Circumferential ablation device assembly and methods of use and manufacture providing an ablative circumferential band along an expandable member
First Claim
1. A tissue ablation device assembly, comprising:
- an elongate catheter body with a proximal end portion and a distal end portion;
an expandable member mounted along said distal end portion of said elongate catheter body and defining an interior chamber, said expandable member having an exterior surface adapted for engagement with a region of tissue when in an expanded condition, said expandable member being formed at least in part with a porous membrane;
first and second expansion elements coupled to said expandable member for expanding said expandable member;
an ablation element disposed within said interior chamber, said ablation element being shaped for emitting ablative energy through said expandable member for ablating at least a portion of the region of tissue; and
a fluid passageway extending through said elongate catheter body and communicating with said interior chamber, said fluid passageway being adapted to be fluidly coupled to a fluid source for delivering a volume of ablative medium from said fluid source to said interior chamber, wherein said ablative medium is allowed to pass through said porous membrane for ablatively coupling said ablation element to the region of tissue.
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Accused Products
Abstract
A medical balloon catheter assembly includes a balloon having a permeable region and a non-permeable region. The balloon is constructed at least in part from a fluid permeable tube such that the permeable region is formed from a porous material which allows a volume of pressurized fluid to pass from within a chamber formed by the balloon and into the permeable region sufficiently such that the fluid may be ablatively coupled to tissue engaged by the permeable region. The non-permeable region is adapted to substantially block the pressurized fluid from passing from within the chamber and outwardly from the balloon. The porous material may be a porous fluoropolymer, such as porous polytetrafluoroethylene, and the pores may be created by voids that are inherently formed between an interlocking node-fibril network that makes up the fluoropolymer. Such voids may be created according to one mode by expanding the fluoropolymer. The balloon may be formed such that the porous material extends along both the permeable and non-permeable regions. In one mode of this construction, the porous material is porous along the permeable region but is non-porous along the non-permeable region, such as for example by expanding only the permeable region in order to render sufficient voids in the node-fibril network to provide permeable pores in that section. The voids or pores in the porous material may also be provided along both permeable and non-permeable sections but are substantially blocked with an insulator material along the non-permeable section in order to prevent fluid from passing through. The insulator material may be dip coated, deposited, or extruded with the porous material in order to fill the voids. The insulator material may in one mode be provided along the entire working length of the balloon and then selectively removed along the permeable section, or may be selectively exposed to only the non-permeable sections in order to fill the voids or pores there.
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Citations
12 Claims
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1. A tissue ablation device assembly, comprising:
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an elongate catheter body with a proximal end portion and a distal end portion;
an expandable member mounted along said distal end portion of said elongate catheter body and defining an interior chamber, said expandable member having an exterior surface adapted for engagement with a region of tissue when in an expanded condition, said expandable member being formed at least in part with a porous membrane;
first and second expansion elements coupled to said expandable member for expanding said expandable member;
an ablation element disposed within said interior chamber, said ablation element being shaped for emitting ablative energy through said expandable member for ablating at least a portion of the region of tissue; and
a fluid passageway extending through said elongate catheter body and communicating with said interior chamber, said fluid passageway being adapted to be fluidly coupled to a fluid source for delivering a volume of ablative medium from said fluid source to said interior chamber, wherein said ablative medium is allowed to pass through said porous membrane for ablatively coupling said ablation element to the region of tissue. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A tissue ablation device assembly, comprising:
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an elongate catheter body with a proximal end portion and a distal end portion, said elongate catheter body defining a fluid passageway;
an expandable member mounted along said distal end portion of said elongate catheter body and defining an interior chamber in fluid communication with said fluid passageway, said expandable member being formed with a permeable band adapted for engagement with a region of tissue when in an expanded condition;
a first expansion element disposed at a proximal end of said expandable member;
a second expansion element disposed at a distal end of said expandable member; and
an ablation element disposed within said interior chamber of said expandable member between said first and second expansion elements;
wherein said first and second expansion elements are inflatable for increasing a diameter of said expandable member for engagement with the region of tissue and wherein an ablative medium is deliverable into said interior chamber and out through said permeable band for ablatively coupling said ablation element to the region of tissue.
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Specification