Gas driven drug delivery device

A - Human Necessities – 61 – M

Patent

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Details

A61M 5/168 (2006.01) A61M 5/145 (2006.01) A61M 5/142 (2006.01) A61M 5/158 (2006.01)

Patent

CA 2334174

A subcutaneous drug delivery device (10) comprises a housing having an internal reservoir (12) in communication with a drug delivery needle (21) via a fluid path (23). An expandable chamber (14) disposed adjacent to the reservoir (12) forces drug from the reservoir (12) to the needle (21) when supplied with a gas. A flow regulating chamber (24-26), in communication with the fluid path, is capable of volumetric changes in response to temperature and/or pressure changes. An increase in the volume of the flow regulating chamber (24-26) increases flow resistance to the needle (21) and thereby counteracts the corresponding increase in delivery rate resulting from the expansion of the expandable chamber (14) due to the same volumetric changes in response to temperature and/or pressure.

L'invention concerne un dispositif d'administration sous-cutanée (10) de médicament comprend un boîtier possédant un réservoir (12) en communication avec une aiguille (21) d'administration de médicament dans un passage de fluide (23). Une chambre expansible (14) placée en position adjacente au réservoir pousse le médicament du réservoir (12) dans l'aiguille (21) lorsqu'il est alimenté en gaz. Une chambre de régulation de débit (24-26), en communication avec le passage de fluide, présente des changements volumétriques en réponse à des changements de température et/ou de pression. Une augmentation du volume de la chambre de régulation (24-26) augmente la résistance d'écoulement dans l'aiguille (21) et agit à l'encontre de l'augmentation correspondante du débit d'administration résultant de l'expansion de la chambre expansible (14), consécutivement auxdits changements volumétriques, en réponse à la température et/ou la pression.

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