Relating in and relating to an injection device

Details Relating in and relating to an injection device Relating in and relating to an injection device

2011-07-26

2011-07-26

Desanto, Matthew F (Department: 3763)

Surgery

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

Treating material introduced into or removed from body...

Reexamination Certificate

active

07985201

ABSTRACT:
Injection devices are known for the self administration of a medicament by patients in which the medicament is contained within a cartridge located within the injection device. It is a problem that such injection devices should be small enough to fit into a jacket pocket or a hand bag without difficulty. Concurrently, the injection device must be of size that enables a piston or similar used to drive a cartridge bung within the cartridge to be moved both to a maximum dispense position within the cartridge and to be fully withdrawn from the cartridge to allow for replacement of the cartridge. A drive mechanism for an injection device is disclosed comprising a piston member10, a semi rigid belt18connected to the piston member10, a belt drive means to selectively engage with the semi rigid belt18to drive the semi rigid belt18, and a dose setting mechanism to control the selective engagement of the semi rigid belt in which the semi rigid belt18includes a track incorporated therein and the belt drive means comprises a tooth50for selective engagement with the track to drive the belt18only when there is relative movement between the semi rigid belt18and the tooth50in a first direction. An injection device comprising such a drive mechanism is also disclosed.

REFERENCES:
patent: 5637095 (1997-06-01), Nason et al.
patent: 6110149 (2000-08-01), Klitgaard et al.
patent: 6537251 (2003-03-01), Klitmose
patent: 6796970 (2004-09-01), Klitmose et al.
patent: WO 98/57688 (1998-12-01), None
patent: WO 01/78812 (2001-10-01), None

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