WO2004080513A1

WO2004080513A1 - Syringe with self-destruction structure

Info

Publication number: WO2004080513A1
Application number: PCT/CN2003/000716
Authority: WO
Inventors: Qingfeng Wu; Nan Wu
Original assignee: Qingfeng Wu; Nan Wu
Priority date: 2003-03-12
Filing date: 2003-08-25
Publication date: 2004-09-23
Also published as: CN2605859Y; AU2003261575A1

Abstract

The invention relates to a syringe with self-destruction structure. The syringe comprises a coat (1), a core rod (2), and a self-locking piece (3). A barb (31) is provided on one side of the self-locking piece (3). An apical leg(32) is provided beneath the self-locking piece (3). The chutes (21) are axially provided on the core rod (2). The width of chutes (21) is a little larger than the thickness of the self-locking piece (3). At least one shoulder (211) is provided on inner side of the chute (21). The self-locking piece (3) is inserted into the chute (21) of the core rod (2) far away from a needle tip. A barb (31) of the self-locking piece (3) extends beyond the chute (21). The coat (1) is coated outside the core rod (2) and the self-locking piece (3). The structure of the self-locking piece (3) according to the invention is simple. The selflocking piece (3) is easy to be made, and costs less. Piercing the coat after being used can destroy the syringe. The syringe according to the invention is applicable especially for injecting bacteria.

Description

Sliding lock self-destructing syringe

Technical field

The present invention relates to the technical field of medical instruments, and in particular, to a sliding lock self-destructing syringe. Background technique

In the prior art, in order to prevent the self-destructing device from engaging and self-destructing in advance during assembly and transportation, most self-destructing syringes are provided with a protective plug on the core rod to fix the position of the core rod relative to the back cover of the jacket. In this way, the core rod cannot be assembled to the end, resulting in residual air in the syringe before the drug is drawn; moreover, the structure of such a slide-lock self-destructing syringe is more complicated.

It is also inconvenient to use. In order to overcome the above disadvantages, the applicant in Chinese patent ZL 01258513. 0 proposed a self-destructing syringe which is convenient to use. The self-destructing syringe can make the puncturing system into a standard part. Although this self-destructive syringe has many advantages, it still has disadvantages such as complex structure and high cost. Summary of the Invention

The purpose of the present invention is to provide a sliding lock self-destructing syringe which can avoid the disadvantages of the prior art, has a simple structure and assembly, and has a low cost.

The technical problem to be solved by the present invention can be solved by adopting the following technical solutions: Design and manufacture a sliding lock self-destructing syringe, which includes a jacket, a core rod, and a self-locking piece; the self-locking piece has a barb on one side, and the self-locking piece is bent at a position below the barb as Top leg; the core rod is provided with a sliding groove in the axial direction, and the width of the sliding groove matches the thickness of the self-locking piece, or is slightly larger than the thickness of the self-locking piece, and at least one shoulder is provided on the inner side of the sliding groove; When assembling, the self-locking piece is embedded in an end of the slide groove away from the needle tip, and the barbs of the self-locking piece extend out of the slide groove. The outer sleeve is sleeved outside the core rod and the self-locking sheet.

In the sliding lock self-destructing syringe described above, the two corners of the front portion of the self-locking sheet are preferably rounded. Of course, other forms of chamfering can also be used.

In the above-mentioned sliding lock self-destructing syringe, when the shoulders are more than one, it is preferable that the shoulders are substantially uniformly distributed.

In the above-mentioned sliding lock self-destructing syringe, the self-locking sheet is preferably made of an elastic metal sheet, of course, a polymer membrane with a higher strength, such as an ABS membrane, can also be used.

Compared with the prior art, the sliding lock self-destructing syringe of the present invention has the following technical effects:

1. The self-locking disc is simple in structure, easy to manufacture and assemble, and low in cost;

2. Its self-destruct function is realized by piercing the jacket. After the jacket is pierced, the needle will be scrapped to avoid repeated use of the needle and the syringe. Therefore, the vaccine syringe with fixed needle is more practical.

3. The self-locking piece is embedded in the chute of the chip, which belongs to a hidden design and has no effect on the appearance of the syringe. BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a schematic diagram of a jacket of a sliding lock self-destructing syringe of the present invention;

2 is a schematic view of a core rod of the syringe;

Fig. 3 is a sectional view taken along A-A of Fig. 2;

4 is a schematic front view of the self-locking piece 3 of the syringe;

5 is a schematic right side view of the self-locking piece;

6 is a schematic front view when the syringe is assembled;

7 is a schematic side view of the syringe when the assembly is completed;

8 is a schematic diagram when the syringe finishes drawing medicine;

Fig. 9 is a schematic diagram when the syringe completes the injection.

The present invention will be further described in detail below with reference to the accompanying drawings by using specific embodiments. However, the protection scope of the present invention is not limited to the specific implementation manner, and any improvement or modification made according to the spirit of the present invention still belongs to the protection scope of the present invention. detailed description

1 to 6 show a specific embodiment of a slide-locking self-destructing syringe. The syringe includes a casing 1, a core rod 2, and a self-locking piece 3. The self-locking piece 3 has barbs 31 on the side. The self-locking piece 3 is bent into a top leg 32 at a position below the barb 31, and the self-locking piece 3 is made of an elastic metal sheet. The core rod 2 has a sliding groove 21 in the axial direction. The width of the sliding groove 21 is equal to or slightly larger than the thickness of the self-locking piece 3. At least one shoulder 211 is provided in the sliding groove 21. When assembling, the self-locking piece 3 is embedded in an end of the slide groove 21 away from the needle tip, and the barbs 31 of the self-locking piece 3 extend out of the slide groove 21. The outer sleeve is sleeved on the core rod 2 and self-locking piece 3.

At the moment of drawing the medicine, the core rod 2 is pulled backward with respect to the outer casing 1. As shown in FIG. 6 and FIG. 7, the barbs 31 of the self-locking piece 3 penetrate into the inner wall of the outer casing 1 to drive the The self-locking piece 3 slides forward in the chute 21. As shown in FIG. 8, when the medicine drawing is completed, the self-locking piece 3 slides to the front of the shoulder 211 of the chute 21.

During the injection, the core rod 2 is pushed to move forward, and the shoulder 211 in the chute 21 is pressed against the top foot 32 of the self-locking piece 3 to drive the self-locking piece 3 to move forward. At the end of the injection, as shown in FIG. 9, the core rod 2 is already close to the back cover 11 of the outer jacket 1. At this time, the outer sleeve 1 and the core rod 2 can no longer perform relative movement, that is, the syringe of the present invention has realized self-locking. If the core rod 2 is pulled backward when trying to draw medicine again, the barbs 31 of the self-locking piece 3 pierce into the inner wall of the outer casing 1, the top leg 32 is pushed by the shoulder 211, and the core rod 2 Cannot move backwards relative to the outer casing 1 so as to draw in the liquid medicine. If the core rod 2 is pulled back forcibly, the self-locking piece 3 will pierce the outer casing 1 and destroy it, and the core rod 2 may also be destroyed. .

In order to reduce the resistance when the self-locking piece 3 slides in the chute 21, the two corners of the front portion 33 of the self-locking piece 3 have a certain circular arc chamfer. In order to meet the requirements of various drug extraction volumes, for example, when the liquid medicine is fully filled or only half the liquid medicine is pumped, a plurality of shoulders 211 may be provided in the chute 21 provided in the present invention, and each shoulder 211 may be uniformly distributed, or It is unevenly distributed to achieve the purpose of controlling the amount of liquid medicine to be drawn. Of course, this purpose can also be controlled by adjusting the length of the self-locking sheet 3.

Claims

Rights request

1. A sliding lock self-destructive syringe, which comprises a jacket (1) and a core rod (2), which are characterized by:

The syringe further includes a self-locking piece (3), a barb (31) is provided on one side of the self-locking piece (3), and the self-locking piece (3) is located below the barb (31) Bent to the top foot (32);

The core rod (2) is provided with a sliding groove (21) along the axial direction, and the width of the sliding groove (n) is equal to or slightly larger than the thickness of the self-locking piece (3), and one side of the sliding groove (21) is provided At least one shoulder (211);

When assembling, the self-locking piece (3) is inserted into an end of the slide groove (21) of the core rod (2) away from the needle tip, and the barbs (31) of the self-locking piece (3) extend out of the slide groove. (21), the outer sleeve (1) is sleeved outside the core rod (2) and the self-locking piece (3).

2. The sliding lock self-destructing syringe according to claim 1, characterized in that: two corners of the front part (33) of the self-locking piece (3) are round chamfers.

3. The sliding lock self-destructive syringe according to claim 1 or 2, characterized in that: the shoulders (211) are two or more, and the distribution of each shoulder (211) is uniform .

4. The sliding lock self-destructing syringe according to claim 1 or 2, characterized in that Because: the shoulders (211) are two or more, and the distribution of each shoulder (211) is uneven.

5. The sliding lock self-destructing syringe according to claim 1, wherein the self-locking sheet (3) is made of an elastic metal sheet.