Drive mechanism for a drug delivery device
US10549046B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 3, 2014 |
| Grant date | Feb 4, 2020 |
| Priority date | — |
| Expiry date | Mar 30, 2036 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61M2205/582
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
A drive mechanism (1) for use in a drug delivery device (100) is provided. The drive mechanism (1) comprises a housing (10, 11, 12, 14, 15) with a proximal and a distal end and a piston rod (22) which is rotatable with respect to the housing (10, 11, 12, 14, 15). The drive mechanism (1) further comprises a nut member (31) which is selectively rotationally lockable with respect to the housing (10, 11, 12, 14, 15), wherein the drive mechanism (1) is switchable between a setting mode of operation and a dispensing mode of operation. The drive mechanism (1) is configured such that in the setting mode of operation, the nut member (31) and the piston rod (22) are rotatable with respect to the housing (10, 11, 12, 14, 15), and in the dispensing mode of operation, the piston rod (22) is rotatable with respect to the housing (10, 11, 12, 14, 15) and the nut member (31) is rotationally locked with respect to the housing (10, 11, 12, 14, 15), wherein, when the piston rod (22) rotates, the piston rod (22) moves distally with respect to the nut member (31).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.