CN219290370U - Double-cavity bronchial catheter - Google Patents

Abstract

The utility model relates to the technical field of medical equipment, in particular to a double-cavity bronchial catheter which comprises a joint, a non-operative side pulmonary external connecting pipe, an operative side pulmonary external connecting pipe, a double-cavity ventilation main pipe and a one-way breathing valve; the connector is provided with a main pipe, a first branch pipe and a second branch pipe, the first branch pipe and the second branch pipe are communicated with the main pipe, and the main pipe is used for connecting a breathing circuit and a breathing machine; one end of the non-operative side pulmonary external connecting pipe is connected with the double-cavity ventilation main pipe, and the other end is connected with the first branch pipe; one end of the operation side pulmonary external connecting pipe is connected with the double-cavity ventilation main pipe; when single lung ventilation is needed, the other end of the operation side lung external connection pipe is connected with the air inlet end of the one-way breather valve, and the second branch pipe is closed. Single lung ventilation using the dual lumen bronchial catheter can accelerate collapse of the lung on the operative side. And the operation is simple in the process, and the anesthesiologist does not need to stare at each step of operation of the operating doctor to perform timely operation, so that the workload is reduced, and the anesthesiologist can perform more comprehensive anesthesia management on the patient at the stage.

Description

Double-cavity bronchial catheter

Technical Field

The utility model relates to the technical field of medical instruments, in particular to a double-cavity bronchial catheter.

Background

Chest procedures often require collapse of the lung on the side of the procedure, which requires the use of single lung ventilation techniques. Lung collapse during single lung ventilation involves two phases. The first phase is the rapid collapse phase: when the pleura opens, the atmosphere enters the chest cavity, and the lung collapses rapidly under the effect of its inherent elastic recoil, which is short, lasting for about one minute. The second phase is the slow collapse phase, which is also the main phase of lung collapse, and as the lung collapses rapidly, the small airways begin to close and passive collapse ceases, and lung collapse is mainly dependent on the dispersion and absorption of the remaining gases in the lung. Oxygen is rapidly absorbed in the alveoli due to its solubility and binding properties with hemoglobin, and any cartilage cannot support the alveoli after the pulmonary capillary bed absorbs oxygen, so that lung collapse occurs. Pure oxygen ventilation is beneficial in accelerating lung collapse.

The effective single-lung ventilation lung collapse can be beneficial to smooth operation of thoracoscopy, reduces the occurrence probability of hypoxia during operation, and is beneficial to anesthesia management during operation, wherein the double-cavity bronchial cannula is a classical technical scheme of single-lung ventilation. Existing double lumen bronchial intubation techniques often open a side bronchial (or tracheal) tube for single lung ventilation prior to pleural cavity opening. In this way, the ventilation side lung mediastinum is displaced in the closed pleural cavity, resulting in passive ventilation of the non-ventilation side lung with a median ventilation of 134 (65-265) ml. The earlier the operation side bronchus (or trachea) catheter is opened to ventilate a single lung, the more air is inhaled into the operation side lung, and nitrogen in the air can delay lung collapse due to the characteristic of slower absorption of the nitrogen, and simultaneously the nitrogen can reduce oxygen partial pressure, so that anoxic pulmonary vasoconstriction reaction is caused, further the lung collapse is delayed, and the lung collapse is not favored.

In order to solve the problem of lung collapse delay caused by passive ventilation, two improvements of pre-single lung ventilation and suspended respiration are proposed, the pre-single lung ventilation: after the patient turns over to the lateral position and performs double-cavity trachea cannula alignment again, immediately clamping the joint branch pipe connected with the operation side bronchus (or trachea) catheter until the pleura is opened, disconnecting the connection between the operation side bronchus (or trachea) catheter and the joint branch pipe, and keeping the time from clamping to the pleura opening to be more than 6min; pause breathing method: the ventilator was disconnected at the beginning of pleural opening and ventilation was suspended for 1-4min. Experiments prove that the two schemes can shorten the time of lung collapse.

However, although the two above improvements can shorten the time for lung collapse, certain drawbacks still exist: the prior single-lung ventilation still cannot avoid the passive respiration, the air inhalation and the lung collapse delay caused by the subsequent air residues after the pleural patency and the disconnection of the operation side bronchus (or trachea) catheter and the joint branch tube; the suspended respiration method requires suspended respiration, and needs to monitor the hypoxia and hypercapnia possibly occurring in the suspended respiration process in real time, and is inconvenient for continuous inhalation of anesthetic. Meanwhile, the two improved schemes are complicated to operate, and an anesthesiologist needs to stare at each step of operation of the operating doctor so as to disconnect the connection of the branch tracheal (or tracheal) catheter and the joint branch tube or to carry out the operation of suspending the breathing method when the pleura is incised, thereby increasing the workload of the anesthesiologist and being inconvenient for carrying out other anesthesia operation management on the patient at the stage.

Disclosure of Invention

The utility model provides a double-cavity bronchial catheter which is used for solving the technical problems that in the existing single-lung ventilation and accelerating operation side lung collapse scheme, the workload of anesthesiologists is large, and the overall anesthesia management of patients is inconvenient.

The present utility model provides a double lumen bronchial catheter comprising:

the device comprises a joint, a non-operative side pulmonary external connecting pipe, an operative side pulmonary external connecting pipe, a double-cavity ventilation main pipe and a one-way breather valve;

the connector is provided with a main pipe, a first branch pipe and a second branch pipe, the first branch pipe and the second branch pipe are communicated with the main pipe, and the main pipe is used for connecting a breathing circuit and a breathing machine;

one end of the non-operative side pulmonary external connecting pipe is connected with the double-cavity ventilation main pipe, and the other end is connected with the first branch pipe;

one end of the operation side lung external connection tube is connected with the double-cavity ventilation main tube;

when ventilation of a single lung is needed, the other end of the operation side lung external connection pipe is connected with the air inlet end of the one-way breather valve, and the second branch pipe is closed.

In a first possible implementation, the one-way breathing valve comprises a body and a valve cartridge;

the main body is of a cylindrical structure, one opening end of the cylindrical structure is the air inlet end, and the other opening end is the air outlet end;

the valve core is arranged in the main body and used for controlling the communication between the air inlet end and the air outlet end.

In combination with the first possible implementation of the catheter, in a second possible implementation of the catheter, the valve cartridge comprises a closed loop and a flap;

the sealing ring is an annular structure with the outer diameter equal to the inner diameter of the cylindrical structure;

the valve body is a valve which is arranged around the inner ring of the closed ring in a surrounding way, when the inside of the main body is positive air pressure, the valve is opened, and when the inside of the main body is negative air pressure, the valve is closed;

the outer peripheral surface of the closed ring is connected with the inner peripheral surface of the cylindrical structure.

In combination with the second possible implementation of the catheter, in a third possible implementation of the catheter, the body is of a straight barrel configuration;

the number of valves is 2;

the valve is positioned at one side of the closed ring close to the air outlet end;

the 2 pieces of the valve are enclosed into a cone shape with two symmetrical inclined planes, the interval between the two inclined planes is smaller as the interval is closer to the air outlet end, and the minimum value of the interval is equal to or larger than zero.

In combination with any one of the first to third possible implementation of the catheter described above, in a fourth possible implementation of the catheter, the body is composed of polypropylene;

the valve core is composed of silica gel.

In combination with any one of the above possible catheters, in a fifth possible catheter, the air inlet end is detachably connected to the surgical side pulmonary extension tube.

In combination with any one of the above possible catheters, in a sixth possible catheter, when inflation of the operative side lung is required, the other end of the operative side lung extension tube is connected to the second branch tube of the connector. In combination with any one of the first to third possible implementation catheters, in a seventh possible implementation catheter, the method further includes: a sputum aspirator tube;

when the operation side lung needs to suck phlegm, the sputum suction tube passes through the operation side lung external connection tube to be communicated with the operation side lung. In combination with any one of the foregoing possible implementation of a catheter, in an eighth possible implementation of a catheter, the method further includes:

and the closing clamp is used for clamping the first branch pipe or the second branch pipe.

In combination with the eighth possible implementation of the catheter, in a ninth possible implementation of the catheter, the sealing forceps may close the second branch tube when the external pulmonary tube is connected to the air intake end of the one-way breathing valve.

From the above technical scheme, the utility model has the following advantages:

(1) the double-cavity bronchial catheter provided by the utility model is provided with a joint, a non-operative side pulmonary external connecting pipe, an operative side pulmonary external connecting pipe, a double-cavity ventilation main pipe and a one-way breathing valve; the connector is provided with a main pipe, a first branch pipe and a second branch pipe, the first branch pipe and the second branch pipe are communicated with the main pipe, and the main pipe is used for connecting a breathing circuit and a breathing machine; one end of the non-operative side pulmonary external connecting pipe is connected with the double-cavity ventilation main pipe, and the other end is connected with the first branch pipe; one end of the operation side pulmonary external connecting pipe is connected with the double-cavity ventilation main pipe; when single lung ventilation is needed, the other end of the operation side lung external connection pipe is connected with the air inlet end of the one-way breather valve, and the second branch pipe is closed. The one-way breather valve ensures that the air in the operation side lung only goes out and does not go in, realizes ventilation of the single lung, and avoids the collapse delay of the operation side lung caused by passive air suction of the operation side lung, thereby accelerating the collapse of the operation side lung. In the process, only the one-way breather valve is required to be installed timely, the operation is simple, the anesthesiologist does not need to pay attention to the operation of the operating doctor in real time to operate timely, the workload is reduced, and the anesthesiologist can perform more comprehensive anesthesia management on the patient at the stage.

(2) The one-way breather valve is arranged to ensure that the air of the lung at the operation side is only discharged, so that the first stage of lung collapse is not influenced, and the passive air suction of the lung at the operation side can be avoided, thereby avoiding the influence on the lung collapse at the second stage and accelerating the lung collapse.

(3) After the patient is placed in the lateral position and the position of the double-cavity bronchial cannula is fixed under the bronchofiberscope and sputum is sucked, the external connecting tube of the lung at the operation side is connected with the air inlet end of the one-way breather valve immediately at the end phase of expiration, and the second branch tube is closed, so that oxygen in the lung at the operation side can be absorbed as soon as possible.

(4) The ventilation process of the single lung does not need to pause breathing, can ensure the continuous inhalation of anesthetic, and simultaneously, avoids the hypoxia and the hypercarbonated blood caused by the apnea.

(5) Can be used in the lung segment excision operation by the inflation collapse method, accelerates the lung collapse after the pure oxygen is inflated to the whole lung, accelerates the occurrence of planes between the lung segments, reduces the operation time and the anesthesia time, and accelerates the recovery of patients.

Drawings

In order to more clearly illustrate the embodiments of the utility model or the technical solutions of the prior art, the drawings which are used in the description of the embodiments or the prior art will be briefly described, it being obvious that the drawings in the description below are only some embodiments of the utility model, and that other drawings can be obtained from these drawings without inventive faculty for a person skilled in the art.

FIG. 1 is a schematic view of a dual lumen bronchial catheter according to an embodiment of the present utility model;

fig. 2 is a schematic structural diagram of a unidirectional breather valve provided in an embodiment of the present utility model;

wherein: 1. double-cavity ventilation main tube 2 and non-operative side lung external tube

3. External pulmonary connecting tube 4 and joint for operation side

41. First branch pipe 42 and second branch pipe

43. Main pipe 5 and one-way breather valve

51. Body 52, closed loop

53. Valve 54, inclined plane

55. Cambered surface 6, closing pliers.

Detailed Description

The embodiment of the utility model provides a double-cavity bronchial catheter, which is used for solving the technical problems that the workload of anesthesiologists is large in the existing single-lung ventilation and accelerating operation side lung collapse scheme, and the general anesthesia management of patients is inconvenient.

In order to make the objects, features and advantages of the present utility model more obvious and understandable, the technical solutions of the embodiments of the present utility model will be clearly and completely described below with reference to the drawings in the embodiments of the present utility model, and it is apparent that the embodiments described below are only some embodiments of the present utility model, not all embodiments of the present utility model. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

In the description of the embodiments of the present application, it should be noted that, directions or positional relationships indicated by terms such as "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., are based on directions or positional relationships shown in the drawings, are merely for convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific direction, be configured and operated in the specific direction, and thus should not be construed as limiting the embodiments of the present application. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the embodiments of the present application, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, interchangeably connected, integrally connected, mechanically connected, electrically connected, directly connected, indirectly connected through an intermediary, or in communication between two elements. The specific meaning of the terms in the embodiments of the present application will be understood by those of ordinary skill in the art in a specific context.

The prior single-lung ventilation still cannot avoid the passive respiration after the pleura is opened and the connection of the branch tube of the operation side bronchus (or trachea) catheter and the joint branch tube is disconnected, and the subsequent lung collapse delay caused by air residues; the suspended respiration method requires suspended respiration, and needs to monitor the hypoxia and hypercapnia possibly occurring in the suspended respiration process in real time, and is inconvenient for continuous inhalation of anesthetic. Meanwhile, the two improved schemes are complicated to operate, and an anesthesiologist needs to stare at each step of operation of the operating doctor so as to disconnect the connection of the branch tracheal (or tracheal) catheter and the joint branch tube or to carry out the operation of suspending the breathing method when the pleura is incised, thereby increasing the workload of the anesthesiologist and being inconvenient for carrying out other anesthesia operation management on the patient at the stage.

Referring to fig. 1 to 2, a dual-lumen bronchial catheter according to an embodiment of the utility model includes:

the device comprises a joint 4, a non-operative side pulmonary external connecting pipe 2, an operative side pulmonary external connecting pipe 3, a double-cavity ventilation main pipe 1 and a one-way breathing valve 5; the joint is provided with a main pipe 43, a first branch pipe 41 and a second branch pipe 42, the first branch pipe 41 and the second branch pipe 42 are communicated with the main pipe 43, and the main pipe 43 is used for connecting a breathing circuit and a breathing machine; one end of the non-operative side lung external tube 2 is connected with the double-cavity ventilation main tube 1, and the other end is connected with the first branch tube 41; one end of the operation side lung external connection tube 3 is connected with the double-cavity ventilation main tube 1, and the other end is connected with the second branch tube 42; when ventilation of a single lung is required, the other end of the operation side lung external connection tube 3 is disconnected with the second branch tube 42, the other end of the operation side lung external connection tube 3 is connected with the air inlet end of the one-way breather valve 5, and the second branch tube 42 is closed.

It should be noted that: the double-cavity ventilation main pipe 1 is used for being inserted into the trachea and the lung of a human body and is integrated by a bronchial catheter and an tracheal catheter, under the working state, the tail end of the bronchial catheter is positioned in a bronchus, the tail end of the tracheal catheter is positioned in a trachea, when the bronchial catheter is communicated with the lung at the non-operative side, the tracheal catheter is communicated with the lung at the operative side, when the bronchial catheter is communicated with the lung at the operative side, the tracheal catheter is communicated with the lung at the non-operative side, namely, the object communicated by the bronchial catheter and the tracheal catheter is exchangeable, and a specific communication mode is determined mainly according to the operation requirement, the habit and preference of an anesthesiologist and whether the opening of the right upper leaf of a patient has variation. For ease of description and understanding, the following description will be given by taking an example of a bronchial catheter communicating with the non-operative side lung (i.e., the distal end of the bronchial catheter is located in the bronchi connected to the non-operative side lung), and an tracheal catheter communicating with the operative side lung (i.e., the distal end of the tracheal catheter is located in the bronchi).

The joint 4 is a double-cavity tracheal catheter joint 4, and the first branch pipe 41 and the second branch pipe 42 of the joint are communicated with the main pipe 43 of the joint to form a three-way pipe shape, wherein the joint corresponding to the main pipe 43 is a threaded pipe joint or an artificial nose joint and is used for being connected with equipment such as an anesthesia machine, a breathing machine and the like; the interface corresponding to the first branch pipe 41 is a catheter interface and is used for airtight connection with the non-operative side lung external connection pipe 2; the interface corresponding to the second branch pipe 42 is also a catheter interface and is used for airtight connection with the external pulmonary connecting pipe 3 at the operation side.

The non-operative side pulmonary external tube 2 is used to communicate a bronchial catheter communicating with the non-operative side lung with the first branch tube 41 of the fitting 4.

The outside air duct 3 for the operation side lung is used for communicating an endotracheal tube communicating with the operation side lung with the one-way breathing valve 5, or for communicating an endotracheal tube communicating with the operation side lung with the second branch duct 42 of the joint 4. More specifically, when single-lung ventilation is needed, after the patient swings the lateral position and the position of the double-cavity trachea cannula is fixed under the bronchoscope again and sputum is sucked, the external tube 3 of the operation side lung is connected with the air inlet end of the one-way breather valve 5 immediately in the end-expiration phase, and the second branch tube 42 is closed, so that the air in the operation side lung is only discharged and not fed, and the passive air suction of the operation side lung is avoided; when the operation side lung needs to be inflated, the one-way breather valve 5 is taken down, the operation side lung external connection tube 3 is communicated with the second branch tube 42 of the joint 4, and the closing forceps 6 are loosened to clamp the second branch tube 42.

The one-way breather valve 5 is used for controlling the circulation of gas, wherein the gas can only flow from the gas inlet end to the gas outlet end, but cannot flow from the gas outlet end to the gas inlet end, so that the gas in the operation side lung connected with the operation side lung external connection tube 3 can only go out and not go in through connecting the gas inlet end of the one-way breather valve 5 with the operation side lung external connection tube 3. The shape and configuration of the one-way breathing valve 5 are not particularly limited, and any gas valve that can achieve one-way ventilation may be employed.

The beneficial effects of this embodiment include:

(1) the affected side external connection tube 3 is connected with the air inlet end of the one-way breathing valve 5, and after the second branch tube 42 is closed, the one-way breathing valve 5 ensures that the air in the operation side lung only goes out, so that single-lung ventilation is realized, and the collapse delay of the operation side lung caused by the passive air suction of the operation side lung is avoided, thereby accelerating the collapse of the operation side lung. In the process, only the one-way breather valve 5 is required to be installed timely, the operation is simple, the anesthesiologist does not need to stare at each operation of the operating doctor to operate timely, the workload is reduced, and the anesthesiologist can perform more comprehensive anesthesia management on the patient at the stage.

(2) By arranging the one-way breather valve 5, the air of the lung at the operation side is only discharged and not fed in, so that the first stage of lung collapse is not influenced, and the passive air suction of the lung at the operation side can be avoided, thereby avoiding the influence on the lung collapse at the second stage and accelerating the lung collapse.

(3) After the patient is placed in the lateral position and the position of the double-cavity bronchus intubation is fixed under the bronchofiberscope again and sputum is sucked, the external tube 3 of the operation side lung is connected with the air inlet end of the one-way breather valve 5 immediately in the end expiration phase, and the second branch tube 42 is closed, so that oxygen in the operation side lung can be absorbed as soon as possible.

(4) The ventilation process of the single lung does not need to pause breathing, can ensure the continuous inhalation of anesthetic, and simultaneously, avoids the hypoxia and the hypercarbonated blood caused by the apnea.

(5) Can be used in the lung segment excision operation by the inflation collapse method, accelerates the lung collapse after the pure oxygen is inflated to the whole lung, accelerates the occurrence of planes between the lung segments, reduces the operation time and the anesthesia time, and accelerates the recovery of patients.

One preferred embodiment of the one-way breather valve 5: the one-way breather valve 5 includes a main body 51 and a spool; the main body 51 is a cylindrical structure, one opening end of the cylindrical structure is an air inlet end, the other opening end is an air outlet end, the cylindrical structure can be a straight cylinder or a curved cylinder, the cross section shape of the cylindrical structure is not particularly limited, and the cylindrical structure can be set as required; the valve core is disposed in the main body 51 and is used for controlling the communication between the air inlet end and the air outlet end, i.e. allowing the air to flow from the air inlet end to the air outlet end, and not allowing the air to flow from the air outlet end to the air inlet end, where the valve core may be electric or pneumatic, such as: the valve core comprises a closed ring 52 and a valve body; the seal ring 52 has an annular structure with an outer diameter equal to the inner diameter of the cylindrical structure; the valve body is a valve 53 which is arranged around the inner ring of the closed ring 52 in a surrounding manner, when the inside of the main body 51 is positive air pressure, the valve 53 is opened under the action of the air pressure to enable air to flow from the air inlet end to the air outlet end, when the inside of the main body 51 is reverse air pressure, the valve 53 is closed under the action of the air pressure to prevent the air from flowing from the air outlet end to the air inlet end, the positive air pressure is the air pressure direction and points from the air inlet end to the air outlet end, and the reverse air pressure is the air pressure direction and points from the air outlet end to the air inlet end; the outer peripheral surface of the closed ring 52 is connected to the inner peripheral surface of the tubular structure, so that the gas can flow only through the hollow region of the closed ring 52. Exemplary: as shown in fig. 2, the main body 51 has a straight cylindrical structure; the number of valves 53 is 2; valve 53 is located on the side of closed loop 52 near the air outlet end; the 2-piece valve 53 is enclosed into a cone shape with two symmetrical inclined planes 54, the interval between the two inclined planes 54 is smaller as the interval is closer to the air outlet end, the minimum value of the interval is equal to zero or larger than zero, when the minimum value of the interval is zero, the right ends of the two inclined planes 54 are tightly attached under the action of reverse air pressure, and when the minimum value of the interval is larger than zero, the right ends of the two inclined planes 54 are separated under the action of forward air pressure; one end of the inclined surface 54, which is close to the closed ring 52, is connected with the right end surface of the closed ring 52 through an arc surface 55, and the bending radius of the arc surface 55 is slightly larger than the inner diameter of the closed ring 52 so as to seal and enclose the inner ring of the closed ring 52. More specifically, the main body 51 of the one-way breathing valve 5 is made of polypropylene; the valve core is made of silica gel, so that the valve 53 can be ensured to deform under the drive of gas, and the gas is allowed to only go out and not go in.

Specifically, the air inlet end is detachably connected with the external pulmonary connecting tube 3, so that the one-way breather valve 5 can be removed after the lung is completely collapsed, and the external pulmonary connecting tube 3 can be connected with the second branch tube 42 for ventilation or the sputum suction tube can be inserted into the external pulmonary connecting tube 3 for sputum suction and other operations.

Specifically, the double lumen bronchial catheter is further provided with a sputum aspirator tube (not shown in the figure) for aspirating sputum. When the operation side lung needs to suck phlegm, the one-way breather valve 5 is taken down, the phlegm sucking pipe passes through the operation side lung external pipe 3 and is inserted into the operation side lung, so that the phlegm sucking pipe is communicated with the operation side lung, and the phlegm sucking operation can be performed.

In particular, the double lumen bronchial catheter is further provided with a closing clamp 6 for clamping the first branch tube 41 or the second branch tube 42 of the fitting 4. When the operation side lung external connection tube 3 is connected with the one-way breather valve 5, the second branch tube 42 is clamped by the closing forceps 6 to perform single-lung ventilation, so as to avoid the air leakage of the breathing circuit.

While the present utility model has been described in detail with respect to a dual lumen bronchial catheter, those skilled in the art will recognize that the scope of the present utility model is not limited to the embodiments and applications of the present utility model.

Claims (10)

1. A dual lumen bronchial catheter comprising:

the device comprises a joint, a non-operative side pulmonary external connecting pipe, an operative side pulmonary external connecting pipe, a double-cavity ventilation main pipe and a one-way breather valve;

the connector is provided with a main pipe, a first branch pipe and a second branch pipe, the first branch pipe and the second branch pipe are communicated with the main pipe, and the main pipe is used for connecting a breathing circuit and a breathing machine;

one end of the non-operative side pulmonary external connecting pipe is connected with the double-cavity ventilation main pipe, and the other end is connected with the first branch pipe;

one end of the operative side pulmonary external connecting pipe is connected with the double-cavity ventilation main pipe;

when ventilation of a single lung is needed, the other end of the operation side lung external connection pipe is connected with the air inlet end of the one-way breather valve, and the second branch pipe is sealed.

2. A dual lumen bronchial catheter according to claim 1, wherein:

the one-way breather valve comprises a main body and a valve core;

the main body is of a cylindrical structure, one opening end of the cylindrical structure is the air inlet end, and the other opening end is the air outlet end;

the valve core is arranged in the main body and is used for controlling the communication between the air inlet end and the air outlet end.

3. A dual lumen bronchial catheter according to claim 2, wherein:

the valve core comprises a closed ring and a valve body;

the sealing ring is of an annular structure with the outer diameter equal to the inner diameter of the cylindrical structure;

the valve body is a valve which is arranged around the inner ring of the closed ring in a surrounding mode, when the main body is internally provided with forward air pressure, the valve is opened, and when the main body is internally provided with reverse air pressure, the valve is closed;

the outer peripheral surface of the closed ring is connected with the inner peripheral surface of the cylindrical structure.

4. A dual lumen bronchial catheter according to claim 3, wherein:

the main body is of a straight cylinder structure;

the number of valves is 2;

the valve is positioned at one side of the closed ring close to the air outlet end;

the 2 pieces of valves are enclosed into a cone shape with two symmetrical inclined planes, the interval between the two inclined planes is smaller as the interval is closer to the air outlet end, and the minimum value of the interval is equal to or larger than zero.

5. A double lumen bronchial catheter according to any of claims 2 to 4, wherein:

the body is composed of polypropylene;

the valve core is composed of silica gel.

6. A double lumen bronchial catheter according to any of claims 1 to 4, wherein:

the air inlet end is detachably connected with the operation side lung external connection pipe.

7. A double lumen bronchial catheter according to any of claims 1 to 4, wherein:

when the operation side lung needs to be inflated, the other end of the operation side lung external connection pipe is connected with the second branch pipe of the joint.

8. A double lumen bronchial catheter according to any of claims 1 to 4, further comprising: a sputum aspirator tube;

when the operation side lung needs to suck phlegm, the phlegm sucking pipe penetrates through the operation side lung external connection pipe to be communicated with the operation side lung.

9. A double lumen bronchial catheter according to any of claims 1 to 4, further comprising:

and the closing clamp is used for clamping the first branch pipe or the second branch pipe.

10. A dual lumen bronchial catheter according to claim 9, wherein:

when the operation side pulmonary external connection pipe is connected with the air inlet end of the one-way breather valve, the closed forceps clamp the second branch pipe.

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