Syringe for medical purposes

Details Syringe for medical purposes Syringe for medical purposes

1987-06-16

1988-11-01

Yasko, John D.

Surgery

Means for introducing or removing material from body for...

Treating material introduced into or removed from body...

A61M 5325

Patent

active

047817011

DESCRIPTION:

BRIEF SUMMARY
CROSS REFERENCE TO RELATED APPLICATIONS

This application is a national phase application corresponding to No. PCT/DE86/00285 filed July 11, 1987.


FIELD OF THE INVENTION

The invention relates to a syringe for medical purposes, with a needle attachment fitted on the cylindrical outlet of the syringe body forming a connection neck for attaching the syringe needle, the attachment having a connection piece, notched in at the cylinder nozzle and connecting the needle attachment to the syringe cylinder, whereby the needle attachment is made of an elastic rubber material and the connection piece is made of a synthetic material considerably more rigid than the rubber material.


BACKGROUND OF THE INVENTION

Syringes of this type are described in the not published European patent application No. 84 100 711.5 and have the advantage that the needle attachement and the connection piece can be mounted easily even when the syringe is already filled and can afford a safe sealing of the syringe cylinder. For assembly it is sufficient to fit the coupling piece over the attachment placed on the cylinder nozzle and to push until it is securely lodged at the cylindrical nozzle. The syringe needle can be vulcanized in the connection neck protruding from the coupling piece or it can be glued therein with a heat-resistant glue. It also can be omitted at first, and just before the syringe is used, can be inserted in or fitted on the connection neck, for which purpose a luer cone can be provided onto which a needle guide sleeve carrying the needle can be fitted.
Generally, the luer cone can be recommended also in the case of differently attached needles because it makes it possible to fit over the syringe needle a cap receiving and protecting the same. If the syringe needle is attached on the connection neck only immediately before the use of the syringe, the exit of the needle attachment channel for the passage of the injectable substance can be closed by a so-called tip-cap, fitted on the luer cone and having a central projection reaching into the channel and sealing same.
In such syringes, the problem arises that in order to provide a good and reliable seal at the cylinder nozzle, the needle attachment is usually made of soft elastic material, which leads, on the other hand, to insufficient stiffness in the area of the connection neck to safeguard the mechanical stability of the needle.


OBJECT OF THE INVENTION

It is the object of the invention to provide an improved syringe of the afore-described kind, so that even when the needle attachment is sufficiently soft and elastic to provide a seal for the cylinder nozzle, the syringe is still held with sufficient mechanical stability at the connection neck.


SUMMARY OF THE INVENTION

This object is attained according to the invention by providing the connection piece with a collar which surrounds the connection neck in a tightly sealing manner and thereby confers mechanical rigidity to the same.
The collar surrounds the connection neck like a jacket and is in itself rigid enough to safely prevent bending deformations of the connection neck, thereby conferring a high mechanical stability to the needle junction at the needle attachment. Due to its soft elastic characteristics, the connection neck provides a secure seal against the collar, so that, in the case of the syringe according to the invention, it is possible not only to vulcanize or glue the syringe needle in the connection neck, but also to affix it externally on the collar with a guide sleeve carrying the needle, whereby again it is recommended to shape the collar with a luer cone on its outer surface. Further, a preferred embodiment of the invention is characterized in that at the needle end the connection neck forms an elastic annular shoulder overlapping outwardly and radially the frontal annular surface of the collar up to the external jacket surface of the collar, forming an annular seal against a guide sleeve carrying the syringe needle, affixed to the collar. In addition, within the framework of the invention, i

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