Surgery – Means for introducing or removing material from body for... – Treating material introduced into or removed from body...
Patent
1989-07-28
1991-05-14
Yasko, John D.
Surgery
Means for introducing or removing material from body for...
Treating material introduced into or removed from body...
604184, 604191, 604231, A61M 528
Patent
active
050152297
DESCRIPTION:
BRIEF SUMMARY
The present invention concerns a device for the distribution of liquid products, particularly medical substances, comprising an elongated reservoir open at one end and a base closed at its opposite end, substantially cylindrical side walls and a narrowed neck, and containing at least one liquid to be mixed with another substance or to be distributed, for example by spraying, by application to the skin or eyes, or by injection; and a distribution means, movable with respect to this reservoir, this distribution means comprising at least one stopper means, this stopper means, also having a function of piston and valve, being partially engaged in the narrowed neck of the reservoir and being designed to close this reservoir when the device is in a first storage position and to liberate the liquid when the device is in a second activated position, also a capsule solid with this stopper means and mounted on the reservoir so that a protruding section of this reservoir, neighbouring its narrowed neck, is engaged in this capsule; this reservoir being surmounted by a barrel provided with inviolability units keeping it firmly attached to the capsule during storage.
Distributive devices of this type which are generally designed to be stored over a period of time which may be relatively long, already exist. To this end, the stopper means comprises a head of elastomer which is strongly compressed in the interior of the narrowed neck of the reservoir. This stopper means also comprises elastic retaining means which help to keep it in position and prevent any movement towards the interior of the reservoir. In addition the interior of this reservoir is subject to a slight positive pressure which also opposes a force tending to prevent the stopper means accidentally penetrating the interior of the reservoir during the entire storage period. It follows from this, that to bring the stopper means from the position it occupies in the storage position to the position it occupies when it is in the activated position, it is necessary to exert a certain force capable of overcoming these initial constraints. If this force is exerted without control or restraint, a part of the liquid initially contained in the reservoir risks being ejected and lost. Given that the volume of liquid contained in the reservoir is accurately proportioned, it is essential, especially when a medicine is involved, for example a medicine to be injected, that a part of this liquid should not be lost during the manipulations described above.
The present invention proposes solving this problem by providing, in particular, means of allowing the precise control of the transformation of the device from its storage position to its activated position.
To this end, the device is characterised in that the barrel is provided with a plunger which is designed to push against at least one part of the closed base of the reservoir and/or against its side walls, and which is designed to push the reservoir in such a way that the stopper means enters the neck and the device passes from its storage position to its activated position, this plunger being a piece moving axially with respect to said barrel.
According to a preferred embodiment of the device, the distribution means is the needle of a syringe and the liquid to be distributed is an injectable medicine.
According to another preferred embodiment of the invention, the distribution means is an applicator for the skin, the eyes or of a spray, and the liquid is a substance to be applied to the skin, the eyes or by spraying.
To enable the path of the plunger to be limited and, from this ensure a precise control of the movement of the reservoir to transform the device from its storage position to its activated position, the barrel is preferably fitted with at least one stop.
For certain applications, the quantity of liquid contained in the reservoir no longer corresponds to a single dose but to a volume which may correspond to several multiples of a single dose. In this case the barrel would preferably bear two stops designed to
REFERENCES:
patent: 4741737 (1988-05-01), Meyer et al.
patent: 4772271 (1988-10-01), Meyer et al
patent: 4820286 (1989-04-01), Van der Wal
Howald Ernst
Meyer Gabriel
Gutowski Anthony
Medicorp Holding S.A.
Yasko John D.
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