Prefilled injection device with cleaning chamber
US11383041B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jan 19, 2018 |
| Grant date | Jul 12, 2022 |
| Priority date | — |
| Expiry date | Mar 8, 2039 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61M5/31565
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
The invention relates to an injection device comprising an End-of-Content mechanism. The End-of-Content mechanism comprises a piston rod (10) being driven forward by a rotatable piston rod guide (20), a driver (50) attached to a dose setting tube (30) and an End-of-Content tube (40). The End-of-Content tube is moved axially forward during dose setting a distance which correlates to the size of the dose being set. When the accumulated set and ejected dose equals the injectable amount initially available in the cartridge (3), the End-of-Content tube engages a lock mechanism provided in the piston rod guide and the driver engages a stop surface on the End-of-Content tube. Once the End-of-Content mechanism is locked, no further dose can be set and the piston rod guide cannot be rotated. In order to provide a proper engagement between the piston rod guide and the driver, the End-of-Content mechanism is released during dose expelling.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.