Surgery – Means for introducing or removing material from body for... – Treating material introduced into or removed from body...
Patent
1995-07-20
1997-10-28
Rimell, Sam
Surgery
Means for introducing or removing material from body for...
Treating material introduced into or removed from body...
604156, 604162, 604198, A61M 532, A61M 520
Patent
active
056812914
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to an auto-injector for prefilled syringes incorporating a first device which makes automatic the needle penetration into the user's body and controls a second device which performs the medicament injection with the result of having the medicament injection beginning only after the complete needle penetration thereby avoiding any medicament delivery at a non-desired depth or site.
A further object of the invention is to provide an effective and automatic protection of the needle after the injection, avoiding any risk of accidental needlestick injury.
A third object of the present invention is to provide an automatic disposable device for prefilled syringes just intended to aid, by making it automatic, the needle introduction into the patient's body and requiring the manual injection of the medicament by means of operating as usual the syringe piston.
In the pharmaceutical field, in order to facilitate certain medicament delivery by means of intramuscular or subcutaneous injections, specific automatic devices or auto-injectors have been developed.
These devices, available either as disposable or reusable versions, usually contain a syringe filled with the medicament and thanks to the action of a stressed spring which is snap released in response to determined actuating procedures they cause the forward movement of the syringe, and therefore the needle penetration into the patient's or user's body, and, at the same time, the medicament injection. Such a device is disclosed in WO 92/19296.
One of the main problems showed by these devices is caused by this commonly used working principle.
In fact the stressed spring, when released, directly transmits its thrust against the piston of the syringe and as the forward movement of the latter, and therefore the needle penetration, offers a lower resistance than the one offered by the piston movement into the syringe to cause the liquid expulsion, the two actions occurs in a sequence.
However, in practice, the thrust exerted by the spring on the syringe piston causes a certain medicament outlet from the needle since the beginning of the thrust and therefore when the needle is not yet penetrated or has not reached the desired depth.
This situation could cause, in the use of certain medicaments, like calciheparine, whose depth of delivery is particularly important, undesired effects and in particular persistent and large haematomas.
Another problem often existing in the use of these devices depends from the need to cover the needle with a protective cap after the injection. This causes the risk of accidental needlestick injuries while placing the cap or the possibility that, through negligence, the auto-injector is discarded without a needle protection in case the cap is not replaced.
In both cases the risk of contracting an infection is evidently high.
Further problems generally related to the existing auto-injectors depend from difficulty of use, high costs or the possibility of actuation when the device is not correctly placed against the user's or the patient's body.
For this reasons, it has appeared of interest the development of a disposable instrument, or auto-injector, of great simplicity and low cost incorporating a first device able to perform the automatic and painless needle penetration into the user's body combined with a second device, controlled by the first one and actuated only when the needle penetration has been completed, which performs the medicament injection, thus eleminating any possibility of medicament delivery at an undesired depth or site.
According to the invention, there is provided an auto-injector for a medicament prefilled syringe, having a head at one end and fitted with a needle at the other end, said auto-injector incorporating a first device which makes automatic the needle penetration into the user's body and controls a second device which performs the medicament injection, said injection being controlled by a second trigger means, said first device comprising a sliding tubular element or slider concent
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Racunas Robert V.
Rimell Sam
Tebro S.A.
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