Injection device

A - Human Necessities – 61 – M

Patent

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Details

A61M 5/20 (2006.01) A61M 5/30 (2006.01)

Patent

CA 2554100

An injection device comprising an outer housing inside which is located a medicament-holding barrel (9) with a needle (10) at one end thereof, at least part of the needle being moveable in and out of the outer housing, a plunger (8) moveable within the barrel, an inner housing (7) intermediate the outer housing (6) and the barrel and plunger and an energy source (1) in communication with said inner housing. The inner housing is moveable by the energy source between a first position in which the plunger and barrel are movable axially so as to move at least part of said needle out of the outer housing; a second position in which the plunger is movable axially into said barrel so as to expel medicament through the needle; and a third position in which the plunger and barrel are able to retract in order to retract the needle into the outer housing.

L'invention concerne un dispositif d'injection comprenant un logement externe à l'intérieur duquel est placé un cylindre (9) contenant un médicament muni d'une aiguille (10) à une extrémité, un piston (8) pouvant se déplacer à l'intérieur du cylindre, un logement interne (7) intercalé entre le logement externe (6) et le cylindre avec le piston, et une source d'énergie (1) en communication avec ledit logement interne. Le logement interne peut être déplacé par la source d'énergie entre une première position dans laquelle le piston et le cylindre peuvent se déplacer axialement de manière qu'ils déplacent au moins une partie de l'aiguille hors du logement externe, une seconde position dans laquelle le piston peut se déplacer axialement à l'intérieur du cylindre de manière qu'il éjecte le médicament à travers l'aiguille, et une troisième position dans laquelle le piston et le cylindre peuvent se rétracter afin de rétracter l'aiguille à l'intérieur du logement externe.

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