Surgery – Means for introducing or removing material from body for... – Treating material introduced into or removed from body...
Patent
1996-08-01
1998-07-14
Rimell, Sam
Surgery
Means for introducing or removing material from body for...
Treating material introduced into or removed from body...
604135, 604131, A61M 520
Patent
active
057796777
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention relates to an automatic drug injector. Such an injector allows a liquid drug to be introduced into a patient's body through his skin. To do this, a hollow needle pierces the patient's skin, penetrates to a defined depth inside the patient's body, then, with the aid of a plunger, the liquid drug is injected, from an ampoule or from the body of a syringe, through the needle and into the patient's body.
With injectors of this kind, a person who is not accustomed to performing injections may nevertheless do so. For this, it suffices to place the injector on the patient's skin and to trigger the mechanism. It is even possible to inject oneself with a drug, without the intervention of a doctor or a nurse. Thus, it is no longer necessary to prolong the hospitalization of an individual for the sole reason that this individual has to take injections of drugs several times a day.
It is preferable that the person who receives the drug should not see the needle, especially if he is giving himself the injection. It is thus easier for him to overcome his fear of the pricking.
For reasons of safety, it is preferable for the needle to be protected following the injection. It is possible simply to protect it with a cap, or else to retract it from the injector and place it in a rigid case. However, it is advantageous that the needle retract automatically, without manual intervention, in order to achieve maximum safety. Indeed, if the patient is a virus carrier, there is a high risk of the needle being contaminated following the injection, and if someone injures himself with this needle, the disease (AIDS, hepatitis B, etc.) carried by the virus may be transmitted.
The document WO 92/20388 discloses an automatic injector of this type in which the needle does not retract automatically at the end of the injection. There is therefore a risk of contamination with such an injector once it has been used.
A syringe is also known, from the document WO 92/18187, in which the needle retracts automatically in the plunger rod when the plunger has arrived at the end of its stroke. This syringe can be used only once. Moreover, only the retraction of the needle is automatic. The pricking and the injection are effected manually.
Patent FR 2 342 079 for its part discloses an injector in which the three operations--pricking, injection, retraction--are effected automatically. The disadvantage of this device is that it is necessary, on the one hand, to release a first spring in order to activate the pricking and the injection, and, on the other hand, when these two operations have been effected, to activate the retraction of the needle by releasing another spring. Once the injection has been carried out, it is possible to retract the needle from the patient's body without activating the retraction of the needle to inside the body of the injector. The needle may therefore find itself unprotected following the injection, and there is therefore a risk of contamination.
SUMMARY OF THE INVENTION
This injector comprises in particular a cylindrical body in which the body of a syringe slides axially, and also three springs. One spring activates the introduction of the needle into the patient's body, another the injection of the drug, and the third the retraction of the syringe, with the needle, into the cylindrical body.
The object of the invention is to propose a device which is capable of injecting one or more doses of drug, is very simple to manipulate, and allows an operator who does not know how to perform injections to inject a drug dose, optionally into himself, while preventing any risk of accidental pricking following the use of the device. Another object is to make available an injector which is simple to produce and has a fairly low cost price.
To this end, the injector which the invention proposes is an automatic injector for a drug in liquid form, comprising: injected and comprising a tubular wall in the axis of the body, a plunger forming a seal, closing one end of the said tubular wall, and d
REFERENCES:
patent: 4258713 (1981-03-01), Wardlaw
patent: 4661098 (1987-04-01), Bekkering
patent: 4676781 (1987-06-01), Phillips
patent: 4717383 (1988-01-01), Phillips
patent: 5114406 (1992-05-01), Gabriel
patent: 5137516 (1992-08-01), Rand et al.
patent: 5176643 (1993-01-01), Kramer
patent: 5300030 (1994-04-01), Crossman
patent: 5358489 (1994-10-01), Wyrick
Laboratoire Aguettant
Rimell Sam
Yeh Luke J.
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