WO2024067241A1

WO2024067241A1 - Occlusion catheter and medical system

Info

Publication number: WO2024067241A1
Application number: PCT/CN2023/119636
Authority: WO
Inventors: 时欣; 周炯
Original assignee: 神途医疗科技(上海)有限公司
Priority date: 2022-09-28
Filing date: 2023-09-19
Publication date: 2024-04-04
Also published as: CN117815518A

Abstract

The present invention provides an occlusion catheter and a medical system. The occlusion catheter comprises a multi-cavity tube, a first expandable element, and a second expandable element. The first expandable element and the second expandable element are arranged on the multi-cavity tube and spaced apart from each other at a set distance in the axial direction of the multi-cavity tube. The multi-cavity tube is provided with a liquid passage cavity and a conveying cavity. The liquid passage cavity extends from the proximal end of the multi-cavity tube towards the distal end of the multi-cavity tube and is in communication with an inner cavity of the first expandable element and an inner cavity of the second expandable element. The conveying cavity is arranged to penetrate, in the axial direction of the multi-cavity tube, from the proximal end of the multi-cavity pipe to a position between the first expandable element and the second expandable element. The multi-cavity tube has an opening on the side wall between the first expandable element and the second expandable element. The opening is in communication with the conveying cavity and configured for allowing an instrument in the conveying cavity to penetrate out. In a surgical procedure, the occlusion catheter is used for performing real-time protection, such that thrombus escape in the internal carotid artery can be prevented.

Description

Blocking catheters and medical systems

Technical Field

The invention relates to the field of medical technology, and in particular to a catheter blocking system and a medical system.

Background technique

Figure 1 is a partial cross-sectional view of the carotid artery. Carotid artery stenosis usually manifests as the accumulation of plaque B in the internal carotid artery (ICA), which narrows the blood vessels supplying blood to the brain. If these accumulated plaques are unstable plaques, some emboli or particles produced by them may be washed into the more distal and thinner blood vessels in the brain by the blood, leading to cerebral ischemia, stroke, and even death.

There are currently two main ways to treat carotid artery stenosis. One is to perform a surgical operation to expose and open the carotid artery and perform carotid endarterectomy (CEA). The other is to perform an interventional operation to place a stent in the carotid artery through the femoral artery for carotid artery reconstruction surgery (CAS).

During CEA surgery, the carotid artery needs to be exposed and cut open, which can easily cause complications such as nerve damage, and the wound is large, requiring a long bed rest period after surgery. At the same time, during CEA treatment, the upper and lower parts of the lesion area are clamped before the operation. During the operation, the blood supply to the brain is mainly provided by the contralateral carotid artery. The CEA operation takes a long time, and long-term insufficient blood supply to the brain may cause serious damage to cerebral blood vessels.

In CAS surgery, the operation time is shorter and the incision is smaller, but during the stent placement process, plaques may break off and escape to smaller blood vessels at the distal end, further leading to complications such as stroke. Although there are currently distal umbrellas for emboli capture, the placement and function of the distal umbrella are limited by various reasons. In addition, the placement of the distal umbrella requires the umbrella to be placed through the lesion area and further away. Before the umbrella is placed, there is no embolic protection, which is also an important cause of stroke complications during surgery.

Summary of the invention

The object of the present invention is to provide an occluding catheter and a medical system to solve one or more problems in the prior art.

In order to solve the above problems, the present invention provides a blocking catheter, a blocking catheter, which is characterized in that The occluding catheter comprises: a multi-lumen tube, a first expandable element and a second expandable element;

The first expandable element and the second expandable element are arranged in the multi-lumen tube at a set distance along the extension direction of the multi-lumen tube; the multi-lumen tube has a liquid passage cavity and a delivery cavity; the liquid passage cavity extends from the proximal end to the distal end of the multi-lumen tube and is connected with the inner cavity of the first expandable element and the second expandable element; the delivery cavity is arranged to pass through the multi-lumen tube from the proximal end of the multi-lumen tube to the position between the first expandable element and the second expandable element along the axial direction of the multi-lumen tube; the multi-lumen tube has an opening on the side wall between the first expandable element and the second expandable element, and the opening is connected with the delivery cavity for allowing the instrument in the delivery cavity to pass out.

Optionally, in the blocking catheter, the liquid passage cavity includes a first chamber and a second chamber, and the first chamber and the second chamber are respectively connected to the inner cavities of the first expandable element and the second expandable element.

Optionally, in the blocking catheter, the cross-section of the delivery cavity is circular, and the axis of the delivery cavity deviates from the axis of the multi-cavity tube, the first chamber is distributed in a ring around the delivery cavity, and the second chamber is arranged on the side where the delivery cavity has the maximum distance from the first chamber, and is located between the first chamber and the delivery cavity.

Optionally, in the blocking catheter, the blocking catheter also includes an elastic structure, which is used to seal the distal end of the multi-cavity body. The elastic structure has a passage for the guide wire to pass through the distal end of the multi-cavity tube. The passage is closed in a natural state, and cooperates with the guide wire through elastic deformation when the guide wire passes through.

Optionally, in the occluding catheter, the multi-lumen tube includes a first section and a second section connected to the distal end of the first section, wherein the first expandable element is arranged in the first section, the second expandable element is arranged in the second section, and the opening is located at the connection between the first section and the second section.

Optionally, in the occluding catheter, an outer diameter of the second section is smaller than an outer diameter of the first section.

Optionally, in the occluding catheter, the distal end of the first chamber is communicated with the inner cavity of the first expandable element; or,

The distal end of the first chamber extends to the second segment, and at least the portion of the first chamber extending beyond the distal end of the first expandable element is filled with reinforcing ribs.

Optionally, in the blocking catheter, the cross-section of the delivery cavity is circular, and the axis of the delivery cavity deviates from the axis of the multi-lumen tube, and the liquid passage cavity is on the side where the delivery cavity has the maximum distance from the outer wall of the multi-lumen tube.

The present invention also provides a medical system, comprising:

The occluding catheter as described in any one of the above items, and

A guide wire is used to pass through the distal end of the occluding catheter along the delivery cavity to guide the occluding catheter to reach the target tissue.

Optionally, in the medical system, the medical system further comprises:

An instrument is used to penetrate into the delivery cavity and pass out from the opening to perform a medical operation on the target tissue.

In summary, the blocking catheter and medical system provided by the present invention include: a multi-lumen tube, a first expandable element and a second expandable element; the first expandable element and the second expandable element are arranged in the multi-lumen tube at a set distance along the axial direction of the multi-lumen tube; the multi-lumen tube has a liquid passage cavity and a delivery cavity; the liquid passage cavity extends from the proximal end of the multi-lumen tube toward the distal end, and is connected with the inner cavity of the first expandable element and the second expandable element; the delivery cavity is arranged along the axial direction of the multi-lumen tube from the proximal end of the multi-lumen tube to the position between the first expandable element and the second expandable element, and the multi-lumen tube has an opening on the side wall between the first expandable element and the second expandable element, and the opening is connected with the delivery cavity for allowing the instrument in the delivery cavity to pass through. The blocking catheter and medical device provided by the present invention have at least the following advantages:

1. During the operation, the occlusion catheter is used to occlude the common carotid artery and the external carotid artery for real-time protection, which can better prevent the thrombus in the internal carotid artery from escaping.

2. The guide wire can pass through the side wall between the two expansion elements, which is beneficial for positioning the two expansion elements on the bifurcated blood vessel.

3. An elastic structure is provided at the distal end, which can allow the guide wire to pass through while preventing blood from flowing into the occlusion area through the distal port, thus ensuring the occlusion effect.

4. Reinforcement ribs are set at the far end to improve connection strength and pushing performance.

BRIEF DESCRIPTION OF THE DRAWINGS

Fig. 1 is a partial cross-sectional view of the carotid artery;

FIG2 is a schematic diagram of a working state of an occluding catheter in a carotid artery provided by an embodiment of the present invention;

FIG3 is a schematic diagram of the overall structure of a blocking catheter provided by an embodiment of the present invention;

FIG4 is a schematic diagram of a local structure of the distal end of an occluding catheter provided in an embodiment of the present invention;

5 and 6 are schematic diagrams of the elastic structure in a closed state and an open state, respectively, according to an embodiment of the present invention;

FIG7 is a schematic cross-sectional view of the blocking catheter taken along the line a-a as shown in FIG3 in Embodiment 1 of the present invention;

FIG8 is a schematic diagram of a cross section b-b of the blocking catheter shown in FIG3 in Embodiment 1 of the present invention;

FIG9 is another b-b cross-sectional schematic diagram of the blocking catheter shown in FIG4 in Embodiment 1 of the present invention;

FIG10 is a schematic diagram of a first chamber provided with reinforcing ribs in an embodiment of the present invention;

Fig. 11 is a schematic diagram of the A-A section shown in Fig. 9;

FIG12 is a schematic cross-sectional view of the blocking catheter taken along the line a-a as shown in FIG3 in Embodiment 2 of the present invention;

FIG13 is a schematic diagram of a cross section b-b of the blocking catheter shown in FIG3 in Embodiment 2 of the present invention;

FIG14 is another a-a cross-sectional schematic diagram of the blocking catheter shown in FIG3 in Embodiment 2 of the present invention;

FIG15 is another b-b cross-sectional schematic diagram of the blocking catheter shown in FIG3 in Embodiment 2 of the present invention;

The descriptions of the reference numerals are as follows:
11-multi-lumen tube; 12-first expandable element; 13-second expandable element; 14-elastic structure; 15-
Connecting device;
100 - first chamber; 200 - second chamber; 300 - delivery chamber; 400 - opening; 500 - passage;
600-Reinforcement ribs;
111-first paragraph; 112-second paragraph.

Detailed ways

The present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments. The advantages and features of the present invention will become more apparent from the following description. It should be noted that the accompanying drawings are in very simplified form and in non-precise proportions, and are only used to conveniently and clearly assist in explaining the purpose of the embodiments of the present invention. In addition, the structure shown in the drawings is often a part of the actual structure. In particular, the drawings need to show different focuses and sometimes use different scales. It should also be understood that, unless otherwise specified or indicated, the terms "first", "second", "third", etc. in the specification are only used to distinguish the various components, elements, steps, etc. in the specification, and are not used to represent the logical relationship or sequential relationship between the various components, elements, steps, etc.

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

[Example 1]

Please refer to FIG. 2 and FIG. 3 , an embodiment of the present invention provides a blocking catheter, which includes: a multi-lumen tube 11 , a first expandable element 12 and a second expandable element 13 .

The first expandable element 12 and the second expandable element 13 are disposed in the multi-lumen tube 11 at a set distance along the extension direction of the multi-lumen tube 11 .

The multi-lumen tube 11 has a liquid-passing cavity, which extends from the proximal end to the distal end of the multi-lumen tube 11 and is connected to the inner cavities of the first expandable element 12 and the second expandable element 13; in order to facilitate the introduction of filling liquid into the first expandable element 12 and the second expandable element 13 respectively, so as to respectively control the expansion of the first expandable element 12 and the second expandable element 13, preferably, refer to Figures 7 to 9, the liquid-passing cavity includes a first chamber 100 and a second chamber 200, and the first chamber 100 and the second chamber 200 are respectively connected to the inner cavities of the first expandable element 12 and the second expandable element 13.

The multi-lumen tube 11 further has a delivery lumen 300, which is arranged along the axial direction of the multi-lumen tube 11 from the proximal end of the multi-lumen tube 11 to a position between the first expandable element 12 and the second expandable element 13. Optionally, the delivery lumen 300 is arranged along the axial direction of the multi-lumen tube 11 from the proximal end to the distal end of the multi-lumen tube 11.

In addition, please refer to FIG. 4 , the multi-lumen tube 11 has an opening 400 on the side wall between the first expandable element 12 and the second expandable element 13 , and the opening 400 is connected to the delivery lumen 300 for allowing the instruments in the delivery lumen 300 to pass through.

Before the operation begins, the blocking catheter provided by the embodiment of the present invention reaches the target position through the sheath tube, and then is in place under the guidance of the guide wire. Before the operation begins, the first chamber 100 is used to introduce filling liquid into the first expandable element 12, so that the first expandable element 12 blocks the external carotid artery, and the second chamber 200 is used to introduce filling liquid into the second expandable element 13, so that the second expandable element 13 blocks the common carotid artery. After the external carotid artery and the common carotid artery are blocked by the first expandable element 12 and the second expandable element 13, respectively, blood cannot flow from bottom to top in the internal carotid artery, so during the subsequent operation (such as stent placement), the thrombus will not escape to the smaller blood vessels at the far end. Moreover, since the operation process is shorter than that of CEA surgery, it can also avoid serious damage to cerebral blood vessels due to long-term insufficient blood supply to the brain.

The first chamber 100 and the second chamber 200 of the occluding catheter provided in the embodiment of the present invention are mainly used to pass the filling fluid to expand the first expandable element 12 and the second expandable element 13 respectively. The delivery lumen 300 is a multifunctional chamber, which is used to insert a guide wire so that the guide wire can be guided to the position, and to insert an instrument after the guide wire is withdrawn. After the instrument is inserted into the delivery lumen 300, it is passed out from the opening 400 to enter the lesion area of the internal carotid artery for surgical operation. In addition, the delivery cavity 300 can also be used as a reflux cavity. Specifically, a reflux pipeline can be connected to the distal end of the delivery cavity 300. One end of the reflux pipeline is connected to the distal end of the delivery cavity 300, and the other end is connected to a vein (such as the femoral vein, the jugular vein, etc.). In this way, the pressure difference between the artery and the vein can be used to make the blood in the lesion area of the internal carotid artery stagnant due to the blockage flow through the opening 400, the delivery cavity 300, the reflux pipeline in sequence, and finally flow to the vein. A filtering device can be set in the reflux pipeline. During the process of blood flowing to the vein, the thrombus detached from the lesion area can be recovered by the filtering device to prevent the thrombus in the blood from flowing to the vein. In addition, different sections of the delivery cavity 300 can play different roles. For example, the cavity far from the opening 400 is used as a rapid exchange port for passing a guide wire, and the cavity near the opening 400 is used as an instrument delivery cavity for passing medical devices such as stents and suction catheters.

The first expandable element 12 and the second expandable element 13 can be single-layer or double-layer balloons, and the material can be selected from silicone, or polymer materials such as polyester, polyurethane, thermoplastic elastomer, polyethylene, polyolefin copolymer, etc., or can also be selected from a combination of multiple of these materials, which will not be repeated here.

Please refer to Fig. 3. In this embodiment, the multi-lumen tube 11 includes a first section 111 and a second section 112 connected to the distal end of the first section 111. The opening 400 for the instrument to pass through is provided at the connection between the first section 111 and the second section 112. The first expandable element 12 is provided at the first section 111, and the second expandable element 13 is provided at the second section 112. In order to perform omnidirectional blocking to ensure the blocking effect, the first expandable element 12 can be sleeved on the first section 111, and the second expandable element 13 can be sleeved on the second section 112.

Preferably, the axis of the first section 111 and the axis of the second section 112 are arranged at an angle so that the second section 112 can pass into a distal branch (such as from the common carotid artery into the external carotid artery).

Further preferably, at least the first section 111 is a deformable section, and the first section 111 is used to adjust the angle between the first section 111 and the second section 112 through deformation.

In addition, preferably, the outer diameter of the second section 112 is smaller than the outer diameter of the first section 111. On the one hand, this allows the second section 112 to pass into a blood vessel branch with a smaller inner diameter. On the other hand, the second section 112 with a smaller outer diameter has a lower rigidity than the first section 111, and is therefore easier to change its shape to adjust its offset angle and direction relative to the first section 111.

Preferably, referring to FIG. 4 , the blocking catheter further comprises an elastic structure 14, which is used to seal the distal end of the multi-lumen tube 11, and the elastic structure 14 has a passage 500 for the guide wire to pass through the distal end of the multi-lumen tube 11, and the passage 500 is closed in a natural state, and is elastically deformed to be in an open state to cooperate with the guide wire when the guide wire passes through. The setting of the elastic structure 14 can prevent blood flow from entering the blocking area through the distal port and affecting the bifurcated blood vessels during surgery.

In this embodiment, optionally, the elastic structure 14 may include an elastic tube and an elastic ring, wherein the elastic tube is used for the guide wire to pass through, and after the guide wire is inserted, the elastic ring is sleeved on the elastic tube, at which time the elastic ring squeezes a partial area of the elastic tube so that the elastic tube and the guide wire cooperate, and after the guide wire is withdrawn from the proximal end, the elastic ring shrinks so that the corresponding area of the elastic tube is closed, thereby maintaining the seal on the distal end of the multi-lumen tube 11.

In the above optional implementation, there may be a risk that the elastic ring will fall off during use. Therefore, in this embodiment, preferably, referring to FIG. 5 and FIG. 6 , the elastic structure 14 may be an integrally formed elastic body, the elastic body at least partially in the shape of a flat mouth, having a through passage 500, The passage 500 is closed before the guide wire is inserted. After the elastic body is squeezed along the width direction of the elastic body to produce elastic deformation, the passage 500 is opened to allow the guide wire to pass through. After the guide wire passes through, the squeezing is stopped. At this time, the inner diameter of the elastomer adapts to the change in the outer diameter of the guide wire. The two cooperate with each other to seal the distal end of the multi-lumen tube 11 to prevent blood from entering the multi-lumen tube 11 from the distal end of the multi-lumen tube 11. After the guide wire is withdrawn from the proximal end, the elastic structure 14 returns to the closed state, thereby maintaining the sealing of the distal end of the multi-lumen tube 11.

In this embodiment, referring to FIGS. 7 and 8 , the cross section of the delivery cavity 300 is circular, and the axis of the delivery cavity 300 deviates from the axis of the multi-lumen tube 11, so that in the eccentric direction of the delivery cavity 300, one side of the delivery cavity 300 is relatively farther from the outer wall of the multi-lumen tube 11, while the other side is relatively closer to the outer wall of the multi-lumen tube 11. In order to facilitate the arrangement of the first chamber 100 and the second chamber 200, the first chamber 100 and the second chamber 200 are arranged on the side where the delivery cavity 300 has the largest distance from the outer wall of the multi-lumen tube 11. When the first chamber 100, the second chamber 200 and the delivery cavity 300 are arranged in this way, the inner cavity of the delivery cavity 300 can be maximized without changing the outer diameter, so as to better ensure the patency of the delivery cavity 300 when used as a reflux cavity. In some other embodiments, the liquid passage cavity is a single cavity, and the liquid passage cavity is located on the side where the delivery cavity 300 has the largest distance from the outer wall of the multi-lumen tube 11.

The cross-sections of the first chamber 100 and the second chamber 200 may be circular, but the present application is not limited thereto. In other embodiments, the cross-sections of the first chamber 100 and the second chamber 200 may also be square, triangular, elliptical, etc. However, considering the difficulty of actual engineering, it is preferred that the cross-sections of the first chamber 100 and the second chamber 200 are circular, and considering the requirements for the flow rate of the filling liquid, the first chamber 100 and the second chamber 200 are arranged in sequence along the circumferential direction.

In this embodiment, the distal end of the second chamber 200 extends to the second section 112 and communicates with the inner cavity of the second expandable element 13; for the first chamber 100, optionally, the distal end of the first chamber 100 extends to no more than the first section 111 and communicates with the inner cavity of the first expandable element 12, or, referring to FIG. 9, the distal end of the first chamber 100 extends to the second section 112 after passing through the first expandable element 12, for example, it can extend to the farthest end of the second section 112, and the first chamber 100 can adopt a variable diameter design, with the distal end diameter being smaller than the proximal end diameter to match the first chamber 100. The outer diameters of the first section 111 and the second section 112 .

Please refer to Figures 10 and 11. Preferably, at least the portion of the first chamber 100 that passes through the outside of the first expandable element 12 is filled with reinforcing ribs 600. The reinforcing ribs 600 can improve the connection strength of the connection between the first section 111 and the second section 112, thereby ensuring the pushing performance during the pushing process. The proximal end of the reinforcing rib 600 can extend into the first section 111, and the distal end can extend to the farthest end of the second section 112. The reinforcing rib 600 can also adopt a variable diameter design, with the outer diameter gradually decreasing from the proximal end to the distal end, and the hardness can also gradually decrease from the proximal end to the distal end. The material can be a developing wire, or a polymer wire wrapped with a developing metal or ordinary metal, so as to facilitate the polymer bonding with the inner surface of the first chamber 100. In addition, in order to facilitate the setting of the reinforcing rib 600, the first section 111 and the second section 112 can be formed separately, and after the setting of the reinforcing rib 600 is completed, they can be fixedly connected by welding or the like.

Preferably, from the first section 111 to the second section 112, the second chamber 200 and the delivery chamber 300 adopt a variable diameter design, that is, the cross-sectional shape does not change, but the size is reduced at a certain ratio to adapt to the size of the first section 111 and the second section 112. Such a design is conducive to reducing the difficulty of splicing the first section 111 and the second section 112. If the first chamber 100 extends to the second section 112, similarly, the first chamber 100 also adopts a variable diameter design.

The occluding catheter provided in an embodiment of the present invention may further include a connecting device 15, which is connected to the proximal end of the multi-lumen tube 11, and has an inner cavity arranged along the axial direction, and the connecting device 15 has a plurality of connectors connected to the inner cavity, and the plurality of connectors are respectively used for external filling fluid perfusion, recovery equipment and connection of a reflux tube, etc.

An embodiment of the present invention further provides a medical system, which includes: the occluding catheter and a guidewire as provided in this embodiment, wherein the guidewire is used to pass through the distal end of the occluding catheter along the delivery cavity 300 to guide the occluding catheter to reach the target tissue.

The medical system may further include an instrument, which is used to penetrate the delivery cavity 300 and pass out from the opening 400 to perform a medical operation on the target tissue. The present application does not specifically limit the type of the instrument, for example, the instrument may be a therapeutic instrument for treating carotid artery or intracranial vascular diseases, or may simply be an instrument for placing a vascular stent.

Optionally, the medical system may further include a sheath tube, the sheath tube being used to be sleeved on the blocking guide tube. A tube is used to guide the occluding catheter to a target position.

[Example 2]

The second embodiment is similar to the first embodiment, and only the differences are described below.

In this embodiment, referring to FIGS. 12 and 13 , the cross section of the delivery cavity 300 is circular, and the axis of the delivery cavity 300 deviates from the axis of the multi-lumen tube 11. The first chamber 100 is distributed in an annular manner around the delivery cavity 300 and is coaxially arranged with the multi-lumen tube 11. The second chamber 200 is arranged on the side where the delivery cavity 300 and the second chamber 200 have the maximum distance, and is located between the first chamber 100 and the delivery cavity 300. This embodiment does not specifically limit the shape of the second chamber 200, and the cross section of the second chamber 200 can be circular, square, oblong (oval), etc. When the cross section of the second chamber 200 is an oblong as shown in FIGS. 14 and 15 , the outer diameter of the multi-lumen tube 11 can be minimized while the volume of the chamber remains unchanged.

Compared with the first embodiment, the size of the multi-lumen tube in the second embodiment is easier to control, and the processing technology is relatively simpler. In addition, since the wall thickness of the multi-lumen tube 11 in the present embodiment is thicker, the supporting performance is better under the condition of equal outer diameter, and since the multi-lumen tube 11 in the present embodiment is an inner and outer double-layer structure, there are more material combinations to adjust its hardness transition.

In this embodiment, the second chamber 200 and/or the delivery chamber 300 can be deformed in the second section 112. For example, when the distal end of the first chamber 100 does not extend to the second section 112, the cross-section of the second chamber 200 in the second section 112 is not reduced by a certain proportion relative to the cross-section of the first section 111, but its shape can be changed, for example, from an oblong shape to a ring shape surrounding the delivery chamber 300, thereby increasing the flow rate of the filling fluid flowing through the second chamber 200.

The blocking catheters provided in the above two embodiments can be selected according to different usage situations. For example, when entering the common carotid artery and external carotid artery through carotid artery puncture, since the entire blood vessel from the puncture point to the target blood vessel is relatively straight and the route is short, the blocking catheter provided in embodiment 1 can be used to maximize the main lumen; if the target blood vessel is reached through femoral artery puncture, since the entire path is long and there may be relatively tortuous blood vessels, the blocking catheter provided in embodiment 2 can be used to adjust the hardness support and flexibility of different sections.

In addition, in the above two embodiments, the inner wall of each lumen of the multi-lumen tube can include an inner layer The inner layer may be made of polytetrafluoroethylene (PTFE) or the like to ensure smooth sliding when used in conjunction with other devices. In order to further ensure support and flexibility, a spring or braided structure made of stainless steel, nickel titanium or other materials may be added between the inner layer and the outer layer.

In summary, the occluding catheter and medical system provided by the present invention include: a multi-lumen tube, a first expandable element and a second expandable element; the first expandable element and the second expandable element are arranged in the multi-lumen tube at a set distance along the axial direction of the multi-lumen tube; the multi-lumen tube has a liquid passage cavity and a delivery cavity; the liquid passage cavity extends from the proximal end of the multi-lumen tube to the distal end, and is connected with the inner cavity of the first expandable element and the second expandable element; the delivery cavity is arranged along the axial direction of the multi-lumen tube from the proximal end of the multi-lumen tube to the position between the first expandable element and the second expandable element, and the multi-lumen tube has an opening on the side wall between the first expandable element and the second expandable element, and the opening is connected with the delivery cavity for the instrument in the delivery cavity to pass through. In CAS surgery, the occluding catheter is used to occlude the common carotid artery and the external carotid artery for real-time protection, which can better prevent the escape of thrombus in the internal carotid artery.

It should be noted that the various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other. In addition, the different parts between the various embodiments can also be used in combination with each other, and the present invention is not limited to this.

The above description is only a description of the preferred embodiments of the present invention, and is not intended to limit the scope of the present invention. Any changes or modifications made by a person skilled in the art in the field of the present invention based on the above disclosure shall fall within the scope of protection of the claims.

Claims

A blocking catheter, characterized in that the blocking catheter comprises: a multi-lumen tube, a first expandable element and a second expandable element;

The first expandable element and the second expandable element are arranged in the multi-lumen tube at a set distance along the extension direction of the multi-lumen tube; the multi-lumen tube has a liquid passage cavity and a delivery cavity; the liquid passage cavity extends from the proximal end to the distal end of the multi-lumen tube and is connected with the inner cavity of the first expandable element and the second expandable element; the delivery cavity is arranged to pass through the multi-lumen tube from the proximal end of the multi-lumen tube to the position between the first expandable element and the second expandable element along the axial direction of the multi-lumen tube; the multi-lumen tube has an opening on the side wall between the first expandable element and the second expandable element, and the opening is connected with the delivery cavity for allowing the instrument in the delivery cavity to pass out.
The occluding catheter according to claim 1, characterized in that the liquid passage cavity comprises a first chamber and a second chamber, and the first chamber and the second chamber are respectively connected to the inner cavities of the first expandable element and the second expandable element.
The occluding catheter according to claim 2 is characterized in that the cross-section of the delivery cavity is circular, and the axis of the delivery cavity deviates from the axis of the multi-lumen tube, the first chamber is distributed in a ring around the delivery cavity, and the second chamber is arranged on the side where the delivery cavity has the maximum distance from the first chamber, and is located between the first chamber and the delivery cavity.
The occluding catheter as described in claim 1 is characterized in that the occluding catheter also includes an elastic structure, which is used to seal the distal end of the multi-lumen body, and the elastic structure has a passage for the guide wire to pass through the distal end of the multi-lumen tube, and the passage is closed in a natural state, and cooperates with the guide wire through elastic deformation when the guide wire passes through.
The occluding catheter as described in claim 1 is characterized in that the multi-lumen tube includes a first section and a second section connected to the distal end of the first section, wherein the first expandable element is arranged in the first section, the second expandable element is arranged in the second section, and the opening is located at the connection between the first section and the second section.
The occluding catheter according to claim 5, characterized in that the outer diameter of the second section is smaller than the outer diameter of the first section.
The occluding catheter according to claim 5, characterized in that the distal end of the first chamber is connected to the inner cavity of the first expandable element; or

The distal end of the first chamber extends to the second section after passing through the first expandable element, and at least a portion of the first chamber that passes through the distal end of the first expandable element is filled with reinforcing ribs.
The occluding catheter as described in claim 1 is characterized in that the cross-section of the delivery cavity is circular, and the axis of the delivery cavity deviates from the axis of the multi-lumen tube, and the liquid passage cavity is located on the side where the delivery cavity has the maximum distance from the outer side wall of the multi-lumen tube.
A medical system, characterized in that the medical system comprises:

The occluding catheter according to any one of claims 1 to 8, and

A guide wire is used to pass through the distal end of the occluding catheter along the delivery cavity to guide the occluding catheter to reach the target tissue.
The medical system according to claim 9, characterized in that the medical system further comprises:

An instrument is used to penetrate into the delivery cavity and pass out from the opening to perform a medical operation on the target tissue.