Guidewire filter and methods of use

A - Human Necessities – 61 – F

Patent

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Details

A61F 2/01 (2006.01) A61M 25/09 (2006.01)

Patent

CA 2358706

A filter system for temporary placement of a filter in an artery or vein is disclosed. The filter system includes a guidewire that is first positioned across a lesion within a vessel. The guidewire may include a distal stop. A slideable filter is then advanced along the guidewire using an advancing mechanism, typically an elongate member slideable over the guidewire and contacting the filter. A capture sheath may be disposed about the filter during advancement. Once the filter is positioned downstream of the lesion, the capture sheath is withdrawn, allowing the filter to expand. Further distal advancement of the filter is prohibited by the stop. After expansion of the filter, the capture sheath and the advancing mechanism are withdrawn from the region of interest, and removed from the patient's vessel. The filter may then be retrieved using a capture sheath or exchanged for a second filter after removing the first filter.

L'invention concerne un système de filtre permettant de placer un filtre de manière temporaire dans une artère ou une veine. Ce système comprend un fil-guide qui est tout d'abord positionné à travers une lésion dans un vaisseau, ledit fil-guide pouvant comporter une butée distale. Un filtre coulissant est ensuite avancé le long du fil-guide au moyen d'un mécanisme d'avancement, en général un élément allongé pouvant coulisser sur le fil-guide et venant en contact avec le filtre. Une gaine de capture peut être disposée autour du filtre pendant l'avancement. Une fois le filtre positionné en aval de la lésion, la gaine de capture est retirée, permettant ainsi l'expansion du filtre. La butée empêche tout avancement distal supplémentaire du filtre. Après expansion du filtre, la gaine de capture et le mécanisme d'avancement sont retirés de la région concernée, puis du vaisseau du patient. Le filtre peut être récupéré au moyen d'une gaine de capture ou remplacé par un deuxième filtre après retrait du premier.

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