Closed Tip Dynamic Microvalve Protection Device

A device for temporary use in a vessel during an intravascular procedure, comprising:

• a) a flexible outer catheter having a proximal end and a distal end;
• b) an inner catheter having a proximal end and a distal end, and defining an infusion lumen extending between the proximal and distal ends which opens at a distal orifice, the inner catheter extending through and manually longitudinally displaceable relative to the outer catheter, an annular space defined between the inner and outer catheters;
• c) a first port in fluid communication with the infusion lumen;
• d) a second port in fluid communication with the annular space;
• and
• e) a filter valve coupled longitudinally and rotationally fixed adjacent the distal ends of both of the outer and inner catheters, the proximal end of the filter valve coupled to the distal end of the outer catheter, and the distal end of the filter valve coupled to the inner catheter adjacent the distal end of the inner catheter, such that longitudinal displacement of the inner catheter relative to the outer catheter moves the filter valve from a non-deployed configuration to a deployed configuration.

A treatment system configured for intravascular advancement to a target vessel, comprising:

• a) a device, including:
• i) a flexible outer catheter having a proximal end and a distal end,
• ii) an inner catheter having a proximal end and a distal end, and defining an infusion lumen extending between the proximal and distal ends which opens at a distal orifice, the inner catheter extending through and manually longitudinally displaceable relative to the outer catheter, and
• iii) a filter valve coupled adjacent the distal ends of both of the outer and inner catheters, a proximal end of the filter valve coupled to the distal end of the outer catheter, and a distal end of the filter valve coupled to the inner catheter adjacent the distal end of the inner catheter, such that distal longitudinal displacement of the inner catheter relative to the outer catheter moves the filter valve into a radially compressed, non-deployed configuration suitable for intravascular advancement;
• and
• b) a guidewire inserted within the infusion lumen and distally protruding through the distal end of the inner catheter.