Training aid for subretinal injection of the eye

Abstract

The utility model discloses a training teaching aid for subretinal injection eyeball, including base, eyeball model and syringe, the eyeball model of eyeball structure includes upper sclera and lower sclera, is connected through a plurality of magnetism and is inhaled between upper sclera and lower sclera, and the upper sclera is provided with puncture hole for the lower long needle of syringe to enter in the direction of two o'clock and ten o'clock respectively, is equipped with cornea on the upper sclera, is equipped with choroid on the inner wall of upper sclera and lower sclera, and the top of choroid is fixedly connected with ciliary muscle, and the end of ciliary muscle is fixedly connected with zonular band, and the end of zonular band is fixedly connected with lens, and the end of lens is equipped with pupil, and is equipped with aqueous humor between cornea and lens, and is equipped with retina on the inner wall of choroid, the utility model highly simulates the operation environment of real subretinal injection and carries out effective training, can grasp the technical points of subretinal injection, improves clinical operation ability and the eyeball model can simulate different eyeball pathological changes.

Description

Technical Field

[0001] This utility model relates to the field of training aids technology, specifically a training aid for subretinal injection of eyeballs. Background Technology

[0002] The retina plays a vital role in the eye. It is a key structure for vision formation, responsible for converting light signals into neural signals and transmitting them to the brain for processing. The main functions and roles of the retina are as follows: 1. Receiving and converting light signals; 2. Signal transmission and processing; 3. High-resolution vision; 4. Adapting to different lighting conditions; 5. Color vision; 6. Transmitting visual information to the brain. Damage to the retina can severely impair vision and even lead to blindness. Therefore, protecting retinal health is crucial for maintaining normal vision.

[0003] The retina is primarily composed of the neuroepithelial layer and the pigment epithelium layer. The neuroepithelial layer contains nine microstructures, including: the photoreceptor cell layer, the outer membrane, the outer nuclear layer, the outer reticular layer, the inner nuclear layer, the inner reticular layer, the ganglion cell layer, the nerve fiber layer, and the internal limiting membrane. These multiple layers of the retina work together to ensure the efficient conversion and transmission of light signals.

[0004] Some fundus diseases involving the photoreceptor cell layer or the retinal pigment epithelium, such as Leber's congenital amaurosis, retinitis pigmentosa, choroidal ischemic disease, and some gene therapies, require direct injection of drugs between the retinal neuroepithelial layer and the pigment epithelium. This is to precisely deliver the drugs, target the lesion area, reduce drug diffusion, and improve the success rate of gene therapy.

[0005] Subretinal injection surgery is quite difficult because the retina is an inner layer of the eyeball and the procedure must be performed inside the eye. Furthermore, the thickness of the retinal neuroepithelial layer is approximately 200–250 µm. Improper injection can lead to retinal hemorrhage, rupture, or even detachment. Therefore, highly precise operation is required. Currently, there is a lack of teaching aids for subretinal injection in clinical teaching. Utility Model Content

[0006] To address the shortcomings of existing technologies, this invention provides a training tool for subretinal injection of eyeballs, thus solving the aforementioned problems.

[0007] To achieve the above objectives, this utility model is implemented through the following technical solution: a training tool for subretinal injection of the eyeball, including a base, an eyeball model and a syringe; the eyeball model includes an upper sclera and a lower sclera, which are magnetically connected by multiple magnets, and the upper sclera has puncture holes at the two o'clock and ten o'clock positions for the lower needle of the syringe to enter.

[0008] The cornea is located on the superior sclera, and the choroid is located on the inner walls of both the superior and inferior sclera. The ciliary muscle is fixedly connected to the apex of the choroid, and the suspensory ligament is fixedly connected to the end of the ciliary muscle. The lens is fixedly connected to the end of the suspensory ligament, and the pupil is located at the end of the lens. Aqueous humor is located between the cornea and the lens. The retina is located on the inner wall of the choroid, and the vitreous humor is located inside the retina. The macula is located on the retina.

[0009] Preferably, the base includes a base plate and a screw rod, a support rod is fixedly connected to the top of the base plate, and the end of the support rod is provided with a threaded opening.

[0010] Preferably, the screw is matched with the threaded opening, and the lower sclera is fixedly connected to the screw.

[0011] Preferably, the eyeball model is made of transparent material, which facilitates training for students and allows assessors to see whether the students' operations are correct.

[0012] Preferably, the lens is disposed inside the superior sclera and the retina is disposed inside the inferior sclera, so that the retina can be easily replaced after the superior and inferior sclera are separated.

[0013] Preferably, the syringe includes a syringe body with a long needle attached thereon, and the long needle is used to inject the liquid of the simulated drug into the eyeball model.

[0014] Preferably, a limiting block is fitted onto the long needle head. The limiting block is made of rubber material and is used to limit the insertion depth of the long needle head to prevent excessive puncture.

[0015] The subretinal injection ocular training tool provided by this utility model has the following advantages compared with the prior art:

[0016] 1. This training tool for subretinal injection uses a base to fix an eye model, and a matching syringe is used for injection. The eye model can simulate various ocular diseases, providing a highly realistic training environment for subretinal injection. Through repeated practice, trainees can master the key techniques of subretinal injection and improve their clinical skills.

[0017] 2. This training tool for subretinal injection of the eyeball limits the insertion depth of the long needle by using a limiting block to prevent excessive puncture. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0019] Figure 2 This is a schematic diagram of the base structure of this utility model;

[0020] Figure 3 This is a schematic diagram of the cross-sectional structure of the eyeball model of this utility model;

[0021] Figure 4 This is a schematic diagram of the syringe structure of this utility model.

[0022] In the diagram: 1. Base; 101. Base plate; 102. Support rod; 103. Screw; 2. Eyeball model; 201. Inferior sclera; 202. Superior sclera; 203. Choroid; 204. Retina; 205. Ciliary muscle; 206. Suspension ligament; 207. Lens; 208. Pupil; 209. Aqueous humor; 210. Vitreous body; 211. Cornea; 212. Macula; 3. Syringe; 301. Syringe body; 302. Long needle; 303. Limiting block. Detailed Implementation

[0023] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0024] Please see Figure 1-4 The present invention provides a training tool for subretinal injection ocular lesions, including a base 1, an ocular model 2, and a syringe 3. The ocular model 2 is made of transparent material, which makes it convenient for trainees to train and allows examiners to see whether the students' operation is correct. The ocular model 2 can be fixed by the base 1, and the injection operation can be performed by the syringe 3. The ocular model 2 can simulate different ocular lesions, thereby effectively training for subretinal injection.

[0025] The eyeball model 2 described above has an outer shell made of silicone or resin to simulate the eyeball wall, with the cornea being transparent and the sclera being opaque.

[0026] Internal structure: The vitreous cavity is filled with a transparent gel to simulate the vitreous body.

[0027] Retinal layer: A thin, elastic material, such as a silicone membrane, is used to simulate the neuroepithelial and pigment epithelial layers of the retina.

[0028] Retinal layer: A thin layer of elastic material (such as a silicone membrane) is used to simulate the neuroepithelial and pigment epithelial layers of the retina. Macula: An area is marked on the retina to simulate the macula.

[0029] Detachable structure: facilitates replacement of the retinal layer or simulation of different diseases (such as retinal detachment, macular edema, etc.).

[0030] Simulates the neuroepithelial and pigment epithelial layers of the retina: ultra-thin, closely adhering to the eyeball wall, with interlayer gaps. Simulates the eyeball structure: includes the anterior chamber, iris, and lens.

[0031] The base 1 includes a base plate 101 and a screw 103. A support rod 102 is fixedly connected to the top of the base plate 101. The end of the support rod 102 is provided with a threaded opening. The screw 103 matches the threaded opening. The lower sclera 201 is fixedly connected to the screw 103, which makes it easy to replace the eyeball model 2.

[0032] The eyeball model 2 includes an upper sclera 202 and a lower sclera 201, both made of silicone or resin. The upper sclera 202 and lower sclera 201 are magnetically connected by multiple magnets, allowing for easy separation and opening of the upper sclera 202 and lower sclera 201 to facilitate replacement of the retina 204. The upper sclera 202 has two puncture holes, which serve as puncture points located at the two o'clock and ten o'clock positions, respectively. The orientation facilitates the insertion of the syringe 3. A cornea 211 is located on the superior sclera 202. A choroid 203 is located on the inner wall of both the superior sclera 202 and the inferior sclera 201. A ciliary muscle 205 is fixedly connected to the apex of the choroid 203, and a suspensory ligament 206 is fixedly connected to the end of the ciliary muscle 205. A lens 207 is fixedly connected to the end of the suspensory ligament 206. The lens 207 is located inside the superior sclera 202, and the retina 204 is located inside the inferior sclera 201. This design allows for easy replacement of the retina 204 after separating the superior sclera 202 and inferior sclera 201. The lens 207 has a pupil 208 at its end and an iris on one side, effectively simulating the eyeball. An aqueous humor 209 is located between the cornea 211 and the lens 207. The retina 204 is located on the inner wall of the choroid 203. The retina 204 is made of a similar material to the choroid 203, and the two can be fixed together by mutual friction and negative pressure, facilitating easy replacement of the retina 204 to simulate different lesions of the retina 204, such as retinal detachment or macular edema. The retina 204 is made of silicone membrane material, which can easily simulate the neuroepithelial layer and pigment epithelium of the retina 204. The vitreous humor 210 is located inside the retina 204 and is made of transparent gel material. The macula 212 is located on the retina 204.

[0033] The syringe 3 includes a syringe body 301 with a scale accurate to 0.01 ml for easy control of the injection volume. An ultra-fine, long needle 302, approximately 10–12 mm in length, is mounted on the syringe body 301. This long needle 302 is used to inject simulated drug liquid into the eyeball model 2, simulating a real subretinal injection needle. A limiting block 303, made of rubber, is fitted onto the long needle 302 to limit the insertion depth of the long needle 302, preventing excessive puncture. An optional pressure sensor can also be installed to simulate the injection pressure.

[0034] During operation, syringe 3 is used to draw up the stained liquid to simulate the drug. An ophthalmic microscope is used to observe the eyeball model 2. A puncture point is selected, and the needle is inserted perpendicularly to the upper sclera 202 and towards the center of the eyeball. The needle punctures the upper sclera 202 and enters the vitreous body 210. The long needle 302 is slowly advanced until it approaches the retina 204. The neuroepithelial layer of the retina 204 is gently punctured to enter the subretinal space of the retina 204. The drug is injected slowly to avoid excessive pressure that could cause retinal detachment. 0.01–0.05 mL of the simulated drug is injected slowly, and the diffusion of the fluid in the subretinal space of the retina 204 is observed. The long needle 302 is slowly withdrawn to observe whether there is fluid reflux or retinal detachment. The integrity of the retina 204 is checked, and the adhered retina 204 can be replaced to simulate different lesions of the retina 204, thereby effectively training the subretinal injection technique.

[0035] The above description is merely a preferred embodiment of this utility model. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principle of this utility model, and these improvements and modifications should also be considered within the scope of protection of this utility model. Structures, devices, and operating methods not specifically described or explained in this utility model, unless otherwise specified or limited, are implemented using conventional methods in the field and are considered prior art known to those skilled in the art.

Claims

1. A training tool for subretinal injection of ocular globules, characterized in that: The device includes an eyeball model (2) fixed on the surface of a base (1) and an syringe (3). The eyeball model (2) includes an upper sclera (202) and a lower sclera (201). The upper sclera (202) and the lower sclera (201) are magnetically connected by multiple magnets. The upper sclera (202) has puncture holes at the two o'clock and ten o'clock positions, respectively, for the lower needle (302) of the syringe (3) to enter.

2. The training tool for subretinal injection of ocular balls according to claim 1, characterized in that: The cornea (211) is provided on the superior sclera (202). The choroid (203) is provided on the inner wall of both the superior sclera (202) and the inferior sclera (201). The ciliary muscle (205) is fixedly connected to the top of the choroid (203). The suspensory ligament (206) is fixedly connected to the end of the ciliary muscle (205). The lens (207) is fixedly connected to the end of the suspensory ligament (206). The pupil (208) is provided at the end of the lens (207). Aqueous humor (209) is provided between the cornea (211) and the lens (207). The retina (204) is provided on the inner wall of the choroid (203). The vitreous body (210) is provided inside the retina (204). The macula (212) is provided on the retina (204).

3. The training tool for subretinal injection of ocular balls according to claim 1, characterized in that: The base (1) includes a support rod (102) fixedly connected to the base plate (101). The end of the support rod (102) is provided with a threaded opening that matches and is connected to the screw (103). The other end of the screw (103) is connected to the eyeball model (2).

4. The training aid for subretinal injection ocular balls according to claim 1, 2, or 3, characterized in that: The eyeball model (2) is made of transparent material.

5. The training tool for subretinal injection of ocular balls according to claim 2, characterized in that: The lens (207) is disposed inside the superior sclera (202), and the retina (204) is disposed inside the inferior sclera (201).

6. The training aid for subretinal injection of ocular balls according to claim 1, characterized in that: The syringe (3) includes a long needle (302) installed at the lower part of the syringe body (301), and a limiting block (303) is sleeved on the long needle (302).

7. The training aid for subretinal injection of ocular balls according to claim 6, characterized in that: The limiting block (303) is made of rubber material.

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