DE1996132U - PISTON SYRINGE FOR REPLACEABLE AMPOULES. - Google Patents

Description

P.A.275 98HUÄS / S

company

Kirchner & Wilhelm
Stuttgart - S

Schlosserstrasse 31

Piston syringe for exchangeable ampoules

The invention relates to a plunger syringe for exchangeable ampoules, in particular medical syringes. With the mentioned versions of this The type of housing part that receives the ampoule is closed off by an attachment that is firmly connected to it, which is used to hold the cannula holder.

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However, it is always necessary to change the ampoule required to take out the cannula for enough space to create for the ampoule «This procedure is (however, very cumbersome, in addition, the cannula has to be used every time touched again with the EtCad.

In order to facilitate the way of working with such a syringe, according to the invention the attachment is mounted on the housing so that it can be longitudinally displaced between two end stops. If an ampoule is now to be inserted or removed, is it no longer necessary _? to remove the cannula, rather you move the attachment with the cannula and thus get enough free space for the ampoule.

A guide slot and a bolt are preferably used as a guide and stop between the housing part and the extension intended. If you use the slot as a bayonet lock

forms, you can lock the approach in the closed position of the syringe, so that you do not accidentally

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when the syringe is pulled out, the attachment also moves. The approach is preferably designed in the form of a sleeve and has a knurling for better grip Mistake. In order to achieve a fixation of the approach in one position or the other au, acts after one Another feature of the invention is on the housing part

supporting compression spring on him, with at least in

the closed position has a notch for the approach

see is. Here, the compression spring can be supported on a cap directly on Kanül enbund wherein Lich zusätz during advancement of the batch the cannula through which each of the ampoule is squeezed out. Preferably, the hub and the cannula holding device consist of

j one piece, the approach being removable from the housing part

is. In the known embodiments was namely so far the cannula holding device is screwed onto the attachment, however, you can save yourself the arrangement of the thread after it by the displaceability of the approach is easily possible - this also, removable to design.

I ¹ Ur such an embodiment the guide slot · opens at the end opposite the needle end of the hub, and is approximately Z-shaped design at its mouth.

The drawing shows an exemplary embodiment of the invention. They represent:

Figure 1 shows the broken longitudinal section of the front end of a plunger syringe

FIG. 2 shows an illustration according to FIG. 1 of another embodiment with an exploded view Syringe housing and attachment.

On the housing part 1 of a plunger syringe that receives the ampoule, not shown, is longitudinally displaceable an approach 2 arranged. The housing is provided with a bayonet-shaped guide slot 5,

in which a bolt 4 connected to the extension 2 intervenes. The front end 5 of the projection 2 has in the usual V / ice a threaded sleeve on which the Holding device 6 for the cannula 7 is screwed on.

To insert the ampoule, the sleeve-shaped one is designed Approach 2 rotated slightly so that the bolt 4- can emerge from the angled part 8 of the guide slot 3 and then moved in the direction of the cannula 7. As a result, the lower housing part 1 is largely exposed and also the cannula 7 from the ampoule, not shown pulled out so that it can be easily replaced.

In Fig. 2, compared to FIG. 1, there is an even further improved one

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and the cannula holding device 10 is in one piece and is

the likewise sleeve-shaped approach 9 with knurling Mistake. The housing 12 is designed somewhat differently here at its lower end and has a shoulder 14 which

to support a compression spring 15 »this in turn is provided at its free end with a cap 16 which is supported on the collar 22 of the cannula 7. Through this is achieved on the one hand, that? the cannula 7 when advancing of the approach 9 printed out of the ampoule

, and on the other hand there is a determination of the

Approach 9 in its two positions. For this purpose is the

In the approach 9 provided FührschJitz 17 εαι provided its front end with an angled Λβ and formed at its rear end 19 Z-shaped. In the rear YerSchlußstellung, as shown for example in Fig. 1, the compression spring 15 is tensioned and the bolt 20 arranged on the housing 12 engages in the angled 18 of the guide slot 17, so that the approach in this position under the pressure of feather

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If the approach 9 is rotated accordingly, he can then Slide forward until the bolt 20 strikes the Z-shaped part 19 of the guide slot 17. In this position

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the ampoules are then changed.

Another rotation of the approach 9 comes The guide pins then end in the parallel-laid Sliding part 21 which opens outwards and enables the attachment 9 to be removed in order to replace the cannula 7.

Claims (7)

P.Ä. 275 989 * 14.5.68 Claims: 1. Piston syringe for exchangeable ampoules, in particular medical syringe, whose housing part, which receives the ampoule, is held by a cannula holding device having approach is completed, characterized in that the approach (2, y) Can be moved lengthways between two end stops on Housing (1.12) is mounted. 2. Syringe according to claim 1, characterized in that as a guide and stop between the housing part (1, 12) and attachment (2, 9) a guide slot (3, 17) and a bolt (4, 20) are provided. 3. Syringe according to claim 2, characterized in that the slot (3, 17) is designed as a bayonet lock is. 4-, syringe according to one of the preceding claims, characterized in that the extension (2, 9) is sleeve-shaped and in particular on the outside is provided with an Eändelung (11). 5. Syringe according to one of the preceding claims, characterized in that a compression spring supported on the housing part (12) is placed on the extension (9) (15) acts, at least in the closure division of the approach (9) a notch (18) is provided for the approach (9). 6. syringe according to claim 5, characterized in that that the compression spring (15) extends over a cap (16) supported on the cannula collar. 7. Syringe according to one of the previous claims, characterized in that the approach (9) and the cannula holding device (10) in one piece 1996TJ2 exist, the projection (9) being removable from the housing part (12). 8 * syringe according to one of claims 5 and. 7i thereby characterized in that the guide slot (17) on the end of the extension (9) opposite the cannula (7) opens outwards and at its mouth is designed approximately Z-i '.