CN218961563U - Single-cavity tract balloon catheter - Google Patents

Abstract

The utility model relates to a single-cavity-channel balloon catheter, which comprises a single-cavity tube and a lining rod, wherein a cavity channel is formed in the single-cavity tube along the axial direction of the single-cavity tube, a balloon communicated with the cavity channel is arranged on the single-cavity tube, the lining rod can be movably arranged in the cavity channel along the axial direction of the single-cavity tube, a first port for controlling the position of the lining rod and a second port for injecting liquid into the cavity channel to expand the balloon are arranged at one end of the single-cavity tube, and a tip part is formed at the other end of the single-cavity tube; pushing the liner rod inwardly to move it within the lumen to a position near the tip portion; the liner rod is pulled outwardly to move it within the lumen in a first mouth direction to a position away from the tip portion. The balloon catheter has better control performance and passing performance, improves the convenience of balloon conveying and the positioning accuracy, and effectively improves the success rate of clinical operation.

Description

Single-cavity tract balloon catheter

Technical Field

The utility model relates to the technical field of medical instruments, in particular to a single-lumen balloon catheter.

Background

Currently, there is an increasing number of treatments for various diseases by introducing balloon catheters into the rectal, uterine, biliary, urinary, articular, ventricular, pharyngeal cavities of patients. When the balloon catheter is used for treating the diseases in the cavity, the accurate positioning and the accurate expansion of the target lesion part are very important, and the most common method is to perform visual positioning and expansion operation treatment under an endoscope. The most commonly used endoscopes in clinic comprise a laparoscope, a cystoscope, a hysteroscope, an arthroscope, a ventriculoscope and the like, the endoscopes are divided into a hard scope and a soft scope, an operator firstly conveys the endoscopes to the vicinity of a lesion part during treatment, conveys the instruments to the far end of an instrument channel through an instrument operation channel after observing the lesion, and pushes the instruments out of the instrument channel to be continuously conveyed to the far-end lesion part. But endoscopes can provide instrument channels with smaller outer diameters that can only be used as delivery channels for small diameter instruments such as bioptomes, injection needles, and the like.

The balloon catheter used clinically is divided into a multi-cavity (or multi-cavity) balloon catheter and a single-cavity balloon catheter, and the multi-cavity (or multi-cavity) balloon catheter is matched with a guide wire for use in clinical application, so that the multi-cavity (or multi-cavity) balloon catheter has better tracking performance and control performance, but the multi-cavity (or multi-cavity) balloon catheter cannot be conveyed through an instrument channel of an endoscope due to larger outer diameter of a rod body, so that a guide wire guide parallel insertion method is adopted for conveying and positioning, namely the endoscope and the balloon catheter are conveyed in a parallel insertion mode under the guide of the guide wire. The single-lumen balloon catheter can enter an endoscopic instrument channel due to the single rod body structural design, and the outer diameter of the rod body is smaller, but the single rod body structural design causes weaker distal end operability and trafficability, so that the use effect is irrational.

Accordingly, the present inventors have developed a single lumen balloon catheter to overcome the shortcomings of the prior art by years of experience and practice in the relevant industry.

Disclosure of Invention

The utility model aims to provide a single-lumen balloon catheter which can be conveyed to a lesion part of a patient through a mechanical channel of a conventional endoscope, and the operability and the passing performance of the distal end of the balloon catheter can be improved through a coaxial gradually-adjustable lining rod arranged in the balloon catheter, so that the single-lumen balloon catheter has excellent clinical application value.

The purpose of the utility model can be realized by adopting the following technical scheme:

the utility model provides a single-lumen balloon catheter, which comprises a single-lumen tube and a lining rod, wherein a lumen is formed in the single-lumen tube along the axial direction of the single-lumen tube, a balloon communicated with the lumen is arranged on the single-lumen tube, the lining rod can be movably arranged in the lumen along the axial direction of the single-lumen tube, a first port for controlling the position of the lining rod and a second port for injecting liquid into the lumen to expand the balloon are arranged at one end of the single-lumen tube, and a tip part is formed at the other end of the single-lumen tube;

pushing the liner rod inwardly to move it within the lumen to a position proximate the tip portion;

the liner rod is pulled outwardly to move it within the lumen toward the first port to a position away from the tip portion.

In a preferred embodiment of the present utility model, the balloon is disposed on the single lumen and near the tip portion, the interior of the balloon is in communication with the lumen, and a liquid is injected into the lumen to expand the balloon.

In a preferred embodiment of the present utility model, the single lumen tube passes through the balloon, and at least one liquid inlet hole communicating the lumen with the interior of the balloon is formed in the single lumen tube, so that the liquid injected into the lumen enters the interior of the balloon.

In a preferred embodiment of the present utility model, the balloon includes an expansion section in an axial direction of the single lumen tube, and first and second ends located at both sides of the expansion section, the balloon is connected to the single lumen tube through the first and second ends, and only the expansion section is in an expanded state when the liquid is injected into the balloon.

In a preferred embodiment of the utility model, the surface of the expansion section or a partial region of the surface of the expansion section is coated with a drug layer.

In a preferred embodiment of the present utility model, the single-lumen tube includes a first single-lumen tube section, a second single-lumen tube section and a third single-lumen tube section sequentially along an axial direction thereof, the first port and the second port are both located at one end of the first single-lumen tube section, the other end of the first single-lumen tube section is connected with one end of the second single-lumen tube section, the other end of the second single-lumen tube section is connected with one end of the third single-lumen tube section, the tip portion is located at the other end of the third single-lumen tube section, and the hardness of the first single-lumen tube section and the hardness of the second single-lumen tube section are greater than those of the third single-lumen tube section;

the balloon is located on the second single lumen segment and on a side remote from the first single lumen segment.

In a preferred embodiment of the present utility model, the third single lumen segment has an axial length along the single lumen tube of 3mm to 50mm.

In a preferred embodiment of the present utility model, the third single lumen segment has an axial length along the single lumen tube of 15mm to 50mm.

In a preferred embodiment of the present utility model, the tip portion has a sealed circular arc structure.

In a preferred embodiment of the present utility model, the lining rod comprises a first lining rod section far from the tip end and a second lining rod section near to the tip end, wherein the first lining rod section is a straight rod-shaped structure extending along the axial direction of the single-cavity tube;

the second lining rod section comprises a reducing section and a straight section, one end of the reducing section is connected with the first lining rod section, the other end of the reducing section is connected with the straight section, and the reducing section is of a conical rod-shaped structure with gradually reduced radius from the tip end to the direction close to the tip end.

In a preferred embodiment of the present utility model, the flat section is provided with a developing wire.

In a preferred embodiment of the present utility model, the developing wire is spirally wound and fixed on the straight section.

In a preferred embodiment of the present utility model, the Shan Qiang balloon catheter includes a handle connected to the single lumen tube at an end remote from the tip portion, the first port and the second port are both located on the handle, and the first port, the single lumen tube and the liner rod are all coaxially disposed.

In a preferred embodiment of the present utility model, a lining rod base capable of sealing and blocking the first port is disposed at the first port, and one end of the lining rod, which is far away from the tip portion, is connected with the lining rod base.

From the above, the single-lumen balloon catheter has the characteristics and advantages that: the inner lining rod capable of moving along the axial direction of the single-cavity tube is arranged in the inner cavity channel of the single-cavity tube, the position of the inner lining rod in the cavity channel can be adjusted in the use process, when the balloon catheter needs to pass through the bent and narrow human cavity channel position, the inner lining rod can be pulled outwards, so that the balloon catheter moves inwards in the cavity channel to be far away from the tip end part of the single-cavity tube, the bending and deformation capacity of the far end of the single-cavity tube is improved, the success rate of the balloon catheter in smoothly passing through the bent and narrow position is improved, and the damage to the human cavity channel is reduced; after the balloon catheter accurately positions the lesion site, the lining rod can be pushed inwards so as to move in the cavity to be close to the tip part of the single-cavity tube, so that the support performance of the balloon catheter in the expanded state is improved, and a good treatment effect is achieved. The single-lumen balloon catheter is provided with only one lumen, can be conveyed to a lesion part of a patient through a mechanical channel of a conventional endoscope, and has excellent clinical application value due to the arrangement of the movable lining rod, so that the operability and the passing performance of the distal end of the balloon catheter are improved.

Drawings

The following drawings are only for purposes of illustration and explanation of the present utility model and are not intended to limit the scope of the utility model. Wherein:

fig. 1: is a structural schematic diagram of the single-cavity balloon catheter.

Fig. 2: is a schematic structural diagram of a lining rod in the single-cavity balloon catheter.

Fig. 3: schematic diagram of the arrangement position of the developing wire in the single-lumen balloon catheter.

Fig. 4: is a schematic structural diagram of a developing wire in the single-cavity balloon catheter.

Fig. 5: is one of the structural schematic diagrams of the balloon in the single-lumen balloon catheter.

Fig. 6: is a second schematic diagram of the structure of the balloon in the single-lumen balloon catheter.

Fig. 7: is the third schematic diagram of the balloon in the single-lumen balloon catheter.

The reference numerals in the utility model are:

1. a balloon; 101. An expansion section;

102. a first end; 103. A second end;

2. a single lumen tube; 201. A first single lumen segment;

202. a second single lumen segment; 203. A third single lumen segment;

204. a tip portion; 205. A cavity channel;

206. a liquid inlet hole; 3. A lining rod;

301. a first liner rod section; 302. A second liner rod section;

3021. a reducing section; 3022. A straight section;

303. developing wires; 304. A lining rod base;

4. a handle; 401. A first port;

402. a second port.

Detailed Description

For a clearer understanding of technical features, objects, and effects of the present utility model, a specific embodiment of the present utility model will be described with reference to the accompanying drawings.

As shown in fig. 1, the present utility model provides a single-lumen balloon catheter, which comprises a single-lumen tube 2 and a lining rod 3, wherein a lumen 205 is formed inside the single-lumen tube 2 along the axial direction of the single-lumen tube 2, a balloon 1 communicated with the lumen 205 is arranged on the single-lumen tube 2, the lining rod 3 can be movably arranged in the lumen 205 along the axial direction of the single-lumen tube 2, one end of the single-lumen tube 2 is provided with a first port 401 and a second port 402, the position of the lining rod 3 in the lumen 205 can be controlled through the first port 401, liquid can be injected into the lumen 205 through the second port 402 to expand the balloon 1, the surface of the balloon 1 is contacted with a lesion part of a patient, so that the purpose of treating the lesion part is achieved, and the other end of the single-lumen tube 2 is provided with a tip 204; pushing the liner rod 3 inwardly to move the liner rod 3 within the channel 205 to a position near the tip end 204; the liner rod 3 is pulled outwardly to move the liner rod 3 within the channel 205 in the direction of the first port 401 to a position away from the tip portion 204.

The inner lining rod 3 capable of moving along the axial direction of the single-cavity tube 2 is arranged in the inner cavity channel 205 of the single-cavity tube 2, the position of the inner lining rod 3 in the cavity channel 205 can be adjusted in the use process, when a balloon catheter needs to pass through a bent and narrow human cavity channel, the inner lining rod 3 can be pulled outwards, so that the inner lining rod moves in the cavity channel 205 to a tip end 204 far away from the single-cavity tube 2, the bending and deformation capacity of the far end of the single-cavity tube 2 is improved, the success rate of the balloon catheter in smoothly passing through the bent and narrow position is improved, and the damage to the human cavity channel is reduced; after the balloon catheter accurately positions the lesion site, the lining rod 3 can be pushed inwards so as to move in the cavity 205 to be close to the tip end 204 of the single-cavity tube 2, so that the support performance of the balloon 1 in the expanded state is improved, and a good treatment effect is achieved. The single-lumen balloon catheter is provided with only one lumen 205, and can be conveyed to a lesion site of a patient through a mechanical channel of a conventional endoscope, and the arrangement of the movable lining rod 3 improves the operability and the passing performance of the distal end of the balloon catheter, so that the single-lumen balloon catheter has excellent clinical application value.

In an alternative embodiment of the present utility model, as shown in fig. 1, the balloon 1 is disposed on the single lumen tube 2 and near the tip portion 204, the interior of the balloon 1 is communicated with the lumen 205, and the liquid is injected into the lumen 205 through the second port 402, so that the balloon 1 can be inflated and expanded.

Further, as shown in fig. 1, the single lumen 2 passes through the balloon 1, and at least one liquid inlet 206 is formed on the single lumen 2 at a position opposite to the balloon 1, and the lumen 205 is communicated with the interior of the balloon 1 through the liquid inlet 206, so that the liquid injected into the lumen 205 enters the interior of the balloon 1 through the liquid inlet 206. Of course, a plurality of liquid inlets 206 can be arranged according to practical situations, and the opening positions of the liquid inlets 206 are adjusted, so that the inside of the balloon 1 can be uniformly and stably filled with the liquid through the communication between the cavity 205 and the inside of the balloon 1, and the specific number and positions of the liquid inlets 206 are not limited.

Further, as shown in fig. 1, the balloon 1 comprises an expansion section 101 and a first end 102 and a second end 103 positioned at two sides of the expansion section 101 in the axial direction of the single-lumen tube 2, the balloon 1 is connected with the single-lumen tube 2 through the first end 102 and the second end 103, when the liquid is injected into the balloon 1, only the expansion section 101 is in an expansion state in the expansion section 101, and the pressure born by the expansion section 101 is greater than or equal to 3atm; the first end 102 and the second end 103 do not undergo significant expansive deformation.

In an alternative embodiment of the utility model, the surface of the expansion segment 101 or a partial region of the surface of the expansion segment 101 is coated with a layer of drug in order to provide targeted drug to the lesion for treatment.

In an alternative embodiment of the present utility model, the balloon 1 may be made of a single layer of polymer material. The single-layer high polymer material can be, but is not limited to, one of silica gel, silicone rubber, polyurethane, PVC, polyether polyamide copolymer, nylon or modified nylon, or a combination of the above materials.

In another alternative embodiment of the utility model, the balloon 1 may be made of multiple layers of hard materials. Wherein the hard material may be, but is not limited to, at least two of silicone rubber, polyurethane, PVC, polyether polyamide copolymer, nylon, and modified nylon, the different hard materials being made in a laminated structure.

In an alternative embodiment of the present utility model, as shown in fig. 5-7, the shape of balloon 1 (or balloon 1 in the inflated state) may be, but is not limited to, cylindrical or tapered. Of course, the balloon 1 may also have other shaped columnar structures (such as dumbbell-shaped structures with large diameters at both ends and small diameters in the middle in fig. 7) in the inflated state, and the specific shape of the balloon 1 is not limited herein.

In an alternative embodiment of the present utility model, as shown in fig. 1, the single lumen tube 2 includes a first single lumen tube segment 201, a second single lumen tube segment 202, and a third single lumen tube segment 203 in this order along the axial direction thereof, the first port 401 and the second port 402 are located at one end (proximal end) of the first single lumen tube segment 201, the other end (distal end) of the first single lumen tube segment 201 is connected to one end (proximal end) of the second single lumen tube segment 202, the other end (distal end) of the second single lumen tube segment 202 is connected to one end (proximal end) of the third single lumen tube segment 203, the tip 204 is located at the other end (distal end) of the third single lumen tube segment 203, and the balloon 1 is located on the second single lumen tube segment 202 and on the side away from the first single lumen tube segment 201. The hardness of the first single-lumen segment 201 and the hardness of the second single-lumen segment 202 are greater than the hardness of the third single-lumen segment 203, and the third single-lumen segment 203 and the tip portion 204 are regulated and controlled and provide substantial mechanical support during surgery by mechanical manipulation (including rotation, bending, pulling, etc.) of the first single-lumen segment 201 and the second single-lumen segment 202. Wherein the proximal end is the end close to the operator, and the distal end is the end far away from the operator.

In an alternative embodiment of the present utility model, the single lumen tube 2 is made of medical plastic, and the hardness of the single lumen tube 2 is greater than or equal to 70D when the single lumen tube 2 is made of medical plastic. Wherein the medical plastic may be, but is not limited to, one of a hard nylon, nylon/fiber copolymer or blend, polyetheretherketone, polyoxymethylene resin, high density polyethylene or high density polypropylene, or a combination of the foregoing.

In an alternative embodiment of the present utility model, the single lumen tube 2 is made of a medical grade metallic material. Wherein the medical metal material may be, but is not limited to, stainless steel or alloy material.

Furthermore, the single-cavity tube 2 can also be made of a combination of medical plastic and metal materials, so that the hardness of the single-cavity tube 2 can be further improved. The medical plastic and the metal material can be connected in a sectional combination mode, or the medical plastic layer is covered on the surface of the metal material layer in a lamination mode.

Further, in the first single-cavity pipe section 201, the second single-cavity pipe section 202 and the third single-cavity pipe section 203, at least the third single-cavity pipe section 203 is made of medical plastic, so that the hardness of the third single-cavity pipe section 203 is smaller than that of the first single-cavity pipe section 201 and the second single-cavity pipe section 202, the third single-cavity pipe section 203 has better bending performance, can adapt to a cavity structure of complex bending of a human body, and ensures that the balloon catheter has better cavity bending and tracking performance.

Wherein the third single lumen segment 203 is made of a medical grade plastic, which may be, but is not limited to, a polyether polyamide copolymer, nylon or modified nylon, or a combination thereof.

In an alternative embodiment of the utility model, the third single lumen segment 203 is 3mm to 50mm in axial length along the single lumen tube 2. Wherein the preferred third single lumen segment 203 has an axial length along the single lumen tube 2 of 15mm to 50mm. The balloon catheter is ensured to adapt to the bending angles of different human body channels, the object protruding from the surface of the channel is subjected to rapid deformation feedback, the success rate of the operation process in one-time passing through the bent narrow channel is improved, and the damage to the channel mucosa caused by repeated passing is reduced.

In an alternative embodiment of the present utility model, the tip 204 has a sealed circular arc structure, so as to effectively reduce the damage to the mucosa of the human body cavity during the process of delivering the balloon catheter in the human body cavity.

In an alternative embodiment of the present utility model, as shown in fig. 1 to 3, the liner rod 3 includes a first liner rod section 301 far from the tip end 204 and a second liner rod section 302 near the tip end 204, the first liner rod section 301 being a straight rod-like structure extending in the axial direction of the single lumen tube 2; the second liner rod section 302 further includes a reducing section 3021 and a straight section 3022, wherein one end of the reducing section 3021 is connected to the first liner rod section 301, the other end of the reducing section 3021 is connected to the straight section 3022, and the reducing section 3021 has a tapered rod-shaped structure with a radius gradually decreasing from the distal end 204 to the proximal end 204. The design of the first lining rod section 301 can greatly improve the mechanical feedback performance and the torque transmission performance of the single-cavity tube 2 at the position close to the tip end 204; the design of the reducing section 3021 and the straight section 3022 can improve the rebound resilience performance of the single-lumen tube 2 near the tip 204, and meanwhile, the gradually-changed conical straight rod structure can effectively ensure the flexibility and the bending performance of the single-lumen tube 2 near the tip 204, so that the single-lumen tube 2 near the tip 204 can rebound and reset rapidly after encountering a narrow convex obstacle to deform in a human body bending cavity, the shape change and the convex obstacle of the human body cavity can be adapted rapidly, and the tracking performance and the passing performance of the single-lumen tube 2 near the tip 204 along the cavity anatomy structure in the complex bending human body cavity are greatly improved.

Further, the lining rod 3 may be made of an alloy material having excellent rebound performance. Among them, preferred materials are nickel alloy, titanium alloy or mixed metal materials containing both nickel and titanium.

In an alternative embodiment of the present utility model, as shown in fig. 1, 3 and 4, the developing wire 303 is disposed on the straight section 3022, and the developing wire 303 has excellent developing performance under X-rays. According to the mechanical feedback of the position of the single-cavity tube 2 close to the tip 204 in the clinical conveying operation process, the mechanical property of the position of the single-cavity tube 2 close to the tip 204 can be adjusted by pulling back and pushing forward the relative position of the lining rod 3 from the single-cavity tube 2 to the tip 204, so that the position of the single-cavity tube 2 close to the tip 204 can be ensured to keep excellent tracking performance and passing performance. The developing wire 303 plays an important role in the position adjustment process of the lining rod 3, and the position of the lining rod 3 can be accurately confirmed through the developing wire 303, so that the success rate of clinical operation is improved.

Further, as shown in fig. 4, the developing wire 303 is wound around the straight section 3022 in a single spiral structure or a multiple spiral structure, and the developing wire 303 and the lining rod 3 are integrally fixed by welding or bonding. The developing wire 303 is of a single-spiral structure, so that the flexibility and bending performance of the developing wire 303 can be improved to the greatest extent, meanwhile, the developing wire 303 is wound and fixed on the straight section 3022 of the lining rod 3, the mechanical transition of the reducing section 3021 of the lining rod 3 can be met to the greatest extent, the flexibility and rebound resilience performance of the straight section 3022 of the lining rod 3 are guaranteed to the greatest extent, and the optimal flexibility and rebound resilience performance of the distal section of the single-cavity tube 2 according to the appearance of human body cavity lesions are guaranteed to the greatest extent.

In an alternative embodiment of the present utility model, as shown in fig. 1, the single lumen balloon catheter includes a handle 4, the handle 4 being connected to the single lumen tube 2 at an end remote from the tip portion 204, and both the first port 401 and the second port 402 being located on the handle 4.

Further, as shown in fig. 1, the first port 401, the single-lumen tube 2 and the lining rod 3 are all coaxially arranged, so that not only is the regulation and control on the lining rod 3 convenient, but also the coaxial arrangement can maximally improve the mechanical feedback of the single-lumen tube 2 to the lining rod 3 from the position close to the tip 204 to the position far from the tip 204, and simultaneously can maximally improve the torque transmission capability of the single-lumen tube from the position far from the tip 204 to the position close to the tip 204.

Further, as shown in fig. 1, the angle between the central axis of the first port 401 and the central axis of the second port 402 is 10 ° to 90 °, so that the handle 4 has a Y shape.

In an alternative embodiment of the present utility model, as shown in fig. 1, a liner rod base 304 capable of sealing and blocking the first port 401 is provided at the first port 401, and one end of the liner rod 3, which is far from the tip end 204, is connected to the liner rod base 304. In the clinical operation process, after the balloon catheter is conveyed to the lesion site, the lining rod 3 is pushed forward to the tip end 204 of the single-cavity tube 2, meanwhile, the lining rod base 304 and the first port 401 on the handle 4 are sealed and fixed, after the sealing and fixing, liquid is injected into the cavity 205 through the second port 402, and the connecting position of the lining rod base 304 and the handle 4 can bear the pressure of more than or equal to 3atm without leakage in the water injection process. The inner lining rod 3 is pushed to the position of the single-cavity tube 2 close to the tip end 204, so that the balloon 1 can be ensured to have enough mechanical support in the expansion and expansion process, and displacement of the balloon 1 in the expansion and expansion process can be effectively prevented.

The single-lumen balloon catheter has the characteristics and advantages that:

1. the single-cavity-channel balloon catheter is simple and convenient to operate, can be matched with an endoscope instrument used in clinic and conventionally, can be conveyed to a lesion part of a patient through an instrument channel, reduces damage to human body cavity mucosa in the conveying process of the balloon catheter through a human body cavity, and can improve the conveying and positioning accuracy of the balloon catheter when being conveyed under the direct view of an endoscope.

2. In the single-lumen balloon catheter, the coaxial gradual-change lining rod 3 can adjust the position of the lining rod in the single-lumen catheter 2, so that the control performance, tracking performance and passing performance of the balloon catheter are improved, the relative position of the lining rod in a far section area on the single-lumen catheter 2 can be flexibly adjusted according to the actual environment of a human body lumen in the operation process, the mechanical performance of the far section of the single-lumen catheter 2 is flexibly adjusted, and the success rate of clinical operation is greatly improved.

3. In the single-lumen balloon catheter, the developing wire 303 is arranged on the lining rod 3, so that the accuracy of the back pulling and forward pushing adjustment process of the lining rod 3 in the conveying process of the balloon 1 is ensured, and meanwhile, the optimal flexibility and rebound resilience performance of the distal section of the single-lumen tube 2 are ensured to the greatest extent.

The foregoing is illustrative of the present utility model and is not to be construed as limiting the scope of the utility model. Any equivalent changes and modifications can be made by those skilled in the art without departing from the spirit and principles of this utility model, and are intended to be within the scope of this utility model.

Claims (14)

1. The utility model provides a single-lumen balloon catheter which is characterized in that, shan Qiang way balloon catheter includes single-lumen tube and lining pole, the inside of single-lumen tube is formed with the chamber along its axial, be provided with on the single-lumen tube with the sacculus that the chamber was said and be linked together, the lining pole can be along the axial displacement setting of single-lumen tube in the chamber is said, the one end of single-lumen tube is provided with the first mouth that controls the position of lining pole and is filled with liquid in order to make the inflation of sacculus second mouth in the chamber, the other end of single-lumen tube is formed with sharp tip;

pushing the liner rod inwardly to move it within the lumen to a position proximate the tip portion;

the liner rod is pulled outwardly to move it within the lumen toward the first port to a position away from the tip portion.

2. The single lumen balloon catheter as recited in claim 1 wherein said balloon is disposed on said single lumen tube adjacent said tip portion, an interior of said balloon being in communication with said lumen, and a fluid being injected into said lumen to inflate said balloon.

3. The single lumen balloon catheter of claim 2, wherein the single lumen tube passes through the balloon, and wherein at least one fluid inlet hole is formed in the single lumen tube to communicate the lumen with the interior of the balloon, so that fluid injected into the lumen enters the interior of the balloon.

4. The single lumen balloon catheter of claim 2, wherein the balloon includes an inflation section and first and second ends on either side of the inflation section in an axial direction of the single lumen tube, the balloon being connected to the single lumen tube by the first and second ends, only the inflation section being in an inflated expanded state when a liquid is injected into the balloon.

5. The single lumen balloon catheter as recited in claim 4, wherein said inflation segment surface or a partial region of said inflation segment surface is coated with a drug layer.

6. The single lumen balloon catheter of claim 1, wherein the single lumen tube comprises a first single lumen tube segment, a second single lumen tube segment, and a third single lumen tube segment in that order along its axial direction, the first port and the second port are both located at one end of the first single lumen tube segment, the other end of the first single lumen tube segment is connected to one end of the second single lumen tube segment, the other end of the second single lumen tube segment is connected to one end of the third single lumen tube segment, the tip portion is located at the other end of the third single lumen tube segment, and the hardness of the first single lumen tube segment and the hardness of the second single lumen tube segment are greater than the hardness of the third single lumen tube segment;

the balloon is located on the second single lumen segment and on a side remote from the first single lumen segment.

7. The single lumen balloon catheter of claim 6, wherein the third single lumen tube segment is 3mm to 50mm in axial length along the single lumen tube.

8. The single lumen balloon catheter of claim 7, wherein the third single lumen tube segment is 15mm to 50mm in axial length along the single lumen tube.

9. The single lumen balloon catheter according to claim 1 or 6, wherein said tip portion has a sealed circular arc configuration.

10. The single lumen balloon catheter of claim 1, wherein the liner rod comprises a first liner rod segment distal to the tip portion and a second liner rod segment proximal to the tip portion, the first liner rod segment being a straight rod-like structure extending in an axial direction of the single lumen tube;

the second lining rod section comprises a reducing section and a straight section, one end of the reducing section is connected with the first lining rod section, the other end of the reducing section is connected with the straight section, and the reducing section is of a conical rod-shaped structure with gradually reduced radius from the tip end to the direction close to the tip end.

11. The single lumen balloon catheter of claim 10, wherein the straight section has a visualization wire disposed thereon.

12. The single lumen balloon catheter of claim 11, wherein said visualization wire is helically wound and secured to said straight section.

13. The single lumen balloon catheter of claim 1, wherein the Shan Qiang balloon catheter comprises a handle connected to the single lumen tube at an end distal from the tip portion, the first port and the second port both being located on the handle, the first port, the single lumen tube, and the liner rod all being coaxially disposed.

14. The single lumen balloon catheter as recited in claim 13, wherein said first port is provided with a liner stem mount capable of sealing and sealing said first port, and wherein an end of said liner stem distal from said tip portion is connected to said liner stem mount.

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