An apparatus comprising: an outer catheter extending from a proximal end to a distal end; a first shaft extending through the catheter from the proximal end to the distal end and being configured and arranged to move within the outer catheter, the first shaft having an end portion configured and arranged to retract within the proximal end; a second shaft extending through the outer catheter, the second shaft being configured and arranged to move relative to the first shaft and having an end portion that extends beyond the end portion of the first shaft, at least a portion of the second shaft being configured and arranged to retract into the outer catheter; and a filter having a filter mesh with openings configured and arranged to pass fluid and to mitigate the passage of particles in the fluid and having a dimension larger than the openings, and having a perimeter structure that is connected to the second shaft and to a perimeter of the filter mesh, the filter being configured and arranged with the first and second shafts (130, 140) to expand to a first state by causing portions of the perimeter structure at edges of the filter and on opposite sides of the shaft, to spread apart from one another in response to a portion of the second shaft being in a first position relative to the first shaft, the filter having a dimension in the first state that is wider than a cross-sectional area of the outer catheter, and the filter mesh having a surface area portion in the first state that is configured and arranged to cover an opening in a sidewall of vascular tissue with the filter mesh and perimeter structure sealed around the opening, with the filter mesh covering the opening and conformed to portions of the sidewall around the opening, therein preventing the passage of material larger than the size of pores of filter mesh into the opening, and collapse to a second state in response to the second shaft being manipulated to a second position in which the portion of the second shaft is manipulated relative to the first shaft, the filter and outer catheter being configured and arranged to facilitate retraction of the filter into the outer catheter in the second state. an outer catheter extending from a proximal end to a distal end; a first shaft extending through the catheter from the proximal end to the distal end and being configured and arranged to move within the outer catheter, the first shaft having an end portion configured and arranged to retract within the proximal end; a second shaft extending through the outer catheter, the second shaft being configured and arranged to move relative to the first shaft and having an end portion that extends beyond the end portion of the first shaft, at least a portion of the second shaft being configured and arranged to retract into the outer catheter; and a filter having a filter mesh with openings configured and arranged to pass fluid and to mitigate the passage of particles in the fluid and having a dimension larger than the openings, and having a perimeter structure that is connected to the second shaft and to a perimeter of the filter mesh, the filter being configured and arranged with the first and second shafts (130, 140) to expand to a first state by causing portions of the perimeter structure at edges of the filter and on opposite sides of the shaft, to spread apart from one another in response to a portion of the second shaft being in a first position relative to the first shaft, the filter having a dimension in the first state that is wider than a cross-sectional area of the outer catheter, and the filter mesh having a surface area portion in the first state that is configured and arranged to cover an opening in a sidewall of vascular tissue with the filter mesh and perimeter structure sealed around the opening, with the filter mesh covering the opening and conformed to portions of the sidewall around the opening, therein preventing the passage of material larger than the size of pores of filter mesh into the opening, and collapse to a second state in response to the second shaft being manipulated to a second position in which the portion of the second shaft is manipulated relative to the first shaft, the filter and outer catheter being configured and arranged to facilitate retraction of the filter into the outer catheter in the second state.