Patent ID: 6508788
Filing Date: 2003-01-21
Classification: A61M

Abstract:
A medication delivery device for delivering medicine or other fluent material to a mammal body, having a housing (1) accommodating a cartridge (2) containing an amount of said medicine, comprising:an elastomeric piston (3) movable mounted in said cartridge (2), which elastomeric piston (3) is moved from a proximal end of said cartridge (2) towards a distal end of said cartridge (2) by rotating at least a part (5) of a first telescopic piston rod (4), which first telescopic piston rod (4) has a distal part (7) abutting said elastomeric piston (3) and a proximal part (5) rotatably mounted in said housing (1) and a plurality of parts (6) there between, said parts (5,6,7) being connected to each other by mating threads, drive means (8,9,10,11 ) for rotating said first telescopic piston rod (4), such that said elastomeric piston (3) moves forward inside said cartridge (2) and expels an amount of said medicine, and means preventing said elastomeric piston (3) from rotating when said part (5) of said first telescopic piston rod (4) is rotated, characterized in that said means preventing said elastomeric piston (3) from rotating when at least a part (5) of said first telescopic piston rod (4) is rotated comprises an additional telescopic piston rod (14) having a proximal end mounted in said housing (1) and a distal end abutting said elastomeric piston (3).