Surgery – Means for introducing or removing material from body for... – Treating material introduced into or removed from body...
Patent
1987-04-07
1988-09-20
Yasko, John D.
Surgery
Means for introducing or removing material from body for...
Treating material introduced into or removed from body...
604200, A61M 518
Patent
active
047722711
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to a prefilled syringe comprising an elongated reservoir open at one of its ends, containing a liquid, particularly liquid medicine to be injected, and an injection element movable with respect to this reservoir, this injection element comprising a blocking element at least partially engaged in the reservoir at its open end, and adapted to block the reservoir when the syringe is in a first position called a storage position and to assure the evacuation of the liquid when a syringe is in a second position called the injection position, as well as a capsule integral with this blocking element and mounted on the reservoir such that an end slice of this reservoir, adjacent to its opening, is engaged in this capsule.
Prefilled syringes of this type are adapted to be able to be stored during a period which can be relatively long. To this end, the blocking element comprises an elastomeric head which is strongly compressed within the neck of the reservoir. This blocking element further comprises elastic retention elements which have a tendency to retain it in its position and to prevent any displacement towards the interior of the reservoir. Finally, within this reservoir there exists an excess pressure which likewise opposes a force tending to prevent the penetration of the blocking element to the interior of the reservoir during the entire storage phase.
Consequently to bring the blocking element from its storage position in which it blocks in a sealed fashion the open end of the reservoir, towards its injection position in which it fills the double role of piston and valve to allow for the evacuation of the liquid medicine from the reservoir, it is necessary to exert a certain force adapted to overcome the initial inertia. If this force is exerted without control or restraint, a portion of the liquid contained in the reservoir may be ejected and lost. Being given that the volume of liquid medicine contained in the reservoir can correspond to a single dose, it is essential that this dose be injected in its entirety and that the loss of medication due to the phenomenon mentioned above be avoided, particularly when it is a question of doses of small volume.
The present invention proposes overcoming this problem by providing means making it possible to control in a precise fashion the passage of the syringe from its storage position to its injection position, and in particular to void the syringe of bubbles to render it absolutely ready for use.
To this end, the prefilled syringe according to the invention is characterized in that it is equipped with a cap fitted on top of the closed end of the elongated reservoir, and in that this cap is provided with removable linkage means to render this cap integral with the capsule, when the syringe is in its first position, and support means to allow for a relative limited displacement of the movable injection element and of the reservoir to bring the prefilled syringe from its first position into its second position.
According to a preferred embodiment, the said removable linkage means comprise a base fixed to the capsule, this base being connected to the cap by a zone of lesser resistance.
The said base is preferably attached to an annular edge provided around the capsule adjacent to its end in which is engaged the open end of the reservoir.
The said annular edge provided around the capsule preferably forms two lateral maintenance wings of the syringe.
The said base is preferably welded by ultrasound to the annular edge.
The said support means preferably comprise at least one abutment adapted to cooperate with an edge of the cap and the distance between this abutment and this edge is preferably substantially equal to the said relative limited displacement of the movable injection element and of the reservoir. As a result, when these two elements are effectively displaced with respect to one another by this distance separating the abutment from the edge, the syringe is voided of air bubbles, i.e., brought into its use position.
According to a pr
REFERENCES:
patent: 2453590 (1948-11-01), Poux
patent: 3892237 (1975-07-01), Steiner
patent: 3943927 (1976-03-01), Norgren
patent: 4091812 (1978-05-01), Helixon et al.
patent: 4227528 (1980-10-01), Wardlaw
Howald Ernst
Meyer Gabriel
Medicorp Holding S.A.
Yasko John D.
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