Methods for embolizing blood vessels

A - Human Necessities – 61 – L

Patent

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Details

A61L 24/00 (2006.01) A61B 17/12 (2006.01) A61K 31/74 (2006.01) A61K 33/24 (2006.01) A61L 17/00 (2006.01) A61L 24/02 (2006.01) A61L 24/04 (2006.01) A61L 31/02 (2006.01)

Patent

CA 2244418

Disclosed are methods useful for treating vascular lesions wherein a non- particulate agent such as a metal coil is introduced into a vascular site (e.g., an aneurysm cavity) in conjunction with an embolizing composition comprising a biocompatible polymer and a biocompatible solvent. The biocompatible solvent is miscible or soluble in blood and also solubilizes the polymer during delivery. The biocompatible polymer is selected to be soluble in the biocompatible solvent but insoluble in blood. Upon contact with the blood, the biocompatible solvent dissipates from the embolic composition whereupon the biocompatible polymer precipitates. Precipitation of the polymer in the presence of the non-particulate agent permits the agent to act as a structural lattice for the growing polymer precipitate. In another embodiment, the biocompatible polymer composition can be replaced with a biocompatible prepolymer composition containing a biocompatible prepolymer.

L'invention porte sur des procédés de traitement de lésions vasculaires consistant à introduire dans le site vasculaire (par exemple la cavité d'un anévrisme) un agent non particulaire tel qu'un vrille métallique ainsi qu'une composition embolisante faite d'un polymère et d'un solvant biocompatibles. Ledit solvant, miscible ou soluble dans le sang, dissout le polymère pendant l'administration, par contre ledit polymère est choisi pour être soluble dans le solvant, mais non dans le sang. En entrant en contact avec le sang, le solvant s'échappe de la composition embolisante, entraînant ainsi la précipitation du polymère. Cette précipitation en présence de l'agent non particulaire permet à ce dernier de jouer un rôle de treillis support du polymère précipité grossissant. Dans une variante, la composition de polymère biocompatible peut être remplacée par une composition à base d'un prépolymère biocompatible.

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