CN2279921Y - Rubber piston of syringe - Google Patents

Abstract

The utility model relates to a rubber plug for syringes. A convex point is distributed on the enclosed top surface of a sealing ring, and the convex point is sheathed in the top end of a push rod of a syringe, having sealing function. In addition, space is formed by the convex point and the casing of the syringe after the push rod is pushed in the sealing ring, so that the push rod can be freely pushed and pulled. The shape of the top surface of the rubber plug for syringes can be similar to the shape of the top end of the casing of the syringe, which causes the residual quantity of injection liquid to be reduced. The utility model is especially suitable for syringes of large specification, which are more than 60 ml, and can also be applied to similar devices.

Description

The syringe plug

This utility model relates to the piston that a kind of syringe is used.

Veterinary syringe is generally made with metal, and specification is also bigger, because the random pendulum of domestic animal is touched in the operation, strength is big, Luer's syringe is broken attack, and cost is than higher.For this reason, use plastic injector for temporary use instead,, be added with sealing ring on the push rod top in order to solve its sealing problem, but for the bigger syringe of this specification, generally more than 60ml, because the air extrusion when advancing, cause and inject end, when push rod pulls outward, special effort.

The purpose of this utility model provides a kind of piston, not only seals, and makes the push rod push-and-pull freely of syringe, the syringe of especially big specification.

Realize this utility model purpose syringe plug, comprise a sealing ring, the end face sealing of sealing ring, its technical characterstic is to have three salient points on the end face at least.

Plug is promptly made by rubber, is inserted in the push rod top, and the effect of salient point is to make push rod to advance the back and the shell of syringe to form a space, just push-and-pull freely of push rod like this.

Four salient points of uniform distribution get final product on the general end face.

End face can be the plane, also can be curved surface, should consider from the residual quantity that reduces injection as far as possible, looks the decision of syringe shell end shape.

Below in conjunction with description of drawings.

Fig. 1 is a structural representation of the present utility model, also is an embodiment.

Fig. 2 is that A among Fig. 1 is to view.

Among the figure: 1 sealing ring, 2 salient points

The end face of plug is " A " font, and is similar substantially to the vertical shape of shell, and four salient points are evenly distributed on the end face, when push rod advances syringe shell, between plug and shell top because the effect of salient point forms a very little space, inject end after, the injection residual quantity is seldom.

Advantage of the present utility model: not only have sealing function, and can make freely push-and-pull of push rod, especially Be applicable to the syringe of the above big specification of 60ml. Also can use for similar device the utility model.

Claims (3)

1, a kind of syringe plug comprises a sealing ring, it is characterized in that having three salient points at least on the end face of sealing ring sealing.

2, plug according to claim 1, being characterised in that has equally distributed four salient points on the described end face.

3, plug according to claim 1 and 2 is characterised in that described end face can be the plane, also can be curved surface.

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