Dosing mechanism for multi-shot injection device comprising flexible ratchet element
US11135376B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Mar 15, 2017 |
| Grant date | Oct 5, 2021 |
| Priority date | — |
| Expiry date | Jul 28, 2038 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61M5/31585
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
The disclosure provides a dose controlled multi-shot injection device comprising a housing and a dose setting mechanism, wherein the dose setting mechanism includes a drive spring, a rotatable dose setting handle adapted to set a dose of medicament, thereby biasing the drive spring, and a ratchet mechanism for maintaining the drive spring in a biased state against a spring force at a set dose. The ratchet mechanism includes a fixed ratchet element coupled to the housing and having a circumferential teething, a movable flexible ratchet element provided with at least two teethed portions configured to engage the circumferential teething at least pairwise at any one of a plurality of engaging positions, which respectively represent a set dose, and a rotational element coupled to the dose setting handle configured to translate torque from the dose setting handle into a number of forces radially acting on the flexible ratchet element resulting in an elastic deformation of the flexible ratchet element, thereby releasing the engagement between the teethed portion and the circumferential teething.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.