CN216148138U - Plugging balloon catheter with suction function at far end - Google Patents

Abstract

The utility model discloses an occlusion balloon catheter with a suction distal end, which comprises an outer tube, wherein an expandable or collapsible occlusion element is arranged at the distal end of the outer tube; the inner tube and the outer tube are fixedly connected at the far end, and an annular cavity between the inner tube and the outer tube forms a liquid injection channel of the balloon; the distal end of the suction pipe penetrates out of the inner tube and is used for sucking thrombus; the outer tube, the inner tube and the suction tube are coaxially arranged. The utility model combines the suction tube on the basis of the structure of the prior balloon catheter, when the intervention operation of cerebral arterial thrombosis is carried out, the balloon can be expanded at the tortuous section of cerebral artery, and the suction tube is longer and thinner than the balloon catheter, so that the suction of thrombus can be carried out at the small vessel at the farther end, and the technical problem that the thrombus suction can not be carried out at the farther end of the tortuous section of cerebral artery because the head end part at the far end of the balloon catheter is very short and has larger inner diameter in the prior art is solved.

Description

Plugging balloon catheter with suction function at far end

Technical Field

The utility model relates to the technical field of medical instruments for operation, in particular to a plugging balloon catheter with a suction distal end.

Background

Cerebral apoplexy (also called stroke) is an acute cerebrovascular disease, and is generally a brain tissue injury caused by sudden rupture of cerebral vessels or blood failure to flow into the brain due to vessel occlusion. The cerebral apoplexy comprises ischemic stroke and hemorrhagic stroke, wherein the incidence rate of the ischemic stroke is far higher than that of the hemorrhagic stroke and accounts for 60 to 70 percent of the total number of the cerebral stroke, and common causes comprise arterial stenotic occlusion, arterial embolism and cerebral blood low perfusion.

Among them, the stenotic occlusion of an artery mainly refers to the stenosis or occlusion of a lumen caused by the pathological changes of the artery itself, and atherosclerosis is common in clinic. Atherosclerosis mainly occurs in large and middle arteries with the caliber of more than 400 mu m, and the pathological change is the formation of atherosclerotic plaque on the intima and secondary thrombosis, which leads to artery stenosis and occlusion, and further causes ischemia of the blood supply area of a diseased blood vessel.

Arterial embolism refers to the fact that emboli entering an artery block the artery with relatively small diameter at the far end along with blood flow, so that cerebral tissues in a blood supply area of the artery are subjected to ischemic change. The origin of emboli is different, and the mechanism of arterial embolism formation is also different. Arterial-arterial embolization is the most common pathogenesis of ischemic stroke, in which the emboli originate from the rupture of larger atherosclerotic plaques or the shedding of thrombi.

In order to solve the problem that the blood vessel is blocked due to the existence of thrombus in the ischemic stroke, the methods solved in the prior art comprise medicinal thrombolysis and mechanical thrombolysis. The drug thrombolysis is characterized in that the thrombolysis is injected near a focus in a blood vessel with a pathological change by a catheter, and a high thrombolysis concentration is formed in the focus locally and instantly, so that the thrombolysis speed is increased, and the opportunity of recanalization of the blood vessel is increased. However, the intravenous thrombolysis should be performed within 3 hours of the onset of disease and the time window for arterial thrombolysis is within 6 hours, so that the drug thrombolysis treatment is only applicable to small volumes of thrombus. When the volume of the thrombus is too large, a very large dose is required to dissolve the large blood clot, and various complications are easily caused with high risk. Particularly, the blood vessel recanalization rate of the acute ischemic stroke caused by the most serious large vessel occlusion is low, and the drug thrombolysis is basically ineffective for the thrombus larger than 8 mm.

For the above reasons, the prior art can also adopt mechanical embolectomy to treat ischemic stroke: by delivering the catheter along the blood vessel to the site of the thrombus, negative pressure is directly applied, drawing the thrombus out, allowing the blood vessel to reestablish hemodynamic properties. During interventional treatment of cerebral blood vessels, catheters with soft balloons are often used: through the expansion of sacculus, make the sacculus attached in the vascular wall, block the blood flow temporarily to the protection vessel distal end. Since the typical application sites of the balloon catheter are cerebral arteries, particularly a cavernous sinus segment, a siphon segment, a bone extending segment and an ophthalmic artery segment, and the blood vessels have acute bends and are in tortuous shapes, the balloon catheter has the defects in use that: the tip portion of the tip is short and is not suitable for implementation in tortuous vessels; the distal end of the catheter has a large outer diameter and gradually becomes unable to enter due to the meandering of the cerebral artery in the process of entering the distal end of the cerebral artery.

SUMMERY OF THE UTILITY MODEL

The utility model discloses a plugging balloon catheter with a suction far end, which is used for solving the technical problem that the balloon catheter cannot enter the far end of a tortuous section of a cerebral artery to suck thrombus in the prior art.

In order to solve the problems, the utility model adopts the following technical scheme:

there is provided a distal-end-aspirable occlusion balloon catheter comprising:

-an outer tube, the distal end of which is provided with an expandable or collapsible occlusion element;

-an inner tube fixedly connected at a distal end to the outer tube;

-an aspiration tube disposed within the inner tube, a distal end of the aspiration tube passing out of the inner tube for aspiration of thrombus;

the outer tube, the inner tube and the suction tube are coaxially arranged.

Preferably, the blocking element comprises a balloon, and an annular cavity between the inner tube and the outer tube forms a liquid injection channel of the balloon.

Preferably, the length of the part of the suction pipe penetrating from the inner pipe is as follows: 20-50 mm.

Preferably, the suction tube is in interference fit with the inner tube.

Preferably, the suction tube is slidably inserted into the inner tube with a clearance fit.

Preferably, the inner tube includes an expanded section that is capable of expanding radially inwardly for securing or occluding the evacuation tube when expanded into a transitional or interference fit with the evacuation tube.

Preferably, the expansion section is in the form of a radially inward annular projection in the expanded state.

Preferably, the inner tube includes one of the expansion sections, and the expansion section is disposed at a position corresponding to the balloon in the inner tube.

Preferably, the inner tube includes a plurality of the expanding sections, and the expanding sections are respectively provided at positions near both ends of the balloon in the inner tube, or at positions near both ends and a center of the balloon in the inner tube.

As a preferable technical scheme, the expansion section is provided with a plurality of point-shaped bulges which are inward in the radial direction in the expansion state and are arranged at the positions corresponding to the saccule in the inner tube.

As a preferable technical scheme, the expansion section is in a strip shape and protrudes in an expansion state, and is arranged at a position in the inner tube corresponding to the balloon along the axial direction of the inner tube.

As a preferable technical scheme, the expansion section is made of a soft elastic material, the pressure applied to the liquid injection channel when the expansion section is expanded is a first pressure, the pressure applied to the liquid injection channel when the balloon is expanded is a second pressure, and the first pressure is higher than the second pressure.

Preferably, the elastic coefficient of the expansion section is greater than the elastic coefficient of the balloon.

Preferably, the expansion section satisfies, in the expanded state: the suction tube can be adapted to different outer diameters.

Preferably, the inner tube, the outer tube and the suction tube each have one or more layers.

Preferably, the distal ends of the inner tube and the suction tube are provided with developing marks, and the developing marks are made of X-ray-proof materials.

As a preferred technical scheme, a Y-shaped joint is arranged at the near end of the outer tube, and two connecting ports of the Y-shaped joint are respectively communicated with the liquid injection channel and the tube cavity of the inner tube.

The technical scheme adopted by the utility model can achieve the following beneficial effects:

(1) the utility model provides a plugging balloon catheter with a suction far end, which is compounded with a suction pipe on the basis of the structure of the existing balloon catheter, and the far end of the suction pipe extends out from an inner pipe of the balloon catheter. When the intervention operation of cerebral arterial thrombosis is carried out, the balloon can be expanded at the tortuous section of the cerebral artery, and simultaneously the suction pipe is longer and thinner than the balloon catheter, so that thrombus can be sucked at the small blood vessel at the farther end, and the technical problem that in the prior art, the thrombus cannot be sucked at the farther end of the tortuous section of the cerebral artery because the head end part at the far end of the balloon catheter is very short and has a larger inner diameter is solved.

(2) The suction tube and the inner tube are in clearance fit, so that the suction catheter can slide in the inner tube, the length of the far end of the suction tube penetrating out of the inner tube can be adjusted according to the specific position of thrombus in a blood vessel, and the thrombus can be sucked more conveniently by combining a developing mark and a medical imaging device; meanwhile, an expansion section capable of expanding inwards is further arranged in the inner tube, the elastic coefficient of the expansion section is larger than that of the balloon, when the balloon is expanded and the suction tube reaches the thrombus position, liquid is continuously injected into the balloon catheter, and then the expansion section expands inwards, so that the position of the suction tube is fixed, and the suction tube is prevented from sliding in the thrombus suction process.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced below to form a part of the present invention, and the exemplary embodiments and the description thereof illustrate the present invention and do not constitute a limitation of the present invention. In the drawings:

FIG. 1 is a schematic view of a distal end-aspirable occlusion balloon catheter as disclosed in example 1 of the present invention;

FIG. 2 is a cross-sectional view of a distal end aspirable occlusion balloon catheter as disclosed in example 1 of the present invention;

FIG. 3 is a cross-sectional view of a distal end-suction occlusion balloon catheter as disclosed in example 2 of the present invention;

FIG. 4 is a cross-sectional view of a distal end suction occluding balloon catheter disclosed in example 2 of the present invention after balloon inflation;

FIG. 5 is a cross-sectional view of the disclosed distal end smokable occlusion balloon catheter after balloon and dilating segments have been inflated in accordance with example 2 of the present invention;

fig. 6 is a diagram of the use state of the distal end suction plugging balloon catheter disclosed in the embodiments 1 and 2 of the utility model in cerebral arteries.

The following reference signs are specifically included:

the device comprises an outer tube 1, a balloon 2, an inner tube 3, an expansion section 31, an injection channel 4, a suction tube 5, a developing mark 6, a Y-shaped joint 7, a cerebral artery 8, a tortuous section 81 and a thrombus 9.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be clearly and completely described below with reference to the specific embodiments of the present invention and the accompanying drawings. In the description of the present invention, it is noted that the term "or" is generally employed in its sense including "and/or" unless the content clearly dictates otherwise.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; 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.

It is to be understood that the described embodiments are merely exemplary of the utility model, and not restrictive of the full scope of the utility model. 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.

To solve the problems in the prior art, embodiments of the present application provide a distal-end-suction occlusion balloon catheter, including: the far end of the outer tube is provided with a balloon which can be inflated or collapsed; the inner tube and the outer tube are fixedly connected at the far end, and an annular cavity between the inner tube and the outer tube forms a liquid injection channel of the balloon; the distal end of the suction pipe penetrates out of the inner tube and is used for sucking thrombus; the outer tube, the inner tube and the suction tube are coaxially arranged.

Example 1

In view of the above, in the prior art, when the mechanical embolectomy is used for the interventional treatment of ischemic stroke, the tip portion of the distal end of the balloon catheter is short, and is not suitable for the treatment in a tortuous cerebral artery vessel, and the distal end has a large outer diameter, and thus the distal end gradually becomes unable to enter due to the tortuosity of the cerebral artery during the process of entering the distal end of the cerebral artery. In order to solve the above problem, in this embodiment 1, a distal end-suction occlusion balloon catheter is provided, in which a coaxial suction tube is provided, and when an intervention operation for ischemic stroke is performed, the balloon can be inflated at a tortuous section of a cerebral artery, and the suction tube is longer and thinner than the balloon catheter, so that thrombus can be sucked in a small blood vessel at a distal end, thereby solving the technical problem that in the prior art, thrombus suction cannot be performed at a distal end of a tortuous section of a cerebral artery due to a short distal end portion of the balloon catheter and a large inner diameter.

Referring to fig. 1 and 2, in a preferred embodiment, a distal end suction occlusion balloon catheter is provided, which comprises an outer tube 1, an inner tube 3 and a suction tube 5, which are coaxially arranged, and all of which are flexible catheters; the far end of the outer tube 1 is provided with a balloon 2 which can be inflated or collapsed, an annular cavity between the outer tube 1 and the inner tube 3 forms a liquid injection channel 4 of the balloon 2, and the balloon 2 is expanded to be attached to the vessel wall of a cerebral artery 8 to form local plugging; the suction tube 5 is arranged in the inner tube 3 in a penetrating way, the two are in transition fit or interference fit and are relatively fixed, and the far end of the suction tube 5 penetrates out of the inner tube 3 to be used as a suction section and can reach a farther position for sucking thrombus.

Preferably, the length of the suction pipe 5 is in the range of 20-50mm, so as to ensure that the suction pipe can deal with the complicated and tortuous cerebral artery 8 blood vessel and smoothly reach the position where the thrombus 9 occurs for suction, as shown in fig. 6; the outer diameter of the suction tube 5 is matched with the specification of the balloon catheter, so that the thrombus removal failure caused by slippage of the suction tube 5 in the suction process is prevented; in one embodiment, the outer diameter of the suction tube 5 is slightly larger than the inner diameter of the inner tube 3 to maintain the two in transition fit state and avoid slippage; in another embodiment, the outer diameter of the suction tube 5 is the same as the inner diameter of the inner tube 3, and the two are secured to each other by gluing or welding to avoid slippage during the procedure. In a preferred embodiment, the outer diameter of the draft tube 5 is 2.00mm (6F), the inner diameter is 1.83mm, and the outer diameter of the outer tube 1 is 6-8F. Since the diameters of the cerebral artery 8 vessels are different for different patients or different diseased regions of the same patient, it can be understood by those skilled in the art that the sizes and specifications of the suction tube 5, the inner tube 3 and the outer tube 1 can be changed adaptively according to the condition of the patient, for example, the specific length of the suction section can be set according to the actual distance between the meandering section 81 and the thrombus 9.

In a preferred embodiment, the diameter of the vessel distal to the cerebral artery 8 is gradually reduced, so that the outer diameter of the suction section is gradually reduced from the proximal end to the distal end, thereby ensuring that the suction tube 5 can reach a position further away for suction.

Preferably, the balloon 2 has an expanded outer diameter of 6.00mm and a length of 10.00mm, and the balloon 2 is used for sealing off the blood vessel of the tortuous segment 81 of the cerebral artery 8 after being expanded, so that the blood vessel at the position has a small diameter and a large tortuous angle, and the balloon 2 with an over-large specification is not suitable for ensuring the trafficability of the suction tube 5 and the safety of the operation; the balloon 2 is made of silicon rubber or polyether block polyamide or polyurethane PU or natural latex, so that the balloon has small damage to blood vessels and good sealing performance and requires low pressure. Further, the working length of the outer tube 1 is 1200-1300mm, a Y-joint 7 is arranged at the proximal end of the outer tube 1, as shown in fig. 1, two connecting ports of the Y-joint 7 are respectively communicated with the liquid injection channel 4 and the lumen of the inner tube 3, and a stress buffer is arranged at the connecting position of the Y-joint 7 and the outer tube 1.

Further, the inner tube 3, the outer tube 1 and the suction tube 5 are all of a multi-layer structure, preferably a 3-layer structure, specifically, the outer layer can be made of polyether block polyamide, nylon or polyurethane PU, the middle layer can be made of a spring net or a woven net, and the inner layer is made of polytetrafluoroethylene PTFE or high density polyethylene HDPE or PEBA mixed with a friction coefficient reducing additive. The multilayer structure and the multiple materials provide better pushability and kink resistance with less impact on wall thickness.

Further, visualization marks 6 are provided at a plurality of positions for occluding the balloon catheter, for example, visualization marks 6 made of an opaque material X are provided at the distal ends of the inner tube 3 and the suction tube 5 for assisting the physician in monitoring the site of inflation and the site of suction of the balloon 2; in a preferred trial mode, the development indicia 6 is an X-ray opaque material such as platinum or platinum iridium or gold or tantalum or tungsten to provide good visibility.

In this embodiment 1, the occlusion balloon catheter is used as follows:

referring to fig. 6, under the monitoring of advanced medical imaging equipment, a catheter sheath is inserted through percutaneous puncture, a guide wire is sent to a designated position of a cerebral artery 8 along the catheter sheath, then the blocking balloon catheter of the present invention is sent along the guide wire, liquid is injected after a balloon 2 reaches a tortuous section 81 of the cerebral artery 8 so as to expand and attach to a blood vessel wall, a local block is formed to temporarily block blood flow, thrombus suction is performed to achieve the purpose of blood flow reconstruction, and after an operation is completed, the blocking balloon catheter is retracted and withdrawn from a body together with other instruments.

Example 2

As shown in fig. 1, 3-6, this embodiment provides an occlusion balloon catheter with a distal end capable of sucking, and based on the structure of embodiment 1, the suction tube 5 and the inner tube 3 are changed into a clearance fit, a gap exists between the two, the suction tube 5 is slidably inserted into the inner tube 3, when the balloon 2 enters the tortuous section 81 of the cerebral artery 8 and is expanded to occlude the blood vessel during the interventional operation, the suction tube 5 can be further advanced or retracted according to the specific position of the thrombus 9 to suck the thrombus 9.

Preferably, as shown in fig. 3, the outer diameter of the suction tube 5 is slightly smaller than the inner diameter of the inner tube 3, so as to ensure the relative sliding; the inner tube 3 is provided with an expansion section 31 capable of expanding radially inwards, fig. 5, to secure the suction tube 5 against slipping or to close it; further, the expanding section 31 is made of a soft elastic material; recording the pressure applied to the liquid injection channel when the expansion section expands as a first pressure, and recording the pressure applied to the liquid injection channel when the balloon expands as a second pressure, wherein the first pressure is greater than the second pressure, so that the balloon 2 expands before the expansion section 31; preferably, the elastic modulus of the material of the expansion section 31 is greater than that of the material of the balloon 2, so that when a liquid is injected into the liquid injection channel 4 by using a syringe, the balloon 2 can expand and block the blood vessel in advance, as shown in fig. 4, and after the distal end of the suction tube 5 is close to the thrombus 9, the liquid is injected continuously, so that the expansion section 31 of the inner tube 3 is expanded inwards and fixed, as shown in fig. 5. Preferably, when the balloon 2 is made of polyurethane PU, the expansion section 31 may be made of silicon rubber or natural latex; when the balloon 2 is made of silicon rubber, the material of the expansion section 31 can be natural latex. In another embodiment, the material of the dilating segments 31 is the same as that of the balloon 2, but the coefficient of elasticity of the dilating segments 31 is greater than that of the balloon 2 by changing the area of inflation thereof to ensure that the balloon 2 inflates before the dilating segments 31.

Referring to fig. 5, in a preferred embodiment, the expanding segments 31 are annular protrusions radially inward in the expanded state, and the number may be 1, 2 or more than 2. When the number of the expanding sections 31 having the annular protrusions is 1, the length of the expanding sections 31 may be the same as or slightly shorter than the length of the balloon 2, and is preferably set at a position corresponding to the balloon 2 in the inner tube 3, and more preferably set at a position near the distal end of the balloon 2 in the inner tube 3. When the number of the expanding sections 31 which are in the shape of the annular protrusion is 2, the length of the expanding sections 31 is far less than that of the balloon 2, and the expanding sections are preferably arranged in the inner tube 3 at positions close to the two ends of the balloon 2, so that a better fixing effect is provided. When the number of the expanding sections 31 protruding in the shape of the ring is more than 2, the length of the expanding sections 31 is much shorter than the length of the balloon 2, and the expanding sections can be discretely arranged in the inner tube 3 at positions corresponding to the balloon 2, preferably at positions close to the two ends and the center of the balloon 2 in the inner tube 3, so as to fix the suction tube 5 better.

In another embodiment, the expansion segment 31 is a point-like protrusion radially inward in the expanded state, and extends over the inner tube 3 at a position corresponding to the balloon 2, so as to provide greater frictional resistance and avoid slippage of the suction tube 5.

In other embodiments, the expansion section 31 is a plurality of strip-shaped protrusions arranged in the axial direction of the inner tube 3 and corresponding to the balloon 2, and the strip-shaped protrusions are preferably arranged in the inner tube 3 and have the same length as or slightly shorter than the balloon 2, so as to better fix the suction tube 5.

In this embodiment 2, the occlusion balloon catheter is used as follows:

referring to fig. 4-6, under the monitoring of advanced medical imaging equipment, a catheter sheath is inserted through percutaneous puncture, a guide wire is sent to a designated position of a cerebral artery 8 along the catheter sheath, then the blocking balloon catheter of the present invention is sent along the guide wire, after a balloon 2 reaches a tortuous section 81 of the cerebral artery 8, liquid is injected to expand and attach to a vessel wall, so as to form a local block for temporarily blocking blood flow, as shown in fig. 4, the suction tube 5 is continuously advanced or retracted under the monitoring of imaging equipment, and after reaching the vessel position, liquid is continuously injected, so that the expansion section 31 of the inner tube 3 is expanded inwards to fix the suction tube 5 and perform thrombus suction, as shown in fig. 5, after the operation is completed, the blocking balloon catheter is retracted together with other instruments, and is withdrawn from the body.

Example 3

In a medical scenario, patients have different ages, sexes, heights, weights, lesion positions, lesion conditions and the like, and therefore cerebral arteries of patients may have different shapes and/or sizes, in this embodiment, based on the structure of embodiment 2, a medical device for interventional therapy of ischemic stroke is provided, which provides a plurality of outer tubes 1, balloons 2, inner tubes 3 and suction tubes 5 of different specifications under the condition that the suction tube 5 and the balloon catheter are detachably connected, and a doctor selects the suction tube 5 and the balloon catheter of the proper specification/size to combine for interventional therapy according to the actual physiological and pathological conditions of the patients.

In this embodiment, specific features of the outer tube 1, the balloon 2, the inner tube 3, and the suction tube 5 are described in reference to embodiments 1 and 2, and will not be described herein again.

The utility model has the following advantages:

(1) the utility model provides a plugging balloon catheter with a suction far end, which is compounded with a suction pipe on the basis of the structure of the existing balloon catheter, and the far end of the suction pipe extends out from an inner pipe of the balloon catheter. When the intervention operation of cerebral arterial thrombosis is carried out, the balloon can be expanded at the tortuous section of the cerebral artery, and simultaneously the suction pipe is longer and thinner than the balloon catheter, so that thrombus can be sucked at the small blood vessel at the farther end, and the technical problem that in the prior art, the thrombus cannot be sucked at the farther end of the tortuous section of the cerebral artery because the head end part at the far end of the balloon catheter is very short and has a larger inner diameter is solved.

(2) The suction tube and the inner tube are in clearance fit, so that the suction catheter can slide in the inner tube, the length of the far end of the suction tube penetrating out of the inner tube can be adjusted according to the specific position of thrombus in a blood vessel, and the thrombus can be sucked more conveniently by combining a developing mark and a medical imaging device; simultaneously, still set up the expansion section that can inwards expand in the inner tube, and the elastic coefficient of this expansion section is greater than the elastic coefficient of sacculus, and after the sacculus inflation and suction tube reached the thrombus position, continue to pour into liquid into the sacculus pipe, then the expansion section is inwards expanded to the position of fixed suction tube prevents its slip in thrombus suction process, is showing the success rate that has improved cerebral artery thrombus suction.

While the present invention has been described with reference to the embodiments shown in the drawings, the present invention is not limited to the embodiments, which are illustrative and not restrictive, and it will be apparent to those skilled in the art that various changes and modifications can be made therein without departing from the spirit and scope of the utility model as defined in the appended claims.

Claims (17)

1. A distal-end-aspirable occlusion balloon catheter, comprising:

-an outer tube, the distal end of which is provided with an expandable or collapsible occlusion element;

-an inner tube fixedly connected at a distal end to the outer tube;

-an aspiration tube disposed within the inner tube, a distal end of the aspiration tube passing out of the inner tube for aspiration of thrombus;

the outer tube, the inner tube and the suction tube are coaxially arranged.

2. The occlusion balloon catheter of claim 1, wherein the occlusion element comprises a balloon, and an annular cavity between the inner tube and the outer tube constitutes a fluid injection channel of the balloon.

3. The occlusion balloon catheter of claim 1, wherein the portion of the suction tube that exits the inner tube has a length of 20-50 mm.

4. The occlusion balloon catheter of claim 3, wherein the suction tube is an interference fit with the inner tube.

5. The occlusion balloon catheter of claim 2, wherein the suction tube is slidably disposed through the inner tube with a clearance fit.

6. The occlusion balloon catheter of claim 5, wherein the inner tube comprises an expanded section that is expandable radially inward for securing or occluding the suction tube when expanded into a transitional or interference fit with the suction tube.

7. The occlusion balloon catheter of claim 6, wherein the expanded section presents a radially inward annular bulge in the expanded state.

8. The occlusion balloon catheter of claim 7, wherein the inner tube comprises one of the expanded sections, the expanded section being disposed in the inner tube at a location corresponding to the balloon.

9. The occlusion balloon catheter of claim 7, wherein the inner tube comprises a plurality of the expanded segments, the expanded segments being disposed at positions in the inner tube near both ends of the balloon, or at positions in the inner tube near both ends and a center of the balloon, respectively.

10. The occlusion balloon catheter of claim 6, wherein the dilating segments are disposed in the inner tube at a position corresponding to the balloon in an expanded state as a plurality of point-like protrusions radially inward.

11. The occlusion balloon catheter of claim 6, wherein the dilating segments are raised in the form of a strip in the expanded state and are disposed in the inner tube at a position corresponding to the balloon along the axial direction of the inner tube.

12. The occlusion balloon catheter of any of claims 6-11, wherein the dilating segments are made of a soft, resilient material; the pressure intensity borne by the liquid injection channel is a first pressure intensity when the expansion section is expanded, the pressure intensity borne by the liquid injection channel is a second pressure intensity when the saccule is expanded, and the first pressure intensity is larger than the second pressure intensity.

13. The occlusion balloon catheter of claim 12, wherein the coefficient of elasticity of the expanded section is greater than the coefficient of elasticity of the balloon.

14. The occlusion balloon catheter of claim 13, wherein the expanded section, in an expanded state, satisfies: the suction tube can be adapted to different outer diameters.

15. The occlusion balloon catheter of claim 1, wherein the inner tube, the outer tube, and the suction tube each have one or more layers of structure.

16. The occlusion balloon catheter of claim 1, wherein the distal ends of the inner tube and the suction tube are each provided with a visualization marker, the visualization marker being an X-ray opaque material.

17. The occlusion balloon catheter of claim 2, wherein a Y-shaped joint is arranged at the proximal end of the outer tube, and two connection ports of the Y-shaped joint are respectively communicated with the liquid injection channel and the lumen of the inner tube.

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