CN118649326A - A single lung ventilation device - Google Patents

Abstract

The present invention relates to the field of medical equipment technology, and in particular to a single-lung ventilation device, comprising a protection mechanism, wherein a catheter mechanism is arranged inside the protection mechanism, the protection mechanism and the catheter mechanism are connected to three inflation mechanisms, one end of the outer liner tube is fixedly connected to the lower side of the interior of a fixing seat, and the other end of the outer liner tube is fixedly connected to the middle and lower side of the interior of an inner liner tube. When the inner liner tube moves, the inner liner tube pushes the outer liner tube through an air ring, so that the outer liner tube located inside the lower side of the inner liner tube continues to turn outward along the moving direction of the inner liner tube, thereby reducing the friction between the outer liner tube and the inner wall of the patient's trachea and protecting the patient's trachea. The anti-backflow ring can prevent the secretions remaining on the side walls of the inner catheter and the outer tube from flowing back, and more anti-backflow rings can effectively increase the strength of the inner catheter and the outer tube, prevent the inner catheter and the outer tube from bending and shrinking in the patient's throat, and ensure that the secretions and gas can pass through the outer tube and the inner catheter smoothly.

Description

A single lung ventilation device

Technical Field

The present invention relates to the technical field of medical equipment, and in particular to a single-lung ventilation device.

Background Art

Single-lung ventilation technology is an indispensable technology in thoracic surgical anesthesia. Its purpose is to ensure that the healthy lung is not contaminated by blood, sputum, secretions, bacteria, etc. in the affected lung, to ensure good ventilation of the healthy lung, to avoid cross infection, to keep the affected lung relatively still, to avoid affecting surgical operations and related treatments, etc.

Currently, single-lung ventilation requires intubation. However, due to the size and hardness of the catheter, the outer wall of the catheter will rub against the inner wall of the patient's trachea or the top of the catheter will shift during intubation, which can easily damage the patient's airway mucosa. The catheter can also easily bend in the patient's throat, preventing gas from passing smoothly.

Summary of the invention

The purpose of the present invention is to solve the shortcomings of the background technology and to propose a single-lung ventilation device.

To achieve the above objectives, the technical solution adopted by the present invention is: a single-lung ventilation device, comprising a protection mechanism and three inflation mechanisms, wherein a catheter mechanism is arranged inside the protection mechanism, and the three inflation mechanisms are respectively connected to the protection mechanism and the catheter mechanism;

The protection mechanism includes a fixing seat, an outer liner, an inner liner and a second connecting ring. The fixing seat is fixed to the patient's upper lip through a tracheal tube fixer, one end of the outer liner is fixedly connected to the lower side of the fixing seat, the other end of the outer liner is fixedly connected to the middle and lower side of the inner liner, the middle part of the second connecting ring is arranged on the outer periphery of the upper end of the inner liner, and the outer side of the lower part of the second connecting ring is connected to the inner side of the upper part of the fixing seat.

Preferably, one of the inflation mechanisms is installed in the upper middle portion of the fixing seat, and a sealing ring is provided on the inner side wall of the upper middle portion of the fixing seat, and the inner side of the sealing ring is fitted to the outer periphery of the inner liner tube.

Preferably, an air ring is provided at the lower end of the inner liner tube, and the outer periphery of the air ring is arranged inside the outer liner tube.

Preferably, the end of the outer liner away from the fixing seat is arranged on the lower side of the inner liner.

Preferably, the catheter mechanism includes an inner catheter, a connecting seat, an outer sleeve, a connecting box, a suction tube, balloon one, balloon two and a connecting ring three, the upper end of the connecting seat is connected to the ventilator, the lower end of the connecting seat is fixedly connected to the upper end of the inner catheter, the upper part of the inner catheter is arranged in the middle of the outer sleeve through a bracket, the outer periphery of the outer sleeve is arranged inside the inner lining tube, one end of the suction tube is connected to the aspirator, the other end of the suction tube is connected to the connecting box, the middle part of the connecting box is arranged on the outer periphery of the inner catheter, the lower end of the connecting box is arranged on the upper end of the outer sleeve, the middle part of the connecting ring three is arranged in the middle and upper part of the outer sleeve, the outer periphery of the lower part of the connecting ring three is threadedly connected to the inner end of the upper end of the inner lining tube, the middle part of the balloon two is fixedly connected to the outer periphery of the lower end of the inner catheter, and the lower end of the balloon is fixedly connected to the outer periphery of the lower end of the outer sleeve, and the other two inflation mechanisms pass through the connecting box and are respectively connected to balloon one and balloon two.

Preferably, the outer wall of the inner conduit and the inner wall of the outer sleeve are both provided with a plurality of backflow prevention rings.

Preferably, the inflation mechanism includes an inflation tube, a needle plug and an indicator balloon, the upper end of the inflation tube is fixedly connected to the lower part of the needle plug, the needle plug is connected to the syringe, the other end of the inflation tube passes through the indicator balloon, and the inflation tube and the indicator balloon are connected to each other.

Preferably, a layer of electrochromic material is disposed on the periphery of the indicator balloon.

Compared with the prior art, the present invention has the following beneficial effects:

1. When the inner liner tube moves, the inner liner tube pushes the outer liner tube through the air ring, so that the outer liner tube located inside the lower side of the inner liner tube continues to turn outward along the moving direction of the inner liner tube, so that after the inner liner tube enters the patient's trachea, the front end of the outer liner tube is always extended, and the contact part between the outer liner tube and the inner wall of the patient's trachea will not move, thereby reducing the friction between the outer liner tube and the inner wall of the patient's trachea and protecting the patient's trachea.

2. Inflate the space between the outer liner and the inner liner through the inflation mechanism, and seal the space between the fixed seat and the inner liner through the sealing ring, so that the outer liner expands, so that the outer wall of the outer liner fits with the inner wall of the patient's trachea, thereby better sealing the patient's trachea, and through the inflated outer liner, the upper and lower ends of the inner liner are suspended in the middle of the fixed seat and the outer liner to prevent the inner liner from scratching the inner wall of the patient's trachea due to the shaking of the patient.

3. There is a groove on the upper part of the anti-backflow ring, which can prevent the secretions remaining on the side walls of the inner catheter and the outer tube from flowing back. More anti-backflow rings can effectively increase the strength of the inner catheter and the outer tube, prevent the inner catheter and the outer tube from bending and shrinking in the patient's throat, ensure the patency of the inner catheter and the outer tube, and ensure that secretions and gas can pass through the outer tube and the inner catheter smoothly.

4. When air is injected into the outer liner, balloon one and balloon two through a syringe, the indicator balloon will expand together with them, thereby changing the color of the mechanochromic material layer, so that medical staff can observe the condition of the indicator balloon more intuitively, thereby judging the gas pressure inside the outer liner, balloon one and balloon two, and preventing excessive gas filling from causing the outer liner, balloon one and balloon two to rupture.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG1 is a schematic diagram of the three-dimensional structure of a single-lung ventilation device according to the present invention;

FIG2 is a schematic diagram of the internal structure of a single-lung ventilation device according to the present invention;

FIG3 is a schematic diagram of the structure of a protection mechanism of a single-lung ventilation device according to the present invention;

FIG4 is a schematic diagram of the structure of a catheter mechanism of a single-lung ventilation device according to the present invention;

FIG5 is a schematic diagram of the structure of an outer catheter of a single-lung ventilation device according to the present invention;

FIG6 is a schematic diagram of the structure of an inner catheter of a single-lung ventilation device according to the present invention;

FIG7 is a schematic diagram of the structure of an inflation mechanism of a single-lung ventilation device according to the present invention;

FIG8 is an enlarged view of point A in FIG3 .

1. Protection mechanism; 101. Fixing seat; 102. Outer lining tube; 103. Inner lining tube; 104. Connecting ring 2; 105. Sealing ring; 106. Air ring; 2. Inflation mechanism; 201. Inflation tube; 202. Pin plug; 203. Indicator balloon; 3. Catheter mechanism; 301. Inner catheter; 302. Connecting seat; 303. Outer sleeve; 304. Connecting box; 305. Suction tube; 306. Balloon 1; 307. Balloon 2; 308. Connecting ring 3; 309. Anti-backflow ring.

DETAILED DESCRIPTION

The following description is used to disclose the present invention so that those skilled in the art can implement the present invention. The preferred embodiments described below are only examples, and those skilled in the art may think of other obvious variations.

A single-lung ventilation device as shown in Figures 1 to 8 includes a protection mechanism 1 and three inflation mechanisms 2. A catheter mechanism 3 is arranged inside the protection mechanism 1. The three inflation mechanisms 2 are respectively connected to the protection mechanism 1 and the catheter mechanism 3. In summary, the fixing seat 101 is fixed to the patient's upper lip through the endotracheal tube fixer, and then the patient's lower jaw is pried open to insert the inner liner tube 103 into the patient's trachea. When the inner liner tube 103 moves, the inner liner tube 103 pushes the outer liner tube 102 through the air ring 106, so that the outer liner tube 102 located on the lower side of the inner liner tube 103 continues to turn outward along the moving direction of the inner liner tube 103, so that after the inner liner tube 103 enters the patient's trachea, the outer liner tube 102 The front end of the liner 102 is always extended, while the contact part between the outer liner 102 and the inner wall of the patient's trachea will not move, thereby reducing the friction between the outer liner 102 and the inner wall of the patient's trachea. When the lower end of the inner liner 103 moves to the lower end of the patient's trachea close to the bronchus, the connecting ring 104 is screwed into the fixing seat 101, and the air is inflated between the outer liner 102 and the inner liner 103 through the inflation mechanism 2. The fixing seat 101 and the inner liner 103 are sealed through the sealing ring 105, so that the outer liner 102 expands, so that the outer wall of the outer liner 102 fits with the inner wall of the patient's trachea, thereby better sealing the patient's trachea, thereby fixing the protective mechanism 1 in place. The protective mechanism 1 is inserted into the patient's body to form a protective channel. After the protective mechanism 1 is fixed, the catheter mechanism 3 continues to move forward inside the protective mechanism 1, and the inner catheter 301 is extended into the bronchus on one side of the patient. Then, the connecting ring 308 is screwed into the upper end of the inner liner tube 103 to fix the catheter mechanism 3 to the protective mechanism 1. Then, the balloon 1 306 and the balloon 2 307 are inflated through the two inflation mechanisms 2. The lower end of the outer tube 303 is fixed to the tail end of the patient's trachea through the balloon 1 306, and the patient's trachea is sealed. Then, the bronchus on this side of the patient is blocked through the balloon 2 307. Finally, the connecting seat 302 is connected to the ventilator. Single-lung ventilation is thereby completed. When there is secretion in the patient's body, the suction tube 305 is connected to the aspirator, and the aspirator sucks the secretion through the outer sleeve 303. When air is injected into the outer liner 102, balloon 1 306 and balloon 2 307 through a syringe, the indicator balloon 203 will expand together with them, thereby causing the color of the mechanochromic material layer to change, so that medical staff can more intuitively observe the situation of the indicator balloon 203, thereby judging the gas pressure inside the outer liner 102, balloon 1 306 and balloon 2 307, and preventing excessive gas from being filled in, which will cause the outer liner 102, balloon 1 306 and balloon 2 307 to rupture.

The protection mechanism 1 includes a fixing seat 101, an outer liner 102, an inner liner 103 and a second connecting ring 104. The fixing seat 101 is fixed to the patient's upper lip through an endotracheal tube fixer, one end of the outer liner 102 is fixedly connected to the lower side of the fixing seat 101, and the other end of the outer liner 102 is fixedly connected to the middle and lower side of the inner liner 103. The middle part of the second connecting ring 104 is arranged on the outer periphery of the upper end of the inner liner 103, and the lower outer side of the second connecting ring 104 is connected to the upper inner side of the fixing seat 101. First, the fixing seat 101 is fixed to the patient's upper lip through the endotracheal tube fixer, and then the patient's lower jaw is opened to insert the inner liner 103 into the patient's trachea. When the inner liner 103 moves, the inner liner 103 pushes the outer liner 102 through the air ring 106, so that the outer liner 102 located inside the lower side of the inner liner 103 2 The inner liner tube 103 is continuously everted in the direction of travel, so that after the inner liner tube 103 enters the patient's trachea, the front end of the outer liner tube 102 is always extended, and the contact portion between the outer liner tube 102 and the inner wall of the patient's trachea will not move, thereby reducing the friction between the outer liner tube 102 and the inner wall of the patient's trachea. When the lower end of the inner liner tube 103 moves to the lower end of the patient's trachea close to the bronchus, the connecting ring 104 is screwed into the interior of the fixing seat 101, thereby fixing the protection mechanism 1 in the patient's body, so that the protection mechanism 1 forms a protection channel to prevent the inner wall of the patient's trachea from being damaged due to the friction between the outer tube wall and the inner wall of the patient's trachea during intubation, so that when replacing other catheter mechanisms 3, the catheter mechanism 3 can be directly inserted into the patient's trachea along the channel of the protection mechanism 1, and the replacement of the remaining catheter mechanisms 3 is more convenient and quick.

One of the inflation mechanisms 2 is installed in the middle and upper part of the fixing seat 101, and a sealing ring 105 is provided on the inner wall of the middle and upper part of the fixing seat 101. The inner side of the sealing ring 105 is fitted against the outer periphery of the inner liner tube 103. Air is inflated between the outer liner tube 102 and the inner liner tube 103 through the inflation mechanism 2, and the sealing ring 105 is used to seal the fixing seat 101 and the inner liner tube 103, so that the outer liner tube 102 expands, so that the outer wall of the outer liner tube 102 fits against the inner wall of the patient's trachea, thereby better sealing the patient's trachea, and through the expanded outer liner tube 102, the upper and lower ends of the inner liner tube 103 are suspended in the middle of the fixing seat 101 and the outer liner tube 102, to prevent the inner liner tube 103 from scratching the inner wall of the patient's trachea due to the shaking of the patient.

An air ring 106 is arranged at the lower end of the inner liner tube 103, and the outer periphery of the air ring 106 is arranged inside the outer liner tube 102. Placing the flexible air ring 106 at the front end of the inner liner tube 103 can effectively prevent the front end of the inner liner tube 103 from piercing the patient's trachea.

The end of the outer liner tube 102 away from the fixed seat 101 is arranged on the lower side of the inner liner tube 103. When the inner liner tube 103 moves, the inner liner tube 103 pushes the outer liner tube 102 through the air ring 106, so that the outer liner tube 102 located inside the lower side of the inner liner tube 103 continues to be turned outward along the moving direction of the inner liner tube 103, so that after the inner liner tube 103 enters the patient's trachea, the front end of the outer liner tube 102 is always extended, and the contact part between the outer liner tube 102 and the inner wall of the patient's trachea will not move, thereby reducing the friction between the outer liner tube 102 and the inner wall of the patient's trachea and protecting the patient's trachea.

The catheter mechanism 3 includes an inner catheter 301, a connecting seat 302, an outer sleeve 303, a connecting box 304, a sputum suction tube 305, a balloon 1 306, a balloon 2 307 and a connecting ring 308. The upper end of the connecting seat 302 is connected to the ventilator, and the lower end of the connecting seat 302 is fixedly connected to the upper end of the inner catheter 301. The upper part of the inner catheter 301 is arranged in the middle of the outer sleeve 303 through a bracket. The outer periphery of the outer sleeve 303 is arranged inside the inner liner 103. The sputum suction tube 301 is arranged in the inner liner 103. The first end of the suction tube 305 is connected to the suction device, and the other end of the suction tube 305 is connected to the connection box 304. The middle part of the connection box 304 is arranged on the outer periphery of the inner catheter 301, and the lower end of the connection box 304 is arranged on the upper end of the outer tube 303. The middle part of the connection ring 308 is arranged on the upper middle part of the outer tube 303. The outer periphery of the lower part of the connection ring 308 is threadedly connected to the inner part of the upper end of the inner liner tube 103. The middle part of the balloon 2 307 is fixedly connected to the outer periphery of the lower end of the inner catheter 301. The lower part of the balloon 1 306 is fixedly connected to the inner tube 301. The end is fixedly connected to the outer periphery of the lower end of the outer tube 303, and the other two inflation mechanisms 2 pass through the connecting box 304 and are respectively connected to balloon one 306 and balloon two 307. After the protection mechanism 1 is fixed, the catheter mechanism 3 continues to move forward inside the protection mechanism 1, and the inner catheter 301 is extended into the bronchus on one side of the patient, and then the connecting ring three 308 is screwed into the upper end of the inner liner tube 103, so as to fix the catheter mechanism 3 to the protection mechanism 1, and then the two inflation mechanisms 2 are used to expand balloon one 306 and balloon two 307, and the lower end of the outer tube 303 is fixed to the tail end of the patient's trachea through balloon one 306, and the patient's trachea is sealed, and then the bronchus on this side of the patient is blocked through balloon two 307, and finally the connecting seat 302 is connected to the ventilator to complete single-lung ventilation. When there is secretion in the patient's body, the suction tube 305 is connected to the aspirator, and the aspirator sucks the secretion through the outer tube 303.

The outer wall of the inner catheter 301 and the inner wall of the outer tube 303 are both provided with a plurality of backflow prevention rings 309, and the upper part of the backflow prevention rings 309 is provided with grooves. When the backflow prevention rings 309 are located in the vertical sections of the inner catheter 301 and the outer tube 303, the grooves on the plurality of backflow prevention rings 309 can prevent the residual secretions attached to the side walls of the inner catheter 301 and the outer tube 303 from flowing back. When the backflow prevention rings 309 are located in the horizontal section or the inclined section of the inner catheter 301 and the outer tube 303, the width of the backflow prevention rings 309 can prevent the residual secretions from flowing back. Moreover, more backflow prevention rings 309 can effectively increase the strength of the inner catheter 301 and the outer tube 303, prevent the inner catheter 301 and the outer tube 303 from bending and shrinking in the patient's throat, ensure the patency of the inner catheter 301 and the outer tube 303, and ensure that the secretions and gas can pass through the outer tube 303 and the inner catheter 301 smoothly.

The inflation mechanism 2 includes an inflation tube 201, a needle plug 202 and an indicator balloon 203. The upper end of the inflation tube 201 is fixedly connected to the lower part of the needle plug 202. The needle plug 202 is connected to the syringe. The other end of the inflation tube 201 passes through the indicator balloon 203. The inflation tube 201 and the indicator balloon 203 are connected to each other. When air is injected into the outer liner tube 102, balloon 1 306 and balloon 2 307 through the syringe, the indicator balloon 203 will expand together with them, so that medical staff can judge the gas pressure inside the outer liner tube 102, balloon 1 306 and balloon 2 307 by observing the size of the expansion of the indicator balloon 203, thereby preventing excessive gas from being filled in, which will cause the outer liner tube 102, balloon 1 306 and balloon 2 307 to rupture.

A force-chromic material layer is provided on the periphery of the indicator balloon 203. When air is injected into the outer liner 102, balloon one 306 and balloon two 307 through a syringe, the indicator balloon 203 will expand together with them, thereby causing the color of the force-chromic material layer to change, so that medical staff can observe the situation of the indicator balloon 203 more intuitively, thereby judging the gas pressure inside the outer liner 102, balloon one 306 and balloon two 307, and preventing excessive gas filling that would cause the outer liner 102, balloon one 306 and balloon two 307 to rupture.

Working principle: Fix the fixing seat 101 to the patient's upper lip through the endotracheal tube fixer, then pry open the patient's lower jaw and insert the inner liner 103 into the patient's trachea. When the inner liner 103 moves, the inner liner 103 pushes the outer liner 102 through the air ring 106, so that the outer liner 102 located inside the lower side of the inner liner 103 continues to turn outward along the moving direction of the inner liner 103, so that after the inner liner 103 enters the patient's trachea, the front end of the outer liner 102 is always extended, and the contact part between the outer liner 102 and the inner wall of the patient's trachea will not move, reducing the distance between the outer liner 102 and the inner wall of the patient's trachea Friction, when the lower end of the inner liner tube 103 moves to the lower end of the patient's trachea close to the bronchus, the connecting ring 104 is screwed into the fixing seat 101, and the outer liner tube 102 and the inner liner tube 103 are inflated through the inflation mechanism 2, and the fixing seat 101 and the inner liner tube 103 are sealed through the sealing ring 105, so that the outer liner tube 102 expands, so that the outer wall of the outer liner tube 102 fits with the inner wall of the patient's trachea, so as to better seal the patient's trachea, thereby fixing the protection mechanism 1 in the patient's body, so that the protection mechanism 1 forms a protection channel, and after the protection mechanism 1 is fixed, the catheter mechanism The structure 3 continues to move forward inside the protection mechanism 1, and the inner catheter 301 is extended into the bronchus on one side of the patient, and then the connecting ring 308 is screwed into the upper end of the inner liner tube 103, so as to fix the catheter mechanism 3 to the protection mechanism 1, and then the balloon 1 306 and the balloon 2 307 are inflated through the two inflation mechanisms 2, and the lower end of the outer tube 303 is fixed to the tail end of the patient's trachea through the balloon 1 306, and the patient's trachea is sealed, and then the bronchus on this side of the patient is blocked through the balloon 2 307, and finally the connecting seat 302 is connected to the ventilator, so as to complete single-lung ventilation. When there is secretion in the patient's body, When the suction tube 305 is connected to the suction device, the suction device sucks the secretions through the outer tube 303, and when air is injected into the outer liner 102, balloon 1 306 and balloon 2 307 through the syringe, the indicator balloon 203 will expand together with them, thereby causing the color of the mechanochromic material layer to change, so that medical staff can observe the situation of the indicator balloon 203 more intuitively, thereby judging the gas pressure inside the outer liner 102, balloon 1 306 and balloon 2 307, and preventing excessive gas from being filled in, which will cause the outer liner 102, balloon 1 306 and balloon 2 307 to rupture.

The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions only describe the principles of the present invention. The present invention may be subject to various changes and improvements without departing from the spirit and scope of the present invention. These changes and improvements fall within the scope of the present invention. The scope of protection claimed by the present invention is defined by the attached claims and their equivalents.

Claims (8)

1. A single-lung ventilation device, comprising a protection mechanism (1) and three inflation mechanisms (2), characterized in that: a catheter mechanism (3) is arranged inside the protection mechanism (1), and the three inflation mechanisms (2) are respectively connected to the protection mechanism (1) and the catheter mechanism (3); The protection mechanism (1) comprises a fixing seat (101), an outer liner (102), an inner liner (103) and a second connecting ring (104); the fixing seat (101) is fixed to the patient's upper lip via a tracheal tube holder; one end of the outer liner (102) is fixedly connected to the lower side of the fixing seat (101); the other end of the outer liner (102) is fixedly connected to the middle and lower side of the inner liner (103); the middle part of the second connecting ring (104) is arranged on the outer periphery of the upper end of the inner liner (103); and the outer side of the lower part of the second connecting ring (104) is connected to the inner side of the upper part of the fixing seat (101). 2. A single-lung ventilation device according to claim 1, characterized in that: one of the inflation mechanisms (2) is installed in the upper middle part of the fixing seat (101), and a sealing ring (105) is provided on the inner side wall of the upper middle part of the fixing seat (101), and the inner side of the sealing ring (105) is fitted to the outer periphery of the inner liner tube (103). 3. A single-lung ventilation device according to claim 1, characterized in that an air ring (106) is arranged at the lower end of the inner liner tube (103), and the outer periphery of the air ring (106) is arranged inside the outer liner tube (102). 4. A single-lung ventilation device according to claim 1, characterized in that: the end of the outer liner tube (102) away from the fixing seat (101) is arranged on the lower side of the inner liner tube (103). 5. A single-lung ventilation device according to claim 1, characterized in that: the catheter mechanism (3) comprises an inner catheter (301), a connecting seat (302), an outer sleeve (303), a connecting box (304), a sputum suction tube (305), balloon one (306), balloon two (307) and a connecting ring three (308), the upper end of the connecting seat (302) is connected to the ventilator, the lower end of the connecting seat (302) is fixedly connected to the upper end of the inner catheter (301), the upper part of the inner catheter (301) is arranged in the middle of the outer sleeve (303) through a bracket, the outer periphery of the outer sleeve (303) is arranged inside the inner liner (103), one end of the sputum suction tube (305) is connected to the suction device, and the sputum suction tube ( The other end of the connecting box (305) is connected to the connecting box (304), the middle part of the connecting box (304) is arranged on the outer periphery of the inner catheter (301), the lower end of the connecting box (304) is arranged on the upper end of the outer sleeve (303), the middle part of the connecting ring three (308) is arranged on the middle and upper part of the outer sleeve (303), the outer periphery of the lower part of the connecting ring three (308) is threadedly connected to the inner part of the upper end of the inner liner tube (103), the middle part of the balloon two (307) is fixedly connected to the outer periphery of the lower end of the inner catheter (301), the lower end of the balloon one (306) is fixedly connected to the outer periphery of the lower end of the outer sleeve (303), and the other two inflation mechanisms (2) pass through the connecting box (304) and are respectively connected to the balloon one (306) and the balloon two (307). 6. A single-lung ventilation device according to claim 5, characterized in that the outer wall of the inner catheter (301) and the inner wall of the outer tube (303) are both provided with a plurality of backflow prevention rings (309). 7. A single-lung ventilation device according to claim 1, characterized in that: the inflation mechanism (2) comprises an inflation tube (201), a needle plug (202) and an indicator balloon (203), the upper end of the inflation tube (201) is fixedly connected to the lower part of the needle plug (202), the needle plug (202) is connected to a syringe, the other end of the inflation tube (201) passes through the indicator balloon (203), and the inflation tube (201) and the indicator balloon (203) are connected to each other. 8. The single-lung ventilation device according to claim 7, characterized in that a layer of electrochromic material is provided on the periphery of the indicator balloon (203).