Automatic injection device

Details Automatic injection device Automatic injection device

A - Human Necessities

61

M

128/85

A61M 5/20 (2006.01) A61M 5/24 (2006.01) A61M 5/31 (2006.01)

Patent

CA 1251706

ABSTRACT: The invention relates to an automatic injection device comprising an assembly of a discharge mechanism, a car- tridge holder of synthetic material and a cartridge which is slidably accomodated in the cartridge holder, which cartridge comprises a glass ampoule, if desired, enveloped by a sheath of shrinkable sheet, said ampoule consisting of an ampoule cylinder in which an injection liquid or various injection liquids separated from each other by stoppers and a piston which can be moved in the ampoule cylinder are provided, a connection means for an injection needle in which or to which the injection needle, if de- sired, covered by a guard to maintain the needle in a ste- rile condition, is connected, and a shoulder between am- poule cylinder and needle connection means, the cartridge holder consisting of a sleeve-like rear portion which is open at each end and which, after actuating the injection device, is traversed by the ampoule cylinder and the inner surface of which has substantially the same transverse dimensions over the whole length, and a front portion which forms one assembly with the sleeve-like portion and, after actuating the syringe, serves to discontinue the forward movement of the cartridge in the holder and to allow passage of the needle. The sleeve-like portion of the cartridge holder has a five-sided to fourteen-sided cross-section over a length which is at least equal to the length of the ampoule cylinder and is proportioned in such way that the ampoule cylinder engages the inner side sur- faces of said sleeve-like portion with friction. The in- vention furthermore relates to a cartridge holder for said injection device.

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