An artificial tear duct with tear pump function for tear caruncle pathway

Abstract

The present invention relates to an artificial tear duct with tear pump function for the tear caruncle path, comprising a tear duct, a tear collecting duct and a tear outlet duct formed by the upper and lower ends of the tear duct being bent to different sides respectively, a tear collecting duct end being provided with a tear guide container that can be implanted in the tear caruncle, an elastic support member being provided on the tear guide container, the elastic support member having a movable support portion positioned on the upper inner wall or the lower inner wall of the tear guide container, the port of the tear outlet duct being communicated with the nasal cavity, and an outward-turned skirt being provided at the port of the tear outlet duct. By adopting the above technical scheme, the present invention provides an artificial tear duct with tear pump function for the tear caruncle path, the tear duct can be fixed and not moved, and the tear guide effect is good.

Description

Technical Field

[0001] The present invention relates to an ophthalmic surgical implant, in particular to an artificial tear duct with tear pump function for the tear caruncle pathway. Background Art

[0002] Tear duct obstruction is a common disease in ophthalmology. According to the location of the obstruction, it can be divided into nasolacrimal duct obstruction, common lacrimal duct and lacrimal canaliculus obstruction. The clinical manifestations are epiphora and purulent discharge, which significantly reduce the patient's quality of life. Surgery is the main method to achieve tear duct recanalization. With the development of technologies such as lacrimal cystonasal anastomosis and lacrimal duct catheterization, the treatment success rate of tear duct obstruction has increased significantly. However, there are still some failed patients who cannot achieve recanalization of the original tear duct and still have tearing, especially patients with lacrimal canaliculus obstruction or common lacrimal duct obstruction. Because the lacrimal canaliculus lumen is small, only 0.3-0.5mm, and has multiple turns and narrow places, the success rate of surgery is even lower.

[0003] For this type of patients, the current surgical method is to implant a permanent artificial tear duct, which currently includes Jones tubes, medpor tubes, etc. The treatment method is bypass tube surgery, which is to abandon the original tear duct system and re-implant a new bypass tube. However, the use of artificial tear ducts has the following defects:

[0004] 1. Existing bypass tubes generally adopt the principle of gravity drainage and straight tube design, lacking active drainage function, and need to rely on the tear's own power or breathing for drainage, and the tear drainage efficiency is extremely poor;

[0005] 2. Lack of valve function, nasal secretions often enter the conjunctival sac through the artificial tube when sneezing;

[0006] 3. Bypass tubes are currently made of glass or metal with a smooth surface and lack of fixing devices. Tube displacement and dislocation often occur after surgery, causing inconvenience to patients and even causing surgical failure.

[0007] 4. Since the bypass tube implantation site is a new surgical wound, granulation tissue often grows under the stimulation of the bypass tube, blocking the fistula and causing the operation to fail. Summary of the invention

[0008] Purpose of the present invention: In order to overcome the defects of the prior art, the present invention provides an artificial tear duct with a tear pump function for the tear caruncle path, the tear duct can be fixed and not move, and the tear-inducing effect is good.

[0009] The technical solution of the present invention is as follows: an artificial tear duct with tear pump function for the lacrimal caruncle pathway, comprising a lacrimal sac duct, a tear collecting duct and a tear outlet duct formed by the upper and lower ends of the lacrimal sac duct being bent to different sides respectively, a tear collecting duct end being provided with a tear induction container implantable in the lacrimal caruncle, an elastic support member being provided on the tear induction container, the elastic support member having a movable support portion positioned on the upper inner wall or the lower inner wall of the tear induction container, a port of the tear outlet duct being communicable with the nasal cavity, and a turned-out skirt being provided at the port of the tear outlet duct.

[0010] Preferably, the elastic supporting member may be in sheet or tube shape.

[0011] The technical solution of the present invention adopts the lacrimal caruncle path to practice conjunctival-lacrimal sac nasal anastomosis, thereby avoiding the lacrimal canaliculus and preparing an artificial tear duct via the lacrimal caruncle path. The artificial tear duct provides a tear pump function, simulates the liquid collecting part of the tear sac and the outlet part communicating with the nasal cavity, the tear guide container can be implanted in the lacrimal caruncle of the human body, the lacrimal sac duct is buried in the lacrimal sac of the human body, and the lacrimal outlet duct communicates with the nasal cavity; the skirt is located in the nasal cavity, which can prevent the hyperplastic granulation from blocking the artificial tear duct, and can also play a fixing role to ensure that the artificial tear duct does not shift, and the tears are discharged into the lacrimal sac duct through the tear guide container and then into the nasal cavity.

[0012] The technical solution of the present invention has the following beneficial effects:

[0013] 1. Perfectly avoid the lacrimal canaliculus, effectively overcoming the problems caused by the small diameter of the lacrimal canaliculus during surgery;

[0014] 2. The artificial tear duct adopts a curved tube design, which conforms to the physiological tear duct morphology of the human body, making tears flow more smoothly and having a good tear drainage effect;

[0015] 3. An elastic support member is provided, which has a movable support part located on the upper inner wall or the lower inner wall of the tear-inducing container. When the eyelids are opened and closed, the elastic support member drives the tear-inducing container to deform. When the eyelids are opened, the artificial tear duct expands under the elastic action of the elastic support member, forming a negative pressure, which attracts tears into the lumen. When the eyelids are closed, the anterior tarsal muscle contracts, squeezing the tear-inducing container to narrow it instantly, and the internal pressure of the container increases, which compresses the tears and discharges them through the artificial tear duct, thereby realizing the tear drainage function;

[0016] 4. The skirt can block the proliferation of granulation tissue, avoid blocking the fistula and causing the operation to fail; and the skirt is also fixed by the proliferation of granulation tissue to ensure that the artificial tear duct does not shift;

[0017] The present invention is further configured as follows: a curved section is provided between the lacrimal collecting duct and the lacrimal sac duct, and the elastic support member may extend a positioning support portion onto the inner wall of the curved section.

[0018] By adopting the above further configuration, the elastic restoring effect of the elastic support member is improved through the configuration of the positioning support portion.

[0019] The present invention is further provided with a one-way valve in the tear duct, the one-way valve comprising two thin film sheets which can be closely attached to prevent the backflow of liquid in the nasal cavity, and a tear channel for the tear liquid to enter the nasal cavity can be formed between the two thin film sheets.

[0020] With the above configuration further adopted, a one-way valve is provided in the tear duct, and the two thin film sheets can fit together to close the tear channel, thereby preventing the backflow of liquid in the nasal cavity and realizing the one-way valve function.

[0021] A further configuration of the present invention is that the port of the tear-inducing container is outwardly expanded.

[0022] With the above further configuration, the port of the tear inducing container is expanded outwards to facilitate the entry of tears into the artificial tear duct.

[0023] The present invention is further configured that: a side surface of the tear-inducing container corresponding to the eyeball is an arc-shaped concave surface.

[0024] With the above further configuration, the arc-shaped concave surface of the tear-inducing container conforms to the physiological morphology of the human eye, reduces discomfort, and has a good use effect.

[0025] The present invention is further configured that the inner diameter of the lacrimal sac duct on the side close to the lacrimal outlet duct is smaller than the inner diameter of the lacrimal sac duct on the side close to the lacrimal collecting duct, thereby forming a fluid accumulation chamber with a gradually decreasing inner diameter.

[0026] With the above further configuration, if the tear secretion is less, the tear can accumulate in the fluid chamber to a certain extent, and the tear in the chamber is quickly discharged when the eyelids are closed.

[0027] The present invention is further configured as follows: the inner diameter of the tear-inducing container is 3-5 mm, the inner diameter of the lacrimal sac duct is 3-4 mm, and the outer diameter of the skirt is 5-6 mm.

[0028] By adopting the above further configuration, the specification of the artificial tear duct is more reasonable, suitable for the diameter of the human body, and has a better use effect.

[0029] A further configuration of the present invention is that the elastic support member can be made of metal material.

[0030] By adopting the above further arrangement, the tear-inducing container has a good supporting effect and the elastic force is maintained for a long time. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 is a structural diagram of a specific embodiment of the present invention;

[0032] Figure 2 It is an internal structure diagram of a specific embodiment of the present invention, wherein the tear channel of the one-way valve is in a closed state;

[0033] Figure 3It is an internal structure diagram of a specific embodiment of the present invention, wherein the tear channel of the one-way valve is in an open state;

[0034] Figure 4 This is a schematic diagram of an artificial tear duct implanted in a human body according to a specific embodiment of the present invention. DETAILED DESCRIPTION

[0035] The technical scheme in this embodiment will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0036] like Figure 1-4 As shown, an artificial tear duct with tear pump function for the tear caruncle path of the present invention comprises a tear sac duct 1, a tear collecting duct 2 and a tear discharge duct 3 formed by the upper and lower ends of the tear sac duct 1 being bent to different sides respectively. The tear collecting duct 2, the tear discharge duct 3 and the tear sac duct 1 are generally formed in one piece, but of course they can also be separately provided and then connected and fixed. A tear guide container 4 that can be implanted in the tear caruncle is provided at the end of the tear collecting duct 2, and an elastic support member 5 is provided on the tear guide container 4, and the elastic support member 5 has a movable support member positioned on the upper inner wall or the lower inner wall of the tear guide container 4. The part 51, the "upper" refers to the side of the tear container 4 facing the upper eyelid after the artificial tear duct is implanted, and the port of the tear duct 3 can be communicated with the nasal cavity; there is a curved section 11 between the tear collecting duct 2 and the lacrimal duct 1, and the elastic support member 5 can extend a positioning support part 52 to the inner wall of the curved section 11, and the positioning support part 52 can also extend to the inner wall of the lacrimal duct 1; the elastic support member 5 can be sheet-shaped or tubular, and the tubular elastic support member 5 can be a circumferentially closed tube or a "C"-shaped tube with an opening, which is supported on the upper and lower inner walls of the tear container 4;

[0037] The movable supporting portion 51 of the sheet-like elastic supporting member 5 is located on the upper inner wall of the tear inducing container 4, and the corresponding positioning supporting portion 52 is located on the inner wall on the side with the larger diameter of the curved section 11; if the movable supporting portion 51 of the sheet-like elastic supporting member 5 is located on the lower inner wall of the tear inducing container 4, then the positioning supporting portion 52 is correspondingly located on the inner wall on the side with the smaller diameter of the curved section 11. The elastic supporting member 5 can be made of metal material, and of course it can also be made of other materials that can undergo elastic deformation, such as silicone, rubber, etc.; an outward-turned skirt 6 is provided at the port of the tear duct 3, and the skirt 6 is integrally arranged with the tear duct 3, and of course it can be a split body with a fixed connection; a one-way valve 7 is also provided in the tear duct 3, and the one-way valve 7 includes two thin film sheets 71 that can be tightly attached to prevent the reflux of liquid in the nasal cavity, and a supply can be formed between the two thin film sheets 71 Tears enter the tear channel 72 in the nasal cavity, and the two film sheets 71 can be two separate sheets or folded from one sheet; the port of the tear inducing container 4 is expanded outward in a trumpet shape, and the inner diameter of the tear inducing container 4 gradually decreases toward the tear collecting duct 2, roughly in a funnel shape; the side of the tear inducing container 4 corresponding to the eyeball is an arc-shaped concave surface 41; the inner diameter of the tear inducing container 4 is 3-5mm, the inner diameter of the lacrimal duct 1 is 3-4mm, the wall thickness of the lacrimal duct 1 is 0.1-0.2mm, and the outer diameter of the skirt 6 is 5-6mm; the tear collecting duct 2 and the tear duct 1 can form an angle of 90-110°, and the tear outlet duct 3 and the tear duct 1 can form an angle of 80-110°; the inner diameter of the tear duct 1 close to the tear outlet duct 3 is smaller than the inner diameter of the tear duct 2 close to the tear collecting duct, thereby forming a fluid accumulation chamber 12 with a gradually decreasing inner diameter.

[0038] The artificial tear duct provides tear pump function, simulates the liquid collecting part of the tear sac and the outlet part communicating with the nasal cavity, the tear induction container 4 can be implanted in the tear caruncle of the human body, the tear sac duct 1 is buried in the tear sac of the human body, the tear outlet duct 3 is communicated with the nasal cavity, and the skirt 6 is located in the nasal cavity to prevent the artificial tear duct from being blocked by the hyperplastic granulation tissue, and also plays a fixing role. The tears enter the tear sac duct 1 through the tear induction container 4 and are discharged into the nasal cavity;

[0039] When the eyelids are opened, the artificial tear duct expands under the elastic action of the elastic support member 5, forming a negative pressure, which attracts tears into the lumen and the fluid accumulation chamber 12 of the lacrimal duct 1. When the eyelids are closed, the anterior tarsal muscle contracts, squeezing the movable support portion 51 of the elastic support member 5, and the positioning support portion 52 is relatively fixed, so that the movable support portion 51 drives the tear induction container 4 to deform, and the tear induction container 4 becomes narrow instantly, the internal pressure of the container increases, and the tears in the fluid accumulation chamber 12 are quickly discharged into the tear duct 3, and the tear channel 72 between the two film sheets 71 can be opened by the impact of tears, and the tears are finally discharged into the nasal cavity. Then the two film sheets 71 fit together to close the tear channel 72 to prevent the liquid in the nasal cavity from flowing back, thereby realizing a one-way valve.

Claims

1. An artificial tear duct with tear pump function for use in the tear caruncle path, characterized in that: It includes a lacrimal sac duct, a tear collecting duct and a tear outlet duct formed by the upper and lower ends of the lacrimal sac duct being bent to different sides respectively, a tear induction container implanted in the lacrimal caruncle is provided at the end of the tear collecting duct, an elastic support member is provided on the tear induction container, the elastic support member has a movable support portion positioned on the upper inner wall or the lower inner wall of the tear induction container, the port of the tear outlet duct is communicated with the nasal cavity, and an outward-turned skirt is provided at the port of the tear outlet duct; There is a curved section between the lacrimal collecting duct and the lacrimal sac duct, and the elastic support member may extend a positioning support portion onto the inner wall of the curved section; A one-way valve is also provided in the tear duct, and the one-way valve includes two thin film sheets that can be closely attached to prevent the liquid in the nasal cavity from flowing back, and a tear channel for the tear liquid to enter the nasal cavity can be formed between the two thin film sheets; The inner diameter of the lacrimal sac duct on the side close to the lacrimal outlet duct is smaller than the inner diameter of the lacrimal sac duct on the side close to the lacrimal collecting duct, forming a fluid accumulation chamber with a gradually decreasing inner diameter.

2. The artificial tear duct according to claim 1, characterized in that: The elastic supporting member is in sheet or tube shape.

3. The artificial tear duct according to claim 1, characterized in that: The port of the tear-inducing container is arranged to expand outward.

4. The artificial tear duct according to claim 1, characterized in that: The side surface of the tear-inducing container corresponding to the eyeball is an arc-shaped concave surface.

5. The artificial tear duct according to claim 1, characterized in that: The inner diameter of the tear-inducing container is 3-5 mm, the inner diameter of the lacrimal sac duct is 3-4 mm, and the outer diameter of the skirt is 5-6 mm.

6. The artificial tear duct according to claim 1, characterized in that: The elastic supporting member is made of metal material.

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