Drive mechanism for an injection device
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United States of America Patent
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Apr 20, 2010
Issued Date -
N/A
app pub date -
Dec 21, 2001
filing date -
Dec 22, 2000
priority date (Note) -
In Force
status (Latency Note)
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Abstract
A drive mechanism for an injection device is disclosed in which piston means are selectively driven to expel medicament from within a medicament cartridge. The drive mechanism comprises a drive means associated with a first ratchet member, a second ratchet member associated with the piston means, a housing, the first ratchet member and the second ratchet member being disposed within the housing. The second ratchet member being biased by biasing means toward the first ratchet member. The drive means is actuable reciprocally to drive the first ratchet member in a first angular direction such that the first ratchet member drives the second ratchet member along its longitudinal axis against the biasing means along at least a part of its movement and subsequently drives the first ratchet member and the second ratchet member together in a second angular direction thereby to drive the piston means.
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