Blood filter devices and methods of use is describe herein. Present invention pertains to a method of filtering and capturing particles in a vasculature of a patient that comprises steps of introducing a delivery device, which has a filter assembly placed therein, through a first vessel. The filter assembly comprises a first filter portion and second filter portion that open and closes with respect to each other via a pivot axis extending perpendicular to a longitudinal axis of delivery catheter. Upon deployment of the filter assembly the first filter portion is positioned relative to the first vessel such that particles traveling into the first vessel will be trapped in the first filter portion, and positioning the second filter portion relative to the second vessel such that particles traveling into the second vessel will be trapped in the second filter portion. After capturing the particles in the respective filters, first and second filter portions pivot towards one another to close the filter assembly in order to be retrieved back into the delivery device for removal from the vasculature of the patient.
