Injection device

Details Injection device Injection device

1998-02-26

2000-07-11

Coggins, Wynn Wood

Surgery

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

Treating material introduced into or removed from body...

604207, A61M 500

Patent

active

060865679

DESCRIPTION:

BRIEF SUMMARY
BACKGROUND OF THE INVENTION

1. Field of the Invention
The invention relates to an injection device for injecting a selectable dose of a liquid substance from an ampoule located in an ampoule holder, comprising a sleeve-shaped mechanism holder mechanically coupled thereto, in the interior of the mechanism holder a longitudinally shiftable shaft with a piston disposed thereon being provided which acts on the ampoule, wherein the shaft being surrounded by an also longitudinally shiftable advancing sleeve, mechanically coupled thereto, which in its upper end area is closed by a lid.
2. Description of the Prior Art
An advancing facility for an injection device is known from EP 0 627 229 A1 by means of which a liquid substance from an ampoule can be administered. This advancing device consists of an outer sleeve, an inner sleeve protruding backward from the outer sleeve, and a toothed shaft movable by means of the inner sleeve against the force of a spring. The toothed shaft is provided with teeth, the length of which corresponds to a full injection dose. The inner sleeve is movable forward and backward by the value of the length of a full injection dose between two stops provided on the outer sleeve. The inner sleeve is provided with catching means which lock it in place upon reaching the front position at an opening of the carpoule sleeve, in an unlocking manner with respect to this. Finally, a recoil protection is intended for the toothed shaft.
The injection device provided with this advancing device cannot be employed once more after emptying the carpoule or ampoule.
Another injection device of this kind is known from EP 0 373 321 B1 which consists of an ampoule sleeve for receiving the ampoule and a delivering mechanism. In turn, this is composed of a cylindrical piston shaft with an inner hollow cylinder and an outer hollow cylinder which is formed in one piece with this and that exhibits a guiding cam on its outer shell. A dosing ring is fixed radially to the outer hollow cylinder. The dosing can be read off by means of a scaling fastened to the outer perimeter of the dosing ring through a sight glass set into the housing of the mechanism holder. The delivering mechanism is longitudinally movably arranged in the mechanism holder by means of a retaining spring and secured by a lid screwable into the housing of the mechanism holder. The dosing ring rests against the lid with the force of the retaining spring. The housing of the mechanism holder is provided on its inside with elongated slots of different length in which the corresponding guiding cam of the delivering mechanism is able to glide. As a result, the lift of the delivering mechanism is determined by the length of the elongated slot combining with the guiding cam. The adaptation to the needs of the patients of the dose to be administered exclusively takes place by an authorized person, e.g. a physician. A special-purpose tool is necessary, by means of which an interlocking ring of the device can be unlocked until the guiding cam of the delivering mechanism is released from the respective elongated slot. The physician is then able to select the desired dose by rotation of the released delivering mechanism and renewed catch of the guiding cam into a corresponding elongated slot.
Once selected, the dose cannot be varied without considerable effort. In addition, based on the construction of the delivering mechanism, the injection device can only be used for delivering a single dose although possibly a sufficient supply of medicine is still available in the ampoule. In order to administer another dose of medicine, the ampoule sleeve must be unlocked from the mechanism holder and disposed of together with the ampoule possibly still containing medicine.
An injection device of generic type is known from EP 0 037 696 B1 with which a dose of a liquid substance to be administered can be taken from an ampoule via a transmission mechanism of tractive force effective in one direction upon operating a locking cap. The transmission mechanism of tractive force co

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