CN217772923U - Prefilled syringe - Google Patents

Abstract

The utility model discloses a embedment syringe in advance, including cylinder, luer lock, helmet, piston and push rod, the front end of cylinder is equipped with the luer lock of in-band screw thread, is equipped with the conical head in the luer lock, is equipped with the screw thread that matches with the internal thread of luer lock on the helmet, and the open end of cylinder adopts the piston to seal, and piston and push rod are connected, the cylinder outer wall is provided with certain tapering and cylinder front end external diameter and is less than the rear end external diameter. The utility model discloses a convenient drawing of patterns of structure avoids product drawing of patterns in-process outer wall fish tail, has improved product quality, and has improved production efficiency, practices thrift manufacturing cost.

Description

Prefilled syringe

Technical Field

The utility model relates to a medicine packaging container, concretely relates to embedment syringe in advance.

Background

The common package of small-volume injection is penicillin bottle, when used in hospital, medical personnel need to draw out the solvent (water for injection, sodium chloride injection, etc.) with an injector, transfer the solvent into the penicillin bottle, dissolve and dilute the drug, and then suck out for injection or add the drug into an infusion bag. Clinical use finds that the injection mode has a plurality of inconveniences, and risks such as wrong medicine distribution, excessive residual quantity, scrap falling caused by rubber plug puncture and the like can occur. In severe cases, the life health of the patient can be endangered.

The prefilled syringe directly fills the prepared liquid medicine into the syringe, which is a packaging container and plays a role in protecting and storing medicines; meanwhile, the injection is also an injector, is convenient and direct to use, and avoids the dissolution and medicine mixing before injection. The pre-filled syringe has two materials: glass and plastic materials. Glass is fragile and risks flaking in high pH formulations, sensitive formulations (e.g. formulations containing citric acid, EDTA, etc.). The plastic pre-filled syringe is mostly formed by injection molding of high-transparency synthetic resin, such as cycloolefin polymer, thermoplastic polyurethane and the like, and the appearance transparency of the plastic pre-filled syringe is equivalent to that of a glass pre-filled syringe.

The pre-filled and sealed injector of the cycloolefin polymer has the advantages that: low protein adsorption; excellent chemical stability, strong acid and alkali resistance; no tungsten residue, and is stable to protein substances; high strength and transparency, beautiful appearance and difficult breakage. The production process of the cycloolefin polymer pre-filled and sealed injector is rigorous, and the requirements on the injection molding process and the mold precision are higher.

The material of the cycloolefin polymer prefilled syringe is plastic, the price of granules is high, the abrasive resistance of the cycloolefin polymer prefilled syringe is slightly poorer than that of glass, the outer wall is easily scratched in the production process, particularly in the demoulding process, so that the product defect is caused, the defective rate is too high, and the production cost is increased.

SUMMERY OF THE UTILITY MODEL

In view of this, in order to solve the above-mentioned problem that exists in the prior art, the utility model aims at providing a prefilled syringe.

The utility model discloses the technical scheme who adopts does: the utility model provides a embedment syringe in advance, includes cylinder, luer lock, helmet, piston and push rod, the front end of cylinder is equipped with the luer lock of taking the internal thread, is equipped with the conical head in the luer lock, is equipped with the screw thread that matches with the internal thread of luer lock on the helmet, and the open end of cylinder adopts the piston to seal, and piston and push rod are connected, the cylinder outer wall is provided with certain tapering and cylinder front end external diameter is less than the rear end external diameter.

In some embodiments of the present invention, the outer diameter of the luer lock is smaller than the outer diameter of the front end of the syringe, and the difference between the outer diameters is not more than 0.05mm.

In some embodiments of the present invention, a push handle is provided at the rear end of the needle cylinder.

In some embodiments of the present invention, a taper with a difference of no more than 0.05mm is provided around the push handle.

In some embodiments of the present invention, the outer wall of the cylinder is provided with a taper not exceeding 0.3 ° and the outer diameter of the front end of the cylinder is smaller than the outer diameter of the rear end.

In some embodiments of the present invention, a protruding portion connected to the conical head is provided in the protective cap, which plays a role of sealing the conical head.

In some embodiments of the present invention, the syringe and luer lock are integrally injection molded.

In some embodiments of the present invention, the syringe and luer lock material are a cyclic olefin polymer.

In some embodiments of the present invention, the material of the protective cap and the piston is butyl rubber or thermoplastic elastomer.

In some embodiments of the present invention, the material of the push rod is polypropylene (PP), polycarbonate (PC) or Polystyrene (PS).

The beneficial effects of the utility model are that:

the utility model discloses a prefilled syringe seals syringe's cylinder outer wall is provided with certain tapering and cylinder front end external diameter and is less than the rear end external diameter, and the luer lock external diameter is less than cylinder front end external diameter, pushes away the handle around be provided with the tapering, foretell structural design makes things convenient for the cylinder drawing of patterns behind injection moulding, avoids product drawing of patterns in-process outer wall fish tail, has improved product quality, and has improved production efficiency, practices thrift manufacturing cost.

Drawings

Fig. 1 is a schematic cross-sectional structure diagram of a pre-filled and sealed syringe according to an embodiment of the present invention.

Fig. 2 is a partial schematic view of the luer lock and the front end of the syringe.

Fig. 3 is a partial schematic view of the rear end push handle of the syringe.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention, as generally described and illustrated in the figures herein, may be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the invention, as presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

It should be noted that, in the present invention, the embodiments and features of the embodiments may be combined with each other without conflict.

It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.

In the description of the embodiments of the present invention, it should be noted that the indication of the position or the positional relationship is based on the position or the positional relationship shown in the drawings, or the position or the positional relationship that the utility model is usually placed when using, or the position or the positional relationship that the skilled person conventionally understands, or the position or the positional relationship that the utility model is usually placed when using, and is only for the convenience of describing the present invention and simplifying the description, but does not indicate or suggest that the indicated device or element must have a specific position, be constructed and operated in a specific position, and thus, cannot be understood as limiting the present invention. Furthermore, the terms "first" and "second" are used merely to distinguish one description from another, and are not to be construed as indicating or implying relative importance.

In the description of the embodiments of the present invention, it should be further noted that unless otherwise explicitly stated or limited, the terms "disposed" and "connected" should be interpreted broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; may be directly connected or indirectly connected through an intermediate. The specific meaning of the above terms in the present invention can be understood as specific cases to those skilled in the art; the drawings in the embodiments are provided to clearly and completely describe the technical solutions in the embodiments of the present invention, and it is obvious that the described embodiments are some, not all embodiments of the present invention. The components of embodiments of the present invention, as generally described and illustrated in the figures herein, may be arranged and designed in a wide variety of different configurations.

With reference to fig. 1-3, a prefilled syringe comprises a needle cylinder 1, a luer lock 2, a protective cap 3, a piston 4 and a push rod 5, wherein the luer lock 2 with internal threads is arranged at the front end of the needle cylinder 1, a conical head 7 is arranged in the luer lock 2, threads matched with the internal threads of the luer lock 2 are arranged on the protective cap 3, the open end of the needle cylinder 1 is sealed by the piston 4, the piston 4 is connected with the push rod 5, and the outer wall of the needle cylinder 1 is provided with a certain taper and the outer diameter of the front end of the needle cylinder is smaller than the outer diameter of the rear end of the needle cylinder. In this embodiment, the outer wall of the syringe is provided with a taper of not more than 0.3 °. The outer diameter of the luer lock 2 is smaller than the outer diameter of the front end of the needle cylinder 1, and the difference between the outer diameters of the luer lock and the needle cylinder is not more than 0.05mm, as shown in figure 2. The rear end of the needle cylinder 1 is provided with a push handle 6, and the front part and the rear part of the push handle 6 are provided with conicity with the difference not exceeding 0.05mm, as shown in figure 3. The protective cap 3 is internally provided with a convex part connected with the conical head 7 to play a role of sealing the conical head.

The needle cylinder and the luer lock are integrally formed by injection molding, and the needle cylinder and the luer lock are made of cycloolefin polymer. The material of the protective cap and the piston is butyl rubber or thermoplastic elastomer. The push rod is made of polypropylene (PP), polycarbonate (PC) or Polystyrene (PS).

The present invention is not limited to the above-mentioned optional embodiments, and any other products in various forms can be obtained by anyone under the teaching of the present invention, and any changes in the shape or structure thereof, all the technical solutions falling within the scope of the present invention, are within the protection scope of the present invention.

Claims (10)

1. The utility model provides a embedment syringe in advance, includes cylinder, luer lock, helmet, piston and push rod, its characterized in that, the front end of cylinder is equipped with the luer lock of taking the internal thread, is equipped with the conical head in the luer lock, is equipped with the screw thread that matches with the internal thread of luer lock on the helmet, and the open end of cylinder adopts the piston to seal, and piston and push rod are connected, the cylinder outer wall is provided with certain tapering and cylinder front end external diameter and is less than the rear end external diameter.

2. The pre-filled, sealed syringe of claim 1, wherein said luer lock outer diameter is less than the barrel front end outer diameter, and the difference between the two outer diameters is no more than 0.05mm.

3. The pre-filled and sealed syringe as claimed in claim 1 or 2, wherein a push handle is provided at the rear end of the cylinder.

4. The pre-filled and sealed syringe of claim 3, wherein the pushing handle is provided with tapers in front and back thereof with a difference of no more than 0.05mm.

5. The pre-filled and sealed syringe of claim 1, wherein the outer wall of said barrel is provided with a taper of no more than 0.3 ° and the outer diameter of the barrel at the front end is smaller than the outer diameter at the rear end.

6. The pre-filled syringe as recited in claim 1, wherein the cap has a raised portion for engaging the conical head.

7. The pre-filled syringe of claim 1 wherein the barrel and luer lock are integrally injection molded.

8. The pre-filled syringe as defined in claim 1 wherein the barrel is made of a cyclic olefin polymer.

9. The pre-filled syringe of claim 1 wherein the cap and the plunger are made of butyl rubber or a thermoplastic elastomer.

10. The pre-filled syringe of claim 1 wherein the plunger is made of polypropylene, polycarbonate or polystyrene.

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