Patent attributes
A method includes providing microvalve device having inner and outer catheters, and a filter valve attached to the distal end of the inner and outer catheters. Longitudinal displacement of the inner catheter relative to the outer catheter moves the filter valve from a non-deployed configuration to a deployed configuration. With the inner catheter longitudinally advanced a first amount relative to the outer catheter, the filter valve is in a reduced first diameter for advancement of a guidewire to a target location. Once the filter valve reaches the target location, the inner catheter is moved relative to the outer catheter such that the filter valve assumes a larger second diameter. A therapeutic agent is infused through the inner catheter and beyond the filter valve.
