Administration device comprising a plunger rod with a return lock
US7470260B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jan 13, 2005 |
| Grant date | Dec 30, 2008 |
| Priority date | — |
| Expiry date | Jan 13, 2025 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61M5/502
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
An administering apparatus including a casing, a reservoir, a piston accommodated in the reservoir such that it can be shifted in an advancing direction, a piston rod which acts on the piston in the advancing direction and forms a first locking mechanism, a second locking mechanism which cannot be moved counter to the advancing direction, a lock element row formed by successively arranged first locking elements, extending in the advancing direction, and formed by one of the locking mechanisms, and a second lock element formed by the other locking mechanism and engaged with the lock element row, wherein it engages with a lock element gap of the lock element row, wherein the second lock element is moved out of engagement by a movement, against an elasticity force, of the piston rod in the advancing direction, but, when engaged, counteracts a movement of the piston rod counter to the advancing direction with a resistance force greater than the elasticity force to prevent the piston rod from moving counter to the advancing direction. In some embodiments, either or both the first and second locking mechanisms form a securing element at one or both ends with respect to the advancing dire…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.