sacculus to strut support body 100, the sacculus is located the inside of support body 100 that is the contraction state, and the both ends of sacculus are near-end and the distal end that stretches out support body 100, equipment such as cooperation endoscope carry sacculus and support to the blood vessel together and treat treatment position department, then, utilize aeration equipment to inflate for the sacculus, sacculus inflation drives support main part 100 and opens, and sacculus inflation accomplishes the back, the sacculus is the little structure in big both ends in the middle of being, with the shape matching of support main part 100 after opening, in other words, the degree of the middle part inflation of sacculus is greater than the inflation degree at the both ends of sacculus, so, can make support body 100 be the little structure in big both ends in the middle of being when opening the state. After the stent main body 100 is opened, the balloon is deflated, the balloon is contracted, the balloon and the pipeline system are taken out of the blood vessel, and the stent main body 100 is supported in the blood vessel wall to play a role in treatment.

The deployment mode of the stent main body 100 may be selected as needed, and the balloon is used for deployment in the present embodiment.

In this embodiment, optionally, the actuator 200 further includes an electromagnetic driving unit 240, and the electromagnetic driving unit 240 includes a pair of electromagnets, for convenience of description, the pair of electromagnets are a first electromagnet 241 and a second electromagnet 242, respectively, the first electromagnet 241 and the second electromagnet 242 are both annular members, the first electromagnet 241 and the second electromagnet 242 are both sleeved outside the conduit 210, and the first electromagnet 241 and the second electromagnet 242 are configured to drive the first driving member 220 and the second driving member 230 to move. That is, the first electromagnet 241 and the second electromagnet 242 can be coupled when being electrified, and after being electrified, the first electromagnet 241 and the second electromagnet 242 can generate opposite magnetic poles, and the two magnets attract each other; alternatively, when energized, the first electromagnet 241 and the second electromagnet 242 can generate like magnetic poles, and they repel each other. In other words, when it is required to contract the stent body 100 in the expanded state, both the first driving member 220 and the second driving member 230 are placed in the stent body 100, the electromagnetic driving unit 240 is powered on, and the first electromagnet 241 and the second electromagnet 242 generate corresponding magnetic forces as required, which are far away from or close to each other, the first driving member 220 and the second driving member 230 are driven to move away from each other, the first driving member 220 and the second driving member 230 respectively abut against the inner wall of the first annular abutting portion 110 and the inner wall of the second annular abutting portion 130, and finally the proximal end and the distal end of the stent main body 100 are moved away from each other, the stent main body 100 contracts radially and inwardly while being elongated, the diameter of the stent main body 100 is reduced, and importantly, the outer diameter of the annular supporting portion 120 is reduced, the stent main body 100 is separated from the blood vessel wall, and the diameter of the stent main body 100 is smaller than that of the blood vessel, so that the stent main body 100 can be taken out of the blood.

It should be understood that in order to facilitate the switching of the stent main body 100 from the expanded state to the contracted state, the stent main body 100 is configured as a passive expansion structure, that is, the stent main body 100 does not generate an expansion force by itself, so that the influence of the limitation of the stent main body 100 to the contraction due to the expansion force of the stent main body 100 by itself is reduced, and the stent main body 100 is convenient to switch from the expanded state to the contracted state by the driving of the driving member. The contracted state of the stent body 100 does not necessarily mean a state in which the stent body 100 is contracted to the smallest diameter, and the diameter of the stent body 100 in the contracted state is smaller than that in the expanded state. Further, the diameter of the stent main body 100 is reduced by the driving of the driving member, and it is not necessarily to directly switch to the contracted state by the driving of the driving member, and as long as the stent main body 100 is switched from the expanded state to the contracted state, and the diameter of the stent main body 100 is reduced, the stent main body can be separated from the blood vessel wall, even if the stent main body 100 is taken out from the blood vessel.

In other embodiments, the two drivers may also be driven by other structures, such as a cable, a transmission tube, etc. connected to the first driver 220 and the second driver 230, respectively.

Optionally, the driving member is configured as an inflation member, the driving member is provided with an inflation port, the inflation port is communicated with an inflation tube 270, and the inflation tube 270 is located in the conduit 210 and can slide relative to the conduit 210. It should be understood that the two driving members may be in communication with each other using two inflation tubes 270. Meanwhile, a through hole avoiding the inflation tube 270 is formed in the tube wall of the duct 210, and the through hole is a strip-shaped hole and is in a strip shape along the extending direction of the duct 210. So, during the gas tube 270 worn to locate the bar hole, when the driving piece was kept away from each other, gas tube 270 can be in the corresponding slip in the bar hole.

Further, the inflation inlet of each inflation tube 270 can be a plurality of, and a plurality of inflation inlets that communicate with the same driving piece are evenly arranged at intervals in the circumference of inflation tube 270, so, improve the inflation efficiency, and improve stability. Correspondingly, a plurality of strip-shaped holes avoiding a plurality of inflation openings of the inflation tube 270 are formed in the tube wall of the duct 210.

Further, after the driving member is inflated, the driving member is of a revolving body structure, each driving member includes a first side surface 221 and a second side surface 222 which are sequentially connected in the extending direction of the conduit 210, the first side surface 221 of the first driving member 220 and the first side surface 221 of the second driving member 230 are located between the second side surface 222 of the first driving member 220 and the second side surface 222 of the second driving member 230, each second side surface 222 is set to be a concave surface, each first side surface 221 is set to be an convex surface, the intersection line of the first side surface 221 and the second side surface 222 is an annular abutting portion 223, and the two annular abutting portions 223 are used for abutting against the first annular abutting portion 110 and the second annular abutting portion 130 respectively. The driving member is arranged in front of the stent main body 100, the driving member is in an uninflated state, at this time, the driving member has a small volume, and can pass through the near end or the far end of the stent main body 100 and be located inside the stent main body 100, then, the first driving member 220 and the second driving member 230 are inflated by using an inflation device, the two driving members are expanded, so that the diameter of the annular abutting portion 223 is larger than the diameter of the port of the first annular abutting portion 110 and the port of the second annular abutting portion 130, the annular abutting portions 223 of the first driving member 220 and the second driving member 230 can be abutted against the inner walls of the first annular abutting portion 110 and the second annular abutting portion 130 respectively, and the abutting position is an annular position, when the first driving member 220 and the second driving member 230 are far away, the first annular abutting portion 110 and the second annular abutting portion 130 can be driven to be far away from.

Moreover, after the first driving member 220 and the second driving member 230 are inflated, the first driving member 220 and the second driving member 230 are both arc-shaped structures, so that the structure is stable, the deformation is not easy to occur, the force is favorably applied to the bracket main body 100, and the bracket main body 100 is driven to deform.

Optionally, the actuator 200 further includes two limiting members and two connecting rods, for convenience of description, the two limiting members are a first limiting member 250 and a second limiting member 260 respectively, and the two connecting rods are a first connecting rod 251 and a second connecting rod 261 respectively. The first limiting member 250 and the second limiting member 260 are ring-shaped members, both of which are sleeved outside the guide tube 210, the first limiting member 250 is connected to the first driving member 220 through a first connecting rod 251, the second limiting member 260 is connected to the second driving member 230 through a second connecting rod 261, and the first driving member 220, the second limiting member 260, the first limiting member 250 and the second driving member 230 are sequentially arranged in the extending direction of the guide tube 210. The first electromagnet 241 and the second electromagnet 242 are respectively connected to the first limiting member 250 and the second limiting member 260, and the first electromagnet 241 and the second electromagnet 242 are located between the first limiting member 250 and the second limiting member 260. When the electromagnetic driving mechanism is powered on and the first electromagnet 241 and the second electromagnet 242 generate opposite magnetic poles, the two are close to each other, the first limiting member 250 and the second limiting member 260 are close to each other, the first driving member 220 and the second driving member 230 are far away from each other, so that the proximal end and the distal end of the stent main body 100 can be driven to be far away, and the diameter of the stent main body 100 can be reduced. In addition, since the first limiting member 250 and the second limiting member 260 are close to each other and can abut against each other in the process of closing, the maximum distance between the first driving member 220 and the second driving member 230 is limited, so that the stent body 100 is stabilized in a state of reduced diameter, and the stent body 100 can be conveniently taken out subsequently. Meanwhile, both ends of the stent main body 100 are of a tapered structure, which is beneficial to the stent main body 100 to advance in a blood vessel. In the withdrawing operation, the catheter 210 and the inflation tube 270 are withdrawn together from the blood vessel, thereby withdrawing the stent body 100.

In this embodiment, optionally, a handle 400 may be disposed at the tail end of the catheter 210, and an on-off key for controlling the on-off of the electromagnetic driving unit 240 may be disposed on the handle 400.

In this embodiment, optionally, a developing unit 300 is disposed at the front end of the catheter 210, so as to facilitate observation of the position of the front end of the catheter 210 and the position of the driving unit disposed at the front end of the catheter 210.

In the present embodiment, the first driving member 220 and the second driving member 230 can be moved away from or close to each other at the same time, and obviously, in other embodiments, one of the first driving member 220 and the second driving member 230 may be provided as a moving member, and the other one may be kept fixed.

The stent system provided by the embodiment can take the stent main body 100 out of the blood vessel, reduce the influence of the stent main body 100 on a patient and improve the success rate of the operation.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A mounting system, comprising:

a stent main body switchable between a contracted state and an expanded state;

and the actuating mechanism comprises a catheter and two driving pieces, the catheter is used for penetrating through the stent main body, the two driving pieces are connected with the catheter, at least one of the two driving pieces can slide relative to the catheter along the extension direction of the catheter, so that the stent main body in the unfolded state is driven to move when the two driving pieces are relatively far away, the near end and the far end of the stent main body are far away from each other, and the diameter of the stent main body is reduced.

2. The mounting system of claim 1, wherein:

the bracket main body comprises a first annular abutting part, an annular supporting part and a second annular abutting part which are sequentially connected and are of a grid-shaped structure; when the stent main body is in the unfolded state, the inner diameter of the first annular abutting part is gradually increased in the direction from the first annular abutting part to the second annular abutting part; the inner diameter of the second annular abutting part is gradually reduced in the direction from the first annular abutting part to the second annular abutting part;

3. The mounting system of claim 2, wherein:

the driving pieces comprise a first side face and a second side face which are sequentially connected in the extending direction of the guide pipe, the two first side faces of the two driving pieces are located between the two second side faces, the second side faces are arranged to be concave faces, the intersection line of the first side faces and the second side faces is an annular abutting portion, and the two annular abutting portions are used for abutting against the first annular abutting portion and the second annular abutting portion respectively.

4. The mounting system of claim 3, wherein:

the actuating mechanism further comprises two limiting parts, the two limiting parts are respectively connected with the two driving parts, the two limiting parts are located between the two driving parts, and the two limiting parts are used for abutting when the two driving parts are far away from each other so as to limit the maximum distance between the two driving parts.

5. The mounting system of claim 4, wherein:

the two driving pieces and the two limiting pieces are both connected with the conduit in a sliding manner, a first limiting piece of the two limiting pieces is connected with a first driving piece of the two driving pieces through a first connecting rod, a second limiting piece of the two limiting pieces is connected with a second driving piece of the two driving pieces through a second connecting rod, and the first driving piece, the second limiting piece, the first limiting piece and the second driving piece are sequentially arranged in the extending direction of the conduit.

6. The mounting system of claim 5, wherein:

the driving piece and the limiting piece are sleeved outside the conduit.

7. The mounting system of any of claims 1-6, wherein:

the drive member is provided as an inflatable body.

8. The mounting system of claim 1, wherein:

the actuating mechanism further comprises a pair of electromagnets, and the pair of electromagnets are respectively connected with the two driving parts and used for generating repulsive force when being electrified so as to drive the two driving parts to be away from each other.

9. The mounting system of claim 1, wherein:

the actuating mechanism further comprises a transmission pipe, the transmission pipe is in sliding fit with the guide pipe, and the transmission pipe is connected with one of the two driving pieces and used for driving the corresponding driving piece to be close to or far away from the other driving piece.

10. The mounting system of claim 1, wherein:

the catheter is provided with a developing piece for judging the position of the catheter.