Surgery – Means for introducing or removing material from body for... – Treating material introduced into or removed from body...
Patent
1994-11-10
1996-06-18
Yasko, John D.
Surgery
Means for introducing or removing material from body for...
Treating material introduced into or removed from body...
604195, A61M 500
Patent
active
055272851
DESCRIPTION:
BRIEF SUMMARY
This application is a 371 of PCT/SE93/00423 filed May 14, 1993.
The present invention generally relates to a disposable injection syringe, and the invention is more particularly concerned with such a syringe which is designed such that it is made unusable for re-use after it has been used one single time, and which, in addition thereto, makes it possible to hide the injection needle tip for preventing said injection needle tip from coming into contact with any object. The invention also covers both pre-filled syringes and syringes which can filled and can be used for injection purposes--only once.
By a disposable syringe is meant, in this connection, both a prefilled syringe which can not be refilled, and a syringe which can be filled only once and can, in connection thereto, be used only once for injection purposes, and also a syringe which makes it possible to take blood samples or other types of laboratory samples only once and, in connection thereto, to expel said sample from the syringe.
The disposable syringes which are on the market to-day are mainly simple and cheap plastic copies of conventional syringes, and said known syringes are often being reused, in particular in the third world. It is also common that one and the same syringe is used by several persons within addict circles in that the syringe is lent to other persons, whereby infections are easily being transmitted from sick people to healthy people.
A few attempts have been made to provide disposable syringes which do not allow a refilling thereof. One such solution is built on the principle that the syringe piston becomes locked up in its inner position after the injection has been made, so that the syringe can not be refilled. Another solution is built on the principle that a body containing the injection medium is being deformed at the end stage of a first injection so that, also in this case, the syringe can not be refilled. Still another solution is built on the principle that the syringe piston, or any part of the syringe connected to the syringe piston, becomes broken apart, or is otherwise damaged, at the final stage of the injection process so that the connection between the piston and the active part of the piston rod is broken, whereby the syringe, also in this case, can not be refilled.
A problem with said suggested self-distroying prefill syringes and disposable syringes is that they do not allow different types of injection, and another problem is that they are formed so that the injection needle or cannula is left on the syringe after the injection. As a concequence the injection needle can be removed from the syringe and can be re-used as many times as desired thereby involving a risque of transmitting infections.
It also often happens that persons hurt themselves by stepping on injection needles which have been thrown away in the nature. Also in the medical care field accidents occur during handling of injection needles. Therefore, a further object of the invention is to suggest a prefill syringe or a disposable syringe of a type which is designed so that the injection needle or cannula is eliminated after one sole possible injection process.
Further, it is noted that injection medium bottles generally stand under a certain sub-pressure, and when filling a syringe from such a bottle it is necessary to press a slight amount of air into the bottle since it may otherwise be difficult to draw or suck the injection medium into the syringe. Therefore, a disposable syringe according to the invention preferably also should be formed so that the piston can be expelled a slight distance in connection to drawing or sucking the injection medium into the syringe.
In case of intravenous injection is is also necessary that the syringe piston can be pulled back a slight distance, whereby a slight amount of blood is being drawn into the syringe, whereby it can be checked that the injection needle has full blood contant, and this is visually confirmed by the fact that a slight amount of blood is being drawn into the syringe. Therefore a di
REFERENCES:
patent: 4915700 (1990-04-01), Noonan, Jr.
patent: 5183466 (1993-02-01), Movern
patent: 5221262 (1993-06-01), Kite
patent: 5250030 (1993-10-01), Corsich
Lenz Thomas
Smit Karlo
Funova AB
Yasko John D.
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