Process and autoinjector device for injections with increased patient comfort
US11052195B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jul 6, 2016 |
| Grant date | Jul 6, 2021 |
| Priority date | — |
| Expiry date | Feb 22, 2038 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61M2005/2073
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
The invention provides methods and apparatus for injecting a medicine, especially a highly viscous medicine. Conventional methods and apparatus for injecting viscous medicines suffer from a variety of problems such as excessive force during the initial needle insertion and initial injection. In an inventive method, during the initial phase of the injection, energy is stored in a torsion spring that is subsequently released during a later stage of the injection. The present invention also provides for an improved autoinjector; especially via the use of a combination compression and torsion spring that powers the injection through controlling force applied to a plunger via a screw flange or nut having pins that ride in a prescribed path down the length of the autoinjector.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.