CN213491411U

CN213491411U - Balloon catheter

Info

Publication number: CN213491411U
Application number: CN202021162549.8U
Authority: CN
Inventors: 黄海韬; 马逸; 汪郁卉
Original assignee: Shenzhen Qingyuan Medical Instrument Co ltd
Current assignee: Shenzhen Qingyuan Medical Instrument Co ltd
Priority date: 2020-06-19
Filing date: 2020-06-19
Publication date: 2021-06-22
Anticipated expiration: 2030-06-19

Abstract

The balloon catheter comprises a catheter, a balloon, a luer seat, a locking ring and a limiting piece, wherein the balloon is arranged at the front end of the catheter and communicated with the catheter, the rear end of the catheter is communicated with the outside, and the luer seat is arranged at the rear end of the catheter and used for being externally connected with an inflator; the locking ring is sleeved on the guide pipe and can slide to a preset position along the guide pipe, and the limiting piece is detachably locked at the periphery of the locking ring and extrudes the locking ring so as to be fixed on the guide pipe through the locking ring; the limiting piece is used for abutting against the needle sheath to form axial limiting with the needle sheath. The locking ring is sleeved on the catheter and can slide to a preset position along the catheter, the limiting part is locked at the periphery of the locking ring and is fixed at the preset position of the catheter through the locking ring, and the limiting part can be tightly abutted against the needle sheath and cannot continuously extend into the skin of a human body during working, so that the limitation on the stroke of the catheter is realized, the balloon is prevented from being sent into the position too deep in the skin of the human body, and the difficulty and risk of sending the balloon are effectively reduced.

Description

Balloon catheter

Technical Field

The application belongs to the technical field of medical instruments, and particularly relates to a balloon catheter.

Background

Trigeminal semilunar ganglion balloon compression surgery (PBC) is one of the first treatment methods for treating trigeminal neuralgia in the world at present, and the principle is that trigeminal semilunar ganglion is compressed by a balloon so as to selectively destroy pain warm-sensation nerve fibers. The instrument assembly of trigeminal semilunar ganglion sacculus oppression operation generally includes nook closing member, needle sheath and sacculus pipe, and during the operation, after the needle sheath cooperation nook closing member pierces human skin, the nook closing member withdraws so that the needle sheath remains in the human body, then the sacculus pipe passes through the needle sheath and inserts in the skin to inside observation and the radiography of the oval hole in the skin. The key of the operation is whether the saccule of the saccule catheter can reach the Mylar sac through the oval hole in the skin of a human body.

According to the particularity of the structures of the oval hole and the Mycoplasma capsulatum, the balloon still has a very large risk when being sent into the Mycoplasma capsulatum, and in the process of sending the balloon into the Mycoplasma capsulatum, the length of the balloon catheter entering the skin is too long, so that the patient is injured, and the operation risk is large. At present, the balloon catheter is generally provided with scales for recording the depth of the balloon entering the skin of a human body, but when misjudgment occurs in the operation process, the problem that the length of the balloon catheter entering the skin is too large is still faced, and the injury to a patient is caused.

SUMMERY OF THE UTILITY MODEL

One of the purposes of the embodiment of the application is as follows: the utility model provides a sacculus pipe, aims at solving among the prior art, and the length that the sacculus pipe stretched into human skin is too big leads to the technical problem that the operation risk is big.

In order to solve the technical problem, the embodiment of the application adopts the following technical scheme:

the balloon catheter comprises a catheter, a balloon, a luer seat, a locking ring and a limiting piece, wherein the balloon is arranged at the front end of the catheter and communicated with the catheter, the rear end of the catheter is communicated with the outside, and the luer seat is arranged at the rear end of the catheter and used for being externally connected with an inflator; the locking ring is sleeved on the guide pipe and can slide to a preset position along the guide pipe, and the limiting piece is detachably locked at the periphery of the locking ring and extrudes the locking ring so as to be fixed on the guide pipe through the locking ring; the limiting piece is used for abutting against the needle sheath to form axial limiting with the needle sheath.

In one embodiment, the locking ring is a rubber ring or a silicone ring.

In one embodiment, the limiting member includes a first limiting sleeve and a second limiting sleeve respectively sleeved on the conduit, the inner peripheral wall of the first limiting sleeve is formed with a first step, and one end of the locking ring abuts against the first step; the second limiting sleeve is at least partially locked in the first limiting sleeve and extrudes the other end of the locking ring along the axial direction, so that the locking ring is deformed and fixed between the guide pipe and the inner peripheral wall of the first limiting sleeve.

In one embodiment, the inner peripheral wall of the first stop collar is further formed with a second step axially spaced from the first step, and the outer peripheral wall of the second stop collar is formed with a third step; the third step is abutted against the second step to form the axial limiting of the first limiting sleeve and the second limiting sleeve.

In one embodiment, the outer peripheral wall of the second stop collar is formed with a fourth step, and the fourth step abuts against the end surface of the first stop collar to form axial stop of the first stop collar and the second stop collar.

In one embodiment, the limiting member includes a first limiting member and a second limiting member connected to the first limiting member, and the locking ring abuts against between the first limiting member and the second limiting member; the first limiting block is provided with a first groove, the second limiting block is provided with a second groove, and two opposite sides of the locking ring are respectively accommodated in the first groove and the second groove.

In one embodiment, the locking ring includes a first locking portion and a second locking portion, the first locking portion is fixed in the first groove, the second locking portion is fixed in the second groove, and the conduit is abutted between the first locking portion and the second locking portion.

In one embodiment, one end of the first limiting block is hinged to one end of the second limiting block through a hinge, and the other end of the first limiting block is detachably connected with the other end of the second limiting block.

In one embodiment, the first limiting block is provided with a first avoiding groove, the second limiting block is provided with a second avoiding groove, and two ends of the hinge are respectively fixed in the first avoiding groove and the second avoiding groove.

In one embodiment, a fastener is arranged on the first limiting block, a fastening position is arranged on the second limiting block, and the fastener is clamped in the fastening position.

The application provides a balloon catheter's beneficial effect lies in: compared with the prior art, the balloon and the luer seat are respectively arranged at the two ends of the catheter, and the externally injected developer enters the balloon through the catheter so as to perform developing operation. The locking ring is sleeved on the catheter and can slide to a preset position along the catheter, the limiting part is locked at the periphery of the locking ring and is fixed at the preset position of the catheter through the locking ring, the catheter stretches into the skin of a human body through the needle sheath during working, the limiting part and the catheter move simultaneously and can be abutted against the needle sheath and cannot continue to stretch into the skin of the human body, the limitation on the stroke of the catheter is realized, the phenomenon that the balloon is sent into the position too deep in the skin of the human body is avoided, and the difficulty and the risk of sending the balloon into are effectively reduced.

Drawings

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

Fig. 1 is a front view of a balloon catheter provided in accordance with an embodiment of the present application;

fig. 2 is a cross-sectional view of a balloon catheter provided in accordance with an embodiment of the present application;

FIG. 3 is an enlarged view of a portion of FIG. 2 at A;

fig. 4 is an exploded cross-sectional view of a stop member of a balloon catheter according to an embodiment of the present disclosure;

fig. 5 is a front view of a balloon catheter provided in example two of the present application;

fig. 6 is a perspective structural view of the balloon catheter according to the second embodiment of the present application when the limiting member is locked;

fig. 7 is a perspective view of a position-limiting member of a balloon catheter according to a second embodiment of the present disclosure when deployed;

fig. 8 is an exploded view of a stopper of a balloon catheter according to the second embodiment of the present application.

Wherein, in the figures, the respective reference numerals:

1-a catheter; 2-a balloon; a 3-luer seat; 4-a locking ring; 41-a first locking portion; 42-a second locking portion; 5-a limiting part; 51-a first stop collar; 511-a first step; 512-second step; 513-internal threads; 52-a second stop collar; 521-a third step; 522-fourth step; 523-external thread; 53-a first stopper; 531-first groove; 532-first avoiding groove; 533-fastener; 54-a second stopper; 541-a second groove; 542-a second avoiding groove; 543-fastening position; 55-hinge; 6-buckling; and 7-capping.

Detailed Description

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

In the description of the present application, it is to be understood that the terms "length," "width," "depth," "front," "back," "inner," "outer," and the like, as used herein, refer to an orientation or positional relationship illustrated in the drawings for convenience in describing the present application and to simplify the description, and do not indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be considered limiting of the present application.

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

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

In order to explain the technical solutions of the present application, the following detailed descriptions are made with reference to specific drawings and examples.

The first embodiment is as follows:

referring to fig. 1 to 3 together, a balloon catheter provided in an embodiment of the present application will now be described. The balloon catheter that this application embodiment provided includes pipe 1, sacculus 2, luer seat 3, lock ring 4 and locating part 5, and the periphery wall of pipe 1 front end is located and the cover to sacculus 2 front end of pipe 1, and sacculus 2 and pipe 1's front end intercommunication, and the rear end intercommunication of pipe 1 is outside. Luer seat 3 locates the rear end of catheter 1, and luer seat 3 is used for external full ware, and when full ware was connected on luer seat 3, the rear end and the full ware intercommunication of catheter 1. Wherein the filling device is used for injecting a developer or injecting a gas into the catheter 1. When the medical device works, the balloon catheter penetrates through the needle sheath and extends into the skin of a human body, the balloon 2 extends into the Mycobasal sac of the skin of the human body under the driving of the catheter 1, the filling device injects developer or gas into the rear end of the catheter 1, the developer or gas enters the front end of the catheter 1 through the rear end of the catheter 1 and enters the balloon 2 through the front end of the catheter 1, so that the balloon 2 is expanded and expanded, and the balloon 2 performs developing work on the Mycobasal sac. After the work is finished, the developer or gas in the saccule 2 is emptied to the outside through the catheter 1.

Referring to fig. 2, the locking ring 4 is sleeved on the catheter 1, and the locking ring 4 can slide along the outer peripheral wall of the catheter 1, and the locking ring 4 slides along the catheter 1 to a predetermined position of the catheter 1 according to the depth requirement of the catheter 1 extending into the skin of the human body. Locking ring 4 periphery is located to locating part 5 cover, and detachably locks in locking ring 4 periphery, and the internal perisporium of locating part 5 supports tightly and extrudes the periphery wall of locking ring 4, thereby make locking ring 4 by extrusion deformation and support tightly between the periphery wall of pipe 1 and the internal perisporium of locating part 5, the frictional force of locking ring 4 and pipe 1 has been increased, thereby make locking ring 4 be fixed in on pipe 1, locating part 5 is also fixed in on pipe 1 through locking ring 4 simultaneously this moment, therefore, locking ring 4 and locating part 5 are fixed on the preset position of pipe 1 simultaneously. When the device works, the catheter 1 penetrates through the needle sheath and extends into the skin of a human body, when the catheter 1 extends into the skin of the human body to the preset depth, the limiting piece 5 abuts against the rear end of the needle sheath to form axial limiting of the catheter 1 and the needle sheath, so that the stroke of the catheter 1 extending into the skin of the human body is limited, and the phenomenon that the balloon 2 presses the skin of the human body due to the fact that the catheter 1 continues to extend into the skin of the human body is avoided.

Wherein, the sacculus 2 adopts medical high elastic body, is convenient for the sacculus 2 to carry out the compression operation.

In the embodiment of the application, the balloon 2 and the luer base 3 are respectively arranged at two ends of the catheter 1, and the externally injected developer enters the balloon 2 through the catheter 1 to perform the developing operation. The locking ring 4 cover is located on catheter 1 and can slide to predetermined position along catheter 1, locating part 5 locks in the 4 periphery of locking ring and is fixed in the predetermined position of catheter 1 through locking ring 4 on, in operation, catheter 1 stretches into human skin through the needle sheath, locating part 5 and catheter 1 simultaneous movement can support tightly in the needle sheath and can't continue to stretch into human skin, realize the restriction to the stroke of catheter 1, avoid sacculus 2 to send into the too dark position in the human skin, reduce sacculus 2 effectively and send into ground degree of difficulty and risk. When the degree of depth that pipe 1 got into human skin needs to be changed, locating part 5 loosens the back from the periphery wall of lock ring 4, lock ring 4 elasticity resumes, then lock ring 4 can continue to slide to next preset position along pipe 1's periphery wall, in this embodiment, locating part 5 is fixed in pipe 1's periphery wall through lock ring 4, the dismouting operation is very simple convenient, and efficient, in addition, lock ring 4 has the high elasticity, oppress pipe 1 and lead to pipe 1 to be destroyed when avoiding locating part 5 to lock.

Specifically, referring to fig. 2, the luer base 3 is covered with a cap 7 for blocking the rear end of the catheter 1, so that the catheter 1 is isolated from the outside when the luer base 3 is not externally connected with an inflator, and the balloon 2 is prevented from being inflated due to external gas entering the catheter 1, thereby affecting the accuracy of the balloon 2 entering the mylar.

Specifically, referring to fig. 3, the balloon 2 is sleeved at the front end of the catheter 1, and the front end and the rear end of the balloon 2 are fixed on the catheter 1 through the fasteners 6, respectively, so as to realize the sealing connection between the balloon 2 and the catheter 1.

In an embodiment, the locking ring 4 is made of a material with a large friction coefficient and high elasticity, on one hand, when the locking ring 4 is locked by the limiting member 5 due to the high elasticity of the locking ring 4, the locking ring 4 can be smoothly deformed to abut against between the limiting member 5 and the catheter 1, so that the limiting member 5 is fixed on the catheter 1 through the locking ring 4, and the catheter 1 is prevented from being damaged due to the fact that the catheter 1 is pressed when the locking ring 4 is deformed to abut against the outer peripheral wall of the catheter 1. When the retaining part 5 loosens the lock ring 4, the high elasticity can make the lock ring 4 restore to elasticity fast, thereby making the lock ring 4 slide along the pipe 1, prolonging the service life of the lock ring 4. On the other hand, the friction coefficient of the locking ring 4 is large, so that when the locking ring 4 deforms and abuts against the outer peripheral wall of the catheter 1 and the limiting member 5, the friction force between the locking ring 4 and the catheter 1 and between the locking ring 4 and the limiting member 5 can be increased, and the strength of the limiting member 5 fixed on the catheter 1 through the locking ring 4 is enhanced. In this embodiment, the locking ring 4 is selected as a rubber ring or a silica gel ring, and of course, the locking ring 4 made of other types of materials can be selected.

In an embodiment, referring to fig. 2 and fig. 4, the position-limiting member 5 includes a first position-limiting sleeve 51 and a second position-limiting sleeve 52, the first position-limiting sleeve 51 and the second position-limiting sleeve 52 respectively pass through the catheter 1 and are sleeved on the catheter 1, and inner diameters of the first position-limiting sleeve 51 and the second position-limiting sleeve 52 are slightly larger than an outer diameter of the catheter 1, so that the first position-limiting sleeve 51 and the second position-limiting sleeve 52 can slide to a predetermined position along the catheter 1. The inner peripheral wall of the first limiting sleeve 51 is provided with a circle of first steps 511, the locking ring 4 is accommodated in the first limiting sleeve 51, and one end of the locking ring 4 abuts against the first steps 511, so that the locking ring 4 is limited along the direction in which the catheter 1 extends into the skin of the human body. The second position-limiting sleeve 52 at least partially extends into the first position-limiting sleeve 51, the second position-limiting sleeve 52 is locked in the first position-limiting sleeve 51, when the second position-limiting sleeve 52 extends into the first position-limiting sleeve 51, the other end of the locking ring 4 is axially pressed, that is, the position-limiting of the locking ring 4 in the direction opposite to the direction in which the catheter 1 extends into the skin of the human body is formed, so that the locking ring 4 abuts against between the first step 511 and the second position-limiting sleeve 52 to generate deformation, after the locking ring 4 deforms, the inner peripheral wall of the locking ring 4 abuts against the outer peripheral wall of the catheter 1, the outer peripheral wall of the locking ring 4 abuts against the outer peripheral wall of the first position-limiting sleeve 51, so that the locking ring 4 is fixed between the outer peripheral wall of the catheter 1 and the inner peripheral wall of the first position-limiting sleeve 51, at this time, the first position-limiting sleeve 51 is fixed on the outer peripheral wall of the locking ring 4, and the second position-limiting sleeve 52 is locked on the first position-limiting sleeve 51, for forming a stop with the needle sheath.

Specifically, referring to fig. 4, an internal thread 513 is formed on an inner peripheral wall of the first position-limiting sleeve 51, an external thread 523 forming a thread fit with the internal thread 513 is formed on an outer peripheral wall of the second position-limiting sleeve 52, the second position-limiting sleeve 52 is locked on the second position-limiting sleeve 52 in a thread fit manner, and the first position-limiting sleeve 51 and the second position-limiting sleeve 52 are conveniently disassembled and assembled due to the design of the thread fit manner.

In one embodiment, referring to fig. 4, a circle of second steps 512 is further formed on the inner circumferential wall of the first stop collar 51, the second steps 512 and the first steps 511 are axially spaced apart, and the second steps 512 are disposed between the internal threads 513 and the first steps 511. The outer peripheral wall of the second stop collar 52 is formed with a third step 521, when the second stop collar 52 at least partially extends into the first stop collar 51 and is in locking connection with the first stop collar 51, the third step 521 abuts against the second step 512 to form axial limiting of the first stop collar 51 and the second stop collar 52, so that the stroke of the second stop collar 52 extending into the first stop collar 51 is limited, the second stop collar 52 is prevented from infinitely extending into the first stop collar 51 and crushing the locking ring 4, and meanwhile, the second stop collar 52 is prevented from infinitely extending into the first stop collar 51 and pushing the first stop collar 51 to slide.

In one embodiment, referring to fig. 4, the outer peripheral wall of the second stop collar 52 is formed with a fourth step 522, the fourth step 522 is axially spaced apart from the third step 521, and the internal thread 513 is disposed between the third step 521 and the fourth step 522. When the second stop collar 52 at least partially extends into the first stop collar 51 and is in locking connection with the first stop collar 51, the third step 521 abuts against the second step 512, and the fourth step 522 abuts against the end surface of the first stop collar 51, so that the first stop collar 51 and the second stop collar 52 are axially limited, the stroke of the second stop collar 52 extending into the first stop collar 51 is also limited, the double protection of the locking ring 4 is realized, and the second stop collar 52 can also be prevented from pushing the first stop collar 51 to slide along the guide tube 1.

Example two:

referring to fig. 5 to fig. 7, the difference between the present embodiment and the first embodiment is: in one embodiment, the limiting member 5 includes a first limiting block 53 and a second limiting block 54, the second limiting block 54 is connected to the first limiting block 53 and surrounds the periphery of the locking ring 4 together with the first limiting block 53, so that the locking ring 4 is abutted between the first limiting block 53 and the second limiting block 54, at this time, the two opposite sides of the locking ring 4 are extruded by the first limiting block 53 and the second limiting block 54 respectively to cause the deformation of the locking ring 4, and the limiting member 5 is fixed at the preset position of the catheter 1 through the locking ring 4.

Specifically, a first groove 531 is formed in one side of the first limiting block 53, a second groove 541 is formed in one side of the second limiting block 54, the first groove 531 and the second groove 541 are arranged correspondingly, and when the first limiting block 53 and the second limiting block 54 abut against the periphery of the locking ring 4, two opposite sides of the locking ring 4 are accommodated in the first groove 531 and the second groove 541 respectively. In this embodiment, the inner peripheral wall of the first groove 531 and the inner peripheral wall of the second groove 541 are respectively matched with the outer peripheral wall of the locking ring 4, so that the first groove 531 and the second groove 541 can be completely surrounded to contact the locking ring 4, and the first limiting block 53 and the second limiting block 54 can conveniently extrude the locking ring 4.

In an embodiment, please refer to fig. 7, the locking ring 4 includes a first locking portion 41 and a second locking portion 42, the first locking portion 41 is fixed in the first groove 531, the second locking portion 42 is fixed in the second groove 541, when the catheter 1 needs to be limited, the first limiting block 53 and the second limiting block 54 are respectively disposed around the periphery of the catheter 1, and the first limiting block 53 is connected to the second limiting block 54, at this time, the first locking portion 41 on the first limiting block 53 abuts against the outer wall of the catheter 1, and the second locking portion 42 on the second limiting block 54 abuts against the outer wall of the catheter 1, so that the catheter 1 abuts against between the first locking portion 41 and the second locking portion 42 to be deformed, that is, the first locking portion 41 and the second locking portion 42 are simultaneously disposed around the catheter 1.

In an embodiment, please refer to fig. 7 and 8, one end of the first limiting block 53 and one end of the second limiting block 54 are hinged by a hinge 55, so that the first limiting block 53 and the second limiting block 54 can rotate relatively through the hinge 55, and the other end of the first limiting block 53 and the other end of the second limiting block 54 form a detachable connection. When the catheter 1 needs to be limited, the first limiting block 53 and the second limiting block 54 rotate through the hinge 55 and are arranged around the periphery of the catheter 1, and the other end of the first limiting block 53 is connected to the other end of the second limiting block 54, so that the first locking portion 41 on the first limiting block 53 and the second locking portion 42 on the second limiting block 54 can respectively extrude the catheter 1 and be fixed on the catheter 1.

In one embodiment, referring to fig. 8, one end of the first stopper 53 is provided with a first avoiding groove 532, the second stopper 54 is provided with a second avoiding groove 542, and two ends of the hinge 55 respectively extend into the first avoiding groove 532 and the second avoiding groove 542 and are fixed in the first avoiding groove 532 and the second avoiding groove 542 through screws.

In an embodiment, please refer to fig. 8, the first limiting block 53 is hinged to the second limiting block 54 through a hinge 55, a fastener 533 is disposed at the other end of the first limiting block 53, a fastening portion 543 is disposed at the other end of the second limiting block 54, and the fastener 533 is fastened to the fastening portion 543 to form a detachable connection between the other end of the first limiting block 53 and the other end of the second limiting block 54. Therefore, when the catheter 1 needs to be limited, only the first limiting block 53 and the second limiting block 54 need to be placed at the preset position of the catheter 1, and the fastener 533 is clamped on the buckling position 543, so that the first locking portion 41 and the second locking portion 42 respectively extrude the catheter 1, and the limiting member 5 is fixed on the catheter 1, only the fastener 533 needs to be loosened during disassembly, the disassembly and assembly operation is very simple and convenient, the overall flow is simplified, and the operation time is saved.

The rest of this embodiment is the same as the first embodiment, and the unexplained features in this embodiment are explained by the first embodiment, which is not described herein again.

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

Claims

1. The balloon catheter is characterized by comprising a catheter, a balloon, a luer seat, a locking ring and a limiting piece, wherein the balloon is arranged at the front end of the catheter and communicated with the catheter, the rear end of the catheter is communicated with the outside, and the luer seat is arranged at the rear end of the catheter and used for being externally connected with an inflator; the locking ring is sleeved on the guide pipe and can slide to a preset position along the guide pipe, and the limiting piece is detachably locked at the periphery of the locking ring and extrudes the locking ring so as to be fixed on the guide pipe through the locking ring; the limiting piece is used for abutting against the needle sheath to form axial limiting with the needle sheath.

2. The balloon catheter of claim 1, wherein the locking ring is a rubber ring or a silicone ring.

3. The balloon catheter according to claim 1, wherein the retaining member comprises a first retaining sleeve and a second retaining sleeve respectively sleeved on the catheter, the inner peripheral wall of the first retaining sleeve is formed with a first step, and one end of the locking ring abuts against the first step; the second limiting sleeve is at least partially locked in the first limiting sleeve and extrudes the other end of the locking ring along the axial direction, so that the locking ring is deformed and fixed between the guide pipe and the inner peripheral wall of the first limiting sleeve.

4. The balloon catheter according to claim 3, wherein the inner peripheral wall of the first stop collar is further formed with a second step axially spaced from the first step, and the outer peripheral wall of the second stop collar is formed with a third step; the third step is abutted against the second step to form the axial limiting of the first limiting sleeve and the second limiting sleeve.

5. The balloon catheter according to claim 3, wherein the outer peripheral wall of the second stop collar is formed with a fourth step which abuts against the end face of the first stop collar to form axial stop of the first stop collar and the second stop collar.

6. The balloon catheter according to claim 1, wherein the limiting member comprises a first limiting member and a second limiting member connected to the first limiting member, and the locking ring abuts against between the first limiting member and the second limiting member; the first limiting block is provided with a first groove, the second limiting block is provided with a second groove, and two opposite sides of the locking ring are respectively accommodated in the first groove and the second groove.

7. The balloon catheter according to claim 6, wherein the locking ring comprises a first locking portion and a second locking portion, the first locking portion is fixed in the first groove, the second locking portion is fixed in the second groove, and the catheter abuts against between the first locking portion and the second locking portion.

8. The balloon catheter according to claim 6, wherein one end of the first limiting block and one end of the second limiting block are hinged through a hinge, and the other end of the first limiting block is detachably connected with the other end of the second limiting block.

9. The balloon catheter according to claim 8, wherein the first limiting block is provided with a first avoiding groove, the second limiting block is provided with a second avoiding groove, and two ends of the hinge are respectively fixed in the first avoiding groove and the second avoiding groove.

10. The balloon catheter according to claim 6, wherein the first limiting block is provided with a fastener, the second limiting block is provided with a buckling position, and the fastener is clamped at the buckling position.