Drug delivery device with plunger rod having nonuniform stopper interface
US12427264B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 26, 2020 |
| Grant date | Sep 30, 2025 |
| Priority date | — |
| Expiry date | Jan 28, 2043 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61M2005/31598
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
The present invention provides a drug delivery device (1) comprising: a drug reservoir (20) comprising a reservoir body (21) extending along a reference axis and an elastomeric stopper (30) arranged in the reservoir body (21), the elastomeric stopper (30) comprising a stopper body (31) extending between a front stopper end (32) and a rear stopper end (34) and having a plurality of axially spaced apart circumferential ribs (33) for sealing interaction with an interior wall (22) of the reservoir body (21), and a plunger rod structure (10) for displacing the elastomeric stopper (30) relative to the interior wall (22), the plunger rod structure (10) extending along the reference axis and comprising a distal end face (12, 14) adapted to interface with the rear stopper end (34). The distal end face (12, 14) comprises a first force transferring portion (14) and a second force transferring portion (12), the first force transferring portion (14) axially leading the second force transferring portion (12) and being adapted to interact with a peripheral portion of the rear stopper end (34).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.