CN110064097A - Precharging injection syringe - Google Patents

Abstract

The invention discloses a prefilled syringe, which comprises a cylinder body and a cone head, the cone head is arranged on the top of the cylinder body and communicated with the cylinder body; the prefilled syringe further comprises: a fixing seat, the fixing seat is arranged on the cylinder body the top, and the fixing seat is arranged around the cone head; the sleeve, one end of the sleeve is located in the fixing seat and is detachably connected with the fixing seat; the elastic structure, the elastic structure is clamped in the sleeve, and the elastic structure is connected with the sleeve The side wall of the cylinder is in interference fit, the cone head is clamped in the elastic structure body, and the outer wall of the cone head is in interference fit with the elastic structure body. Through the interference fit between the elastic structure body and the sleeve and the interference fit between the cone head and the elastic structure body, the present invention keeps the prefilled syringe in a closed state all the time before the patient uses it, and maintains the maximum amount of the infusion liquid in the prefilled syringe. Excellent tightness and integrity, so that the prefilled syringe will not leak during steam sterilization; at the same time, the elastic structure will not loosen even during bumpy transportation.

Description

prefilled syringe

technical field

The present invention relates to a prefilled syringe.

Background technique

In clinical infusion, before the prefilled syringe is used, the infusion liquid in the prefilled syringe must maintain the sealing and integrity to achieve the best drug effect. That is to say, the prefilled syringe must not only be in an undamaged state, At the same time, it should be in contact with the infusion fluid for the first time when the patient uses it. However, in the prior art, due to the different specific sterilization processes (such as steam sterilization and many other sterilization methods in the pharmaceutical industry) that are pretreated before leaving the factory, the sealing performance of the prefilled syringe is not good, which is prone to leakage. liquid, thereby affecting the efficacy of the drug.

SUMMARY OF THE INVENTION

The technical problem to be solved by the present invention is to provide a prefilled syringe in order to overcome the defect of the prior art that the prefilled syringe is not well sealed and is prone to liquid leakage, thereby affecting the efficacy of the drug.

The present invention solves the above-mentioned technical problems through the following technical solutions:

A prefilled syringe comprising a barrel body and a cone head, the cone head is arranged on the top of the barrel body and communicated with the barrel body, and is characterized in that the prefilled syringe further comprises:

a fixing seat, the fixing seat is arranged on the top of the cylinder, and the fixing seat is arranged around the cone head;

a sleeve, one end of the sleeve is located in the fixing seat and is detachably connected with the fixing seat;

an elastic structure body, the elastic structure body is clamped in the sleeve, and the elastic structure body is in interference fit with the side wall of the sleeve, the cone head is clamped in the elastic structure body, and The outer wall of the cone head is in interference fit with the elastic structure.

In this technical solution, through the interference fit between the elastic structure body and the sleeve and the interference fit between the cone head and the elastic structure body, the prefilled syringe is always in a closed state before the patient uses it, and the prefilled syringe is kept inside the prefilled syringe. The optimal tightness and integrity of the infusion liquid prevent the prefilled syringe from leaking; at the same time, due to the interference fit, the elastic structure will not loosen even during bumpy transportation.

Preferably, the elastic structure body includes an elastic structure body head portion and an elastic structure body rod portion which are connected, and the outer diameter of the elastic structure body head portion is larger than the outer diameter of the elastic structure body rod portion.

Preferably, the sleeve includes a connected sleeve head and a sleeve rod, the outer diameter and inner diameter of the sleeve head are both larger than the outer diameter and inner diameter of the sleeve rod, and the elastic The structure head is clamped in the sleeve head, the elastic structure rod is clamped in the sleeve rod, and the outer diameter of the elastic structure head is larger than the sleeve head The inner diameter of the rod portion of the elastic structure is larger than the inner diameter of the rod portion of the sleeve.

Preferably, the outer peripheral surface of the sleeve head is polygonal.

In this technical solution, the outer peripheral surface of the head of the sleeve is set to be a polygon, so that a larger friction force can be generated when the sleeve is rotated, which facilitates the installation and removal of the sleeve.

Preferably, the end of the sleeve away from the cylinder body is provided with a limiting platform, and the limiting platform is arranged on the inner surface of the side wall of the sleeve and extends inward along the radial direction of the sleeve. , the top of the elastic structure abuts against the bottom of the limiting platform.

In this technical solution, the limiting platform is provided to limit the position of the elastic structure along the axial direction of the sleeve, so that the elastic structure can extend and deform in the direction of the cone head and the cylinder body as far as possible.

Preferably, an end of the elastic structure body close to the cylinder body is provided with a convex ring, the convex ring extends outward along the radial direction of the elastic structure body, the convex ring is located outside the sleeve, and against the bottom of the sleeve.

In this technical solution, by arranging the convex ring, the elastic structure body and the sleeve are made tighter, and the sealing performance is better.

Preferably, the top of the cylinder body is provided with a groove, and the convex ring of the elastic structure is clamped in the groove.

In this technical solution, the elastic structure body and the cylinder body can be relatively limited and have better sealing performance through the cooperation between the convex ring of the elastic structure body and the groove of the cylinder body.

Preferably, the outer diameter of the elastic structure gradually increases from being close to the cylinder to being away from the cylinder.

In this technical solution, by setting the outer diameter of the elastic structure body to gradually increase from being close to the cylinder body to being away from the cylinder body, the interference fit between the elastic structure body and the sleeve can be better achieved.

Preferably, the end of the elastic structure facing the cylinder is provided with a sealing hole, and the cone head is clamped in the sealing hole; the outer diameter of the cone head varies from far from the cylinder to close to The cylinder body is gradually increased, the diameter of the sealing hole is gradually increased from being far from the cylinder body to being close to the cylinder body, and the diameter of the sealing hole is smaller than the outer diameter of the corresponding position of the cone head.

In this technical solution, by setting the corresponding relationship between the diameter of the sealing hole of the elastic structure body and the outer diameter of the cone head, the interference fit between the elastic structure body and the cone head can be better achieved.

Preferably, the inner surface of the fixing seat and the outer surface of the sleeve are threaded.

The positive progressive effect of the present invention is:

Through the interference fit between the elastic structure body and the sleeve and the interference fit between the cone head and the elastic structure body, the present invention keeps the prefilled syringe always in a closed state before the patient uses it, and maintains the maximum amount of the infusion liquid in the prefilled syringe. Excellent airtightness and integrity, so that the prefilled syringe will not leak during steam sterilization; at the same time, due to the interference fit, the elastic structure will not loosen even during bumpy transportation.

Description of drawings

FIG. 1 is a partial cross-sectional structural schematic diagram of the prefilled syringe according to Embodiment 1 of the present invention.

FIG. 2 is a schematic structural diagram of the elastic structure of the prefilled syringe according to Example 1 of the present invention.

3 is a schematic cross-sectional structural diagram of the elastic structure of the prefilled syringe according to Example 1 of the present invention.

4 is a schematic structural diagram of the sleeve of the prefilled syringe according to Example 1 of the present invention.

5 is a schematic cross-sectional structural diagram of the sleeve of the prefilled syringe according to Embodiment 1 of the present invention.

FIG. 6 is a schematic structural diagram of the sleeve of the prefilled syringe according to Embodiment 2 of the present invention.

7 is a schematic cross-sectional structural diagram of the sleeve of the prefilled syringe according to Embodiment 2 of the present invention.

Description of reference numerals

Cylinder 10

Groove 11

Cone 20

Mount 30

Sleeve 40

Limit table 41

Socket head 45

Sleeve stem 46

Elastomeric Structure 50

Boss 51

Sealing hole 52

Elastomeric Structure Head 55

Elastomeric Structure Rod 56

Outer diameter of cone head D1

Diameter of sealing hole D2

Outer diameter D3 of the head of the elastic structure

Outer diameter D4 of the rod of the elastic structure

Inner diameter of sleeve head D5

Inner diameter of sleeve stem D6

Detailed ways

The present invention is further described below by means of examples, but the present invention is not limited to the scope of the examples.

Example 1

Please understand with reference to FIGS. 1 to 5 , this embodiment provides a prefilled syringe, which includes a barrel 10 , a cone head 20 , a fixed seat 30 , a sleeve 40 and an elastic structure 50 . The cone head 20 is arranged on the top of the cylindrical body 10 and communicates with the cylindrical body 10 . The fixing seat 30 is arranged on the top of the cylinder body 10 , and the fixing seat 30 is arranged around the cone head 20 . One end of the sleeve 40 is located in the fixing seat 30 and is detachably connected with the fixing seat 30 . In this embodiment, the inner surface of the fixing seat 30 and the outer surface of the sleeve 40 are threaded, but are not limited to threaded cooperation. The fixing seat 30 and the sleeve 40 may also be other detachable matching methods such as snaps.

The elastic structure body 50 is clamped in the sleeve 40, and the elastic structure body 50 is in interference fit with the side wall of the sleeve 40. The cone head 20 is clamped in the elastic structure body 50, and the outer wall of the cone head 20 is in contact with the elastic structure body. 50 interference fit. In this embodiment, the material of the elastic structure body 50 is rubber, but it is not limited to rubber, and may be other deformable elastic bodies. In this way, through the interference fit between the elastic structure body 50 and the sleeve 40 and the interference fit between the cone head 20 and the elastic structure body 50, the prefilled syringe is always in a closed state before the patient uses it, and the prefilled syringe is kept inside the prefilled syringe. The best airtightness and integrity of the infusion liquid, so that the pre-filled syringe will not leak during the steam sterilization; at the same time, due to the interference fit, the elastic structure 50 can be used even during bumpy transportation. Nor will it loosen.

An end of the elastic structure 50 close to the cylinder 10 is provided with a convex ring 51 , the convex ring 51 extends radially outward of the elastic structure 50 , the convex ring 51 is located outside the sleeve 40 and abuts against the bottom of the sleeve 40 . In this way, by arranging the convex ring 51, the elastic structure 50 and the sleeve 40 are made more compact, and the sealing performance is better. The top of the cylinder body 10 is provided with a groove 11 , and the convex ring 51 of the elastic structure 50 is clamped in the groove 11 . In this way, through the cooperation between the convex ring 51 of the elastic structure 50 and the groove 11 of the cylindrical body 10 , the elastic structure 50 and the cylindrical body 10 can be relatively limited and have better sealing performance.

The outer diameter of the elastic structure 50 gradually increases from close to the cylindrical body 10 to away from the cylindrical body 10 . In this way, by setting the outer diameter of the elastic structure 50 to gradually increase from close to the cylindrical body 10 to far away from the cylindrical body 10 , the interference fit between the elastic structure 50 and the sleeve 40 can be better achieved.

The end of the elastic structure 50 facing the cylinder 10 is provided with a sealing hole 52, and the cone head 20 is clamped in the sealing hole 52; The diameter D2 of the sealing hole 52 is gradually increased from the distance from the cylindrical body 10 to the close to the cylindrical body 10 , and the diameter D2 of the sealing hole 52 is smaller than the outer diameter D1 of the corresponding position of the cone head 20 . In this way, by setting the corresponding relationship between the diameter D2 of the sealing hole 52 of the elastic structure 50 and the outer diameter D1 of the cone head 20 , the interference fit between the elastic structure body 50 and the cone head 20 can be better achieved.

The elastic structure 50 includes a connected elastic structure head 55 and an elastic structure rod 56 . The outer diameter D3 of the elastic structure head 55 is larger than the outer diameter D4 of the elastic structure rod 56 . The sleeve 40 includes a connected sleeve head 45 and a sleeve rod 46. The outer diameter and inner diameter D5 of the sleeve head 45 are larger than the outer diameter and inner diameter D6 of the sleeve rod 46. The elastic structure head 55 The elastic structure body 56 is clamped in the sleeve head 45 , the elastic structure rod 56 is clamped in the sleeve rod 46 , and the outer diameter D3 of the elastic structure head 55 is larger than the inner diameter D5 of the sleeve head 45 . The outer diameter D4 of the rod portion 56 is larger than the inner diameter D6 of the sleeve rod portion 46 . In this way, through this arrangement, the interference fit between the elastic structure 50 and the sleeve 40 can be better achieved.

In this embodiment, the outer peripheral surface of the sleeve head 45 is a hexagon, but it is not limited to a hexagon, and may also be other polygonal structures such as an octagon. In this way, by setting the outer peripheral surface of the sleeve head 45 to be a polygon, a larger frictional force can be generated when the sleeve 40 is rotated, which facilitates the installation and removal of the sleeve 40 .

Example 2

Please understand with reference to FIG. 6 and FIG. 7 , the structure of the prefilled syringe provided in this example is basically the same as that of Example 1, the difference is that the end of the sleeve 40 away from the cylinder body 10 is provided with a limit table 41 to limit the The position platform 41 is disposed on the inner surface of the side wall of the sleeve 40 and extends inward along the radial direction of the sleeve 40 . In this way, by providing the limiting platform 41 , the elastic structure 50 can be limited in the axial direction of the sleeve 40 , so that the elastic structure 50 can extend and deform toward the cone head 20 and the cylinder body 10 as far as possible.

Although specific embodiments of the present invention have been described above, those skilled in the art will understand that these are merely illustrative and the scope of the present invention is defined by the appended claims. Those skilled in the art can make various changes or modifications to these embodiments without departing from the principle and essence of the present invention, but these changes and modifications all fall within the protection scope of the present invention.

Claims (10)

1. a prefilled syringe comprising a cylinder and a cone head, the cone head is arranged on the top of the cylinder and communicated with the cylinder, it is characterized in that, the prefilled syringe also comprises: a fixing seat, the fixing seat is arranged on the top of the cylinder, and the fixing seat is arranged around the cone head; a sleeve, one end of the sleeve is located in the fixing seat and is detachably connected with the fixing seat; an elastic structure body, the elastic structure body is clamped in the sleeve, and the elastic structure body is in interference fit with the side wall of the sleeve, the cone head is clamped in the elastic structure body, and The outer wall of the cone head is in interference fit with the elastic structure. 2. The prefilled syringe according to claim 1, wherein the elastic structure comprises a connected elastic structure head and an elastic structure rod, and the outer diameter of the elastic structure head is greater than The outer diameter of the rod portion of the elastic structure. 3. The prefilled syringe of claim 2, wherein the sleeve comprises a connected sleeve head and a sleeve stem, and the outer diameter and the inner diameter of the sleeve head are larger than the The outer diameter and inner diameter of the sleeve rod, the elastic structure head is clamped in the sleeve head, the elastic structure rod is clamped in the sleeve rod, and the elastic The outer diameter of the head of the structural body is larger than the inner diameter of the head of the sleeve, and the outer diameter of the rod of the elastic structure is larger than the inner diameter of the rod of the sleeve. 4. The prefilled syringe of claim 3, wherein the outer peripheral surface of the sleeve head is polygonal. 5 . The prefilled syringe according to claim 1 , wherein the end of the sleeve away from the cylindrical body is provided with a limiting platform, and the limiting platform is arranged inside the side wall of the sleeve. 6 . The surface extends inward along the radial direction of the sleeve, and the top of the elastic structure abuts against the bottom of the limiting platform. 6 . The prefilled syringe according to claim 1 , wherein a convex ring is provided at one end of the elastic structure body close to the cylinder body, and the convex ring is radially outward of the elastic structure body. 7 . Extending, the protruding ring is located outside the sleeve and abuts against the bottom of the sleeve. 7 . The prefilled syringe according to claim 6 , wherein a groove is provided on the top of the barrel, and the convex ring of the elastic structure is clamped in the groove. 8 . 8 . The prefilled syringe of claim 1 , wherein the outer diameter of the elastic structure gradually increases from being close to the barrel to being away from the barrel. 9 . 9 . The prefilled syringe according to claim 1 , wherein a sealing hole is provided in one end of the elastic structure facing the cylinder, and the cone head is clamped in the sealing hole; 10 . The outer diameter of the cone head gradually increases from being away from the cylinder body to approaching the cylinder body, the diameter of the sealing hole gradually increases from being away from the cylinder body to approaching the cylinder body, and the diameter of the sealing hole is less than The outer diameter of the corresponding position of the cone head. 10. The prefilled syringe according to any one of claims 1 to 9, wherein the inner surface of the fixing seat and the outer surface of the sleeve are in threaded engagement.