Suction catheter and suction device

Abstract

The utility model discloses a suction catheter which is used for entering a bronchus along an insertion tube of an existing endoscope to carry out alveolar lavage. The suction catheter comprises a non-transparent flexible section located at the far end and a transparent section communicated with the near end of the flexible section. And the hardness of the transparent section is greater than that of the flexible section. The utility model further relates to a suction device comprising the suction catheter. The suction device comprises a three-way valve provided with an injection cavity, a suction catheter connecting cavity and a suction tube connecting cavity, the suction catheter connecting cavity is matched to be connected with the near end of the transparent section in an inserted mode, and the suction tube connecting cavity is matched to be connected with the suction tube in an inserted mode. The inner diameter of the suction catheter connecting cavity and the inner diameter of the suction tube connecting cavity are both larger than the diameter of a flow channel cavity of the suction catheter. According to the suction device, due to the fact that the suction catheter is provided with the transparent section, an operator can conveniently observe the situation of a flow channel in real time through an endoscope, and the suction catheter is prevented from being blocked.

Description

Technical Field

[0001] The utility model relates to the field of interventional medical equipment, in particular to a suction catheter used for entering a patient's bronchus along an insertion tube of an existing endoscope for alveolar lavage and a suction device comprising the 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, by injecting a sufficient amount of lavage fluid into the bronchial or sub-segmental lung level through an endoscope and its insertion tube, and then fully aspirating and recovering the lavage fluid, the secretions in the bronchus can be sampled and tested. This can obtain important information such as immune cells, inflammatory cells, cytology, and pathogenic information of infectious microorganisms at the alveolar level, which assists in the diagnosis, condition observation, and prognosis of respiratory diseases, and has great clinical significance.

[0003] In the traditional bronchoalveolar lavage surgery currently widely performed at home and abroad, the surgeon generally uses a hose to connect one end of the collector to the connector of the working channel of the endoscope, and connects the other end of the collector to the negative pressure device. The lavage fluid is directly injected into the target bronchus through the working channel hole of the endoscope, or the catheter is injected from the catheter after passing through the working channel of the endoscope to the target position. When the bronchoalveoli are filled with lavage fluid, press the negative pressure switch on the endoscope, and the liquid in the target bronchus can be sucked into the collector through the working channel hole at the distal end of the endoscope, thereby completing an lavage and suction.

[0004] The lavage surgery has the following defects: 1. The distal end of the endoscope or its matching insertion tube is limited by its size and cannot be extended into the more secondary or thinner bronchus for lavage and suction. The lavage fluid after lavage will flow into the more secondary bronchus, so the recovered lavage fluid may be contaminated by the secretions in the more secondary bronchus, or the secretions in the more secondary bronchus cannot be sampled. These reasons lead to the fact that the obtained samples cannot truly reflect the pathogens in the target bronchus and cannot be accurately found by pathology; 2. There is often mucus or other secretions in the patient's lesion bronchus. In the process of suctioning and recovering the lavage fluid, the suction catheter is likely to be blocked. The use of an endoscope cannot directly observe the flow of the suction catheter in time. As time goes by, the lavage fluid may expand from the lesion to other non-lesioned bronchi, increasing the risk of contamination of other healthy segments, and even causing the operator to mistakenly believe that the lavage fluid has been completely recovered, and too much lavage fluid is retained in the body. Utility Model Content

[0005] 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 suction catheter that can enter the secondary bronchus along the insertion tube of an endoscope to perform alveolar lavage and facilitate real-time observation of the flow channel conditions.

[0006] A technical solution adopted to achieve the purpose of the utility model is: a suction catheter, used to enter the bronchus along the insertion tube of an endoscope for alveolar lavage, including a flexible section located at the distal end and opaque and a transparent section connected to the proximal end of the flexible section, the hardness of the transparent section is greater than the hardness of the flexible section.

[0007] Since the suction catheter has a transparent section, it is convenient for doctors to observe the flow channel conditions in real time through an endoscope to avoid blockage of the suction catheter.

[0008] As an embodiment, the inner wall of the transparent section is provided with a hydrophilic coating, and the transparency of the transparent section can be 60%-95%, so that the hydrophilic coating can be photocured when the hydrophilic coating is made on the inner wall of the transparent section.

[0009] In one embodiment of the suction catheter provided by the utility model, the suction catheter further comprises a connecting section, the two ends of the connecting section are respectively fixed to and communicated with the flexible section and the transparent section, the connecting section and the transparent section are made of the same material but different colors, and the connecting section and the flexible section are made of different materials but the same color. Thus, the connecting section and the transparent section can be firmly combined by hot-melting in a docking manner, without the need for overlapping hot-melting. The connecting section and the flexible section can be combined by overlapping or petal-shaped hot-melting, which can avoid the connection between the connecting section, the transparent section and the flexible section from producing multiple colors due to hot-melting, which interferes with the doctor's judgment.

[0010] In one embodiment of the suction catheter provided by the present invention, the distal end of the flexible segment includes a plurality of corrugated structures connected end to end in the axial direction, so that the flexible segment has better flexibility to adapt to the shape of the bronchial duct, and the wave height of each corrugated structure is 0.2mm-0.4mm, and the wavelength is 1mm-2mm.

[0011] In one embodiment of the suction catheter provided by the utility model, at least one superelastic core wire with a wiring direction consistent with the multiple corrugated structures is embedded in the tube wall of the flexible segment, the core wire connects the multiple corrugated structures, and the distance between the distal end of the core wire and the distal end of the flexible segment is 1mm-3mm, which can prevent the distal end of the flexible segment from being folded after colliding with the bronchial wall.

[0012] In one embodiment of the suction catheter provided by the utility model, the suction catheter is a straight equal-diameter structure, and its tube wall is provided with a plurality of injection holes; or the distal end of the suction catheter has a pre-bent structure, and the large bend side of the pre-bent structure is provided with at least one injection hole; or the proximal end of the flexible segment is a tapered structure, and the inner diameter of the tapered structure gradually decreases from the proximal end to the distal end; the area of ​​the injection hole closest to the proximal end of the flexible segment is ±15% of the cross-sectional area of ​​the flow channel cavity of the suction catheter.

[0013] In one embodiment of the suction catheter provided by the present invention, the distal end of the transparent segment is coaxially stacked with the proximal end of the flexible segment; or the distal end of the transparent segment and the proximal end of the flexible segment both include a plurality of petals radially spaced from each other, and the plurality of petals of the transparent segment and the plurality of petals of the flexible segment are cross-stacked one by one.

[0014] When the suction catheter provided by the utility model includes a connecting section, the distal end of the connecting section is coaxially stacked with the proximal end of the flexible section; or the distal end of the connecting section and the proximal end of the flexible section both include a plurality of petals radially spaced from each other, and the plurality of petals of the connecting section and the plurality of petals of the flexible section are cross-stacked one by one.

[0015] In one embodiment of the suction catheter provided by the present invention, the ratio of the width of the petals of the transparent section to the width of the petals of the flexible section is 1.2-1.8.

[0016] In one embodiment of the suction catheter provided by the utility model, the inner wall of the transparent section is provided with multiple pairs of protrusions arranged in an axial direction, the two protrusions in each pair of protrusions are symmetrical about the axis, and the inner diameter of the flexible section is smaller than the inner diameter of the transparent section.

[0017] In one embodiment of the suction catheter provided by the utility model, at least one superelastic reinforcing wire is axially arranged inside the tube wall of the transparent section, and the reinforcing wire is connected to the core wire.

[0018] In one embodiment of the suction catheter provided by the utility model, the suction catheter also includes a three-way valve and a proximal joint fixedly connected to the proximal end of the transparent section, the three-way valve has an injection cavity, a suction catheter connecting cavity and a suction tube connecting cavity, the suction catheter connecting cavity is adapted to be plugged into the proximal joint, and the inner diameters of the suction catheter connecting cavity and the suction tube connecting cavity are both larger than the diameter of the flow channel cavity of the suction catheter.

[0019] Another aspect of the utility model is to provide a suction device which can enter the secondary bronchus along the insertion tube of the existing endoscope to perform alveolar lavage and can observe the flow channel conditions in real time.

[0020] A technical solution adopted to achieve the purpose of the utility model is: a suction device, including a suction catheter, and a three-way valve having an injection cavity, a suction catheter connecting cavity and a suction tube connecting cavity. The suction catheter includes an opaque flexible section located at the distal end, and a transparent section connected to the proximal end of the flexible section, and the hardness of the transparent section is greater than the hardness of the flexible section. The suction catheter connecting cavity is adapted to be plugged into the proximal end of the transparent section, and the suction tube connecting cavity is adapted to be plugged into the suction tube. The inner diameters of the suction catheter connecting cavity and the suction tube connecting cavity are both greater than the diameter of the flow channel cavity of the suction catheter.

[0021] In one embodiment of the suction device provided by the utility model, the suction device also includes a liquid collection bottle, the liquid collection bottle includes a bottle body with a distal opening and a proximal closed end, a distal end cap and a proximal end cap, the distal end cap is detachably connected to the distal end of the bottle body through a thread, the proximal end cap is detachably connected to the proximal end of the bottle body through a thread, and is adapted to be detachably connected to the distal end of the bottle body through a thread, and the suction tube is adapted to have two ends that are respectively connected to the suction tube connection cavity and the bottle body. Using the suction device, after obtaining the lavage fluid sample and removing the suction tube and the suction catheter, the distal end cap can be removed, and then the opening of the bottle body can be directly sealed with the proximal end cap to prevent the sample from being contaminated.

[0022] In one embodiment of the suction device provided by the utility model, the suction device further comprises a drain valve provided on the peripheral surface of the bottle body and a drain pipe connected to the drain valve. When a large amount of irrigation fluid is recovered, the drain valve can be opened to drain the excess irrigation fluid into a collection bucket or a waste liquid bucket, thereby avoiding frequent replacement of the bottle body and reducing the operation time. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] 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.

[0024] Figure 1 The structure diagram of the suction device provided in the first embodiment of the utility model is schematically shown;

[0025] Figure 2 Schematically shows the use of Figure 1 The suction device shown cooperates with an existing endoscope and its insertion tube to perform alveolar lavage;

[0026] Figure 3 Shows Figure 1A schematic diagram of the suction device shown after the distal end of the suction catheter passes through the insertion tube of the existing endoscope and enters the bronchus;

[0027] Figure 4 Shows Figure 3 The schematic diagram of the suction catheter after being cut open along the axial direction is shown;

[0028] Figure 4a Shows Figure 3 A schematic diagram of an improved embodiment of the suction catheter shown in FIG. 1 after being cut away along the axial direction;

[0029] Figure 5 A schematic diagram showing a transparent section and a flexible section of an aspiration catheter provided by an embodiment of the present utility model forming a pre-bent structure is shown;

[0030] Figure 6 The structure diagram of the suction catheter provided by another embodiment of the utility model after being cut open along the axial direction is schematically shown;

[0031] Figure 7 The structure diagram of the suction catheter provided by another embodiment of the utility model after being cut open along the axial direction is schematically shown;

[0032] Figure 8 The first structural diagram of the transparent section and the flexible section of the suction catheter provided by the first embodiment of the utility model after hot melting is schematically shown;

[0033] Fig. 9 The second structural schematic diagram of the transparent section and the flexible section of the suction catheter provided by the first embodiment of the utility model after hot melting is schematically shown;

[0034] Fig.10 The third structural schematic diagram of the transparent section and the flexible section of the suction catheter provided by the first embodiment of the utility model after hot melting is schematically shown;

[0035] Fig.11 Schematically shows Figure 5 A schematic diagram of the structure in which a spray hole is provided on the large curved side of the flexible section of the suction catheter;

[0036] Fig.12 The structure diagram of the liquid collecting device of the suction device provided by the first embodiment of the utility model is schematically shown;

[0037] Fig.13 Schematically shows Fig.12 A schematic diagram of the liquid collecting device shown after the liquid collecting bottle and the distal end cap are detachably separated;

[0038] Fig.14A schematic diagram schematically shows that the area of ​​at least one injection hole of the suction catheter provided by the second embodiment of the utility model is equivalent to the cross-sectional area of ​​the flow channel cavity;

[0039] Fig.15 The structure diagram of the liquid collecting device of the suction device provided in the third embodiment of the utility model is schematically shown;

[0040] Fig.16 The schematic diagram shows the structure of the cooperation between the suction catheter and the radioactive particles of the suction device provided by the fourth embodiment of the utility model;

[0041] Fig.17 The schematic diagram shows the structure of the cooperation between the suction catheter and the radioactive particles of the suction device provided in the fifth embodiment of the utility model;

[0042] Fig.18 Schematically shows Fig.17 A schematic diagram of the structure of the protrusion of the suction catheter after being cut open along the axial direction;

[0043] Fig.19 The structure diagram of the suction conduit of the suction device provided in the sixth embodiment of the utility model is schematically shown;

[0044] Fig. 20 The structure diagram of the suction conduit of the suction device provided by the seventh embodiment of the utility model is schematically shown;

[0045] Fig.21 The schematic diagram of the structure of the suction conduit of the suction device provided in the eighth embodiment of the present utility model is schematically shown. DETAILED DESCRIPTION

[0046] 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.

[0047] 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.

[0048] 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 body. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0049] 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.

[0050] 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.

[0051] See also Figure 1 The suction device 100 provided in the first embodiment of the utility model includes a suction catheter 110, a three-way valve 120 adapted to be plugged into the proximal end of the suction catheter 110, and a liquid collection device. The suction catheter 110 includes an opaque flexible section 112 located at the distal end, a proximal joint 113, and a transparent section 114 whose two ends are respectively fixed to and communicated with the flexible section 112 and the proximal joint 113. The liquid collection device includes a suction tube 134 and a negative pressure tube 135 respectively connected to the three-way valve 120, and a liquid collection bottle 130 connected to the proximal end of the suction tube 134 and the proximal end of the negative pressure tube 135. The three-way valve 120 is fixed to the distal end of the suction tube 134. When using the suction device 100, the proximal connector 113 needs to be inserted into the suction catheter connecting cavity 122 of the three-way valve 120 so that the two are fixedly connected to each other. After use, the proximal connector 113 needs to be pulled out from the suction catheter connecting cavity 122 of the three-way valve 120. The insertion and pulling out is the detachable connection between the suction catheter 110 and the three-way valve 120.

[0052] In an improved embodiment of the present invention, the three-way valve 120 is fixed to the proximal joint 113 of the suction catheter 110 and is formed integrally therewith, that is, the suction catheter 110 includes the three-way valve 120. In this case, when the suction device 100 is used, the distal end of the suction tube 134 needs to be inserted into the suction tube connection cavity 123 of the three-way valve 120 so that the two are fixedly connected to each other. After use, the suction tube 134 needs to be pulled out from the suction catheter connection cavity 122. This insertion and pulling out is the detachable connection between the suction catheter 110 and the suction tube 134.

[0053] The suction device 100 can be used with existing endoscopes and their insertion tubes. Figure 2 , the insertion tube 210 of the existing endoscope 200 can be first extended into the lesion segment bronchus of the patient's lung. Then, the distal end of the suction catheter 110 is extended from the distal end of the insertion tube 210 to a predetermined position of the patient's bronchus through the working channel 220 of the endoscope 200, such as Figure 3 As shown. The outer diameter of the suction catheter 110 is smaller than that of the insertion tube 210, so the suction catheter 110 can be extended into a deeper branch bronchus than the insertion tube 210, and the deep lesion segment can be cleaned more accurately. Then, the lavage fluid is injected through the injection port 121 of the three-way valve 120, and the lavage fluid passes through the suction catheter 110 as shown. Figure 4 The spray hole 1141 sprays into the bronchus of the lesion segment, thereby cleaning the bronchus of the lesion segment. Finally, the negative pressure source 300 is activated, and the liquid after bronchial lavage is sucked into the liquid collection bottle 130 through the suction catheter 110, the three-way valve 120, and the suction tube 134 for recovery, thereby completing the lavage of the bronchial alveoli of the lesion segment.

[0054] See also Figure 4 The transparent section 114 of the suction catheter 110 has a flow channel lumen 115 that passes through its distal end and proximal end. The diameter of the flow channel lumen 115 is 1.2 mm to 2.5 mm. The wall thickness of the suction catheter 110 is 0.1 mm to 0.3 mm. The suction catheter 110 can be a straight section structure as a whole, and the diameter (including the inner diameter and the outer diameter) along its axial direction is uniform, that is, the flexible section 112 and the transparent section 114 can be as follows Figure 4 As shown, they cooperate with each other to form a linear structure, or they can be Figure 4a As shown, the transparent section 114 has a uniform diameter in the axial direction, and the proximal end of the flexible section 112 forms a constriction structure, that is, the inner diameter of the constriction structure gradually decreases from the proximal end to the distal end, and the distal end of the flexible section 112 has a uniform diameter in the axial direction. The inner diameter of the proximal end of the flexible section 112 is smaller than the diameter of the flow channel cavity 115, for example, the inner diameter of the flexible section 112 can be 0.9mm-1.6mm. The beneficial effect of such a setting is that during the injection of the irrigation fluid, the smaller diameter at the constriction structure will lead to an increase in the fluid pressure, which is conducive to increasing the injection effect of the side hole, thereby improving the cleaning of the lesion segment and increasing the pathogen detection rate.

[0055] The distal end of the suction catheter 110 may also be configured as follows: Figure 5The pre-bent structure shown. When the lesion segment is relatively straight, a suction catheter with a straight segment structure can be selected. When the lesion bronchial segment has a certain angle, a suction catheter with a pre-bent structure can be selected to easily adjust the direction of entering the bronchus, so as to smoothly reach the lesion location, improve the success rate and accuracy of the lavage, and reduce the risk of the lavage fluid entering other bronchi, avoiding contamination of the obtained samples. The pre-bent angle a of the pre-bent structure can be between 20° and 60°, preferably 30° to 40°.

[0056] When the suction catheter 110 is pushed into the bronchus, its distal end may directly hit the inner wall of the bronchus. Therefore, the flexible section 112 needs to have a certain degree of flexibility to avoid damaging the inner wall of the bronchus, and is preferably made of polyurethane with a hardness of 35D. The length L1 of the flexible section 112 can be 3mm-15mm to avoid being folded after hitting the bronchial wall, preferably 5mm-10mm.

[0057] See also Figure 6 In another embodiment of the present invention, the flexible section 112 of the suction catheter 110 includes a plurality of corrugated structures 1123 connected end to end in the axial direction, which has better flexibility. The wave height h of each corrugated structure 1123 is 0.2-0.4 mm, and the wavelength L2 is 1 mm-2 mm. With such a configuration, even if the distal end of the flexible section 112 hits the bronchial wall, the deformation amount will not be too large, which can further avoid folding.

[0058] For further information, see Figure 7 In another embodiment of the utility model, at least one core wire 1121 is axially embedded in the tube wall of the flexible section 112 of the suction catheter 110. The wiring direction of the core wire 1121 is consistent with the waveform structure 1123. It is made of superelastic nickel-titanium material and can deform with the tube wall of the flexible section 112. The diameter is 0.03mm-0.1mm. The core wire 1121 can better support the flexible section 112, and further reduce the possibility of the distal end of the flexible section 112 hitting the bronchial wall and causing bends. The distance between the distal end of the core wire 1121 and the distal end of the flexible section 112 is 1mm-3mm to avoid the distal end of the core wire 1121 directly acting on the bronchial wall.

[0059] The flexible segment 112 may have a significant color difference from the inner wall of the bronchus, for example, the flexible segment 112 may be black or yellow, so that when the suction catheter 110 is observed through the endoscope 200, it can be quickly determined by the color difference whether the distal end of the flexible segment 112 has reached the predetermined position.

[0060] The hardness of the transparent section 114 is greater than that of the flexible section 112. In order to achieve better recovery of irrigation fluid through negative pressure suction, the flow channel cavity 115 needs to have a larger cross-sectional area, and the wall thickness of the suction catheter 110 needs to be as thin as possible, but the suction catheter 110 needs to withstand the negative pressure caused by the suction process to avoid collapse, and can effectively support the force of pushing the suction catheter 110 to the distal end to ensure that the suction catheter 110 can be pushed to the target lesion segment. Therefore, in this embodiment, the transparent section 114 is made of a nylon elastomer with a hardness of 72D or 55D, and the preferred wall thickness is 0.15mm-0.27mm.

[0061] Since the transparent section 114 is transparent, the operator can directly observe through the endoscope in real time whether the flow channel of the transparent section 114 is blocked and whether the irrigation fluid in the transparent section 114 is completely recovered. In this way, the operator can make correct judgments and timely treatments based on the observed situation to avoid unnecessary harm to the patient.

[0062] As an improved embodiment, the inner wall of the suction catheter 110 can be coated with a hydrophilic coating to make its inner wall more lubricated, promote the suction of mucus or other secretions to the outside of the body, and further avoid blockage in the tube. The material of the hydrophilic coating can be a commonly used material in the field, which will not be described here. The transparency of the transparent section 114 can be 60%-95%. Therefore, when the hydrophilic coating is made on the inner wall of the transparent section 114, ultraviolet light can effectively irradiate the inner wall of the transparent section 114 to solidify the hydrophilic coating, so that it is more conducive to the suction of the irrigation fluid when the negative pressure suction is used to recover the irrigation fluid.

[0063] The flexible section 112 and the transparent section 114 can be fused to each other by high temperature heat melting, for example, Figure 8 The distal end surface of the transparent section 114 shown in the figure is fixed to the proximal end surface of the flexible section 112 by hot melting; Fig. 9 The stacked hot melt shown, that is, the wall thickness of the transparent section 114 is less than the wall thickness of the flexible section 112, the distal end 1142 of the transparent section 114 is stacked on the proximal end 1122 of the flexible section 112, this hot melt has a large contact area and is more solid; or, further, as Fig.10The petals shown are cross-hot-melted. The distal end 1142 of the transparent section 114 and the proximal end 1122 of the flexible section 112 are respectively cut radially into a plurality of petals separated from each other, and the petals of the two are cross-layered one after another, and then melted into one by high-temperature hot-melting. This hot-melting method is more uniform and firm. The petal width of the flexible section 112 is W1, and the petal width of the transparent section 114 is W2. Since the material of the flexible section 112 is polyurethane with a melting point of 100-120°C, and the material of the transparent section 114 is nylon elastomer with a melting point of 120°C to 200°C, that is, under the same high-temperature hot-melting, the flexible section 112 is more easily melted into a liquid state than the transparent section 114. Therefore, in order to make the fusion of the two more synchronous and uniform, the ratio of the petal width W2 to W1 can be 1.2-1.8.

[0064] See also Figure 4 In this embodiment, a plurality of injection holes 1141 are provided on the tube wall at the distal end of the transparent section 114 close to the flexible section 112. As an improved embodiment, a plurality of injection holes may also be provided on the tube wall of the flexible section 112. The shape of each injection hole 1141 may be circular, or may be other shapes such as an ellipse or a diamond. The number of injection holes is 1-5, preferably 3. The injection holes 1141 are evenly distributed in the circumferential direction of the transparent section 114. The connecting line of the centers of all the injection holes 1141 is a spiral line along the axial direction. The center distance between two adjacent injection holes 1141 may be 1-5mm, the distance between the distal end face of the flexible section 112 and the nearest injection hole 1141 may be 5-15mm, and the area of ​​the injection hole 1141 may be 0.28mm 2 -1.77mm 2 , preferably 0.38mm 2 -0.9mm 2 .

[0065] The lesions are often located on the inner wall of the bronchus or other bronchial branch segments. The spray hole 1141 is provided to facilitate the lavage fluid to be sprayed out from the spray hole 1141, thereby achieving precise cleaning of the lesion site and improving the cleaning effect. More pathogens are also sucked out along with the lavage fluid, thereby increasing the detection rate of pathogens.

[0066] When the distal end of the suction catheter 110 has a pre-bent structure, see Fig.11 At least one injection hole 1141 is provided on the large curved side of the suction catheter 110. The arrow in the figure indicates the direction in which the irrigation fluid flows during the injection irrigation process. Fig.11 It can be seen that the lavage fluid will directly rush to the larger bend side of the curved part first. At this moment, the pressure on the larger bend side is relatively large. Setting the injection hole 1141 on the larger bend side is conducive to the spraying of the lavage fluid from the injection hole 1141, thereby achieving the purpose of circumferential lavage and better cleaning the diseased segment of the bronchus.

[0067] See also Figure 1, the three-way valve 120 includes an injection cavity 121, a suction catheter connecting cavity 122 and a suction tube connecting cavity 123. Among them, the suction catheter connecting cavity 122 is connected to the proximal connector 113, and the suction tube connecting cavity 123 is connected to the suction tube 134. In clinical application scenarios, the aspirated irrigation fluid or mucus will first be sucked into the flow channel cavity 115, and then collected in the liquid collection bottle 130 after passing through the suction catheter connecting cavity 122, the suction tube connecting cavity 123 and the suction tube 134. Therefore, the inner diameters of the suction catheter connecting cavity 122 and the suction tube connecting cavity 123 are both larger than the diameter of the flow channel cavity 115 as shown in the figure to avoid the three-way valve 120 from being blocked.

[0068] Please also read Figure 1 and Fig.12 The liquid collecting bottle 130 includes a first end cap 131, a second end cap 132 and a bottle body 133. The first end cap 131 is provided with a long connecting shaft 1311 and a short connecting shaft 1312, and the long connecting shaft 1311 and the short connecting shaft 1312 both have through holes. The suction tube 134 and the negative pressure tube 135 are both open at both ends, the proximal end of the suction tube 134 is connected with the long connecting shaft 1311, and the proximal end of the negative pressure tube 135 is connected with the short connecting shaft 1312. The inner diameter of the suction tube 134 is larger than the diameter of the suction catheter flow channel cavity 115 to prevent the suction tube 134 from being blocked by the sucked mucus. The suction tube 134 is adapted to be connected to the bottle body 133 and the three-way valve 120 at both ends respectively to introduce the sucked detection liquid into the bottle body 133.

[0069] The end face 1312a of the short connecting shaft 1312 is lower than the open end face 131a of the first end cap 131. In clinical application scenarios, the negative pressure source will be started first, and the bottle body 133 will be in a negative pressure state through the short connecting shaft 1312, so that the lavage fluid of each bronchial segment is sucked into the bottle body 133 through the suction catheter 110 and the long connecting shaft 1332. The short connecting shaft 1312 is short and inside the first end cap 131, which can avoid the lavage fluid from the short connecting shaft 1312 to the negative pressure source as much as possible, causing the negative pressure source to be contaminated or damaged. At the same time, the long connecting shaft 1332 is set at the center of the first end cap 131, so that the recovered liquid drips from the center of the bottle body 133, so that the liquid splashes evenly, reducing the risk of the splashing liquid being sucked away by the short connecting shaft 1312, and avoiding contamination of the negative pressure source.

[0070] See also Fig.13 The distal end 1331 of the bottle body 133 is open and the proximal end 1332 is closed, and both ends are provided with external threads, and the thread structure is consistent. Please refer to Fig.12 and Fig.13The first end cap 131 is provided with an internal thread matching the external thread of the distal end 1331, and the first end cap 131 can be sleeved on the distal end 1331 of the bottle body 133 by locking the internal thread with the external thread of the distal end 1331. The second end cap 132 is provided with an internal thread, and the second end cap 132 can be sleeved on the proximal end 1332 of the bottle body 133 by locking the internal thread with the external thread of the proximal end 1332.

[0071] In the alveolar lavage surgery, after the lavage fluid is sucked from the bronchial segment into the bottle 133, the first end cap 131 needs to be unscrewed to disconnect the connection between the suction tube 134 and the suction catheter 110 and the connection between the negative pressure tube 135 and the negative pressure source 300, which means that the distal end of the bottle 133 connected to the first end cap 131 is in an open state, and the lavage fluid is more likely to be contaminated during the inspection process. When using the liquid collection device provided in this embodiment, after disconnecting the connection between the suction tube 134 and the suction catheter 110 and the connection between the negative pressure tube 135 and the negative pressure source 300, the first end cap 131 and the second end cap 132 can be quickly unscrewed, the first end cap 131 can be removed from the bottle 133 and treated as waste, and the second end cap 132 and the first open end 1331 can be screwed together to quickly seal the opening of the distal end 1331 of the bottle 133 to prevent the lavage fluid in the bottle 133 from being contaminated.

[0072] In the suction catheter 110 provided in the second embodiment of the present invention, see Fig.14 , from the direction of the flexible segment 112 to the proximal end of the transparent segment 114, the tube wall of the transparent segment 114 has a first injection hole 1114a, a second injection hole 1114b, a third injection hole 1114c, and so on. Among them, the first injection hole 1141a is closest to the proximal end of the flexible segment 112, and its area is equivalent to the cross-sectional area of ​​the flow channel cavity 115 of the suction catheter 110. The advantage of such a setting is that the suction area of ​​the suction catheter 110 can be increased and the suction efficiency can be improved. At the same time, the area of ​​at least one injection hole is equivalent to the cross-sectional area of ​​the flow channel cavity, that is, the suction capacity of the circumferential direction and the axial direction of the transparent segment 114 are equivalent, which is conducive to the injection hole to attract the lavage fluid or mucus on the wall of the bronchial segment during the suction process, thereby improving the suction efficiency. Also, because the lesions are mainly on the walls of each bronchial segment, the lavage fluid or mucus attracted by the inner wall has a higher accuracy rate in pathogen detection. As a preference, the area of ​​the first injection hole 1141a is ±15% of the cross-sectional area of ​​the flow channel cavity 115, because the first injection hole 1141a is located deeper in the bronchus than other injection holes, and thus produces a better suction effect.

[0073] The width of the first injection hole 1114a projected in the circumferential direction is smaller than the outer diameter of the suction tube 120. The advantage of this arrangement is that when the suction tube 110 needs to be bent, the maximum stress during the bending process is at the maximum contour of the suction tube 110, which can ensure sufficient support at the maximum contour to avoid bending.

[0074] During bronchoalveolar lavage, a large amount of lavage fluid may be used, requiring multiple collection bottles to complete the lavage fluid recovery. Fig.15 The third embodiment of the present invention provides a drain valve 136 on the circumference of the bottle body 133 of the liquid collecting device 130. The drain valve 136 is connected to a drain pipe 137. The other end of the drain pipe 137 is connected to a liquid collecting bucket or a waste liquid bucket. The distance L between the drain valve 136 and the end surface 1321 of the second end cover 132 can be 2-10 mm. When the amount of irrigation fluid recovered is large, the drain valve 136 can be opened to drain the excess irrigation fluid into the liquid collecting bucket or the waste liquid bucket, thereby avoiding frequent replacement of the bottle body and reducing the operation time.

[0075] For lesions with general inflammatory pathology, the lesion segment can be cleaned by selecting appropriate lavage fluid. However, for patients with bronchial tumors, radioactive particles are clinically required for treatment. The diameter of the standard radioactive particles is 0.8 mm and the length is 5 mm.

[0076] See also Fig.16 The suction catheter provided in the fourth embodiment of the utility model is suitable for the application scenario of treating bronchial tumors with radioactive particles. The flexible section 112 is a constricted structure, that is, the inner diameter is smaller than the diameter of the flow channel cavity 115. The inner diameter of the flexible section 112 can be 0.3-0.7 mm, so as to be used together with the radioactive particles 500. The radioactive particles 500 can enter the edge of the flexible section 112 through the flow channel cavity 115. Since the inner diameter of the flexible section 112 is smaller than the outer diameter of the radioactive particles 500, the flexible section 112 plays a role in limiting the position of the radioactive particles 500, and the radioactive particles 500 can be pushed to the target position for treatment.

[0077] If the diameter of the flow channel cavity 115 of the transparent section 114 is too large, multiple radioactive particles will overlap in the flow channel cavity 115, resulting in different stacking shapes, and the radiation effect cannot be judged, which affects the treatment effect. Therefore, the diameter of the flow channel cavity 115 can be 0.9-1.5mm to ensure that multiple particles do not overlap in the flow channel cavity 115.

[0078] In order to arrange the radioactive particles in an orderly and planned manner and achieve precise treatment, in the suction catheter 110 provided in the fifth embodiment of the present invention, as shown in FIG. Fig.17As shown, the transparent section 114 includes a plurality of pairs of protrusions 1142 arranged at equal intervals on its inner wall. The two protrusions 1142 in each pair of protrusions are symmetrical about the axis, and the cavity diameter A defined by each pair of protrusions 1142 is 0.65-0.75 mm, that is, the difference between the outer diameter of the radioactive particle and the diameter A of the protrusion is 0.05-0.15 mm, and the distance L4 between two adjacent protrusions 1142 is 10-15 mm, and the two adjacent pairs of protrusions 1142 form a limiting groove. During use, the sheath core push rod 600 can be used to push the radioactive particle 500 into the limiting groove from the water inlet direction of the flow channel cavity 115. Even if the protrusion 1142 is encountered during the pushing process, since the radioactive particle 500 and the protrusion 1142 are interference fit, and the protrusion 1142 is a polymer material with a certain elasticity, the radioactive particle 500 can be pushed lightly through the protrusion 1142 and enter the required limiting groove.

[0079] Further, as a preferred embodiment, see Fig.18 The cross section of the protrusion 1142 cut along the axial direction is wedge-shaped, and the angle between the protrusion 1142 and the axial direction forms an acute angle β, and the degree of the acute angle β is 30°-60°, which is conducive to the sheath core push rod 600 pushing the radioactive particles 500 through the protrusion 1142. The protrusion 1142 forms an obtuse angle β in the opposite direction of the axial direction, thereby preventing the patient from having a severe cough vibration process that causes the radioactive particles 500 to move proximally.

[0080] During alveolar lavage, when the bronchoscope is pushed distally along the bronchial tract, the opening of the bronchial branch in front may be elliptical, with the opening area larger than the cross-sectional area of ​​the bronchoscope and the short axis of the ellipse smaller than the diameter of the bronchoscope, resulting in the bronchoscope being unable to pass through the bronchial branch.

[0081] For this purpose, see Fig.19 The sixth embodiment of the utility model provides a transparent section 114 of the suction catheter 110, in which at least one reinforcing wire 1142 is embedded in the tube wall along the axial direction. The reinforcing wire 1142 is made of superelastic nickel-titanium material, which provides good support for the transparent section 114. When encountering the situation described in the previous paragraph, the bronchoscope can be pushed to the elliptical opening of the bronchial branch, and the suction catheter 110 enters the bronchus through the working channel of the bronchoscope. Since the diameter of the suction catheter 110 is relatively small compared to the diameter of the bronchoscope, it can pass through the bronchial branch with the elliptical opening more smoothly. At this time, the transparent section 114 plays the role of guiding the bronchoscope, and the bronchoscope can be pushed to the distal end along the transparent section 114. In addition, the reinforcing wire 1142 in the transparent section 114 can provide sufficient support, so that the bronchoscope can enter the desired bronchial branch when it is pushed to the elliptical opening, so as to make full preparations for the subsequent surgery.

[0082] In addition, in the suction catheter provided in the seventh embodiment of the present invention, the reinforcing wire 1142 can be as follows: Fig. 20As shown, the core wire 1121 is formed as a whole with the core wire 1121, thereby preventing the junction of the two from being bent due to support. In clinical application scenarios, the transparent segment 114 requires stronger support to support the pushing of the bronchoscope, so the diameter of the core wire 1121 of the flexible segment 112 is smaller than the diameter of the reinforcing wire 1142 of the transparent segment 114. As a preferred embodiment, the diameter ratio of the core wire 1121 to the reinforcing wire 1142 can be 0.5-0.8.

[0083] See also Fig.21 Compared with the first embodiment, the suction catheter provided in the eighth embodiment of the present invention includes not only the flexible section 112 and the transparent section 114 located at the distal end, but also a connecting section 116 located between the transparent section 114 and the flexible section 112 and having both ends fixedly connected and communicating with the two. The connecting section 116 and the transparent section 114 are made of the same material, but the colors are different. The connecting section 116 and the flexible section 112 are made of different materials and have the same color. In this way, the connecting section 116 and the transparent section 114 can be used as follows Figure 8 The hot melt method shown in the figure can achieve a firm connection between the two without using Fig. 9 Or overlapping hot melting or petal melting as shown in 10; at the same time, the connecting section 116 and the flexible section 112 can be used as Fig. 9 or Fig.10 The overlapping hot-melt or petal-shaped hot-melt bonding method shown in the figure is cross-bonded to each other firmly, and the overlapping parts of the two will not produce color changes, thereby avoiding various color differences in the overlapping parts after hot-melt, which may cause misjudgment by doctors.

[0084] The above is a relatively detailed description of the suction catheter and suction 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 applied in other related technical fields are included in the patent protection scope of the utility model.

Claims

1. A suction catheter for entering the bronchus along the insertion tube of an endoscope for alveolar lavage, characterized in that: The suction catheter comprises an opaque flexible section located at a distal end, and a transparent section connected to a proximal end of the flexible section, wherein the hardness of the transparent section is greater than that of the flexible section.

2. The suction catheter according to claim 1, characterized in that The suction catheter also includes a connecting section, both ends of which are respectively fixed to and communicated with the flexible section and the transparent section, the connecting section and the transparent section are made of the same material but different colors, and the connecting section and the flexible section are made of different materials but the same color.

3. The suction catheter according to claim 1, characterized in that The distal end of the flexible section includes a plurality of corrugated structures connected end to end in sequence along the axial direction, and the wave height of each corrugated structure is 0.2 mm-0.4 mm and the wavelength is 1 mm-2 mm.

4. The suction catheter according to claim 3, characterized in that At least one superelastic core wire having a wiring direction consistent with the plurality of wave structures is embedded in the tube wall of the flexible section, and the distance between the distal end of the core wire and the distal end of the flexible section is 1 mm-3 mm.

5. The suction catheter according to claim 1, characterized in that The inner wall of the transparent section is provided with a hydrophilic coating, and the transparency of the transparent section is 60%-95%.

6. The suction catheter according to claim 1, characterized in that The suction catheter is a straight equal-diameter structure, and a plurality of injection holes are provided on its wall; or the distal end of the suction catheter has a pre-bent structure, and at least one injection hole is provided on the large bend side of the pre-bent structure; or the proximal end of the flexible section is a tapered structure, and the inner diameter of the tapered structure gradually decreases from the proximal end to the distal end; the area of ​​the injection hole closest to the proximal end of the flexible section is ±15% of the cross-sectional area of ​​the flow channel cavity of the suction catheter.

7. The suction catheter according to claim 2, characterized in that The distal end of the connecting segment is coaxially stacked with the proximal end of the flexible segment; or the distal end of the connecting segment and the proximal end of the flexible segment both include a plurality of radially spaced petals, and the plurality of petals of the connecting segment and the plurality of petals of the flexible segment are cross-stacked one by one.

8. The suction catheter according to claim 1, characterized in that The inner wall of the transparent section is provided with a plurality of pairs of protrusions spaced apart in the axial direction, the two protrusions in each pair of protrusions are symmetrical about the axis, and the inner diameter of the flexible section is smaller than the inner diameter of the transparent section.

9. The suction catheter according to claim 4, characterized in that At least one superelastic reinforcing wire is axially arranged inside the tube wall of the transparent section, and the reinforcing wire is connected to the core wire.

10. The aspiration catheter according to claim 1, wherein: The suction catheter also includes a three-way valve and a proximal connector fixedly connected to the proximal end of the transparent section, the three-way valve having an injection cavity, a suction catheter connecting cavity and a suction tube connecting cavity, the suction catheter connecting cavity being adapted to be plugged into the proximal connector, the inner diameters of the suction catheter connecting cavity and the suction tube connecting cavity being both larger than the diameter of the flow channel cavity of the suction catheter.

11. A suction device, comprising the suction catheter according to any one of claims 1 to 9, characterized in that: The suction device also includes a three-way valve having an injection chamber, a suction catheter connecting chamber and a suction tube connecting chamber. The suction catheter connecting chamber is adapted to be plugged into the proximal end of the transparent section, and the suction tube connecting chamber is adapted to be plugged into the suction tube. The inner diameters of the suction catheter connecting chamber and the suction tube connecting chamber are both larger than the diameter of the flow channel chamber of the suction catheter.

12. The suction device according to claim 11, characterized in that The suction device also includes a liquid collecting bottle, which includes a bottle body with an opening at the distal end and a closed proximal end, a distal end cover and a proximal end cover, wherein the distal end cover is detachably connected to the distal end of the bottle body through a thread; the proximal end cover is detachably connected to the proximal end of the bottle body through a thread, and is adapted to be detachably connected to the distal end of the bottle body through a thread, and the suction tube is adapted so that its two ends are respectively connected to the suction tube connecting cavity and the bottle body.

13. The suction device according to claim 12, characterized in that The suction device further comprises a liquid discharge valve arranged on the peripheral surface of the bottle body and a liquid discharge pipe communicated with the liquid discharge valve.

Images