Microcoil vaso-occlusive device with multi-axis secondary...

A - Human Necessities – 61 – B

Patent

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Details

A61B 17/12 (2006.01) A61B 17/00 (2006.01)

Patent

CA 2498192

A vaso-occlusive device includes a microcoil formed into a secondary configuration comprising a plurality of curved segments, each defining a discrete axis. The secondary configuration may comprise a plurality of interconnected closed loops or laterally-alternating open loops, defining a plurality of discrete axes. Alternatively, the secondary configuration may form a series of closed loops, wherein the entire structure subtends a first angle, and wherein each adjacent pair of loops defines a second angle; or the secondary configuration may form a logarithmic spiral. The device, in its secondary configuration, has a dimension that is larger than the largest dimension of the aneurysm in which it is to be deployed. Thus, confinement of the device within an aneurysm causes it to assume a configuration with a higher energy state than the minimum energy state of the secondary configuration. Because the minimum energy state configuration is larger (in at least one dimension) than the aneurysm, the deployed device is constrained by the aneurysm from returning to its minimum energy state configuration, and the containment of the device minimizes its shifting due to blood flow.

Dispositif vaso-occlusif comprenant un micro-enroulement selon une configuration secondaire, qui comprend une pluralité de segments incurvés définissant chacun un axe séparé. La configuration secondaire peut comporter une pluralité de boucles fermées ou de boucles ouvertes alternées latéralement définissant une pluralité d'axes séparés. En variante, la configuration secondaire peut former soit une série de boucles fermées dans laquelle la structure tout entière sous-tend un premier angle et chaque paire adjacente de boucles définit un second angle; soit une spirale logarithmique. Dans sa seconde configuration secondaire, le dispositif présente une cote qui est plus importante que la dimension la plus grande de l'anévrisme dans lequel il doit être déployé. Ainsi, le confinement du dispositif dans un anévrisme le force à prendre une configuration dans un état d'énergie plus important que celui de la configuration secondaire. Comme la configuration à état d'énergie minimum est plus importante (au moins pour ce qui est d'une cote) que l'anévrisme, le dispositif ne peut pas repasser en configuration d'état d'énergie minimum et changer d'état par suite de l'écoulement sanguin.

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