A - Human Necessities – 61 – B
Patent
A - Human Necessities
61
B
A61B 18/02 (2006.01)
Patent
CA 2413529
A medical device for cryotreatment of bodily regions is disclosed. The device comprises an inflatable support structure coupled to the distal end portion of a catheter shaft, the support structure being further enveloped by an expandable membrane to define an expansion chamber between the support structure and the membrane. An inflation lumen is coupled to the support structure to inject an inert, insulating fluid in the support structure, thereby expanding the support structure and the expandable membrane, wherein the resultant expansion chamber formed therebetween is substantially conical in shape. Refrigerant is injected into the expansion chamber, thereby creating localized cooling of tissues adjacent to the expansion chamber, the cooling region being substantially conical in shape. Alternately, a second inflatable support structure is provided inside of the expandable membrane and distal to the first support structure, to define an expansion chamber therebetween that is substantially toroidal in shape, thereby enabling the creation of circumferential cooling regions when refrigerant is injected into said expansion chamber.
L'invention porte sur un dispositif médical utilisé dans le traitement cryogénique de régions biologiques. Ce dispositif comprend une structure support gonflable couplée à la partie distale d'une tige de cathéter, cette structure de support étant ensuite enveloppée d'une membrane extensible de façon à former une chambre dilatable entre la structure de support et la membrane. Un lumen de gonflage est couplé à la structure de support de façon à injecter un fluide isolant, inerte, dans la structure de support, ce qui permet sa dilatation, ainsi que celle de la membrane. La chambre de dilatation obtenue a une forme sensiblement conique. Un réfrigérant est injecté dans la chambre de dilatation, ce qui crée un refroidissement localisé des tissus adjacents à la chambre de dilatation, la région de refroidissement ayant une forme sensiblement conique. En variante, une seconde structure de support gonflable est ménagée à l'intérieur de la membrane dilatable, et est distale par rapport à la première structure de support, afin de former une chambre de dilatation entre les deux structures de forme pratiquement toroïdale, ce qui permet de créer des régions de refroidissement circonférentielles lorsque le réfrigérant est injecté dans la chambre de dilatation.
Carroll Sean
Luckge Claudia
Wittenberger Dan
Carroll Sean
Cryocath Technologies Inc.
Medtronic Cryocath Lp
Ridout & Maybee Llp
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