Needle insertion-retraction system having dual torsion spring system
US11305056B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jul 14, 2018 |
| Grant date | Apr 19, 2022 |
| Priority date | — |
| Expiry date | Apr 14, 2039 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61M2005/14506
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
An insertion/retraction mechanism for a drug delivery device is disclosed. The insertion/retraction mechanism includes a retraction hub, an insertion hub, an insertion/retraction mechanism housing, and a dual torsion spring system. The retraction hub includes a first primary rotational stop and a second primary rotational stop extending radially inwardly from an inside surface. The insertion hub is disposed inside the retraction hub and comprises a first complementary rotational stop and a second complementary rotational stop extending radially outwardly from an outside surface. The dual torsion spring system causes the first primary rotational stop and the second primary rotational stop to selectively engage the first complementary rotational stop and the secondary rotational stop, respectively, and further causes the retraction hub to rotate relative to the insertion/retraction mechanism housing as the insertion/retraction mechanism moves between an initial position, an inserted position, and a retracted position.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.