Pen shaped medication injection devices
US7771398B2 · kind B2 · utility
83Cited by
17References
45Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Dec 30, 2005 |
| Grant date | Aug 10, 2010 |
| Priority date | — |
| Expiry date | Jan 4, 2029 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61M2205/585
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
The present invention provides a delivery device comprising a fluid cartridge holder, housing and a piston drive mechanism that comprises a hollow piston rod and a drive-shaft. The hollow piston rod has an internal thread that mates with the external thread of the drive-shaft, forming a thread connection and being axially restrained in the proximal direction relative to the housing. The drive mechanism is in turn connected to the housing via a one way ratchet such that the piston rod is prevented from moving in the proximal direction.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.