A lacrimal duct drainage device and a method for preparing the same

Abstract

The present invention discloses a lacrimal drainage device and a preparation method thereof, wherein the lacrimal drainage device comprises a hollow pipe, one end of the hollow pipe is provided with a curved section, the curved section is connected with a retaining portion for preventing the entire lacrimal duct from sinking, and the other end of the hollow pipe is provided with a drainage section for preventing tear blockage. The method comprises: preparing a hollow pipe, inserting a core rod from one end of the hollow pipe, then bending one end of the hollow pipe to prepare the curved section, and then taking out the core rod; connecting a retaining portion having a cross-sectional diameter greater than the cross-sectional diameter of the hollow pipe to the end of the curved section; and performing vertical or oblique laser cutting on the other end of the hollow pipe to form a drainage section. The curved section of the present invention is more adapted to the physiological structure of the human body, and together with the retaining portion, plays a role in preventing sinking, and the drainage section at the end can prevent blockage to a large extent. The preparation method of the device is simple, high in precision, and can be mass-produced.

Description

Technical Field

[0001] The invention relates to an ophthalmic medical device and a preparation method thereof, and in particular to a lacrimal duct drainage device and a preparation method thereof. Background Art

[0002] At present, metal tear duct implants are used clinically, but the existing metal tear duct implants have a relatively simple structure and are mostly straight-line in shape, which does not conform to the physiological structure of the human body. At the same time, the tear duct implants are prone to blockage and sinking after implantation in the human body, and the clinical effect needs to be improved. In addition, the preparation methods of existing tear duct implants are rarely reported. Some tear duct implants are made by clinicians based on their experience, using injection needles to cut off the straight part of the stainless steel tube of the needle. This method has low precision and is difficult to achieve mass production and large-scale use. Summary of the invention

[0003] Purpose of the invention: The purpose of the present invention is to provide a tear duct drainage device that is not easy to sink and is not easy to be blocked;

[0004] Another object of the present invention is to provide a method for preparing a lacrimal duct drainage device.

[0005] Technical solution: The lacrimal duct drainage device described in the present invention includes a hollow tube, one end of which is provided with a curved section, the curved section is connected to a retaining portion to prevent the entire lacrimal duct drainage device from sinking, and the other end of the hollow tube is provided with a drainage section for preventing tear blockage.

[0006] Preferably, the curvature of the curved section is 140-160°. The curvature angle adapts to the physiological structure of the human eye and nasal cavity, can better drain tears from the eye to the nasal cavity, and can also play a certain role in preventing the lacrimal duct from sinking.

[0007] Preferably, the drainage section is a notch section formed by vertical or oblique cutting on the surface of the hollow pipe.

[0008] Preferably, the length of the drainage section is 2-5 mm. The incision of the drainage section can increase the cross-sectional area at the outlet of the end of the lacrimal duct implant tube to prevent the end of the lacrimal duct implant tube from being blocked. The length of the drainage section matches the diameter of the lacrimal duct implant tube. When the length is less than 2 mm, the anti-blocking effect is weak. When the length is greater than 5 mm, due to the small diameter of the lacrimal duct implant tube itself, the anti-blocking effect is weakened if the drainage section length is further increased.

[0009] Preferably, the retaining portion is a baffle having a cross-sectional diameter greater than a cross-sectional diameter of the hollow pipe.

[0010] Preferably, a through hole for draining tear fluid is provided on the side wall of the drainage section.

[0011] Preferably, the inclination of the oblique cutting is 8-20° with the horizontal angle. The oblique cutting can increase the cross-sectional area at the outlet of the end of the lacrimal duct artificial tube and prevent the end of the lacrimal duct artificial tube from being blocked. The inclination of the oblique cutting matches the diameter of the lacrimal duct artificial tube. When the inclination is greater than 20°, the anti-blocking effect is weak. When the inclination is less than 8°, since the diameter of the lacrimal duct artificial tube itself is small, the anti-blocking effect is weakened if the inclination is further reduced.

[0012] Preferably, the blocking piece is oval.

[0013] The preparation method of the above-mentioned lacrimal duct drainage device comprises the following steps:

[0014] (A) preparing a hollow pipe, inserting a mandrel from one end of the hollow pipe, then bending one end of the hollow pipe to prepare a bent section, and then taking out the mandrel;

[0015] (B) connecting a retaining portion having a cross-sectional diameter greater than the cross-sectional diameter of the hollow pipe to an end of the curved section;

[0016] (C) The other end of the hollow tube is laser cut vertically or obliquely to form a drainage section.

[0017] Preferably, after step (C), the side wall of the drainage section is laser punched to obtain a through hole for draining tear fluid.

[0018] Beneficial effects: Compared with the prior art, the present invention has achieved the following significant effects: 1. The curved section on the tear duct drainage device is more suitable for the physiological structure of the human body, and on the other hand, it plays a role in preventing sinking together with the retaining part, and the drainage section at the end of the tear duct drainage device can prevent blockage to a large extent; 2. The incision and small hole are opened at the end of the tear duct drainage device, which also increases the effect of draining tears and preventing blockage. 3. The preparation method of the device is simple, high-precision, and can be mass-produced. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic structural diagram of a lacrimal duct drainage device with a vertical incision according to the present invention;

[0020] Figure 2 It is a schematic structural diagram of a lacrimal duct drainage device with an oblique incision according to the present invention;

[0021] Figure 3 It is a schematic structural diagram of the retaining part of the present invention. DETAILED DESCRIPTION

[0022] The present invention is further described in detail below in conjunction with the accompanying drawings.

[0023] like Figure 1As shown, the present invention discloses a lacrimal drainage device, comprising a hollow pipe 1, the hollow pipe 1 is made of stainless steel; a curved section 2 is provided at one end of the hollow pipe 1, the curvature of the curved section 2 is 150°, and the curvature of the curved section 2 is preferably between 140-160°; the curved section 2 is connected to a retaining portion 3 for preventing the entire lacrimal drainage device from sinking, a weld 7 is provided between the retaining portion 3 and the curved section 2, and the retaining portion 3 is a baffle having a diameter greater than that of the hollow pipe 1, as shown in FIG. Figure 3 As shown, the baffle in this embodiment is oval, and can also be other shapes; the other end of the hollow tube 1 is provided with a drainage section 4 for preventing tear blockage, and the drainage section 4 is a notch section formed by vertical cutting on the surface of the hollow tube 1, and can also be a notch section formed by oblique cutting on the surface of the hollow tube 1, such as Figure 2 As shown, the inclination of the oblique cutting is 10° with the horizontal, preferably 8-20°; the incision after laser cutting will form a right angle sharp corner, which is ground into a rounded corner 6 to prevent scratching the human body; the length of the drainage section 4 is 4mm, preferably in the range of 2-5mm. In this embodiment, a through hole 5 for draining tear fluid is also opened on the side wall of the drainage section 4.

[0024] The preparation method of the above-mentioned lacrimal duct drainage device comprises the following steps:

[0025] (1) First, a stainless steel hollow pipe 1 is prepared, a mandrel is inserted from one end of the hollow pipe 1, and then one end of the hollow pipe 1 is bent by a pipe bender to prepare a bent section 2, and then the mandrel is taken out;

[0026] (2) an elliptical baffle having a cross-sectional diameter larger than that of the hollow pipe 1 is laser welded to the end of the curved section 2, with a weld 7 being formed between the elliptical baffle and the curved section 2;

[0027] (3) A position 4 mm from the other end of the hollow tube 1 is taken, and the hollow tube 1 is vertically cut to the axial position of the hollow tube 1 by laser to form a drainage section 4. The incision after laser cutting will form a right-angle sharp corner, which is ground into a rounded corner 6 to prevent scratching the human body; the side wall of the drainage section 4 is laser punched to obtain a through hole 5 for draining tears.

Claims

1. A lacrimal duct drainage device, characterized in that: The invention comprises a hollow tube (1), wherein one end of the hollow tube (1) is provided with a curved section (2), the curved section (2) is connected to a retaining portion (3) for preventing the entire lacrimal duct drainage device from sinking, and the other end of the hollow tube (1) is provided with a drainage section (4) for preventing tear blockage; the curvature of the curved section (2) is 140-160°; the drainage section (4) is a notch section formed by oblique cutting on the surface of the hollow tube (1); the oblique cutting is to the axial position of the hollow tube (1); the inclination of the oblique cutting is 8-20° with the horizontal; the length of the drainage section (4) is 2-5 mm; the retaining portion (3) is a baffle having a cross-sectional diameter larger than the cross-sectional diameter of the hollow tube (1); and a through hole (5) for draining tear liquid is provided on the side wall of the drainage section (4).

2. The lacrimal drainage device according to claim 1, characterized in that: The blocking piece is oval.

3. A method for preparing the lacrimal drainage device according to claim 1, characterized in that: The following steps are involved: (A) preparing a hollow pipe (1), inserting a mandrel into one end of the hollow pipe (1), then bending one end of the hollow pipe (1) to prepare a bent section (2), and then removing the mandrel; (B) connecting a retaining portion (3) having a cross-sectional diameter greater than the cross-sectional diameter of the hollow pipe (1) to the end of the curved section (2); (C) The other end of the hollow pipe (1) is laser cut vertically or obliquely to form a drainage section (4).

4. The method for preparing the lacrimal drainage device according to claim 3, characterized in that: After step (C), the side wall of the drainage section (4) is perforated by laser to obtain a through hole (5) for draining tear fluid.

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