Plunger sub-assembly for a prefilled medicament injector, a prefilled medicament injector and method for assembling a prefilled medical injector
US11628256B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 29, 2017 |
| Grant date | Apr 18, 2023 |
| Priority date | — |
| Expiry date | Aug 15, 2040 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61M2005/3154
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
A plunger sub-assembly (40, 60, 70; 80) for a pre-filled medicament injector for expelling a dose of a medicament, comprising: a) a container (60) holding a medicament, the container (60) comprising a body (61) with a proximally facing rim surface (64), and a distally slideable piston (63); b) a plunger (40); and c) a tolerance compensating element (70; 80) configured to cooperate with the plunger (40) and to cooperate with either the proximally facing rim surface (64) or the piston (63), the tolerance compensating element (70; 80) being rotatable relative to the plunger (40) to adjust the piston (63) end of dose position. The plunger sub-assembly (40, 60, 70; 80) is formed so that end of dose state occurs by the plunger (40) cooperating with the proximally facing rim surface (64). Pre-filled medicament injectors and methods of assembling a pre-filled medicament injector are further described.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.