Automatic injection device with delay mechanism including dual functioning biasing member
US8734394B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Feb 24, 2011 |
| Grant date | May 27, 2014 |
| Priority date | — |
| Expiry date | Feb 24, 2031 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61M2205/583
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
An automatic injection apparatus including a delay mechanism for properly delivering medication prior to the needled syringe of the apparatus being retracted. In one form, the delay mechanism includes a shuttle (170) for the syringe, a follower (250), a locking member, a damping compound between the follower and a supporting surface (308) to dampen rotation of the follower relative to the shuttle, and a dual functioning biasing member (290) acting between the shuttle and the follower. When the locking member moves to a release position during an injection, the dual functioning biasing member first provides a torsional force to force the follower to rotate relative to the shuttle from a latching position to an unlatching position, and then the dual functioning biasing member provides an axial force to force the shuttle axially relative to the follower to move the shuttle for retracting the syringe needle into the housing of the apparatus after injection.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.