Surgery – Container for blood or body treating material – or means used... – Having hollow needle or spike for piercing container or...
Reexamination Certificate
1997-05-01
2001-08-28
Nguyen, Anhtuan T. (Department: 3763)
Surgery
Container for blood or body treating material, or means used...
Having hollow needle or spike for piercing container or...
C604S905000
Reexamination Certificate
active
06280430
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a syringe device fixable on a flask, in particular a flask containing a liquid to be injected or a substance that has been lyophilized and that is to be mixed with a physiological liquid or with medication so that the mixture can be injected.
2. Description of Related Art
There exist known substances, particularly in the medical field, which need to be stored separately and which should be mixed only immediately prior to being injected into a patient, e.g. subcutaneously, intravenously, or into muscle. This applies in particular to medical substances which are prepared in lyophilized (freeze dried) form, or in powder form, and which need to be mixed with a solvent, e.g. physiological serum, for administration to a patient. In other cases, the two components that are mixed together may both be liquids, when the liquids cannot be stored for long periods of time when mixed together.
The most commonly used technique is to store the powder in a separate receptacle which is closed by a membrane or a leakproof plug that can be punctured by means of a needle. Then, using a syringe of standard type, a certain quantity of solvent is taken from a second receptacle and the appropriate quantity of solvent is injected into the first receptacle through the membrane. The content of the first receptacle is then mixed together and the same syringe is then used to suck up the mixture. The syringe is then ready for injecting the medication.
In other known techniques, the liquid, e.g. physiological serum, is already contained in the syringe. It then suffices to inject the liquid through the puncturable membrane into the receptacle containing the substance in powder form, to mix the substances together, and then suck the mixture back into the syringe.
However, that technique suffers from certain difficulties in use. In particular, when the flask containing the powder has a neck of small diameter, it is difficult to puncture the puncturable plug appropriately. An essential condition for extracting all of the liquid contained in the flask after the powder has been mixed with the solvent is for the puncturable plug to be punctured in its center and for the needle to be inserted as small a distance as possible into the flask. That also serves to avoid wetting the needle while mixing is being performed, thus leaving the needle in a condition suitable for being reused to inject the mixture into the patient. Unfortunately, as already mentioned, when the neck of the flask is of small diameter, this can be difficult to do. There also exists a non-negligible risk of the user, e.g. a nurse, pricking a finger while performing the above operation.
An object of the present invention is to provide a syringe device that is fixable on a flask and which ensures that the puncturable plug is punctured in its center and which also makes this operation very reliable and completely repeatable. Another object of the present invention is to provide such a device which can be fitted onto a flask commonly used for containing medicinal powders for mixing with a solvent, and in particular substances that have been lyophilized.
SUMMARY OF THE INVENTION
According to the invention, this object is achieved by a syringe device suitable for fixing on a flask that has a cylindrical body, an opening surrounded by a flange presenting a side face, and a puncturable plug closing said opening, the device being characterized in that it comprises a guide part suitable for co-operating with said flask, and a syringe provided with a needle and mounted to slide in said guide part, said guide part including an open first end having at its terminal portion a first internal guide surface suitable for co-operating with the cylindrical body of said flask, and fastening means for fastening said part to said flange, which means are set back relative to said first internal guide surface, said fastening means being activated while said device is being put into place on said flask, said guide part including a second end and a common portion suitable for receiving said syringe provided with means for providing guidance in translation to said syringe in said guide part in order to bring said syringe into an engaged position in which its needle punctures the puncturable membrane of the flask, said guide part also having a central orifice for allowing the end of said needle to pass through under the effect of said syringe moving in translation.
It will be understood that in this way, because of the presence of the guide surface at the end of the guide part co-operating with the cylindrical body of the flask over sufficient length, the guide part is accurately centered relative to the puncturable plug of the flask. Consequently, the end of the needle of the syringe is properly positioned facing the central portion of the puncturable plug of the flask, thereby enabling the plug to be punctured under optimum conditions when the syringe is pushed into the guide part. Also, since the syringe is guided in translation relative to the guide part, this ensures that the positioning of the needle relative to the plug is maintained while the syringe is moving. In addition, the presence of the fastening elements makes it possible to secure the guide part, and thus the syringe, to the flask, thus making it easier to maneuver the syringe relative to the flask. In particular, that makes it possible to monitor very accurately how far the syringe has been pushed into the guide part, and thus how far the tip of the needle has penetrated into the flask after the plug has been punctured, in order to ensure that such penetration is kept down to a minimum. Naturally, after the operation of mixing and then sucking the mixture back into the syringe, the syringe can be separated from the guide part.
Preferably, the first end of the guide part includes a second internal guide surface suitable for co-operating with the side wall of the flange of the flask, the fastening means being disposed between the first and second guide surfaces. The presence of these two guide surfaces makes it possible to reduce the length of the first guide surface while obtaining accurate centering of the guide part relative to the flask.
Also preferably, in a first embodiment, the means for guiding the syringe in translation in the guide part include sealing means for providing sealing between the inside face of the guide part and the body of said syringe.
In a second embodiment, the means for guiding the syringe in the guide part include at least one guide face formed in the inside face of the guide part and suitable for co-operating with a portion of the body of said syringe.
According to another characteristic of the invention, the guide part includes a plate element disposed substantially perpendicularly to the direction of displacement of the syringe and in which the central orifice is formed, the face of the plate directed towards the first end of the guide part being provided with a projecting annular rib surrounding the central orifice, whereby said rib is pressed against the plug of said flask while said fixing means co-operate with said flask.
Other characteristics and advantages of the present invention appear more clearly on reading the following description of various embodiments of the invention given as non-limiting examples.
REFERENCES:
patent: 3826260 (1974-07-01), Killinger
patent: 3826620 (1974-07-01), Killinger
patent: 3977555 (1976-08-01), Larson
patent: 4516967 (1985-05-01), Kopfer
patent: 4564054 (1986-01-01), Gustavsson
patent: 4768568 (1988-09-01), Fournier et al.
patent: 4976701 (1990-12-01), Ejlersen et al.
patent: 5125908 (1992-06-01), Cohen
Bouvier Bernard
Neftel Frederic
Debiotech S.A.
Nguyen Anhtuan T.
Wolf Greenfield & Sacks P.C.
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