Injection device

Details Injection device Injection device

A - Human Necessities

61

M

A61M 5/315 (2006.01) A61M 5/20 (2006.01) A61M 5/24 (2006.01) A61M 5/32 (2006.01)

Patent

CA 2359375

The invention relates to an injection device comprising a container (80) which receives a cartridge (52) which contains an injection fluid (53) and to whose proximal end an injection needle (76) can be fixed. The container (80) can be displaced in a housing (50, 48, 46, 36) between a proximal and a distal terminal position. A plunger (108) for expelling injection fluid (53) from the cartridge (52) is arranged in the housing and guided in a guide member (124) such that during injection it can be axially displaced but not rotated in relation to the housing. The plunger has an external thread (159) which is guided in an inner thread (152) of an adjustment member (151) serving to control the injection dose. Between the container (80) and the plunger (108) a frictional engagement coupling (162, 250) is provided for which in the manner of a slipping coupling serves to transmit at least part of an axial movement of the plunger (108) to the container (80).

L'invention concerne un appareil d'injection comprenant un contenant (80) servant à loger une cartouche (52) qui contient un liquide à injecter (53), une aiguille d'injection (76) pouvant être fixée à l'extrémité proximale de ladite cartouche. Ce contenant (80) peut coulisser dans un boîtier (50, 48, 46, 36) entre une position finale proximale et une position finale distale. Un piston (108) servant à faire sortir le liquide à injecter (53) de la cartouche (52), en le comprimant, est placé dans le boîtier. Ce piston peut coulisser axialement dans un organe de guidage (124) lors d'une injection, mais ne peut pas tourner par rapport au boîtier. Il présente un filetage extérieur (159) qui est guidé dans un filetage intérieur (152) d'un organe de réglage (151) servant à régler la dose à injecter. Un accouplement par liaison de force (162, 250) situé entre le contenant (80) et le piston (108) sert, à la manière d'un accouplement à friction, à transférer au moins une partie d'un mouvement axial du piston (108) au contenant (80).

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