A coaxial filtering device (10) for removing particles from arteries and veinscomprises an outer catheter (14) that can be inserted into a blood vessel, andan inner catheter (17) with a filter at its distal end. The filter (13) is aradially expandable receptacle made of an elastic mesh structure of springwires or plastic mono-filaments. The filter (13) expands into engagement withthe walls of the blood vessel when it is pushed from the distal end of theouter catheter. A syringe (22) is attached to the proximal end (19) of theinner catheter (17), and particles entrapped within the filter (13) areaspirated through the inner catheter (17) into the syringe (22). Whenfiltering is no longer necessary, the filter (13) can easily be removed bypulling the elastic material through the outer catheter (14).
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