EP0554996A1 — Medication delivery pen with improved dosage setting
Assigned to Becton Dickinson and Co · Expires 1993-08-11 · 33y expired
What this patent protects
An injection device (10) is provided for injecting fluids such as insulin within body tissue. The device includes a housing (20), a piston rod movably mounted within the housing, and a dose setting mechanism for controlling the movement of the piston rod with respect to a fluid c…
USPTO Abstract
An injection device (10) is provided for injecting fluids such as insulin within body tissue. The device includes a housing (20), a piston rod movably mounted within the housing, and a dose setting mechanism for controlling the movement of the piston rod with respect to a fluid containing cartridge removably positioned within the housing. The dose setting mechanism includes a units counter ring (36) and a tens counter ring (38). A transmission key (44) is provided for selectively coupling the units and tens counter rings so that they rotate together only during selected portions of the dose setting procedure. The piston rod includes a plunger (22) and a lead screw (26) slidably positioned within the plunger. The plunger and lead screw are coupled by a pair of half nuts (28). The half nuts may be uncoupled from the lead screw in order to allow it to slide freely with respect to the plunger. A new cartridge (46) may accordingly be installed quickly and easily as the lead screw is easily displaced by a new cartridge.
Drugs covered by this patent
- Ozempic (semaglutide) · Novo Nordisk
Bibliographic data sourced from FDA Orange Book + USPTO public records. Plain-English summary generated by AI grounded in source text. Patent term extensions (PTR, SPC, pediatric) may shift the effective expiry. Not legal advice.
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