Injection device
US4883472A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jul 31, 1987 |
| Grant date | Nov 28, 1989 |
| Priority date | — |
| Expiry date | Jul 31, 2007 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61M2005/2488
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
An exchangeable prefilled syringe (4) is arranged in the front part (2) of the device. In the rear part (1), a gear mechanism (3) is arranged, the drive member of which is a driving sleeve (10) provided with a manipulating head (11), and the driven member of which is a threaded rod (12) mounted non-rotationally but longitudinally displaceably in the driving sleeve. The threaded rod (12) is seated in the female thread (22) of a gear element (20) which can be advanced, by exerting pressure on the manipulating head (11) in the axial longitudinal direction from a rest position into an end position against the force of a spring (26). In the rest position of the gear element (20), the threaded rod (12), located at a distance from the plunger (5) of the prefilled syringe (4), is threaded, by rotating the manipulating head (11), through the female thread (22) of the gear element (20) in correspondence with a plunger path required for the amount of liquid to be respectively injected, without the threaded rod (12) abutting against the plunger (5) during this step. Thereafter, the needle (7) is inserted, and the gear element (20) is advanced, by exerting pressure on the manipulating head (11)…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.