Drive mechanism for an injection device

Details Drive mechanism for an injection device Drive mechanism for an injection device

2006-03-07

2006-03-07

Hayes, Michael J. (Department: 3763)

Surgery

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

Treating material introduced into or removed from body...

C604S218000, C604S232000

Reexamination Certificate

active

07008405

ABSTRACT:
Injection devices are known for the self administration of medicament by patients. The medicament is typically contained within a cartridge located within the injection device. It is a problem that injection devices should be small enough to fit into a jacket pocket or a hand bag without difficulty. Also, the injection device must be of a size that enables a piston or similar used to drive the 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bung within the cartridge to be moved both to a maximum dispense position within the cartridge and to be fully withdrawn from the cartridge to allow for replacement of the cartridge.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 injecting device is disclosed in which the drive mechanism comprises a displaceable dosing spindle6, a dial dose means8, a transmission means10, and a cable means12, a piston comprising a plurality of nested piston members30, 32, 34, displacement of the transmission means10causing the cable means12to move at least one of one of the nested piston members to drive a cartridge bung18.

REFERENCES:
patent: 4659327 (1987-04-01), Bennett et al.
patent: 5032117 (1991-07-01), Motta
patent: 5858000 (1999-01-01), Novacek et al.
patent: 5957896 (1999-09-01), Bendek et al.
patent: 6004297 (1999-12-01), Steenfeldt-Jensen et al.
patent: 6613019 (2003-09-01), Munk
patent: 2002/0107487 (2002-08-01), Preuthun
patent: WO 94/03222 (1994-02-01), None

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