New irrigation catheter

Abstract

The present invention discloses a novel irrigation catheter, which comprises a main body catheter for passing through a bronchoscope; the main body 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 present invention provides a novel irrigation catheter, which comprises a main body catheter for passing through a bronchoscope, which is formed by connecting a metal spring skeleton and an outer skin, and the metal spring skeleton can ensure that under the condition of the same outer diameter, the inner diameter of the main body catheter is larger than the inner diameter of a catheter made of a pure plastic tube, thereby improving the efficiency during suction and avoiding collapse.

Description

Technical Field

[0001] The invention relates to alveolar lavage technology, and in particular to a novel lavage catheter. Background Art

[0002] Bronchoalveolar lavage is a non-invasive operation technique performed through a bronchoscope and has been widely accepted in disease diagnosis. By injecting a sufficient amount of lavage fluid into the alveoli and fully aspirating it, the following important information is obtained from the bronchoalveolar lavage fluid at the alveolar level, such as immune cells, inflammatory cells, cytology and infectious microbial pathogenic information, to assist in the diagnosis, condition observation and prognosis of respiratory diseases. Most of the lavage devices in the prior art use bronchoscopes for direct lavage. Because the diameter of the bronchoscope is too thick, it is difficult to insert deeply to reach the target lesion area, so there are problems such as too large lavage range and contamination of lavage fluid, which makes diagnosis difficult. When a catheter with a thinner diameter is used for deep insertion and lavage in the bronchus, the slender branch trachea is prone to collapse under suction negative pressure conditions due to the lack of cartilage support, and the opening of the catheter for water outlet is blocked. Although precise alveolar lavage has more expected clinical benefits, it has not been developed due to the lack of corresponding instruments and application difficulties. The present invention provides a catheter for precise 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, including 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 channel group for injecting or absorbing water, the water injection and suction channel group includes at least one channel, and each channel extends into the head, and the head has an opening connected to each channel; wherein, the length of the main catheter is 80-150 cm, and the cross-sectional area of ​​each channel in the water injection and suction channel group is 0.5-6.2 square millimeters, and the length of the main catheter is positively correlated with the area of ​​the cross-sectional area of ​​the channel.

[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 the catheter made of pure plastic tube is relatively thin, and the efficiency during suction is also lower. Summary of the invention

[0005] The object 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.

[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 above-mentioned 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 above-mentioned 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] In the above-mentioned novel irrigation catheter, 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.

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

[0014] The novel irrigation catheter described above has a plurality of markings disposed at the distal end of the outer sheath.

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

[0016] The novel irrigation catheter described above has a Luer connector disposed at the proximal end of the main catheter.

[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. Through the metal spring frame, it can be ensured that under the same outer diameter, the inner diameter of the main catheter is larger than the inner diameter of the catheter made of a pure plastic tube, 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 drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present invention. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.

[0019] Figure 1 A schematic structural diagram of a novel irrigation catheter provided in one embodiment of the present invention.

[0020] Figure 2 A schematic structural diagram of a spiral skeleton provided for an embodiment of the present invention.

[0021] Figure 3 A schematic structural diagram of a spiral skeleton provided in another embodiment of the present invention.

[0022] Figure 4 A schematic structural diagram of a spiral skeleton provided in yet another embodiment of the present invention.

[0023] Figure 5 A schematic diagram of liquid inlet into a novel irrigation catheter provided in one embodiment of the present invention.

[0024] Figure 6 This is a schematic structural diagram of a main catheter provided in yet another embodiment of the present invention.

[0025] Figure 7 For the present invention Figure 6 A partial diagram of .

[0026] Figure 8 A cross-sectional view of a spiral skeleton and an inner tube provided in yet another embodiment of the present invention.

[0027] Fig. 9 A cross-sectional view of a spiral skeleton and a spiral liquid tube provided in another embodiment of the present invention.

[0028] Fig.10 A cross-sectional view of a novel irrigation catheter provided in accordance with yet another embodiment of the present invention.

[0029] Fig.11 A cross-sectional view of a novel irrigation catheter provided in yet another embodiment of the present invention during irrigation.

[0030] Fig.12 For the present invention Fig.11 A local enlarged view of point X.

[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. Active section; 144. First inlet and outlet liquid channel; 145. Second inlet and outlet liquid channel; 15. Auxiliary conduit; 16. One-way flow component; 161. Connecting channel; 162. First active sheet; 163. Second active sheet; 164. Stopper; 17. Deformation section; 171. Annular deformation protrusion; 172. Liquid passing cylinder; 173. Connecting hole; 174. Fixed connection part. DETAILED DESCRIPTION

[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 is away from the doctor and first enters the patient's body.

[0035] like Figure 1-12 As shown, an embodiment of the present invention provides a novel 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 circumference of the spiral skeleton 11.

[0036] Specifically in this embodiment, the main body catheter 1 is divided into a distal end and a proximal end. The distal end is the head formed by the main body catheter 1 for extending into the pulmonary bronchus, and the proximal end is the head formed by the main body catheter 1 for probing out the bronchoscope. The proximal end is connected to a water injection and suction device. The water injection and suction device is a prior art, which is used to inject lavage fluid into the main body catheter 1 and recover the lavage fluid. The water injection and suction device is widely used in alveolar lavage and will not be described in detail here. The shape of the spiral skeleton 11 is similar to a spring structure, including multiple spiral coil structures, preferably with elasticity, but it may not be. In order to ensure that the lavage fluid can be recovered smoothly, there is a gap between each spiral coil at the distal end of the spiral skeleton 11, that is, the distal end of the spiral skeleton 11 is provided with a distal hole of the spiral skeleton 11 (hereinafter collectively referred to as the inlet and outlet gap). 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 made of the spiral skeleton 11 is preferably a metal material, which can ensure a certain connection strength of the spiral skeleton 11. 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 water injection and suction channel group and cleans the patient's lungs. The water injection and suction device can also control the liquid inlet rate and liquid suction rate of the irrigation fluid. When the irrigation is completed, the water injection and suction device sucks out the irrigation fluid in the patient's lungs. At this time, the irrigation fluid is recovered through the inlet and outlet gaps of the spiral skeleton 11 and enters the water injection and suction channel group.

[0037] The function of the outer skin 12 is to prevent liquid from leaking out 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.

[0038] In addition, the present invention also provides another embodiment of the outer skin 12, wherein the outer skin 12 is sleeved on the proximal end of the main catheter 11, and 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, and 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 withdrawn 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 provided 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 the main catheter 1 provided with the spiral skeleton 11 is used for suction, the bleeding rate is less than 5%, eliminating the damage to the lung tissue during suction. At the same time, the main catheter 1 provided with the spiral skeleton 11 has a minimum turning diameter of 10 mm, which is softer and can better protect the lung tissue.

[0040] In the prior art, when the plastic tube is inserted into the patient's lungs, the injection or suction operation is performed through the side holes and the top hole. When negative pressure occurs in the plastic tube, that is, when the suction operation is performed through the side holes, the side holes are very likely to be directly adsorbed on the lung tissue. When the pressure is too high, the lung tissue will bleed. In this embodiment, since the inlet and outlet gaps are evenly distributed and the size of the inlet and outlet ports of the inlet and outlet gaps is significantly larger than the size of the side holes, the lavage fluid can flow out or flow in from multiple parts when it flows in or out of the inlet and outlet gaps, and the pressure distribution is even and smaller, which is not easy to cause bleeding of the lung tissue. Moreover, the same effect as the large-scale lavage of the plastic tube can be achieved by a small amount of lavage. In addition, the lavage fluid can also be sucked from multiple larger parts, and the lavage fluid recovery efficiency is higher, and the lavage fluid residue is less. It can be imagined that the function achieved by the above-mentioned spiral skeleton 11 can also be achieved by increasing the size of the side holes of the plastic tube. However, if the size of the side holes of the plastic tube is increased, it is not easy to maintain the tubular shape at the end of the plastic tube extending into the lungs under negative pressure, which will affect the recovery of the lavage 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 it is softer. The minimum turning diameter of the spiral skeleton 11 is 10mm, which is significantly reduced compared to the minimum turning diameter of 55mm 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 blocked, especially when sucking the irrigation fluid. Even if the pressure is increased, the folded part of the plastic tube cannot be cleared, and the folded part of the plastic tube will further collapse. However, the spiral skeleton 11 will not fold when working, and can ensure the smooth flow of the irrigation fluid.

[0043] In another embodiment provided by the present invention, the main body catheter 1 has a water injection and suction channel group for injecting water (irrigation fluid) and absorbing water, and the water injection and suction channel group includes at least one channel, and the irrigation fluid flows out of or into the lung tissue through the water injection and suction 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 turns of the distal soft segment is 0.05-3mm, which is the size range requirement of the 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 within this range can ensure the strength of the proximal end; the distal soft segment is a segment that extends into the lungs and performs liquid injection or liquid aspiration operations, which is relatively soft and will not directly exert direct pressure on the lung tissue; the proximal hard segment is a segment 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 lung bronchus with a smaller diameter.

[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 end and the proximal end 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 material of the main catheter outer skin 12 is a polymer material such as Pebaxa or nylon or polyethylene or polypropylene or polyvinyl chloride, and its wall thickness is 0.01-0.2mm.

[0052] Optionally, the outer skin 12 at the distal end 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 sleeved in the main catheter 1, and the inner tube 13 is used to inject irrigation fluid. An injection cavity is formed in the inner tube 13 for injecting irrigation fluid, and a suction cavity is formed in 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 both discharge liquid to irrigate the lung tissue and 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. During the aspiration process, the washed sediments need to enter the main catheter 1 through the inlet and outlet gaps. When the sediments pass through the inlet and outlet gaps, the sediments 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 sediments. For this reason, a further scheme is provided in this embodiment, in which a spiral liquid tube 14 is provided inside the main catheter 1, and 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 close to 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 has the same length, the movable section 142 corresponds to the distal end on the main catheter 1 and has the same length, and there is a spiral liquid port on the movable section 142, and the spiral liquid port corresponds to the liquid inlet and outlet gap, so that the pressure of the main catheter 1 when aspirating 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, and 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 part 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 irrigation liquid is recovered from the first inlet and outlet liquid channel 144 to the water injection and absorption device, and part of the irrigation 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 absorption device. In this way, the 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 has the same center as the spiral skeleton 11. It should be noted 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 the sediment is stuck in a certain inlet and outlet gap of 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, so that the spiral skeleton 11 shrinks accordingly, and the sediment can be initially squeezed out;Since the spiral liquid port corresponds to the inlet and outlet gap, it is known that the spiral liquid tube 14 will also shrink accordingly. Since the spiral skeleton 11 is more easily deformed than the spiral liquid tube 14, when both shrink, the shrinkage amplitude of the spiral skeleton 11 is greater than that of the spiral liquid tube 14, and relative movement occurs between the two. In this way, by adjusting the irrigation liquid speed in a pulsed manner, the spiral coil on the spiral liquid tube 14 can contact and scrape off the sediment stuck in the inlet and outlet gap. Therefore, when the spiral skeleton 11 drives the stuck sediment to move, the sediment and the spiral liquid tube 14 also move relative to each other, and the spiral liquid tube 14 further scrapes and cleans the sediment. ;

[0056] In another further embodiment, the main conduit 1 is provided with a secondary conduit 15, the secondary conduit 15 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, and a plurality of groups of one-way flow components 16 are provided on the secondary conduit 15, each group of the one-way flow components 16 is arranged corresponding to the liquid inlet and outlet gaps, each group of the one-way flow components 16 includes a plurality of the one-way flow components 16, preferably two, each of the one-way flow components 16 includes a connecting channel 161 for communication, which is provided on the wall of the secondary conduit 15, and one of the connecting channels 161 is provided on the inner wall near the proximal end of the main conduit 1 A first movable piece 162 is connected to one place of the connecting channel 161, and a second movable piece 163 is connected to another place on 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 end of the secondary conduit 15 is 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 protruding stopper 164 is formed on the inner wall of the connecting channel 161 on 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 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; when lavage is normally performed, lavage liquid is injected into the main catheter 1 through the water injection and suction device, and the lavage liquid simultaneously enters the auxiliary catheter 15, and the lavage liquid in the auxiliary catheter 15 flushes the first movable piece 162 and the second movable piece 163 and then flows out through the inlet and outlet gap to lavage the lung tissue; when the lavage liquid is recovered, the first movable piece 162 and the second movable piece 163 are pressed against the stopper 164 to seal the connecting channel 161, and the lavage liquid flows in through 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, the irrigation fluid is re-injected into the main catheter 1 and the auxiliary catheter 15, and 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 lengthening 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 the first movable piece 162 and the second movable piece 163 at the same time, when the main catheter 1 is extended and contacts the first movable piece 162 first, the wall of the main catheter 1 is pushed to move to the side 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 pushed to move to the side away from the first movable piece 162. In this way, when the main catheter 1 is extended, it keeps contacting the first movable piece 162 and the second movable piece 163, so that the main catheter 1 as a whole can perform reciprocating wave movement in different directions, making it easier to make the sediment on the main catheter 1 fall off. As mentioned above, at this time, by adjusting the irrigation fluid speed in a pulsed manner and repeatedly irrigating and sucking operations, the spiral skeleton of the main catheter 1 can be made to reciprocate in a wave-like manner, so as to completely remove the blockage. ;

[0057] In order to ensure that the lavage fluid output from the inlet and outlet gap has a certain lavage force during lavage, that is, a certain speed, 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 scheme is proposed to solve the above technical problems. The auxiliary catheter 15 is provided with a variable The deformation section 17 is cylindrical and has a diameter smaller than that of the secondary conduit 15. The deformation section 17 is provided with a plurality of annular deformation protrusions 171. A liquid-passing cylinder 172 is fixedly provided in the secondary conduit 15. The outer wall of the liquid-passing cylinder 172 is attached to the inner wall of the deformation section 17. The liquid-passing cylinder 172 is provided with a plurality of communication holes 173. The communication holes 173 and the annular deformation protrusions 171 are arranged corresponding to each other. In this embodiment, the distal end of the secondary 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, water is injected into the main conduit 1 and the secondary conduit through the water injection and suction device. The irrigation liquid is injected into the auxiliary conduit 15, and the irrigation liquid 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, the auxiliary conduit 15 is in a connected state due to the movement of the first movable piece 162 and the second movable piece 163. Therefore, the annular deformable protrusion 171 is under less pressure and does not deform. When the irrigation liquid 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 deformable protrusion 171 is in a negative 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, so that the length of the deformed section 17 is extended, and 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 the liquid aspiration, and more irrigation fluid can be inhaled, and the recovery efficiency is increased. Third, the increase in the inlet and outlet liquid gap can also prevent the sediment from being stuck.

[0058] The above description is only by way of illustration of certain exemplary embodiments of the present invention. It is undoubted that those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A novel irrigation catheter, characterized in that: including a main body catheter for passing through a bronchoscope; The main catheter includes a spiral skeleton for releasing and recovering lavage fluid, and also includes an outer skin, the function of the outer skin is to prevent the fluid from leaking from the proximal end of the main catheter during injection or aspiration, and then leaking into the bronchoscope, the outer skin is fixedly connected to the outer peripheral surface of the proximal end of the spiral skeleton, the outer skin is made of plastic, the outer skin at the distal end of the main catheter is 1-30mm shorter than the spiral skeleton, and the wire spacing of the exposed part of the spiral skeleton at the distal end is 0.05-3mm; The proximal end is formed by the main catheter and is used to extend the head of the bronchoscope, and the proximal end is connected to a water injection and suction device; A spiral liquid tube is sleeved inside the main catheter, and the spiral liquid tube is also made of spiral wire. The length of the spiral liquid tube is the same as that of the spiral skeleton, and the spiral liquid tube is divided into an installation section close to the proximal end and an active section located at the distal end. The installation section corresponds to the proximal end on the main catheter and has the same length, and the active section corresponds to the distal end on the main catheter and has the same length. There is a spiral liquid port on the active section, and the spiral liquid port corresponds to the liquid inlet and outlet gap. There is a spacing between the spiral liquid tube and the spiral skeleton. The purpose of the spacing is to enable the spiral skeleton and the spiral liquid tube to be deformed separately. The space formed by the spacing is cylindrical, and the space formed by the spacing is the first liquid inlet and outlet channel. The spiral liquid tube is the second liquid inlet and outlet channel. The installation section of the spiral liquid tube is connected to the water injection and suction device, and the elastic coefficient of the spiral liquid tube is greater than the elastic coefficient of the spiral skeleton.

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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