Improvements in or relating to contrast agents

A - Human Necessities – 61 – K

Patent

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Details

A61K 49/00 (2006.01) A61K 41/00 (2006.01) A61K 49/22 (2006.01)

Patent

CA 2329175

Ultrasonic visualisation of a subject, particularly of perfusion in the myocardium and other tissues, is performed using novel gas-containing contrast agent preparations which promote controllable and temporary growth of the gas phase in vivo following administration and can therefore act as deposited perfusion tracers. The preparations comprise an injectable aqueous medium comprising dispersed gas and an injectable oil-in-water emulsion in which the oil phase comprises a diffusible component capable of diffusion in vivo into the dispersed gas to promote temporary growth thereof, such that material present at the surfaces of the dispersed gas phase and material present at the surfaces of the dispersed oil phase have affinity for each other, e.g. as a result of having opposite charges. In cardiac perfusion imaging the preparations may advantageoulsy be coadministered with vasodilator drugs such as adenosine in order to enhance the differences between return signal intensity from normal and hypoperfused myocardial tissue respectively.

La présente invention concerne la visualisation ultrasonique, en particulier d'une perfusion dans le myocarde et autres tissus, au moyen de nouvelles préparations d'agent de contraste renfermant du gaz. Une fois injectées, ces préparations favorisent une croissance maîtrisée et temporaire de la phase gazeuse in vivo et peuvent donc jouer le rôle de marqueurs de perfusion déposés. Les préparations renferment un milieu aqueux injectable composé de gaz à l'état de dispersion et d'une émulsion huile dans eau injectable dans laquelle la phase huileuse comprend un agent pouvant se diffuser in vivo dans le gaz dispersé et favoriser la croissance momentanée dudit gaz, de sorte que la matière présente sur les surfaces de la phase gazeuse dispersée et la matière présente sur les surfaces de la phase huileuse dispersée aient une affinité mutuelle, notamment à cause de leurs charge opposée. En ce qui concerne la visualisation de perfusions cardiaques, les préparations peuvent être utilement co-administrées avec des vasodilatateurs de type adénosine, le but étant d'accentuer les différences d'intensité entre signaux de retour selon que le tissu myocardique est normal ou en état d'hypoperfusion.

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