Surgery – Means for introducing or removing material from body for... – Treating material introduced into or removed from body...
Patent
1998-08-06
2000-01-11
Yasko, John D.
Surgery
Means for introducing or removing material from body for...
Treating material introduced into or removed from body...
604228, A61M 500
Patent
active
060130563
DESCRIPTION:
BRIEF SUMMARY
The present application relates to a self-destructing hypodermic syringe comprising an optionally graduated barrel having a Luer lock-tip in one end and a plunger head with plunger rod, of the type having a breaking element incorporated in connection with the plunger or plunger rod, where the breaking element is broken when the syringe is used for the first time.
To be more precise, the invention relates to a syringe wherein there is incorporated a breaking element of this kind which in principle is broken the instant the syringe is put into use.
The principle of the present invention could conceivably be used in several areas, but it is primarily relevant and especially useful in connection with disposable syringes, and the invention and its practical embodiments will therefore be illustrated with the aid of disposable syringes.
Today, such syringes are used extensively by doctors, in hospitals and other health institutions, and also by diabetics or others who need regular injections and who inject themselves. In addition however, syringes are unfortunately used extensively and repeatedly by "mainliners", addicts who take drugs by injection.
Major problems have arisen in connection with the last-mentioned category of users, namely the reuse of syringes, even conventional disposable syringes.
Recently there has been an alarming spread of diseases transmitted by blood because drug addicts lend each other their syringes. Of these infectious diseases special mention can be made of hepatitis B and AIDS.
Self-destructing hypodermic syringes having a breaking member which is broken after the syringe has been used for the first time are known. However, it has been found that the majority of solutions that hitherto have been proposed have either been too expensive to manufacture or have been unsafe to use since it has been possible to manipulate the syringe so that it could be reused.
From the prior art, particular reference will be made to NO 163263 which describes a self-destructing hypodermic syringe of the disposable type, generally of the type described above, wherein the breaking element consists of an element having at least one cam follower which interacts with a cam or a link, extending obliquely relative to the syringe axis, in a second member, which cam or link at its end is connected to an axially extending cam or link that is open towards one end of the member, that a stopper is provided for the cam follower at the end of the cam opposite the connection to the link, and that on the plunger rod or between this and the plunger there is provided a freely rotating member.
The objective of the present invention is to improve the known art and therefore to provide a self-destructing hypodermic syringe of the disposable kind which is both inexpensive to make and safe to use, i.e., that after the first and only use it can no longer be used.
The invention therefore relates to a self-destructing hypodermic syringe of the type mentioned above, and this syringe is characterised by the features set forth in the characterising clause of the main claim.
The mode of operation and the construction of the syringe according to the invention are based on a study of the steps taken today when giving intravenous and intramuscular injections, these steps being laid down by the health authorities and reinforced in the training of health personnel to increase safety in otherwise routine operations.
In principle, the steps of an injection can be summarised as given below, on the basis of a syringe barrel having a needle attached thereto and a plunger, where the plunger rod is inserted halfway: is drawn back to aspirate the desired volume; the plunger is introduced into the barrel to express any last remaining air, whereupon the needle is inserted into a muscle or blood vessel; a little; bottom; medicament residue, dismantling, or with the type of syringe discussed here, final destruction of the syringe.
The syringe according to the present invention is, as indicated above, constructed with this work cycle in mind and its mode
REFERENCES:
patent: 4775363 (1988-10-01), Sandsdalen
patent: 4908020 (1990-03-01), Pettersen
patent: 5181912 (1993-01-01), Hammett
patent: 5643211 (1997-07-01), Sadowski et al.
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