Needleless injection device with pyrotechnic drive
US7160265B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Jun 20, 2001 |
| Grant date | Jan 9, 2007 |
| Priority date | — |
| Expiry date | Jan 29, 2023 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61M2005/3117
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
The invention relates to a needle-less injection device, comprising a cannula (5) which can be inserted in a housing (3), can be filled with a predetermined active substance (11) for injection, and comprises a piston (9) movable in a cannula housing for ejecting the active substance (11) from an outlet opening (53) in the cannula housing, and a propellant charge cartridge (7) insertable into the housing (3) and comprising a housing containing a propellant charge (19) and a device (23) for igniting the propellant charge, and a propelling surface (15) movable in a part (3a) of the housing of the injection device (1) or in the housing of the cannula (5) or in the cartridge housing and movable by the gas pressure, after ignition of the propellant charge (19), out of a starting position into an end position, the outer periphery of the propelling surface being sealed from the inner periphery of each housing during the entire displacement travel also, wherein the propelling surface (15) acts upon the piston (9) movable in the cannula housing.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.