KR20030095558A - Needle holder positioning structure for a safety syringe - Google Patents

Abstract

The needle holder positioning structure for a safety syringe includes a syringe having a neck that forms a protruding ring for positioning at an upper end, and a fork-shaped elastic sleeve is integrally formed upwardly at the lower inner edge of the neck. The rear end of the elastic sleeve forms a hook member on the inside, and a lower end of the needle holder for accommodating the needle is provided with a funnel hole therein, the funnel hole having an extension hole at its distal end. A guide surface is formed on the outer side of the lower end of the holder, and a recess corresponding to the hook member is formed on the outer surface of the needle holder.

Description

Needle holder positioning structure for safety syringes {NEEDLE HOLDER POSITIONING STRUCTURE FOR A SAFETY SYRINGE}

The present invention relates to a needle holder positioning structure for a safety syringe, and more particularly to an inexpensive structure that allows for precise positioning of the needle.

Taiwan Patent Publication No. 332433 discloses a good safety syringe structure having a needle holder positioning structure as shown in FIGS. At the rear end of the needle holder 5 a funnel hole 51 is formed, which funnel hole expands to form an arrow cavity 52, which is the piston head of the piston 6. For accommodating the arrow-shaped engagement member 62 installed at the front end of the head 61. After injection, the engagement member 62 and the cavity 52 are integrally engaged. Thus, when the piston 6 is pulled back, the needle holder 5 together with the needle 53 is detached from the neck 71 of the syringe 7 and the needle 63 is inside the body 72 of the syringe 7. Safety is ensured by not pulling it out to expose it to the outside.

In addition, since the patent holder is positioned on the neck 71 of the syringe 7, the needle holder 5 is used instead of the plastic material that is commonly used so that the needle holder 5 can be pulled back smoothly. It must be molded from an elastic rubber material. However, since the rubber is much more expensive than plastic, and the elastic nature of the rubber can affect the positioning of the needle 53, the patent has the disadvantage of being expensive and inadequate positioning.

There are other related prior art patents, which include US Pat. Nos. 4,339,939, 5,039,059,130, 58,79339, 5,523,77, 5,523,1, 5,252, 2,590, 269, 5,953,595. 4737144, 5344403, and 5569203.

1 is a cross-sectional view of the structure of an embodiment of the present invention prior to bonding;

2 is a cross sectional view of a structure of an embodiment of the present invention after bonding;

3 is a schematic view showing an embodiment of the present invention assembled to a safety syringe,

4 is a schematic diagram showing a process of pulling back an embodiment of the present invention,

5 is a schematic view showing a process of mounting the needle sleeve in an embodiment of the present invention in the reverse direction,

6 is a schematic diagram showing the needle holder positioning structure of Publication No. 332433,

7 is a schematic diagram showing a process of pulling the needle holder of the notification 332433 in the reverse direction,

8 is another schematic view showing a process of pulling the needle holder in the notice 332433 in the reverse direction,

FIG. 9 is another schematic view showing a process of pulling the needle holder of Publication No. 332433 in the reverse direction;

FIG. 10 is another schematic diagram illustrating a process of pulling the needle holder of the notification 332433 in the reverse direction.

<Brief description of symbols for the main parts of the drawings>

1: syringe

2: needle holder

11: neck

12: ring

13: sleeve

14: hook member

15: main body

21: needle

22, 23: hole

24: guide surface

25: recess

31: home

The main object of the present invention is to provide a needle holder positioning structure for a safety syringe, which is low in manufacturing cost.

Another object of the present invention is to provide a needle holder positioning structure for a safety syringe, which makes it possible to precisely set the position of the needle.

In order to achieve the above object, the present invention is a fork-shaped elastic sleeve (sleeve) and the hook member (hook member) is integrally formed upwardly on the lower inner edge of the neck of the syringe, the needle holder is provided with a corresponding recess The needle holder is coupled to the neck of the syringe by hook-type engagement and elastic holding force. In addition, the needle holder may be made of a plastic material. Plastic needle holders are inexpensive and allow precise positioning compared to rubber needle holders.

Other features and advantages described above with respect to the present invention will be more clearly understood from the following detailed description and the accompanying drawings.

1 and 2, the present invention comprises a syringe 1, which has a neck 11 which forms a protruding ring 12 for positioning at the upper end. The fork-shaped elastic sleeve 13 is integrally formed in the lower end inner edge of this neck part 11, and the hook member 14 is formed in the back end of this sleeve. A funnel-shaped hole 22 is provided at the lower end of the needle holder 2 for accommodating the needle 21, and an expansion hole 23 is formed at the end of the hole. A guide surface 24 is formed on the outer side of the lower end of the needle holder 2, and a recess 25 corresponding to the hook member 14 is formed on the outer side of the holder.

Referring to FIG. 3, the positioning protruding ring 12 serves to position the needle sleeve 3. At the front end of the piston head 41 of the piston 4 a coupling member 42 is provided to retract the needle holder 2 together with the needle 21, which is a funnel of the needle holder 2. Corresponds to the mold hole 22 and the expansion hole 23. However, since such a structure is not the subject of the present invention, the structure will not be described in detail here. 3 and 5, a groove 31 corresponding to the hook member 14 is provided at the outer edge of the needle sleeve 3. When the needle 21 is pulled back toward the inside of the syringe body 15, the needle sleeve 3 is fitted in the reverse direction so that the hook member 14 is held in the groove 31, thereby protruding the needle. And to prevent the leakage of possible residual blood in the syringe 1 to ensure safety.

Based on the above configuration, the funnel-shaped hole 22 of the needle holder 2 is adapted to be resiliently retracted inwards, and the guide surface 24 is guided into the neck 11 of the syringe 1 and is concave. The part 25 holds the hook member 14 of the syringe 1, and the elastic sleeve 13 reliably sets the position of the needle holder 2 by its inward holding force. (See FIG. 2). After the injection, if the piston 4 is pulled back (the relationship between the piston 4 and the needle holder 2 has been described above), this back pulling force biases the needle ( 21 can be pulled back towards the inside of the syringe body 15. Thus, the present invention utilizes the engagement force and the elastic retaining force to couple the needle holder 2 to the neck 11 of the syringe 1 and directly mold by plastic injection molding without the need for the use of a rubber material as in the prior art. In addition to reducing the cost, this can more precisely set the position of the needle 21 with a plastic needle holder.

While the present invention has been described and illustrated with reference to preferred embodiments, it is to be understood that this invention is not limited to the details of such embodiments and that many modifications can be made within the scope of the appended claims.

According to the invention, the needle holder is coupled to the neck of the syringe by means of hooking force and elastic restraint force, and is formed directly by plastic injection molding without the need for using a rubber material. Therefore, in addition to reducing the manufacturing cost, it is possible to more precisely set the position of the needle with a plastic needle holder.

Claims (2)

And a syringe having a neck configured to form a protruding ring for positioning at an upper end thereof, wherein a fork-shaped elastic sleeve is integrally formed upwardly at a lower inner edge of the neck, and a rear end of the elastic sleeve is hooked at an inner side thereof. The lower end of the needle holder for accommodating the needle is provided with a funnel-shaped hole in the inner side, the funnel-shaped hole is formed at the end of the expansion hole, the lower end of the needle holder is formed with a guide surface on the outside And a recess corresponding to the hook member is formed on an outer surface of the needle holder. The needle holder positioning structure according to claim 1, wherein the needle sleeve fitted to the positioning protruding ring has an outer edge provided with a groove corresponding to the hook member.