An ophthalmic puncture knife cannula

Abstract

This utility model relates to an ophthalmic puncture knife cannula, comprising: a cannula body, the cannula body including a capillary tube and a cannula tailstock formed at and communicating with the end of the capillary tube, the cannula tailstock including at least a tailstock body formed at the end of the capillary tube, a through cavity formed in the tailstock body and communicating with the capillary tube, and a limiting groove formed on the inner wall of the tailstock body and cooperating with the through cavity; and a self-closing cap, the self-closing cap including an insert sleeve disposed in the through cavity, a snap-fit ​​sleeve formed at the end of the insert sleeve and cooperating with the limiting groove, and a thin film formed in the insert sleeve or the snap-fit ​​sleeve. This design prevents the self-closing cap from separating from the cannula body during cleaning and sterilization, thus avoiding the self-closing cap falling off during cleaning.

Description

Technical Field

[0001] This utility model belongs to the field of medical device technology, specifically relating to a puncture cannula, and more specifically to an ophthalmic puncture knife cannula. Background Technology

[0002] A puncture knife (i.e., a puncture device) is a precision instrument used for minimally invasive procedures. It is mainly used to create incisions and enter specific areas of the eye (such as the anterior chamber or vitreous cavity) while reducing tissue damage and postoperative complications. It is usually made of stainless steel or polymer materials, and the front end is designed to be blunt or sharp, which can be selected according to the needs of the surgery. The core functions of the puncture knife are: (1) Precise incision: The puncture device enters the eye through a very small incision (usually less than 3 mm), avoiding the traction damage to surrounding tissues caused by traditional scalpels. It is especially suitable for delicate surgeries such as phacoemulsification of cataracts and vitrectomy; (2) Maintaining the operating channel: Some puncture devices are equipped with cannulas or valves, which can maintain stable intraocular pressure during the operation, prevent fluid leakage, and provide a fixed passage for the instrument to enter and exit.

[0003] Chinese utility model patent application number 202321784238.9 discloses a sleeve for creating a microchannel to protect internal pressure. The sleeve is cylindrical, with a connecting portion at one end. Both the sleeve and the connecting portion are hollow and interconnected, forming a single, integral structure. A sleeve valve is installed at one end of the sleeve. This application, by incorporating the sleeve and valve, allows for separation of the sleeve and the sleeve when the sleeve is inserted into the eye by a puncture knife. The valve blocks the through-hole of the sleeve, ensuring internal eye pressure. This reduces damage to intraocular tissues and the number of wounds caused by repeated instrument insertion during ophthalmic surgery, while also reducing the difficulty of the surgeon's operation, alleviating patient suffering, and enabling minimally invasive surgical treatment for faster recovery. However, this application requires a complex sleeve valve, which is prone to falling off during cleaning. Summary of the Invention

[0004] The purpose of this invention is to overcome the shortcomings of the existing technology and provide an ophthalmic puncture knife cannula.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is: an ophthalmic puncture knife cannula, comprising:

[0006] The sleeve body includes a capillary tube and a sleeve tail seat formed at the end of the capillary tube and connected thereto. The sleeve tail seat includes at least a tail seat body formed at the end of the capillary tube, a through cavity opened in the tail seat body and connected to the capillary tube, and a limiting groove opened on the inner wall of the tail seat body and cooperating with the through cavity.

[0007] The self-closing cap includes a plug sleeve disposed in the through cavity, a snap-fit ​​sleeve formed at the end of the plug sleeve and cooperating with the limiting groove, and a thin film formed in the plug sleeve or the snap-fit ​​sleeve.

[0008] Ideally, the self-closing cap is made of silicone.

[0009] Furthermore, the thickness of the film is 0.1~0.4 mm.

[0010] Ideally, the capillary has a wall thickness of 0.02 mm to 0.08 mm and an outer diameter of ≤ 0.8 mm.

[0011] Furthermore, the outer surface of the capillary is divided into two regions with different roughnesses: the region closer to the self-closing cap is the first region, and the region farther from the self-closing cap is the second region. The roughness of the second region is ≤0.8μm, and the roughness of the first region is ≥1.6μm.

[0012] Furthermore, the width of the first region is 1.5~2mm.

[0013] Ideally, the sleeve tailstock also includes a clamping groove formed on the circumferential surface of the tailstock body.

[0014] Ideally, the plug sleeve includes a first body and a first through hole at the center of the first body.

[0015] Furthermore, the snap-fit ​​sleeve includes a second body formed at the end of the first body, a limiting protrusion formed on the outer peripheral surface of the second body and cooperating with the limiting groove, and a second through hole formed at the center of the second body and communicating with the first through hole, wherein the thin film is formed in the first through hole or the second through hole.

[0016] Due to the application of the above technical solution, this utility model has the following advantages compared with the prior art: The ophthalmic puncture knife cannula of this utility model has a self-closing cap of a specific structure embedded in the cannula body of a specific structure, so that the self-closing cap is tightly attached to the cannula body by its own elasticity. In this way, the self-closing cap cannot be separated from the cannula body during the cleaning and sterilization process, thus avoiding the self-closing cap from falling off during the cleaning process. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of the ophthalmic puncture knife sheath of this utility model;

[0018] Figure 2 This is a schematic diagram of the structure of the cannula body in the ophthalmic puncture knife cannula of this utility model;

[0019] Figure 3 This is a schematic diagram of the self-closing cap in the ophthalmic puncture knife cannula of this utility model;

[0020] Figure 4 for Figure 3 A sectional view. Detailed Implementation

[0021] The present invention will be further described below with reference to the embodiments shown in the accompanying drawings.

[0022] like Figure 1 The ophthalmic puncture knife cannula shown mainly includes a matching cannula body 1 and a self-closing cap 2.

[0023] Among them, the casing body 1 is as follows Figure 2 As shown, it includes a capillary tube 11 and a sleeve tailstock 12 (usually integrally formed) formed at and connected to the end of the capillary tube 11. The sleeve tailstock 12 includes at least a tailstock body 121 formed at the end of the capillary tube 11, a through cavity 123 formed in the tailstock body 121 and connected to the capillary tube 11, and a limiting groove 124 formed on the inner wall of the tailstock body 121 and cooperating with the through cavity 123 (i.e., the limiting groove 124 is connected to the through cavity 123 to form a complete inner wall structure of the tailstock body 121, such as...). Figure 2 (As shown).

[0024] The self-closing cap 2 includes an insertion sleeve 21 disposed within the through cavity 123, a snap-fit ​​sleeve 22 formed at the end of the insertion sleeve 21 and engaging with the limiting groove 124, and a thin film 23 formed within the insertion sleeve 21 or the snap-fit ​​sleeve 22. Thus, relying on the elasticity of the self-closing cap 2 itself, it fits tightly against the inner wall of the cannula tail seat 12 of the cannula body 1, preventing separation of the self-closing cap 2 from the cannula tail seat 12 during cleaning and sterilization. This makes it more suitable for use with reusable puncture knives (such as...). Figure 3 and Figure 4 (As shown).

[0025] In this embodiment, the self-closing cap 2 is preferably made of silicone; the thickness of the film 23 is 0.1~0.4mm. When in use, the puncture knife pierces the film 23 and passes through the ophthalmic puncture knife cannula. When the puncture knife is pulled out, the silicone closes the hole (the hole through which the puncture knife passes) due to its own elasticity.

[0026] In this embodiment, the capillary 11 has a wall thickness of 0.02 mm to 0.08 mm and an outer diameter of ≤0.8 mm. The outer surface of the capillary 11 is preferably divided into two regions with different roughness (smoothness): the region closer to the self-closing cap 2 is designated as the first region a, and the region farther from the self-closing cap 2 is designated as the second region b. The roughness of the second region b is ≤0.8 μm, and the roughness of the first region a is ≥1.6 μm (the width of the first region a is 1.5 to 2 mm). The ophthalmic puncture knife is used in ophthalmic surgery to open an incision at the limbus of the eyeball. It consists of an ophthalmic puncture knife cannula and a blade. The ophthalmic puncture knife cannula is fitted over the blade, and the outer diameter of the cannula is slightly larger than the diameter of the blade. During use, the blade pierces the limbus and is then withdrawn from the ophthalmic puncture knife cannula, leaving the cannula inside the limbus incision. The cannula body 1's tailstock 12 protrudes outside the limbus. To prevent aqueous humor leakage, a self-closing cap 2 is installed inside the tailstock 12. All instruments that need to be inserted into the eyeball during surgery must pass through the ophthalmic puncture knife cannula, thus minimizing ocular surface trauma and promoting rapid postoperative recovery for the patient. When the capillary 11 is in areas with different roughness, the capillary 11 of the cannula body 1, after being inserted into the ocular incision, can be fixed to the eyeball by its own friction.

[0027] In this embodiment, the cannula tailstock 12 also includes a clamping groove 122 formed on the circumferential surface of the tailstock body 121; that is, the cannula tailstock 12 is a relatively thick-walled tube with an inward groove (i.e., clamping groove 122) on the outer circumference of the outer wall, which facilitates instrument clamping.

[0028] The plug sleeve 21 includes a first body 211 and a first through hole 210 (the first through hole 210 is a through hole coaxial with the first body 211) opened at the center of the first body 211. The snap-fit ​​sleeve 22 includes a second body 221 formed at the end of the first body 211, a limiting protrusion 222 formed on the outer circumferential surface of the second body 221 and cooperating with the limiting groove 124, and a second through hole 223 opened at the center of the second body 221 and connected to the first through hole 210. The film 23 is formed in the first through hole 210 or the second through hole 223 (but preferably formed in the first through hole 210 and perpendicular to its axis). That is, there is also a groove (i.e., limiting groove 124) on the inner wall of the tailstock body 121, which is used to cooperate with the through cavity 123 to install the self-closing cap 2, so that the self-closing cap 2 is tightly fitted to the inner wall of the tailstock body 121 by its own elasticity (the outer wall of the self-closing cap 2 cooperates with the inner wall of the tailstock body 121), further preventing the self-closing cap from falling off during the cleaning process.

[0029] The above embodiments are only for illustrating the technical concept and features of this utility model, and are intended to enable those skilled in the art to understand the content of this utility model and implement it accordingly. They should not be construed as limiting the scope of protection of this utility model. All equivalent changes or modifications made in accordance with the spirit and essence of this utility model should be included within the scope of protection of this utility model.

Claims

1. An ophthalmic puncture knife cannula, characterized in that it include: The sleeve body (1) includes a capillary tube (11) and a sleeve tail seat (12) formed at the end of the capillary tube (11) and connected thereto. The sleeve tail seat (12) includes at least a tail seat body (121) formed at the end of the capillary tube (11), a through cavity (123) opened in the tail seat body (121) and connected to the capillary tube (11), and a limiting groove (124) opened on the inner wall of the tail seat body (121) and cooperating with the through cavity (123). The self-closing cap (2) includes a plug sleeve (21) disposed in the through cavity (123), a snap sleeve (22) formed at the end of the plug sleeve (21) and cooperating with the limiting groove (124), and a thin film (23) formed in the plug sleeve (21) or the snap sleeve (22).

2. The ophthalmic puncture knife cannula according to claim 1, characterized in that: The self-closing cap (2) is made of silicone.

3. The ophthalmic puncture knife cannula according to claim 1 or 2, characterized in that: The thickness of the film (23) is 0.1~0.4 mm.

4. The ophthalmic puncture knife cannula according to claim 1, characterized in that: The capillary (11) has a wall thickness of 0.02mm~0.08mm and an outer diameter of ≤0.8mm.

5. The ophthalmic puncture knife cannula according to claim 1 or 4, characterized in that: The outer surface of the capillary (11) is divided into two regions with different roughnesses. The region closer to the self-closing cap (2) is the first region (a), and the region farther away from the self-closing cap (2) is the second region (b). The roughness of the second region (b) is ≤0.8μm, and the roughness of the first region (a) is ≥1.6μm.

6. The ophthalmic puncture knife cannula according to claim 5, characterized in that: The width of the first region (a) is 1.5~2mm.

7. The ophthalmic puncture knife cannula according to claim 1, characterized in that: The sleeve tailstock (12) also includes a clamping groove (122) formed on the circumferential surface of the tailstock body (121).

8. The ophthalmic puncture knife cannula according to claim 1, characterized in that: The plug sleeve (21) includes a first body (211) and a first through hole (210) opened at the center of the first body (211).

9. The ophthalmic puncture knife cannula according to claim 8, characterized in that: The snap-fit ​​sleeve (22) includes a second body (221) formed at the end of the first body (211), a limiting protrusion (222) formed on the outer peripheral surface of the second body (221) and cooperating with the limiting groove (124), and a second through hole (223) opened at the center of the second body (221) and communicating with the first through hole (210). The film (23) is formed in the first through hole (210) or the second through hole (223).

Images