Liposomes

A - Human Necessities – 61 – K

Patent

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Details

A61K 49/00 (2006.01) A61K 49/04 (2006.01) A61K 49/18 (2006.01) A61K 49/22 (2006.01) A61K 51/12 (2006.01)

Patent

CA 2185810

The invention provides a diagnostic composition for administration to human or animal subjects the composition containing multilamellar liposomes, optionally together with unilamellar liposomes, the liposomes containing at least one imaging agent and being suspended in an aqueous medium containing said imaging agent, wherein the liposomes comprise a neutral phospholipid and a charged phospholipid, the average particle diameter of the liposomes is 50-3000 mm and the concentration of imaging agent in any aqueous phase filling the interior of the liposomes is substantially the same as that in the aqueous medium in which the liposomes are suspended. The contrast agents concerned are typically X-ray, MRI or ultrasound contrast agents.

L'invention concerne une composition de diagnostic destinée à être administrée à l'homme ou à l'animal, qui contient des liposomes multilamellaires ainsi qu'éventuellement des liposomes unilamellaires; les liposomes renferment au moins un agent de formation d'image, sont mis en suspension dans un milieu aqueux contenant ledit agent et comportent un phospholipide neutre ainsi qu'un phospholipide chargé; le diamètre moyen de particule des liposomes est compris entre 50 et 3000 nm et la concentration de l'agent de formation d'image dans toute phase aqueuse remplissant l'intérieur des liposomes est sensiblement la même que celle du milieu aqueux dans lequel les liposomes sont en suspension. Les agents de contraste concernés sont, de façon classique, ceux utilisés pour la radiologie, la résonance magnétique ou les ultrasons.

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