Novel lavage catheter

Abstract

A lavage catheter, comprising a main catheter (1) used for passing through a bronchoscope. The main catheter (1) comprises a helical framework (11) used for releasing and recovering a lavage fluid, and further comprises a sheath (12) fixedly connected to the outer peripheral surface of the proximal end of the helical framework (11). The proximal end of the helical framework (11) is used connecting to a water injection and suctioning device, and the helical framework (11) is a metal spring framework. By providing the metal spring framework, it can be ensured that the inner diameter of the main catheter (1) is greater than the inner diameter of a catheter made of a pure plastic tube while the same outer diameter is used, thereby improving suction efficiency, and also avoiding collapse.

Description

New irrigation catheter Technical Field

[0001] This application claims priority to patent application number CN202322407802.1, filed September 6, 2023, entitled "Novel Irrigation Catheter," which is deemed to be incorporated herein by reference in its entirety. The present invention relates to alveolar lavage technology, and more particularly to a novel irrigating catheter. Background Art

[0002] Bronchoalveolar lavage (BAL) is a non-invasive procedure performed via bronchoscopy and has become widely accepted in disease diagnosis. By injecting a sufficient amount of lavage fluid into the alveoli and then aspirating it thoroughly, BAL fluid analysis at the alveolar level reveals important information, such as immune cells, inflammatory cells, cytology, and pathogenicity of the infecting microorganisms, assisting in the diagnosis, observation, and prognosis of respiratory diseases. Most existing lavage devices use a bronchoscope directly for lavage. Due to the large diameter of the bronchoscope, deep insertion into the target lesion is difficult, leading to problems such as excessive lavage coverage and contamination of the lavage fluid, which can complicate diagnosis. When a smaller diameter catheter is used for deep insertion into the bronchi and lavage, the delicate branching bronchus, lacking cartilage support, can easily collapse under negative suction pressure, blocking the catheter's outlet opening. Despite its potential clinical benefits, precision alveolar lavage has been limited due to a lack of appropriate equipment and application difficulties. The present invention provides a catheter for precision alveolar lavage and a corresponding application solution.

[0003] For example, the invention patent with the authorization announcement number CN114699635B and the authorization announcement date March 24, 2023, is named an alveolar lavage device, comprising a main catheter for passing through a bronchoscope and a connecting assembly for connecting the outer end of the main catheter with a water injection and suction device; the inner end of the main catheter forms a head for protruding the bronchoscope to extend into the pulmonary bronchus; the main catheter has a water injection and suction flow channel group for injecting or absorbing water, the water injection and suction flow channel group includes at least one flow channel, and each flow channel extends into the head, and the head has an opening connected to each flow channel; wherein, the length of the main catheter is 80-150 cm, and the cross-sectional area of ​​each flow channel in the water injection and suction flow channel group is 0.5-6.2 square millimeters, and the length of the main catheter is positively correlated with the area of ​​the flow channel cross-section. Technical issues

[0004] Most bronchoscopes in the prior art are made of plastic tubes, and plastic tubes must have a certain wall thickness to prevent collapse during suction. Therefore, under the same outer diameter, the inner diameter of a catheter made of pure plastic tube is relatively thin, and the efficiency during suction is also lower. Technical Solutions

[0005] The purpose of the present invention is to provide a novel irrigation catheter to solve the above-mentioned deficiencies in the prior art.

[0006] In order to achieve the above object, the present invention provides the following technical solutions:

[0007] A novel irrigation catheter comprises a main catheter for passing through a bronchoscope; the main catheter comprises a spiral skeleton for releasing and recovering irrigation fluid, and also comprises an outer skin fixedly connected to the outer peripheral surface of the proximal end of the spiral skeleton, and the proximal end of the spiral skeleton is used to connect to a water injection and suction device.

[0008] The above-mentioned novel irrigation catheter has a water injection and absorption channel group for injecting and absorbing water in the main body catheter, and the water injection and absorption channel group includes at least one channel.

[0009] In the above-mentioned novel irrigation catheter, the material of the spiral skeleton of the main catheter is one or more of stainless steel wire, nickel-titanium alloy wire and cobalt-based alloy wire, and the main catheter is made by spiral winding.

[0010] In the novel irrigation catheter, the spiral skeleton is a round wire, and the diameter of the round wire is 0.03-0.5 mm.

[0011] In the novel irrigation catheter, the spiral skeleton is a flat wire, and the cross-sectional length of the flat wire is 0.1-0.7 mm and the height is 0.01-0.3 mm.

[0012] The above-mentioned new irrigation catheter has a spiral skeleton divided into a distal soft segment and a proximal hard segment. The spacing of the metal wires of the distal soft segment is 0.05-3mm. The length of the distal soft segment of the spiral skeleton is 5-60mm, and the spacing of the wires of the proximal hard segment is 0-3mm.

[0013] In the above-mentioned novel irrigation catheter, the distal end of the spiral skeleton is a tapered structure.

[0014] The novel irrigation catheter mentioned above has a plurality of markings provided on the distal end of the outer sheath.

[0015] The above-mentioned novel irrigation catheter has an inner tube sheathed inside the main catheter.

[0016] In the above-mentioned novel irrigation catheter, a Luer connector is provided at the proximal end of the main catheter. Beneficial effects

[0017] In the above technical solution, the present invention provides a new type of irrigation catheter, including a main catheter for passing through a bronchoscope, which is connected by a metal spring frame and an outer skin. The metal spring frame can ensure that the inner diameter of the main catheter is larger than the inner diameter of a catheter made of a pure plastic tube under the same outer diameter, thereby improving the efficiency of suction and avoiding collapse. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments described in the present invention. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.

[0019] FIG1 is a schematic structural diagram of a novel irrigation catheter provided by an embodiment of the present invention.

[0020] FIG2 is a schematic structural diagram of a helical skeleton provided by an embodiment of the present invention.

[0021] FIG3 is a schematic structural diagram of a spiral skeleton provided by another embodiment of the present invention.

[0022] FIG4 is a schematic structural diagram of a spiral skeleton provided by another embodiment of the present invention.

[0023] FIG5 is a schematic diagram of liquid inlet into a novel irrigation catheter provided by an embodiment of the present invention.

[0024] FIG6 is a schematic structural diagram of a main catheter provided by yet another embodiment of the present invention.

[0025] FIG7 is a partial view of FIG6 of the present invention.

[0026] FIG8 is a cross-sectional view of a spiral skeleton and an inner tube provided in yet another embodiment of the present invention.

[0027] FIG9 is a cross-sectional view of a spiral skeleton and a spiral liquid tube provided in another embodiment of the present invention.

[0028] FIG10 is a cross-sectional view of a novel irrigation catheter provided in yet another embodiment of the present invention.

[0029] FIG11 is a cross-sectional view of a novel irrigation catheter provided by yet another embodiment of the present invention during irrigation.

[0030] FIG12 is a partial enlarged view of point X in FIG11 of the present invention.

[0031] Description of reference numerals:

[0032] 1. Main conduit; 11. Spiral skeleton; 12. Outer skin; 121. Mark; 13. Inner tube; 14. Spiral liquid tube; 141. Installation section; 142. Movable section; 144. First liquid inlet and outlet channel; 145. Second liquid inlet and outlet channel; 15. Auxiliary conduit; 16. One-way flow component; 161. Connecting channel; 162. First movable piece; 163. Second movable piece; 164. Stopper; 17. Deformation section; 171. Annular deformation protrusion; 172. Liquid passing cylinder; 173. Connecting hole; 174. Fixed part; 2. Connector. Modes for Carrying Out the Invention

[0033] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings.

[0034] In each embodiment of the present invention, "proximal end" and "distal end" refer to the relative orientation, relative position, and direction of components or actions relative to each other from the perspective of a doctor using the medical device. Although "proximal end" and "distal end" are not rights-restrictive, "proximal end" generally refers to the end of the medical device that is close to the doctor during normal operation, and "distal end" generally refers to the end that first enters the patient's body away from the doctor.

[0035] As shown in Figures 1-12, an embodiment of the present invention provides a new type of irrigation catheter, including a main catheter 1 for passing through a bronchoscope; the main catheter 1 includes a spiral skeleton 11 for releasing and recovering irrigation fluid, and also includes an outer skin 12 fixedly connected to the proximal outer peripheral surface of the spiral skeleton 11, and the proximal end of the spiral skeleton is used to connect a water injection and suction device.

[0036] Specifically, in this embodiment, the main catheter 1 is divided into a distal end and a proximal end. The distal end is formed by the main catheter 1 for inserting into the pulmonary bronchus, while the proximal end is formed by the main catheter 1 for protruding a bronchoscope. The proximal end is connected to a water injection and suction device via a connector 2, such as a Luer connector. This water injection and suction device is conventional and is used to inject and recover lavage fluid into the main catheter 1. This device is widely used in alveolar lavage and will not be described in detail here. The spiral skeleton 11 has a spring-like appearance, comprising multiple helical coils. These coils are preferably elastic, but may not be. To ensure smooth recovery of lavage fluid, a gap is provided between each of the coils at the distal end of the spiral skeleton 11. Specifically, a distal hole (hereinafter referred to as the inlet and outlet gap) is provided at the distal end of the spiral skeleton 11. At the same time, the spiral skeleton 11 is less likely to collapse than a pure plastic tube, ensuring that the irrigation fluid can flow smoothly. In addition, the material of the spiral skeleton 11 is preferably a metal material, which can ensure a certain connection strength of the spiral skeleton 11. Preferably, the proximal end of the spiral skeleton 11 is connected to the water injection and suction device through a Luer connector; during specific operation, the main catheter 1 is extended into the patient's lungs, and the irrigation fluid is injected into the patient's lungs by the water injection and suction device. The irrigation fluid flows along the injection and suction flow channel group and cleans the patient's lungs. The water injection and suction device can also control the inlet rate and the suction rate of the irrigation fluid. When the irrigation is completed, the irrigation fluid in the patient's lungs is sucked out by the water injection and suction device. At this time, the irrigation fluid is recovered through the inlet and outlet gaps of the spiral skeleton 11 and enters the injection and suction flow channel group.

[0037] The function of the outer skin 12 is to prevent liquid from leaking from the proximal end of the main catheter 11 during injection or aspiration, and then leaking into the bronchoscope, resulting in low efficiency of injection or aspiration; the outer skin 12 is preferably made of plastic, and the outer skin 12 is fixedly connected to the outer peripheral surface of the proximal end of the spiral skeleton 11, and the proximal end of the spiral skeleton is used to connect the water injection and aspiration device.

[0038] In addition, the present invention also provides another embodiment of the outer skin 12, which is put on the proximal end of the main catheter 11. The outer skin 12 is cylindrical and its purpose is similar to that of a sheath. The outer skin 12 is preferably made of plastic. The outer skin 12 is used to protect the spiral skeleton 11. When the main catheter 1 needs to be inserted into the patient's lungs, the spiral skeleton 11 and the sleeved outer skin 12 are inserted together or the outer skin 12 is inserted first. After the spiral skeleton 11 reaches the specified position, the outer skin 12 is pulled back to expose the distal spiral skeleton 11.

[0039] In this embodiment, the first-generation plastic irrigation catheter without the spiral skeleton 11 has a suction efficiency of 34 ml in 20 seconds, a bleeding rate of 70%, a minimum turning diameter of 55 mm, and an average liquid recovery rate of 55%. Under the same other conditions (such as speed, etc.), when suction is performed through the main catheter 1 equipped with the spiral skeleton 11, the suction efficiency is 47 ml of irrigation fluid can be sucked in 20 seconds and the average liquid recovery rate is 75%. The efficiency during suction is significantly improved and the average liquid recovery rate is also increased. In addition, when suction is performed with the main catheter 1 equipped with the spiral skeleton 11, the bleeding rate is less than 5%, eliminating damage to the lung tissue during suction. At the same time, the main catheter 1 equipped with the spiral skeleton 11 has a minimum turning diameter of 10 mm, is more flexible, and can better protect the lung tissue.

[0040] In the prior art, when a plastic tube is inserted into a patient's lungs, injection or aspiration is performed through the side holes and top hole. When negative pressure occurs within the plastic tube, i.e., when aspiration is performed through the side holes, the side holes are easily adsorbed directly onto the lung tissue. When the pressure is too high, the lung tissue may bleed. In this embodiment, because the inlet and outlet gaps are evenly distributed and the inlet and outlet openings of the inlet and outlet gaps are significantly larger than the side holes, the irrigating fluid can flow in or out of the inlet and outlet gaps from multiple locations, resulting in a uniform and lower pressure distribution, which is less likely to cause lung tissue bleeding. Furthermore, a small amount of irrigating can achieve the same effect as a large amount of irrigating with a plastic tube. Furthermore, irrigating fluid can be aspirated from multiple larger locations, resulting in higher irrigating fluid recovery efficiency and less residual irrigating fluid. It is conceivable that the functions achieved by the spiral skeleton 11 described above can also be achieved by increasing the size of the side holes of the plastic tube. However, if the side holes of the plastic tube are increased in size, the end of the plastic tube extending into the lung will not easily maintain its tubular shape under negative pressure, which will affect the recovery of the irrigating fluid.

[0041] Obviously, the existing pure plastic tube head is cylindrical, and it is still not easy to deform when encountering an object obstruction. That is to say, when the plastic tube head is inserted into the lungs and encounters lung tissue, it is easy to cause damage to the lung tissue. Relatively speaking, the distal end of the spiral skeleton 11 will deviate to one side when encountering an object obstruction, and is softer. The minimum turning diameter of the spiral skeleton 11 is 10 mm, which is significantly reduced compared to the minimum turning diameter of 55 mm of the plastic tube. Therefore, it will not directly exert direct pressure on the lung tissue and can better protect the lung tissue.

[0042] In addition, the plastic tube is prone to folding when inserted into the lungs. If folded, the flow of the irrigation fluid will be obstructed, especially when aspirating the irrigation fluid. Even if the pressure is increased, the folded part of the plastic tube cannot be cleared and will further collapse. However, the spiral skeleton 11 will not fold when working, ensuring the smooth flow of the irrigation fluid.

[0043] In another embodiment provided by the present invention, the main catheter 1 has a water injection and suction flow channel group for injecting water (irrigation fluid) and absorbing water. The water injection and suction flow channel group includes at least one flow channel, and the irrigation fluid flows out of or into the lung tissue through the water injection and suction flow channel group.

[0044] In another embodiment provided by the present invention, the length of the main catheter 1 is 80-150 cm, the inner diameter of the catheter body is 0.5-2.3 mm, and the outer diameter is 0.6-2.4 mm. This size range fits the size of most lung bronchi.

[0045] In another embodiment provided by the present invention, the material of the spiral skeleton 11 of the main catheter 1 is one or more of stainless steel wire, nickel-titanium alloy wire and cobalt-based alloy wire. The main catheter 1 is made by spiral winding, and the metal material can make the spiral skeleton 11 have a certain connection strength.

[0046] In another embodiment provided by the present invention, the main catheter 1 is a round wire, and the diameter of the round wire is in the range of 0.03-0.5 mm. Round wires within this diameter range are more easily deformed.

[0047] In another embodiment provided by the present invention, the main catheter 1 is a flat wire, the cross-sectional length of the flat wire is 0.1-0.7 mm, and the height is 0.01-0.3 mm. The flat wire within this size range has greater strength.

[0048] In another embodiment provided by the present invention, the spiral skeleton 11 is divided into a distal soft segment and a proximal hard segment. The hardness of the distal soft segment is less than that of the proximal hard segment. The spacing of the spiral coils of the distal soft segment is 0.05-3mm, which is the size range requirement of the liquid inlet and outlet gaps. Within this range, it is not easy to damage the lung tissue when the liquid is discharged and a certain flow rate can be guaranteed for irrigation. The length of the distal soft segment of the spiral skeleton 11 is 5-60mm, and this size range fits the size of most lung bronchi. The proximal hard segment wire spacing is 0-3mm, and the proximal hard segment wire spacing can ensure the proximal strength within this range; the distal soft segment is a section that extends into the lungs and performs liquid injection or liquid aspiration operations. It is relatively soft and will not directly exert direct pressure on the lung tissue; the proximal hard segment is a section close to the water injection and aspiration device, which maintains a certain hardness to ensure the transmission of pressure.

[0049] In another embodiment provided by the present invention, the distal end of the spiral skeleton 11 is a conical structure. In this way, while the spiral structure can ensure the connection strength of the spiral skeleton 11, the distal end of the spiral skeleton 11 can be further made softer and less likely to damage lung tissue. Moreover, the conical structure is also convenient for extending into the lung bronchi with smaller diameters.

[0050] In a preferred embodiment, the spiral skeleton 11 is a conical structure as a whole, and the diameter of the spiral skeleton 11 gradually decreases. When the irrigation fluid with the same flow rate is introduced, the flow rate of the irrigation fluid flowing out of the distal soft segment of the spiral skeleton 11 is faster than the normal flow rate, thereby improving the irrigation effect.

[0051] In another embodiment provided by the present invention, a plurality of marks 121 are provided at the distal end of the outer skin 12, which are used to distinguish the distal and proximal ends of the spiral skeleton 11. At the same time, the length of the distal end of the spiral skeleton 11 penetrating into the bronchus can be observed in real time to prevent discomfort and harm to the patient; the outer skin 12 of the main catheter is made of a polymer material such as Pebaxa, nylon, polyethylene, polypropylene, or polyvinyl chloride, and its wall thickness is 0.01-0.2 mm.

[0052] Optionally, the distal outer skin 12 of the main catheter 1 is 1-30 mm shorter than the spiral skeleton 11, that is, the spiral skeleton 11 is exposed 1-30 mm from the polymer outer skin, and the wire spacing of the exposed part of the distal spiral skeleton 11 is 0.05-3 mm.

[0053] In another embodiment provided by the present invention, an inner tube 13 is further provided inside the main catheter 1, and the inner tube 13 is used to inject irrigation fluid. An injection cavity is formed inside the inner tube 13 for injecting irrigation fluid, and a suction cavity is formed inside the main catheter 1 for recovering irrigation fluid.

[0054] In another embodiment provided by the present invention, a Luer connector is provided at the proximal end of the main catheter 1. The Luer connector is a standardized micro-impermeable connector widely used in medical and laboratory instruments, and is used to connect the water injection and suction device and the main catheter 1.

[0055] In a further embodiment, in this embodiment, the spiral skeleton 11 can discharge liquid to irrigate the lung tissue, and can also take in liquid to recover the irrigating fluid; when irrigating the lungs, the effusion, secretions or other necrotic tissue in the lungs (collectively referred to as sediments here) will be washed out to separate them from the lungs. In the process of aspirating liquid, the washed sediment needs to enter the main catheter 1 through the inlet and outlet gaps. When the sediment passes through the inlet and outlet gaps, the sediment will be stuck in the inlet and outlet gaps, which will lead to a decrease in the aspiration efficiency and an increase in the residual sediment. For this reason, a further solution is provided in this embodiment. A spiral liquid tube 14 is provided in the main catheter 1. The spiral liquid tube 14 is also a spiral The spiral liquid tube 14 is made of wire material, the length of the spiral liquid tube 14 is the same as the length of the spiral skeleton 11, and the spiral liquid tube 14 is divided into a mounting section 141 near the proximal end and a movable section 142 located at the distal end, the mounting section 141 corresponds to the proximal end on the main catheter 1 and is the same length, the movable section 142 corresponds to the distal end on the main catheter 1 and is the same length, the movable section 142 is provided with a spiral liquid port, the spiral liquid port corresponds to the liquid inlet and outlet gap, so that the pressure when the main catheter 1 aspirates liquid can still be evenly distributed and small, there is a spacing between the spiral liquid tube 14 and the spiral skeleton 11, but the spacing is small, the purpose of the spacing is to enable the spiral skeleton 11 and the spiral liquid tube 14 to be deformed separately, if the inner of the spiral skeleton 11 The wall and the outer wall of the spiral liquid tube 14 are fitted together. When the spiral skeleton 11 is deformed, the spiral liquid tube 14 needs to be deformed at the same time. When it contacts the lung tissue, the force driving the spiral skeleton 11 to deform will also increase. The space formed by the spacing is cylindrical. The space formed by the spacing is the first inlet and outlet liquid channel 144. The spiral liquid tube 14 is the second inlet and outlet liquid channel 145. When absorbing liquid, part of the lavage liquid is recovered from the first inlet and outlet liquid channel 144 to the water injection and suction device, and part of the lavage liquid passes through the first inlet and outlet liquid channel 144 and is recovered from the second inlet and outlet liquid channel 145 to the water injection and suction device. In this way, sediment can also be recovered smoothly through the first inlet and outlet liquid channel 144 and the second inlet and outlet liquid channel 145; the spiral liquid tube 14 The mounting section 141 is also connected to the water injection and suction device. Preferably, the spiral liquid tube 14 and the spiral skeleton 11 have the same center. It is particularly important to note that the elastic coefficient of the spiral liquid tube 14 is greater than the elastic coefficient of the spiral skeleton 11. That is, when subjected to the same pressure, the spiral skeleton 11 is more easily deformed than the spiral liquid tube 14. When sediment is stuck in a certain inlet and outlet gap on the spiral skeleton 11, since the negative pressure in the main conduit 1 remains unchanged, the negative pressure on the inlet and outlet gaps at other locations will increase accordingly, thereby reducing the size of the inlet and outlet gaps at various locations, that is, reducing the spacing between the spiral turns. In this way, the spiral skeleton 11 contracts accordingly, and the sediment can be initially squeezed out.Because the spiral liquid port corresponds to the inlet and outlet gap, it follows that the spiral liquid tube 14 will also contract accordingly. Furthermore, because the spiral skeleton 11 is more easily deformed than the spiral liquid tube 14, when both contract, the spiral skeleton 11 contracts more than the spiral liquid tube 14, generating relative motion between the two. This allows the pulsating flow of the irrigation fluid to be adjusted, allowing the spiral turns of the spiral liquid tube 14 to contact and scrape away any sediment trapped in the inlet and outlet gap. Consequently, as the spiral skeleton 11 moves the trapped sediment, relative motion also occurs between the sediment and the spiral liquid tube 14, further scraping and cleaning the sediment through the spiral liquid tube 14.

[0056] In another further embodiment, the main conduit 1 is provided with a secondary conduit 15, which is a deformable tube. The secondary conduit 15 is also connected to the water injection and suction device. The distal end of the secondary conduit 15 is in a closed state. The secondary conduit 15 is provided with multiple groups of one-way flow components 16, each group of the one-way flow components 16 is corresponding to the liquid inlet and outlet gaps, and each group of the one-way flow components 16 includes multiple one-way flow components 16, preferably two, and each of the one-way flow components 16 includes a connecting channel 161 for communication provided on the wall of the secondary conduit 15, one of which is provided on the inner wall of the connecting channel 161 near the proximal end of the main conduit 1 A first movable piece 162 is connected to one end of the connecting channel 161, and a second movable piece 163 is connected to another end of the inner wall of the connecting channel 161 near the proximal end of the main conduit 1. The first movable piece 162 and the second movable piece 163 can be directly integrated into the sheet material on the secondary conduit 15, and the ends of the secondary conduit 15 are softer or thinner so as to be rotatable. The first movable piece 162 and the second movable piece 163 can completely cover the connecting channel 161, and the first movable piece 162 and the second movable piece 163 can rotate around the connection position with the connecting channel 161. A raised stopper 164 is formed on the inner wall of the connecting channel 161 of the secondary conduit 15. The stopper 164 is used to prevent the first movable piece 162 and the second movable piece 163 from continuing to move into the auxiliary conduit 15. Therefore, during normal irrigation, the movable ends of the first movable piece 162 and the second movable piece 163 can only move in the direction away from the auxiliary conduit 15, so that the movable ends of the first movable piece 162 and the second movable piece 163 can and can only rotate into the liquid inlet and outlet gap; in a more preferred embodiment, the first movable piece 162 and the second movable piece 163 do not overlap in any radial section passing through the main conduit 1, that is, in the axial direction of the main conduit 1, the first movable pieces 162 and the second movable pieces 163 are staggered. This is done to prevent the outer wall of the main catheter 1 in the same radial direction from contacting the first movable piece 162 and the second movable piece 163 at the same time. During normal irrigation, irrigation fluid is injected into the main catheter 1 through the water injection and suction device. The irrigation fluid simultaneously enters the auxiliary catheter 15. The irrigation fluid in the auxiliary catheter 15 dislodges the first movable piece 162 and the second movable piece 163 and then flows out through the inlet and outlet gap to irrigate the lung tissue. When the irrigation fluid is recovered, the first movable piece 162 and the second movable piece 163 abut against the stopper 164 to seal the connecting channel 161. The irrigation fluid flows into the inlet and outlet gap and flows back to the water injection and suction device from the gap between the auxiliary catheter 15 and the main catheter 1.When recovering the irrigation fluid, if one or more of the inlet and outlet gaps are blocked, the average amount of irrigation fluid recovered will be significantly reduced and the main catheter 1 will shrink and shorten due to its elasticity. At this time, irrigation fluid is re-injected into the main catheter 1 and the auxiliary catheter 15. The irrigation fluid flowing out of the auxiliary catheter 15 will flush the first movable piece 162 and the second movable piece 163 apart, and move its movable end into the inlet and outlet gap, initially pushing out the sediment on the main catheter 1. If there is still sediment, the amount of fluid discharged from the remaining inlet and outlet gaps without sediment will increase, causing the pressure on them to increase, thereby increasing the inlet and outlet gaps and stretching the main catheter 1 (the extension distance of the main catheter 1 can be set in advance to reserve a safe extension distance, and the safe extension distance can be adjusted based on the mark 121 on the outer skin 12). At this time, the main catheter 1 is extended and moves relative to the auxiliary catheter 15. Because the main catheter 1 cannot contact both the first movable piece 162 and the second movable piece 163 simultaneously, when the main catheter 1 extends and first contacts the first movable piece 162, the wall of the main catheter 1 is pushed away from the second movable piece 163. When the main catheter 1 continues to extend and contacts the second movable piece 163, the wall of the main catheter 1 is also pushed away from the first movable piece 162. In this way, the main catheter 1 continuously contacts the first and second movable pieces 162 and 163 as it extends, causing the main catheter 1 as a whole to perform reciprocating undulating motion in different directions, making it easier to remove deposits on the main catheter 1. As described above, by adjusting the irrigation fluid speed in a pulsed manner and repeating the irrigation and suction operations, the spiral skeleton of the main catheter 1 can be caused to undulate in a wave-like manner, achieving complete removal of blockages.

[0057] In order to ensure that the lavage fluid output from the inlet and outlet gap has a certain lavage force, that is, a certain speed during lavage, there are size requirements for the inlet and outlet gap during lavage, and the inlet and outlet gap should not be too large. However, when recovering the lavage fluid, since negative pressure is introduced into the main catheter 1, the spiral skeleton 11 is very likely to apply a certain negative pressure to the lung tissue, thereby causing damage to the lung tissue. That is, when recovering the lavage fluid, there are also size requirements for the inlet and outlet gap, and the inlet and outlet gap should not be too small. For this reason, in this embodiment, a further improvement plan is proposed to solve the above technical problems. The auxiliary catheter 15 is provided with a variable The deformed segment 17 is cylindrical and has a diameter smaller than that of the auxiliary conduit 15. The deformed segment 17 is provided with a plurality of annular deformable protrusions 171. A liquid-passing cylinder 172 is also fixed in the auxiliary conduit 15. The outer wall of the liquid-passing cylinder 172 is attached to the inner wall of the deformed segment 17. The liquid-passing cylinder 172 is also provided with a plurality of communicating holes 173. The communicating holes 173 are arranged corresponding to the annular deformable protrusions 171. In this embodiment, the distal end of the auxiliary conduit 15 and the distal end of the main conduit 1 are fixedly connected together by a fixing portion 174. When irrigation is performed normally, the main conduit 1 and the auxiliary conduit are filled with water through the water-injection device. 15 is injected with irrigating fluid, and the irrigating fluid in the auxiliary conduit 15 flushes the first movable piece 162 and the second movable piece 163 and then flows out through the inlet and outlet gap to irrigate the lung tissue. At this time, due to the movement of the first movable piece 162 and the second movable piece 163, the auxiliary conduit 15 is in a connected state. Therefore, the annular deformed protrusion 171 is under less pressure and does not deform. When the irrigating fluid is recovered, the auxiliary conduit 15 is in a negative pressure state, and the first movable piece 162 and the second movable piece 163 are tightly attached to the stopper 164 to seal the connecting channel 161. At this time, the auxiliary conduit 15 is in a sealed state, and the annular deformed protrusion 171 is in a small pressure state. The deformed protrusion 171 is subjected to the negative pressure transmitted from the connecting hole 173 and deformed to fit the outer wall of the liquid-passing tube 172. In this way, the length of the deformed section 17 is extended. In this way, the auxiliary conduit 15 is extended and drives the fixed part 174 to move, so that the main conduit 1 is extended synchronously, and the inlet and outlet liquid gap is also enlarged at this time. In this way, three effects can be achieved. First, the inlet and outlet liquid gap is increased during the liquid aspiration process, and the negative pressure is reduced, thereby further protecting the lung tissue. Second, the spiral skeleton 11 can be extended during liquid aspiration, and more irrigation fluid can be inhaled, thereby increasing the recovery efficiency. Third, the increase in the inlet and outlet liquid gap can also prevent sediment from being stuck.

[0058] The above description is merely illustrative of certain exemplary embodiments of the present invention. It goes without saying that those skilled in the art will be able to modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and description are illustrative in nature and should not be construed as limiting the scope of protection of the claims.

Claims

1. A novel irrigation catheter, characterized in that: including a main body catheter for passing through a bronchoscope; The main catheter comprises a spiral skeleton for releasing and recovering irrigation fluid, and also comprises an outer skin fixedly connected to the outer peripheral surface of the proximal end of the spiral skeleton. The proximal end of the spiral skeleton is used to connect a water injection and suction device.

2. The novel irrigation catheter according to claim 1, characterized in that: The main body conduit is provided with an injection and aspiration channel group for injecting and aspirating liquid, and the injection and aspiration channel group includes at least one channel.

3. The novel irrigation catheter according to claim 1, characterized in that: The material of the spiral skeleton of the main catheter is one or more of stainless steel wire, nickel-titanium alloy wire and cobalt-based alloy wire, and the main catheter is made by spiral winding.

4. The novel irrigation catheter according to claim 3, characterized in that: The spiral skeleton is a round wire, and the diameter of the round wire is 0.03-0.5 mm.

5. The novel irrigation catheter according to claim 3, characterized in that: The spiral skeleton is a flat wire, and the cross-sectional length of the flat wire is 0.1-0.7 mm and the height is 0.01-0.3 mm.

6. The novel irrigation catheter according to claim 1, characterized in that: The spiral skeleton is divided into a distal soft segment and a proximal hard segment. The spacing of the metal wires of the distal soft segment is 0.05-3mm. The length of the distal soft segment of the spiral skeleton is 5-60mm, and the spacing of the wires of the proximal hard segment is 0-3mm.

7. The novel irrigation catheter according to claim 1, characterized in that: The distal end of the spiral skeleton is a cone-shaped structure.

8. The novel irrigation catheter according to claim 2, characterized in that: A plurality of markings are arranged at the distal end of the outer skin.

9. The novel irrigation catheter according to claim 1, characterized in that: An inner tube is also sleeved in the main body conduit.

10. The novel irrigation catheter according to claim 1, characterized in that: A Luer connector is disposed at the proximal end of the main catheter.

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