Sclera puncture cannula for subretinal injection

Abstract

The utility model relates to a sclera puncture cannula for subretinal injection, which comprises a cannula body and a puncture needle, a puncture channel is arranged inside the cannula body, the puncture needle is matched with the puncture channel in inner diameter, a guide base is arranged at one end of the cannula body, the guide base is in a cylindrical shape, and the puncture needle is arranged on the guide base. An inverted-cone-shaped guide groove is formed in the guide base, the tail end of the guide groove is smoothly connected with the inlet end of the puncture channel, the bottom face of the end, close to the cannula body, of the guide base is attached to the sclera, and the surface of the guide base emits fluorescence. On the basis that the sleeve body emits light, the bottom area of the sleeve body is expanded, so that the sleeve body is better attached to the surface of the sclera, and shaking is prevented; meanwhile, the guide groove is arranged to be in an inverted cone shape, the open end is expanded, the tail end is smoothly connected with the puncture channel, the phenomenon that a needle abuts against the surface of the puncture cannula when a surgeon punctures is avoided, peripheral eyeball wall tissue is protected, and iatrogenic injuries are avoided.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of ophthalmic medical apparatus and instruments, in particular to a scleral puncture cannula for subretinal injection. BACKGROUND

[0002] Subretinal injection is a surgical technique for treating fundus diseases. During operation, the scleral puncture cannula is used to puncture and fix the eyeball wall about 2mm-2.5mm behind the limbus sclerae to establish a scleral tunnel, and then the injection needle is sent into the eye through the scleral tunnel to perform subretinal injection at a specific site. Since subretinal injection is difficult to operate and exceeds the physiological limit of human hands, this technique has been difficult to promote and apply widely.

[0003] Patent CN213641554U discloses a cannula for an ocular treatment device, which increases the observation range of medical personnel during surgery by the light-emitting collar arranged in the cannula for the ocular treatment device, assists the medical personnel in observing the surgical situation during surgery, and thus enables the medical personnel to accurately and quickly insert the ocular treatment device into the eye through the cannula without repeatedly opening the microscope for illumination or opening the indoor light to assist the surgery. In recent years, with the development and application of ophthalmic surgical robots, subretinal injection assisted by robots can greatly reduce the difficulty of the surgery, but in actual operation, the subretinal injection needle needs to be manually sent into the eye through the puncture cannula first, and then the surgical robot is used to assist in subretinal injection. The commonly used scleral puncture cannula for current ophthalmic surgical operation has specifications of 23G, 25G, and 27G, and the scleral tunnel established by the puncture cannula is cylindrical with a diameter of only about 0.4-0.6mm, while the specification of the subretinal injection needle is usually above 41G with a diameter of about 90um or less, which can cause the needle to bend and thus cannot be used when encountering slight resistance. It is difficult for the surgeon to deliver the injection needle through the puncture cannula, and it is very easy to cause the bending or breaking of the needle, thereby affecting the normal progress of the surgery. UTILITY MODEL CONTENTS

[0004] The utility model solves the technical problem of providing a scleral puncture cannula for subretinal injection, which guides the surgical instruments such as the subretinal injection needle and improves the accuracy of the surgical instruments entering the scleral tunnel in the cannula.

[0005] The utility model discloses a technical scheme adopted for solving its technical problems is: provide a kind of for subretinal injection scleral puncture cannula, including the cannula body of the puncture channel being opened in inside and the puncture needle being matched with the inner diameter of the puncture channel, one end of the cannula body is equipped with guide base, the appearance of guide base is cylindrical, the guide groove of inverted cone is opened in the inside of guide base, the end of guide groove is smoothly connected with the import end of puncture channel, the end surface of guide base is close to the sclera of one end of cannula body, the surface of guide base emits fluorescence.

[0006] Wherein, the surface of guide base is equipped with fluorescent band.

[0007] Or, the surface of guide base is equipped with fluorescent coating.

[0008] Or, the guide base is fluorescent material.

[0009] Preferably, the material of guide base is medical silica gel.

[0010] Preferably, the material of cannula body is polyimide.

[0011] Preferably, the outer diameter of guide base is 2-5 times of the outer diameter of cannula body.

[0012] Preferably, the taper of guide groove is 1:1-1:3.

[0013] Preferably, the surface of guide groove is equipped with the guide line of protrusion, the guide line is in the same plane with the axis of guide groove.

[0014] Preferably, the guide line extends to the surface of puncture channel, and the surface of the end head of ophthalmic surgical instrument is equipped with the groove matched with the guide line.

[0015] Beneficial effects

[0016] The utility model discloses the basis on the light emission of cannula body, extends the bottom area of cannula body, so that it better with sclera surface is combined, prevents shaking, guide groove is set as inverted cone simultaneously, expands import end and connects end with puncture channel smoothly, avoids the needle head of surgeon when puncturing because of puncture cannula surface, protects the eyeball wall tissue of periphery, avoids causing nosocomial injury, or leads to needle head bending or breaking, improves surgical efficiency and precision.

[0017] The scleral puncture cannula is a necessary surgical instrument for vitrectomy, subretinal injection and other fundus surgeries. The scleral puncture cannula provided by the utility model uses a fluorescent material shell, which is convenient for surgeons to determine the position of the puncture cannula in a dark environment, and smoothly replace surgical instruments, so as to reduce iatrogenic injury caused by surgical instruments; the funnel-shaped pipeline structure design can enlarge the inlet of the puncture cannula, facilitate the entry of surgical instruments into the eye, effectively reduce the breakage of fine injection needles, and the cylindrical design of the ball wall section cannula has the same diameter as the puncture port, so that the ball wall section cannula can be effectively fixed in the eyeball wall tissue and is also convenient to remove; the medical silica gel material used for the inlet of the cannula is relatively soft, and is not easy to break the fine injection needles and other surgical instruments; the medical polyimide material used for the inner wall section of the cannula has high hardness and strong safety, is not easy to break, can protect the surrounding tissue, and is convenient for the movement of surgical instruments; finally, the device is simple to operate, can improve the surgical efficiency, and reduce iatrogenic injury. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 It is a combined perspective view of a scleral puncture cannula for subretinal injection.

[0019] Figure 2 It is Figure 1 It is a perspective enlarged view of the scleral puncture cannula embodiment one.

[0020] Figure 3 It is a top view of the scleral puncture cannula embodiment two.

[0021] Figure 4 It is Figure 1 It is a use schematic view of the scleral puncture cannula.

[0022] Among them, 1-puncture needle; 2-guide base; 3-cannula body; 4-guide groove; 5-guide line.

[0023] The same reference signs in the various figures represent the same components. DETAILED DESCRIPTION

[0024] The utility model will be further described below in combination with specific embodiments. It should be understood that these embodiments are only used to illustrate the utility model and are not used to limit the scope of the utility model. In addition, it should be understood that after reading the content taught by the utility model, those skilled in the art can make various changes or modifications to the utility model, and these equivalent forms also fall within the scope defined by the appended claims of the present application.

[0025] As Figure 1 , 2As shown in the utility model provides a kind of sclera puncture cannula for subretinal injection, including the cannula body 3 with puncture channel inside and puncture needle 1 with the puncture channel inner diameter, the one end of the cannula body 3 is equipped with guide base 2, the appearance of guide base 2 is cylindrical, guide groove 4 of inverted cone is opened inside guide base 2, the end of guide groove 4 is smoothly connected with the inlet end of puncture channel, the end surface of guide base 2 is attached to sclera close to the one end of cannula body 3, the surface of guide base 2 emits fluorescence.

[0026] The inverted cone guide groove 4 is funnel-shaped when used, and its lower end is directly connected with the puncture channel and smoothly transitions. The transition section can be provided with a rounded corner to further improve the guiding effect. The material of the guide base 2 is medical silicone, which is relatively soft and can protect the puncture needle 1 and the subretinal injection needle and other surgical instruments from bending or breaking.

[0027] The guide base 2 surface can emit fluorescence by providing a fluorescent band on the surface of the guide base 2, or coating a fluorescent coating on the surface of the guide base 2, or directly incorporating fluorescent materials into the material of the guide base 2, which facilitates the surgeon to determine the position of the puncture cannula in a dark environment,

[0028] Preferably, the material of the cannula body 3 is polyimide, which has high strength and is not easy to break, thus having high safety and effectively supporting the intraocular movement of surgical instruments to protect the eyeball wall tissue.

[0029] The outer diameter of the guide base 2 is 2-5 times the outer diameter of the cannula body 3. In a specific embodiment, the outer diameter of the guide base 2 is 3 times the outer diameter of the cannula body 3, so that the bottom surface of the guide base 2 can better attach to the surface of the sclera, improving stability and preventing the guide base 2 from shaking during surgery, causing the puncture cannula to shake together.

[0030] The taper of the guide groove 4 is 1:1-1:3. In a specific embodiment, the taper of the guide groove 4 is 1:1.7, which significantly enlarges the cannula inlet diameter, facilitating the smooth entry of surgical instruments into the cannula.

[0031] In a specific embodiment, as shown in the utility model, Figure 3 As shown in the utility model, the surface of the guide groove 4 is provided with a protruding guide line 5, and the guide line 5 is in the same plane as the axis of the guide groove 4, with at least one number. The color of the guide line 5 is selected to be the opposite color of the fluorescent color of the guide base 2 or directly selected to be black, which can enable the surgeon to clearly determine the entry direction of the surgical instruments.

[0032] Further, the guide line 5 extends to the surface of the puncture channel, and the end surface of the puncture needle 1 and the ophthalmic surgical instrument such as a needle head for subretinal injection is provided with a groove matched with the guide line 5. Correspondingly, the groove can be of the same color as the guide line 5, so that the surgeon can accurately align the groove on the surgical instrument with the guide line 5.

[0033] In other embodiments, the guide line 5 on the surface of the guide base 2 can be replaced by a guide groove, and correspondingly, the end surface of the surgical instrument can or can not be provided with a protruding guide line, which can have the same effect as the design of Embodiment Two.

[0034] As shown in Figure 4 When used, the utility model is inserted into the eyeball wall about 2mm-2.5mm after the limbus of eyeball, after seeing the sleeve fixed on the eyeball wall, the puncture needle 1 is pulled out, and the surgical instrument can be sent into the eyeball to work.

Claims

1. A scleral puncture cannula for subretinal injection comprising a cannula body having a puncture channel formed therein and a puncture needle having an inner diameter corresponding to the inner diameter of the puncture channel, characterized in that, One end of the sleeve body is provided with a guide base, the guide base is cylindrical in shape, a reverse tapered guide groove is formed in the guide base, the end of the guide groove is smoothly connected with the inlet end of the puncture channel, the bottom surface of the guide base near the one end of the sleeve body is attached to the sclera, and the surface of the guide base emits fluorescence.

2. A scleral puncture cannula for subretinal injection according to claim 1, wherein The surface of the guide base is provided with a fluorescent band.

3. A scleral puncture cannula for subretinal injection according to claim 1, wherein The surface of the guide base is provided with a fluorescent coating.

4. The scleral puncture cannula for subretinal injection according to claim 1, wherein, The guide base is made of fluorescent material.

5. The scleral puncture cannula for subretinal injection according to claim 1, wherein, The material of the guide base is medical silica gel.

6. A scleral puncture cannula for subretinal injection according to claim 1, wherein The material of the sleeve body is polyimide.

7. The scleral puncture cannula for subretinal injection according to claim 1, wherein, The outer diameter of the guide base is 2-5 times of the outer diameter of the sleeve body.

8. The scleral puncture cannula for subretinal injection according to claim 1, wherein, The taper of the guide groove is 1:1-1:

3.

9. The scleral puncture cannula for subretinal injection according to claim 1, wherein, The surface of the guide groove is provided with a raised guide line, and the guide line is in the same plane as the axis of the guide groove.

10. A scleral puncture cannula for subretinal injection according to claim 9, wherein, The guide line extends to the surface of the puncture channel, and the end surface of the puncture needle and the ophthalmic surgical instrument is provided with a groove matched with the guide line.

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