Double-cavity suction catheter and alveolar lavage device

Abstract

The utility model discloses a double-cavity suction catheter and a pulmonary alveolar lavage device comprising the same. The catheter comprises a water injection pipe and a water suction pipe. A plurality of spray holes are formed in the circumferential surface of the water injection pipe, the far-end end surface of the water injection pipe is connected with the circumferential surface of the water suction pipe, the far-end end part of the water suction pipe is closer to the far-end side than the far-end end part of the water injection pipe, and the outer diameter of the far-end of the water suction pipe is smaller than that of the far-end of the water injection pipe. The lavage device can recover lavage fluid in the deeper airway and avoid retention of the lavage fluid in the body, and the lavage fluid in the trachea can be recovered through the water suction pipe while the lavage fluid is injected into the trachea through the water injection pipe for lavage.

Description

Technical Field

[0001] The utility model relates to the field of interventional medical equipment, in particular to a double-lumen suction catheter used for entering a patient's bronchus along an insertion tube of an existing endoscope for alveolar lavage and an alveolar lavage device comprising the double-lumen suction catheter. Background Art

[0002] Suction catheters are often used to insert into the lumen of the patient's body to sample secretions or other materials in the lumen and aspirate them to the outside of the body with the help of negative pressure equipment. For example, bronchoalveolar lavage is to inject a sufficient amount of normal saline into the bronchial or sub-segmental lungs horizontally through an endoscope and its insertion tube, and then fully aspirate and recover the lavage fluid, so as to sample secretions in the bronchus and test the samples. This can obtain important information such as immune cells, inflammatory cells, cytology and pathogenic data of infectious microorganisms at the alveolar level, assist in the diagnosis, condition observation and prognosis of respiratory diseases, and has great clinical significance.

[0003] In this procedure, injecting saline through a bronchoscope and recovering the lavage fluid are two processes that occur in the same flow channel. Only after injecting saline into the diseased bronchus can the operator activate negative pressure through the bronchoscope to recover the lavage fluid. During the conversion process of lavage and recovery, saline may flow to other bronchial branches, and there is a risk of contamination from other places, making it impossible to perform accurate pathological searches. In addition, due to the limited size of the bronchoscope, it cannot be extended into more secondary and thinner bronchi for lavage and suction, resulting in the inability to accurately lavage the diseased segment and a low lavage fluid recovery rate, which may cause lavage fluid to remain in the bronchi and cause hypoxemia, fever, etc. Utility Model Content

[0004] In view of the defects of the above-mentioned prior art, the purpose of the present invention is, on the one hand, to provide a double-lumen suction catheter which can improve the recovery rate of the detection liquid and can recover while irrigating.

[0005] A technical solution adopted to achieve the purpose of the utility model is: a double-lumen suction catheter, comprising a water injection pipe and a water suction pipe. The circumferential surface of the water injection pipe has a plurality of spray holes, the distal end surface of the water injection pipe is connected to the circumferential surface of the water suction pipe, the distal end of the water suction pipe is closer to the distal side than the distal end of the water injection pipe, and the distal outer diameter of the water suction pipe is smaller than the distal outer diameter of the water injection pipe.

[0006] The distal end of the water suction tube of the catheter is closer to the distal side relative to the water injection tube, and the outer diameter of the water suction tube is smaller than that of the water injection tube, so that the irrigation fluid in the deeper airway can be recovered, which can not only improve the recovery rate but also avoid the retention of irrigation fluid in the body; and because the water injection tube and the water suction tube are arranged separately, the irrigation fluid can be injected into the trachea through the water injection tube for irrigation, and the irrigation fluid in the trachea can be recovered through the water suction tube.

[0007] In the double-lumen suction catheter provided in an embodiment of the utility model, the connection line of the plurality of spray holes forms a spiral line along the axial direction, and the center distance between two adjacent spray holes is 1 mm to 5 mm.

[0008] In the double-lumen suction catheter provided in one embodiment of the utility model, the distance between the distal end surface of the water injection tube and the nearest spray hole is 2 mm to 5 mm, and the area of ​​each spray hole gradually decreases from the proximal end to the distal end.

[0009] In the double-lumen suction catheter provided in one embodiment of the utility model, the distal end surface of the water injection tube forms an angle of 30° to 60° with the central axis of the water suction tube, and the distal end surface is provided with a plurality of through holes.

[0010] In a double-lumen suction catheter provided in one embodiment of the utility model, the suction catheter includes a first water suction tube, a first water injection tube which is sleeved outside the first water suction tube and radially separated from the first water suction tube, a second water suction tube and a second water injection tube which is arranged outside the second water suction tube, the first water injection tube is communicated with the second water injection tube, the first water suction tube is communicated with the second water suction tube, the second water suction tube and the second water injection tube have a common tube wall along the axial direction, the distal end of the first water suction tube is closer to the distal side than the distal end of the first water injection tube, and the distal outer diameter of the first water suction tube is smaller than the distal outer diameter of the first water injection tube.

[0011] In the double-lumen suction catheter provided in one embodiment of the utility model, the second water injection pipe and the second water suction pipe are provided with a plurality of water suction holes on a common pipe wall, and the area of ​​the water suction holes is larger than the cross-sectional area of ​​the second water suction pipe.

[0012] In the double-lumen suction catheter provided in one embodiment of the utility model, a flexible head is provided at the distal end of the water suction tube.

[0013] In the double-lumen suction catheter provided in one embodiment of the utility model, the catheter also includes a connecting piece, which has an injection cavity communicated with the proximal end of the water injection tube, and a negative pressure cavity communicated with the proximal end of the water suction tube, and the cross-sectional area of ​​the negative pressure cavity is larger than the cross-sectional area of ​​the proximal end of the water suction tube.

[0014] In the double-lumen suction catheter provided in an embodiment of the utility model, the peripheral surface of the absorption tube has at least one water absorption hole, and the area of ​​the water absorption hole is larger than the cross-sectional area of ​​the water absorption tube.

[0015] In the double-lumen suction catheter provided in an embodiment of the present invention, the water suction hole is closer to the proximal side than the spray hole closest to the proximal side.

[0016] Another object of the present utility model is to provide an alveolar lavage device which can accurately perform alveolar lavage and is convenient for recovering the detection liquid.

[0017] The alveolar lavage device provided by a technical solution of the utility model includes the aforementioned double-chamber suction catheter, a control valve connected to the proximal end of the catheter, a suction tube connected to the control valve, a liquid collection bottle connected to the suction tube, and a negative pressure tube connected to the liquid collection bottle.

[0018] The distal end of the water suction pipe of the alveolar lavage device extends out of the water injection pipe, and the diameter of the water suction pipe is smaller than that of the water injection pipe, so that the lavage fluid in the deeper airway can be recovered, which can not only improve the recovery rate, but also avoid the retention of lavage fluid in the body. In addition, since the water injection pipe and the water suction pipe are provided separately, the lavage fluid can be injected into the trachea through the water injection pipe for lavage, and the lavage fluid in the trachea can be recovered through the water suction pipe. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0020] Figure 1 The schematic diagram of the structure of the alveolar lavage device provided by the first embodiment of the utility model is schematically shown, and the alveolar lavage device includes a double-lumen suction catheter;

[0021] Figure 2 Schematically shows Figure 1 A cross-sectional view of the main structure of the catheter shown;

[0022] Figure 3 Shows Figure 2 A schematic diagram showing an enlarged view of the distal end of the catheter;

[0023] Figure 4 Shows Figure 2 a schematic cross-sectional view of the catheter shown;

[0024] Figure 5 Schematically shows Figure 1The schematic diagram of the structure in which the distal end surface of the catheter is provided with a through hole;

[0025] Figure 6 The schematic diagram shows a structure of a double-lumen suction catheter provided in the second embodiment of the present utility model having a flexible head at the distal end;

[0026] Figure 7 The schematic diagram shows the structure of the distal end of the double-lumen suction catheter provided by the third embodiment of the utility model after being cut open along the axial direction;

[0027] Figure 8 Schematically shows Figure 7 a schematic cross-sectional view of the distal end of the catheter;

[0028] Fig. 9 Schematically shows Figure 7 Another schematic diagram of a cross-section of the distal end of the catheter;

[0029] Fig.10 Schematically shows Figure 7 A schematic diagram of a catheter having a flexible tip at the distal end thereof;

[0030] Fig.11 The schematic diagram of the structure of the double-lumen suction catheter provided by the fourth embodiment of the utility model after being cut open along the axial direction is shown;

[0031] Fig.12 Schematically shows Fig.11 a schematic cross-sectional view of the distal end of the catheter;

[0032] Fig.13 Schematically shows Fig.12 A schematic cross-sectional view of a first main body section of the double lumen aspiration catheter shown;

[0033] Fig.14 The schematic diagram shows a structure in which the distal end of the double-lumen suction catheter provided by the fourth embodiment of the utility model has a flexible head. DETAILED DESCRIPTION

[0034] The technical solutions of various embodiments of the utility model will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the utility model. Moreover, based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0035] It should be noted that all directional indications in the embodiments of the present invention are only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture. If the specific posture changes, the directional indication will also change accordingly.

[0036] In the description of the present invention, "plurality" means two or more, such as two, three, etc. Unless otherwise specified and limited, the terms "connection", "fixation", etc. should be understood in a broad sense. For example, "fixation" can be a fixed connection, a detachable connection, or an integral connection. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0037] In addition, the technical solutions between the various embodiments of the present invention can be combined with each other, but it must be based on the fact that ordinary technicians in the field can implement it. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0038] It should be noted that "distal end" and "proximal end" are commonly used terms in the field of medical devices, where "distal end" refers to the end away from the operator during surgery, and "proximal end" refers to the end close to the operator during surgery. Axial refers to the direction parallel to the line connecting the distal and proximal centers of the medical device; radial refers to the direction perpendicular to the above-mentioned axial direction.

[0039] See also Figure 1 The alveolar lavage device provided in the first embodiment of the utility model comprises a double-lumen suction catheter 110, a control valve 130 communicating with the proximal end of the catheter 110, a suction tube 142 communicating with the control valve 130, a liquid collection bottle 141 communicating with the suction tube 142, and a negative pressure tube 143 communicating with the liquid collection bottle 141. The alveolar lavage device is used in conjunction with a negative pressure source 300 and a syringe 600, and can suck and infuse the lavage stock solution (i.e., the detection solution) that has been injected into the trachea and contaminated by substances in the trachea while infusing new lavage stock solution into the trachea through the syringe 600.

[0040] The double-lumen suction catheter 110 includes a water injection tube 115, a water suction tube 116 and a connecting piece 117. Figures 1 to 4The water suction tube 116 is sleeved inside the water injection tube 115, and the two are radially spaced from each other. The distal end of the water suction tube 116 extends out of the water injection tube 115, that is, it is closer to the distal side relative to the distal end of the water injection tube 115. During the irrigation process, the irrigation fluid will flow toward the deeper airway under the action of injection pressure and gravity. Since the distal end of the water suction tube 116 extends out of the water injection tube 115, and the distal outer diameter of the water suction tube 116 is smaller than that of the water injection tube 115, the irrigation fluid can be recovered from the deeper airway, thereby improving the recovery rate and avoiding the risk of retaining the irrigation fluid in the body.

[0041] Please also see Figure 2 and Figure 3 The circumferential surface of the water injection pipe 115 is provided with two spray holes 1151. The shape of the spray holes 1151 is not limited to a circle, and can also be other common shapes such as an ellipse, a diamond, etc. There can be multiple spray holes 1151, preferably 3. The line connecting the multiple spray holes 1151 on the circumferential surface of the water injection pipe 115 forms a spiral line along the axial direction of the water injection pipe 115, and the center distance between two adjacent spray holes is 1mm to 5mm. By providing multiple spray holes 1151 on the circumferential surface of the water injection pipe 115, circumferential irrigation can be achieved, and irrigation at a more distal end can utilize the port spraying of the water injection pipe 115 and the gravity of the liquid to irrigate the more distal trachea, which is also beneficial for directly cleaning the lesion segment on the bronchial wall, improving the cleaning of the lesion and increasing the pathogen detection rate.

[0042] The distance between the distal end of the water injection pipe 115 and the nearest spray hole 1151 is 2 mm to 5 mm. The area of ​​the spray hole 1151 is between 0.38 mm 2 Up to 0.9mm 2 Along the water flow direction of the water injection pipe 115, that is, from the proximal end to the distal end, the area of ​​the spray hole 1151 gradually decreases, and the area ratio of two adjacent spray holes 1151 is preferably 1.1 to 1.4. This is set because the kinetic energy of the irrigation liquid in the water injection pipe 115 is gradually reduced due to friction and other reasons, that is, the closer to the distal end of the water injection pipe 115, the smaller the pressure. In order to make the spray hole 1151 at the more distal end have a spraying effect similar to that of the proximal spray hole, by reducing the area of ​​the more distal spray hole, the unit area of ​​the distal spray hole is subjected to a greater pressure, which is conducive to improving the spraying effect of the distal spray hole 1151.

[0043] The cross-sectional area of ​​the water suction pipe 116 is greater than the cross-sectional area of ​​the water injection pipe 115. As a preferred embodiment, the ratio of the cross-sectional area of ​​the water suction pipe 116 to the cross-sectional area of ​​the water injection pipe 115 is between 1 and 1.5. In the present invention, the cross-sectional area refers to the area of ​​the area enclosed by the outer surface of the pipe body when the pipe body is cut in a direction perpendicular to the axial direction minus the area of ​​the pipe wall. For example, in Figure 3 In the structure shown, the cross-sectional area of ​​the water injection pipe 115 is Figure 3The area of ​​the annular object outside the absorption tube 116 is shown minus the area of ​​the wall of the water injection tube 115. Pure liquid is injected through the water injection tube 115. As long as the lumen of the water injection tube 115 is unobstructed, the injected liquid can smoothly complete the irrigation. However, during the suction process, not only the irrigation liquid but also the mucus and sputum that may exist in the airway flow into the water suction tube 116. If thick mucus or sputum is encountered, if the water suction tube 116 is too thin, the distal port of the water suction tube 116 may be blocked by the thick mucus or sputum, resulting in recovery failure.

[0044] See also Figure 5 The distal end face of the water injection pipe 115 is a slope 1152 connected to the circumferential surface of the water suction pipe 116. The angle θ between the slope 1152 and the axis of the water injection pipe 115 is between 30° and 60°. The slope 1152 is provided with a plurality of through holes 1153. The central axis of the through hole 1153 is perpendicular to the slope 1152. The advantage of such a setting is that when the irrigation fluid passes through the slope 1152 of the water injection pipe 115, the sprayed irrigation fluid can clean the airway wall at a certain angle with the axial direction, thereby making the water injection pipe 115 have a more ideal spraying effect on the airway wall.

[0045] As a preferred embodiment, in order to allow the sucked material to pass through the water suction pipe 116 more smoothly, the inner wall of the water suction pipe 116 may be provided with a hydrophilic coating.

[0046] Please also read Figure 1 and Figure 2 , the connector 117 has an injection channel 1171, a negative pressure channel 1172, a negative pressure end 1173 and an injection end 1174. The distal end of the injection channel 1171 is communicated with the proximal end of the water injection tube 115, and the distal end of the negative pressure channel 1172 is communicated with the proximal end of the water suction tube 116. Thus, the syringe 600 can be inserted into the injection end 1173, and the irrigation liquid can be injected through the injection channel 1171 to complete the injection and irrigation. In addition, the negative pressure channel 1172 is connected to the liquid collection bottle 141, the negative pressure tube 143 and the negative pressure source 300 through the control valve 130 and the suction tube 142, and the irrigation liquid after irrigation can be sucked by adjusting the control valve 130 until it is recovered into the liquid collection bottle 141.

[0047] The cross-sectional area of ​​the negative pressure cavity 1172 is larger than the cross-sectional area of ​​the water suction pipe 116, so as to avoid the negative pressure cavity 1172 from being blocked during the suction process. If the cross-sectional area of ​​the negative pressure cavity 1172 is smaller than the cross-sectional area of ​​the water suction pipe 116, the cross-sectional area of ​​the material sucked into the water suction pipe 116 may be larger than the cross-sectional area of ​​the negative pressure cavity 1172, and thus be blocked in the negative pressure cavity 1172.

[0048] In the alveolar lavage device provided in this embodiment, since the water injection pipe 115 and the water suction pipe 116 are two independent pipes, the lavage stock solution and the suction detection solution can be respectively injected, that is, the lavage stock solution can be injected while the detection solution is sucked out. A plurality of spray holes 1151 connected to form a spiral line are arranged on the circumferential surface of the water injection pipe 115, which can realize circumferential lavage and have a better cleaning effect on the tracheal wall. At the same time, the water suction pipe 116 can extend into the deeper trachea for deep suction, which can not only prevent overflow, but also the collected detection solution covers a wide range of lesions, which can improve the pathogen detection rate.

[0049] The double-lumen suction catheter provided in the second embodiment of the present invention has a structure similar to that of the catheter 110 provided in the first embodiment, except that: Figure 6 The distal end of the suction tube 116 of the double-lumen suction catheter provided in this embodiment is provided with a flexible head 130, thereby avoiding damage to the bronchus when the distal end of the suction tube 116 is extended into the bronchus.

[0050] The double-lumen suction catheter provided in the third embodiment of the present invention has a structure similar to that of the catheter 110 provided in the first embodiment, except that the structures of the water suction pipe 116 and the water injection pipe 115 are different. Figure 4 The coaxial arrangement shown in FIG. 1 shows, the water suction pipe 116 is not arranged in the water injection pipe 115. For details, see Figure 7 and Figure 8 At least one water absorption hole 1161 is provided on the circumference of the water absorption tube 116, and the water absorption hole 1161 can be circular, elliptical, diamond-shaped, etc. Preferably, the water absorption hole 1161 is elliptical, and the major axis of the ellipse is parallel to the generatrix of the water absorption tube 116, so that the area of ​​the water absorption hole 1161 can be much larger than the cross-sectional area of ​​the water absorption tube 116, increasing the maximum area of ​​the water absorption hole 1161 in contact with the irrigation fluid, thereby improving the ability to suck the irrigation fluid.

[0051] The water suction hole 1161 is closer to the proximal side than the spray hole 1151 which is closest to the proximal side. With such a configuration, when the irrigation liquid is sprayed out from the spray hole 1151 and the irrigation amount is relatively large, the irrigation liquid may directly overflow from the spray hole 1151. At this time, because the water suction hole 1161 is at a more upstream position relative to the spray hole 1151, when the irrigation liquid overflows to the position of the water suction hole 1161, the irrigation liquid will be sucked into the water suction pipe 116 to avoid overflowing to other bronchial branches.

[0052] The cross-sections of the water suction pipe 116 and the water injection pipe 115 are semicircular with equal radius, and the two cooperate to form a circle. As a modified structure, the cross-sections of the water suction pipe 116 and the water injection pipe 115 are also as follows Fig. 9 In the structure shown, the cross section of the water suction pipe 116 is roughly circular, while the cross section of the water injection pipe 115 is crescent-shaped.

[0053] Similarly, in order to prevent the water suction tube 116 from damaging the tracheal wall when it is extended into the trachea, in this embodiment, the distal end of the water suction tube 116 may also have a flexible head 1162.

[0054] See also Figures 11 to 13 The double-lumen suction catheter provided in the fourth embodiment of the utility model includes a first main body section 118 and a second main body section 119. Accordingly, the water injection pipe is divided into a first water injection pipe 1181 and a second water injection pipe 1191, and the water suction pipe is divided into a first water suction pipe 1182 and a second water suction pipe 1192. The length of the first main body section is 5 mm to 20 mm. The cross section of the first main body section 118 is as follows: Fig.12 The annular double-cavity structure shown has an outer cavity which is the first water injection pipe 1181, and an inner cavity which is the first water suction pipe 1182, that is, the first water injection pipe 1181 and the first water suction pipe 1182 in the first main body section 118 are radially separated from each other, and the distal end of the first water suction pipe 1182 is closer to the distal side than the distal end of the first water injection pipe 1181, and the distal outer diameter of the first water suction pipe 1182 is smaller than the distal outer diameter of the first water injection pipe 1181.

[0055] The cross section of the second water injection pipe 1191 in the second main body section 119 is as follows: Fig.13 In the crescent-shaped embodiment shown, the cross section of the second water suction pipe 1192 is elliptical, so as to maximize the cross-sectional area of ​​the second water suction pipe 1192, thereby increasing the suction effect and avoiding clogging. The second water suction pipe 1192 and the second water injection pipe 1191 share part of the pipe wall along the axial direction. In other embodiments, the cross section of the water suction pipe 1192 in the second main body section 119 can be circular.

[0056] The first water injection pipe 1181 is connected to the second water injection pipe 1191. The circumferential surface of the first water injection pipe 1181 is provided with a plurality of spray holes 1183 in the circumferential direction, and the second water suction pipe 1193 and the second water injection pipe 1191 are provided with a plurality of water suction holes 1193 on the tube wall shared by the second water suction pipe 1193 and the second water injection pipe 1191. The advantage of such a configuration is that when the injected irrigation stock solution flows from the second main body section 119 through the first main body section 118, the water injection cavity is transformed from a crescent shape to a ring shape. The spray holes 1183 can spray in the entire circumferential direction. In the process of recovering the irrigation fluid, if the irrigation fluid spreads, the irrigation fluid will spread from the outside of the first main body section 118 to the direction of the second main body section 119. When it spreads to the water suction holes 1193 of the second main body section 119, the water suction holes 1193 of the second main body section 1151 can recover the spread irrigation fluid to avoid overflow.

[0057] Similarly, in order to prevent the first water suction pipe 1182 from damaging the tracheal wall when extending into the trachea, in this embodiment, the distal end of the first water suction pipe 1182 may also have a flexible head 1184.

[0058] The above is a relatively detailed description of the double-lumen suction catheter and alveolar lavage device provided by the utility model. It is understandable that the above description does not limit the patent scope of the utility model. All equivalent structural changes made by using the contents of the utility model specification and drawings under the utility model concept, or directly / indirectly used in other related technical fields are included in the patent protection scope of the utility model.

Claims

1. A double-lumen suction catheter, comprising a water injection tube and a water suction tube, characterized in that: The circumferential surface of the water injection pipe has a plurality of spray holes, the distal end surface of the water injection pipe is connected to the circumferential surface of the water suction pipe, the distal end of the water suction pipe is closer to the distal side than the distal end of the water injection pipe, and the distal outer diameter of the water suction pipe is smaller than the distal outer diameter of the water injection pipe.

2. The double-lumen aspiration catheter according to claim 1, characterized in that: The connection line of the plurality of spray holes forms a spiral line along the axial direction, and the center distance between two adjacent spray holes is 1 mm to 5 mm.

3. The double-lumen aspiration catheter according to claim 1, characterized in that: The distance between the distal end face of the water injection pipe and the nearest spray hole is 2 mm to 5 mm, and the area of ​​each spray hole gradually decreases from the proximal end to the distal end.

4. The double-lumen aspiration catheter according to claim 1, characterized in that: The distal end surface of the water injection pipe forms an angle of 30° to 60° with the central axis of the water suction pipe, and the distal end surface is provided with a plurality of through holes.

5. The double-lumen aspiration catheter according to claim 1, characterized in that: The suction duct includes a first water suction pipe, a first water injection pipe which is sleeved outside the first water suction pipe and radially separated from the first water suction pipe, a second water suction pipe and a second water injection pipe which is arranged outside the second water suction pipe, the first water injection pipe is communicated with the second water injection pipe, the first water suction pipe is communicated with the second water suction pipe, the second water suction pipe and the second water injection pipe have a common pipe wall along the axial direction, the distal end of the first water suction pipe is closer to the distal side than the distal end of the first water injection pipe, and the distal outer diameter of the first water suction pipe is smaller than the distal outer diameter of the first water injection pipe.

6. The double-lumen aspiration catheter according to claim 5, characterized in that: The second water injection pipe and the second water absorption pipe are provided with a plurality of water absorption holes on a common pipe wall, and the area of ​​the water absorption holes is larger than the cross-sectional area of ​​the second water absorption pipe.

7. The double-lumen aspiration catheter according to claim 1, characterized in that: The distal end of the water suction pipe is provided with a flexible head.

8. The double-lumen aspiration catheter according to claim 1, characterized in that: The catheter also includes a connector having an injection cavity communicating with the proximal end of the water injection pipe and a negative pressure cavity communicating with the proximal end of the water suction pipe, wherein the cross-sectional area of ​​the negative pressure cavity is greater than the cross-sectional area of ​​the proximal end of the water suction pipe.

9. The double-lumen aspiration catheter according to claim 1, characterized in that: The circumferential surface of the water suction pipe is provided with at least one water suction hole, and the area of ​​the water suction hole is larger than the cross-sectional area of ​​the water suction pipe.

10. The double-lumen aspiration catheter according to claim 6 or 9, characterized in that: The water suction hole is closer to the proximal end side than the spray hole closest to the proximal end side.

11. A pulmonary alveolar lavage device, characterized in that: It comprises a double-lumen suction catheter as described in any one of claims 1 to 9, a control valve connected to the proximal end of the catheter, a suction tube connected to the control valve, a liquid collection bottle connected to the suction tube, and a negative pressure tube connected to the liquid collection bottle.

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