EP0338806A2 — Syringes
Assigned to Owen Mumford Ltd · Expires 1989-10-25 · 37y expired
What this patent protects
A generally pen-like syringe incorporates a dose metering device provided by a cap (7) rotatable with respect to a pen body (8) to a position related to the dose of medicament (for example insulin) to be injected. The rotation compresses a coil spring (6), which is prevented from…
USPTO Abstract
A generally pen-like syringe incorporates a dose metering device provided by a cap (7) rotatable with respect to a pen body (8) to a position related to the dose of medicament (for example insulin) to be injected. The rotation compresses a coil spring (6), which is prevented from unwinding by co-operating ratchet teeth. When the dose is to be injected, a trigger slide (42) is moved to the left causing the ratchet teeth to come out of engagement. This permits the spring (6) to unwind, thereby rotating a drive sleeve (1), drive gear (3) and a drive plunger (2). The drive plunger (2) is formed with a quick pitch screw thread so that its rotational movement is accompanied by axial movement to cause medicament to be discharged from a cartridge and injected through a needle.
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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