Injection apparatus

A - Human Necessities – 61 – M

Patent

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Details

A61M 5/315 (2006.01)

Patent

CA 2519364

An injection apparatus comprises a barrel (50) that is implemented to receive a container (108) with injection fluid (110). It further comprises a piston rod (98), provided with a thread (100), for expelling injection fluid (110) from such a container (108), which piston rod (98) is guided relative to the barrel (50) in the axial direction (112, 114). Additionally provided is a threaded part (122) whose thread (120) is in engagement with the thread (100) of the piston rod (98), which threaded part (122) is rotatable relative to the piston rod (98) and relative to the barrel (50) in order to set an injection dose, and in that context is axially displaced relative to the piston rod (98) and relative to the barrel (50), which threaded part (122) is also displaced in the injection direction relative to the barrel (50) during an injection operation, and in that context is prevented from rotating relative to the piston rod (98).

Appareil d'injection qui possède un boîtier (50) conçu pour recevoir un récipient (108) contenant un liquide à injecter (110), une tige (98) de piston pourvue d'un filetage (100) pour l'évacuation par pression de liquide à injecter (110) dudit récipient (108), la tige (98) de piston étant guidée (112, 114) dans le sens axial par rapport au boîtier (50). Ledit appareil possède en outre une partie filetée (122) dont le filetage (120) est engrené avec le filetage (100) de la tige (98) de piston. Ladite partie filetée (122) destinée au réglage d'une dose d'injection est rotative par rapport à la tige (98) de piston et au boîtier (50) et se déplace donc axialement par rapport à la tige (98) de piston et au boîtier (50). Pendant une procédure d'injection, ladite partie filetée est poussée par rapport au boîtier (50) dans le sens d'injection, une rotation par rapport à la tige (98) de piston étant empêchée pendant ladite procédure d'injection.

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