System and method for forming a substantially non-ablative...

A - Human Necessities – 61 – M

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A61M 31/00 (2006.01) A61M 25/00 (2006.01) A61K 35/12 (2006.01) A61M 25/10 (2006.01) C12N 5/06 (2006.01)

Patent

CA 2487280

A system forms a conduction block in a region of cardiac tissue at a location associated with a cardiac arrhythmia by delivering a material that is non- ablative into the region. The material includes living cells that do not form sufficient gap-junctions with cardiomyocytes to conduct, e.g. myoblasts, stem cells, or fibroblasts. The material may be a non-living agent, such as a polymer agent, e.g. fibrin glue agent or collagen agent. The material may be a combination of living and non-living material that enhances the cellular conduction block. A contact member (20, 420) delivers the material over a patterned region of tissue, such as arcuate, linear, or circumferential patterns. The contact member (20,420) may include an expandable member or balloon (430). A guidewire (480) may be used for delivery. Cells used may be autologous, prepared for injection with a kit. Conduction blocks are thus formed without substantially ablating cardiac tissue in the region.

L'invention concerne un système formant un bloc de conduction dans une région de tissus cardiaques au niveau d'un emplacement associé à une arythmie cardiaque par distribution d'un matériau non ablatif dans ladite région. Ce matériau comprend des cellules vivantes qui ne forment pas de jonctions lacunaires suffisantes avec des cardiomyocytes pour conduire, par exemple, des myoblastes, des cellules souches, ou des fibroblastes. Ledit matériau peut être un agent non vivant, de type polymère, par exemple de la colle de fibrine ou du collagène. Ledit matériau peut être une combinaison d'un matériau vivant et d'un matériau non vivant qui permet d'améliorer le bloc de conduction cellulaire. Un élément de contact (20, 420) distribue ledit matériau sur une région de tissus présentant un motif, de type arqué, linéaire ou circonférentiel. Ledit élément de contact (20, 420) peut comprendre un élément gonflable ou ballon (430). Un fil guide (480) peut servir à assurer la distribution. Les cellules utilisées peuvent être autologues, et préparées pour une injection au moyen d'un kit. Ainsi, les blocs de conduction sont formés sans pratiquer sensiblement l'ablation de tissus cardiaques dans ladite région.

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