CN217448679U - Extension catheter and interventional medical device - Google Patents

Abstract

The utility model belongs to the technical field of intervene the medical treatment, especially, relate to an extend pipe and intervene medical equipment, this extend pipe includes conveyer pipe, sacculus and is used for supplying the main part pipe that medical instrument carried, the sacculus cover is located outside the main part pipe, the conveyer pipe sets up outside the main part pipe, the near-end of conveyer pipe is used for and outside fluid intercommunication, the distal end of conveyer pipe be used for with the inner chamber circulation of sacculus. External fluid enters the inner cavity of the balloon along the conveying pipe, so that the balloon is expanded and is abutted against the inner wall of the blood vessel, the supporting force for the extension catheter is improved, the extension catheter is fixed at a target position and is not easy to slide, and an operator can stably convey interventional medical equipment into the main body pipe.

Description

Extension catheter and interventional medical device

Technical Field

The application belongs to the technical field of interventional medical treatment, and particularly relates to an extension catheter and interventional medical equipment.

Background

With the intensive medical research on coronary heart CTO lesion and the rapid development of interventional operation, the surgical range of coronary heart treatment is gradually expanded, and tiny blood vessels are covered, including interventional treatment on collateral blood vessels on the heart. For the treatment of these coronary branches, the extension catheter products play an important role.

The extension catheter is used for guiding the guide catheter in the coronary heart CTO lesion surgical intervention process, so that the side branches and the lesions far away from the aorta can be treated more deeply. In the interventional therapy process, the extension catheter extends outwards from the interior of the guide catheter under the guidance of the guide catheter, and can further go deep into a lesion part. When the extension catheter reaches a target position, an operator can convey interventional medical devices such as a balloon catheter, a stent, medicines and the like in the extension catheter, the extension catheter is often vibrated or pulled in the process, and the extension catheter is easy to slide away from the target position due to the effect of gaps and a high hydrophilic coating existing in the matching of the extension catheter and other interventional medical devices, so that the operator needs to repeatedly position the extension catheter, the operation time is prolonged, and the operation risk is increased.

SUMMERY OF THE UTILITY MODEL

The application aims to provide an extension catheter and interventional medical equipment, and aims to solve the technical problem that the extension catheter easily slides away from a target position in the interventional treatment process in the prior art.

In order to achieve the purpose, the technical scheme adopted by the application is as follows: an extension catheter, comprising: the conveying pipe is arranged outside the main body pipe, the near end of the conveying pipe is used for being communicated with external fluid, and the far end of the conveying pipe is used for being communicated with an inner cavity of the balloon.

Further, the balloon is provided with a spinous process for abutment with the inner wall of the blood vessel.

Further, the method is carried out. In the direction from the far end to the near end of the conveying pipe, the conveying pipe comprises a first pipe section and a second pipe section which are sequentially connected and communicated, the far end of the first pipe section is communicated with the inner cavity of the saccule, the near end of the second pipe section is used for being communicated with the outside fluid, the first pipe section is arranged along the length direction of the main body pipe, and the outer side wall of the first pipe section is connected with the outer side wall of the main body pipe.

Further, the second pipe section is a hypotube section.

Further, the proximal end of the second tube segment is provided with a coupling for communicating the delivery tube with a device for injecting the external fluid.

Furthermore, a side hole is formed in the side wall of the main tube, and the side hole is closer to the far end of the main tube than the balloon.

Further, the number of the side holes is plural, the plurality of side holes are divided into plural groups in the circumferential direction of the main body tube, and the plurality of side holes in each group are distributed along the axial direction of the main body tube.

Further, the extension catheter further includes a developing element disposed on the main tube.

Further, the developing element comprises a first developing ring, a second developing ring and a third developing ring, wherein the first developing ring and the second developing ring are respectively arranged at two ends of the main body pipe, and the third developing ring is arranged at the connecting position of the main body pipe and the balloon.

One or more of the above technical solutions in the extension catheter provided by the present application have at least one of the following technical effects: when the extension catheter reaches the target position, external fluid enters the inner cavity of the balloon along the conveying pipe, so that the balloon is expanded, the outer wall of the balloon is abutted to the inner wall of the blood vessel, the supporting force for the extension catheter is increased, the extension catheter is fixed at the target position and is not easy to slide, the medical intervention instrument is conveyed into the main body tube stably by an operator, and meanwhile, the balloon can also play a role in expanding the blood vessel after expansion, the use of the balloon catheter is reduced, so the operation time is shortened, the efficiency of intervention treatment is improved, and the operation risk is reduced.

In order to achieve the above object, the present application further provides an interventional medical device including the above extension catheter.

One or more technical solutions in the interventional medical device provided by the present application have at least one of the following technical effects: when the extension catheter reaches the target position, external fluid enters the inner cavity of the balloon along the conveying pipe, the balloon is expanded, the outer wall of the balloon is abutted to the inner wall of the blood vessel, the supporting force for the extension catheter is increased, the extension catheter is fixed at the target position and is not easy to slide, the operation of stably conveying the intervention medical equipment to the main body tube by an operator is facilitated, meanwhile, the balloon can play a role in expanding the blood vessel after expansion, the use of the balloon catheter is reduced, therefore, the operation time is shortened, the efficiency of intervention treatment is improved, and the operation risk is reduced.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive exercise.

Fig. 1 is a schematic view of the overall structure of an extension catheter provided in an embodiment of the present application.

Fig. 2 is a partial structural view of the extension catheter shown in fig. 1.

Fig. 3 is an enlarged view of the extension catheter shown in fig. 1 at a.

Fig. 4 is a schematic view of a layered structure of a main tube of the extension catheter shown in fig. 1.

Wherein, in the figures, the respective reference numerals:

10. a delivery pipe; 11. a first tube section; 12. a second tube section;

20. a balloon; 21. a spinous process;

30. a main body tube; 31. a side hole;

40. a small metal ring;

50. a large metal ring;

60. a needle seat; 61. a joint;

70. a protective sleeve;

80. a developing member; 81. a first developing ring; 82. a second developing ring; 83. a third developing ring;

301. an inner layer; 302. a middle layer; 303. and (4) an outer layer.

Detailed Description

Reference will now be made in detail to embodiments of the present application, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary and intended to be used for explaining the present application and should not be construed as limiting the present application.

In the description of the present application, it is to be understood that the terms "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like, as used herein, refer to an orientation or positional relationship indicated in the drawings, which is for convenience and simplicity of description, and does not indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and thus, is not to be considered as limiting.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present application, "a plurality" means two or more unless specifically limited otherwise.

In this application, unless expressly stated or limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can include, for example, fixed connections, removable connections, or integral parts; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.

As shown in fig. 1, the present embodiment provides an extension catheter, which includes a delivery tube 10, a balloon 20, and a main tube 30 for delivering a medical device, wherein the balloon 20 is sleeved outside the main tube 30, the delivery tube 10 is disposed outside the main tube 30, a proximal end of the delivery tube 10 is configured to be in fluid communication with the outside, and a distal end of the delivery tube 10 is configured to be in fluid communication with an inner cavity of the balloon 20.

It should be noted that "proximal" in the above description and in the following description generally refers to the end of the medical device that is near the operator during normal operation, and "distal" generally refers to the end of the medical device that first enters the patient during normal operation.

The extension pipe that this application embodiment provided, when arriving the target location, outside fluid gets into in the inner chamber of sacculus 20 along conveyer pipe 10, make sacculus 20 expansion, and then realize the outer wall butt of sacculus 20 on vascular inner wall, so just increased the holding power to extending the pipe, make to extend the pipe and fix at the target location and be difficult for sliding, be favorable to the operator to transport intervention medical instrument toward main body pipe 30 internal stability, such as sacculus pipe, support and medicine etc., simultaneously, sacculus 20 expands the back, still can play the effect of expanding blood vessel, the use of sacculus pipe has been reduced, therefore, the operation time has been shortened, the efficiency of intervention treatment has been improved and the operation risk has been reduced.

In another embodiment of the present application, as shown in fig. 1, the balloon 20 is disposed near the distal end of the main tube 30, so as to provide a stronger supporting force for the extension catheter, so that the extension catheter is fixed at the target position and is not easy to slide, thereby facilitating the stable delivery of the interventional medical device into the main tube 30 by the operator.

In another embodiment of the present application, as shown in fig. 2, the balloon 20 is provided with a spinous process 21 for abutment with an inner wall of a blood vessel. When the balloon 20 is expanded to abut against the inner wall of the blood vessel, the spinous process 21 on the surface of the balloon 20 can be sunk into the inner wall of the blood vessel, so that the friction force between the balloon 20 and the inner wall of the blood vessel is increased, the extension catheter is fixed at a target position and is not easy to slide, and an operator can stably convey interventional medical devices into the main tube 30. The spinous process 21 is made of nylon or resin material, and is adhered to the surface of the balloon 20 by a special process, and the shape is preferably hemispherical, and the number is not limited, and the plurality of spinous processes 21 can be uniformly distributed on the surface of the balloon 20.

In another embodiment of the present application, the balloon 20 is a non-compliant balloon 20 having superior pressure resistance, which ensures a continuous application of high pressure to the lesion and prevents the extension catheter from deforming due to compression. The balloon 20 may be made of nylon, polyethylene, polyurethane, or polyethylene terephthalate material.

In another embodiment of the present application, the balloon 20 is in a long strip shape, the outer wall of the balloon 20 is provided with a flow guide groove extending along the axial direction thereof, when the balloon 20 is expanded to abut against the inner wall of the blood vessel, a flow passage is formed between the flow guide groove and the inner wall of the blood vessel, so that when the balloon 20 is expanded to abut against the inner wall of the blood vessel, part of blood can pass through the flow passage without being blocked, thereby increasing the blood flow and reducing the risk of the operation. The width and depth of the channels are not limited and can be selected according to the size of the balloon 20, but should ensure that the balloon 20 can provide sufficient supporting force for the extension catheter. The number of the flow guide grooves is 1, 2, 3 or more than 3, and the flow guide grooves can be uniformly distributed along the circumferential direction of the balloon 20. To achieve the above object, the present application provides another embodiment: the side wall of the main tube 30 is dug with a flow guide channel, an opening at one end of the flow guide channel is arranged between the far end of the balloon 20 and the far end of the main tube 30, and an opening at the other end of the flow guide channel is arranged between the near end of the balloon 20 and the near end of the main tube 30, so that when the balloon 20 is expanded and abutted against the inner wall of the blood vessel, part of blood can pass through the flow guide channel without being blocked, thereby increasing the blood flow.

In another embodiment of the present application, as shown in fig. 1 and 3, the delivery tube 10 includes a first tube segment 11 and a second tube segment 12 connected and communicated in sequence in a direction from the distal end to the proximal end of the delivery tube 10, the distal end of the first tube segment 11 is communicated with the inner cavity of the balloon 20, the proximal end of the second tube segment 12 is used for being communicated with the outside in a fluid manner, the first tube segment 11 is arranged along the length direction of the main body tube 30, and the outer side wall of the first tube segment 11 is connected with the outer side wall of the main body tube 30. During the interventional procedure, the first tube segment 11 is fully intravascular, the distal end of the second tube segment 12 is connected to and communicates with the proximal end of the first tube segment 11, and the proximal end of the second tube segment 12 is disposed outside the patient for the operator to inject external fluid into the second tube segment 12. Specifically, the connection manner of the first pipe segment 11 and the main body pipe 30 may be welding. To ensure that the extension catheter is advanced smoothly through the blood vessel, the diameter of the first tube segment 11 is suitably reduced so that the cross-section of the extension catheter is close to circular. The distal end of the first tube segment 11 extends into the balloon 20 so that external fluid can flow smoothly axially through the second tube segment 12 and the first tube segment 11 into the lumen of the balloon 20 and expand the balloon 20.

In another embodiment of the present application, the first tube segment 11 may also be disposed through the balloon 20, the distal opening of the first tube segment 11 is closed, and a communication port is opened on the side wall of the first tube segment 11, and the communication port is disposed at the connection between the first tube segment 11 and the balloon 20, so that the external fluid in the first tube segment 11 can flow into the inner cavity of the balloon 20 in the radial direction and expand the balloon 20. On this basis, the number of the balloons 20 is 1, 2, 3 or more than 3, the specific number of the balloons 20 can be selected according to actual requirements, the multiple balloons 20 can provide stronger supporting force for the extension catheter, the multiple balloons 20 are distributed along the axial direction of the first pipe section 11, a single balloon 20 corresponds to a single communication port, or a single balloon 20 corresponds to multiple communication ports; the specific shape of the communication port is not limited, and may be circular or square.

In another embodiment of the present application, second pipe segment 12 is a hypotube segment. Because the hypotube section possesses good compliance, bending resistance and moment of torsion transmissibility etc. at the in-process of interventional therapy, the operator can directly hold the hypotube section and steadily advance in the human body extension pipe, and the hypotube section provides good holding power and propelling movement power for the extension pipe to guarantee going on smoothly of operation. Specifically, the hypotube sections may be made of 304 stainless steel, with both the inner and outer surfaces polished to improve interventional procedure safety.

In another embodiment of the present application, as shown in fig. 1 and 3, the extension duct further comprises a small metal ring 40, the first pipe segment 11 is connected with the second pipe segment 12 through the small metal ring 40, wherein the first pipe segment 11 is glued to the small metal ring 40, and the second pipe segment 12 is welded to the small metal ring 40. The small metal ring 40 may be made of 304 stainless steel, and both the inner and outer surfaces are polished to improve the safety of interventional therapy. The small metal ring 40 plays a role in connection and communication, and openings at two sides of the small metal ring are respectively communicated with the near end of the first pipe section 11 and the far end of the second pipe section 12. In the embodiment of the present application, the outer diameter of the small metal ring 40 is equal to the outer diameter of the first pipe segment 11, and the inner diameter of the small metal ring 40, the inner diameter of the first pipe segment 11 and the inner diameter of the second pipe segment 12 are equal to each other, so that the regularity of the extension catheter can be improved, the extension catheter can be conveniently pushed in a blood vessel, and meanwhile, external fluid can smoothly and freely pass through the second pipe segment 12, the small metal ring 40 and the first pipe segment 11 and then enter the inner cavity of the balloon 20.

In the embodiment of the present application, as shown in fig. 1 and 3, the extension catheter further includes a large metal ring 50, and the large metal ring 50 is disposed at the proximal end of the main body tube 30 and welded to the small metal ring 40, so that the main body tube 30 and the delivery tube 10 can be fixedly connected. Specifically, the outer diameter of the large metal ring 50 is equal to the outer diameter of the main tube 30, and the inner diameter of the large metal ring is equal to the inner diameter of the main tube 30, so that the large metal ring 50 provides a regular delivery port for delivering the interventional medical device through the main tube 30, and the delivery of the interventional medical device is facilitated. The large metal ring 50 may be made of 304 stainless steel, with both the inner and outer surfaces polished to improve interventional procedure safety.

In another embodiment of the present application, as shown in fig. 1, the proximal end of the second tube segment 12 is provided with a coupling 61 for communicating the delivery tube 10 with means for injecting external fluids. Specifically, a needle hub 60 is connected to the proximal end of the second tube segment 12, the needle hub 60 may be made of a polymer material, and a connector 61 is disposed on the needle hub 60, specifically, a luer connector 61 for cooperating with a pressure syringe. A protective sleeve 70 is provided at the junction of the hub 60 and the delivery tube 10 for securing and sealing purposes. The external fluid may be selected from sterile saline or contrast media.

In another embodiment of the present application, as shown in fig. 2, a side hole 31 is opened on the side wall of the main tube 30, and the side hole 31 is closer to the distal end of the main tube 30 than the balloon 20. During the interventional therapy, after the extension catheter extends out of the guide catheter, the distal end and the position close to the distal end of the extension catheter may contact the inner wall of the blood vessel, and the contact position may obstruct the blood flow, so that the blood flow is reduced, and the operation risk such as oxygen deficiency is increased. In the extension catheter provided by the embodiment of the application, when the distal end of the main tube 30 and the position close to the distal end contact the inner wall of the blood vessel and block blood flow at the contact position, blood in the blood vessel can enter the main tube 30 from the side hole 31 and flow out from the distal opening of the main tube 30, so that blood vessel blockage is avoided, the conditions of acute ischemia and the like of a patient caused by blood flow reduction are prevented, and the operation risk is greatly reduced. However, in order to fully utilize the function of the side hole 31, the side hole 31 is provided at a position closer to the distal end of the main tube 30 than the balloon 20, and it is possible to solve most of the problems of the blood vessel blockage during the actual operation, and of course, the side hole 31 may be provided at a position farther from the distal end of the main tube 30 than the balloon 20.

In another embodiment of the present application, as shown in fig. 2, the number of the side holes 31 is multiple, and the multiple side holes 31 are divided into 2 groups, 3 groups, 4 groups or more than 4 groups in the circumferential direction of the main tube 30, and each group is uniformly distributed in the circumferential direction, so that when the distal end of the main tube 30 and a position close to the distal end contact with the inner wall of the blood vessel, blood in the blood vessel can enter the main tube 30 through at least one group of the side holes 31, and then flows out from the distal end opening of the main tube 30, thereby avoiding blood vessel blockage, preventing the situation that the blood flow is reduced to cause acute ischemia and the like in the patient, and greatly reducing the risk of the operation. The plurality of side holes 31 in each group are distributed along the axial direction of the main tube 30, the axial distance between every two adjacent side holes 31 in each group is larger than zero, and the side holes 31 are distributed at equal intervals to increase the blood flow, and at the same time, when the side hole 31 close to the distal end of the main tube 30 is blocked, the blood in the blood vessel can still flow into the main tube 30 from the unblocked side hole 31 far from the distal end of the main tube 30 in the same group. Of course, the axial distance between each two adjacent lateral holes 31 in each group may also be equal to zero. The specific shape of the side hole 31 is not limited, and may be circular or square.

Specifically, the number of the side holes 31 is 6, the side holes are evenly divided into two groups and symmetrically distributed at 180 degrees, and 3 side holes 31 in each group are distributed at equal intervals along the axial direction of the main tube 30, so that the condition of blood vessel blockage caused by most of extension catheters in interventional therapy can be solved, and the operation risk is reduced.

In another embodiment of the present application, as shown in fig. 1 and 2, the extension catheter provided further comprises a visualization element 80, the visualization element 80 being provided on the main tube 30. During imaging operations, the visualization element 80 may display a shadow to provide positional information to the operator. The developing element 80 is made of developing material which is not transparent to X-ray, and the developing material is one or more of gold, tungsten, platinum and platinum-iridium alloy. The development element 80 may be a development ring, a development coil in a cylindrical spiral shape, or a development coating applied to the side wall of the extension duct. Specifically, the developing element 80 is preferably a developing ring, which includes a first developing ring 81, a second developing ring 82 and a third developing ring 83, the first developing ring 81 is disposed at the distal end of the main tube 30, the second developing ring 82 is disposed at the connection position of the main tube 30 and the balloon 20, and the third developing ring 83 is disposed at the proximal end of the main tube 30, so as to help the operator to quickly catch the positions of the main tube 30 and the balloon 20.

In another embodiment of the present application, as shown in fig. 4, the main tube 30 includes an inner layer 301, a middle layer 302 and an outer layer 303 from inside to outside, the inner layer 301 is a teflon coating layer, the middle layer 302 is a metal layer, and the outer layer 303 is a polymer material layer. A channel for transporting the interventional medical device is provided in the inner layer 301, and the polytetrafluoroethylene coating has a low friction coefficient, so that the interventional medical device can pass through and be transported conveniently; the metal layer of the middle layer 302 is preferably a spring-wound wire structure to improve the kink resistance and kink control of the extension catheter; the high polymer material layer of the outer layer 303 wraps the metal layer of the middle layer 302, so that the metal is prevented from scratching the blood vessel, meanwhile, the contact surface of the high polymer material layer and the inner wall of the blood vessel is smooth, and the conveying performance of the extension catheter in the blood vessel can be improved. Wherein the metal layer of the middle layer 302 is welded to the large metal ring 50.

The first pipe section 11 is not provided with a metal layer, and is divided into a polytetrafluoroethylene coating and a polymer material layer from inside to outside, wherein the polymer material layer is glued with the small metal ring 40.

Embodiments of the present application further provide an interventional medical device, including the extension catheter provided in each of the above embodiments.

In embodiments of the present application, the interventional medical device may further comprise one or more of a guiding catheter, a guide wire, a balloon catheter, a stent, a drug. In the interventional therapy process, the extension catheter is arranged in the guide catheter in a penetrating way and can extend out of the guide catheter to extend to a target lesion part; the extension catheter is internally provided with a transportation channel for interventional medical devices, and the guide wire penetrates through the extension catheter, so that on one hand, the guide is provided for the extension catheter, and on the other hand, the guide rail is provided for the interventional medical devices such as balloon catheters, stents and medicines for transportation.

Under the guide of seal wire, when the extension pipe stretches out and reaches the target location from the guide pipe, outside fluid gets into in the inner chamber of sacculus 20 along conveyer pipe 10, make sacculus 20 expand, and then realize that the outer wall butt of sacculus 20 is on vascular inner wall, so just increased the holding power to the extension pipe, make the extension pipe fix at the target location and be difficult for sliding, be favorable to the operator to transport intervention medical instrument towards main body pipe 30 internal stability, like sacculus pipe, support, medicine etc., simultaneously, after the sacculus 20 expands, still can play the effect of expansion blood vessel, the use of sacculus pipe has been reduced, the operation time has been shortened, the efficiency of interventional therapy has been improved and the operation risk has been reduced. In addition, the interventional medical device has other technical effects of the extension catheter provided by the above embodiments, and the detailed description is omitted here.

The above description is only exemplary of the present application and should not be taken as limiting the present application, as any modification, equivalent replacement, or improvement made within the spirit and principle of the present application should be included in the protection scope of the present application.

Claims (10)

1. An extension catheter, comprising: including conveyer pipe, sacculus and be used for supplying the main part pipe that medical instrument carried, the sacculus cover is located outside the main part pipe, the conveyer pipe sets up outside the main part pipe, the near-end of conveyer pipe is used for and outside fluid intercommunication, the distal end of conveyer pipe be used for with the inner chamber circulation of sacculus.

2. The extension catheter of claim 1, wherein: the sacculus is provided with a spinous process used for being abutted against the inner wall of the blood vessel.

3. The extension catheter of claim 1, wherein: in the direction from the far end to the near end of the conveying pipe, the conveying pipe comprises a first pipe section and a second pipe section which are sequentially connected and communicated, the far end of the first pipe section is communicated with the inner cavity of the balloon, the near end of the second pipe section is used for being communicated with external fluid, the first pipe section is arranged along the length direction of the main body pipe, and the outer side wall of the first pipe section is connected with the outer side wall of the main body pipe.

4. The extension catheter of claim 3, wherein: the second pipe section is a hypotube section.

5. The extension catheter of claim 3, wherein: the proximal end of the second tube section is provided with a connector for communicating the delivery tube with a device for injecting the external fluid.

6. The extension duct of any one of claims 1 to 5, wherein: a side hole is formed in the side wall of the main body tube, and compared with the balloon, the side hole is closer to the far end of the main body tube.

7. The extension catheter of claim 6, wherein: the quantity of side opening is a plurality of, and is a plurality of the side opening is in the circumference of main part pipe divides into the multiunit, and a plurality of in every group the side opening is followed the axial of main part pipe distributes.

8. The extension catheter of any one of claims 1 to 5, wherein: the extension catheter further includes a visualization element disposed on the main tube.

9. The extension catheter of claim 8, wherein: the developing element comprises a first developing ring, a second developing ring and a third developing ring, the first developing ring and the second developing ring are arranged at two ends of the main body pipe respectively, and the third developing ring is arranged at the connecting position of the main body pipe and the balloon.

10. An interventional medical device, characterized by: comprising an extension catheter according to any one of claims 1 to 9.

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