Lavage device

Abstract

The lavage device comprises a catheter and a sealing structure, the catheter is used for penetrating through a working channel of the bronchoscope, the working channel comprises a first port located in vitro, a second port stretching into the body and a third port communicated with the first port and the second port, the first end of the catheter stretches into the working channel from the first port and stretches out from the second port, and the second end of the catheter stretches out from the third port. The second end and the third port of the catheter are used for being connected with a negative pressure structure, the second end is further used for being connected with a liquid injection structure, and the sealing structure is arranged between the catheter and the first port to seal the first port. The bronchial tube can enter a secondary bronchial tube, the accuracy of lavage and recovery of a focus section of the bronchial tube is improved, the sealing structure is arranged between the first port and the catheter and can seal the first port, so that negative pressure is pumped from the third port so as to suck lavage liquid overflowing from the bronchial tube to the second port, lavage and liquid pumping can be carried out at the same time, and the lavage efficiency is improved. And the irrigation solution is effectively prevented from overflowing.

Description

Technical Field

[0001] The present invention relates to the technical field of medical devices, and in particular to an irrigation device. Background Art

[0002] With the pollution of the environment, lung diseases are gradually increasing, resulting in more people needing to undergo various lung examinations, including bronchoalveolar lavage examinations.

[0003] Bronchoalveolar lavage is a non-invasive operation technique performed through bronchoscopy and has been widely recognized in lung diagnosis. It mainly uses bronchoscopy to inject a sufficient amount of lavage fluid such as normal saline into the lung segment or sub-lung segment below the bronchus, and then recovers it through bronchoscopic suction. By testing the recovered lavage fluid, some important information can be obtained at the alveolar level, such as immune cells, inflammatory cells, cytology and infectious microbial pathogen data, etc., to assist in the diagnosis, condition observation and prevention judgment of respiratory diseases, which is of great clinical significance.

[0004] In this examination, because the lavage fluid such as saline is injected and recovered through the bronchoscope through the same pipeline, the recovery of the lavage fluid can only be started after the injection is completed. However, during this conversion process of injection and recovery, the lavage fluid will overflow and flow to other bronchial branches. The recovered lavage fluid is at risk of being contaminated by other bronchi, affecting the pathological examination results. At the same time, due to the limited size of the bronchoscope, it cannot be extended into more secondary bronchi for lavage and recovery, resulting in the inability to accurately lavage and recover the lesion segment, and the lavage fluid will be retained in the bronchi, causing hypoxemia, fever, etc., increasing the patient's pain. Summary of the Invention

[0005] In order to overcome the above technical problems, the present invention provides an lavage device that can extend into a more secondary bronchus and can prevent the lavage fluid from overflowing and flowing into other bronchi.

[0006] A technical solution adopted by the present invention is: an irrigation device, including a catheter and a sealing structure, the catheter is used to pass through the working channel of a bronchoscope, the working channel includes a first port outside the body, a second port extending into the body, and a third port connected to the first port and the second port, the first end of the catheter is used to extend into the working channel from the first port and extend from the second port, the second end of the catheter and the third port are used to be connected to a negative pressure structure, the second end is also used to be connected to an injection structure, and the sealing structure is adapted to be arranged between the catheter and the first port to seal the first port.

[0007] Preferably, the sealing structure is a sealing tube, the catheter passes through the sealing tube, the sealing tube includes a distal end outside the working channel and a proximal end adapted to be accommodated in the working channel, the diameter of the proximal end is smaller than the diameter of the working channel, and the diameter of the distal end is larger than the diameter of the working channel.

[0008] Preferably, the ratio a of the diameter of the end face of the distal end to the diameter of the working channel satisfies: 1.2≤a≤1.5; and / or, the ratio b of the outer diameter of the catheter to the inner diameter of the sealing tube satisfies: 1≤b≤1.1; and / or, the length L of the sealing tube satisfies: 5mm≤L≤25mm.

[0009] Preferably, the sealing structure is a sealing assembly, the sealing assembly is used to be detachably connected to the bronchoscope, the catheter passes through the sealing assembly and is adapted to extend into the first port, and the sealing assembly is sealed and connected to the catheter.

[0010] Preferably, the sealing assembly includes a sealing cover for the conduit to pass through, a first sealing ring and a base, so that the sealing cover is threadedly connected to the base, the first sealing ring is clamped between the sealing cover and the base, and the inner circumference of the first sealing ring abuts against the outer circumference of the conduit.

[0011] Preferably, a protrusion is provided on the outside of the first port, and the sealing assembly further comprises a second sealing ring clamped between the protrusion and the base, and the conduit passes through the second sealing ring and the protrusion.

[0012] Preferably, the sealing assembly further comprises a positioning frame fixedly connected to the base, and a snap plate slidably connected to the positioning frame, and the protrusion is located between the second sealing ring and the snap plate to achieve snap fixation of the protrusion and the sealing assembly.

[0013] Preferably, the snap plate includes a snap hole extending along the sliding direction of the snap plate, a connecting column is fixed between the protrusion and the bronchoscope, the connecting column passes through the snap hole, and the width of the snap hole is smaller than the width of the protrusion.

[0014] Preferably, the snap plate also includes a through hole provided at one end of the snap hole in the sliding direction and through which the protrusion can pass. The through hole is connected to the snap hole. When the snap plate moves to a predetermined position along the sliding direction, the through hole faces the protrusion so that the protrusion passes through the through hole.

[0015] Preferably, the positioning frame includes a base plate and a positioning rod fixed to the base plate, the snap plate is located between the base plate and the base, the snap plate is provided with a track hole extending along the sliding direction, and the positioning rod passes through the track hole.

[0016] Beneficial effects of the present invention: The present invention can enter a more secondary bronchus after the catheter passes through the bronchoscope and extends from the second port, thereby improving the accuracy of lavage and recovery of the bronchial lesion segment, and a sealing structure is arranged between the first port and the catheter to seal the first port, so that negative pressure is applied to the third port to suck the lavage fluid overflowing from the bronchus to the second port, thereby achieving lavage and fluid extraction at the same time, effectively preventing the lavage fluid from overflowing and being contaminated, and improving the accuracy of diagnosis. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a structural diagram of a first embodiment of an lavage device and a bronchoscope provided by the present invention;

[0018] Figure 2 is a structural diagram of a second embodiment of the lavage device and bronchoscope provided by the present invention;

[0019] Figure 3 yes Figure 1 A cross-sectional view of portion A of the irrigation device shown;

[0020] Figure 4 yes Figure 3 A cross-sectional view of the first port of the bronchoscope is shown;

[0021] Figure 5 yes Figure 3 A cross-sectional view of a first end of a catheter of an irrigation device is shown;

[0022] Figure 6 yes Figure 1 A cross-sectional view of a first embodiment of a sealing structure of an irrigation device is shown;

[0023] Figure 7 yes Figure 3 A cross-sectional view of the sealing structure, the conduit and the first port shown;

[0024] Figure 8 yes Figure 1 A cross-sectional view of a second embodiment of the sealing structure of the irrigation device shown;

[0025] Figure 9 yes Figure 8 An exploded view of the sealing structure shown;

[0026] Figure 10 yes Figure 8 A cross-sectional view of the sealing structure shown;

[0027] Figure 11 yes Figure 9 An exploded view of the connecting column, protrusion, positioning frame and snap plate shown;

[0028] Figure 12 yes Figure 11 A top view of the snap plate shown;

[0029] Figure 13 yes Figure 10 A cross-sectional view of the substrate shown;

[0030] Figure 14 yes Figure 10 A cross-sectional view of the sealing cover is shown.

[0031] Explanation of the reference numerals: 1-catheter; 11-first end; 111-first opening; 112-first through hole; 13-support rod; 12-second end; 2-sealing tube; 21-proximal end; 22-distal end; 3-sealing assembly; 31-positioning frame; 311-base plate; 312-positioning rod; 3111-second through hole; 32-snapping plate; 321-snapping hole; 322-through hole; 323-track hole; 33-base; 331-first groove; 332-second groove; 333-third through hole; 334-first thread; 335-plane; 34-sealing cover; 341-fourth through hole; 342-third groove; 343-protrusion; 344-second thread; 35-second sealing ring ;36-first sealing ring;37-screw;4-first three-way pipe;41-liquid extraction port;42-connecting port;43-liquid injection port;44-first switch;5-first suction structure;51-first container;52-first suction tube;53-first negative pressure tube;54-first negative pressure source;6-second suction structure;61-second container;62-second suction tube;63-second negative pressure tube;64-second negative pressure source;7-bronchoscope;71-first channel;72-second channel;73, connecting column;74-bump;8-second three-way pipe;81-first connecting port;82-second connecting port;84-third connecting port;84-second switch;9, third negative pressure source;91-third negative pressure tube. DETAILED DESCRIPTION

[0032] The following is a clear and complete description of the implantable medical device provided by the present invention in conjunction with the accompanying drawings. It can be understood that the described embodiments are only some embodiments of the present invention, not all embodiments, and the present invention can be implemented in many other ways different from those described herein.

[0033] Unless otherwise defined, all technical and scientific terms used in this specification have the same meanings as those commonly understood by those skilled in the art to which the present invention pertains. The terms used in this specification are only for describing specific embodiments and are not intended to limit the present invention.

[0034] It should be noted that all directional indications in the embodiments of this specification are only used to explain the relative position relationship, movement status, etc. between various components in a certain specific posture. If the specific posture changes, the directional indication will also change accordingly.

[0035] In addition, the terms "first," "second," and so on, used in this disclosure are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Therefore, features specified as "first" or "second" may explicitly or implicitly include at least one such feature. Throughout this specification, "plurality" means at least two, such as two or three, unless otherwise specifically defined.

[0036] The technical solutions of the various embodiments of the present invention may be combined with each other, but this must be based on the fact that they can be implemented by ordinary technicians in this field. When the combination of technical solutions is mutually contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0037] In this specification, axial refers to the direction parallel to the line connecting the distal center and the proximal center of the component; radial refers to the direction perpendicular to the above axial direction; circumferential refers to the intersection line of a plane perpendicular to the axial direction and the outer surface of the instrument.

[0038] In one embodiment, if Figure 1 and Figure 3 As shown, the irrigation device provided by the present invention includes a catheter 1, which is used to pass through the working channel of a bronchoscope 7. The working channel includes a first port 711 outside the body, a second port 712 extending into the body, and a third port 713 connected to the first port 711 and the second port 712. The first end 11 of the catheter 1 extends from the first port 711 into the working channel and extends from the second port 712.

[0039] Preferably, if Figure 3 As shown, the working channel includes a first channel 71 connecting the first port 711 and the second port 712, and a second channel 72 connecting the third port 713 and the first channel 71. The first port 711, the second port 712 and the third port 713 are interconnected through the first channel 71 and the second channel 72, which facilitates the injection and extraction of liquid and completes the functions of irrigation and recovery.

[0040] More preferably, if Figures 3 to 5As shown, the first end 11 of the catheter 1 extends from the first port 711 into the first channel 71 and extends from the second port 712. Since the outer diameter D2 of the catheter 1 is smaller than the outer diameter of the second port 712, the first end 11 of the catheter 1 can extend into a more secondary bronchus than the second port 712, and then liquid is injected or withdrawn through the catheter 1 to complete the lavage of the more secondary bronchus, thereby improving the accuracy of bronchial lavage and recovery.

[0041] More preferably, if Figure 5 As shown, the end face of the first end 11 is provided with a first opening 111 for outputting irrigation fluid to complete irrigation. Furthermore, a plurality of first through holes 112 are provided on the circumferential surface of the first end 11. The shapes of the first through holes 112 include but are not limited to circular, elliptical, diamond-shaped, etc. The number of first through holes 112 can be one or multiple. Preferably, the plurality of first through holes 112 are evenly distributed in the circumferential direction of the first end 11 and are spirally distributed in the axial direction. The setting of the first through holes 112 allows the irrigation fluid in the catheter 1 to be sprayed out from the first through holes 112 to the outside, thereby improving the efficiency of irrigation.

[0042] More preferably, Figure 5 As shown, in order to strengthen the support for the first through hole 112, the catheter 1 also includes a support rod 13 disposed in the first through hole 112. The two ends of the support rod 13 are fixedly connected to the inner surface of the first through hole 112. The support rod 13 can be fixedly connected by bonding, embedding, or other fixed connection methods, which are not specifically limited here. The support rod 13 preferably extends along the axial direction of the catheter 1 to provide axial support for the first through hole 112, preventing the first end 11 of the catheter 1 from bending at the first through hole 112 when encountering resistance during advancement into the bronchus, thereby preventing the first end 11 from being advanced into the target bronchus. The support rod 13 is preferably made of a metal material such as nickel-titanium alloy, cobalt-chromium alloy, etc., and the diameter of the support rod 13 is between 0.03 mm and 0.15 mm, thereby achieving a stable support effect for the first through hole 112.

[0043] In one embodiment, if Figure 1 As shown, the second end 12 of the catheter 1 and the third port 713 are used to connect to the negative pressure structure, and the second end 12 is also used to connect to the liquid injection structure (not shown).

[0044] Preferably, if Figure 1 As shown, the second end 12 is the end of the catheter 1 outside the body, and the third port 713 is also outside the body, so as to facilitate connection with the negative pressure structure to achieve suction inside the negative pressure structure.

[0045] More preferably, the negative pressure structure is mainly used to suction the catheter 1 and the third port 713 to facilitate the recovery of the irrigation fluid. The negative pressure structure includes multiple embodiments, two of which are listed below, but are not limited to these two embodiments:

[0046] The first implementation method: Figure 1 As shown, the negative pressure structure includes a first suction structure 5 and a second suction structure 6. The first suction structure 5 includes a first container 51, a first suction tube 52 connected to the first container 51, and a first negative pressure tube 53. The first container 51 is used to collect and recover irrigating fluids such as physiological saline. The first container 51 can be a conventional liquid collection box, etc., which belongs to the existing technology and will not be described in detail here. One end of the first suction tube 52 is sealedly connected to the first container 51 so that the interior of the first suction tube 52 is connected to the first container 51. The other end of the first suction tube 52 is connected to the second end 12 of the catheter 1, thereby achieving suction and recovery of irrigating fluid from the catheter 1. One end of the first negative pressure tube 53 is connected to the interior of the first container 51, and the other end of the first negative pressure tube 53 is connected to the first negative pressure source 54, thereby achieving negative pressure in the first container 51, and then achieving suction of the catheter 1 through the first suction tube 52.

[0047] Furthermore, the second suction structure 6 includes a second container 61, a second suction tube 62, and a second negative pressure tube 63. The second container 61 is used to recover overflowed irrigating fluid such as physiological saline. It is a conventional liquid collection box and belongs to the existing technology, which will not be described here. One end of the second suction tube 62 is connected to the second container 61 and is sealed, so that the sucked irrigating fluid can be concentrated in the second container 61. The other end of the second suction tube 62 is connected to the third port 713 to suction the third port 713 and then extract the liquid overflowing in the bronchus. One end of the second negative pressure tube 63 is connected to the second container 61 and is sealed, so as to facilitate the negative pressure of the second container 61. The other end of the second negative pressure tube 63 is connected to the second negative pressure source 64 to achieve negative pressure on the second negative pressure tube 63.

[0048] The second implementation method: Figure 2 As shown, in this embodiment, it is mostly the same as the first embodiment, with the difference that: the negative pressure structure does not have the first negative pressure source 54 and the second negative pressure source 64, and the negative pressure structure also includes a second three-way pipe 8 and a third negative pressure source 9 connected to the second three-way pipe 8.

[0049] Furthermore, the second three-way pipe 8 includes a first connection port 81, a second connection port 82, a third connection port 83 and a second switch 84. The first negative pressure tube 53 is connected to the third connection port 83, and the second negative pressure tube 63 is connected to the second connection port 82. The third negative pressure source 9 also includes a third negative pressure tube 91. One end of the third negative pressure tube 91 is connected to the third negative pressure source 9 so that the third negative pressure tube 91 can be pumped into the negative pressure tube through the third negative pressure source 9. At the same time, the other end of the third negative pressure tube 91 is connected to the first connection port 81. The second switch 84 is used to control the mutual connectivity of the first connection port 81, the second connection port 82 and the third connection port 83, thereby realizing the pumping of negative pressure into the first negative pressure tube 53, or the pumping of negative pressure into the second negative pressure tube 63, or the pumping of negative pressure into the first negative pressure tube 53 and the second negative pressure tube 63 at the same time. It belongs to the prior art and will not be repeated here.

[0050] More preferably, the injection structure can be a structure for injecting liquid, such as a syringe, and the injection structure is connected to the second end 12, so as to facilitate the injection of irrigation fluid such as physiological saline into the catheter 1 to achieve the irrigation function.

[0051] In order to simultaneously connect the second end 12 to the negative pressure structure and the injection structure, the second end 12 is provided with a first three-way pipe 4, which includes a liquid extraction port 41, a connecting port 42, a liquid injection port 43, and a first switch 44. The liquid extraction port 41 is connected to the first suction tube 52, the connecting port 42 is connected to the second end 12, and the liquid injection port 43 is connected to the liquid injection structure. The first switch 44 is used to control the connection between the liquid extraction port 41 and the connecting port 42, or the connection between the liquid injection port 43 and the connecting port 42, thereby achieving liquid injection and irrigation fluid recovery of the catheter 1. The structures of the first three-way pipe 4 and the second three-way pipe 8 are the same as those of three-way pipes on the market, which are related to the existing technology and will not be repeated here.

[0052] In one embodiment, the irrigation device further includes a sealing structure, which is disposed between the catheter 1 and the first port 711 to seal the first port 711 .

[0053] Preferably, the catheter 1 extends into the first channel 71 through the first port 711, and there is a gap between the outer surface of the catheter 1 and the inner surface of the first channel 71. Therefore, a sealing structure is provided between the catheter 1 and the first port 711 to seal the first port 711, and then negative pressure is applied to the third port 713 through the second suction structure 6 so that the lavage fluid overflowing from the bronchus to the second port 712 is sucked into the gap between the outer surface of the catheter 1 and the inner surface of the first channel 71, and then flows into the second channel 72, and finally enters the second container 61 through the third port 713 and the second suction tube 62, thereby achieving the effect of injecting and recovering the lavage fluid at the same time, and effectively preventing the lavage fluid in the bronchus from overflowing.

[0054] The sealing structure includes multiple implementations. The following lists two implementations of the sealing structure, but are not limited to these two implementations. Specifically:

[0055] The first implementation method: Figures 3 to 7 As shown, the sealing structure is a sealing tube 2, and the catheter 1 passes through the sealing tube 2. The sealing tube 2 includes a distal end 22 outside the working channel and a proximal end 21 accommodated in the working channel. The diameter of the proximal end 21 is smaller than the diameter D1 of the working channel, and the diameter of the distal end 22 is larger than the diameter D1 of the working channel.

[0056] Preferably, the sealing tube 2 is a circular sleeve structure, so as to facilitate the passage of the catheter 1 and achieve sealing between the catheter 1 and the first port 711. Furthermore, the sealing tube 2 is made of a soft polymer material, such as PTFE (polytetrafluoroethylene), rubber or other sealing materials.

[0057] More preferably, the sealing tube 2 is a tapered structure, that is, the diameter of the distal end 22 of the sealing tube 2 is larger than the diameter of the proximal end 21 , thereby facilitating blocking the gap between the first port 711 and the catheter 1 and sealing the first port 711 .

[0058] More preferably, the diameter of the distal end 22 is larger than the diameter D1 of the working channel and the diameter of the proximal end 21 is smaller than the diameter D1 of the working channel, so that after the first end 11 of the catheter 1 is inserted into the target position of the bronchus, the sealing tube 2 is moved so that the proximal end 21 is inserted from the first port 711 into the working channel, playing a guiding role, and finally the proximal end 21 is in the working channel and the distal end 22 is outside the working channel, and at the same time the sealing tube 2 abuts against the first port 711, so that the sealing tube 2 and the working channel have an interference fit, and because the sealing tube 2 is squeezed by the working channel, the sealing tube 2 is deformed and abuts against the outer surface of the catheter 1, thereby achieving effective sealing and fixation of the first port 711 and the catheter 1, and preventing the catheter from being displaced by gravity or accidental pulling during the operation.

[0059] In some preferred embodiments, a ratio a between a diameter D3 of the end surface 221 of the distal end 22 and a diameter D1 of the working channel satisfies: 1.2≤a≤1.5.

[0060] Preferably, the ratio a is any value between 1.2 and 1.5, and the user can select and set it as needed, and is not specifically limited here;

[0061] More preferably, by limiting the ratio a to the above range, on the one hand, it can prevent the ratio a from being too small, resulting in the diameter of the distal end being too small and extending into the working channel due to deformation, affecting the fixation of the catheter 1 and the sealing effect on the first port 711; on the other hand, it can prevent the ratio a from being too large, resulting in an increase in cost, etc.

[0062] In some preferred embodiments, Figure 5 and Figure 6 As shown, the ratio b of the outer diameter D2 of the conduit 1 to the inner diameter D4 of the sealing tube 2 satisfies: 1≤b≤1.1.

[0063] Preferably, the ratio b is any value between 1 and 1.1, and the user can select and set it as needed, and is not specifically limited here.

[0064] More preferably, by limiting the ratio b to the above range, the sealing tube 2 and the catheter 1 have a smaller interference fit, so that the sealing tube 2 can slide on the catheter 1 without falling off by itself, thereby ensuring the sealing effect between the sealing tube 2 and the catheter 1.

[0065] In some preferred embodiments, the length L of the sealing tube 2 satisfies: 5 mm ≤ L ≤ 25 mm.

[0066] Preferably, the length L of the sealing tube 2 can be any value between 5 mm and 25 mm, so that a part of it can be accommodated in the working channel and the other end is outside the first port 711, which not only ensures the sealing effect, but also realizes the relative fixation of the catheter 1, the sealing tube 2 and the first port 711.

[0067] The second implementation method: Figures 8 to 14 As shown, the sealing structure is a sealing component 3, which is detachably connected to the bronchoscope 7, and the catheter 1 passes through the sealing component 3 and extends into the first port 711, and the sealing component 3 is sealed and connected to the catheter 1.

[0068] Preferably, the sealing assembly 3 is arranged at the outer end of the first port 711 and is detachably connected to the bronchoscope 7, thereby facilitating the disassembly of the sealing assembly 3. The detachable connection here can be a snap connection or other connection method, which is not specifically limited here.

[0069] More preferably, the catheter 1 passes through the sealing assembly 3 and extends into the first port 711, and is sealed with the sealing assembly 3 at the same time, thereby achieving a seal between the catheter 1 and the first port 711, and then by suctioning the third port 713, the lavage fluid overflowing from the bronchus to the second port 712 is sucked into the gap between the outer surface of the catheter 1 and the inner surface of the first channel 71, and then enters the second container 61 through the second channel 72, the third port 713 and the second suction tube 62, thereby achieving lavage and recovery of the lavage fluid.

[0070] In some preferred embodiments, the sealing assembly 3 includes a sealing cover 34, a first sealing ring 36 and a base 33 through which the catheter 1 passes. The sealing cover 34 is threadedly connected to the base 33, and the first sealing ring 36 is clamped between the sealing cover 34 and the base 33. The inner circumferential surface of the first sealing ring 36 abuts against the outer circumferential surface of the catheter 1.

[0071] Preferably, if Figure 9 and Figure 13 As shown, the base 33 is arranged outside the first port 711 and facing the first port 711. The base 33 includes a first groove 331 away from the first port 711, a second groove 332 facing the first port 711, a third through hole 333 connecting the first groove 331 and the second groove 332, a first thread 334 arranged at one end of the base 33 away from the first port 711, and a plane 335 arranged on the side of the base 33.

[0072] The first groove 331 is arranged on the surface of the base 33 away from the first port 711. The first groove 331 is formed by being recessed inward from the surface of the base 33. The first groove 331 can be a cylinder or a rectangular parallelepiped or other geometric body, which is not specifically limited here; further, the second groove 332 is arranged on the surface of the base 33 facing the first port 711. The second groove 332 is formed by being recessed inward from the surface of the base 33. The second groove 332 can be a cylinder or a rectangular parallelepiped or other geometric body, which is not specifically limited here.

[0073] Furthermore, the third through hole 33 is located between the first groove 331 and the second groove 332. One end of the third through hole 33 is connected to the first groove 331, and the other end of the third through hole 333 is connected to the second groove 332. The inner diameter of the third through hole 333 is larger than the outer diameter D2 of the catheter 1 so that the catheter 1 can pass through.

[0074] Furthermore, the first thread 334 is arranged around the circumferential surface of the base 33 and is arranged at the end of the base 33 away from the first port 711. The arrangement of the first thread 334 is used to be fixedly connected with the sealing cover 34, which belongs to the existing technology and will not be repeated here.

[0075] Furthermore, the plane 335 is arranged on the side of the base 11 and at the end of the base 11 close to the first port 711. One or more planes 335 can be provided. In this embodiment, two planes 335 are provided and are located on opposite sides of the base 33.

[0076] More preferably, if Figure 9 and Figure 14As shown, the sealing cover 34 includes a fourth through hole 341, a third groove 342, a protrusion 343, and a second thread 344. The fourth through hole 341 passes through the upper and lower surfaces of the sealing cover 34. The fourth through hole 341 is opposite to the first groove 331 and is connected to the first groove 331. In one embodiment, the diameter of the fourth through hole 341 is larger than the outer diameter D2 of the catheter 1, and the central axis of the fourth through hole 341 and the third through hole 333 are collinear, so that the catheter 1 can pass through.

[0077] The third groove 342 is formed inwardly from the surface of the sealing cover 34 facing the base 33. The end of the base 33 facing away from the first port 711 is received in the third groove 342. Furthermore, the protrusion 343 is disposed in the third groove 342, and the fourth through hole 341 extends through the protrusion 343. When the upper end of the base 33 is received in the third groove 342, the protrusion 343 is received in the first groove 331.

[0078] The second thread 344 is arranged on the inner circumferential surface of the third groove 342. The second thread 344 is a prior art and will not be described in detail here. When the end of the base 33 is accommodated in the third groove 342, the second thread 344 cooperates with the first thread 334 to realize the threaded connection between the base 33 and the sealing cover 34.

[0079] Further preferably, the first sealing ring 36 is annular, the first sealing ring 36 is accommodated in the first groove 331, and the protrusion 343 abuts against the first sealing ring 36. When the sealing cover 34 is rotated and tightened on the base 33, the protrusion 343 squeezes the first sealing ring 36, so that the first sealing ring 36 extends and deforms toward the radial outside and the radial inside at the same time, and then the inner circumferential surface of the first sealing ring 36 abuts against the outer circumferential surface of the catheter 1, and the outer circumferential surface of the first sealing ring 36 abuts against the inner circumferential surface of the first groove 331, thereby realizing the sealing between the first sealing ring 36 and the catheter 1 and the base 33, thereby ensuring its sealing effect.

[0080] In some embodiments, a protrusion 74 is provided outside the first port 711 , and the sealing assembly 3 further includes a second sealing ring 35 clamped between the protrusion 74 and the base 33 , and the catheter 1 passes through the second sealing ring 35 and the protrusion 74 .

[0081] Preferably, the protrusion 74 is disposed outside the first port 711 and is fixedly connected to the bronchoscope 7 . The protrusion 74 may be cylindrical or rectangular, and is not specifically limited here.

[0082] More preferably, the second sealing ring 35 is annular so that the catheter 1 can pass through it. The second sealing ring 35 is arranged between the base 33 and the protrusion 74, and the second sealing ring 35 abuts on the surface of the protrusion 74 facing the base 33 and has an interference fit with it. Preferably, the interference is 0.3mm to 2mm, so that the surface of the protrusion 74 facing the second sealing ring 35 is in a sealed state; at the same time, the second sealing ring 35 is accommodated in the second groove 332 and abuts on the bottom surface of the second groove 332, thereby realizing sealing between the base 33 and the protrusion 74.

[0083] More preferably, since the protrusion 74 is arranged outside the first port 711, a channel 741 communicating with the first port 711 is provided inside the protrusion 74. Figure 11 As shown, the conduit 1 passes through the second sealing ring 35 and then extends into the channel 741 of the protrusion 74 and enters into the first port 711 .

[0084] In some embodiments, the sealing assembly 3 also includes a positioning frame 31 fixedly connected to the base 33 and a snap plate 32 slidably connected to the positioning frame 31. The protrusion 74 is located between the second sealing ring 35 and the snap plate 32 to achieve snap-fit fixation of the protrusion 74 and the sealing assembly 3.

[0085] Preferably, the positioning frame 31 is disposed between the base 33 and the first port 711 , and the positioning frame 31 is fixedly connected to the base 33 .

[0086] More preferably, the snap plate 32 is slidably connected to the positioning frame 31 so that the snap plate 32 can move along a sliding direction X, which is perpendicular to the axial direction of the base 33 and the catheter 1. Figure 11 and Figure 12 shown.

[0087] More preferably, the protrusion 74 is located between the second sealing ring 35 and the snap plate 32 , so that the protrusion 74 can be snap-fastened between the snap plate 32 and the second sealing ring 35 , so as to fix the sealing assembly 3 on the bronchoscope 7 .

[0088] In some embodiments, the snap plate 32 includes a snap hole 321 extending along the sliding direction of the snap plate, and a connecting column 73 is fixed between the protrusion 74 and the bronchoscope 7. The connecting column 73 passes through the snap hole 321, and the width d of the snap hole 321 is smaller than the width of the protrusion 74.

[0089] Preferably, the area of the protrusion 74 is larger than the area of the connecting column 73. In this embodiment, the protrusion 74 and the connecting column 73 are both cylinders, so the diameter of the protrusion 74 is larger than the diameter of the connecting column 73; further, the width d of the card hole 321 is larger than the diameter of the connecting column 73, so that the connecting column 73 can pass through the card hole 321.

[0090] More preferably, the snap plate 32 is in the shape of a flat plate, and is arranged perpendicular to the axis of the catheter 1 and the base 33 .

[0091] More preferably, the latch hole 321 is extended along the sliding direction X and is in a long strip shape. The latch hole 321 passes through the upper and lower surfaces of the snap plate 32 . Furthermore, the latch hole 321 is opposite to and connected to the second groove 332 .

[0092] Further preferably, the connecting column 73 is arranged between the protrusion 74 and the bronchoscope 7, one end of the connecting column 73 is fixedly connected to the protrusion 74, and the other end of the connecting column 73 is fixedly connected to the bronchoscope 7, thereby achieving the fixation of the protrusion 74 and the bronchoscope 7.

[0093] Furthermore, a channel (not shown) is provided in the connecting column 73, one end of the channel in the connecting column 73 is connected to the channel 741 in the protrusion 74, and the other end of the channel in the connecting column 73 is connected to the first port 711, so that the catheter 1 passes through the channel 741 in the protrusion 74 and then enters the channel in the connecting column 73, and finally passes through the first port 711 into the first channel 71.

[0094] Furthermore, the connecting column 73 passes through the card hole 321 so that the protrusion 74 can be snapped between the second sealing ring 35 and the snap plate 32. The width d of the card hole 321 is smaller than the width of the protrusion 74 to prevent the protrusion 74 from passing through the card hole 321 and detaching, thereby ensuring the fixing effect of the sealing assembly 3 and the protrusion 74.

[0095] In some embodiments, the snap plate 32 also includes a through hole 322 arranged at one end of the snap hole 321 in the sliding direction X and allowing the protrusion 74 to pass through. The through hole 322 is connected to the snap hole 321. When the snap plate 32 moves to a predetermined position along the sliding direction X, the through hole 322 faces the protrusion 74 so that the protrusion 74 passes through the through hole 322.

[0096] Preferably, if Figure 11 and Figure 12 As shown, the through hole 322 is provided at one end of the latch hole 321 in the sliding direction X. The through hole 322 is connected to the latch hole 321 , thereby facilitating the movement of the connecting post 73 from the latch hole 321 into the through hole 322 .

[0097] More preferably, the area of the through-hole 322 is larger than the area of the protrusion 74. In this embodiment, the diameter R of the through-hole 322 is larger than the diameter of the protrusion 74, so that when the connecting column 73 moves into the through-hole 322, the protrusion 74 can pass through the through-hole 322 to achieve the separation of the protrusion 74 from the sealing assembly 3, or the installation of the sealing assembly 3 on the protrusion 74.

[0098] More preferably, the predetermined position is a position where the connecting column 73 passes through the through-hole 322 and the protrusion 74 can pass through the through-hole 322 , so as to facilitate installation and removal of the sealing assembly 3 .

[0099] In some embodiments, the positioning frame 31 includes a base plate 311 and a positioning rod 312 fixed to the base plate 311. The snap plate 32 is located between the base plate 311 and the base 33. The snap plate 32 is provided with a track hole 323 extending along the sliding direction X, and the positioning rod 312 passes through the track hole 323.

[0100] Preferably, the base plate 311 is flat and has a second through hole 3111 defined therein. The diameter of the second through hole 3111 is larger than the diameters of the projection 74 and the connecting post 73, thereby facilitating the projection 74 and the connecting post 73 to pass through the second through hole 3111. The snap plate 32 is clamped between the base plate 311 and the base body 33, thereby limiting and fixing the snap plate 32 so that it can only slide between the base plate 311 and the base body 33.

[0101] More preferably, one or more positioning rods 312 can be provided. In the present embodiment, two positioning rods 312 are provided and are arranged opposite to each other. One end of the positioning rod 312 is fixedly connected to the base plate 311, and the other end is abutted on the plane 335 to be fixedly connected to the base 33. In the present embodiment, the positioning rod 312 is fixedly connected to the base 33 by a screw 37, which belongs to the prior art and will not be described in detail here. By abutting the positioning rod 312 on the plane 335, on the one hand, the fixing effect of the two can be ensured, and on the other hand, the positioning frame 31 can be prevented from rotating on the base 33, thereby ensuring the stability of the overall structure.

[0102] More preferably, there is one track hole 323, or multiple tracks can be provided. In this embodiment, there are two track holes 323 and they are arranged parallel to each other. The positioning rod 312 passes through the track hole 323 and is slidably connected thereto, so that the snap plate 32 can move along the sliding direction X under the limiting action of the positioning rod 312.

[0103] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A lavage device, characterized in that: The invention comprises a catheter (1) and a sealing structure, wherein the catheter (1) is used to pass through a working channel of a bronchoscope (7), the working channel comprising a first port (711) outside the body, a second port (712) extending into the body, and a third port (713) communicating with the first port (711) and the second port (712), the first end (11) of the catheter (1) is used to extend from the first port (711) into the working channel and extend from the second port (712), the second end (12) of the catheter (1) and the third port (713) are used to be connected to a negative pressure structure, the second end (12) is also used to be connected to an injection structure, and the sealing structure is adapted to be arranged between the catheter (1) and the first port (711) to seal the first port (711).

2. The irrigation device according to claim 1, characterized in that The sealing structure is a sealing tube (2), the catheter (1) passes through the sealing tube (2), and the sealing tube (2) includes a distal end (22) located outside the working channel and a proximal end (21) adapted to be accommodated in the working channel, the diameter of the proximal end (21) is smaller than the diameter of the working channel, and the diameter of the distal end (22) is larger than the diameter of the working channel.

3. The irrigation device according to claim 2, characterized in that The ratio a of the diameter (D3) of the end face of the distal end (22) to the diameter (D1) of the working channel satisfies: 1.2≤a≤1.5; and / or, the ratio b of the outer diameter (D2) of the catheter (1) to the inner diameter (D4) of the sealing tube (2) satisfies: 1≤b≤1.1; and / or, the length L of the sealing tube satisfies: 5mm≤L≤25mm.

4. The irrigation device according to claim 1, characterized in that The sealing structure is a sealing component (3), and the sealing component (3) is used to be detachably connected to the bronchoscope (7). The catheter (1) passes through the sealing component (3) and is adapted to extend into the first port (711). The sealing component (3) is sealed and connected to the catheter (1).

5. The irrigation device according to claim 4, characterized in that The sealing assembly (3) comprises a sealing cover (34) for the conduit (1) to pass through, a first sealing ring (36) and a base (33), wherein the sealing cover (34) is threadedly connected to the base (33), the first sealing ring (36) is clamped between the sealing cover (34) and the base (33), and the inner peripheral surface of the first sealing ring (36) abuts against the outer peripheral surface of the conduit (1).

6. The irrigation device according to claim 5, characterized in that A protrusion (74) is provided on the outside of the first port (711), and the sealing assembly (3) further comprises a second sealing ring (35) clamped between the protrusion (74) and the base (33), and the conduit (1) passes through the second sealing ring (35) and the protrusion (74).

7. The irrigation device according to claim 6, characterized in that The sealing assembly (3) further comprises a positioning frame (31) fixedly connected to the base (33), and a snap plate (32) slidably connected to the positioning frame (31); the protrusion (74) is located between the second sealing ring (35) and the snap plate (32) to achieve snap-fit fixation of the protrusion (74) and the sealing assembly (3).

8. The irrigation device according to claim 7, characterized in that The snap plate (32) includes a snap hole (321) extending along the sliding direction of the snap plate, a connecting column (73) is fixed between the protrusion (74) and the bronchoscope (7), the connecting column (73) passes through the snap hole (321), and the width of the snap hole (321) is smaller than the width of the protrusion (74).

9. The irrigation device according to claim 8, characterized in that The snap plate (32) further comprises a through hole (322) provided at one end of the snap hole (321) in the sliding direction (X) and capable of allowing the protrusion (74) to pass through. The through hole (322) is connected to the snap hole (321). When the snap plate (32) moves to a predetermined position along the sliding direction (X), the through hole (322) faces the protrusion (74) so that the protrusion (74) passes through the through hole (322).

10. The irrigation device according to claim 9, characterized in that The positioning frame (31) comprises a base plate (311) and a positioning rod (312) fixed to the base plate (311); the snap plate (32) is located between the base plate (311) and the base (33); the snap plate (32) is provided with a track hole (323) extending along a sliding direction (X); and the positioning rod (312) passes through the track hole (323).

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