Device for dispensing discrete doses of a liquid

Details Device for dispensing discrete doses of a liquid Device for dispensing discrete doses of a liquid

1998-09-29

2000-05-02

McDermott, Corrine

Surgery

Means for introducing or removing material from body for...

Treating material introduced into or removed from body...

604135, 604157, 604231, A61M 500

Patent

active

060567287

DESCRIPTION:

BRIEF SUMMARY
BACKGROUND OF THE INVENTION

The invention is directed to a device for the output of a liquid in partitioned amounts out of a store region, preferably in the form of a cartridge, via an output mouth piece, preferably in the form of a attached injection needle.
Injection means of this sort are well known, disclosed for example, in the form of bar-shaped devices (U.S. Pat. No. 2,591,457) or in the form of inoculation pistols (U.S. Pat. No. 2,472,116). Such devices comprise a spring hammer, the strokes of which are controllable. This spring hammer is arranged in the back side of a charge chamber in which a conventionally shaped syringe can be installed. Depending on the stroke distance of the spring hammer that can be lockably adjusted in positions, the piston of the syringe is shifted in the direction of the output mouth piece. Such a gradual output finally leads to a total evacuation. The syringe is then generally thrown away.
The object of the invention is to provide a device of the above type that partitions, in a simple way, reproducible amounts coming out of a store region and to make them easily applicable.


SUMMARY OF THE INVENTION

This object is realised by the invention mentioned in the claims.
By such a development a device of the according type with a higher value of use is obtained. First of all this is achieved by a intermediate reservoir taking up the partitioned amount from the store room, whereby the intermediate reservoir comprises an output piston with a penetration canal to fill the intermediate reservoir. The amount to be drained is drawn from the back side of the piston to its front side and separated strictly from the remaining reserves. The inventive device no longer requires expenditure of great effort over the whole filling length, as was heretofore the case for known syringes. Accordingly, anologously functioning mechanical conditions are provided which can be adjusted in an optimum way to the parameters of an injection needle/liquid. Moreover this has the advantage that the reserve is held in readiness in a less expensive package. The syringe functioning in a certain way also as packing is surely too expensive to throw it away. It is furthermore advantageous if the output piston is movable, together with the receiver containing the store region, by filling the intermediate reservoir and when the output piston cylinder forming the intermediate reservoir is shiftable, together with this receiver, into the opposite direction. This produces on one hand a clear charging stroke in one direction and on the other hand an injection stroke into the opposite direction. In order to avoid a backwards movement when the output pressure is produced, an advantageous measure is taken that provides a stop valve between the store region and the intermediate reservoir. It is moreover advantageous that the shifting movement take place in the opposite direction and in successive phases. In this way an advancing stroke that brings the injection needle, and respectively the hollow needle, into a guiding position can be realized in addition to the injection stroke. The hollow needle projects out of a cover. The injection stroke occurs in an appropriate way only in the last moment, so that, before that the phases run constantly. The release is very abrupt and is based in both cases on a release of a spring being charged in a manner appropriately effecting the operation. Another advantage is that the cylinder continues in a sleeve surrounding the receiver. Both parts guide each other and they mutually provide stability, so that the device can be produced with thin walls. This leads to a reduction of the weight and permits in addition a relatively compact structural shape. The inventive device can literally be shaped with the dimensions of a cigarette package. With respect to another advantageous arrangement of the parts of the device, the invention proposes to arrange both springs at the upper end, i.e. meaning the end on the opposite side of the output mouth piece, of the sleeve/receiver and to be supporte

REFERENCES:
patent: 4755169 (1988-07-01), Sarnoff et al.
patent: 5092843 (1992-03-01), Monroe et al.
patent: 5298023 (1994-03-01), Haber et al.
patent: 5456672 (1995-10-01), Diederich et al.
patent: 5749968 (1998-05-01), Melanson et al.

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