Indwelling catheter for nasolacrimal duct recanalization
By designing a nasolacrimal duct placement device that includes a flexible tube body, catheter, reservoir, and sensor, the problems of easy displacement of nasolacrimal duct devices and inflammatory reactions have been solved, achieving stable placement and continuous treatment effects.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-02-21
- Publication Date
- 2026-04-03
AI Technical Summary
Existing nasolacrimal duct catheterization devices are prone to displacement or slippage in daily life, and prolonged presence can lead to local inflammatory reactions in patients.
A nasolacrimal duct cannulation device was designed, comprising an elastic tube body, a through first catheter, a second catheter connected by a one-way valve, a reservoir, a functional strip, and a sensor. The device is fixed in the nasolacrimal duct by a traction wire. The reservoir releases drugs slowly, the functional strip provides local anesthesia and anti-inflammatory effects, and the sensor collects data.
It achieves stability in nasolacrimal duct placement, reduces inflammatory responses during long-term placement, and provides continuous drug treatment effects and real-time monitoring capabilities.
Smart Images
Figure CN224070672U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of ophthalmic surgery, and in particular to a catheter used in nasolacrimal duct recanalization surgery. Background Technology
[0002] The main function of the nasolacrimal duct is to guide tears into the nasal cavity, thereby keeping the eyes moist and draining excess tears. Blockage of the nasolacrimal duct can lead to symptoms such as excessive tearing and persistent tearing; surgery is needed to restore its opening in these cases.
[0003] If the patient's nasolacrimal duct is not completely blocked, a tubular device can be inserted before surgery. By squeezing the wall of the nasolacrimal duct, it can not only provide a basis for subsequent surgery, but also temporarily drain tears. However, existing devices of this type are prone to displacement or even slippage in daily life after placement. Moreover, these devices can be left in place for several days to several weeks. The long-term presence of foreign objects can easily cause local inflammation in patients. Utility Model Content
[0004] The present invention aims to at least partially solve one of the technical problems in the aforementioned technologies. Therefore, the purpose of this invention is to provide a catheter that can be stably placed in the nasolacrimal duct and reduces local adverse reactions in patients during prolonged placement.
[0005] To achieve the above objectives, embodiments of this utility model propose a catheter for nasolacrimal duct recanalization, comprising a tube body made of elastic material, a first catheter centrally located inside, and a second catheter located on one side of the first catheter. The second catheter is connected to the outside via a one-way valve, and its other end is connected to a reservoir. The reservoir is located inside the tube body, and the distance between the reservoir and the outer wall of the tube body is less than the distance between the reservoir and the first catheter. A through groove is wound around the outer wall of the tube body, and the through groove has a circular cross-section. A functional strip made of porous silicone material is embedded in the through groove, and a sensor is also provided in the functional strip. Two traction wires are connected to the two ends of the tube body respectively.
[0006] According to an embodiment of the present invention, a catheter is inserted into the nasolacrimal duct recanalization procedure by passing a traction wire through the nasolacrimal duct and pulling the catheter body into the nasolacrimal duct. The catheter body stays in the nasolacrimal duct. One end of the first catheter is close to the lacrimal sac, and the other end is connected to the nasal cavity to drain the tears into the nasal cavity. The reservoir sac is inflated with water and stuck in the lacrimal sac. The functional strip set in the channel can release drugs slowly and collect data through sensors and transmit it to external devices.
[0007] In addition, the catheter used in the nasolacrimal duct recanalization procedure according to the above embodiments of this utility model may also have the following additional technical features:
[0008] Optionally, there are at least three reservoirs arranged circumferentially along the tube to provide more anchoring points and reduce pressure.
[0009] Furthermore, the reservoirs are ellipsoidal or arc-shaped, connected sequentially, but not end-to-end.
[0010] Optionally, the ratio of the cross-sectional area of the first conduit to that of the tube body shall not exceed 1:2.
[0011] Optionally, the tube body is provided with a pull hole in the radial direction for the traction line to pass through.
[0012] Optionally, a cutting line is provided on the tube body, which passes through the second conduit. The water in the reservoir can be drained by cutting the tube body along the cutting line.
[0013] Optionally, the through slots are provided in two or three sections, which can accommodate different functional strips.
[0014] Optionally, the cross-section of the second conduit is elliptical or arc-shaped, which allows for more flexible arrangement of the second conduit within the tube body. Attached Figure Description
[0015] Figure 1 This is an overall structural diagram from one angle according to an embodiment of the present invention;
[0016] Figure 2 This is an overall structural view from another angle according to one embodiment of the present invention;
[0017] Figure 3 This is a cross-sectional view according to an embodiment of the present invention;
[0018] Figure 4 This is a cross-sectional view of one end according to an embodiment of the present invention;
[0019] Figure 5 This is a cross-sectional view of another end according to an embodiment of the present invention.
[0020] Label Explanation:
[0021] Tube body 1, notch 11
[0022] First catheter 2 Second catheter 3
[0023] Liquid reservoir 4, through groove 5
[0024] Function bar 6, traction line 7
[0025] Cutting line 8. Detailed Implementation
[0026] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this utility model, and should not be construed as limiting this utility model.
[0027] This invention uses a traction wire to pass through the nasolacrimal duct, pulling the tube body into the nasolacrimal duct. The tube body stays inside the nasolacrimal duct. One end of the first catheter is close to the lacrimal sac, and the other end is connected to the nasal cavity to drain tears into the nasal cavity. The reservoir sac is inflated with water and stuck inside the lacrimal sac. The functional strip located in the channel can release drugs slowly and collect data through sensors, transmitting the data to external devices.
[0028] To better understand the above technical solutions, exemplary embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. Although exemplary embodiments of the present invention are shown in the drawings, it should be understood that the present invention can be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided to enable a more thorough understanding of the present invention and to fully convey the scope of the present invention to those skilled in the art.
[0029] To better understand the above technical solutions, the following will provide a detailed explanation of the technical solutions in conjunction with the accompanying drawings and specific implementation methods.
[0030] Figures 1 to 4 The catheter used in a nasolacrimal duct recanalization procedure according to an embodiment of the present invention includes a tube body 1 made of elastic material. The tube body 1 is placed inside the nasolacrimal duct during use. Therefore, the diameter of the tube body 1 needs to be designed to both pass through the narrow nasolacrimal duct and provide a certain amount of support. Therefore, its outer diameter is between 1.5 and 2.5 mm, with 2 mm being the preferred option.
[0031] The end of the tube body 1 near the lacrimal sac can be further provided with a recess 11 that is concave downward along the axis, such as a funnel-shaped or hemispherical recess 11. The lowest point of the recess 11 is located in the first conduit 2. The ratio of the depth of the recess 11 to the diameter of the tube body 1 is between 1:1 and 1:3, preferably 1:2. This structure can facilitate the convergence of tears into the first conduit 2.
[0032] The first conduit 2, which is centrally located inside the tube, is used to drain tears and replaces the function of the nasolacrimal duct. Specifically, the ratio of the cross-sectional area of the first conduit 2 to that of the tube body 1 is no greater than 1:2. This is based on tests of commonly used materials. This design can meet the needs of draining tears without causing the radial support of the tube body 1 to be too low due to the large proportion of the first conduit 2, which would make it easy to be flattened by the nasolacrimal duct.
[0033] The second conduit 3 is located on one side of the first conduit 2. The second conduit 3 is connected to the outside via a one-way valve, and its other end is connected to the reservoir 4. The purpose of the second conduit 3 is to fill and drain the reservoir 4. Therefore, while fulfilling its function, it should be as thin as possible to reduce the problem of expansion after filling with water and the negative impact on the overall radial support force of the tube body 1. For this purpose, the cross-section of the second conduit 3 is elliptical or arc-shaped, allowing for more flexible arrangement of the second conduit 3 within the tube body 1.
[0034] The reservoir 4 is located inside the tube body 1. The distance between the reservoir 4 and the outer wall of the tube body 1 is less than the distance between the reservoir 4 and the first conduit 2, so as to ensure that when the reservoir 4 expands, it expands outward into the lacrimal sac rather than blocking the first conduit 2 inward.
[0035] Specifically, there are at least three liquid reservoirs 4. The three liquid reservoirs 4 can be evenly arranged at equal angles along the circumference of the tube 1, or they can be in the same circumference or at different heights in the circumference, in order to avoid the through groove 5 mentioned later; to provide more fixing points and reduce pressure.
[0036] Furthermore, the liquid storage bladders 4 are ellipsoidal or arc-shaped, connected sequentially but not end-to-end. When they are ellipsoidal, the length direction of the ellipsoid is consistent with the length direction of the tube body 1; the arc-shaped design can be referenced from tiles.
[0037] The through groove 5 is wound around the outer wall of the tube body 1. The cross-section of the through groove 5 is circular, and the cross-section can be regarded as being divided into a major arc and a minor arc by the outer diameter of the tube body 1. The major arc part exists in the tube body 1 to secure the functional strip 6. Optionally, there are two or three through grooves 5 to accommodate different functional strips 6. When not in use, the through groove 5 can be filled with lubricant for easy pulling.
[0038] A functional strip 6 made of porous silicone material is embedded in the through groove 5. The functional strip 6 also contains a sensor. The specific structure and manufacturing method of the multi-control silicone material are existing technologies and will not be described in detail here. The purpose of setting the functional strip 6 is to give it local anesthetic and local anti-inflammatory effects. As mentioned above, when the tube body 1 is placed in the nasolacrimal duct, it is prone to inflammation over time. Applying the drug only to the surface of the tube body 1 does not have a good lasting effect, and the drug will accumulate in a small area during traction, which cannot act evenly. Making the entire tube body 1 into porous silicone material will not only increase the cost, but also reduce the overall strength. Therefore, by using the existing mature solution to manufacture the tube body 1 and using the embedded functional strip 6 locally, the tube body 1 can be flexibly configured to have more functions, such as having both anti-inflammatory and anesthetic effects.
[0039] The sensor in function bar 6 can be a temperature sensor to detect the patient's body temperature, or a pressure sensor to detect pressure and prevent excessive pressure on the nasolacrimal duct from causing local tissue ischemia and necrosis.
[0040] When the functional strip 6 is inserted into the spiral groove 5, the tube body 1 can be twisted in the opposite direction of the spiral of the groove 5 to open the groove 5 and facilitate the insertion of the functional strip 6.
[0041] Two traction lines 7 are connected to the two ends of the tube body 1 respectively, and are used to pull the tube body 1 into place. Specifically, the tube body 1 has a traction hole along the radial direction for the traction lines 7 to pass through. The traction lines 7 can be existing sutures.
[0042] In some embodiments, the tube body 1 is provided with a cutting line 8, which passes through the second conduit 3. Cutting the tube body 1 along the cutting line 8 will allow the water in the reservoir 4 to flow out.
[0043] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.
[0044] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.
[0045] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. The illustrative expressions of the above terms in this specification should not be construed as necessarily referring to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. In addition, those skilled in the art can combine and integrate the different embodiments or examples described in this specification.
[0046] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.
Claims
1. A catheter used in nasolacrimal duct recanalization surgery, characterized in that: include The tube body is made of elastic material and has a first conduit running through it in the center of the interior, and a second conduit located on one side of the first conduit. The second conduit is connected to the outside through a one-way valve and its other end is connected to a reservoir. The reservoir is located inside the tube body and the distance between the reservoir and the outer wall of the tube body is less than the distance between the reservoir and the first conduit. A through groove is wound around the outer wall of the tube. The through groove has a circular cross-section and a functional strip made of porous silicone material is embedded in the through groove. The functional strip is also equipped with a sensor. Two traction lines are connected to the two ends of the pipe body, respectively.
2. The catheter used in a nasolacrimal duct recanalization procedure as described in claim 1, characterized in that: There are at least three liquid storage bladders arranged circumferentially along the tube body.
3. The catheter used in a nasolacrimal duct recanalization procedure as described in claim 2, characterized in that: The liquid storage bladders are ellipsoidal or arc-shaped and connected in sequence.
4. The catheter used in a nasolacrimal duct recanalization procedure as described in claim 1, characterized in that: The ratio of the cross-sectional area of the first conduit to that of the tube body is no greater than 1:
2.
5. The catheter used in a nasolacrimal duct recanalization procedure as described in claim 1, characterized in that: The tube body is provided with a pull hole along the radial direction for the traction line to pass through.
6. The catheter used in a nasolacrimal duct recanalization procedure as described in claim 1, characterized in that: The tube body is provided with a cutting line, which passes through the second conduit.
7. The catheter used in a nasolacrimal duct recanalization procedure as described in claim 1, characterized in that: The through slot has two or three slots.
8. The catheter used in a nasolacrimal duct recanalization procedure as described in claim 1, characterized in that: The second conduit cross-section is elliptical or arc-shaped.