A lacrimal passage drainage stent suitable for traumatic dacryocystitis

Abstract

The application discloses a lacrimal passage drainage stent suitable for traumatic lacrimal sac inflammation and relates to the technical field of traumatic lacrimal passage. The application discloses a lacrimal passage drainage stent suitable for traumatic lacrimal sac inflammation and relates to the technical field of traumatic lacrimal passage. The application discloses a lacrimal passage drainage stent suitable for traumatic lacrimal sac inflammation and relates to the technical field of traumatic lacrimal passage.

Description

Technical Field

[0001] This invention relates to the field of lacrimal duct trauma technology, and in particular to a lacrimal duct drainage stent suitable for traumatic dacryocystitis. Background Technology

[0002] The lacrimal duct drainage tube serves to support, isolate, dilate, and drain the obstructed areas of the lacrimal sac and duct. It creates a favorable environment and allows time for the lacrimal duct to heal itself. Once the inflammatory obstruction or traumatized ruptured lacrimal duct has healed into a patent physiological lacrimal duct, the inserted drainage tube is removed. The lacrimal duct drainage tube effectively prevents anastomotic obstruction, lacrimal canaliculi, and common canaliculus adhesions. For patients with traumatic lacrimal duct obstruction, proper support, dilation, and drainage of the anastomosis site after dacryocystorhinostomy are crucial for improving the success rate of the surgery. Patients with traumatic lacrimal duct obstruction leading to chronic dacryocystitis have complex conditions, often accompanied by: 1. bone loss or displacement in the lacrimal sac area; 2. compression, deformation, or displacement of the lacrimal sac or nasolacrimal duct; 3. scar contracture following injury to the membranous lacrimal system, resulting in narrowing or even obstruction of the lumen. Currently, the treatment for chronic dacryocystitis secondary to traumatic lacrimal duct obstruction typically involves dacryocystorhinostomy combined with tube placement. The key to this surgery is locating the displaced or deformed lacrimal sac and creating a large anastomosis between the lacrimal sac and the nasal cavity. Commonly used lacrimal duct tube types include the Crawford tube and the newer RS ​​tube. However, in patients with traumatic dacryocystitis, the physiological structures of the lacrimal duct and the nasal cavity are damaged, with fractures and mucosal injuries being particularly common. The increased distance between the anterior and posterior flaps of the lacrimal sac mucosa and the anterior and posterior flaps of the nasal mucosa due to lacrimal sac displacement increases the difficulty of suturing, and postoperative problems such as mucosal misalignment, anastomotic scarring, and granulation tissue hyperplasia can easily occur, leading to surgical failure.

[0003] Currently, there are few existing lacrimal duct prostheses specifically designed for traumatic lacrimal duct obstruction. When fixing the cannula by tying a knot at the lower end of a double-tube lacrimal drainage support, it's difficult to accurately control the tightness of the fixation. If the knot is too high, the cannula and the double-tube lacrimal drainage tube will be too tightly fixed, and the patient's eye-opening and closing movements can easily pull inward on the upper and lower lacrimal puncta, even causing tearing of the lacrimal puncta. If the knot is too low, the cannula cannot effectively support and isolate the lacrimal sac mucosa and the anterior and posterior flaps of the nasal mucosa, affecting tear drainage. A large knot at the lower end of a double-tube lacrimal drainage tube in the nasal cavity can affect airflow in the nasal cavity, causing a foreign body sensation in the patient. At the same time, nasal secretions easily adhere to the knot, leading to bacterial growth and infection, which can affect the healing of the anastomosis. Therefore, we propose a lacrimal drainage stent suitable for traumatic dacryocystitis. Summary of the Invention

[0004] To overcome the shortcomings of existing technologies, this invention designs a lacrimal duct drainage stent suitable for traumatic dacryocystitis, including an RS-type lacrimal duct drainage tube, a fixing cap, and a sleeve. By designing a ring-shaped buckle structure and using the fixing cap, the sleeve can be effectively fixed at the ideal lacrimal duct opening and anastomosis position, and fully play a supporting and expanding role.

[0005] To solve the above-mentioned technical problems, the present invention provides the following technical solution: a lacrimal duct drainage stent suitable for traumatic dacryocystitis, comprising an RS-type lacrimal duct drainage tube, a fixation cap, and a sleeve. A first snap-fit ​​structure is provided on the outer wall of both ends of the drainage tube at a distance of 45-50 mm from the blind end. The fixation cap has two channels inside, each with an outer diameter equal to that of the two ends of the drainage tube. Each channel has a channel snap-fit ​​structure at 1 mm intervals on its inner wall, which is a recessed structure on the same annular surface of the inner wall of the channel. A disc-shaped structure is connected to the top of the fixation cap, and the disc-shaped structure is integral with the fixation cap. An outer wall snap-fit ​​structure is provided on the outer wall of the fixation cap for fixing to the sleeve. A sleeve snap-fit ​​structure is provided on the inner wall of the sleeve, which engages with the outer wall snap-fit ​​structure of the fixation cap. The RS-type lacrimal duct drainage tube, the fixation cap, and the sleeve are all made of soft, safe, and corrosion-resistant medical-grade silicone material.

[0006] As a preferred embodiment of the present invention, the drainage tube is made of medical-grade silicone material. The drainage tube is 128mm long and consists of a thin middle section and thicker side sections. The diameter of the middle section is 0.5mm, and the side sections are hollow with an outer diameter of 1.5mm and an inner diameter of 0.5mm. There is a blue surgical reference mark in the middle of the drainage tube. Both ends of the drainage tube are closed blind ends, and there is a slit 50mm away from the apex of each blind end. The stainless steel probe is inserted into the drainage tube through the slit to guide the drainage tube into the lacrimal duct.

[0007] As a preferred embodiment of the present invention, the fixing cap is a cylindrical structure with two hollow tubes having an inner diameter of 1.5 mm inside. A disc-shaped structure is connected to the top of the tubes. The disc-shaped structure is integral with the tube body and has an outer diameter of 5.5 mm. The fixing cap is about 6-8 mm long and has an outer diameter of 4.5 mm. Channel buckle structures are provided on the inner walls of the two hollow tubes at 1 mm intervals. A fixing cap outer wall buckle structure for fixing to the sleeve is provided on the outer wall of the fixing cap 1 mm from the top.

[0008] As a preferred embodiment of the present invention, the sleeve is a hollow pipe with a length of about 10 mm, an inner diameter of 4.5 mm, and an outer diameter of about 5-6 mm. The inner wall of the sleeve is provided with a sleeve buckle structure about 1 mm from the top, which can be engaged and fixed with the buckle structure of the outer wall of the fixing cap.

[0009] As a preferred embodiment of the present invention, the cannula, fixation cap, and drainage tube are all made of medical-grade silicone material.

[0010] As a preferred embodiment of the present invention, the stainless steel probe is inserted into both sides of the drainage tube through the slit, so that the stainless steel probe can pull the drainage tube through the lacrimal punctum, lacrimal canaliculus, common lacrimal duct and dacryocystorhinostomy in sequence.

[0011] Compared with the prior art, the beneficial effects that this invention can achieve are: The designed cannulated double lacrimal canaliculus lacrimal duct support and drainage tube, through the combination of an RS-type lacrimal duct drainage tube, a fixation cap, and a cannula, effectively fixes the cannula and drainage tube at the position from the opening of the common lacrimal duct to the dacryocystorhinostomy, providing ample support and expansion, improving the stability of the cannula's position, and effectively promoting the healing of the lacrimal sac mucosa and nasal mucosa epithelium, reducing the risk of recurrence. Compared with traditional silicone tubes, the design of this invention eliminates the need for knotted silicone tubes, reducing the foreign body sensation in the patient's nasal cavity, and also reducing the deposition and adhesion of secretions and toxic substances. Therefore, the technical solution of this invention has high clinical application value and promising prospects for promotion. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the RS-type lacrimal duct drainage tube structure of the present invention; Figure 2 This is a front cross-sectional view of the RS-type lacrimal duct drainage tube structure of the present invention; Figure 3 This is a three-dimensional schematic diagram of the fixing cap of the present invention; Figure 4 This is a three-dimensional schematic diagram of the sleeve of the present invention.

[0013] The components include: 1. Drainage tube; 2. Fixing cap; 3. Sleeve; 4. Stainless steel probe; 5. Polypropylene handle; 6. Slit hole; 8. Hollow tube; 9. Fixing cap outer wall snap-fit ​​structure; 10. Channel snap-fit ​​structure. Detailed Implementation

[0014] To make the technical means, creative features, and achieved objectives and effects of this invention easier to understand, the invention is further described below with reference to specific embodiments. However, the following embodiments are merely preferred embodiments of this invention and not all of them. Other embodiments obtained by those skilled in the art based on the embodiments described herein without creative effort are all within the protection scope of this invention. Unless otherwise specified, the experimental methods in the following embodiments are conventional methods, and the materials and reagents used in the following embodiments are commercially available unless otherwise specified.

[0015] like Figure 1-4As shown, the cannulated double lacrimal cannula lacrimal duct support drainage tube provided by the present invention includes an RS-type lacrimal duct drainage tube 1, a fixing cap 2, and a cannula 3. The RS-type lacrimal duct drainage tube 1 consists of a thin middle section and thicker side sections, with a first snap-fit ​​structure located 45-50 mm from the blind end on the outer wall of each side end. The fixing cap has two channels with outer diameters equal to those of the side sections of the drainage tube. Each channel has a snap-fit ​​structure at 1 mm intervals on its inner wall, which matches and fixes the first snap-fit ​​structure at each side end of the drainage tube. Furthermore, a blue surgical reference mark is located in the center of the RS-type lacrimal duct drainage tube 1. Both ends are closed blind ends, with a slit 50 mm from the apex of each blind end. A stainless steel probe can be inserted through these slits to guide the drainage tube into the lacrimal duct.

[0016] Among them, the outer walls of both ends of the drainage tube 1 are provided with a first buckle structure a at a distance of 45-50mm from the blind end. The first buckle structure a is matched and fixed with the channel buckle structure of the inner wall of the channel of the fixing cap 2.

[0017] The fixing cap 2 has two hollow pipes with an inner diameter of 1.5mm inside. The inner wall of the pipes has a channel buckle structure c about 1mm from the top, and a channel buckle structure d is set on the inner wall of the channel at 1mm intervals. The top of the fixing cap 2 is connected to a disc-shaped structure e, which is an integral structure with the fixing cap 2. The outer wall of the fixing cap 2 has a fixing cap outer wall buckle structure f, which is used to fix it to the sleeve 3.

[0018] The sleeve 3 is a hollow pipe with a length of about 10mm, an inner diameter of 4.5mm, and an outer diameter of about 5-6mm. About 1mm from the top of the inner wall, there is a sleeve snap structure g that can be engaged and fixed with the snap structure f of the outer wall of the fixing cap 2.

[0019] The cannula, fixation cap, and drainage tube in the lacrimal duct drainage stent for traumatic dacryocystitis provided by this invention are all made of medical-grade silicone material and have the characteristics of being soft, safe, and not easily corroded.

[0020] In actual use, a stainless steel probe is inserted into both sides of the drainage tube through the gap in the drainage tube to pull the drainage tube through the lacrimal punctum, lacrimal canaliculus, common lacrimal duct and dacryocystorhinostomy in sequence.

[0021] Example The following is merely one embodiment and is not intended to limit the scope of protection of this invention.

[0022] RS-type lacrimal duct drainage tubes, fixation caps, and sheaths are manufactured using electronic injection molding. All materials are medical-grade silicone, which is soft, safe, and corrosion-resistant. The drainage tube is 128mm long and consists of a thin middle section and two thicker side sections. The middle section has a diameter of 0.5mm, while the side sections are hollow with an outer diameter of 1.5mm and an inner diameter of 0.5mm. The fixation cap has a disc-shaped structure at the top, integrated with the cap, and features two channels with outer diameters equal to the side sections of the drainage tube. Each channel has a 1mm interval between channel clips on its inner wall. The outer wall of the fixation cap has a clip 1mm from the top for securing with the sheath. The sheath is a hollow tube approximately 10mm long with an inner diameter of 4.5mm and an outer diameter of approximately 5-6mm. Approximately 1mm from the top of the inner wall, the sheath has a clip that engages with the clip on the outer wall of the fixation cap for secure fixation.

[0023] This invention provides a lacrimal duct drainage stent suitable for traumatic dacryocystitis. Through improved fixation methods and a special structural design, it solves the problems of unreliable fixation and poor drainage effect found in existing lacrimal duct drainage stents. Furthermore, it is made of medical-grade silicone material, which is soft, safe, and corrosion-resistant, making it more suitable for human use.

[0024] In summary, the designed cannulated double lacrimal canaliculus lacrimal duct support drainage tube, through the combination of an RS-type lacrimal duct drainage tube, a fixation cap, and a cannula, can be effectively fixed at the opening of the common lacrimal duct and the anastomosis site, providing support and expansion, improving the stability of the cannula's position, and effectively promoting the healing of the lacrimal sac mucosa and nasal mucosa epithelium, reducing the risk of recurrence. Compared with traditional silicone tubes, the design of this invention does not require knotting the silicone tube, reducing the foreign body sensation in the patient's nasal cavity, and also reducing the deposition and adhesion of secretions and toxic substances. Therefore, the technical solution of this invention has high clinical application value and promising prospects for promotion.

[0025] 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.

[0026] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the foregoing embodiments. The embodiments and descriptions in the specification are merely preferred examples and are not intended to limit the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. A lacrimal duct drainage stent suitable for traumatic dacryocystitis, comprising an RS-type lacrimal duct drainage tube, a fixation cap, and a sleeve, characterized in that: The drainage tube is 128mm long and consists of a thin middle section and thicker side sections. The middle section has a diameter of 0.5mm, and the side sections are hollow with an outer diameter of 1.5mm and an inner diameter of 0.5mm. There is a blue surgical reference mark in the middle of the drainage tube. Both ends of the drainage tube are closed blind ends, and there is a slit 50mm away from the apex of each blind end. A stainless steel probe is inserted into the drainage tube through the slit to guide the drainage tube into the lacrimal duct. The first snap-fit ​​structure is provided on the outer wall of both ends of the drainage tube at a distance of 45-50mm from the blind end; The fixing cap is a cylindrical structure with two hollow tubes with an inner diameter of 1.5 mm inside. The two hollow tubes form channels with an outer diameter equal to that of the two sides of the drainage tube. The fixing cap is 6-8 mm long and has an outer diameter of 4.5 mm. A disc-shaped structure is connected to the top of the fixing cap. The disc-shaped structure is an integral part of the fixing cap and has an outer diameter of 5.5 mm. The inner wall of the channel is provided with a channel buckle structure that matches and is fixed to the first buckle structure at 1mm intervals. The channel buckle structure is a recessed structure on the same annular surface of the inner wall of the channel. The outer wall of the fixing cap is provided with a fixing cap outer wall buckle structure for fixing with the sleeve at a distance of 1mm from the top; The sleeve is a hollow pipe with a length of 10mm, an inner diameter of 4.5mm, and an outer diameter of 5-6mm. The inner wall of the sleeve is provided with a sleeve buckle structure that engages and fixes with the buckle structure on the outer wall of the fixing cap 1mm from the top. The RS-type lacrimal duct drainage tube, fixation cap, and sheath are all made of medical-grade silicone material.

2. The lacrimal duct drainage stent for traumatic dacryocystitis according to claim 1, characterized in that: The fixing cap is configured to be fixed by engaging with the first snap-fit ​​structure on the outer wall of the two sides of the drainage tube through the channel snap-fit ​​structure, so that the two sides of the drainage tube are respectively fixed inside the two hollow tubes of the fixing cap.

3. The lacrimal duct drainage stent for traumatic dacryocystitis according to claim 1, characterized in that: The sleeve is configured to be fixed by the sleeve snap-fit ​​structure and the outer wall snap-fit ​​structure of the fixing cap, so that the sleeve is fitted and fixed to the outside of the fixing cap.

4. The lacrimal duct drainage stent for traumatic dacryocystitis according to claim 1, characterized in that: The disc-shaped structure is located at the top of the fixation cap and is configured to limit the installation position of the cannula and / or the fixation cap at the location from the opening of the common lacrimal duct to the dacryocystorhinostomy.

5. The lacrimal duct drainage stent for traumatic dacryocystitis according to claim 1, characterized in that: The slit is configured to allow the stainless steel probe to be inserted into both sides of the drainage tube, so that the stainless steel probe can pull the drainage tube sequentially through the lacrimal punctum, lacrimal canaliculus, common lacrimal duct and dacryocystorhinostomy.

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