Indwelling catheter for lacrimal passage

Abstract

The invention relates to the field of indwelling tubes, and discloses an indwelling tube for a lacrimal passage, which comprises a main tube, a corrugated tube I, a micro-column and a corrugated tube II, the liquid inlet end of the main pipe is communicated with the corrugated pipe I, and the liquid outlet end is communicated with the corrugated pipe II; a first spiral flow guide groove and a second spiral flow guide groove are formed in the first corrugated pipe and the second corrugated pipe respectively. The water micro-column is arranged at the liquid inlet end of the first corrugated pipe so as to drain tears into the first spiral flow guide groove. When blinking extrusion action is applied to the first corrugated pipe and the second corrugated pipe, the corrugated structures of the first corrugated pipe and the second corrugated pipe expand in the radial direction, the first corrugated pipe is tightly attached to the lacrimal punctum, the second corrugated pipe and the inner wall of the lacrimal canaliculus are anchored in a friction mode, and meanwhile the first corrugated pipe is shortened and deformed due to longitudinal pressure. Blockage is reduced through negative pressure of the spiral flow guide groove and the first corrugated pipe, and it is ensured that tear drainage is continuous; the blink extrusion is matched with the spiral diversion trench to improve drainage efficiency and relieve epiphora; the corrugated pipe and the lacrimal passage are attached and anchored, stability is enhanced, and the displacement risk is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of indwelling catheters, and more specifically, it relates to an indwelling catheter for the lacrimal passage. Background Art

[0002] The lacrimal passage includes lacrimal puncta, lacrimal ducts, lacrimal sacs, and nasolacrimal ducts. There is one upper and one lower lacrimal punctum, located on the papillary eminence at the medial end of the eyelid margin. The upper lacrimal punctum is slightly more medial in position than the lower lacrimal punctum. Displacement of the lacrimal punctum often causes epiphora. The lacrimal ducts are small tubes connecting the lacrimal puncta and the lacrimal sacs, divided into the upper lacrimal duct and the lower lacrimal duct. The lateral part of each lacrimal duct is first perpendicular to the eyelid margin and then turns inward at nearly a right angle. The two lacrimal ducts converge into the common lacrimal duct and then open into the upper part of the lacrimal sac. The lacrimal sac is a membranous sac located in the lacrimal fossa in the anterior lower part of the medial wall of the orbit. The upper end of the lacrimal sac closes into a blind end, about 3 - 5 mm above the medial canthus. The lower end transitions into the nasolacrimal duct. The lacrimal sac is about 1.2 cm long and 0.4 - 0.7 cm wide. The muscle fibers of the orbicularis oculi surround the lacrimal ducts and can contract and expand the lacrimal sac to promote the drainage of tears. The nasolacrimal duct is a membranous tube connecting the lower end of the lacrimal sac. The upper part is embedded in the bony lumen, and the lower part gradually tapers and enters the mucosa of the lateral wall of the nose, opening into the lateral wall of the inferior meatus. Tears flow into the nasal cavity through the upper and lower lacrimal puncta, lacrimal ducts, common lacrimal duct, lacrimal sac, and nasolacrimal duct. If any part of this lacrimal passage becomes blocked due to a lesion, a series of symptoms such as epiphora and purulent discharge will occur. The lacrimal passage intubation surgery is the least invasive surgical type in the treatment of lacrimal passage shaping for diseases such as lacrimal passage obstruction, chronic dacryocystitis, and lacrimal passage trauma.

[0003] For common existing blockages of the lacrimal ducts, the tear duct is usually directly placed in the lacrimal duct passage. However, components in tears (such as proteins, cell debris, lipids, etc.) may cause blockage of the tear duct orifice (lacrimal punctum). This situation is relatively common clinically, especially in certain pathological conditions, such as dry eye, chronic conjunctivitis, dacryocystitis, etc. If the tear duct orifice becomes blocked, it will affect the continuity of the indwelling catheter in guiding the flow of tears. Summary of the Invention

[0004] The present invention provides an indwelling catheter for the lacrimal passage to solve the technical problem of blockage in the related art.

[0005] The present invention provides an indwelling catheter for the lacrimal passage, including a main tube, a first corrugated tube, a microcolumn, and a second corrugated tube; The liquid inlet end of the main tube is communicated with the first corrugated tube, and the liquid discharge end is communicated with the second corrugated tube; Spiral diversion grooves one and two are respectively arranged inside the first corrugated tube and the second corrugated tube; The water microcolumn is arranged at the liquid inlet end of the first corrugated tube to divert tears into the spiral diversion groove one; When a blinking squeezing action is applied to the first corrugated pipe and the second corrugated pipe, the corrugated structures of the first corrugated pipe and the second corrugated pipe expand radially. The first corrugated pipe closely adheres to the lacrimal punctum, and the second corrugated pipe frictionally anchors to the inner wall of the lacrimal duct. At the same time, the first corrugated pipe shortens and deforms due to the longitudinal pressure, generating an axial thrust towards the lacrimal sac direction, driving the tear fluid to flow directionally along the first corrugated pipe, and the second corrugated pipe discharges the tear fluid through deformation.

[0006] As a further optimized solution of the present invention, a braided net is embedded inside the main pipe, the first corrugated pipe and the second corrugated pipe, and the braided net is a nickel-titanium alloy wire braided net.

[0007] As a further optimized solution of the present invention, both the first corrugated pipe and the second corrugated pipe are divided into an inner layer and an outer layer. The outer layer is a silica gel layer, and the inner layer is a PTFE film layer.

[0008] As a further optimized solution of the present invention, the micro-columns are hydrophilic micro-columns and are made of polyvinyl alcohol or polyethylene glycol materials.

[0009] As a further optimized solution of the present invention, the number of the micro-columns is multiple, and one end of the multiple micro-columns located inside the first corrugated pipe is located at the first spiral diversion groove and is arranged along the path of the first spiral diversion groove.

[0010] As a further optimized solution of the present invention, a one-way valve is provided inside the second corrugated pipe, and the one-way valve discharges the tear fluid inside the main pipe unidirectionally.

[0011] As a further optimized solution of the present invention, the one-way valve is composed of multiple valve plates. The valve plates are arranged inside the second corrugated pipe and are distributed in an umbrella shape and have a taper.

[0012] As a further optimized solution of the present invention, the thickness of the valve plate gradually decreases from the connection part of the second corrugated pipe to the far side.

[0013] As a further optimized solution of the present invention, both the first spiral diversion groove and the second spiral diversion groove are arranged with the depth decreasing from deep to shallow.

[0014] As a further optimized solution of the present invention, an antibacterial layer is provided on the main pipe, the first corrugated pipe and the second corrugated pipe, and the antibacterial layer is a nano-silver antibacterial layer.

[0015] The beneficial effects of the present invention are as follows: 1. For the indwelling tube for the lacrimal passage of the present invention, the PTFE film layers on the first corrugated pipe and the second corrugated pipe reduce the attachment of tear fluid components. The shear force generated by the gradual change of the depth of the spiral diversion groove peels off the sediment, and the negative pressure generated when the first corrugated pipe contracts attracts the tear fluid to wash the micro-columns. The combined action of multiple methods reduces the possibility of blockage of this indwelling tube and ensures the continuity of tear fluid drainage.

[0016] 2. The indwelling tube for lacrimal passage of the present invention drives the flow of tears by squeezing during blinking, mimics the natural lacrimal fluid drainage mechanism of the human body, and with the arrangement of the spiral diversion groove, effectively improves the tear drainage efficiency, can timely drain the tears, and relieve the problem of epiphora caused by lacrimal passage obstruction.

[0017] 3. The indwelling tube for lacrimal passage of the present invention enhances the stability of the indwelling tube in the lacrimal passage and reduces the risk of displacement by closely fitting the corrugated pipe I with the lacrimal punctum and frictionally anchoring the corrugated pipe II with the inner wall of the lacrimal ductule, ensuring that the indwelling tube can continuously work properly. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 FIG. is a schematic diagram of the overall structure of the indwelling tube for lacrimal passage proposed by the present invention.

[0019] Figure 2 FIG. is a schematic diagram of the internal structure of the corrugated pipe in the indwelling tube for lacrimal passage proposed by the present invention.

[0020] Figure 3 FIG. is a schematic diagram of the structure of the one-way valve in the indwelling tube for lacrimal passage proposed by the present invention.

[0021] Figure 4 FIG. is a schematic diagram of the internal structure of the corrugated pipe II in the indwelling tube for lacrimal passage proposed by the present invention.

[0022] Figure 5 FIG. is a schematic diagram of the structure of the valve piece in the indwelling tube for lacrimal passage proposed by the present invention.

[0023] Figure 6 FIG. is a schematic side view structure diagram of the braided mesh in the indwelling tube for lacrimal passage proposed by the present invention.

[0024] In the figure: 1. Main tube; 2. Corrugated pipe I; 201. Spiral diversion groove I; 3. Microcolumn; 4. One-way valve; 41. Valve piece; 5. Corrugated pipe II; 501. Spiral diversion groove II; 6. Braided mesh. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0025] Now, the subject matter described herein will be discussed with reference to exemplary embodiments. It should be understood that discussing these embodiments is only to enable those skilled in the art to better understand and thus implement the subject matter described herein. Without departing from the scope of protection of the content of this specification, the functions and arrangements of the elements discussed can be changed. Each example can omit, substitute, or add various processes or components as needed. Additionally, the features described in some examples can also be combined in other examples.

[0026] As Figure 1 , Figure 2 , Figure 4 and Figure 5 shown, an indwelling tube for the lacrimal passage according to an embodiment of the present invention is characterized in that it includes a main tube 1, a first corrugated tube 2, a micro-column 3 and a second corrugated tube 5; The liquid inlet end of the main tube 1 is communicated with the first corrugated tube 2, and the liquid discharge end is communicated with the second corrugated tube 5; Spiral diversion grooves 201 and 501 are respectively arranged inside the first corrugated tube 2 and the second corrugated tube 5; The water micro-column 3 is arranged at the liquid inlet end of the first corrugated tube 2 to divert the lacrimal fluid into the spiral diversion groove 201; When a blinking squeezing action is applied to the first corrugated tube 2 and the second corrugated tube 5, the corrugated structures of the first corrugated tube 2 and the second corrugated tube 5 generate radial expansion. The first corrugated tube 2 closely adheres to the lacrimal punctum, and the second corrugated tube 5 frictionally anchors with the inner wall of the lacrimal ductule. At the same time, the first corrugated tube 2 shortens and deforms due to the longitudinal pressure, generating an axial thrust towards the lacrimal sac direction, driving the lacrimal fluid to flow directionally along the first corrugated tube 2, and the second corrugated tube 5 discharges the lacrimal fluid through deformation.

[0027] When blinking, the eyelids apply pressure to the first corrugated tube 2 and the second corrugated tube 5. The corrugated structures of the first corrugated tube 2 and the second corrugated tube 5 are elastic and radially expand after being pressed. After expansion, the first corrugated tube 2 can closely adhere to the lacrimal punctum and is fixed by friction, reducing the detachment of the indwelling tube from the lacrimal punctum. After expansion, the second corrugated tube 5 adheres to the inner wall of the lacrimal ductule to form a friction anchor to stabilize the position of the indwelling tube in the lacrimal passage. At the same time, the first corrugated tube 2 shortens under the action of the longitudinal pressure to generate an axial thrust. The micro-column 3 attracts tears by its own hydrophilicity, and the position of the spiral diversion groove 201 is lower than the position of the lacrimal fluid, diverting it to the spiral diversion groove 201. The spiral diversion groove 201 guides the flow of the lacrimal fluid. Under the action of the axial thrust, the lacrimal fluid flows along the first corrugated tube 2 towards the main tube 1 and finally reaches the second corrugated tube 5. The second corrugated tube 5 deforms under the pressure of the lacrimal fluid and discharges the lacrimal fluid, thus reducing the phenomenon of blockage.

[0028] The suction action of the first corrugated tube 2 is similar to that of a peristaltic pump, and the specific principle is as follows: Initial compression: When the upper eyelid presses down, it first contacts the liquid inlet end corrugated tube (area A) near the lacrimal punctum. The silicone corrugated tube undergoes: Radial deformation: The corrugation spacing expands, generating an anchoring force through friction; Axial contraction: The length of the corrugated tube shortens, squeezing the internal lacrimal fluid.

[0029] Pressure transmission: The compression wave propagates along the first corrugated tube 2 towards the main tube 1 direction, successively triggering the contraction of the corrugated tubes in the middle section (area B to the liquid discharge end area C), forming a "traveling compression zone" similar to a peristaltic pump.

[0030] This design enhances the stability of the indwelling tube in the lacrimal duct, reducing the risk of displacement; it drives the flow of tears through blinking extrusion, mimicking the natural tear drainage mechanism of the human body, improving the drainage efficiency, and effectively alleviating the problem of epiphora caused by lacrimal duct obstruction.

[0031] Such as Figure 6 As shown, a braided mesh 6 is embedded inside the main tube 1, the first bellows 2, and the second bellows 5. The braided mesh 6 is a nickel-titanium alloy wire braided mesh.

[0032] The nickel-titanium alloy wire braided mesh 6 has shape memory characteristics and superelasticity. When the indwelling tube is subjected to external forces, such as extrusion and bending by tissues in the lacrimal duct, the braided mesh 6 can restore or maintain its original shape by virtue of its own characteristics, thereby providing support for the indwelling tube, enhancing the structural strength of the main tube 1, the first bellows 2, and the second bellows 5, making them not easily deformed or collapsed, improving the durability of the indwelling tube, extending its service life, ensuring the patency of the indwelling tube in the complex environment of the lacrimal duct, reducing the unsmooth drainage caused by deformation, and enhancing the reliability and safety of use.

[0033] Both the first bellows 2 and the second bellows 5 are divided into an inner layer and an outer layer. The outer layer is a silicone layer, and the inner layer is a PTFE film layer.

[0034] The outer silicone layer is soft in texture and has good biocompatibility. When it comes into contact with the lacrimal duct tissue, it can reduce the irritation and friction to the tissue and lower the occurrence probability of inflammatory reactions. The inner PTFE film layer has a low surface energy, and components such as proteins and cell debris in tears are difficult to adhere to its surface, thereby effectively reducing the blockage of the lumen.

[0035] Such as Figure 2 As shown, the micro-columns 3 are hydrophilic micro-columns and are made of polyvinyl alcohol or polyethylene glycol materials.

[0036] The polyvinyl alcohol or polyethylene glycol materials are hydrophilic. Their molecular structures can form hydrogen bonds with water molecules, thereby quickly adsorbing the surrounding tears. The micro-columns 3 utilize this hydrophilicity to attract tears like a sponge and guide them to the first spiral diversion groove 201. When the micro-columns 3 are in use, they adsorb tears to the spiral diversion groove through capillary action. Since the initial depth inside the spiral diversion groove is relatively deep and lower than the height of the tears, it is conducive to guiding the tears at the eye to the bellows 2. The depth difference is used to accelerate the flow. Along with the capillary action and the suction effect of the bellows 2, the effect of sucking tears is increased, the collection efficiency of tears is improved, and even when the tear secretion volume is small, the tears can be timely and effectively introduced into this indwelling tube, enhancing the drainage function of the indwelling tube.

[0037] Furthermore, the number of the micro-columns 3 is multiple, and one end of the multiple micro-columns 3 located inside the first bellows 2 is at the first spiral diversion groove 201 and is arranged along the path of the first spiral diversion groove 201.

[0038] Multiple micro-columns 3 increase the contact area with tears, enabling a wider range and larger volume of tear collection. Arranged along the path of the spiral diversion groove 201, it can ensure that the collected tears directly and quickly enter the spiral diversion groove 201, reducing the flow resistance and residence time of tears in the tube.

[0039] When the corrugated pipe 2 contracts, a local negative pressure is generated inside the corrugated pipe 2, attracting tears to wash the micro-columns 3, which plays a role in assisting the cleaning of the micro-columns 3.

[0040] As Figure 3 shown, the drainage efficiency of the spiral diversion groove 201 is insufficient at low tear secretion levels, and high-frequency blinking may cause backflow. A one-way valve 4 is provided inside the corrugated pipe 5, and the one-way valve 4 discharges tears in the main pipe 1 unidirectionally.

[0041] The one-way valve 4 only allows tears to flow from the main pipe 1 to the corrugated pipe 5, preventing reverse flow. When tears enter the main pipe 1 under the push of the corrugated pipe 2 and flow towards the corrugated pipe 5, the one-way valve 4 will be opened due to blinking, and the accompanying tear pressure will push open the one-way valve 4, allowing the tears to pass through. When the tear flow stops or there is abnormal pressure in the nasal cavity resulting in reverse pressure, the one-way valve 4 will close, reducing the reflux of bacteria, secretions, etc. in the nasal cavity into the tear duct.

[0042] As Figure 3 shown, the one-way valve 4 is composed of multiple valve plates 41. The valve plates 41 are arranged inside the corrugated pipe 5 and are distributed in an umbrella shape with a taper.

[0043] Multiple valve plates 41 distributed in an umbrella shape with a taper, when the tears flow forward, the tear pressure and blinking action act on the valve plates 41, causing the valve plates 41 to open, forming a funnel-shaped channel for the tears to pass through. The umbrella-shaped distribution enables the valve plates 41 to disperse the pressure more evenly and is easier to open. The tapered channel shape reduces the flow resistance of the tears. When there is reverse pressure, the valve plates 41 closely fit under the action of the pressure, preventing the reverse flow of tears.

[0044] As Figure 5 shown, the thickness of the valve plate 41 gradually decreases from the connection part of the corrugated pipe 5 to the far side.

[0045] The setting of the gradually changing thickness of the valve plate 41 is to better adapt to pressures in different directions. The part closer to the connection of the corrugated pipe 5 is thicker, ensuring the firm connection between the valve plate 41 and the corrugated pipe 5, reducing the detachment of the valve plate 41 during long-term use, and at the same time facilitating the recovery of the valve plate 41 for reuse. The far side is thinner, making it easier to deform and open under the action of the forward tear pressure, reducing the opening pressure; under the action of reverse pressure, the thinner part can fit more closely, enhancing the sealing effect.

[0046] Further, such as Figure 2 and Figure 4 As shown, the spiral guide groove 1 201 and the spiral guide groove 2 501 are both arranged from deep to shallow in depth. The spiral guide groove 1 201 is arranged from deep to shallow from the liquid inlet end to the liquid discharge end of the bellows 1 2, and the spiral guide groove 2 501 is arranged similarly.

[0047] The spiral guide groove 201 is set with a gradual depth change so that the local flow velocity difference forms a shear force to peel off the sediment.

[0048] The main pipe 1, the bellows 1 2 and the bellows 2 5 are all provided with an antibacterial layer (not shown in the figure), and the antibacterial layer is a nano-silver antibacterial layer.

[0049] The nanosilver particles in the nanosilver antibacterial layer have antibacterial activity and can combine with biological macromolecules such as proteins and nucleic acids in bacterial cells to destroy the normal physiological functions of bacteria and inhibit the growth and reproduction of bacteria. The nanosilver antibacterial layer on the surface of the main pipe 1, bellows 1 2 and bellows 2 5 can continuously release nanosilver particles to kill or inhibit the bacteria it contacts.

[0050] Working principle: Tear collection and initial drainage: When the indwelling catheter is inserted into the lacrimal canaliculus, multiple microcolumns 3 use their hydrophilicity to absorb the surrounding tears through capillary action like a sponge absorbing water. These microcolumns 3 are located at the liquid inlet end of the bellows 2, and the end located inside the bellows 2 is arranged along the path of the spiral guide groove 201, which can directly introduce the absorbed tears into the spiral guide groove 201. Since the initial depth of the spiral guide groove 201 is deeper and lower than the height of the tears, the depth difference can be used to accelerate the flow of tears, thereby achieving the initial collection and drainage of tears.

[0051] Blinking drives tear flow: When the patient blinks, the eyelids exert pressure on bellows 1 2 and bellows 2 5. The corrugated structures of bellows 1 2 and bellows 2 5 are elastic and will expand radially after being compressed. After bellows 1 expands, it fits tightly against the lacrimal puncta and generates an anchoring force by means of the friction between the silicone and the mucosa, thereby reducing the phenomenon of the indwelling tube falling out of the lacrimal puncta. After bellows 2 expands, it fits against the inner wall of the lacrimal canaliculus to form a friction anchoring to stabilize the position of the indwelling tube in the lacrimal duct. At the same time, bellows 1 2 will shorten and deform under the action of longitudinal pressure, thereby squeezing the internal tears and generating an axial thrust toward the nasolacrimal duct.

[0052] Tear liquid flows in the tube: under the action of axial thrust, tear liquid flows along the bellows 2 to the main tube 1 under the guidance of the spiral guide groove 201. The spiral guide groove 201 not only guides the flow of tear liquid, but its depth setting from deep to shallow can also make the local flow velocity difference form shear force, peel off possible deposited substances, and reduce pipeline blockage. After the tear liquid enters the main tube 1, it flows to the bellows 2 5.

[0053] The one-way valve controls the discharge of tears: Inside the bellows II 5, there is a one-way valve 4 composed of multiple valve plates 41 distributed in an umbrella shape with a taper. When the tears enter the main tube 1 under the push of the bellows I 2 and flow towards the bellows II 5, the tear pressure and blinking action will cause the valve plate 41 to open, forming a funnel-shaped channel for the tears to pass through. The thickness of the valve plate 41 gradually decreases from the connection with the bellows II 5 to the far side. The relatively thick part near the connection ensures the firm connection with the bellows II 5, and the relatively thin part on the far side makes it easier to deform and open under the action of the forward tear pressure, reducing the opening pressure. When the tear flow stops or there is a reverse pressure due to abnormal pressure in the nasal cavity, the valve plate 41 fits tightly to prevent the reverse flow of tears. The tears enter the spiral diversion groove II 501 through the one-way valve 4. The spiral diversion groove II 501 is also set with a gradually decreasing depth from deep to shallow, further accelerating and guiding the tears. Finally, the bellows II 5 deforms under the tear pressure and discharges the tears.

[0054] The function of the auxiliary structure: The nickel-titanium alloy wire braided mesh 6 embedded inside the main tube 1, the bellows I 2 and the bellows II 5, utilizes its shape memory property and superelasticity to restore or maintain its original shape when the indwelling tube is subjected to external forces such as extrusion and bending by the tissues in the lacrimal duct, providing support for the indwelling tube, enhancing the structural strength, and reducing deformation and collapse. Both the bellows I 2 and the bellows II 5 are divided into an inner PTFE film layer and an outer silicone layer. The inner PTFE film layer has a low surface energy, which can reduce the attachment of components such as proteins and cell debris in tears to the lumen surface, avoiding blockage. The outer silicone layer is soft in texture and has good biocompatibility, which can reduce irritation and friction when contacting the lacrimal duct tissues and reduce the probability of inflammation. The nano-silver antibacterial layer on the surfaces of the main tube 1, the bellows I 2 and the bellows II 5 releases nano-silver particles to bind with biological macromolecules such as proteins and nucleic acids in bacterial cells, destroying the normal physiological functions of bacteria, inhibiting the growth and reproduction of bacteria, keeping the lacrimal duct clean, and reducing infection.

[0055] The embodiments of the present invention have been described above, but these embodiments are not limited to the above specific implementation manners. The above specific implementation manners are only illustrative and not restrictive. Under the inspiration of this embodiment, those of ordinary skill in the art can also make many forms, all of which fall within the protection scope of this embodiment.

Claims

1. A lacrimal duct indwelling tube, characterized in that: It includes a main pipe (1), a bellows 1 (2), a microcolumn (3) and a bellows 2 (5); The liquid inlet end of the main pipe (1) is connected to the bellows 1 (2), and the liquid discharge end is connected to the bellows 2 (5); The first bellows (2) and the second bellows (5) are respectively provided with a spiral guide groove (201) and a spiral guide groove (501); The water microcolumn (3) is arranged at the liquid inlet end of the bellows 1 (2) to guide the tear fluid into the spiral guide groove 1 (201); When the blinking squeezing action is applied to the bellows 1 (2) and the bellows 2 (5), the corrugated structures of the bellows 1 (2) and the bellows 2 (5) expand radially, the bellows 1 (2) fits tightly against the lacrimal puncta, and the bellows 2 (5) is anchored by friction with the inner wall of the lacrimal canaliculus. At the same time, the bellows 1 (2) shortens and deforms due to the longitudinal pressure, generating an axial thrust in the direction of the lacrimal sac, driving the tears to flow in a directional manner along the bellows 1 (2), and the bellows 2 (5) discharges the tears by deforming.

2. The lacrimal duct indwelling tube according to claim 1, characterized in that: The main pipe (1), the first bellows (2) and the second bellows (5) are all internally embedded with a braided mesh (6), and the braided mesh (6) is a nickel-titanium alloy wire braided mesh.

3. The lacrimal duct indwelling tube according to claim 1, characterized in that: The bellows 1 (2) and the bellows 2 (5) are both divided into an inner layer and an outer layer, the outer layer is a silicone layer, and the inner layer is a PTFE film layer.

4. The lacrimal duct indwelling tube according to claim 1, characterized in that: The microcolumn (3) is a hydrophilic microcolumn and is made of polyvinyl alcohol or polyethylene glycol.

5. The lacrimal duct indwelling tube according to claim 4, characterized in that: The number of the micro-pillars (3) is plural, and one end of the plurality of micro-pillars (3) located inside the corrugated tube (2) is located at the spiral guide groove (201) and is arranged along the path of the spiral guide groove (201).

6. A lacrimal duct indwelling tube according to any one of claims 1 to 5, characterized in that: A one-way valve (4) is provided inside the second bellows (5), and the one-way valve (4) discharges tear fluid in the main pipe (1) in a one-way manner.

7. The lacrimal duct indwelling tube according to claim 6, characterized in that: The one-way valve (4) is composed of a plurality of valve plates (41), and the valve plates (41) are arranged inside the second bellows (5), are distributed in an umbrella shape, and have a taper.

8. The lacrimal duct indwelling tube according to claim 7, characterized in that: The thickness of the valve plate (41) gradually decreases from the connection point with the second bellows (5) to the distal side.

9. The lacrimal duct indwelling tube according to claim 1, characterized in that: The spiral guide groove 1 (201) and the spiral guide groove 2 (501) are both arranged from deep to shallow in depth.

10. The lacrimal duct indwelling tube according to claim 8, characterized in that: The main pipe (1), the first bellows (2) and the second bellows (5) are all provided with an antibacterial layer, and the antibacterial layer is a nano-silver antibacterial layer.

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