NEEDLE-FREE INJECTION DEVICE WITH A MEMBRANE HAVING AN IMPROVED TIGHTNESS Russian patent published in 2020 - IPC A61M5/20 A61M5/30 

FIELD: medical equipment.

SUBSTANCE: invention relates to a needle-free injection device (10). Proposed device comprises housing (12) to make chamber (44) confined by tubular wall (46) extending axially from top radial seat (48) and gas generator (16). Device has tubular reservoir (24) containing active substance (26) passing in axial direction in above chamber (44) from the upper end forming upper rim (40) to lower end (36). Device has elastically deformable T-shaped membrane (50), which comprises radial annular disc (52), placed in axial direction between upper rim (40) of reservoir (24) and said seat (48) formed by housing (12). Membrane comprises tubular part (54) passing in axial direction from annular disc (52) and entering reservoir (24). Device has injection nozzle (38) for injection of active substance (26) located at lower end of reservoir (24). Device comprises annular gasket (64) arranged in axial direction between annular disc (52) of membrane (50) and upper rim (40) of reservoir (24) and extending in radial direction to tubular wall (46) of chamber (44) of housing (12), to reduce axial deformation of membrane disc (52) between reservoir (24) and tubular wall (46) of said chamber (44) in axial compression of disk (52) of membrane (50).

EFFECT: technical result is prevention of disc deformation, which is capable to break tightness between membrane and housing of device, which will lead to leaks.

7 cl, 4 dwg