CN115040762B

CN115040762B - Balloon catheter

Info

Publication number: CN115040762B
Application number: CN202210834800.8A
Authority: CN
Inventors: 吴难; 潘淑芬
Original assignee: Shenzhen Micro Medical Technology Co ltd
Current assignee: Shenzhen Micro Medical Technology Co ltd
Priority date: 2022-07-16
Filing date: 2022-07-16
Publication date: 2023-06-23
Anticipated expiration: 2042-07-16
Also published as: CN115040762A

Abstract

The application relates to a balloon catheter, which comprises a catheter seat, a balloon, an inner catheter and an outer catheter, wherein the inner catheter and the outer catheter are inserted into the catheter seat, the balloon comprises an inner membrane and an outer membrane, both ends of the inner membrane and the outer membrane are fixedly arranged on the outer wall of the outer catheter, and a gap is reserved between the inner membrane and the outer membrane; the inner conduit and the outer conduit are coaxially arranged in a double-cavity way, a pipe channel is formed between the inner conduit and the outer conduit, the inner part of the inner membrane is communicated with the pipe channel, a return pipe is arranged in the pipe channel, and the inner part of the return pipe is communicated with the gap; the guide tube seat is provided with a color development groove, a color development part for developing color with liquid reaction is arranged in the color development groove, the color development groove is communicated with the return tube, the notch of the color development groove is provided with a sealing plate, and the inside of the color development groove is in a negative pressure state so that liquid in the return tube can enter the color development groove. The balloon catheter has the effects of being capable of monitoring balloon fragmentation and improving safety of the balloon catheter.

Description

Balloon catheter

Technical Field

The application relates to the technical field of medical instruments, in particular to a balloon catheter.

Background

Cardiovascular stenosis refers to arterial and venous blood vessels of a human body, including coronary, peripheral, intracranial and the like, due to abnormal lipid metabolism, lipids in blood deposit on an originally smooth vascular intima and gradually accumulate into atheromatous lipid plaques, and as time goes by, the plaques increase and even calcifie to cause the luminal stenosis of the blood vessel, so that blood flow is blocked, and the downstream blood vessel and the organism are ischemic, so that corresponding clinical manifestation is generated. If the stenosis occurs in the coronary artery, palpitation, chest pain, dyspnea and angina can occur, and serious cases can lead to myocardial ischemia or myocardial necrosis; if it occurs at the periphery, it can cause skin epidermis temperature reduction, muscle atrophy, intermittent break-up and even necrosis or amputation of the distal limb; if it occurs intracranially, dizziness, syncope and even brain tissue damage and brain dysfunction can occur.

For traditional catheter interventional techniques, percutaneous balloon dilation angioplasty (PTA) is commonly used clinically to open calcified lesions in arteriovenous vessels. When the balloon is inflated to expand calcified lesions in the vessel wall, the balloon gradually releases pressure until the calcified plaque ruptures. However, in clinic, the operation errors of operators cause excessive injected liquid, so that the balloon is subjected to excessive pressure to be cracked, no sign is caused before the cracking, the operators cannot take emergency measures for the first time, and great potential safety hazards exist.

The related art described above has a defect that the balloon fragmentation cannot be monitored.

Disclosure of Invention

In order to improve the problem of failure to monitor balloon fragmentation, the present application provides a balloon catheter.

The balloon catheter provided by the application adopts the following technical scheme:

the balloon catheter comprises a catheter seat, a balloon, an inner catheter and an outer catheter, wherein the inner catheter and the outer catheter are inserted into the catheter seat, the balloon comprises an inner membrane and an outer membrane, both ends of the inner membrane and the outer membrane are fixedly arranged on the outer wall of the outer catheter, and a gap is reserved between the inner membrane and the outer membrane; the inner conduit and the outer conduit are coaxially arranged in a double-cavity way, a pipe channel is formed between the inner conduit and the outer conduit, the inner part of the inner membrane is communicated with the pipe channel, a return pipe is arranged in the pipe channel, and the inner part of the return pipe is communicated with the gap; the guide tube seat is provided with a color development groove, a color development part for developing color with liquid reaction is arranged in the color development groove, the color development groove is communicated with the return tube, the notch of the color development groove is provided with a sealing plate, and the inside of the color development groove is in a negative pressure state, so that liquid in the return tube can enter the color development groove.

Through adopting above-mentioned technical scheme, when the inner membrance of sacculus is cracked because internal pressure is too big, the adventitia of sacculus plays the guard action, makes liquid and piece be difficult for getting into in the blood vessel, and the liquid in the inner membrance will flow into in the clearance between inner membrance and the adventitia simultaneously, and flows into in the back flow. Because the inside of developing groove is in negative pressure state, after the internal film of sacculus is cracked, liquid will flow into in the developing groove automatically, and the color development is developed after the color development piece contacts liquid and reminds operating personnel that the sacculus is cracked, realizes the cracked monitoring of sacculus, has improved the security of sacculus pipe.

Optionally, the back flow includes the intercommunication portion and is used for with the converging portion that liquid in the intercommunication portion meets, the intercommunication portion with the coaxial setting of interior pipe, the both ends of intercommunication portion set firmly in the inner wall of outer pipe, and with the inner wall of outer pipe forms the accommodation cavity, the accommodation cavity with the clearance is linked together.

Through adopting above-mentioned technical scheme, after the sacculus intima is cracked, liquid gets into the accommodation chamber from the clearance, and liquid in the accommodation chamber is through converging the portion and meet the back, flows into fast in the color development groove and is contacted with the color development piece, has improved monitoring efficiency.

Optionally, one end of the communicating portion is fixedly arranged at one end of the inner wall of the outer catheter, which corresponds to one end of the inner membrane, which is close to the catheter seat, and the other end of the communicating portion is fixedly arranged at one end of the inner wall of the outer catheter, which corresponds to one end of the outer membrane, which is close to the catheter seat, and the outer catheter is provided with a through hole corresponding to the accommodating cavity, and the accommodating cavity is communicated with the gap through the through hole.

Through adopting above-mentioned technical scheme, liquid gets into in the holding cavity through the through-hole after getting into the clearance, and the sacculus of intercommunication portion setting at outer pipe inner wall is close to the one end of catheter seat, and the width is the interval of inner membrance and adventitia, under the circumstances that does not hinder the liquid in the clearance to get into the holding cavity, has reduced the length of back flow and the capacity that the holding cavity held liquid, just can get into in the color development groove through a small amount of liquid and contact with the color development piece, has improved monitoring efficiency, makes the sacculus pipe can develop color fast and suggestion operating personnel carry out emergency treatment.

Optionally, the portion that converges is bar tubular, and laminating the inner wall setting of outer pipe, the one end of portion that converges communicate in the intercommunication portion, the other end of portion that converges connect in the color development groove.

By adopting the technical scheme, the converging part is in a strip-shaped tubular shape and is attached to the inner wall of the outer catheter, so that the sectional area of the converging part is reduced, the liquid flow is reduced, and the liquid can flow into the color development groove more quickly; liquid in the communicating part is converged through the converging part, so that the monitoring efficiency is further improved, an operator can take emergency measures for the first time, and potential safety hazards are eliminated.

Optionally, a shutoff mechanism triggered by the liquid in the return pipe is arranged on the guide pipe seat; when the liquid in the return pipe flows back to the shutoff mechanism, the shutoff mechanism shuts off the liquid in the guide pipe seat so as to stop the liquid from being injected into the pipe channel.

By adopting the technical scheme, the liquid flows back through the return pipe to trigger the action of the shutoff mechanism by the setting of the shutoff mechanism, and the shutoff mechanism prevents the liquid in the guide pipe seat from being continuously injected. The liquid is intercepted by the intercepting mechanism, even if operators do not notice that the inner membrane of the balloon is broken, the pressure born by the outer membrane of the balloon can also stop increasing, the reaction time is reserved for the operators, the emergency treatment is carried out after the operators find abnormality, and the safety of the balloon catheter is improved.

Optionally, the catheter seat includes a liquid injection pipe, a liquid outlet pipe and a main pipe barrel, wherein one ends of the liquid injection pipe and the liquid outlet pipe are both communicated with the main pipe barrel; the inner conduit and one end of the outer conduit are both inserted into the main conduit barrel, a wire in the inner conduit is led out from the main conduit barrel, and the liquid injection pipe and the liquid outlet pipe are respectively communicated with the outer conduit.

Through adopting above-mentioned technical scheme, external liquid is poured into the pipe passageway from annotating the liquid pipe, and the liquid of pipe passageway can flow out from the drain pipe, annotates the one end of liquid pipe and drain pipe and all communicate with leading pipe barrel, makes things convenient for interior pipe and outer pipe to be connected with the pipe seat, realizes liquid cycle, the operation of being convenient for.

Optionally, the shutoff mechanism is disposed on the main pipe barrel and is close to a communication position between the liquid injection pipe and the outer catheter.

Through adopting above-mentioned technical scheme, liquid is from annotating the liquid pipe in the notes liquid pipe and annotating the pipe passageway, and shutoff mechanism sets up in being close to the intercommunication department of notes liquid pipe and leading pipe barrel, intercepts the liquid in the notes liquid pipe, makes shutoff mechanism be close to the back flow, reduces the length of back flow, and then reduces the required flow of liquid flow to shutoff mechanism for liquid in the back flow can trigger the shutoff mechanism fast and cut off.

Optionally, the shutoff mechanism includes the gasbag, be provided with in the gasbag be used for with the liquid in the back flow after the reaction produce gaseous reactant, annotate the liquid pipe be close to with the inner wall of the intercommunication department of outer pipe has seted up the mounting groove, the gasbag install in the mounting groove, and with the back flow is linked together.

By adopting the technical scheme, the liquid in the return pipe reacts with the reactant in the air bag to generate gas so that the air bag is inflated to block the liquid injection pipe, the liquid in the liquid injection pipe is stopped, and the external liquid is not easy to be injected into the guide pipe.

Optionally, a positioning groove used for being embedded and matched with the air bag after expanding is further formed in the inner wall of the liquid injection pipe, and the positioning groove is arranged opposite to the mounting groove.

Through adopting above-mentioned technical scheme, the setting of constant head tank makes the gasbag expand the back be difficult for receiving the influence of the rivers in the notes liquid pipe, and makes the shutoff effect better.

Optionally, a gas valve membrane for limiting the gas in the air bag to enter the return pipe is arranged at the communication part of the air bag and the return pipe.

Through adopting above-mentioned technical scheme, the setting of pneumatic valve membrane makes the gas in the gasbag be difficult for getting into in the back flow, has improved the stability of shutoff mechanism.

In summary, the present application includes at least one of the following beneficial technical effects:

1. through setting up inner membrance and adventitia with the sacculus, after the inner membrance is cracked, liquid flows into the color development groove through the back flow and contacts the color development piece, and the color development piece develops and prompts operating personnel that the sacculus is cracked, has realized the monitoring to the sacculus is cracked, has improved the security of sacculus pipe. The middle trigger cut-off mechanism acts to stop the liquid from being injected into the pipe channel, and prompts operators that the saccule is broken, so that saccule breakage monitoring is realized; even if operators do not pay attention, the liquid in the balloon catheter can not enter the blood vessel, so that enough reaction time is reserved for the operators, and the safety of the balloon catheter is improved;

2. by arranging the shutoff mechanism, the shutoff mechanism is triggered by liquid in the return pipe to prevent the liquid in the catheter seat from being continuously injected, so that the pressure born by the balloon is stopped to be increased, the reaction time is reserved for operators, emergency treatment is carried out after the operators find abnormality, and the safety of the balloon catheter is improved;

3. the air valve membrane ensures that the air in the air bag is not easy to enter the return pipe, so that the liquid in the return pipe is not easy to be influenced by the air and flows back to the air bag again, and the stability of the shutoff mechanism is improved.

Drawings

FIG. 1 is a schematic diagram of an embodiment of the present application;

FIG. 2 is an enlarged view of portion A of FIG. 1;

FIG. 3 is an enlarged view of portion B of FIG. 1;

FIG. 4 is a cross-sectional view of an embodiment of the present application showing the communication portion coaxially disposed with the inner catheter;

FIG. 5 is a cross-sectional view of an embodiment of the present application showing the bus section in a strip-like tubular shape;

FIG. 6 is an enlarged view of portion C of FIG. 1;

fig. 7 is a state diagram of the intercepting liquid after the inflation of the balloon according to the embodiment of the present application.

Reference numerals illustrate: 1. a catheter holder; 11. a liquid injection pipe; 111. a mounting groove; 112. a positioning groove; 12. a liquid outlet pipe; 13. a main conduit tube;

2. a balloon; 21. an inner membrane; 22. an outer membrane; 23. a gap; 3. an inner catheter; 4. an outer conduit;

5. a tube channel; 6. a return pipe; 61. a communication section; 611. a receiving chamber; 62. a converging portion;

7. a shutoff mechanism; 71. an air bag; 72. an air valve membrane;

8. a color development groove; 81. a color development member; 82. and (5) sealing the plate.

Detailed Description

The present application is described in further detail below in conjunction with figures 1-7.

In the description of the present invention, it should be understood that, for simplicity of drawing, only the portions relevant to the present invention are schematically shown in the drawings, and they do not represent the actual structure thereof as a product. Additionally, in order to simplify the drawing for ease of understanding, components having the same structure or function in some of the drawings are shown schematically with only one of them, or only one of them is labeled.

The embodiment of the application discloses a balloon catheter, which can prevent liquid from continuously injecting when monitoring whether a balloon is cracked, so that the safety of the balloon catheter is improved.

Referring to fig. 1 and 2, the balloon catheter comprises a catheter seat 1, a balloon 2, an inner catheter 3, an outer catheter 4, a return pipe 6 and a color development groove 8, when the balloon 2 is broken, liquid in the balloon 2 enters the color development groove 8 through the return pipe 6, a color development piece 81 is arranged in the color development groove 8, the color of the color development piece 81 changes after contacting the liquid, so that the broken monitoring of the balloon 2 is realized, and an operator judges that the balloon 2 is broken by observing whether the color development piece 81 in the color development groove 8 changes in color.

Referring to fig. 1 and 3, in particular, an inner catheter 3 and an outer catheter 4 are coaxially provided in a double-lumen manner and inserted into a catheter hub 1, and a catheter channel 5 is formed between the inner catheter 3 and the outer catheter 4; the balloon 2 comprises an inner membrane 21 and an outer membrane 22, and a gap 23 is reserved between the inner membrane 21 and the outer membrane 22; the inside of the inner membrane 21 communicates with the tube passage 5; the return pipe 6 is arranged in the pipe channel 5, the interior of the return pipe 6 being in communication with the gap 23. Referring to fig. 2, a color development groove 8 is provided on a catheter holder 1, and a color development member 81 is fixed to the bottom wall of the color development groove 8, and the bottom of the color development groove 8 communicates with a return pipe 6. The notch of the color development groove 8 is provided with a sealing plate 82, the sealing plate 82 is provided with an air extraction valve (not shown in the figure), and the interior of the color development groove 8 is in a negative pressure state by air extraction of the air extraction valve, and the negative pressure state is sufficient for sucking the liquid after the balloon 2 is broken into the color development groove 8. When the inner membrane 21 of the balloon 2 breaks, the outer membrane 22 of the balloon 2 serves as a shield, making it difficult for liquids and debris to enter the blood vessel, while the liquid in the inner membrane 21 will flow into the gap 23 between the inner membrane 21 and the outer membrane 22 and into the return tube 6. Because the color development groove 8 is communicated with the return pipe 6 and is in a negative pressure state, liquid automatically flows into the return pipe 6 and the color development groove 8 after the balloon 2 is broken, and the color development part 81 contacts the liquid to develop color so as to remind operators that the balloon 2 is broken, so that the broken monitoring of the balloon 2 is realized, and the safety of the balloon catheter is improved.

Referring to fig. 3, in the embodiment of the present application, the inner film 21 and the outer film 22 are connected to the outer pipe 4 by hot melt welding or laser welding to secure the reliability of the connection. The outer tube 4 is provided with a liquid injection hole (not shown in the figure), and the inside of the inner membrane 21 is communicated with the tube passage 5 through the liquid injection hole. The outer conduit 4 is also provided with a through hole (not shown in the figures) through which the gap 23 communicates with the return conduit 6. The color development part 81 is a water detection test paper, the initial state of the water detection test paper is white, and the color of the water detection test paper changes after meeting water, so as to prompt an operator that the balloon 2 is broken and needs emergency treatment.

Referring to fig. 1, the catheter holder 1 includes a liquid injection tube 11, a liquid outlet tube 12 and a main pipe barrel 13, wherein one ends of the liquid injection tube 11 and the liquid outlet tube 12 are both communicated with the main pipe barrel 13; one end of the inner conduit 3 and one end of the outer conduit 4 are respectively inserted into the main conduit barrel 13, wires in the inner conduit 3 are led out from the main conduit barrel 13, and the liquid injection pipe 11 and the liquid outlet pipe 12 are respectively communicated with the outer conduit 4. Specifically, the liquid injection pipe 11 and the liquid outlet pipe 12 are respectively and obliquely fixed on two sides of the main pipe barrel 13, and the liquid injection pipe 11 port and the liquid outlet pipe 12 port are both positioned on the same side as the main pipe barrel 13 port, so that liquid injection and liquid outflow are facilitated, and liquid circulation is realized. By controlling the inflation and deflation of the balloon 2 through the injection and outflow of liquid during operation, the outflow of liquid from the outlet tube 12 can be controlled when the balloon 2 is broken, facilitating the removal of the balloon catheter.

Referring to fig. 2 and 3, the return pipe 6 includes a communicating portion 61 and a converging portion 62, the communicating portion 61 is coaxially disposed with the inner pipe 3, both ends of the communicating portion 61 are fixedly disposed on the inner wall of the outer pipe 4, and form a receiving chamber 611 with the inner wall of the outer pipe 4, the receiving chamber 611 being in communication with the gap 23; the liquid flows into the annular accommodating cavity 611 through the gap 23 and then flows into the color development groove 8 through the confluence part 62, so that the liquid quickly flows into the color development groove 8 to be contacted with the color development member 81, and the monitoring efficiency is improved.

Referring to fig. 4, specifically, one end of the communicating portion 61 is fixed to one end of the inner wall of the outer catheter 4 corresponding to the inner membrane 21 near the catheter holder 1, and the other end of the communicating portion 61 is fixed to one end of the inner wall of the outer catheter 4 corresponding to the outer membrane 22 near the catheter holder 1, so that the width of the communicating portion 61 is the distance between the inner membrane 21 and the outer membrane 22, the length of the return tube 6 and the capacity of the accommodating chamber 611 for accommodating the liquid are reduced without obstructing the liquid in the gap 23, the liquid can enter the color development groove 8 to be contacted with the color development member 81 through a small amount of liquid, the monitoring efficiency is improved, and the balloon catheter can be developed quickly to prompt an operator to perform emergency treatment.

Referring to fig. 2 and 5, the confluence portion 62 is provided in a strip-like tubular shape and is attached to the inner wall of the outer tube 4, one end of the confluence portion 62 is connected to the communication portion 61, and the other end of the confluence portion 62 is connected to the color development groove 8.

Referring to fig. 1 and 5, specifically, in the present embodiment, the converging portion 62 is a thin long tube, and one side edge of the converging portion 62 is attached to the inner wall of the outer catheter 4 and is located on the same side as the liquid injection tube 11, so that the cross-sectional area of the converging portion 62 is reduced, and the flow rate of the liquid is reduced, thereby enabling the liquid to flow more rapidly; the liquid in the communicating part 61 is converged through the converging part 62, so that the monitoring efficiency is further improved, and the operator can take emergency measures for the first time, so that potential safety hazards are eliminated. Accordingly, the confluence part 62 is not limited to the strip-shaped tube shape, but may be other tube-shaped structures such as a ring-shaped tube.

Referring to fig. 1 and 6, a shutoff mechanism 7 is provided on the catheter holder 1, the shutoff mechanism 7 is triggered by the liquid in the return pipe 6, and when the liquid in the return pipe 6 flows back to the shutoff mechanism 7, the shutoff mechanism 7 shuts off the liquid in the catheter holder 1 so that the liquid stops being injected into the pipe passage 5. The shutoff mechanism 7 is arranged, the liquid flows back through the return pipe 6 to trigger the shutoff mechanism 7 to act, and the shutoff mechanism 7 prevents the liquid in the catheter seat 1 from being continuously injected. Meanwhile, reaction time is reserved for operators, even if the operators do not notice that the balloon 2 is broken, the pressure born by the outer membrane 22 of the balloon 2 can stop increasing because the shutoff mechanism 7 shuts off the liquid, and emergency treatment is carried out after the operators find abnormality, so that the safety of the balloon catheter is improved.

The shutoff mechanism 7 is arranged on the main guide pipe barrel 13 and is close to the communication position of the liquid injection pipe 11 and the outer guide pipe 4, so that the shutoff mechanism 7 is closer to the return pipe 6, the length of the return pipe 6 is reduced, and then the flow required by liquid flowing to the shutoff mechanism 7 is reduced, and the liquid in the return pipe 6 can trigger the shutoff mechanism 7 to perform shutoff.

The shutoff mechanism 7 includes an air bag 71 and an air valve film 72, and the injection pipe 11 is provided with a mounting groove 111 matching the air bag 71 on an inner wall near a communication portion with the outer pipe 4, and the confluence portion 62 is communicated with the mounting groove 111, and the air bag 71 is mounted in the mounting groove 111 and is communicated with the return pipe 6. The air bag 71 is provided with a reactant (not shown) which can react with the liquid to generate gas, and the reactant can be effervescent granules or other reactants which can react with the liquid to generate stable byproducts and gas; the air bag 71 is communicated with the return pipe 6, and the air bag 71 can block the liquid injection pipe 11 after being inflated, so that the liquid in the liquid injection pipe 11 is stopped, and external liquid is not easy to be injected into the guide pipe. In the present invention, it should be understood that the gas generated by the reactant and the liquid in the balloon 71 is sufficient to expand the balloon 71 and then insert into the positioning groove 112 to prevent the liquid from continuing to flow into the tube passage 5, and the balloon 71 will not be ruptured.

In order to make the interception effect better, a positioning groove 112 is arranged on the inner wall of the liquid injection pipe 11 opposite to the mounting groove 111, when the air bag 71 is inflated, one side of the air bag 71 far away from the mounting groove 111 can be embedded in the positioning groove 112, so that the inflated air bag 71 is not easily influenced by water flow in the liquid injection pipe 11. In this embodiment, a square air bag 71 which is inflated along the length direction of the main tube 13 is adopted, the air bag 71 in the initial state is also square, when the reactant in the air bag 71 reacts with the liquid to generate gas, the air bag 71 is inflated directly towards the direction of the positioning groove 112, and is embedded into the positioning groove 112. The air bag 71 in the initial state does not protrude from the inner wall of the liquid injection tube 11, and prevents the liquid injection tube 11 from being blocked from injecting liquid when the air bag 71 is not operated. The opening of the positioning groove 112 is provided with a guide surface, so that the opening area of the positioning groove 112 is increased, and the air bag 71 is easier to enter the positioning groove 112 in the expansion process.

Referring to fig. 6 and 7, a gas valve film 72 is provided at a communication place of the gas bag 71 and the confluence portion 62, the gas valve film 72 restricting the gas in the gas bag 71 from entering the confluence portion 62. Specifically, the air valve film 72 is attached to the communicating position, the air valve film 72 leaves a unique inlet and outlet through which liquid flows, the liquid in the converging portion 62 enters the air bag 71 through the unique inlet and outlet of the air valve film 72 to contact with the reactant to generate gas, the air pressure inside the air bag 71 gradually rises, when the air pressure is larger than the pressure of the liquid in the converging portion 62, the air pressure extrudes the air valve film 72, the unique inlet and outlet of the air valve film 72 is closed, the liquid cannot enter the air bag 71, the air bag 71 finishes the intercepting action, and the stability of the intercepting mechanism 7 is improved.

The implementation principle of the balloon catheter in the embodiment of the application is as follows: the balloon catheter is provided with a double-layer structure of an inner membrane 21 and an outer membrane 22, and the inside of a color development groove 8 on the catheter seat 1 is in a negative pressure state; when the inner membrane 21 is broken, liquid automatically flows into the gap 23 between the inner membrane 21 and the outer membrane 22, and contacts the color development member 81 when flowing into the color development groove 8 through the return pipe 6, so that the color development member 81 develops to remind an operator of the broken balloon 2, and the broken balloon 2 is monitored. The catheter seat 1 is also provided with a shutoff mechanism 7 for shutoff of liquid, the liquid in the return pipe 6 enters the air bag 71 through the only inlet and outlet of the air valve film 72 and contacts with the reactant to generate gas so as to expand the air bag 71, and the air bag 71 is inflated to shutoff the liquid. Even if operators do not notice abnormality, liquid cannot be continuously injected into the catheter, so that the safety of the balloon catheter is further improved, and potential safety hazards are eliminated.

The foregoing are all preferred embodiments of the present application, and are not intended to limit the scope of the present application in any way, therefore: all equivalent changes in structure, shape and principle of this application should be covered in the protection scope of this application.

Claims

1. A balloon catheter, characterized in that: the catheter comprises a catheter seat (1), a balloon (2) and an inner catheter (3) and an outer catheter (4) which are inserted into the catheter seat (1), wherein the balloon (2) comprises an inner membrane (21) and an outer membrane (22), both ends of the inner membrane (21) and the outer membrane (22) are fixedly arranged on the outer wall of the outer catheter (4), and a gap (23) is reserved between the inner membrane (21) and the outer membrane (22); the inner conduit (3) and the outer conduit (4) are coaxially arranged in a double-cavity mode, a pipe channel (5) is formed between the inner conduit (3) and the outer conduit (4), the inner portion of the inner membrane (21) is communicated with the pipe channel (5), a return pipe (6) is arranged in the pipe channel (5), and the inner portion of the return pipe (6) is communicated with the gap (23); the catheter is characterized in that a color development groove (8) is formed in the catheter seat (1), a color development piece (81) for developing color with liquid reaction is arranged in the color development groove (8), the color development groove (8) is communicated with the return pipe (6), a sealing plate (82) is arranged at a notch of the color development groove (8), and the inside of the color development groove (8) is in a negative pressure state, so that liquid in the return pipe (6) can enter the color development groove (8).

2. The balloon catheter of claim 1, wherein: the return pipe (6) comprises a communication part (61) and a converging part (62) for converging liquid in the communication part (61), the communication part (61) and the inner conduit (3) are coaxially arranged, two ends of the communication part (61) are fixedly arranged on the inner wall of the outer conduit (4) and form a containing cavity (611) with the inner wall of the outer conduit (4), and the containing cavity (611) is communicated with the gap (23).

3. The balloon catheter of claim 2, wherein: one end of the communicating part (61) is fixedly arranged at one end of the inner wall of the outer conduit (4) corresponding to one end of the inner membrane (21) close to the conduit seat (1), the other end of the communicating part (61) is fixedly arranged at one end of the outer conduit (4) corresponding to one end of the outer membrane (22) close to the conduit seat (1), the outer conduit (4) is provided with a through hole corresponding to the accommodating cavity (611), and the accommodating cavity (611) is communicated with the gap (23) through the through hole.

4. A balloon catheter according to claim 3, wherein: the confluence part (62) is in a strip-shaped tubular shape and is attached to the inner wall of the outer catheter (4), one end of the confluence part (62) is communicated with the communication part (61), and the other end of the confluence part (62) is connected with the color development groove (8).

5. The balloon catheter of claim 1, wherein: a shutoff mechanism (7) triggered by liquid in the return pipe (6) is arranged on the guide pipe seat (1); when the liquid in the return pipe (6) flows back to the shutoff mechanism (7), the shutoff mechanism (7) shuts off the liquid in the conduit base (1) so as to stop the liquid from being injected into the pipe channel (5).

6. The balloon catheter of claim 5, wherein: the catheter seat (1) comprises a liquid injection pipe (11), a liquid outlet pipe (12) and a main pipe barrel (13), wherein one ends of the liquid injection pipe (11) and the liquid outlet pipe (12) are communicated with the main pipe barrel (13); one ends of the inner guide pipe (3) and the outer guide pipe (4) are inserted into the main guide pipe barrel (13), a wire in the inner guide pipe (3) is led out of the main guide pipe barrel (13), and the liquid injection pipe (11) and the liquid outlet pipe (12) are respectively communicated with the outer guide pipe (4).

7. The balloon catheter of claim 6, wherein: the shutoff mechanism (7) is arranged on the main guide pipe barrel (13) and is close to the communication position of the liquid injection pipe (11) and the outer guide pipe (4).

8. The balloon catheter of claim 7, wherein: the shutoff mechanism (7) comprises an air bag (71), a reactant which is used for generating gas after reacting with liquid in the return pipe (6) is arranged in the air bag (71), an installation groove (111) is formed in the inner wall of the liquid injection pipe (11) close to the communicating position of the liquid injection pipe and the outer pipe (4), and the air bag (71) is installed in the installation groove (111) and communicated with the return pipe (6).

9. The balloon catheter of claim 8, wherein: the inner wall of the liquid injection pipe (11) is also provided with a positioning groove (112) which is used for being embedded and matched with the air bag (71) after being expanded, and the positioning groove (112) is arranged opposite to the mounting groove (111).

10. The balloon catheter of claim 9, wherein: the communication part of the air bag (71) and the return pipe (6) is provided with an air valve film (72) for limiting the air in the air bag (71) to enter the return pipe (6).