Injection device

Details Injection device Injection device

A - Human Necessities

61

M

A61M 5/178 (2006.01) A61M 5/315 (2006.01)

Patent

CA 2082159

A device for injection from an injection cartridge (1) of a conventional type comprises a front sleeve (5), which holds the cartridge, a rear sleeve (10) which can be screwed .into the front sleeve (5), and a piston rod (16), which is connected to the piston (3) of the car- tridge and which can be actuated to expel an injectable preparation (4) from the cartridge (1). When the rear sleeve (10) is screwed into the front sleeve (5), indicia (18) at the rear end of the piston rod (16) will become visible through a window (15) arranged in a tubular extension (14) at the rear end of the rear sleeve (10), such that the dose to be injected is displayed. In each injection, the reading of the dose is zeroed automatically. Where the rear sleeve (10) is screwed into the front sleeve (5), there is arranged a pawl-and-ratchet mechanism, which prevents the unscrewing of the two sleeves from each other. 'rhe piston rod (16) is also provided with stopping means (19), which cooperate with :means (20) arranged inside the rear sleeve (10), to prevent that an excessive dose is set and administered.

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