CN221672276U - Injector for ophthalmic vitreous cavity medicine injection - Google Patents

Abstract

The utility model discloses an injector for ophthalmic vitreous cavity medicine injection, comprising: a syringe body and a needle, the syringe body comprising: an empty cylinder and a nipple arranged at the front end of the empty cylinder; a division plate is arranged in the hollow cylinder to divide the space in the hollow cylinder into an extraction cavity and a medicine injection cavity; the connecting position of the hollow cylinder and the nipple is provided with a valve plate connected with the partition plate, the valve plate is provided with two one-way valves, the medicine injection cavity is internally provided with a first piston, and the extraction cavity is internally provided with a second piston. The utility model divides the internal space of the hollow cylinder into the extraction cavity for executing the vitreous body extraction operation and the medicine injection cavity for executing the medicine injection, and the utility model does not need to be additionally provided with a tee joint and other pipe fittings, and has the advantages of small volume, simple external structure, convenient operation, stable structure and simple operation mode.

Description

A syringe for ophthalmic vitreous cavity drug injection

Technical Field

The utility model relates to the technical field of medical instruments, in particular to a syringe used for ophthalmic vitreous cavity drug injection.

Background Art

Due to the special nature of the eyes, oral administration, intravenous infusion, topical eye drops and other drug administration methods are difficult to achieve the drug concentration required to treat the disease. Direct injection of drugs through the vitreous cavity of the eye can effectively improve the drug's effect compared to the above administration methods.

At present, ordinary syringes are generally used for intravitreal injections. After a small amount of vitreous is extracted, another syringe needs to be replaced to inject the drug, which is extremely inconvenient to operate and has the risk of infection. In order to solve the above technical problems, technical personnel in this field proposed a new type of medical vitreous cavity syringe with application number 202022245324.5. After inserting the needle into the patient's eyeball, the first syringe body is manipulated to absorb the vitreous, and then the second syringe body is manipulated to inject the liquid medicine into the vitreous. However, this type of syringe requires two-handed operation, that is, one hand holds the tube body, and the other hand manipulates the two syringe bodies. Although the support structure is designed to assist in fixing the tube body, the stability of this syringe is poor due to the elasticity and instability of the skin and the two-handed operation.

Summary of the invention

To solve the above technical problems, the utility model provides a syringe for ophthalmic vitreous cavity drug injection. In order to have a basic understanding of some aspects of the disclosed embodiments, a simple summary is given below. This summary is not a general review, nor is it intended to determine the key/important components or describe the scope of protection of these embodiments. Its only purpose is to present some concepts in a simple form as a preface to the detailed description that follows.

The utility model adopts the following technical solutions:

Provided is a syringe for ophthalmic vitreous cavity drug injection, comprising: a syringe body and a needle, wherein the syringe body comprises: a hollow barrel and a nipple arranged at the front end of the hollow barrel;

A partition plate is arranged inside the empty cylinder to divide the inner space of the empty cylinder into an extraction chamber and a medicine injection chamber;

A valve plate connected to the partition plate is arranged at the connecting position of the empty cylinder and the nipple, and two one-way valves are arranged on the valve plate. A first piston is arranged in the injection chamber, and a second piston is arranged in the extraction chamber. The first piston and the second piston are provided with limiting sealing surfaces adapted to the valve plate.

Furthermore, the adaptation of the valve plate to the position limiting sealing surface means that when the first piston and the second piston are pushed to the front end position of the empty cylinder, the valve plate fits the position limiting sealing surface and covers the two one-way valves.

Furthermore, the two one-way valves are respectively a first one-way valve and a second one-way valve; the first one-way valve is arranged on the side of the valve plate located at the injection chamber, and the liquid inlet side of the first one-way valve is located in the cavity space of the injection chamber, and the liquid outlet side of the first one-way valve is located in the internal space of the nipple; the second one-way valve is arranged on the side of the valve plate located at the extraction chamber, and the liquid inlet side of the second one-way valve is located in the internal space of the nipple, and the liquid outlet side of the second one-way valve is located in the cavity space of the extraction chamber.

Furthermore, the syringe body also includes: a liquid medicine extraction head and a third one-way valve; the liquid medicine extraction head is arranged on the side of the empty barrel and is connected to the medicine injection cavity, and the third one-way valve is arranged in the liquid medicine extraction head.

Furthermore, the syringe body also includes: a vitreous discharge head and a fourth one-way valve; the vitreous discharge head is arranged on the side of the empty barrel and communicated with the extraction chamber, and the fourth one-way valve is arranged in the vitreous discharge head.

Furthermore, the syringe body also includes: a paddle and a finger ring; a piston shaft is provided on the first piston and the second piston; a long hollow groove is provided on the side of the hollow cylinder, one end of the paddle is connected to the piston shaft, and the other end passes through the long hollow groove and is connected to the finger ring.

Furthermore, the needle includes: a needle stem and a needle plug, the needle plug is sleeved on the nipple, and the needle stem is arranged on the needle plug.

Furthermore, the piston shaft is a hollow cylindrical tube, and a plurality of notches are provided on the piston shaft along the circumference of the piston shaft to form tear lines.

Beneficial effects brought by the utility model:

1. The present application divides the internal space of the hollow cylinder into an extraction chamber for vitreous extraction and an injection chamber for drug injection, without the need for additional pipe fittings such as tees, and has the advantages of small size and simple external structure, which is easy to operate;

2. The structural design of the present application enables the physician to perform one-handed operation, and rapid injection can be achieved by pushing and pulling the first piston and the second piston. The structure is stable and the operation is simple.

BRIEF DESCRIPTION OF THE DRAWINGS

In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

FIG1 is a schematic diagram of a syringe for ophthalmic vitreous cavity drug injection in a state when no injection is performed;

FIG2 is a schematic diagram of the structure of a syringe for ophthalmic vitreous cavity drug injection when extracting vitreous body according to the utility model;

FIG3 is a schematic diagram of the structure of a syringe for ophthalmic vitreous cavity drug injection when the vitreous is discharged;

FIG4 is a schematic diagram of the structure of a syringe for ophthalmic vitreous cavity drug injection when extracting drugs;

FIG. 5 is a schematic structural diagram of a syringe for ophthalmic vitreous cavity drug injection during drug injection in the utility model.

DETAILED DESCRIPTION

The following is a detailed description of the embodiments of the utility model in conjunction with the accompanying drawings. It should be clear that the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

As shown in Figures 1-5, in some illustrative embodiments, the utility model provides a syringe for ophthalmic vitreous cavity drug injection, including: a syringe body and a needle, the needle and the syringe body are separate structures, that is, the needle needs to be inserted into the front end of the syringe body when in use.

The syringe body includes: an empty barrel 1, a nipple 2, a partition plate 3, a valve plate 4, a first piston 5, a second piston 6, a liquid extraction head 7, a vitreous body discharge head 8, a paddle 9, a finger ring 10, a piston shaft 11 and a one-way valve group.

The one-way valve group is composed of four one-way valves, namely the first one-way valve 201, the second one-way valve 202, the third one-way valve 203, and the fourth one-way valve 204. The needle includes: a needle stem 13 and a needle plug 14, the needle plug 14 is sleeved on the nipple 2, and the needle stem 13 is arranged on the needle plug 14.

The nipple 2 is arranged at the front end of the hollow cylinder 1, in a truncated cone shape, and is an integrally formed structure with the hollow cylinder 1. When in use, the needle is sleeved on the nipple 2. The partition plate 3 is arranged inside the hollow cylinder 1, and the inner space of the hollow cylinder 1 is divided into two spaces, and the two spaces are both connected to the inner space of the nipple 2, which are recorded as the injection chamber 101 and the extraction chamber 102 according to their functions. The injection chamber 101 is used to extract and inject the drug, and the extraction chamber 102 is used to extract and discharge the vitreous body.

A valve plate 4 connected to the partition plate 3 is provided at the joint position of the hollow cylinder 1 and the nipple 2. The valve plate 4 is in an inclined state, and two one-way valves are provided on the valve plate 4, namely, a first one-way valve 201 and a second one-way valve 202. The design of the valve plate 4 enables the injection cavity 101 and the extraction cavity 102 to exist independently of the internal space of the nipple 2, and the flow of the drug solution and the vitreous body can only be achieved through the first one-way valve 201 and the second one-way valve 202.

A first piston 5 is arranged in the injection cavity 101, and a second piston 6 is arranged in the extraction cavity 102. The first piston 5 and the second piston 6 are provided with a position-limiting sealing surface 12 adapted to the valve plate 4. The valve plate 4 is adapted to the position-limiting sealing surface 12, which means that when the first piston 5 and the second piston 6 are pushed to the front end position of the empty cylinder 1, that is, the position closest to the needle, the valve plate 4 fits with the position-limiting sealing surface 12 and covers the first one-way valve 201 and the second one-way valve 202, so that the two one-way valves cannot pass liquid normally, or only a small amount of liquid can seep out or pass through.

The first one-way valve 201 is arranged on the side of the valve plate 4 located at the injection cavity 101, and the liquid inlet side of the first one-way valve 201 is located in the cavity space of the injection cavity 101, and the liquid outlet side of the first one-way valve 201 is located in the internal space of the nipple 2, so that the liquid in the injection cavity 101 can only enter the nipple 2 from the injection cavity 101. The second one-way valve 202 is arranged on the side of the valve plate 4 located at the extraction cavity 102, and the liquid inlet side of the second one-way valve 202 is located in the internal space of the nipple 2, and the liquid outlet side of the second one-way valve 202 is located in the cavity space of the extraction cavity 102, so that the vitreous body in the nipple 2 can only enter the extraction cavity 102 from the internal space of the nipple 2.

The liquid medicine extraction head 7 is arranged on the side of the empty cylinder 1 and communicated with the injection cavity 101. The third one-way valve 203 is arranged in the liquid medicine extraction head 7. The function of the third one-way valve 203 is to allow only the external liquid medicine to enter the empty cylinder 1 through the liquid extraction head 7, and not to flow in the reverse direction. The vitreous discharge head 8 is arranged on the side of the empty cylinder 1 and communicated with the extraction cavity 102. The fourth one-way valve 204 is arranged in the vitreous discharge head 8. The function of the fourth one-way valve 204 is to allow only the vitreous in the empty cylinder 1 to be discharged from the empty cylinder 1 through the vitreous discharge head 8, and not to flow in the reverse direction.

The first piston 5 and the second piston 6 are both provided with a piston shaft 11; a long hollow groove 103 is provided on the side of the hollow cylinder 1, one end of the paddle 9 is connected to the piston shaft 11, and the other end is connected to the finger ring 10 after passing through the long hollow groove 103. When in use, the index finger and the middle finger respectively hook the finger rings 10 on both sides of the hollow cylinder 1, the palm of the hand is against the tail end of the hollow cylinder 1, and the first piston 5 and the second piston 6 are pushed/pulled by the index finger and the middle finger to achieve the injection of the drug. The specific operation process is as shown in Figure 2. At this time, the limiting sealing surface 12 of the first piston 5 is close to the valve plate 4, so that the first one-way valve 201 cannot pass the liquid normally, or only a small amount of liquid can seep out and pass through. First, pull out the second piston 6 so that the vitreous body enters the nipple 2, and then enters the extraction chamber 102 through the second one-way valve 202. After a sufficient amount of extraction is taken, as shown in FIG3, push the second piston 6 so that the vitreous body enters the vitreous body discharge head 8 through the fourth one-way valve 204, and finally discharges to the outside of the syringe. After completion, the limiting sealing surface 12 of the second piston 6 is in close contact with the valve plate 4, so that the second one-way valve 202 cannot pass the liquid normally, or only a small amount of liquid can seep out and penetrate. As shown in FIG4, pull out the first piston 5 so that the liquid medicine enters the injection chamber 101 from the liquid medicine extraction head 7 and the third one-way valve 203, and then push the first piston 5 as shown in FIG5 so that the liquid medicine enters the nipple 2 through the first one-way valve 201, and finally completes the injection.

The piston shaft 11 is a hollow cylindrical tube, and a plurality of notches are provided on the piston shaft 11 along the circumference of the piston shaft 11 to form a tear line 15. After the injection is completed, the piston shaft 11 is twisted off along the tear line 15, and the twisted piston shaft 11 is sleeved on the needle to ensure the safety of the discarded syringe when it is disposed.

The above is only a specific implementation of the utility model, but the protection scope of the utility model is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed by the utility model should be included in the protection scope of the utility model. Therefore, the protection scope of the utility model should be based on the protection scope of the claims.

Claims (8)

1. A syringe for ophthalmic vitreous cavity drug injection, comprising: syringe main part and syringe needle, its characterized in that, the syringe main part includes: an empty cylinder and a nipple arranged at the front end of the empty cylinder;

a partition plate is arranged in the hollow cylinder to partition the space in the hollow cylinder into an extraction cavity and a medicine injection cavity;

The device is characterized in that a valve plate connected with the partition plate is arranged at the joint position of the hollow cylinder and the nipple, two one-way valves are arranged on the valve plate, a first piston is arranged in the medicine injection cavity, a second piston is arranged in the extraction cavity, and a limiting sealing surface matched with the valve plate is arranged on the first piston and the second piston.

2. The injector for injecting a drug into an ophthalmic vitreous cavity according to claim 1, wherein the adaptation of the valve plate and the limiting sealing surface means that when the first piston and the second piston are pushed to the foremost position of the hollow cylinder, the valve plate is attached to the limiting sealing surface and covers the two check valves.

3. The syringe for ophthalmic vitreous cavity drug injection according to claim 2, wherein said two one-way valves are a first one-way valve and a second one-way valve, respectively;

the first one-way valve is arranged on one side of the valve plate sheet, which is positioned on the medicine injection cavity, the liquid inlet side of the first one-way valve is positioned in the cavity space of the medicine injection cavity, and the liquid outlet side of the first one-way valve is positioned in the inner space of the nipple;

The second one-way valve is arranged on one side of the valve plate sheet, which is positioned on one side of the extraction cavity, the liquid inlet side of the second one-way valve is positioned in the inner space of the nipple, and the liquid outlet side of the second one-way valve is positioned in the inner space of the extraction cavity.

4. A syringe for ophthalmic vitreous cavity drug injection according to claim 3, wherein said syringe body further comprises: a liquid medicine extracting head and a third one-way valve; the liquid medicine extraction head is arranged on the side face of the empty cylinder and communicated with the medicine injection cavity, and the third one-way valve is arranged in the liquid medicine extraction head.

5. The syringe for ophthalmic vitreous cavity drug injection of claim 4, wherein said syringe body further comprises: a vitreous body discharge head and a fourth one-way valve; the glass body discharge head is arranged on the side face of the empty cylinder and communicated with the extraction cavity, and the fourth one-way valve is arranged in the glass body discharge head.

6. The syringe for ophthalmic vitreous cavity drug injection of claim 5, wherein said syringe body further comprises: a pulling piece and a finger ring; piston shafts are arranged on the first piston and the second piston; the side of the hollow cylinder is provided with a long hollow groove, one end of the poking piece is connected with the piston shaft, and the other end of the poking piece penetrates through the long hollow groove and then is connected with the finger ring.

7. A syringe for ophthalmic vitreous cavity drug injection according to claim 6, wherein said needle comprises: needle stalk and pintle, the pintle cover is established on the nipple, the needle stalk sets up on the pintle.

8. The syringe for injecting a vitreous cavity medicament according to claim 7, wherein said plunger shaft is a hollow cylindrical barrel, and a plurality of slits are formed in said plunger shaft along a circumferential direction of said plunger shaft to form a tear line.