Seal structures for wet/dry automatic injectors
US7749190B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jan 26, 2007 |
| Grant date | Jul 6, 2010 |
| Priority date | — |
| Expiry date | Jun 22, 2027 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61M2205/7545
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
An automatic medicament injector having a compartment for a dry medicament component and a compartment for a wet medicament component. The two compartments are separated by a seal structure that converts from a sealing condition to a mixing condition when the device is activated. The seal structure includes a wiper that scrapes the interior walls in the dry component compartment to prevent the dry component from accumulating at the seal/glass interface. A tapered insert funnels the mixed medicament components to an attached needle assembly, but can be removed when the device is filled. A filter is provided between the medicament compartments and the needle assembly. A chamber between the filter and the needle allows for better flow through the filter. An actuation assembly drives the seal structure into the mixing condition and forces the mixed medicament through the needle and into the user.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.