outer tubular member to permit passage of gas but inhibit the passage of liquids the aspiration baffle is used in a catheter having a balloon or other inflatable structure to assist in priming of the structure after evacuating the inflatable structure by applying a vacuum the aspiration baffle can collect and trap residual gas which remains during the priming of the inflatable structure application_number US 32589606 A description an aspiration baffle 10 constructed in accordance with the principles of the present invention comprises an outer tubular member 12 and optionally an inner core wire 14 fig1 and 2 a plurality of microholes 16 are formed in the wall of the outer tubular member 12 thus defining passages from a region exterior to the aspiration baffle to an annular region 17 defined between an exterior surface of the core wire 14 and an interior surface of the outer tubular member 12 fig2 core wire 14 is attached to the outer tubular member for example by a polymeric plug 21 formed in a distal end 18 of the tubular member a similar or alternative plug 23 is also provided at the proximal end 19 of the tubular member 12 thus the outer tubular member.