CN114984413A

CN114984413A - Balloon catheter

Info

Publication number: CN114984413A
Application number: CN202210430184.XA
Authority: CN
Inventors: 王昊飞; 王海军; 史庆; 吴越
Original assignee: Baiwei Wuhan Medical Technology Co ltd
Current assignee: Baiwei Wuhan Medical Technology Co ltd
Priority date: 2022-04-22
Filing date: 2022-04-22
Publication date: 2022-09-02

Abstract

The application discloses a balloon catheter. The balloon catheter comprises: catheters, balloons and one-way valves; in the direction from the near end to the far end of the catheter, the catheter comprises a first catheter and a second catheter, the first catheter comprises a first inner tube and a first outer tube, the first outer tube is sleeved outside the first inner tube, the second catheter comprises a second inner tube and a second outer tube, the second outer tube is sleeved outside the second inner tube, the first inner tube is communicated with the second inner tube, and the first outer tube is communicated with the second outer tube; the connector is coupled to the proximal end of the first catheter, the first catheter and the second catheter are detachably coupled, the proximal end of the balloon is coupled to the second outer tube, the distal end of the balloon is coupled to the outer sidewall of the second inner tube, and the one-way valve is coupled to the second outer tube, the one-way valve being disposed proximate the proximal end of the balloon, the one-way valve being configured to allow a medium within the second outer tube to pass into the distal end of the balloon.

Description

Balloon catheter

Technical Field

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

Background

The eustachian tube is the only pathway for the middle ear to communicate with the outside world, and a blockage or blockage of the eustachian tube can lead to various pathologies of the middle ear system and ultimately to hearing impairment and noise in the head, and if the blockage is too long, a condition known as secretory otitis media can develop. Eustachian tube dysfunction is mainly caused by factors such as mechanical stenosis caused by swelling of the mucosa of the eustachian tube, lack of surfactant in the eustachian tube, inflammation of the mucosa of the eustachian tube or allergic edema.

Eustachian tube expansion is realized by placing a balloon catheter into a eustachian tube, injecting water into the balloon for pressurization, keeping the balloon for a period of time after the balloon reaches a certain pressure, then releasing the pressure in the balloon, and taking out the balloon catheter, so that the pressure of a femoral room can be kept balanced with the outside world to restore the environment in the middle ear. However, in the existing eustachian tube dilatation, when the balloon stays in the eustachian tube, a surgeon needs to stably hold the nasal introducer used for introducing the balloon, so that the balloon stays in the eustachian tube of a patient for a short time, and the treatment effect is poor.

Disclosure of Invention

It is an object of the present application to provide a new technical solution for balloon catheters.

According to a first aspect of embodiments of the present application, there is provided a balloon catheter. The balloon catheter includes: the balloon catheter includes: a catheter, a balloon, a one-way valve and a connector;

in the direction from the near end to the far end of the catheter, the catheter comprises a first catheter and a second catheter, the first catheter comprises a first inner tube and a first outer tube, the first outer tube is sleeved outside the first inner tube, the second catheter comprises a second inner tube and a second outer tube, the second outer tube is sleeved outside the second inner tube, the first inner tube is communicated with the second inner tube, and the first outer tube is communicated with the second outer tube;

the connector is connected to the proximal end of the first catheter;

the first catheter and the second catheter are detachably connected, the proximal end of the balloon is connected with the second outer tube, the distal end of the balloon is connected with the outer side wall of the second inner tube, the one-way valve is connected with the second outer tube, the one-way valve is arranged near the proximal end of the balloon, and the one-way valve is configured to allow the medium in the second outer tube to pass into the distal end of the balloon.

Optionally, a first connecting portion is provided on an inner surface of the first outer tube, a second connecting portion is provided on an outer surface of the second outer tube, the first connecting portion and the second connecting portion are detachably connected, and the first inner tube and the second inner tube are detachably connected.

Optionally, the first catheter further comprises a separation member, a proximal end of the separation member is fixedly connected with the first outer tube, a third connecting portion is arranged on an inner surface of the separation member, a fourth connecting portion is arranged on an outer surface of the second outer tube, the third connecting portion and the fourth connecting portion are detachably connected, and the first inner tube and the second inner tube are detachably connected.

Optionally, the detachable means comprises one of a threaded connection, a sliding connection.

Optionally, the first inner tube has a tip section with an inner diameter that gradually decreases in size in a proximal to distal direction of the first inner tube; the second inner tube has a head section, the inner diameter of the head section is gradually reduced in size from the proximal end to the distal end of the second inner tube, and the end section is inserted into the head section.

Optionally, a through hole is formed in the outer side wall of the second outer pipe, and the distal end of the second outer pipe is connected with the outer side wall of the second inner pipe in a sealing manner;

the proximal end of the balloon is connected to the outer sidewall of the second outer tube, and the through-hole communicates with the balloon interior.

Optionally, the second outer tube comprises a first sub-outer tube and a second sub-outer tube;

the near end of the first sub outer pipe is detachably connected with the first outer pipe, and the far end of the first sub outer pipe is connected with the inlet end of the one-way valve;

the near end of the second sub-outer tube is connected with the outlet end of the one-way valve, and the far end of the second sub-outer tube is connected with the balloon.

Optionally, the check valve comprises a check valve body and an elastic valve plate, the check valve body is connected with the second outer pipe, and the elastic valve plate is arranged in the check valve body and sleeved on the second inner pipe;

the elastic valve plate has a first state and a second state, the elastic valve plate is in the first state, and the one-way valve allows a medium to enter the far end of the balloon; the elastic valve plate is in a second state, and the one-way valve prevents the medium from passing into the near end of the second catheter from the far end of the balloon.

Optionally, the elastic valve plate is in the first state, the elastic valve plate is in an arc-shaped structure, the arc-shaped structure is sunken towards the proximal direction of the second conduit, and a gap is formed between the elastic valve plate and the one-way valve body;

the elastic valve plate is in the second state, and the elastic valve plate is abutted to the inner surface of the one-way valve body.

Optionally, the second inner tube is made of a degradable material, or both the second inner tube and the second outer tube are made of a degradable material.

The utility model has the advantages of a technological effect lies in, this application sacculus pipe includes first pipe and the second pipe of separable connection, and when using, after the eustachian tube was put into to the sacculus pipe, operation sacculus pipe, first pipe and second pipe separation, first pipe is taken out from the eustachian tube, and the second pipe that is provided with the sacculus can stop for a long time in the eustachian tube, promotes the expansion effect of eustachian tube.

Further features of the present application and advantages thereof will become apparent from the following detailed description of exemplary embodiments thereof, which is to be read in connection with the accompanying drawings.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the application and together with the description, serve to explain the principles of the application.

Fig. 1 is a schematic structural view of a balloon catheter according to the present application.

Fig. 2 is an enlarged view showing the connection of the separating member to the guide duct at a in fig. 1.

Fig. 3 is an enlarged view of the check valve at B in fig. 1 in the first state.

Fig. 4 is an enlarged view of the check valve at B in fig. 1 in a second state.

Figure 5 is a schematic view of the catheter with a connector according to the present application.

Fig. 6 is an enlarged view showing the connection of the connector to the first guide pipe at C in fig. 5.

Description of reference numerals:

1. a first conduit; 11. a first inner tube; 12. a first outer tube;

2. a second conduit; 21. a second inner tube; 22. a second outer tube; 221. a first sub-outer tube; 222. a second sub-outer tube; 223. a fourth connecting portion;

3. a balloon;

4. a separating member; 41. a third connecting portion;

5. a one-way valve; 51. a check valve body; 52. an elastic valve plate;

6. a connector is provided.

Detailed Description

Various exemplary embodiments of the present application will now be described in detail with reference to the accompanying drawings. It should be noted that: the relative arrangement of the components and steps, the numerical expressions, and numerical values set forth in these embodiments do not limit the scope of the present application unless specifically stated otherwise.

The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the application, its application, or uses.

Techniques and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail, but are intended to be considered a part of the specification where appropriate.

In all examples shown and discussed herein, any particular value should be construed as merely illustrative, and not limiting. Thus, other examples of the exemplary embodiments may have different values.

It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, further discussion thereof is not required in subsequent figures. In addition, it should be noted that: in the field of interventional medicine, it is common to define the end of the instrument that is proximal to the operator as the proximal end and the end that is distal to the operator as the distal end.

The present application provides a balloon catheter. Referring to fig. 1 to 4, the balloon catheter includes: a catheter, a balloon 3 and a one-way valve 5. In the proximal end to distal end direction of the catheter, the catheter comprises a first catheter 1 and a second catheter 2, the first catheter 1 and the second catheter 2 are detachably connected, the first catheter 1 comprises a first inner tube 11 and a first outer tube 12, the first outer tube 12 is sleeved outside the first inner tube 11, the second catheter 2 comprises a second inner tube 21 and a second outer tube 22, the second outer tube 22 is sleeved outside the second inner tube 21, the first inner tube 11 is communicated with the second inner tube 21, and the first outer tube 12 is communicated with the second outer tube 22;

in this embodiment, the first catheter 1 and the second catheter 2 are detachably connected, the proximal end of the balloon 3 is connected to the second outer tube 22, the distal end of the balloon 3 is connected to the outer sidewall of the second inner tube 21, the one-way valve 5 is connected to the second outer tube 22, the one-way valve 5 is disposed near the proximal end of the balloon 3, and the one-way valve 5 is configured to allow the medium in the second outer tube 22 to pass to the distal end of the balloon 3.

In this embodiment, the balloon catheter comprises a first catheter 1 and a second catheter 2 which are detachably connected, the first catheter 1 being arranged closer to the proximal end of the catheters than the second catheter 2; the second catheter 2 is arranged closer to the distal end of the catheter than the first catheter 1, the second catheter 2 being arranged with the balloon 3 on the second catheter 2. When using, after the eustachian tube was put into to the sacculus pipe, operation sacculus pipe, the separation of first pipe 1 and second pipe 2, first pipe 1 was taken out from the eustachian tube, and second pipe 2 that is provided with sacculus 3 can stop for a long time in the eustachian tube, promotes the expansion effect of eustachian tube.

Specifically, the first catheter 1 comprises a first inner tube 11 and a first outer tube 12, the second catheter 2 comprises a second inner tube 21 and a second outer tube 22, the first inner tube 11 and the second inner tube 21 are in communication, the first outer tube 12 and the second outer tube 22 are in communication, and in an alternative embodiment, the first inner tube 11 and the first outer tube 12 are coaxially arranged, and the second inner tube 21 and the second outer tube 22 are coaxially arranged.

In this embodiment, the proximal end of the balloon 3 is connected to the second outer tube 22, and the distal end of the balloon 3 is connected to the outer sidewall of the second inner tube 21, for example, the proximal end of the balloon 3 is connected to the distal end of the second outer tube 22 in a sealing manner, and the distal end of the balloon 3 is connected to the outer sidewall of the second inner tube 21 in a sealing manner. In a specific embodiment, the proximal end of the balloon 3 is bonded or welded to the distal end of the second outer tube 22, and the distal end of the balloon 3 is bonded or welded to the outer sidewall of the second inner tube 21. In a particular embodiment, the proximal end of the balloon 3 is connected to the end of the distal end of the second outer tube 22 and the distal end of the balloon 3 is connected to the outer side wall of the second inner tube 21, so that the medium in the expanded state of the balloon 3 can only enter the interior of the balloon 3 through the second outer tube 22, so that the interior of the second inner tube 21 cannot communicate with the balloon 3. In the present embodiment, the connection mode of the proximal end of the balloon 3 is not limited as long as the medium in the second outer tube 22 can flow into the balloon 3.

In use, the balloon 3 is required to be in an expanded state, i.e. a first passage is formed between the first outer tube 12 and the second inner tube 21, and a second passage is formed between the second outer tube 22 and the second inner tube 21, the first passage and the second passage communicating to form a passage communicating with the balloon 3, and a medium is introduced into the passage to keep the balloon 3 in the expanded state. Specifically, the proximal end of the balloon 3 is connected with the second outer tube 22 in a sealing manner (to prevent the medium from leaking from the connection between the balloon 3 and the second outer tube 22), and the distal end of the balloon 3 is connected with the outer side wall of the second inner tube 21 in a sealing manner (to prevent the medium from leaking from the connection between the balloon 3 and the second inner tube 21), wherein the channel is a channel which is communicated with the balloon 3 and sealed at the distal end. Liquid or gas is injected into the balloon 3 through the channel to place the balloon 3 in an expanded state.

Specifically, when a medium (liquid or gas) is passed through the balloon 3, the balloon 3 is in an expanded state, and the expanded balloon 3 can act on the eustachian tube to perform an expansion operation on the eustachian tube. After the liquid in the balloon 3 flows out or the gas in the balloon 3 is discharged, the balloon 3 is in a contracted state. Specifically, since the first outer tube 12 and the second outer tube 22 are communicated, the proximal end of the balloon 3 is connected to the second outer tube 22, and the distal end of the balloon 3 is connected to the outer side wall of the second inner tube 21, after liquid or gas is introduced into the first outer tube 12, the introduced liquid or gas is injected into the balloon 3 through the second outer tube 22, and as the pressure in the balloon 3 increases, the balloon 3 expands to expand the eustachian tube.

After the balloon 3 is in the expanded state, the balloon catheter is operated to separate the first catheter 1 and the second catheter 2, and the first catheter 1 is pulled out from the eustachian tube, and a check valve 5 is provided in the second catheter 2 in order to prevent the medium in the balloon 3 from flowing out from the distal end of the second catheter 2 to the proximal end of the second catheter 2. After the first catheter and the second catheter are in a separated state, the one-way valve and the balloon are both placed in the eustachian tube, the one-way valve 5 allows the medium in the second outer tube 22 to pass through the far end of the balloon 3, namely the one-way valve 5 allows the medium in the second outer tube 22 to flow from the near end of the balloon to the far end of the balloon, and the medium in the balloon 3 is prevented from flowing out of the one-way valve 5 from the far end of the balloon 3.

In the prior art, the pipe is inseparable connection, and when using, in the eustachian tube was all put into to pipe and sacculus 3, and when sacculus 3 stopped in the eustachian tube, need the operation doctor steadily to hold the used nose guide ware of leading into sacculus 3 always, implementing the expansion postoperative to the eustachian tube, pipe intercommunication sacculus 3 was taken out from the eustachian tube together, and sacculus 3 is shorter in patient's eustachian tube dwell time. In the embodiment of the application, the first catheter 1 and the second catheter 2 are detachably connected, the balloon 3 is arranged on the second catheter 2, when the eustachian tube dilator is used, the first catheter 1, the second catheter 2 and the balloon 3 are all arranged in the eustachian tube, after the balloon 3 is expanded, the first catheter 1 is drawn out from the eustachian tube (at the moment, the balloon 3 and the second catheter 2 cannot be drawn out from the eustachian tube), the second catheter 2 provided with the balloon 3 is arranged in the eustachian tube, the balloon 3 can stay in the eustachian tube for a long time, and the expansion effect of the eustachian tube is improved. In addition, in the embodiment of the application, a one-way valve 5 is arranged at the proximal end of the balloon, the one-way valve 5 is connected with the second catheter, and the one-way valve 5 prevents the medium in the balloon 3 from flowing out of the one-way valve 5 from the distal end of the balloon 3.

In one embodiment, as shown with reference to fig. 5 and 6, the balloon catheter further comprises a connector 6, the connector 6 being connected to the proximal end of the catheter, e.g. the connector 6 is a Y-luer. The main lumen of the connector 6 communicates with the first inner tube 11 of the first catheter 1 and the side lumen of the connector 6 communicates with the first outer tube 12 of the first catheter 1. After the catheter connected with the balloon is placed into a eustachian tube, the pressure pump is connected through a Y-shaped luer connector, and a medium is injected into the balloon 3. As the pressure increases, the balloon 3 expands and thus expands the eustachian tube. After expansion of the eustachian tube, other operations can be performed through the first and second

inner tubes

11, 21 of the catheter, such as infusion into the middle ear through the first and second

inner tubes

11, 21, and flushing of the middle ear. Then, the pressure of the pressure pump is removed, the Y-shaped luer connector is rotated or pulled, and the first catheter 1 and the second catheter 2 are disconnected at the connection position, so that the second catheter 2, the balloon 3 and the one-way valve 5 are retained in the eustachian tube, the time for placing the balloon 3 in the eustachian tube is prolonged, and the expansion effect of the eustachian tube is improved.

In one embodiment, a first connection portion is provided on an inner surface of the first outer tube 12, a second connection portion is provided on an outer surface of the second outer tube 22, the first and second connection portions are detachably connected, and the first and second

inner tubes

11 and 21 are detachably connected.

In this embodiment, in order to achieve the detachable connection of the first guide tube 1 and the second guide tube 2, the first outer tube 12 and the second outer tube 22 are detachably connected, while the first inner tube 11 and the second inner tube 21 are detachably connected. Specifically, a first connecting portion is disposed on an inner surface of the first outer tube 12, a second connecting portion is disposed on an outer surface of the second outer tube 22, and the first outer tube 12 is sleeved outside the second outer tube 22, so that the first outer tube 12 and the second outer tube 22 are detachably connected by the first connecting portion and the second connecting portion. For example, a first connection portion is provided on the inner surface of the distal end region of the first outer tube 12, and a second connection portion is provided on the outer surface of the proximal end region of the second outer tube 22. In a specific embodiment, the first connection portion is an internal thread, the second connection portion is an external thread, and the first outer tube 12 and the second outer tube 22 are detachably connected by a threaded connection. Or in another specific embodiment, the first connecting portion is a sliding slot, the second connecting portion is a sliding block, and the first outer tube 12 and the second outer tube 22 are detachably connected through a sliding connection.

The first connecting portion are used as internal threads, the second connecting portion are used as external threads for explanation, in specific use, the near end of the balloon catheter is connected with the connector 6, the connector 6 is rotated, the first catheter 1 is rotated to unscrew the internal threads and the external threads, the first catheter 1 is pulled towards the direction far away from the far end until the first inner tube 11 and the second inner tube 21 fall off, the first catheter 1 and the second catheter 2 are separated at the moment, the first catheter 1 can be pulled out from the eustachian tube, and the second catheter 2 is continuously retained in the eustachian tube, so that the eustachian tube expansion effect is improved.

In one embodiment, referring to fig. 1 and 2, the first catheter 1 further includes a separation member 4, a proximal end of the separation member 4 is fixedly connected to the first outer tube 12, a third connection portion 41 is disposed on an inner surface of the separation member 4, a fourth connection portion 223 is disposed on an outer surface of the second outer tube 22, the third connection portion 41 and the fourth connection portion 223 are detachably connected, and the first inner tube 11 and the second inner tube 21 are detachably connected.

In this embodiment, in order to achieve detachable connection of the first catheter 1 and the second catheter 2, a detaching member 4 is provided at the distal end of the first outer tube 12, and the second outer tube 22 is detachably connected to the detaching member 4. Specifically, the separating member 4 is fixedly connected to the distal end of the first outer tube 12, a third connecting portion 41 is provided on the inner surface of the separating member 4, a fourth connecting portion 223 is provided on the outer surface of the second outer tube 22, and the separating member 4 is fitted over the second outer tube 22, so that the separating member 4 and the second outer tube 22 are detachably connected by the third connecting portion 41 and the fourth connecting portion 223. For example, the third connecting portion 41 is provided on the inner surface of the separating member 4, and the fourth connecting portion 223 is provided on the outer surface of the proximal end region of the second outer tube 22. In a specific embodiment, the third connecting portion 41 is an internal thread, the fourth connecting portion 223 is an external thread, and the separating member 4 and the second outer tube 22 are detachably connected by a threaded connection. Or in another specific embodiment, the third connecting portion 41 is a sliding slot, the fourth connecting portion 223 is a sliding block, and the separating member 4 and the second outer tube 22 are detachably connected through a sliding connection.

In one embodiment, referring to fig. 2, the first inner pipe 11 and the second inner pipe 21 are connected in a sleeved manner.

In this embodiment, in order to realize the separable connection between the first catheter 1 and the second catheter 2, the first outer tube 12 and the second outer tube 22 are connected in a separable manner by a threaded connection or a sliding connection, and the first inner tube 11 and the second inner tube 21 are connected in a separable manner by a sleeve connection. Specifically, the second inner tube 21 is sleeved outside the first inner tube 11, so that part of the first inner tube 11 is located in the second inner tube 21; or the first inner tube 11 is sleeved outside the second inner tube 21, so that part of the second inner tube 21 is positioned in the first inner tube 11.

In use, taking the first outer tube 12 and the second outer tube 22 as an example for explanation, in specific use, the connector 6 is connected to the proximal end of the balloon catheter, and the first catheter 1 is rotated to unscrew the internal thread and the external thread by rotating the connector 6, and the first catheter 1 is pulled in a direction away from the distal end until the first inner tube 11 and the second inner tube 21 fall off, at this time, the first catheter 1 and the second catheter 2 are separated, so that the first catheter 1 can be drawn out from the eustachian tube, and the second catheter 2 is continuously retained in the eustachian tube, so as to improve the eustachian tube expansion effect.

In a particular embodiment, and with reference to fig. 2, the first inner tube 11 has a tip section with an inner diameter that decreases in size in a proximal-to-distal direction of the first inner tube 11; the second inner tube 21 has a head section in which the inner diameter size is gradually reduced from the proximal end to the distal end of the second inner tube 21, and the tip section is inserted.

In this embodiment, the first inner tube 11 has a distal end section which is far from the proximal end of the first inner tube 11, and the inner diameter of the distal end section gradually decreases in size in the proximal-to-distal direction of the first inner tube 11, i.e. the distal end section is tapered like a cone. In order to match the shape of the end section of the first inner tube 11, the second inner tube 21 has a head section which is remote from the distal end of the second inner tube 21, and the inner diameter dimension of the head section is gradually reduced in the proximal-to-distal direction of the second inner tube 21. In use, the terminal section of the first inner pipe 11 is inserted into the head end section of the second inner pipe 21, when the first and second guide pipes 1 and 2 need to be separated, the separation of the first and second

inner pipes

11 and 21 is facilitated because the terminal section of the first inner pipe 11 is inserted into the head end section of the second inner pipe 21.

In one embodiment, a through hole is formed on the outer side wall of the second outer tube 22, and the distal end of the second outer tube 22 is connected with the outer side wall of the second inner tube 21 in a sealing manner;

the proximal end of the balloon 3 is connected to the outer side wall of the second outer tube 22, and the through hole communicates with the inside of the balloon 3.

In this embodiment, the proximal end of the balloon 3 is not connected to the distal end of the second outer tube 22, the proximal end of the balloon 3 is connected to the outer sidewall of the second outer tube 22, and the distal end of the second outer tube 22 is sealingly connected to the outer sidewall of the second inner tube 21. When the proximal end of the balloon 3 is connected to the outer side wall of the second outer tube 22, the medium in the second outer tube 22 flows into the balloon 3 through the through holes, so that the balloon is in an expanded state.

In one embodiment, as shown with reference to fig. 1, 3 and 4, the second outer tube 22 includes a first sub-outer tube 221 and a second sub-outer tube 222. The proximal end of the first sub-outer tube 221 is detachably connected to the first outer tube 12, and the distal end of the first sub-outer tube 221 is connected to the inlet end of the one-way valve 5. The proximal end of the second sub-outer tube 222 is connected with the outlet end of the one-way valve 5, and the distal end of the second sub-outer tube 222 is connected with the balloon 3.

In this embodiment, the second outer tube 22 includes a first sub-outer tube 221 and a second sub-outer tube 222 connected by a check valve 5, and a proximal end of the first sub-outer tube 221 is detachably connected to a distal end of the first outer tube 12. The distal end of the first sub-outer tube 221 is connected to the inlet end of the one-way valve 5, the proximal end of the second sub-outer tube 222 is connected to the outlet end of the one-way valve 5, and the distal end of the second sub-outer tube 222 is connected to the proximal end of the balloon 3.

Specifically, a first channel is formed between the first inner pipe 11 and the first outer pipe 12, a first sub-channel is formed between the first sub-outer pipe 221 and the second inner pipe 21, a second sub-channel is formed between the second sub-outer pipe 222 and the second inner pipe 21, and the first sub-channel and the second sub-channel form a second channel;

in use, a medium is injected into the catheter through the first channel formed between the first outer tube 12 and the first inner tube 11, through the first channel, and the first sub-channel, to the one-way valve 5, through the one-way valve 5 into the second sub-channel, and through the second sub-channel into the balloon 3. After the first catheter 1 is separated from the second catheter 2, the one-way valve 5 is arranged between the first sub-outer tube 221 and the second sub-outer tube 222, so that the medium in the balloon 3 is prevented from flowing out.

In one embodiment, referring to fig. 3 and 4, the check valve 5 includes a check valve body 51 and an elastic valve sheet 52, the check valve body 51 is connected to the second outer pipe 22, and the elastic valve sheet 52 is disposed in the check valve body 51 and sleeved on the second inner pipe 21;

the elastic valve plate 52 has a first state and a second state, the elastic valve plate 52 is in the first state, and the one-way valve 5 allows the far end of the balloon 3 to be accessed; the resilient valve member 52 is in the second state, and the one-way valve 5 prevents the medium from passing from the distal end of the balloon 3 to the proximal end of the second outer tube 22.

Specifically, referring to fig. 3, the elastic valve sheet 52 is in the first state, the elastic valve sheet 52 is in an arc-shaped structure, the arc-shaped structure is recessed towards the proximal direction of the second conduit 2, and a gap is formed between the elastic valve sheet 52 and the check valve body 51. Referring to fig. 4, the elastic valve sheet 52 is in the second state, and the elastic valve sheet 52 abuts against the inner surface of the check valve body 51.

In this embodiment, the one-way valve 5 comprises a one-way valve body 51 and an elastic valve sheet 52, and the elastic valve sheet 52 can be elastically deformed to allow the medium to pass from the proximal end of the second catheter 2 to the distal end of the balloon 3 to prevent the medium from passing from the distal end of the balloon 3 to the proximal end of the second catheter 2. In an alternative embodiment, the inner diameter of the check valve body 51 is larger than the inner diameter of the second outer tube 22, and the resilient blade 52 is disposed near the inlet end of the check valve 5, so that when the resilient blade 52 is in the first state, the medium can enter the check valve 5 from the inlet end of the check valve 5 and flow into the balloon 3. In an alternative embodiment, the material of the resilient sheet 52 is rubber, so that the resilient sheet 52 is elastically deformed.

Specifically, an elastic valve plate 52 is arranged in the check valve 5, the elastic valve plate 52 surrounds the second inner pipe 21 and is fixedly connected with the second inner pipe 21, the outer diameter of the elastic valve plate 52 is matched with that of the check valve 5, and the outer wall of the elastic valve plate 52 is in contact with the near-end wall of the check valve 5. When the medium flows from the near end to the far end, the medium acts on the elastic valve plate 52 and jacks up the elastic valve plate 52, so that a gap is formed between the elastic valve plate 52 and the one-way valve body 51, and the medium is allowed to be injected into the balloon 3; when the medium flows from the far end to the near end, the medium acts on the elastic valve sheet 52, and the elastic valve sheet 52 is in close contact with the inner wall of the check valve body 51 (the elastic valve sheet 52 is in close contact with the near side wall of the check valve body 51, and the elastic valve sheet 52 is in close contact with the top inner wall and the bottom inner wall of the check valve body 51) so that the elastic valve sheet 52 is pressed by the medium more tightly and the medium cannot pass through.

In a specific embodiment, referring to fig. 2-4, the distal end of the first outer sub-tube 12 is connected to the separation member 4, the distal end of the separation member 4 is connected to the proximal end of the first outer sub-tube 221, the distal end of the first outer sub-tube 221 is connected to the inlet end of the one-way valve 5, the proximal end of the second outer sub-tube 222 is connected to the outlet end of the one-way valve 5, and the distal end of the second outer sub-tube 222 is connected to the proximal end of the balloon 3. That is, the check valve 5 is provided between the separating member 4 and the balloon 3, and when the first catheter 1 and the second catheter 2 are separated, the junction of the first outer sub-tube 12 and the first outer sub-tube 221 is disconnected, and the first inner tube 11 and the second inner tube 21 are disconnected, so that the first outer sub-tube 221, the check valve 5, the second outer sub-tube 222, the second inner tube 21, and the balloon 3 are all placed in the eustachian tube to perform the dilation operation on the eustachian tube.

In one embodiment, the material of the second inner tube 21 is degradable material, or the materials of the second inner tube 21 and the second outer tube 22 are both degradable material.

In this embodiment, after the first catheter 1 and the second catheter 2 are separated, the second catheter 2 and the expanded balloon 3 are placed in the eustachian tube, because the material of the second inner tube 21 is degradable material, or the material of the second inner tube 21 and the material of the second outer tube 22 are both degradable material, after a period of time, the second inner tube 21 connected with the balloon 3 is degraded, the medium in the balloon 3 flows out for pressure relief, the balloon 3 can slide down from the eustachian tube, enters the esophagus along with swallowing action, and then is discharged through the alimentary canal.

In a specific embodiment, the second catheter 2 includes a one-way valve 5, the one-way valve 5 being configured to allow media to flow from the proximal end of the catheter to the distal end of the catheter, and when the first catheter 1 and the second catheter 2 are separated, the second catheter 2 and the inflated balloon 3 are placed in the eustachian tube, and the one-way valve 5 is also expelled with the entire alimentary tract. For example, the overall size of the check valve 5 is controlled to allow the check valve 5 to be discharged from the human body. The non-return valve 5 may for example be a medical non-return valve.

For example, the second inner tube 21 is injection molded from a degradable PLA material, or both the second inner tube 21 and the second outer tube 22 are injection molded from a degradable PLA material. Or the material of the second inner tube 21 is degradable biomedical material, or the material of the second inner tube 21 and the material of the second outer tube 22 are both degradable biomedical material.

In the above embodiments, the differences between the embodiments are described in emphasis, and different optimization features between the embodiments can be combined to form a better embodiment as long as the differences are not contradictory, and further description is omitted here in consideration of brevity of the text.

Although some specific embodiments of the present application have been described in detail by way of illustration, it should be understood by those skilled in the art that the above illustration is only for purposes of illustration and is not intended to limit the scope of the present application. It will be appreciated by those skilled in the art that modifications may be made to the above embodiments without departing from the scope and spirit of the present application. The scope of the application is defined by the appended claims.

Claims

1. A balloon catheter, comprising: a catheter, a balloon (3), and a one-way valve (5);

in the proximal end to distal end direction of the catheter, the catheter comprises a first catheter (1) and a second catheter (2), the first catheter (1) comprises a first inner tube (11) and a first outer tube (12), the first outer tube (12) is sleeved outside the first inner tube (11), the second catheter (2) comprises a second inner tube (21) and a second outer tube (22), the second outer tube (22) is sleeved outside the second inner tube (21), the first inner tube (11) is communicated with the second inner tube (21), and the first outer tube (12) is communicated with the second outer tube (22);

the first catheter (1) and the second catheter (2) are detachably connected, the proximal end of the balloon (3) is connected with the second outer tube (22), the distal end of the balloon (3) is connected with the outer side wall of the second inner tube (21), the one-way valve (5) is connected with the second outer tube (22), the one-way valve (5) is arranged close to the proximal end of the balloon (3), and the one-way valve (5) is configured to allow a medium in the second outer tube (22) to pass into the distal end of the balloon (3).

2. The balloon catheter according to claim 1, wherein a first connecting portion is provided on an inner surface of the first outer tube (12), a second connecting portion is provided on an outer surface of the second outer tube (22), the first and second connecting portions are detachably connected, and the first and second inner tubes (11, 21) are detachably connected.

3. The balloon catheter according to claim 1, wherein the first catheter (1) further comprises a separation member (4), a proximal end of the separation member (4) is fixedly connected with the first outer tube (12), a third connecting portion (41) is provided on an inner surface of the separation member (4), a fourth connecting portion (223) is provided on an outer surface of the second outer tube (22), the third connecting portion (41) and the fourth connecting portion (223) are detachably connected, and the first inner tube (11) and the second inner tube (21) are detachably connected.

4. A balloon catheter according to claim 2 or 3, wherein said detachable means comprises one of a threaded connection, a sliding connection.

5. The balloon catheter according to claim 1, wherein the first inner tube (11) has a tip section with an inner diameter gradually decreasing in size in a proximal-to-distal direction of the first inner tube (11); the second inner pipe (21) has a head section, the inner diameter of the head section is gradually reduced in size from the proximal end to the distal end of the second inner pipe (21), and the end section is inserted into the head section.

6. The balloon catheter as claimed in claim 1, wherein the outer side wall of the second outer tube (22) is provided with a through hole, and the distal end of the second outer tube (22) is connected with the outer side wall of the second inner tube (21) in a sealing manner;

the proximal end of the balloon (3) is connected with the outer side wall of the second outer tube (22), and the through hole is communicated with the inside of the balloon (3).

7. The balloon catheter according to claim 1, wherein the second outer tube (22) comprises a first sub-outer tube (221) and a second sub-outer tube (222);

the near end of the first sub-outer tube (221) is detachably connected with the first outer tube (12), and the far end of the first sub-outer tube (221) is connected with the inlet end of the one-way valve (5);

the near end of the second sub-outer tube (222) is connected with the outlet end of a one-way valve (5), and the far end of the second sub-outer tube (222) is connected with the balloon (3).

8. The balloon catheter according to claim 1, wherein the one-way valve (5) comprises a one-way valve body (51) and an elastic valve sheet (52), the one-way valve body (51) is connected with the second outer tube (22), and the elastic valve sheet (52) is arranged in the one-way valve body (51) and sleeved on the second inner tube (21);

the elastic valve plate (52) has a first state and a second state, the elastic valve plate (52) is in the first state, and the one-way valve (5) allows a medium to pass from the near end of the second catheter (2) to the far end of the balloon (3); the elastic valve plate (52) is in a second state, and the one-way valve (5) prevents the medium from flowing into the near end of the second catheter (2) from the far end of the balloon (3).

9. The balloon catheter according to claim 8, wherein the resilient flap (52) is in the first state, the resilient flap (52) is in an arc-shaped structure, the arc-shaped structure is concave towards the proximal end of the second catheter (2), and a gap is formed between the resilient flap (52) and the one-way valve body (51);

the elastic valve plate (52) is in the second state, and the elastic valve plate (52) is abutted to the inner surface of the one-way valve body (51).

10. The balloon catheter according to claim 1, characterized in that the material of the second inner tube (21) is degradable material, or the material of the second inner tube (21) and the material of the second outer tube (22) are degradable material.