Pre-filled syringe with needle

Abstract

The prefilled syringe comprises a needle cylinder and a needle body, the needle body is located in a needle holding hole in the front end of the needle cylinder, the needle holding hole is communicated with an inner cavity of the needle cylinder, an elastic isolation cap is arranged on the needle body, the elastic isolation cap is supported between the side wall of the needle holding hole and the needle body, and the upper end of the needle holding hole is divided into an adhesive area isolated from the inner cavity of the needle cylinder. And the needle body is fixed in the needle holding hole through mucilage glue positioned in the mucilage glue area. By adopting the device disclosed by the utility model, the needle body can be easily assembled in the needle holding hole, and the elastic isolation cap can isolate the mucilage glue from the pre-filled liquid medicine, so that the pre-filled liquid medicine can be stored in the needle cylinder for a long time, and the use is not influenced.

Description

Technical Field

[0001] This utility model belongs to the field of medical device technology, specifically relating to a pre-filled syringe with a needle. Background Technology

[0002] Prefilled syringes (PFS) are a new type of high-end packaging material that can be directly filled with medication and used for injection. They combine the functions of a drug packaging container and a syringe into one. They can be used directly to fill medication during drug production and directly for injection during drug use, eliminating the traditional step of removing medication from ampoules or vials with a syringe. This makes them very convenient for healthcare professionals and patients to use. Due to these advantages, prefilled syringes are particularly widely used in biological agents.

[0003] Currently, pre-filled syringes come in two types: those with and without needles. To prevent contamination of biological drugs within the syringe, pre-filled syringes without needles often have a sealing cap at the tip of the syringe. Before use, the cap must be removed, the needle attached to the tip of the syringe, and then injection performed. However, this process still allows the drug inside the syringe to come into contact with outside air, thus affecting its efficacy.

[0004] Pre-filled syringes with needles can use injection-molded inserts to fix the needle, but this method is costly and requires significant investment. A large portion of pre-filled syringes with needles use UV adhesive to fix the needle to the syringe barrel. However, these pre-filled syringes currently do not isolate the UV adhesive from the drug solution. The biological agent solution inside can directly contact the UV adhesive. Prolonged contact can cause irreversible damage to the drug's properties, thus affecting its efficacy. Utility Model Content

[0005] This invention aims to solve the problems of the prior art by providing a pre-filled syringe with a needle, wherein the adhesive area is isolated from the inner cavity of the syringe by an elastic isolation cap, ensuring that the medicine inside the syringe does not come into contact with the adhesive and thus affect the efficacy of the medicine.

[0006] This pre-filled syringe with a needle includes a syringe barrel and a needle body. The needle body is located in a gripping hole at the front end of the syringe barrel, and the gripping hole communicates with the inner cavity of the syringe barrel. An elastic isolation cap is provided on the needle body, which is supported between the side wall of the gripping hole and the needle body, and divides the upper end of the gripping hole into an adhesive area that isolates it from the inner cavity of the syringe barrel. The needle body is fixed in the gripping hole by adhesive located in the adhesive area. Using this device, the needle body can be easily assembled into the gripping hole, and the elastic isolation cap can isolate the adhesive from the pre-filled medication, allowing the pre-filled medication to be stored in the syringe barrel for a long time without affecting its use.

[0007] Preferably, a needle-holding post is formed at the front end of the syringe, and the needle-holding hole is formed within the cavity of the needle-holding post. This reduces the wall thickness of the needle-holding hole, avoiding uneven wall thickness caused by thermal expansion and contraction of the material during injection molding, ensuring more uniform hole size, and facilitating production and assembly.

[0008] Preferably, the outer support of the needle grip post has reinforcing ribs. This increases the strength of the needle grip post and extends its service life.

[0009] Preferably, the adhesive area consists of an upper hole and a lower hole, with the diameter of the upper hole being larger than that of the lower hole. This increases the contact area between the adhesive and the needle-holding hole, and the different angles of the adhesive surfaces allow for a more secure bond to the needle body.

[0010] Preferably, the upper hole and the lower hole are connected by a first transition tapered hole. This makes it easier to slide the elastic isolation cap into the needle-holding hole during assembly.

[0011] Preferably, the needle gripping hole is divided into an adhesive area, an isolation cap area, and a guide area from top to bottom. The guide area provides space for needle insertion, facilitating needle assembly and allowing the liquid medication inside the syringe to flow more accurately and quickly to the needle.

[0012] Preferably, the aperture of the guide area is smaller than the aperture of the isolation cap area. In this way, the guide area with a smaller aperture can hold the elastic isolation cap in place, preventing it from falling further, and can easily position the elastic isolation cap for convenient assembly.

[0013] Preferably, the isolation cap area and the guide area are connected through a second transition cone hole. The tapered second transition cone hole ensures that the elastic isolation cap can block the needle gripping hole, thus ensuring the isolation of the adhesive from the pre-filled medication.

[0014] Preferably, the lower end of the needle body is flush with or nearly flush with the lower end of the elastic isolation cap. This minimizes the dead space area and avoids drug residue.

[0015] The pre-filled syringe with needle provided by this utility model has at least the following advantages:

[0016] The elastic isolation cap of this invention can effectively position the needle body, is easy to install, reliably fixed, has a simple structure, and low production cost; in addition, the elastic isolation cap can isolate the pre-filled medicine in the syringe from the adhesive, ensuring that the pre-filled medicine can be stored in the syringe for a long time without deterioration. Attached Figure Description

[0017] Figure 1 This is a partial cross-sectional view of Embodiment 1 of the present invention;

[0018] Figure 2 This is a partial cross-sectional view of Embodiment 2 of the present invention;

[0019] Figure 3 This is a partial cross-sectional view of the syringe of Embodiment 2 of this utility model;

[0020] Figure 4 This is a partial cross-sectional view of Embodiment 3 of the present invention;

[0021] Figure 5 This is a three-dimensional structural diagram of the present invention.

[0022] Explanation of reference numerals in the attached figures:

[0023] Syringe 1, Syringe inner cavity 11, Needle gripping hole 12, Adhesive area 121, Upper hole 1211, Lower hole 1212, First transition cone hole 1213, Isolation cap area 122, Guide area 123, Second transition cone hole 124, Needle gripping column 13, Reinforcing rib 14, Needle body 2, Elastic isolation cap 3, Adhesive 4. Detailed Implementation

[0024] The following specific embodiments illustrate the implementation of this utility model. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification.

[0025] It should be understood that the structures, proportions, sizes, etc., illustrated in the accompanying drawings of this specification are only for illustrative purposes to aid those skilled in the art and are not intended to limit the implementation of this utility model. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in proportions, or adjustments to size, without affecting the effects and objectives of this utility model, should still fall within the scope of the technical content disclosed in this utility model. Furthermore, the terms such as "upper," "lower," "left," "right," "middle," and "one" used in this specification are merely for clarity of description and are not intended to limit the scope of implementation of this utility model. Changes or adjustments to their relative relationships, without substantially altering the technical content, should also be considered within the scope of implementation of this utility model.

[0026] Example 1: As Figure 5 As shown, a pre-filled syringe with a needle includes a syringe barrel 1, with a needle gripping post 13 formed at the front end of the syringe barrel 1. Reinforcing ribs 14 are supported on the outer side of the needle gripping post 13. Multiple reinforcing ribs 14 are evenly distributed on the outer surface of the needle gripping post 13. Gaps are left between the reinforcing ribs 14 to facilitate processing and demolding.

[0027] like Figure 3As shown, the inner cavity of the needle-holding post 13 forms a needle-holding hole 12. The needle-holding hole 12 is divided from top to bottom into an adhesive area 121, an isolation cap area 122, and a guide area 123. The adhesive area 121 consists of an upper hole 1211 and a lower hole 1212, with the diameter of the upper hole 1211 being larger than that of the lower hole 1212. The lower hole 1212 and the isolation cap area 122 are integral holes, located at opposite ends. The diameter of the guide area 123 is smaller than that of the isolation cap area 122. The isolation cap area 122 and the guide area 123 are connected by a second transition cone hole 124.

[0028] like Figure 1 As shown, the needle body 2 is located within the needle gripping hole 12 at the front end of the syringe 1, and the needle gripping hole 12 communicates with the inner cavity 11 of the syringe. The needle body 2 is provided with an elastic isolation cap 3 located in the isolation cap area 122. The elastic isolation cap 3 is a cylindrical structure with a central hole, which is fitted onto the lower end of the needle body 2 through the central hole. Because of its elasticity, it can easily slide into the isolation cap area 122, supporting it between the inner wall of the needle gripping hole 12 and the needle body 2. The elastic isolation cap 3 can be made of materials such as butyl rubber, the same material as the syringe piston, and has no effect on the medication. The needle body 2 is fixed in the needle gripping hole 12 by adhesive 4 located in the adhesive area 121. The adhesive 4 can be a UV-cured adhesive, which, after curing, forms a stepped shaft-like structure, making it difficult to detach from the needle gripping hole 12.

[0029] This utility model discloses a pre-filled syringe with a needle, which can isolate the UV adhesive 4 from the liquid medicine located in the inner cavity 11 of the syringe, ensuring the efficacy of the medicine, allowing for long-term storage, and providing good results, which is conducive to its promotion.

[0030] Example 2: Figure 2 , Figure 3 As shown, the difference from Embodiment 1 is that in this embodiment, the upper hole 1211 and the lower hole 1212 are connected by a first transition conical hole 1213. The diameter of the first transition conical hole 1213 is larger at the top and smaller at the bottom. Its upper end diameter is the same as that of the upper hole 1211, and its lower end diameter is the same as that of the lower hole 1212, with the diameter gradually decreasing from top to bottom. This allows the elastic isolation cap 3 to slide more easily into the isolation cap area 122.

[0031] Example 3: As Figure 4 As shown, the difference from Example 1 is that the lower end of the needle body 2 is flush with or nearly flush with the lower end of the elastic isolation cap 3. This allows most of the medication to enter the needle body 2, reducing dead space and preventing medication waste due to residue.

Claims

1. A pre-filled syringe with a needle, comprising a syringe barrel (1) and a needle body (2), wherein the needle body (2) is located within a needle gripping hole (12) at the front end of the syringe barrel (1), and the needle gripping hole (12) communicates with the inner cavity (11) of the syringe barrel, characterized in that, The needle body (2) is provided with an elastic isolation cap (3), which is supported between the side wall of the needle gripping hole (12) and the needle body (2), and separates the upper end of the needle gripping hole (12) into an adhesive area (121) that is isolated from the inner cavity (11) of the syringe. The needle body (2) is fixed in the needle gripping hole (12) by adhesive (4) located in the adhesive area (121).

2. The pre-filled syringe with needle according to claim 1, characterized in that, The syringe (1) has a needle gripping post (13) at the front end, and the needle gripping hole (12) is formed by the inner cavity of the needle gripping post (13).

3. The pre-filled syringe with needle according to claim 2, characterized in that, The needle gripping column (13) is supported by a reinforcing rib (14) on its outer side.

4. The pre-filled syringe with needle according to claim 1, characterized in that, The adhesive area (121) is composed of an upper hole (1211) and a lower hole (1212), and the diameter of the upper hole (1211) is larger than the diameter of the lower hole (1212).

5. A pre-filled syringe with a needle according to claim 4, characterized in that, The upper hole (1211) and the lower hole (1212) are connected by a first transition tapered hole (1213).

6. A pre-filled syringe with a needle according to claim 1, characterized in that, The needle gripping hole (12) is divided into an adhesive area (121), an isolation cap area (122), and a guide area (123) from top to bottom.

7. A pre-filled syringe with a needle according to claim 6, characterized in that, The aperture of the guide area (123) is smaller than the aperture of the isolation cap area (122).

8. A pre-filled syringe with a needle according to claim 6, characterized in that, The isolation cap area (122) and the guide area (123) are connected through a second transition cone hole (124).

9. A pre-filled syringe with a needle according to claim 1, characterized in that, The lower end of the needle body (2) is flush with or nearly flush with the lower end of the elastic isolation cap (3).

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