An embolic material capture catheter comprising: an outer sheath defining an outer sheath lumen; an inner sheath slidably disposed in the outer sheath lumen and defining an inner sheath lumen; an embolic material capture element having a proximal end portion and a distal end portion, the proximal end portion being attached to a distal end portion of the inner sheath, the embolic material capture element having an insertion configuration, an intermediate deployment configuration, and a fully deployed configuration; the embolic material capture element being adapted to, in the fully deployed configuration, interface with an inner surface of a blood vessel; the embolic material capture element being adapted to block flow of embolic material through the blood vessel past the embolic material capture element; and a dilator assembly including a dilator sheath and a deployment cap assembly, the dilator sheath being slidably disposed in the inner sheath lumen and defining a dilator sheath lumen, the deployment cap assembly being slidably disposed in the dilator sheath lumen, wherein: a distal end portion of the embolic material capture element is restrained in the insertion configuration and the intermediate deployment configuration by the dilator assembly, a middle portion of the embolic material capture element expands radially from the insertion configuration to the intermediate deployment configuration via distal advancement of the inner sheath towards the distal end portion of the embolic material capture element restrained by the dilator assembly, the distal end portion of the embolic material capture element expands radially from the intermediate deployment configuration to the fully deployed configuration in response to release of the distal end portion of the embolic material capture element by the dilator assembly via distal advancement of the deployment cap assembly relative to the dilator sheath, and the dilator assembly is removable from the inner sheath lumen while the embolic material capture element is in the fully deployed configuration via proximal retraction of the dilator assembly relative to the inner sheath. an outer sheath defining an outer sheath lumen; an inner sheath slidably disposed in the outer sheath lumen and defining an inner sheath lumen; an embolic material capture element having a proximal end portion and a distal end portion, the proximal end portion being attached to a distal end portion of the inner sheath, the embolic material capture element having an insertion configuration, an intermediate deployment configuration, and a fully deployed configuration; the embolic material capture element being adapted to, in the fully deployed configuration, interface with an inner surface of a blood vessel; the embolic material capture element being adapted to block flow of embolic material through the blood vessel past the embolic material capture element; and a dilator assembly including a dilator sheath and a deployment cap assembly, the dilator sheath being slidably disposed in the inner sheath lumen and defining a dilator sheath lumen, the deployment cap assembly being slidably disposed in the dilator sheath lumen, wherein: a distal end portion of the embolic material capture element is restrained in the insertion configuration and the intermediate deployment configuration by the dilator assembly, a middle portion of the embolic material capture element expands radially from the insertion configuration to the intermediate deployment configuration via distal advancement of the inner sheath towards the distal end portion of the embolic material capture element restrained by the dilator assembly, the distal end portion of the embolic material capture element expands radially from the intermediate deployment configuration to the fully deployed configuration in response to release of the distal end portion of the embolic material capture element by the dilator assembly via distal advancement of the deployment cap assembly relative to the dilator sheath, and the dilator assembly is removable from the inner sheath lumen while the embolic material capture element is in the fully deployed configuration via proximal retraction of the dilator assembly relative to the inner sheath. a distal end portion of the embolic material capture element is restrained in the insertion configuration and the intermediate deployment configuration by the dilator assembly, a middle portion of the embolic material capture element expands radially from the insertion configuration to the intermediate deployment configuration via distal advancement of the inner sheath towards the distal end portion of the embolic material capture element restrained by the dilator assembly, the distal end portion of the embolic material capture element expands radially from the intermediate deployment configuration to the fully deployed configuration in response to release of the distal end portion of the embolic material capture element by the dilator assembly via distal advancement of the deployment cap assembly relative to the dilator sheath, and the dilator assembly is removable from the inner sheath lumen while the embolic material capture element is in the fully deployed configuration via proximal retraction of the dilator assembly relative to the inner sheath.