Novel vitreous cavity injector capable of being positioned

Abstract

The utility model discloses a novel vitreous cavity injector capable of being positioned, which comprises a guiding and positioning mechanism and an injector, the guiding and positioning mechanism comprises an outer cylinder and a positioning ring, the positioning ring is arranged at the front end of the outer cylinder, the positioning ring and the outer cylinder are of an integrated structure which is concentrically arranged, and a concentric annular silica gel gasket is arranged on the front end face of the positioning ring. The silica gel gasket is positioned on the flat part of the ciliary body behind the cornea sclera edge of the eyeball of the patient; and a metal needle catheter is arranged in the center of the front end surface of the outer cylinder. The silica gel gasket of the positioning ring at the front end of the outer cylinder is tightly attached to the cornea sclera edge and makes flexible contact with the eyeball, and the needle head can be directly positioned on the flat portion of the ciliary body of a patient; after the needle head is inserted into the eyeball of a patient, the positioning ring at the front end of the outer cylinder provides certain supporting force, so that unnecessary damage to the eyeball of the patient caused by shaking of the hand, slippage of the needle head and the like during medicine injection is prevented; the positioning ring is suitable for the outer diameter radians of various eyeballs, and can accurately position a 4 mm injection point behind the corneal limbus.

Description

Technical Field

[0001] The utility model relates to the technical field of medical devices, in particular to a novel positionable vitreous cavity injector. Background Art

[0002] In the treatment of some intraocular diseases, such as retinal diseases like macular edema caused by various reasons, due to the special characteristics of the eye, it is difficult to achieve the required blood drug concentration through systemic medication (oral or intravenous administration), topical eye drops, or eye ointments, thereby affecting the therapeutic effect or even failing to achieve the purpose of treating the disease. Vitreous drug injection can effectively solve this problem. Therefore, vitreous drug injection plays a very important role in the treatment of some intraocular diseases, especially retinal diseases.

[0003] In clinical practice, intravitreal drug injections typically use a standard 1ml syringe. Doctors must use an auxiliary locator to determine the injection location before inserting the needle and injecting the drug into the vitreous cavity. This, coupled with hand shaking, can cause damage to the lens and retina of the affected eye. This can be very inconvenient, especially for young doctors. Therefore, those skilled in the art have provided a novel, positionable intravitreal syringe to address the issues raised in the background art. Utility Model Content

[0004] 1. Technical problems to be solved:

[0005] In view of the above technical problems, the utility model provides a novel positionable intravitreal syringe.

[0006] 2. Technical solution:

[0007] A novel positionable intravitreal syringe comprises a guide positioning mechanism and a syringe, wherein the guide positioning mechanism comprises an outer barrel and a positioning ring, wherein the positioning ring is arranged at the front end of the outer barrel and is an integral structure concentrically arranged with the outer barrel, a concentric annular silicone gasket is provided on the front end face of the positioning ring, and the silicone gasket is positioned on the flat part of the ciliary body behind the corneal scleral margin of the patient's eyeball, a metal needle catheter is provided at the center position of the front end face of the outer barrel, and the front end face of the metal needle catheter does not exceed the front end face of the silicone gasket, the syringe is slidably connected to the inside of the outer barrel, and the outer side of the syringe is provided with a rubber stopper that increases the sliding friction coefficient, the rubber stopper matches the inner diameter of the outer barrel, and air holes are provided near the front end face of the outer barrel and on the side of the positioning ring.

[0008] Furthermore, the syringe includes an inner tube, a push rod and a piston. The rubber stopper is sleeved on the inner tube. The end of the inner tube extends out of the outer tube. The front end of the inner tube is provided with a connector that can be connected to a needle. The piston is arranged inside the inner tube. The outer diameter of the piston matches the inner diameter of the inner tube. The piston is fixed on the push rod. The end of the push rod extends out of the inner tube and is fixedly connected to a circular push handle.

[0009] Furthermore, a first wing handle is fixed to the end of the outer tube, and a second wing handle is fixed to the end of the inner tube. Both the first wing handle and the second wing handle have frosted surfaces on one side close to the push handle.

[0010] Furthermore, the needle is provided with two types: a medicine collection needle and an injection needle. The medicine collection needle is used to absorb the medicine to be injected, and the injection needle is used to inject the medicine into the patient's eyeball. The outer diameter of the injection needle is 30G. When the syringe slides to the front end of the outer tube and contacts the inner bottom surface of its end, the front end of the injection needle extends 14mm-16mm from the lower end surface of the silicone gasket.

[0011] Preferably, the outer diameter of the outer cylinder is 8 mm and the inner diameter is 7 mm.

[0012] Furthermore, the positioning ring has an outer diameter of 8 mm, an inner diameter of 6 mm, and a length of 5 mm; the silicone gasket has an outer diameter of 8 mm, an inner diameter of 6 mm, and a thickness of 1 mm; the metal needle catheter has an outer diameter of 2 mm, an inner diameter of 30G (G is the unit for measuring the thickness of the needle), and a length of 6 mm.

[0013] 3.Beneficial effects:

[0014] Compared with the existing technology, the utility model uses the silicone gasket (outer diameter 8mm) of the positioning ring at the front end of the outer tube to tightly contact the corneal sclera edge and the eyeball in a flexible manner, and the needle can be directly positioned on the flat part of the patient's ciliary body (4mm away from the corneal sclera edge); after the needle is inserted into the patient's eyeball, the positioning ring at the front end of the outer tube provides a certain supporting force to prevent unnecessary damage to the patient's eyeball due to hand shaking, needle slippage, etc. during drug injection; the air hole shared by the outer tube and the positioning ring can discharge the gas in the cavity to maintain the air pressure in the cavity during positioning and injection; in addition, positioning the needle and injecting the drug can be performed with one hand through the wing handles (with frosted surfaces) of the inner and outer tubes, freeing the auxiliary hand so that the auxiliary hand can better stop bleeding during surgery and deal with other emergency situations, which is safer. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] FIG1 is a schematic diagram of the structure of a novel positionable intravitreal syringe;

[0016] Figure 2 is a schematic diagram of the disassembled structure of a new positionable intravitreal syringe;

[0017] FIG3 is a schematic diagram of the enlarged structure of point A in FIG2 in a novel positionable intravitreal syringe;

[0018] FIG4 is a schematic diagram of the inner barrel drug dispensing structure of a novel positionable intravitreal syringe;

[0019] FIG5 is a schematic diagram of the assembly and positioning structure of a novel positionable intravitreal syringe;

[0020] FIG6 is a schematic diagram of the needle insertion structure of a novel positionable intravitreal syringe;

[0021] Figure 7 Schematic diagram of the injection angle and depth of a new positionable intravitreal syringe.

[0022] In the figure: 1. Inner cylinder; 2. Push rod; 3. Piston; 4. Dispensing needle; 5. Injection needle; 6. Outer cylinder; 7. Air hole; 8. Second wing handle; 9. First wing handle; 10. Positioning ring; 11. Metal needle catheter; 12. Silicone gasket; 13. Rubber stopper; 14. Push handle. DETAILED DESCRIPTION

[0023] The present invention will be described in detail below with reference to the accompanying drawings.

[0024] As attached Figure 1 To the attached Figure 7 ,

[0025] Example 1:

[0026] A novel positionable intravitreal syringe comprises a guide positioning mechanism and a syringe, wherein the guide positioning mechanism comprises an outer barrel 6 and a positioning ring 10, wherein the positioning ring 10 is arranged at the front end of the outer barrel 6 and is an integral structure concentrically arranged with the outer barrel 6, a concentric annular silicone gasket 12 is provided on the front end surface of the positioning ring 10, and the silicone gasket 12 is positioned on the flat part of the ciliary body behind the corneal scleral margin of the patient's eyeball, a metal needle catheter 11 is provided at the center position of the front end surface of the outer barrel 6, and the front end surface of the metal needle catheter 11 does not exceed the front end surface of the silicone gasket 12, the syringe is slidably connected to the inside of the outer barrel 6, and the outer sleeve of the syringe is provided with a The rubber stopper 13 matches the inner diameter of the outer tube 6 to prevent the syringe from shaking during injection. The outer tube 6 is provided with air holes 7 near its front end surface and on the side of the positioning ring 10. The outer diameter of the positioning ring is 8mm, the inner diameter is 6mm, and the length is 5mm. The outer diameter of the silicone gasket is 8mm, the inner diameter is 6mm, and the thickness of the silicone gasket is 1mm. The outer diameter of the metal needle catheter 11 is 2mm, the inner diameter is 30G (G is the unit for measuring the thickness of the needle), and the length is 6mm. The front end surface of the metal needle catheter 11 is flush with the front end surface of the silicone gasket. When the needle is inserted, it can compress the eyeball, avoid bleeding from the pinhole, and play a hemostatic role.

[0027] The syringe needles are available in two types: a drug removal needle 4 and an injection needle 5. The drug removal needle 4 is used to draw the medication to be injected, while the injection needle 5 is used to inject the medication into the patient's eye. The injection needle has an outer diameter of 30G. When the syringe slides to the front end of the outer barrel and contacts the inner surface of its end, the front end of the injection needle 5 protrudes 14mm-16mm from the lower end surface of the silicone gasket, limiting the insertion length of the injection needle 5 to prevent damage to the eyeball due to improper operation. Currently, the most commonly used syringe for surgical procedures is the 1mL syringe.

[0028] When using the novel positionable intravitreal syringe of this embodiment, the syringe inside the outer barrel 6 is first removed and replaced with the drug dispensing needle 4. The drug dispensing needle 4 is inserted into the medicine bottle to draw out the drug, and the excess air inside the syringe is expelled. The syringe is then replaced with the injection needle 5, and the syringe is reinserted into the outer barrel 6. The syringe is then pushed so that the injection needle 5 extends into the metal needle guide 11 and the tip of the injection needle 5 does not extend beyond the front end of the metal needle guide 11, thereby preventing the extended needle from injuring the lens and retina during positioning. The patient's upper and lower eyelids are then held open to expose the sclera. The outer edge of the silicone gasket 12 at the front end of the positioning ring 10 is brought into contact with the lateral tangent of the corneal sclera of the affected eye for positioning. The syringe is then pushed forward as a whole, so that the injection needle 5 is advanced through the metal needle guide 11. After the tip of the injection needle 5 enters the scleral limbus, it stops in the posterior vitreous, 4 mm from the corneal sclera. The needle is positioned at the pars plana of the patient's ciliary body, and the syringe is used to inject the drug into the vitreous cavity of the affected eye.

[0029] This embodiment utilizes a positioning ring 10 to directly position the needle tip at the pars plana of the patient's ciliary body. The positioning ring 10 at the front end of the outer barrel 6 also provides support for the injection needle 5 after insertion into the patient's eyeball, preventing unnecessary damage to the patient's eyeball due to hand shaking or needle slippage during injection. The air hole 7 allows for the discharge of air from the cavity, maintaining a constant pressure during positioning and injection.

[0030] Example 2:

[0031] The syringe includes an inner cylinder 1, a push rod 2 and a piston 3. The rubber stopper 13 is sleeved on the inner cylinder 1. The end of the inner cylinder 1 extends out of the outer cylinder 6. The front end of the inner cylinder 1 is provided with a connector that can be connected to a needle. The piston 3 is arranged inside the inner cylinder 1. The outer diameter of the piston 3 matches the inner diameter of the inner cylinder 1. The piston 3 is fixed on the push rod 2. The end of the push rod 2 extends out of the inner cylinder 1 and is fixedly connected to the circular push handle 14.

[0032] Example 3:

[0033] A first wing handle 9 is fixed to the end of the outer tube 6, and a second wing handle 8 is fixed to the end of the inner tube 1. Both the first and second wing handles 9 and 8 have frosted surfaces on the side closest to the push handle 14. The use of these wing handles allows needle insertion and medication injection to be performed single-handed, freeing the auxiliary hand for better intraoperative hemostasis and other emergency situations, resulting in greater safety.

[0034] Example 4:

[0035] As a preferred technical solution of the present invention, the outer diameter of the outer cylinder is 8 mm and the inner diameter is 7 mm.

[0036] Although the present invention has been disclosed above in terms of preferred embodiments, they are not intended to limit the present invention. Anyone skilled in the art can make various changes or modifications without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention should be based on the scope of protection defined by the claims of this application.

Claims

1. A new type of positionable intravitreal syringe, characterized in that: The invention comprises a guiding and positioning mechanism and a syringe, wherein the guiding and positioning mechanism comprises an outer cylinder and a positioning ring, wherein the positioning ring is arranged at the front end of the outer cylinder and is an integral structure concentrically arranged with the outer cylinder, a concentric annular silicone gasket is provided on the front end surface of the positioning ring, and the silicone gasket is positioned on the flat part of the ciliary body behind the corneal scleral margin of the patient's eyeball, a metal needle catheter is provided at the center position of the front end surface of the outer cylinder, and the front end surface of the metal needle catheter does not exceed the front end surface of the silicone gasket, the syringe is slidably connected to the inside of the outer cylinder, and a rubber stopper for increasing the sliding friction coefficient is provided on the outer side of the syringe, and the rubber stopper matches the inner diameter of the outer cylinder, and air holes are provided at the position of the outer cylinder near its front end surface and on the side of the positioning ring.

2. A novel positionable intravitreal syringe according to claim 1, characterized in that: The syringe includes an inner tube, a push rod and a piston. The rubber stopper is sleeved on the inner tube. The end of the inner tube extends out of the outer tube. The front end of the inner tube is provided with a joint that can be connected to a needle. The piston is arranged inside the inner tube. The outer diameter of the piston matches the inner diameter of the inner tube. The piston is fixed on the push rod. The end of the push rod extends out of the inner tube and is fixedly connected to a circular push handle.

3. A novel positionable intravitreal syringe according to claim 2, characterized in that: A first wing handle is fixed to the end of the outer cylinder, and a second wing handle is fixed to the end of the inner cylinder. Both the first wing handle and the second wing handle have frosted surfaces on one side close to the push handle.

4. The novel positionable intravitreal syringe according to claim 3, characterized in that: The needles are of two types: a medicine collection needle and an injection needle. The medicine collection needle is used to draw the medicine to be injected, and the injection needle is used to inject the medicine into the patient's eyeball. When the syringe slides to the front end of the outer tube and contacts the inner bottom surface of its end, the front end of the injection needle extends 14mm-16mm beyond the lower end surface of the silicone gasket.

5. The novel positionable intravitreal syringe according to claim 4, characterized in that: The outer diameter of the outer cylinder is 8 mm and the inner diameter is 7 mm.

6. The novel positionable intravitreal syringe according to claim 1, characterized in that: The outer diameter of the positioning ring is 8mm, the inner diameter is 6mm, and the length is 5mm. The outer diameter of the silicone gasket is 8mm, the inner diameter is 6mm, and the thickness of the silicone gasket is 1mm.

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