DE3106988A1 - Hypodermic syringe - Google Patents

Abstract

Holders for disposable syringes are used when the companies supply the medication in the barrel of the syringe. Each company has a different model and, after injection, the barrel and the holder are discarded. The invention is based on providing a holder for disposable syringes, which are supplied empty, i.e. without medication. The holder is not discarded and can be used as often as desired. It is adapted to the syringe barrels available on the market, so that the huge design costs no longer apply. The holder is constructed in such a way that savings are made to the extent of 50% in terms of syringe material and 30% in terms of packaging. Another important advantage lies in the fact that the holder can receive syringes of three different sizes in terms of diameter and volume. It is not therefore necessary to produce a holder for each syringe size (2, 5, 10 ml).

Description

In the patent application P. 30 28 432.3 and the utility model application G. 80 20 132.7 a holder is described in which syringe cylinders of different diameters and volumes can be used. The syringe barrels differ in their construction from the conventional syringe barrels.

This additional application is a modification of the bracket already described in the main application. With this construction of the holder, syringe cylinders of the disposable syringes available on the market can also be inserted with different diameters and volumes. The advantage of this method is that no new shapes have to be made for the cylinder. The molding costs are very high because of the large number of cavities in the mold. For a set of syringe barrels for 2, 5, 10 and 20 ml they are around one million DM. The high molding costs could prevent the syringe manufacturers from introducing an injection syringe with a holder, although 50% of the material for the syringe and 30% of the packaging are saved can. Further advantages and the state of the art are described in the main application.

The present invention is therefore based on the object of creating a syringe holder into which commercially available syringe cylinders with plungers of different diameters and volumes can be inserted.

In Fig. 3, a syringe cylinder (2) of the disposable syringes available on the market is shown. It consists of the cylinder (2), two wing-like extensions (4) and the syringe cone. The syringe holder (1) consists of a cylindrical part (9) which guides the piston rod (3) with a telescopic casing (10). Towards the cylinder, recesses (5, 6, 7) lying behind one another are attached to the holder (2) in which the syringe cylinders (2) can be locked with their extensions (4).

The recess (5, 6, 7) are different in depth and width and adapt to the diameter and the extensions (4) of the cylinder. The largest recess (5) is at the beginning of the cylinder and the smallest (7) is at the end.

According to a modification of the invention, the syringe cylinders are provided with a parallel edge strip (13) which, instead of the extensions, locks the cylinder in the holder.

In a further modification, the cylinder (14) has a collar that fits into the recesses (5, 6, 7) in the holder.

The advantages of the holder, which can accommodate different syringe cylinders in diameter and volume, are described in the main application.

Due to this modification of the holder, in which commercially available cylinders can also be inserted, there are no molding costs. This is an important factor for pricing, especially when there is a material saving of 50% in syringe production and 30% in packaging.

The production of the piston is 40% cheaper in terms of injection molding compared to the conventional piston rod with push button and piston.

Claims (6)

1. Injection syringe, consisting of a holder and a syringe cylinder with plunger (2a) that can be fastened to the holder, the holder having a guide for the plunger rod, according to patent application P 30 28 432.3, G 80 20 132.7 characterized in that on the holder (1) on the side facing the syringe cylinder (2) there are recesses (5, 6, 7) behind one another, which are provided for receiving syringe cylinders (2) of different diameters and volumes. 2. Injection syringe according to claim 1, characterized in that the recess (5, 6, 7) have different depths and widths which are adapted to the different diameters of the syringe cylinder (2) and their extensions (4) in the manner that to the surface of the holder (1) facing the syringe cylinder (2) has the largest recess (5) in depth and width at the beginning, followed by the recesses for the recesses (6, 7) which are smaller in diameter and volume. Accordingly, the smallest recess (7) for the smallest cylinder (2) is at the end. 3. Injection syringe according to claim 1 and 2, characterized in that the cylinders (2) carry lateral extensions (4) which are adapted to the recesses (5, 6, 7). 4. Injection syringe according to claims 1-3, characterized in that the cylinders (2) carry lateral edge strips (13) which are adapted to the recesses (5, 6, 7). 5. Injection syringe according to claims 1-4, characterized in that the cylinders carry a collar (14) which is adapted to the recesses. 6. Injection syringe according to at least one of claims 1-5, characterized in that the holder (1) has only one recess (5) for the largest syringe cylinder (2) and the syringe cylinder of smaller diameter at its open end has a flange (15) with extension (4) adapt to the largest recess (5).