Use of hollow microcapsules

A - Human Necessities – 61 – K

Patent

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Details

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

Patent

CA 2251937

A method of obtaining an image of a part of a patient, comprising: (a) providing microcapsules which have been formed by (i) providing a solution of a material in an aqueous solvent containing water and a liquid of greater volatility than water and (ii) spraying the said solution into a gas such that the aqueous solvent evaporates, thereby forming hallow microcapsules suitable for use as an echogenic contrast agent, (b) injecting the microcapsules into a patient, and (c) subjecting the patient to ultrasonic energy to obtain an image based on the ultrasound reflectivity transmissibility or resonance of the microcapsules, characterised in that at least 5 minutes elapse between steps (b) and (c). The patient can be exercised between administration and imaging without having to be reinjected.

Selon une méthode permettant d'obtenir une image chez un patient, (a) on prend des microcapsules que l'on a formées i) en constituant une solution d'un matériau dans un solvant aqueux contenant de l'eau et un liquide ayant une volatilité supérieure à celle de l'eau et ii) en vaporisant ladite solution de façon à former un gaz et à faire évaporer le solvant aqueux, ce qui forme des microcapsules creuses convenant comme agent de contraste échogène; (b) on injecte les microcapsules chez un patient; et (c) on soumet le patient à une énergie ultrasonore afin d'obtenir une image fondée sur le facteur de transmission de la réflectivité des ultrasons ou la résonance des microcapsules. La méthode est caractérisée par le fait qu'au moins 5 minutes séparent les étapes (b) et (c). Le patient peut être soumis à des épreuves d'effort entre l'administration et l'imagerie sans qu'il soit nécessaire de lui refaire une injection.

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